Patent application number | Description | Published |
20100080274 | JITTER MEASUREMENT APPARATUS, JITTER CALCULATOR, JITTER MEASUREMENT METHOD, PROGRAM, RECORDING MEDIUM, COMMUNICATION SYSTEM AND TEST APPARATUS - Provided is a jitter measurement apparatus that measures timing jitter of a signal under measurement having a prescribed repeating pattern, comprising a sampling section that coherently samples the signal under measurement within a prescribed measurement duration; a waveform reconfiguring section that rearranges ordinal ranks of data values sampled by the sampling section to generate a reconfigured waveform that is a reproduction of a waveform of the signal under measurement; an analytic signal generating section that converts the reconfigured waveform into a complex analytic signal; and a jitter measuring section that measures jitter of the signal under measurement based on the analytic signal. | 04-01-2010 |
20100244881 | TRANSMISSION CHARACTERISTICS MEASUREMENT APPARATUS, TRANSMISSION CHARACTERISTICS MEASUREMENT METHOD, AND ELECTRONIC DEVICE - Provided is a transfer characteristic measurement apparatus that measures a transfer characteristic of a circuit under test between input and output, comprising a test signal input section that generates a test signal by adding together a carrier signal having a prescribed frequency and an additional signal having a frequency that differs from the prescribed frequency, and inputs the test signal to the circuit under test; and a transfer characteristic measuring section that measures the transfer characteristic of the circuit under test at the frequency of the additional signal based on a result from a measurement of an output signal output by the circuit under test. The circuit under test may be formed on a semiconductor chip. The circuit under test may correct a signal input to the semiconductor chip, and outputs the corrected signal. The semiconductor chip may further include a sampling circuit that samples the output signal of the circuit under test at the frequency of the carrier signal. | 09-30-2010 |
20100275072 | CORRECTING APPARATUS, PDF MEASUREMENT APPARATUS, JITTER MEASUREMENT APPARATUS, JITTER SEPARATION APPARATUS, ELECTRIC DEVICE, CORRECTING METHOD, PROGRAM, AND RECORDING MEDIUM - There is provided a correcting apparatus for correcting a PDF obtained from a measurement result of measuring a characteristic of a measurement target at strobe timings including errors with respect to ideal timings at predetermined intervals, the correcting apparatus including: an interpolation section that is supplied with a CDF of the measurement result, interpolates a value between each strobe timing of the CDF, calculates a value of the CDF at each of the ideal timings, and calculates a corrected CDF at the ideal timings; and a corrected function generating section that generates a corrected PDF in which the errors of the strobe timings for the PDF have been corrected, based on the corrected CDF calculated by the interpolation section. | 10-28-2010 |
20110099443 | TEST APPARATUS - Provided is a test apparatus that tests a device under test, comprising a plurality of test circuits that each perform a predetermined test function; a plurality of I/O circuits that are provided between the test circuits and the device under test, where at least one of the circuits has electrical characteristics that differ from the electrical characteristics of the other circuits; and an I/O switching section that switches which of the I/O circuits is used to electrically connect at least one of the test circuits to the device under test. | 04-28-2011 |
20120089371 | MEASUREMENT APPARATUS, MEASUREMENT METHOD, TEST APPARATUS AND RECORDING MEDIUM - Provided is a measurement apparatus that measures a signal under measurement having a waveform pattern that repeats with a predetermined cycle, comprising a sampling section that coherently samples the signal under measurement; and a waveform reconstructing section that reconstructs a partial waveform corresponding to a partial region of the waveform pattern, by arranging in a predetermined order pieces of sampling data corresponding to the partial region of the waveform pattern from among sampling data acquired by the sampling section. | 04-12-2012 |
20120161800 | MEASUREMENT CIRCUIT AND TEST APPARATUS - Provided is a measurement circuit that measures a signal under measurement input thereto, comprising a level comparing section that outputs a logic value according to a comparison result between a signal level of the signal under measurement and a set threshold level; a logic comparing section that acquires the logic value output by the level comparing section at a comparison timing input thereto; and a timing adjusting section that adjusts relative phases of a signal output by the level comparing section and the comparison timing, based on the expected value pattern of the signal under measurement and the threshold level. | 06-28-2012 |
