Patent application number | Description | Published |
20090002612 | Liquid Crystal Display Panel and Fabrication Method For Liquid Crystal Display Panel - The present invention relates to a liquid crystal display panel and a fabrication method for a liquid crystal display apparatus and makes it possible to assure high productivity when compared with related art apparatus and methods and assure sufficient anchoring strength and picture quality. In the present invention, the shape of a face on which an orientation film | 01-01-2009 |
20090009703 | LIQUID CRYSTAL DISPLAY AND METHOD OF MANUFACTURING THE SAME - Disclosed herein is a liquid crystal display including substrates, a liquid crystal, an orientation layer, and electrodes. The orientation layer includes a base layer having a principal surface provided with a plurality of grooves in parallel, and a coating film covering the principal surface. The coating film has a horizontally orienting ability to orient in parallel the molecular major axes of the liquid crystal molecules in the condition where no voltage is impressed on the principal surface. The grooves each extend along a predetermined direction, and are arrayed repeatedly at a given pitch along the direction orthogonal to the predetermined direction. | 01-08-2009 |
20100188365 | Display apparatus and information input apparatus - A display apparatus includes a display panel including a first substrate, a second substrate opposed to the first substrate, and a touch sensor switch disposed in a display area that displays an image. The touch sensor switch includes a first touch electrode provided on a surface of the first substrate and a second touch electrode provided on a surface of the second substrate. The touch sensor switch has a structure in which the first and second touch electrodes are brought into contact when the display panel is deformed by an external pressure. The first substrate includes a convex portion that protrudes in a convex shape toward the second substrate. The convex portion has a top surface opposed to the second substrate and includes a flat area formed on the top surface. The first touch electrode is formed in the flat area on the convex portion as an isolated pattern. | 07-29-2010 |
20100194704 | DISPLAY DEVICE, TOUCH SENSOR, AND METHOD FOR MANUFACTURING DISPLAY DEVICE - Disclosed herein is a display device including: a display panel configured to display an image in a display area and have a substrate over which a protruding elastic member and an electrode provided on the elastic member are formed in the display area; wherein a plurality of steps are provided in the elastic member in a direction perpendicular to a surface of the substrate, and the electrode is so provided on the elastic member as to include part covering a surface of the plurality of steps. | 08-05-2010 |
20100194709 | LIQUID CRYSTAL DISPLAY DEVICE, MANUFACTURING METHOD OF LIQUID CRYSTAL DISPLAY DEVICE, DISPLAY DEVICE AND INFORMATION INPUT APPARATUS - A display device includes: a display panel including first and second substrates spaced from and opposite to each other, and has a touch sensor switch. The touch sensor switch includes a first touch electrode provided on a surface of the first substrate facing the second substrate, and a second touch electrode provided on a surface of the second substrate facing the first substrate and spaced from and faces the first touch electrode. The first and second touch electrodes contact with each other when the touch panel is deformed by an external pressure. The first touch electrode covers a surface of a concave and convex area where grooves are formed to be spaced from each other, and on the surface on which the first touch electrode is provided, an application film is provided to expose a surface of a top face of a convex part of the concave and convex area. | 08-05-2010 |
20120154736 | PIXEL ARRAY SUBSTRATE STRUCTURE, METHOD OF MANUFACTURING PIXEL ARRAY SUBSTRATE STRUCTURE, DISPLAY DEVICE, AND ELECTRONIC APPARATUS - A pixel array substrate structure includes: first and second planarizing films sequentially stacked on a substrate where a circuit unit is formed; and a relay wire formed between the first and second planarizing films, in which the relay wire electrically connects a first contact portion formed on the first planarizing film and connected to the circuit unit with a second contact portion formed at a position different from the first contact portion when seen from above, on the second planarizing film. | 06-21-2012 |
20120162594 | PIXEL STRUCTURE, DISPLAY DEVICE, AND ELECTRONIC APPARATUS - A pixel structure includes: a first planarizing film and a second planarizing film laminated in order on a substrate on which a circuit section is formed; and metallic wiring for electrically connecting two electrodes disposed on the second planarizing film to each other so as to be separated from each other, the metallic wiring being formed between the first planarizing film and the second planarizing film. | 06-28-2012 |
20120249931 | DISPLAY AND ELECTRONIC UNIT - A display capable of obtaining high contrast and an electronic unit including the display are provided. The display includes: a liquid crystal display panel including a liquid crystal layer and a light reflective layer; and an optical laminate disposed on the liquid crystal display panel, in which the optical laminate includes a first retardation layer, a light diffuser layer, a second retardation layer, and a polarization layer in order from a side closer to the liquid crystal display panel, the first retardation layer is a negative C-plate, and the second retardation layer is a λ/4 plate or a combination of a λ/4 plate and a λ/2 plate arranged in order from a side closer to the liquid crystal display panel. | 10-04-2012 |
