Abstract: A medical image processing apparatus reducing noise of a medical image acquired includes a smoothing unit forming a smoothed image of the medical image, a route forming unit forming a route that is a pixel group positioned continuously in the smoothed image and fulfills a route condition, and a noise reducing unit extracting a pixel group corresponding to the route in the medical image and reducing noise of the medical image based on the extracted pixel group.

Abstract: A display panel and an operation method thereof are disclosed. In the display panel, a second light-emitting device is configured to emit a second light ray to the non-display side, and a second photosensitive element is configured to allow the second light ray to be incident therein and detect the second light ray. A first light-emitting device and the second light-emitting device are configured to emit a first light ray to the display side, and a first photosensitive element is configured to allow the first light ray reflected by an external object to be incident therein and detect the reflected first light ray. The second light ray is of a type different from that of the first light ray.

Abstract: In a light scanning device, a substrate equipped with a polygonal mirror is disposed astride an interior section and an exposed section of a housing. The substrate is provided with a separator that comes into contact with a front face thereof. The separator separates the substrate into a first region disposed in the interior section and a second region disposed in the exposed section. The polygonal mirror is provided in the second region of the substrate.

Abstract: An image display device according to the exemplary embodiment includes: an RGB laser diode that outputs a light beam; a laser driver that drives the RGB laser diode based on input image data; a scanning mirror that scans the light beam by reflecting the light beam at an angle according to a drive voltage; and a scanner control unit that applies a bias voltage to the scanning mirror based on an angle with respect to a horizontal plane, or a static angle of the scanning mirror that is at a standstill when the drive voltage is not applied.

Abstract: A laser beam irradiating mechanism of a laser processing apparatus includes: a pulsed laser oscillator configured to oscillate a pulsed laser beam; a condenser configured to condense the laser beam oscillated from the pulsed laser oscillator, and irradiate a workpiece held on a chuck table with the condensed laser beam; a polygon mirror disposed between the pulsed laser oscillator and the condenser, and having a plurality of mirrors arranged concentrically with respect to a rotating shaft, the plurality of mirrors dispersing the pulsed laser beam oscillated from the pulsed laser oscillator; and a guiding unit disposed between the pulsed laser oscillator and the polygon mirror, the guiding unit guiding the pulsed laser beam such that the pulsed laser beam is not applied to an angular portion of mirrors adjacent to each other.

Abstract: An image forming apparatus includes: a polygon mirror formed with a plurality of reflection surfaces, and a generating device configured to generate a pulse signal required to modulate a laser beam based on image data. The generating device is further configured to generate a pulse signal by inserting or deleting a pulse signal having a width smaller than a width of a pulse signal corresponding to one pixel of the image data into or from a pulse signal corresponding to the image data based on information associated with deviation amounts between lengths of scanning lines formed by the plurality of reflection surfaces and a reference value, so as to adjust the lengths of the scanning lines formed by the plurality of reflection surfaces to be closer to the reference value.

Abstract: An optical scanning device includes a light-source unit that emits a plurality of light beams, a deflector that deflects the light beams, and an image-forming optical system that receives the light beam deflected by the deflector and forms a spot image on photoconductors. The image-forming optical system includes a first scanning lens that allows only a corresponding light beam to pass and is arranged to form, upon receiving a virtual light beam, the spot image on the photoconductor with a not-curved line. The virtual line lies between a pair of light beams that travels in one of areas separated by a reference plane that is parallel to a sub-scanning direction and on which a normal line to a deflection plane of the deflector falls.

Abstract: There is provided an image forming apparatus comprising: detection means for detecting position information indicating a scanning position; interval prediction means for predicting a first scanning line interval indicating a distance in the sub-scanning direction between the scanning line of interest and a succeeding scanning line to be scanned after the scanning line of interest; interval calculation means for calculating, by using the position information held by the holding means, a second scanning line interval indicating a distance in the sub-scanning direction between the scanning line of interest and the scanned scanning line; and rate calculation means for calculating a correction rate on an exposure amount for the scanning line of interest so that a predicted density calculated using the first scanning line interval and the second scanning line interval matches with a predicted density calculated using a predetermined reference scanning line interval.

Abstract: A visible laser beam scanned by a galvano-scanner system is aligned at each of positioning points on the top surface of a master work by manual operation to record sensor position signals of position sensors on galvano-scanners. The sensor position signals on each positioning point are recorded to create a drive pattern in accordance with recorded sensor position signals. The drive pattern no longer has optics system error sources including focus error and attachment error as well as errors caused by scale, offset and the like, also eliminating the need for entering a distance as far as the top surface of the work. Therefore, the drive pattern with error components removed can be created with ease.

Abstract: An optical scanning unit includes a light source including a plurality of light-emitting elements; a light detector to detect a light beam emitted from the light source; a light-flux splitter, angled to the optical axis of the light beam emitted from the light source, having an aperture, a portion of reduced thickness susceptible to warping, a concave face of the warped light-flux splitter as a reflecting face, and a convex face of the warped light-flux splitter opposite the concave face as a non-reflecting face; and a light-flux splitter pressing unit to press the light-flux splitter onto a light-flux splitter holding member without blocking the aperture. Light beam passed the aperture is used as a write-use light flux. The reflecting face reflects a light flux other than the write-use light flux as a monitor-use light flux. The light-flux splitter pressing unit presses a portion of maximum convexity of the non-reflecting face.