Patent application number | Description | Published |
20100106457 | DETERMINISTIC COMPONENT MODEL JUDGING APPARATUS, JUDGING METHOD, PROGRAM, RECORDING MEDIUM, TEST SYSTEM AND ELECTRONIC DEVICE - Provided is a deterministic component model determining apparatus that determines a type of a deterministic component included in a probability density function supplied thereto, comprising a standard deviation calculating section that calculates a standard deviation of the probability density function; a spectrum calculating section that calculates a spectrum of the probability density function; a null frequency detecting section that detects a null frequency of the spectrum; a theoretical value calculating section that calculates a theoretical value of a spectrum for each of a plurality of predetermined types of deterministic components, based on the null frequency; a measured value calculating section that calculates a measured value of the spectrum for the deterministic component included in the probability density function, based on the standard deviation and the spectrum; and a model determining section that determines the type of the deterministic component included in the probability density function to be the type of deterministic component corresponding to a theoretical value closest to the measured value, from among the theoretical values for the plurality of types of deterministic components. | 04-29-2010 |
20100106468 | DETERMINISTIC COMPONENT MODEL IDENTIFYING APPARATUS, IDENTIFYING METHOD, PROGRAM, RECORDING MEDIUM, TEST SYSTEM AND ELECTRONIC DEVICE - There is provided a deterministic component model identifying apparatus for determining a type of a deterministic component contained in a probability density function supplied thereto. The deterministic component model identifying apparatus includes a spectrum calculating section that calculates a spectrum of the probability density function on an axis of a predetermined variable, a null value detecting section that detects a null value on the axis of the predetermined variable in the calculated spectrum, a theoretical value calculating section that calculates a theoretical value of a spectrum of the deterministic component in association with each of a plurality of predetermined deterministic component types, based on the null value detected by the null value detecting section, and a model determining section that determines, as the type of the deterministic component contained in the probability density function, a deterministic component type associated with a logarithmic magnitude spectrum difference most similar to a logarithmic magnitude spectrum of a Gaussian distribution, where the logarithmic magnitude spectrum difference is produced by subtracting the theoretical value of the spectrum of the deterministic component calculated in association with each of the plurality of predetermined deterministic component types from the spectrum calculated by the spectrum calculating section. | 04-29-2010 |
20100185407 | EVALUATION APPARATUS, EVALUATION METHOD, PROGRAM, RECORDING MEDIUM AND ELECTRONIC DEVICE - Provided is an evaluation apparatus that evaluates a characteristic of a propagation apparatus propagating a signal, comprising an output signal measuring section that measures a probability density function expressing a probability density distribution of jitter of an output signal passed by the propagation apparatus; an isolating section that isolates at least one of a random component of a jitter component and a deterministic component of the jitter component in the jitter of the output signal, from the probability density function of the jitter of the output signal; and an evaluating section that evaluates the characteristic of the propagation apparatus based on the jitter component isolated by the isolating section. | 07-22-2010 |
20100283480 | TEST APPARATUS, TEST METHOD, AND DEVICE - Provided is a test apparatus that tests a device under test, wherein the device under test includes an internal circuit that generates a plurality of internal clocks having different phases based on a reference clock provided thereto, selects from among the internal clocks an internal clock having a predetermined relative phase with respect to an input signal having a frequency substantially equal to that of the internal clocks, and samples the input signal according to the selected internal clock. The test apparatus comprises a selection control section that fixes the internal clock selected by the internal circuit; a phase control section that, with the selection of the internal clock being fixed by the selection control section, sequentially shifts the phase of the internal clock by inputting the reference clock to the device under test while sequentially shifting the phase of the reference clock outside of the device under test; and a measuring section that measures a characteristic of at least one of the input signal and the internal circuit, based on the sampling result of the internal circuit. | 11-11-2010 |