20120250158 | DISPLAY AND ELECTRONIC UNIT - A display capable of obtaining high luminance in white display and an electronic unit are provided. The display includes: a reflective display panel; and an optical laminate disposed on the display panel, in which the optical laminate includes a plurality of anisotropic scattering films, and transmittances in a scattering central axis direction of two or more films of the plurality of anisotropic scattering films are different from each other. | 10-04-2012 |
20120274679 | DISPLAY APPARATUS - A display apparatus includes a display section including an array of pixels in a two-dimensional matrix, wherein each of the pixels of the display section includes a pair of a subpixel displaying a first primary color, and a subpixel displaying a second primary color being different from the first primary color. | 11-01-2012 |
20120313906 | SEMI-TRANSMISSIVE DISPLAY APPARATUS, METHOD FOR DRIVING SEMI-TRANSMISSIVE DISPLAY APPARATUS, AND ELECTRONIC SYSTEM - A semi-transmissive display apparatus includes: a reflective electrode provided for each pixel, wherein the semi-transmissive display apparatus performs reflective display operation by using the reflective electrodes and transmissive display operation by using spaces between the reflective electrodes of the pixels. | 12-13-2012 |
20120320012 | DISPLAY DEVICE AND ELECTRONIC APPARATUS - A display device includes: a liquid crystal layer driven based on an image signal; a reflection layer reflecting ambient light to the liquid crystal layer, in which the ambient light enters the reflection layer through the liquid crystal layer; a retardation layer provided on a side of the liquid crystal layer from which the ambient light enters; a polarizer provided on the side of the liquid crystal layer from which the ambient light enters; and a modulation layer varying a color tone of image light depending on illuminance of the ambient light. The image light is reflected from the reflection layer and is emitted to outside through the liquid crystal layer, the retardation layer, and the polarizer. | 12-20-2012 |
20120320025 | DISPLAY DEVICE AND ELECTRONIC APPARATUS - A display device includes: a liquid crystal display panel; and a driver circuit that drives the liquid crystal display panel. The liquid crystal display panel includes a liquid crystal layer, pixel electrodes provided in a region facing the liquid crystal layer and which apply a voltage thereto, and a phase difference layer and a polarizing plate each provided on a side, relative to the liquid crystal layer, which ambient light enters. Each of the pixel electrodes includes a plurality of partial electrodes, and the driver circuit selects one or more partial electrodes from the partial electrodes to which a constant voltage is to be applied in accordance with an image signal. The constant voltage causes the liquid crystal display panel to be in a white state. The driver circuit performs gray-scale display by modulating lighting area of each pixel at a frame rate of less than 60 Hz. | 12-20-2012 |
20130222439 | IMAGE DISPLAY APPARATUS, METHOD OF DRIVING IMAGE DISPLAY APPARATUS, GRAYSCALE CONVERSION PROGRAM, AND GRAYSCALE CONVERSION APPARATUS - An image display apparatus includes: a grayscale conversion device configured to perform grayscale conversion processing on input data to output data; and a display device configured to operate in accordance with the output data to display an image by pixels arranged in a two-dimensional matrix state, wherein the grayscale conversion device is configured to perform first error diffusion processing for converting N | 08-29-2013 |
20130229603 | DISPLAY DEVICE AND ANISOTROPIC SCATTERER - An anisotropic scatterer is configured to allow a scattering characteristic of light in a display region of a display device to have an angle dependence, and is configured to change the scattering characteristic of the light continuously in an in-plane direction. | 09-05-2013 |
20130235060 | DISPLAY APPARATUS AND ELECTRONIC APPARATUS - A display apparatus includes: a plurality of sub pixels that are included in a single pixel, that respectively perform a predetermined display based on a voltage which is supplied using a first electrode and a second electrode and display colors which are different from each other, wherein the plurality of sub pixels include areas which are different from each other, and respectively include pixels which have memory properties. | 09-12-2013 |
20130235301 | LIQUID CRYSTAL DISPLAY - A liquid crystal display which is a reflective liquid crystal display includes: a front substrate; a rear substrate; and a liquid crystal material layer disposed between the front substrate and the rear substrate, wherein an optical design is performed such that an extreme value of a liquid crystal applied voltage-reflectance curve in a state of being observed from a normal observing direction is shifted further to a lower voltage side than an extreme value of a liquid crystal applied voltage-reflectance curve in a state of being observed from a direction deviated from the normal observing direction, and wherein an anisotropic scatterer disposed such that a direction where scattering characteristics are the maximum is aligned with the normal observing direction is provided on the front substrate side. | 09-12-2013 |
Patent application number | Description | Published |