Abstract: An optical scanning device includes a light source which emits a light beam, a deflector, an incident optical system and one scanning lens. The deflector reflects and deflects/scans the light beam emitted from the light source. The scanning lens includes a first face facing the deflector and a second face on an opposite side to the first face, and performs imaging of the deflected/scanned light beam on a surface to be scanned. In a main scanning cross section, when an angle relative to an optical axis of an incident light beam which enters the scanning lens from the first face is ?in, and an angle relative to an optical axis of an outgoing light beam which is output from the second face toward the surface to be scanned is ?out, in an entire scanning region, a condition of 0.9<?in/?out<1.3 is satisfied.

Abstract: An optical scanning apparatus includes a light source, rotational polygonal mirror, correction data calculating unit, modification computing unit, and adjustment unit. The adjustment unit adjusts drive current supplied to the light source using the correction data calculated by the correction data calculating unit when a first of a plurality of modes is selected or using the correction data calculated by the modification computing unit when a second of the plurality of modes is selected.

Abstract: An image reading device includes: a light source which generates light used for reading an image; a light guide prism which extends in a main scanning direction and guides the light from the light source toward an image reading region; a holding unit which is connected to a part of the light guide prism to hold the light guide prism, has a wall surface distant from at least one end surface of the light guide prism at a position facing the end surface of the light guide prism in the main scanning direction, and has a linear expansion coefficient smaller than that of the light guide prism; and an image sensor which photoelectrically converts reflected light from the image reading region and outputs image data corresponding to the read image.

Abstract: A rectangular plate optical reflecting mirror is provided in an optical scanner. The optical reflecting mirror reflects an optical beam onto a surface to be scanned. The optical reflecting mirror includes a center portion and end portions in a longitudinal direction. The center portion has a greater thickness than that of the end portions. Accordingly, rigidity of the optical reflecting mirror can be increased, and its characteristic frequency can be set at a high value. Thus, resonance of the optical reflecting mirror can be prevented from occurring as a result of vibration of a housing which vibrates with a plurality of vibration modes.

Abstract: A method for imaging using a flatbed imaging system includes providing first imaging data to a first imaging source; providing second imaging data to a second imaging source; imaging a first beam from the first imaging source at a first height on a rotating multi-facet spinner; imaging a second beam from the second imaging source at a second height on the rotating multi-facet spinner; distributing the first beam on a first location on a printing plate; and distributing the second beam on a second location on a the printing plate.

Abstract: Raster Output Scanners and printing systems are presented along with methods for mitigating banding in printing systems, in which electronic banding compensation is employed using cross-process direction light source intensity banding correction profiles tailored to corresponding reflective facets of a rotating polygon.

Abstract: An optical scanning apparatus capable of suppressing a track error is provided. The apparatus includes a swing mirror supported by a torsional vibration system having a first natural frequency and a second natural frequency that is a double of the first natural frequency, and a driving unit applying a swing torque to the vibration system. The apparatus can detect passage of an optical beam at two locations and output track information of the swing mirror, and perform feedback control. When the feedback control is performed, the apparatus sequentially switches target tracks of scanning in a forward and a backward direction, the phases of the second natural frequency of the target tracks being mutually reversed, calculates an amount of offset compensation based on a difference between the predetermined target track and the track for each scanning in the forward and backward direction, and reflects the amount in the feedback control.

Abstract: A light scanning apparatus comprises a light source unit, a deflection unit, an incident optical system, and an imaging optical system including a transmission type imaging optical element and a reflection optical element are provided. A light beam deflected for scanning by the deflection unit passes through the imaging optical element in order of a first and a second transmission surfaces, and then passes through the imaging optical element again a third and fourth transmission surfaces. The first and fourth transmission surfaces of the imaging optical element are different in shape from another in the sub-scanning direction. Respective components are set so that, in a sub-scanning section, the light beam deflected for scanning is turned back by the reflection optical element and refracted/diffracted at the first transmission surface in a direction in which a reflected light beam passes through the third transmission surface, and that predetermined Conditional Expression is satisfied.

Abstract: An optical scanner includes: a light source; a light deflector configured to deflect a light beam from the light source in a main scanning direction; a scanning lens through which the light beam having been deflected by the light deflector passes; a beam detector configured to detect the light beam; a mirror disposed between the light deflector and the scanning lens in an optical axis direction of the scanning lens and configured to reflect the light beam having been deflected by the light deflector toward the beam detector; and a wall portion configured to cover one end face of the mirror that faces the scanning lens, wherein the surface of the wall portion facing the scanning lens is tilted with respect to a sub-scanning direction orthogonal to the main scanning direction.