Patent application number | Description | Published |
20100239318 | Image forming apparatus - A printer according to the present invention is a so-called tandem-type printer, and has a configuration that a motor gear is directly connected to an M-photoconductor driving gear and an idler gear is directly connected to a Y-photoconductor driving gear and the M-photoconductor driving gear. A diameter of the Y and M photoconductors driving gear, a distance between transfer sections of the Y and M photoconductors, a motor gear input angle, and an idler input angle are set so that an absolute value of a value obtained by subtracting 1 from an ideal amplitude ratio, which indicates a ratio of an ideal amplitude of an eccentric component of the Y-photoconductor driving gear to an actual amplitude of an eccentric component of the M-photoconductor driving gear, is equal to or less than a maximum allowable amplitude ratio. | 09-23-2010 |
20110170892 | Drive transmission device and image forming apparatus including same - A drive transmission device including at least one drive source, a drive transmission member, and a drive gear train. The drive transmission member includes an engaging part that engages a first rotary body provided within a unit detachably attachable to an image forming apparatus and a gear part that engages a motor gear attached to the at least one drive source. The engaging part and the gear part are formed together as an integrated unit. The drive gear train that transmits a driving force from the at least one drive source to a second rotary body provided within the unit includes a first gear and a second gear. The first gear engages the motor gear and the second gear is attached to the drive transmission member. | 07-14-2011 |
20110304061 | SEMICONDUCTOR DEVICE - A semiconductor device in which it is possible to suppress short-circuiting between pads for chip arising from dicing processing is provided. The semiconductor device includes a semiconductor substrate, multiple first pads, and multiple second pads. The first pads are formed in an element formation region and the second pads are formed in a dicing line region surrounding the element formation region. The dicing line region includes a first region for which second pads are prone to electrically short-circuit to each other and a second region for which second pads are less prone to electrically short-circuit to each other. Some first pads arranged in positions opposite the first region are arranged farther away from one side of the outer edge of the element formation region than the remaining first pads arranged in positions opposite the second region are. | 12-15-2011 |
20120060633 | DRIVE TRANSMITTER AND IMAGE FORMING APPARATUS - A drive transmitter, including a first rotational axis transmitting a drive force of a drive source to a first rotator, a second rotational axis transmitting a drive force of the drive source to a second rotator, and an idler gear configured to transmit a drive force to the second rotational axis; wherein the first rotational axis penetrates the idler gear with a gap therebetween. | 03-15-2012 |
20120201571 | Synchronized Drive Unit And Image Forming Apparatus Having The Synchronized Drive Unit - A synchronized drive unit, including a drive member including a pulley; a driven member including a pulley; a relay member including to transmit a power; and timing belts hung around the drive and driven members through the relay member with tension and rotates the drive and driven members in synchronization, wherein each of the timing belts is formed of plural narrow timing belts parallely placed in a rotational axis direction of the pulley and the narrow timing belts are located on the driven member so as to counteract their eccentric components each other. | 08-09-2012 |
20130037968 | SEMICONDUCTOR APPARATUS AND SUBSTRATE - A semiconductor apparatus includes a semiconductor substrate having a main surface, a multilayer structure circuit formed over the main surface of the semiconductor substrate, a protective wall formed in the same layer as an uppermost layer of the multilayer structure circuit so as to surround the multilayer structure circuit in plan view, and an alignment mark formed in the same layer as the uppermost layer. The alignment mark is formed so as to contact at least part of the protective wall. | 02-14-2013 |
20130251404 | DRIVE UNIT AND IMAGE FORMING APPARATUS INCLUDING SAME - A drive unit includes a drive pulley connected to a drive source, a driven pulley connected to a target to be moved, at least one relay pulley for transmitting power from the drive pulley to the driven pulley, a plurality of belts including a first belt entrained around the drive pulley and the relay pulley, and a second belt entrained around the relay pulley and the driven pulley, a first tension application device, and a second tension application device. The first tension application device contacts the first belt to provide tension thereto. The second tension application device contacts the second belt to provide tension thereto. A cyclic speed variation component of the first belt in one rotation period transmitted to the driven pulley via the relay pulley and a speed variation component of the second belt in one rotation period transmitted to the driven pulley counteract each other. | 09-26-2013 |
