| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 359205000 | Having particular focusing element to receive scanned light | 29 |
| 20080218828 | Optical scanning unit and image forming apparatus incorporating same - An optical scanning unit used for scanning a photoconductor includes a light source, a rotatable deflector, a driver, a scan lens, an optical element, a first casing, a second casing, a first cover, and a second cover. The rotatable deflector deflects a light beam generated by the light source to scan a surface of the photoconductor. The driver rotates the rotatable deflector. The scan lens converts the light beam deflected by the rotatable deflector with equiangular motion speed to a light beam having constant speed motion. The optical element is disposed along an optical path from the scan lens to the photoconductor surface. The first casing houses the light source, the rotatable deflector, and the scan lens. The second casing houses the first casing and the optical element. The first cover covers at least the first casing. The second cover covers the optical element housed in the second casing. | 09-11-2008 |
| 20080239436 | OPTICAL BEAM SCANNING APPARATUS, METHOD OF MANUFACTURING OPTICAL BEAM SCANNING APPARATUS, IMAGE FORMING APPARATUS AND METHOD OF MANUFACTURING IMAGE FORMING APPARATUS - In an image forming apparatus according to the invention, an optical beam scanning apparatus of an overillumination scanning optical system includes a laser, a pre-deflection optical system, a polygon mirror, and a post-deflection optical system, wherein the post-deflection optical system includes at least one optical element configured by allowing a resin to flow into a molding die through a gate opening provided in advance to the molding die and then molding the resin into a prescribed shape; and in the optical element, a side corresponding to a side of the gate opening through which the resin flows is provided to a light incidence side where the luminous flux enters into the polygon mirror. | 10-02-2008 |
| 20080239437 | OPTICAL BEAM SCANNING APPARATUS AND IMAGE FORMING APPARATUS - An image forming apparatus provided with an optical beam scanning apparatus according to the invention includes a semiconductor laser device, a pre-deflection optical system, a polygon mirror, and a post-deflection optical system, wherein at least one imaging lens for imaging the luminous flux is provided in the post-deflection optical system includes; at least one projection on a vertical surface to a sub-scanning direction axis is provided in the imaging lens; and at least one positioning member having an engaging groove into which the projection is interfitted and which is engaged in a concave-convex shape is provided in the housing unit of the optical beam scanning apparatus. In accordance with an image forming apparatus according to the invention, in a scanning optical system using an imaging lens or an imaging mirror, influences against optical characteristics following an environmental fluctuation or a change with time can be reduced. | 10-02-2008 |
| 20080239438 | OPTICAL BEAM SCANNING APPARATUS AND IMAGE FORMING APPARATUS - In an image forming apparatus provided with an optical beam scanning apparatus according to the invention, an optical beam scanning apparatus of an overillumination scanning optical system includes a semiconductor laser device as a light source, a pre-deflection optical system, a polygon mirror, and a post-deflection optical system, with a width of the luminous flux made incident on the polygon mirror being wider than a width of one reflecting surface forming the polygon mirror, wherein at least two sheets of flat plate for transmitting the luminous flux scanned by the polygon mirror are provided in the post-deflection optical system. In accordance with an image forming apparatus provided with an optical beam scanning apparatus according to the invention, not only a wave front aberration on a photoconductive drum can be suitably corrected, but suitable beam diameter and beam profile can be obtained on the photoconductive drum. | 10-02-2008 |
| 20080239439 | SCANNING OPTICAL SYSTEM - A scanning optical system configured to scan laser light on a scanned surface in a scanning direction, includes a light source emitting the laser light, a converging element converging the emitted laser light in the predetermined scanning direction, a deflector deflecting the converged laser light to scan the laser light on the scanned surface, and a scanning speed controlling element controlling the deflected laser light to be scanned at a constant scanning speed. The scanning optical system is configured to satisfy predetermined conditions. | 10-02-2008 |