20140248072 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a support member disposed to support a nip formation member on an inner peripheral surface of a fixing belt. The support member includes a parallel portion that supports the nip formation member and extends parallel to a sheet transport direction in a nip portion, and a rise portion that extends from the parallel portion in a direction drawn apart from the nip portion. The rise portion is inclined to the parallel portion such that an inclination direction of the rise portion is substantially parallel to a virtual straight line connecting a center of rotation of the fixing belt and an inlet point of the nip portion or falls within a range of rotational angles of ±15° by which the virtual straight line is rotated around the center of rotation of the fixing belt. | 09-04-2014 |
20140270831 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus includes a fixing device including a fixing rotary body and a heater for heating the fixing rotary body. An opposed body contacts the fixing rotary body with releasable pressure therebetween to form a fixing nip therebetween through which a recording medium is conveyed. A heat shield is interposed between the heater and the fixing rotary body and movable in a circumferential direction of the fixing rotary body to shield the fixing rotary body from the heater in a variable circumferential direct heating span of the fixing rotary body where the heater is disposed opposite the fixing rotary body directly. A controller halts the heat shield instantly when a fault occurs during a print job. | 09-18-2014 |
20140270832 | FIXING DEVICE, IMAGE FORMING APPARATUS, AND FIXING METHOD - A fixing device includes a fixing rotary body rotatable in a predetermined direction of rotation and a heater disposed opposite and heating the fixing rotary body. An opposed body contacts the fixing rotary body with releasable pressure therebetween to form a fixing nip therebetween through which a recording medium is conveyed. A heat shield is interposed between the heater and the fixing rotary body and movable in a circumferential direction of the fixing rotary body between a home position where the heat shield is disposed opposite the heater indirectly and a shield position where the heat shield is disposed opposite the heater directly to shield the fixing rotary body from the heater. A controller is operatively connected to the heat shield to move the heat shield to the home position when a print job is finished. | 09-18-2014 |
20140270833 | FIXING DEVICE, IMAGE FORMING APPARATUS, AND FIXING METHOD - A fixing device includes a fixing rotary body and a heater for heating the fixing rotary body. An opposed body contacts the fixing rotary body with releasable pressure therebetween to form a fixing nip therebetween through which a recording medium is conveyed. A heat shield is interposed between the heater and the fixing rotary body and movable in a circumferential direction of the fixing rotary body to shield the fixing rotary body from the heater in a variable circumferential direct heating span of the fixing rotary body where the heater is disposed opposite the fixing rotary body directly. A controller is operatively connected to the heater and the heat shield to move the heat shield after the controller turns on the heater as a print job starts so as to change an area of the direct heating span of the fixing rotary body. | 09-18-2014 |
20140270875 | PRESSURE ADJUSTER, FIXING DEVICE, AND IMAGE FORMING APPARATUS - A pressure adjuster for changing pressure between a plurality of opposed bodies pressed against each other includes a cam rotatable in a given direction of rotation and having a top dead center on an outer circumferential surface thereof that is distanced farthest from a rotation axis of the cam. A driver is connected to the cam to drive and rotate the cam. A cam rest contacts the cam and is connected to one of the plurality of opposed bodies. A cam regulation assembly is connected to the cam to regulate rotation of the cam at least when the top dead center of the cam passes a contact position where the cam contacts the cam rest. | 09-18-2014 |
20140341623 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a fixing rotator rotatable in a predetermined direction of rotation, a heater disposed opposite the fixing rotator to heat the fixing rotator, and an opposed rotator contacting an outer circumferential surface of the fixing rotator. A heat shield interposed between the heater and the fixing rotator shields the fixing rotator from the heater. A support supports the heat shield. The heat shield includes a first section supported by the support and having a decreased thermal conductivity and a second section abutting the first section in an axial direction of the heat shield and having an increased thermal conductivity greater than the decreased thermal conductivity of the first section. | 11-20-2014 |
20140341624 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a fixing rotary body and a heater disposed opposite and heating the fixing rotary body. A nip formation assembly presses against an opposed body via the fixing rotary body to form a fixing nip between the fixing rotary body and the opposed body, through which a recording medium is conveyed. A movable heat shield movable in a circumferential direction of the fixing rotary body is interposed between the heater and the fixing rotary body to shield the fixing rotary body from the heater in a variable axial span of the fixing rotary body. A stationary heat shield, interposed between the heater and the fixing rotary body to shield the fixing rotary body from the heater, is disposed outboard from a lateral edge of a heat generator of the heater in an axial direction of the fixing rotary body. | 11-20-2014 |