20140123796 | GEAR TRANSMISSION DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A gear transmission device includes a first external gear driven by a drive motor attached to a first side of a frame and a first internal gear driven by the first external gear. The first internal gear includes an outer cylinder portion, an end plate, an annular opening, and an inner cylinder portion including a shaft hole,. The outer cylinder portion includes internal teeth formed on an inner circumferential surface thereof. The inner cylinder portion is formed concentrically inside the outer cylinder portion. The end plate connects the outer cylinder portion, the inner cylinder portion, and the shaft hole at one end in an axial direction. In a state in which the annular opening faces a second side of the frame opposite the first side thereof, the first external gear is inserted to the annular opening to mesh with the internal teeth of the outer cylinder portion. | 05-08-2014 |
20140251047 | DRIVE TRANSMISSION UNIT AND IMAGE FORMING APPARATUS INCLUDING SAME - A drive transmission unit includes a rotation input shaft to bear rotatably and coaxially a first input rotary body that rotates in a first direction and a second input rotary body, and a rotation output shaft to bear rotatably and coaxially a first output rotary body disposed in a radial direction of the first input rotary body and a second output rotary body disposed in the radial direction of the second input rotary body. A first switching device is disposed on the rotation input shaft and switches between a power transmitting state and a non-transmitting state between the first input rotary body and the second input rotary body. A second switching device is disposed on the rotation output shaft and switches between the power transmitting state and the non-transmitting state between the first output rotary body and the second output rotary body. | 09-11-2014 |
20140270851 | GEAR TRANSMISSION DEVICE, PROCESS UNIT INCLUDING THE GEAR TRANSMISSION DEVICE, AND IMAGE FORMING APPARATUS INCLUDING SAME - A gear transmission device includes a drive rotator and a driven external gear. The drive rotator includes a drive internal gear to rotate about a rotary shaft. The driven external gear meshes with the drive internal gear to transmit a drive force to a drive target. | 09-18-2014 |
20140341613 | GEAR TRANSMISSION DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A gear transmission device includes a first external gear driven by a drive motor attached to a first side of a frame and a first internal gear driven by the first external gear. The first internal gear includes an outer cylinder portion, an end plate, an annular opening, and an inner cylinder portion including a shaft hole. The outer cylinder portion includes internal teeth formed on an inner circumferential surface thereof. The inner cylinder portion is formed concentrically inside the outer cylinder portion. The end plate connects the outer cylinder portion, the inner cylinder portion, and the shaft hole at one end in an axial direction. In a state in which the annular opening faces a second side of the frame opposite the first side thereof, the first external gear is inserted to the annular opening to mesh with the internal teeth of the outer cylinder portion. | 11-20-2014 |
20150050051 | DRIVE UNIT AND IMAGE FORMING APPARATUS INCLUDING SAME - A drive unit includes a drive pulley connected to a drive source, a driven pulley connected to a target to be moved, at least one relay pulley for transmitting power from the drive pulley to the driven pulley, a plurality of belts including a first belt entrained around the drive pulley and the relay pulley, and a second belt entrained around the relay pulley and the driven pulley, a first tension application device, and a second tension application device. The first tension application device contacts the first belt to provide tension thereto. The second tension application device contacts the second belt to provide tension thereto. A cyclic speed variation component of the first belt in one rotation period transmitted to the driven pulley via the relay pulley and a speed variation component of the second belt in one rotation period transmitted to the driven pulley counteract each other. | 02-19-2015 |