| 20080239440 | IMAGING OPTICAL SYSTEM AND IMAGE READING APPARATUS USING THE SAME - Obtained are an imaging optical system having a simple structure in which imaging position deviation due to deformation caused by a weight of an off-axial optical element is reduced and an image reading apparatus using the same. According to an imaging optical system for image reading, image information on an original surface is imaged on a sensor, and is read by the sensor. The imaging optical system includes reflection-type off-axial optical elements, each of which has an outer shape whose lengths in directions orthogonal to each other are different from each other and whose thickness is smaller than a length of the outer shape in a short-direction thereof and is made of a resin material. The plurality of off-axial optical elements are disposed such that mirror surfaces thereof are opposed to each other and constructed to satisfy a conditional expression. | 10-02-2008 |
| 20080259426 | LIGHT SCANNING DEVICE AND IMAGE FORMING APPARATUS - A light scanning device includes: a light source; an aperture stop regulating a width of a light beam emitted from the light source; a deflector deflecting and scanning the light beam emitted from the light source; at least one scanning lens forming an image on a scanned surface with the light beam deflected and scanned; and a phase-type optical element. In the light scanning device, a phase modulation portion is provided to at least a portion of the phase-type optical element, and a phase difference between the phase modulation portion and a region other than the phase modulation portion is not π [radian]. Thus, asymmetry in a curve representing the relationship between a beam spot diameter and defocus can be corrected to reduce variation of the beam spot diameter with respect to the defocus. Consequently, highly-accurate light scanning can be performed. | 10-23-2008 |
| 20080285104 | OPTICAL SCANNER AND IMAGE FORMING APPARATUS - An optical scanner includes a plurality of scanning optical systems each of which scans a different surface to be scanned and includes a light source configured to emit a light beam, an optical deflector having a plurality of reflection surfaces, and a synchronization detector configured to receive the light beam deflected by the optical deflector and detect a timing to scan an effective area of the surface to be scanned with the deflected light beam before a scanning is started or after the scanning is completed. The synchronization detector of one of a pair of scanning optical systems is disposed on a scanning end side to determine the scanning timing, and the synchronization detector of the other one of the pair of scanning optical systems is disposed on a scanning start side to determine the scanning timing. | 11-20-2008 |
| 20080297872 | OPTICAL BEAM SCANNING DEVICE, OPTICAL BEAM SCANNING METHOD - There is provided a technique in which in an optical beam scanning device, optical characteristics can be suitably corrected according to a change in environmental temperature. The optical beam scanning device is configured to shape a divergent light from a light source into a light flux having a specified sectional shape by a pre-deflection optical system and to guide the light flux, which is shaped by the pre-deflection optical system | 12-04-2008 |
| 20080297873 | OPTICAL BEAM SCANNING DEVICE, OPTICAL BEAM SCANNING METHOD - There is provide a technique in which in an optical beam scanning device, optical characteristics can be suitably corrected according to a change in environmental temperature. The optical beam scanning device is configured to shape a divergent light from a light source into a light flux having a specified sectional shape by a pre-deflection optical system | 12-04-2008 |
| 20090002792 | Optical scanning device and image forming apparatus - An optical scanning device includes a first optical element that converts a cross-section shape of a light beam from a semiconductor laser to a desired shape; a second optical element that guides the light beam output from the first optical element to an optical deflector that deflects the light beam; and a third optical element that gathers the light beam deflected by the optical deflector onto a surface to be scanned to form a light spot thereby optically scanning the surface. At least one of the first optical element, the second optical element, and the third optical element includes a resin-made lens, at least one of the resin-made lenses has a power diffracting surface, and a surface shape of at least one of power diffracting surfaces is formed so that a power of a diffracting portion and a power of a refractive portion are cancelled out. | 01-01-2009 |