20140341625 | FIXING DEVICE, IMAGE FORMING APPARATUS, AND FIXING METHOD - A fixing device includes a fixing rotator heated by a heater and a pressing rotator pressed against the fixing rotator to form a fixing nip therebetween, through which a recording medium bearing a toner image is conveyed. A heat shield interposed between the heater and the fixing rotator is movable in a circumferential direction of the fixing rotator to shield the fixing rotator from the heater in a variable axial shield span of the fixing rotator. The fixing rotator performs fixing rotation to convey the recording medium through the fixing nip while heating the recording medium and supplemental rotation other than fixing rotation. The heat shield moves to a decreased shield span position where the heat shield shields the fixing rotator from the heater in a decreased axial shield span of the fixing rotator during supplemental rotation thereof. | 11-20-2014 |
20140341626 | FIXING DEVICE, IMAGE FORMING APPARATUS, AND FIXING METHOD - A fixing device includes a fixing rotator heated by a heater and a pressing rotator to press against the fixing rotator to form a fixing nip therebetween. A heating span adjuster, interposed between the heater and the fixing rotator, is movable in a circumferential direction of the fixing rotator. The heating span adjuster moves to a retracted position where the heating span adjuster allows the heater to heat the fixing rotator in an increased axial heating span of the fixing rotator after the heater starts heating the fixing rotator until the fixing rotator and the pressing rotator start conveying the recording medium through the fixing nip. The heating span adjuster at the retracted position is outboard from a circumferential, direct heating span of the fixing rotator where the heater heats the fixing rotator directly. | 11-20-2014 |
20140341627 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a fixing rotator rotatable in a predetermined direction of rotation and a nip formation assembly contacting an inner circumferential surface of the fixing rotator. An opposed rotator presses against the nip formation assembly via the fixing rotator to form a fixing nip between the fixing rotator and the opposed rotator, through which a recording medium is conveyed. A support, disposed opposite the inner circumferential surface of the fixing rotator, supports the nip formation assembly. A heater, disposed opposite the inner circumferential surface of the fixing rotator, heats the fixing rotator. A reflector, disposed opposite an outer circumferential surface of the fixing rotator, reflects heat radiated from the fixing rotator onto the fixing rotator. The reflector spans a circumferential span of the fixing rotator where the fixing rotator is spaced apart from the support with a decreased interval therebetween. | 11-20-2014 |
20140356036 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a first heat generator and a second heat generator that heat a fixing rotator. A support is disposed inside the fixing rotator. A reflector is mounted on the support and interposed between the support and each of the first heat generator and the second heat generator to reflect light radiated from the first heat generator and the second heat generator toward the fixing rotator. The reflector includes a body mounted on the support and a shield portion projecting from the body toward the first heat generator and the second heat generator to shield the fixing rotator from the first heat generator and the second heat generator. The shield portion includes a wing disposed opposite a non-conveyance span of the fixing rotator in the axial direction thereof where a recording medium is not conveyed over the fixing rotator. | 12-04-2014 |
20140356037 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a fixing rotator, a first heat generator and a second heat generator that heat the fixing rotator, and a support disposed inside the fixing rotator. A reflector, interposed between the support and each of the first heat generator and the second heat generator, reflects light radiated from the first heat generator and the second heat generator toward the fixing rotator. The reflector includes a body mounted on the support and a shield portion projecting from the body toward the first heat generator and the second heat generator to shield the fixing rotator from the first heat generator and the second heat generator. An electric circuit is connected to the first heat generator and the second heat generator. A heat generation restrainer is provided in the electric circuit to restrict heat generation in the electric circuit. | 12-04-2014 |
20140356038 | FIXING DEVICE AND IMAGE FORMING APPARATUS INCLUDING SAME - A fixing device includes an endless belt or a fixing belt; a pressure member to contact an outer circumferential surface of the fixing belt; a nip forming member disposed at an interior side of the fixing belt and contacting the pressure member via the fixing belt; a heat source disposed at an interior side of the fixing belt to heat the fixing belt with radiant heat, a plurality of shielding members disposed between the heat source and the fixing belt and movable between a shielding position where the shielding member shields a non-sheet passing area on the fixing belt from the radiant heat from the heat source and a retracted position; and a controller to move the plurality of shielding members between the shielding position and the retracted position at a predetermined time. | 12-04-2014 |
Patent application number | Description | Published |