20150060191 | DRIVE SYSTEM AND IMAGE FORMING APPARATUS INCLUDING SAME - A drive system includes multiple vibrating members that tend to vibrate when these members are driven and a holding system to hold the multiple vibrating members. The holding system at least includes a first holding unit and a second holding unit superimposed on and partially connected to each other. The multiple vibrating members include a first vibrating member and a second vibrating member. The first vibrating member is held by the first holding unit and is not held by the second holding unit. The second vibrating member is held by the second holding unit and is not held by the first holding unit. At least one of the first vibrating member and the second vibrating member is a driving device to drive another member as a drive source. | 03-05-2015 |
20150110517 | SOUND ABSORBER AND IMAGE FORMING APPARATUS INCORPORATING SAME - A sound absorber includes a duct member constituting a resonance pathway, the duct member including a pathway portion communicating ends of the duct member; a base member including a concave portion; and a cover member including a neck in which to insert the duct member. The cover member covers the concave portion of the base member, and the cover member combined with the base member forms a resonance space having a volume V The resonance pathway has dimensions of a length LH and a cross-sectional area SH and communicates the resonance space and an exterior of the sound absorber. The sound absorber has a resonance frequency fH determined by fH=(c/2π)·(SH/V·LH) | 04-23-2015 |
20150241838 | ACOUSTIC DEVICE, AND ELECTRONIC DEVICE AND IMAGE FORMING APPARATUS INCORPORATING SAME - An acoustic device includes an opening; a flange forming the opening; a first member including the opening and the flange; and a second member joined to the first member, thereby forming a cavity. The second member is formed of a material with a density lower than a material of the first member. | 08-27-2015 |
20150243274 | SOUND ABSORBING DEVICE, ELECTRONIC DEVICE, AND IMAGE FORMING APPARATUS - A sound absorbing device including a Helmholtz resonator also includes a projection part having a shape of protruding from an outer wall surface of a communicating part forming plate among the communicating part forming plate and a cavity forming member that are cavity part forming members forming a cavity part of the Helmholtz resonator, and surrounding an opening of a communicating part that causes the cavity part to communicate with the outside. | 08-27-2015 |
20150248880 | CABINET STRUCTURE, ELECTRONIC EQUIPMENT, AND IMAGE FORMING APPARATUS - A cabinet structure includes multiple cover members configured to spatially partition an inside from an outside of a cabinet, and a clearance communicating between the inside and the outside of the cabinet is left between two cover members, the two cover members being adjacent to each other, of the cover members, and a passage defined by the clearance and leading from the inside to the outside of the cabinet through the clearance has a shape with multiple bends. | 09-03-2015 |
20150277337 | DRIVE TRANSMISSION UNIT AND IMAGE FORMING APPARATUS INCORPORATING SAME - A drive transmission unit is described that includes a drive source, and a rotatable drive transmitting member to transmit a driving force from the drive source. The drive transmitting member includes a bottom part intersecting an axis of the drive transmitting member, a circular transmitting part extending from the bottom part in an axial direction of the drive transmitting member and including an internal toothed surface on an inner circumferential surface of the transmitting part to mesh with a first member, and a first projecting part and a second projecting part projecting in opposite directions from the bottom part along the axial direction of the drive transmitting member and having different diameters. | 10-01-2015 |
20150309467 | GEAR TRANSMISSION DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A gear transmission device includes a first external gear driven by a drive motor attached to a first side of a frame and a first internal gear driven by the first external gear. The first internal gear includes an outer cylinder portion, an end plate, an annular opening, and an inner cylinder portion including a shaft hole. The outer cylinder portion includes internal teeth formed on an inner circumferential surface thereof. The inner cylinder portion is formed concentrically inside the outer cylinder portion. The end plate connects the outer cylinder portion, the inner cylinder portion, and the shaft hole at one end in an axial direction. In a state in which the annular opening faces a second side of the frame opposite the first side thereof, the first external gear is inserted to the annular opening to mesh with the internal teeth of the outer cylinder portion. | 10-29-2015 |
20150343816 | ELECTRONIC DEVICE AND IMAGE FORMING APPARATUS - An electronic device comprises: a shielding object that is arranged at least in a plurality of directions and shields noise; and a Helmholtz silencer that is arranged in a direction where the shielding object does not exist, the shielding object and the silencer being arranged with respect to a noise source causing noise such as a driving source that is arranged inside an apparatus body, wherein a neck portion of the Helmholtz silencer is directed to the noise source, a plurality of such Helmholtz silencers are provided to correspond to at least two kinds of frequencies, and installed number of the Helmholtz silencers corresponding to at least two kinds of the frequencies respectively, is made different depending on a distance from the noise source. | 12-03-2015 |