| 20090009839 | OPTICAL BEAM SCANNING DEVICE, IMAGE FORMING APPARATUS - A technique is provided which enables proper correction of optical characteristics in accordance with change in ambient temperature. | 01-08-2009 |
| 20090009840 | Optical scanner and image forming apparatus including same - An optical scanner scans a plurality of objects respectively with optical beams and includes a deflector assembly including at least one deflecting unit that deflects the optical beams in a main scanning direction and a plurality of reflection optical systems each including a plurality of reflection mirrors to reflect one of the optical beams and a curvature adjustment unit. The curvature adjustment unit forcibly curves one of the reflection mirrors in a direction opposite the main scanning direction with a holder structure, pushes the reflection mirror in a direction opposite the direction of the forcible curve with a pressure unit, and adjusts a direction and an amount of curvature of a main scanning line by adjusting an amount that the pressure unit deforms the reflection mirror. The main scanning lines on the plurality of objects are curved in a similar direction due to the forcible curve of the reflection mirror. | 01-08-2009 |
| 20090015896 | OPTICAL SCANNING DEVICE AND IMAGE FORMING APPARATUS - An optical scanning device, which scans a surface to be scanned by light, includes a light source, a coupling optical system, which changes light from the light source into approximately parallel light, a light control reflection member which is disposed in an optical path of the light from the coupling optical system, the light control reflection member defining a diameter of a beam of the light which scans the surface to be scanned, and reflecting a part of the light which is not used for the scanning toward the coupling optical system, and a light detector which receives the light reflected by the light control reflection member via the coupling optical system. | 01-15-2009 |
| 20090015897 | OPTICAL SCAN APPARATUS AND IMAGE FORMATION APPARATUS - An optical scan apparatus is configured to include a light source emitting a light beam; a vibration mirror deflecting the light beam emitted from the light source to scan a scan area; a drive unit driving the vibration mirror; and an optical imaging system focusing the light beam deflected by the vibration mirror on a predetermined focus position, and having optical power to correct a displacement of the focus position which occurs due to a deformation of the vibration mirror caused by its own vibration. | 01-15-2009 |
| 20090015898 | OPTICAL BEAM SCANNING APPARATUS AND IMAGE FORMING APPARATUS - An image forming apparatus provided with an optical beam scanning apparatus according to the invention includes a semiconductor laser device, a pre-deflection optical system, a polygon mirror, and a post-deflection optical system, wherein at least one imaging lens for imaging the luminous flux is provided in the post-deflection optical system includes; at least one projection on a vertical surface to a sub-scanning direction axis is provided in the imaging lens; and at least one positioning member having an engaging groove into which the projection is interfitted and which is engaged in a concave-convex shape is provided in the housing unit of the optical beam scanning apparatus. In accordance with an image forming apparatus according to the invention, in a scanning optical system using an imaging lens or an imaging mirror, influences against optical characteristics following an environmental fluctuation or a change with time can be reduced. | 01-15-2009 |
| 20090046343 | OPTICAL SCANNER CONFIGURED SO A PRINCIPAL RAY OF AN INCIDENT BEAM FROM A LIGHT SOURCE TO A DEFLECTOR AND A PRINCIPAL RAY OF A SCANNING BEAM FROM THE DEFLECTOR TO A SCANNED SURFACE TRAVEL ON OPPOSITE SIDES OF AN OPTICAL AXIS OF OPTICAL ELEMENT(S) HAVING TRANSMISSIVE SURFACES BOTH CONCAVE TOWARD THE DEFLECTOR IN SUB-SCANNING SECTION, AND IMAGE FORMING APPARATUS USING THE SAME - At least one exemplary embodiment is related to an optical scanner, which includes at least one optical element that can separate ghost light from scanning light facilitating the blocking of the ghost light. | 02-19-2009 |
| 20090051994 | OPTICAL BEAM SCANNING APPARATUS AND IMAGE FORMING APPARATUS - An optical beam scanning apparatus and an image forming apparatus having the optical beam scanning apparatus are provided. The optical beam scanning apparatus includes a light source; a pre-deflection optical system; an optical beam deflecting device; a sensor; and a post-deflection optical system. An exit surface of the imaging lens includes a lens-shaped portion for imaging the light flux on a scanned surface of the scanned object, and a totally reflecting surface-shaped portion having a totally reflecting surface for totally reflecting a portion of the light flux from the deflecting surface of the optical beam deflecting device at least two times, and the incident surface of the imaging lens includes a transmission surface-shaped portion having a transmission surface for transmitting the light flux totally reflected by the totally reflecting surface, and the light flux transmitted through the transmission surface is directed to the sensor. | 02-26-2009 |