20110211876 | FIXING DEVICE AND IMAGE FORMING APPARATUS INCORPORATING SAME - A fixing device includes a flexible, endless belt-shaped fixing member that rotates in a predetermined direction of rotation, a substantially cylindrical metal heat conductor provided inside a loop formed by the fixing member and facing an inner circumferential surface of the fixing member, a pressing member that presses the fixing member against the metal heat conductor to form a nip between the fixing member and the pressing member through which a recording medium bearing a toner image passes, and a separator that presses the fixing member against the metal heat conductor, provided downstream from the nip in the direction of rotation of the fixing member and contacting the recording medium discharged from the nip to separate the recording medium from the fixing member and guide the recording medium out of the fixing device. | 09-01-2011 |
20110229200 | IMAGE FORMING APPARATUS INCLUDING REMOVABLE FIXING DEVICE - An image forming apparatus includes a fixing device, temperature detector, and a support member. The fixing device is removably installable in the image forming apparatus and includes a rotary fixing member to fuse a toner image on a recording medium, a fixing frame to support the fixing member, and an outer fixing cover provided to cover the fixing member and the fixing frame and having an opening from which a portion of a surface of the fixing member is exposed to the outside. The temperature detector is disposed opposing the fixing member to detect a temperature of the surface of the fixing member without contacting the fixing member when the fixing member is installed in the image forming apparatus. The support member supports the temperature detector to introduce the temperature detector into the inside of the fixing cover through the opening upon installation of the fixing member. | 09-22-2011 |
20120008153 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image forming unit to form a color toner image using a color toner and a transparent layer using a transparent toner on a sheet of recording media, a sheet conveyance unit to transport the sheet, a 3D display lens forming unit disposed downstream from the image forming unit in a sheet conveyance direction, and a controller. The 3D display lens forming unit includes a shaping member including an uneven portion having predetermined surface unevenness, and a pressure member to press the shaping member against the sheet, forming a shaping nip between the shaping member and the pressure member. The 3D display lens forming unit shapes the transparent layer that is an outermost layer on the sheet into a stereoscopic display lens by transferring the surface unevenness of the uneven portion of the shaping member to the transparent layer formed on the sheet. | 01-12-2012 |
20120219312 | FIXING DEVICE AND IMAGE FORMING APPARATUS INCORPORATING SAME - A fixing device includes a fixing rotary body rotatable in a predetermined direction of rotation to radiate infrared rays; a pressing rotary body, rotatable in a direction counter to the direction of rotation of the fixing rotary body, pressed against the fixing rotary body to form a fixing nip therebetween through which a recording medium bearing a toner image is conveyed; a heater disposed opposite the fixing rotary body to heat the fixing rotary body; a temperature detector spaced apart from the fixing rotary body to detect a temperature of the fixing rotary body based on the infrared rays from the fixing rotary body and disposed below the fixing nip in a vertical direction; and a tube disposed between the fixing rotary body and the temperature detector, the tube through which the infrared rays from the fixing rotary body enter the temperature detector. | 08-30-2012 |
20130188991 | FIXING DEVICE AND IMAGE FORMING APPARATUS EQUIPPED WITH FIXING DEVICE - A fixing device comprises a rotatable fixing member to heat a side of a recording medium bearing an unfixed image; a heat source to heat the rotatable fixing member; a rotatable pressing member disposed opposite the fixing member to press against an outer side of the fixing member; a housing to accommodate the fixing member and the pressing member; a conveyance path defined internally within the fixing device to convey a recording medium therethrough and between the fixing member and the pressing member, and a shutter actuator to move the shutter to open and close the conveyance path. The housing holds the shutter and the shutter actuator. | 07-25-2013 |
20130209121 | FIXING DEVICE AND IMAGE FORMING APPARATUS INCLUDING SAME - A fixing device includes a heat source; a fixing member looped into a generally cylindrical shape to rotate in a circumferential direction thereof and partially heated by the heat source and to heat a surface of a recording medium bearing an unfixed toner image to fix the unfixed toner image thereon in a fixing process; a rotary pressing member disposed facing the fixing member to form a nip therebetween, through which the recording medium is transported in a transport direction; and a rotation driver to rotate one of the fixing member and the pressing member. In a case in which the fixing member is halted for a reason other than the fixing process while power of the fixing device is on, electric power is not supplied to the heat source and the fixing member is rotated by a predetermined amount or more after the fixing member is halted. | 08-15-2013 |
20140064804 | FIXING DEVICE AND IMAGE FORMING APPARATUS INCLUDING SAME - A fixing device includes a rotary fixing member, a heater, a pressing member, a nip formation member, a reinforcement member, a sliding sheet, and a holding member. The nip formation member is disposed at an inner circumferential side of the fixing member and pressed by the pressing member via the fixing member to form a nipping portion. The reinforcement member is stationarily disposed in an internal diameter area of the fixing member to support the nip formation member. The sliding sheet is disposed between the nip formation member and an inner circumferential face of the fixing member. The holding member is disposed at a member differing from the nip formation member to hold the sliding sheet in a state in which the sliding sheet is in close contact with a nipping face of the nip formation member facing the nipping portion. | 03-06-2014 |