20150344804 | DRIVE DEVICE, IMAGE FORMING APPARATUS, AND GREASE COMPOSITION - A drive device includes a slide bearing; a shaft that passes through the slide bearing; a gear that is fixed to the shaft; and a grease composition that is held in a clearance between the slide bearing and the shaft. At least one of the slide bearing and the shaft is made of a resin. The clearance is in a range of 10 to 110 μm. The grease composition contains a hydrocarbon base oil and lithium soap serving as a thickener. A weight ratio of the hydrocarbon base oil to the lithium soap is in a range of 94.5:5.5 to 96.0:4.0. A consistency of the grease composition is in a range of 360 to 400. | 12-03-2015 |
20150344809 | DRIVE DEVICE, IMAGE FORMING APPARATUS, AND GREASE COMPOSITION - A drive device includes a plurality of gears; and a grease composition that is held on a tooth flank of at least one gear of the gears. The at least one gear is made of a resin. The grease composition contains a hydrocarbon base oil, lithium soap serving as a thickener, and olefin resin powder. A weight ratio between the hydrocarbon base oil and the lithium soap in the grease composition is in a range of 94.5:5.5 to 96.0:4.0. A consistency of the grease composition is in a range of 360 to 400. | 12-03-2015 |
20150345614 | DRIVE DEVICE, IMAGE FORMING APPARATUS, AND GREASE COMPOSITION - A drive device includes a gear having a hole; a shaft that passes through the hole; and a grease composition that is held in a clearance between the shaft and an inner peripheral surface of the hole. The gear rotates on a peripheral surface of the shaft. At least one of the gear and the shaft is made of a resin. The clearance is in a range of 10 to 110 μm . The grease composition contains a hydrocarbon base oil and lithium soap serving as a thickener. A weight ratio of the hydrocarbon base oil to the lithium soap is in a range of 94.5:5.5 to 96.0:4.0. A consistency of the grease composition is in a range of 360 to 400. | 12-03-2015 |
20150369338 | DRIVE TRANSMITTER AND IMAGE FORMING APPARATUS INCORPORATING THE DRIVE TRANSMITTER - A drive transmitter includes an internally toothed gear, a first support shaft to rotatably support the internally toothed gear without using a bearing, a drive source to apply a driving force to the internally toothed gear, a rotary body to which the driving force is transmitted via the internally toothed gear, and a grease retainer disposed on the first support shaft and to retain grease on at least one of a portion of the first support shaft facing the internally toothed gear and a portion of the internally toothed gear facing the first support shaft. An image forming apparatus includes the drive transmitter. | 12-24-2015 |
20150370214 | DRIVE TRANSMITTER AND IMAGE FORMING APPARATUS INCORPORATING THE DRIVE TRANSMITTER - A drive transmitter includes a group of gears to which grease is applied, at least one gear of the group of gears being an internally toothed gear, multiple pulleys, and a drive belt wound around the multiple pulleys to drive the group of gears. An image forming apparatus includes the drive transmitter. | 12-24-2015 |
20150370215 | DRIVING DEVICE AND IMAGE FORMING APPARATUS - A driving device includes: a plurality of vibrating members that vibrate when the vibrating members are driven; and a holding part that holds the vibrating members. The holding part includes a first member with which one or more of the vibrating members are brought into contact, and a second member with which one or more of the vibrating members are brought into contact. The first member and the second member are partially coupled to each other. A grounding member for electrically grounding a member held by the holding part is brought into contact with one of the first member and the second member that is more difficult to vibrate. | 12-24-2015 |
20160033928 | IMAGE FORMING APPARATUS - According to an aspect of the invention, an image forming apparatus includes an apparatus body, a sound absorbing device utilizing a Helmholtz resonator, and a hinged exterior cover operable to open and close relative to the apparatus body. The hinged exterior cover is a hinged cover configured to pivot about a pivot shaft arranged at a lower end portion of the hinged exterior cover. At least a part of the hinged exterior cover has a multiplex structure made by overlaying a plurality of plate-like members on one another. The sound absorbing device is formed by utilizing space between two plate-like members of the plurality of plate-like members making up the multiplex structure as a cavity of the Helmholtz resonator. | 02-04-2016 |