| 20090059337 | OPTICAL SCANNING DEVICE AND IMAGE FORMING APPARATUS - A temperature of a scanning optical system is different from a temperature of a light source when an optical scanning device is in operation, and when the both temperatures are assumed to be equal, a diffractive surface of a diffractive optical element is set according to a magnitude relationship between both temperatures when the optical scanning device is in operation such that a deviation amount of an in-focus position of the light flux by the diffractive optical element becomes larger or smaller than a deviation amount for canceling a deviation amount of an in-focus position of the light flux by the scanning optical system. | 03-05-2009 |
| 20090067021 | OPTICAL BEAM SCANNING APPARATUS, OPTICAL BEAM SCANNING METHOD AND IMAGE FORMING APPARATUS - An optical beam scanning apparatus according to the present invention includes a light source, a pre-deflection optical system, a light deflecting device, a post-deflection optical system, a first sensor configured to detect a part of the luminous fluxes deflected by the light deflecting device, one or plural first optical elements configured to be provided in the post-deflection optical system and act on the luminous fluxes deflected by all the deflection surfaces of the light deflecting device; and a second optical element having positive power in the sub-scanning direction configured to be provided in an optical path between any one of the first optical elements and the first sensor and act on the luminous fluxes deflected by all the deflection surfaces of the light deflecting device. | 03-12-2009 |
| 20090067022 | OPTICAL BEAM SCANNING APPARATUS, OPTICAL BEAM SCANNING METHOD, IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An optical beam scanning apparatus according to the present invention includes a pre-deflection optical system, a post-deflection optical system at least including one or plural first optical elements, plural second optical elements, a first reflection mirror which is provided in optical path between the first optical element and one of the second optical elements and reflects, on a most upstream side of the optical paths, a luminous flux on a most downstream side or a most upstream side in the sub-scanning direction among the plural luminous fluxes, and a second reflection mirror which is provided in optical path between the first optical element and another second optical element and reflects, on an optical path second from a most downstream side of the optical paths, the luminous flux on the most downstream side or the most upstream side in the sub-scanning direction among the plural luminous fluxes. | 03-12-2009 |
| 20090067023 | OPTICAL BEAM SCANNING APPARATUS, OPTICAL BEAM SCANNING METHOD AND IMAGE FORMING APPARATUS - An optical beam scanning apparatus according to the present invention includes a light source, a pre-deflection optical system, a light deflecting device, a post-deflection optical system configured to at least include one or plural first optical elements which act on the luminous fluxes for all color components, plural second optical elements which respectively act on the luminous fluxes for each of color components, and plural first reflection mirrors that are respectively provided on an upstream side of the plural second optical elements in optical paths and reflect luminous fluxes emitted from the first optical elements, and a position adjusting mechanism configured to adjust positions of the first reflection mirrors. | 03-12-2009 |
| 20090067024 | OPTICAL BEAM SCANNING APPARATUS, OPTICAL BEAM SCANNING METHOD, IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An optical beam scanning apparatus according to the present invention includes a light source, a pre-deflection optical system, a light deflecting device configured to separate the luminous fluxes in a sub-scanning direction for each of color components and scan the luminous fluxes against a scanning object in the main scanning direction, a post-deflection optical system configured to at least include one or plural first optical elements, plural second optical elements, plural reflection mirrors which are respectively provided on a downstream side of the second optical elements in plural optical paths excluding an optical path in which any one of the second optical elements is included and reflect luminous fluxes emitted from the second optical elements, and a position adjusting mechanism which adjusts positions of the reflection mirrors, imaging the luminous fluxes scanned by the light deflecting device on the scanning object. | 03-12-2009 |