20140072355 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a rotatable fixing member; a heating source configured to heat the fixing member; an opposing member configured to come into contact with an outer circumferential surface of the fixing member to form a nip portion; and a shielding member configured to block heat from the heating source. The shielding member is configured to rotate about a position different from the center of the heating source so as to be movable between a shielding position and a retraction position. The shielding position is a position where the shielding member comes close to the heating source to block heat from the heating source to the fixing member. The retraction position being a position where the shielding member is retracted away from the shielding position. | 03-13-2014 |
20140079424 | FIXING DEVICE, IMAGE FORMING APPARATUS, AND FIXING METHOD - A fixing device includes a fixing rotary body, a heat shield movably disposed opposite the fixing rotary body, an opposed body contacting the fixing rotary body to form a nip therebetween through which a recording medium is conveyed, and a temperature detector to detect a temperature of at least one of the fixing rotary body and the opposed body. A controller, operatively connected to the heat shield and the temperature detector, determines a rotation angled position to which the heat shield is moved based on a size of the recording medium and the temperature of the at least one of the fixing rotary body and the opposed body detected by the temperature detector. | 03-20-2014 |
20140079453 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a fixing rotary body and a heater disposed opposite the fixing rotary body. A heat shield is movable in a circumferential direction of the fixing rotary body and interposed between the heater and the fixing rotary body to shield the fixing rotary body from the heater. An overheating suppressor is interposed between the heater and the heat shield to shield the heat shield from the heater. The heat shield includes an intermediate portion spanning in the circumferential direction of the fixing rotary body and movable between a shield position where the intermediate portion is disposed opposite the heater directly and a retracted position where the intermediate portion is disposed opposite the heater via the overheating suppressor. | 03-20-2014 |
20140079455 | FIXING DEVICE AND IMAGE FORMING APPARATUS INCORPORATING SAME - A fixing device included in an image forming apparatus includes a fixing rotary body, a heater disposed opposite the fixing rotary body, an opposed body contacting an outer circumferential surface of the fixing rotary body, a reflector disposed opposite the heater, and a heat shield disposed between the heater and the fixing rotary body and includes a shield portion to shield heat radiated from the heater to the fixing rotary body. Heat reflectance of at least a surface of the shield portion where the heat shield faces the heater is set to a value smaller than heat reflectance on a surface of the reflector opposite and facing the heater. Also, heat absorptance of at least a surface of the shield portion where the heat shield faces the heater is set to a value greater than heat absorptance on a surface of the reflector opposite and facing the heater. | 03-20-2014 |
20140270820 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a fixing rotary body rotatable in a predetermined direction of rotation and a heater disposed opposite and heating the fixing rotary body. A heat shield is movable in a circumferential direction of the fixing rotary body and interposed between the heater and the fixing rotary body to shield the fixing rotary body from the heater. A driver is connected to the heat shield to drive and move the heat shield within a circumferential moving span in the circumferential direction of the fixing rotary body. An abnormal temperature detector detects an abnormal temperature of the fixing rotary body that is not lower than a predetermined temperature. The abnormal temperature detector is disposed opposite a circumferential outboard span outboard from the circumferential moving span of the heat shield in the circumferential direction of the fixing rotary body. | 09-18-2014 |
20140270872 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a fixing rotary body rotatable in a predetermined direction of rotation and a heater disposed opposite and heating the fixing rotary body. An opposed body contacts the fixing rotary body to form a fixing nip therebetween through which a recording medium is conveyed. A heat shield is movable in a circumferential direction of the fixing rotary body and interposed between the heater and the fixing rotary body to shield the fixing rotary body from the heater. A driver is connected to the heat shield to drive and move the heat shield between a shield position where the heat shield is interposed between the heater and the fixing rotary body to shield the fixing rotary body from the heater and a retracted position where the heat shield is retracted from the shield position. A reinforcement is mounted on a long edge of the heat shield. | 09-18-2014 |
Patent application number | Description | Published |