20160085204 | CABINET STRUCTURE, ELECTRONIC EQUIPMENT, AND IMAGE FORMING APPARATUS - A cabinet structure includes multiple cover members configured to spatially partition an inside from an outside of a cabinet, and a clearance communicating between the inside and the outside of the cabinet is left between two cover members, the two cover members being adjacent to each other, of the cover members, and a passage defined by the clearance and leading from the inside to the outside of the cabinet through the clearance has a shape with multiple bends. | 03-24-2016 |
20160111075 | ACOUSTIC DEVICE, AND ELECTRONIC DEVICE AND IMAGE FORMING APPARATUS INCORPORATING SAME - An acoustic device includes an opening; a flange forming the opening; a first member including the opening and the flange; and a second member joined to the first member, thereby forming a cavity. The second member is formed of a material with a density lower than a material of the first member. | 04-21-2016 |
Patent application number | Description | Published |
20090134428 | NITRIDE SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD THEREOF - A nitride semiconductor device includes: a semiconductor substrate; a p-type semiconductor layer formed over the semiconductor substrate, made of a nitride semiconductor, and containing first impurities; and an insulating film contacting the p-type semiconductor layer and having an impurity region containing second impurities for trapping hydrogen. Since residual hydrogen in the p-type semiconductor layer is trapped in the impurity region, the hydrogen concentration in the impurity region is higher than that in the insulating film excluding the impurity region. | 05-28-2009 |
20110248241 | NITRIDE SEMICONDUCTOR ELEMENT - A nitride semiconductor element includes: a strain suppression layer formed on a silicon substrate via an initial layer; and an operation layer formed on the strain suppression layer. The strain suppression layer includes a first spacer layer, a second spacer layer formed on and in contact with the first spacer layer, and a superlattice layer formed on and in contact with the second spacer layer. The first spacer layer is larger in lattice constant than the second spacer layer. The superlattice layer has first layers and second layers smaller in lattice constant than the first layers stacked alternately on top of one another. The average lattice constant of the superlattice layer is smaller than the lattice constant of the first spacer layer and larger than the lattice constant of the second spacer layer. | 10-13-2011 |
20130113018 | FIELD EFFECT TRANSISTOR - A first group III nitride semiconductor layer has a low carbon concentration region having a carbon concentration of less than 1×10 | 05-09-2013 |
20130171811 | METHOD FOR MANUFACTURING COMPOUND SEMICONDUCTOR - In a method for manufacturing a compound semiconductor, a silicon oxide film is formed in an upper part of a substrate made of silicon. Subsequently, a base layer made of single crystal silicon to which ions are implanted is formed by performing ion implantation to a region of the substrate below the silicon oxide film and performing a thermal process. Then, the base layer is exposed by removing the silicon oxide film. Finally, a GaN layer is formed on the base layer. | 07-04-2013 |
20130240901 | NITRIDE SEMICONDUCTOR DEVICE - A nitride semiconductor device includes a substrate, and a first nitride semiconductor layer, a second nitride semiconductor layer, a third nitride semiconductor layer, and a fourth nitride semiconductor layer sequentially formed on the substrate. A channel is formed in the third nitride semiconductor layer, and includes carriers accumulated near an interface between the third nitride semiconductor layer and the fourth nitride semiconductor layer. The second nitride semiconductor layer has a band gap larger than that of the third nitride semiconductor layer. The first nitride semiconductor layer has a band gap equal to or larger than that of the second nitride semiconductor layer, and has a carbon concentration higher than that of the second nitride semiconductor layer. | 09-19-2013 |
20150287791 | NITRIDE SEMICONDUCTOR DEVICE AND NITRIDE SEMICONDUCTOR SUBSTRATE - An object of the present invention is to provide a nitride semiconductor device and a nitride semiconductor substrate in each of which a nitride semiconductor layer formed on a silicon substrate is improved in crystallinity to realize a decrease in on-resistance of a field-effect transistor. The nitride semiconductor device includes a silicon substrate, and a first nitride semiconductor layer formed over the silicon substrate and including a nitride semiconductor, wherein a Si <111> axial direction of the silicon substrate is different from a <0001> axial direction of the first nitride semiconductor layer. | 10-08-2015 |
20150303293 | FIELD-EFFECT TRANSISTOR - A field-effect transistor includes a codoped layer made of Al | 10-22-2015 |