| 20090073531 | LIGHT SOURCE MODULE, OPTICAL SCANNING DEVICE, AND IMAGE FORMING APPARATUS - A coupling lens collimates an optical beam emitted from a laser light source. An aperture shields a peripheral light flux area of the collimated optical beam. A phase adjusting element partially changes a phase of wavefront of the optical beam. An auxiliary aperture is formed on an outer side of a normalized aperture size in at least one of a main scanning direction and a sub-scanning direction. The phase adjusting element is formed in a parallel plate, and changes at least a phase of wavefront of a peripheral portion of the optical beam to compensate decreases of the beam spot size and the depth allowance caused by the auxiliary aperture. | 03-19-2009 |
| 359206000 | High distortion lens (e.g., fO lens, etc.) | 3 |
| 20080259427 | Lens System and Scanner Device Equipped Therewith - An F/theta lens system for focusing high-power laser radiation in a flat image field including at least two lenses. The at least two lenses are arranged sequentially in a beam path, where the at least two lenses are made from a material that is stable when exposed to laser radiation having a power of more than 1 kW, and at least one of the lenses has at least one aspherical lens surface. | 10-23-2008 |
| 20080273232 | Beam Irradiation apparatus, beam irradiation method, and method for manufacturing thin film transistor - A galvanometer mirror rotates in one direction when the galvanometer mirror is used. A spot can be scanned on an irradiated surface at a more constant speed by rotating the galvanometer mirror and by using the inertia. Moreover, it is preferable to make the galvanometer mirror heavy because the inertia becomes higher so that the spot is scanned at a more constant speed. In addition, in a polygon mirror of this invention, mirrors are arranged so as not to contact each other because a change time of the scanning position between the mirrors is provided. By moving the irradiated object with timing together when the laser light is not irradiated, the laser process can be performed efficiently. | 11-06-2008 |
| 20090002793 | LIGHT SCANNING SYSTEM AND IMAGE FORMING APPARATUS - A light scanning system and an image forming apparatus including the same, the light scanning system including: one or more light sources to emit light; a deflector to deflect the emitted light; and one or more f-θ lenses to focus the deflected light onto a photosensitive medium, wherein the light emitted by the one or more light sources is obliquely incident on a plane perpendicular to a rotational axis of the deflector, and the f-θ lens satisfies −0.5| 01-01-2009 | |
| 359207000 | Anamorphic element | 2 |
| 20090009841 | OPTICAL SCANNING DEVICE AND IMAGE FORMING APPARATUS USING THE SAME - An optical scanning device includes a rotary polygonal mirror, an input optical system for direct a light beam from a light source to a deflecting surface of the rotary polygonal mirror, and an imaging optical system for imaging the deflected light beam on a scan surface, wherein in a main scan section the light beam incident on the deflecting surface has a beam width wider than a width of the deflecting surface, wherein at least one optical surface of at least one imaging optical element of the imaging optical system has a shape in the sub-scan section which shape is a non-arcuate shape including an aspherical coefficient of quartic or higher order, and wherein the aspherical coefficient of quartic or higher order changes in the main-scan direction and from a scan central portion of the imaging optical element to a scan end portion of the imaging optical element. | 01-08-2009 |
| 20090046344 | OPTICAL SCANNING APPARATUS AND IMAGE-FORMING APPARATUS - An optical scanning apparatus includes a light-source unit, an incident optical system for directing light beams emitted from the light-source unit to a deflecting unit, and an imaging optical system for guiding the light beams deflected from the deflecting unit to a surface to be scanned. The imaging optical system includes a toric lens whose power in the main scanning direction is different from that in the sub-scanning direction; the toric lens having the curvature centers of the meridians of a first toric surface connected to form a curved line located in a common plane Ha, and the curvature centers of the meridians of a second toric surface connected to form a curved line not located in a common plane. | 02-19-2009 |