20110115033 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - A semiconductor device which solves the following problem of a super junction structure: due to a relatively high concentration in the body cell region (active region), in peripheral areas (peripheral regions or junction end regions), it is difficult to achieve a breakdown voltage equivalent to or higher than in the cell region through a conventional junction edge terminal structure or resurf structure. The semiconductor device includes a power MOSFET having a super junction structure formed in the cell region by a trench fill technique. Also, super junction structures having orientations parallel to the sides of the cell region are provided in a drift region around the cell region. | 05-19-2011 |
20110241111 | SEMICONDUCTOR DEVICE - Investigation of problems of the device structure of a power MOSFET and mass production of it in relation to high breakdown voltage and low ON resistance when an epitaxy trench filling system is employed has revealed that it has the following problem, that is, a high breakdown voltage as expected cannot be achieved because a P-column region does not have an ideal rectangular parallelepipedal shape but has an inverted trapezoidal shape narrower at the bottom thereof and at the same time, has a concentration distribution lower at the bottom. In order to overcome the problem, the present invention provides a semiconductor device including a power MOSFET portion equipped, in an active cell region thereof, a super junction structure formed by a trench filling system, wherein a base epitaxial layer has a multistage structure with the upper portion having a higher impurity concentration. | 10-06-2011 |
20110278650 | POWER SEMICONDUCTOR DEVICE - A problem associated with n-channel power MOSFETs and the like that the following is caused even by relatively slight fluctuation in various process parameters is solved: source-drain breakdown voltage is reduced by breakdown at an end of a p-type body region in proximity to a portion in the vicinity of an annular intermediate region between an active cell region and a chip peripheral portion, arising from electric field concentration in that area. To solve this problem, the following measure is taken in a power semiconductor device having a superjunction structure in the respective drift regions of a first conductivity type of an active cell region, a chip peripheral region, and an intermediate region located therebetween: the width of at least one of column regions of a second conductivity type comprising the superjunction structure in the intermediate region is made larger than the width of the other regions. | 11-17-2011 |
20110284957 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - To fabricate a power MOSFET, etc. high in voltage-proofing (or breakdown voltage) and low in ON resistance (or On-state resistance) by a trench filling method, trial manufacture of power MOSFETs, etc. has been repeated with varying internal structures and layouts of super junction structures in a chip inner region located inside a guard ring. As a result, there occasionally occurred a source-drain voltage-proofing defect attributable to outer end portions of a supper junction structure. In one aspect of the present invention there is provided a semiconductor device having a power semiconductor element with a super junction structure introduced substantially throughout the whole surface of a drift region, the super junction structure being provided substantially throughout the whole surfaces of end portions of a semiconductor chip which configures the semiconductor device. | 11-24-2011 |
20120161231 | SEMICONDUCTOR DEVICE - In a semiconductor power device such as a power MOSFET having a super-junction structure in each of an active cell region and a chip peripheral region, an outer end of a surface region of a second conductivity type coupled to a main junction of the second conductivity type in a surface of a drift region of a first conductivity type and having a concentration lower than that of the main junction is located in a middle region between an outer end of the main junction and an outer end of the super-junction structure in the chip peripheral region. | 06-28-2012 |
20130037852 | POWER MOSFET, AN IGBT, AND A POWER DIODE - Super-junction MOSFETs by trench fill system requires void-free filling epitaxial growth. This may require alignment of plane orientations of trenches in a given direction. Particularly, when column layout at chip corner part is bilaterally asymmetrical with a diagonal line between chip corners, equipotential lines in a blocking state are curved at corner parts due to column asymmetry at chip corner. This tends to cause points where equipotential lines become dense, which may cause breakdown voltage reduction. In the present invention, in power type semiconductor active elements such as power MOSFETs, a ring-shaped field plate is disposed in chip peripheral regions around an active cell region, etc., assuming a nearly rectangular shape. The field plate has an ohmic-contact part in at least a part of the portion along the side of the rectangle. However, in the portion corresponding to the corner part of the rectangle, an ohmic-contact part is not disposed. | 02-14-2013 |
20130134500 | POWER SEMICONDUCTOR DEVICE - A problem associated with n-channel power MOSFETs and the like that the following is caused even by relatively slight fluctuation in various process parameters is solved: source-drain breakdown voltage is reduced by breakdown at an end of a p-type body region in proximity to a portion in the vicinity of an annular intermediate region between an active cell region and a chip peripheral portion, arising from electric field concentration in that area. To solve this problem, the following measure is taken in a power semiconductor device having a superjunction structure in the respective drift regions of a first conductivity type of an active cell region, a chip peripheral region, and an intermediate region located therebetween: the width of at least one of column regions of a second conductivity type comprising the superjunction structure in the intermediate region is made larger than the width of the other regions. | 05-30-2013 |
20130264650 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - A semiconductor device which solves the following problem of a super junction structure: due to a relatively high concentration in the body cell region (active region), in peripheral areas (peripheral regions or junction end regions), it is difficult to achieve a breakdown voltage equivalent to or higher than in the cell region through a conventional junction edge terminal structure or resurf structure. The semiconductor device includes a power MOSFET having a super junction structure formed in the cell region by a trench fill technique. Also, super junction structures having orientations parallel to the sides of the cell region are provided in a drift region around the cell region. | 10-10-2013 |
20140027842 | POWER SEMICONDUCTOR DEVICE - A problem associated with n-channel power MOSFETs and the like that the following is caused even by relatively slight fluctuation in various process parameters is solved: source-drain breakdown voltage is reduced by breakdown at an end of a p-type body region in proximity to a portion in the vicinity of an annular intermediate region between an active cell region and a chip peripheral portion, arising from electric field concentration in that area. To solve this problem, the following measure is taken in a power semiconductor device having a superjunction structure in the respective drift regions of a first conductivity type of an active cell region, a chip peripheral region, and an intermediate region located therebetween: the width of at least one of column regions of a second conductivity type comprising the superjunction structure in the intermediate region is made larger than the width of the other regions. | 01-30-2014 |
20140027847 | SEMICONDUCTOR DEVICE - In a semiconductor power device such as a power MOSFET having a super-junction structure in each of an active cell region and a chip peripheral region, an outer end of a surface region of a second conductivity type coupled to a main junction of the second conductivity type in a surface of a drift region of a first conductivity type and having a concentration lower than that of the main junction is located in a middle region between an outer end of the main junction and an outer end of the super-junction structure in the chip peripheral region. | 01-30-2014 |
20140110779 | VERTICAL POWER MOSFET - Vertical power MOSFETs having a super junction are devices capable of having a lower on resistance than other vertical power MOSFETs. Although they have the advantage of high-speed switching due to rapid depletion of an N type drift region at the time of turn off in switching operation, they are likely to cause ringing. A vertical power MOSFET having a super junction structure provided by the present invention has, in the surface region of a first conductivity type drift region under a gate electrode, an undergate heavily doped N type region having a depth shallower than that of a second conductivity type body region and having a concentration higher than that of the first conductivity type drift region. | 04-24-2014 |
20140191309 | VERTICAL POWER MOSFET - When forming a super junction by the embedded epitaxial method, adjusting a taper angle of dry etching to form an inclined column is generally performed in trench forming etching, in order to prevent a reduction in breakdown voltage due to fluctuations in concentration in an embedded epitaxial layer. However, according to the examination by the present inventors, it has been made clear that such a method makes design more and more difficult in response to the higher breakdown voltage. In the present invention, the concentration in an intermediate substrate epitaxy column area in each substrate epitaxy column area configuring a super junction is made more than that in other areas within the substrate epitaxy column area, in a vertical power MOSFET having the super junction by the embedded epitaxial method. | 07-10-2014 |
20140299961 | SEMICONDUCTOR DEVICE AND METHOD FOR MANUFACTURING THE SAME - A semiconductor device which solves the following problem of a super junction structure: due to a relatively high concentration in the body cell region (active region), in peripheral areas (peripheral regions or junction end regions), it is difficult to achieve a breakdown voltage equivalent to or higher than in the cell region through a conventional junction edge terminal structure or resurf structure. The semiconductor device includes a power MOSFET having a super junction structure formed in the cell region by a trench fill technique. Also, super junction structures having orientations parallel to the sides of the cell region are provided in a drift region around the cell region. | 10-09-2014 |
20140312418 | SEMICONDUCTOR DEVICE - In a semiconductor power device such as a power MOSFET having a super-junction structure in each of an active cell region and a chip peripheral region, an outer end of a surface region of a second conductivity type coupled to a main junction of the second conductivity type in a surface of a drift region of a first conductivity type and having a concentration lower than that of the main junction is located in a middle region between an outer end of the main junction and an outer end of the super-junction structure in the chip peripheral region. | 10-23-2014 |