Abstract: A light source unit includes a holder, a light source, coupling lens, and a support member. The light source is supported by the holder and projects a light beam against a target. The coupling lens adjusts an optical axis of the light beam. The support member contacts the holder and the coupling lens to fix the coupling lens in place on the holder after the coupling lens adjusts the optical axis of the light beam. The holder and the coupling lens are adhered to the support member using an adhesive agent. An optical scanner includes a rotary deflector to deflect and scan the light projected from the light source unit, a scan optical element to focus the light deflected by the rotary deflector, and the light source unit. An image forming apparatus includes the optical scanner.

Abstract: An image reader includes a light source, a light reception element, an optical member, and a hold body. The light source applies light to a document. The light reception element receives reflected light reflected by the document. The optical member introduces the reflected light into the light reception element. The hold body has an entry part which is disposed in a portion not contributing to image formation of the reflected light on the light reception element through the optical member. The hold body holds the optical member.

Abstract: An optical scanning device includes a light source, an optical system, and a housing. The light source projects a light beam. The housing includes a holder and encloses the optical system. The optical system includes a liquid crystal element held by the housing via the holder, to modulate a phase of the light beam projected from the light source against a scanned surface. The liquid crystal element includes a plurality of substantially transparent substrates, a liquid crystal layer, and a sealing member. One of the plurality of the transparent substrates has a size larger than any other transparent substrates and is positioned in the holder. The liquid crystal layer is sandwiched between the plurality of substantially transparent substrates. The sealing member seals the liquid crystal layer between the plurality of substantially transparent substrates.

Abstract: The invention has an image forming apparatus with a deviation amount calculator for obtaining, by an arithmetic operation, by an arithmetic operation, the deviation amount between the laser beam irradiating positions for each color, under the condition that the deviation amount increases gradually according to a time lapse in at least one of the plurality of operating modes, according with a further time lapse, the deviation amount between the laser beam irradiating positions for each color decreases gradually, and according with a further time lapse, the deviation amount between the laser beam irradiating positions for each color is converged.

Abstract: A scanning optical device includes a rotating polygonal mirror having a plurality of reflecting faces. A first light source emits a first light beam from one section obtained by sectioning the scanning optical device with a plane passing through the rotation axis of the rotating polygonal mirror. A second light source emits a second light beam from the other section. The first calculation unit calculates scan time of the first light source. The second calculation unit calculates scan time of the second light source. The jitter correction unit corrects jitter by controlling a pixel clock supplied to the first light source according to the scan time of the second light source. The jitter correction unit also corrects jitter by controlling a pixel clock supplied to the second light source according to the scan time of the first light source.

Abstract: An optical scanner includes an optical housing, which houses a light source, an aperture stop, a condensing lens and a rotary deflector, light from the light source entering into the rotary deflector via the aperture stop and the condensing lens, and the light deflected by the rotary deflector scanning a target to be irradiated, a fastener, which fastens the condensing lens to the optical housing, and a fastener attachment portion to which the fastener is attached, the fastener attachment portion being disposed in a downstream side of the condensing lens in a traveling direction of the light in the housing.

Abstract: An image scanning apparatus arranged to press an original document placed on a glass plate by a platen cover and to scan the original document by a line sensor includes a light source used when scanning image information, a first detection sensor arranged to detect as a first timing a state in which the cover is opened at, for example, an angle of 20 degrees, a second detection sensor arranged to detect as a second timing a state, for example, that is immediately before the cover closes the glass plate, and an original document size determining unit arranged to determine the size of the original document based on the differential data, which is calculated from first image information scanned at the first timing and second image information scanned at the second timing.

Abstract: An image forming optical equipment is disposed between a polygon mirror and the surface of a photoreceptor drum to form an image on the surface of the photoreceptor drum with scanning light, while at the same time, keeping its scanning speed nearly-constant, comprises a first scanning light lens, which has a positive power in the main scanning direction and a negative power in the sub-scanning direction, a second scanning light lens, which has a negative power in the main scanning direction and a positive power in the sub-scanning direction and is disposed in the side closer to the photoreceptor drum than the first scanning light lens, and a diffraction optical element, which is provided on the surface of the cylindrical lens in the beam light advancing path between a light source and a polygon mirror.

Abstract: A color image forming apparatus obtaining a high quality color image with little write start misregistration among optical scanning devices, includes a plurality of optical scanning devices respectively including an incident optical unit guiding a light beam from a light source unit to a deflection unit, an imaging optical system allowing the light beam deflectively scanned by the deflection unit to be focused on a scanned surface, and an optical system for synchronous detection for adjusting image start timing on the scanned surface by using a part of the light beam deflectively scanned by the deflection unit. A ratio of a focal length of the optical system for synchronous detection to a focal length of the imaging optical system is set appropriately in a main scanning section of the plurality of optical scanning devices for obtaining a black color image and color images other than the black color image.

Abstract: In an image forming apparatus, an energy converting unit receives light from an optical source and converts the light into electric power, and an electrical storage unit stores therein the electric power. The energy converting unit is arranged in such a manner that a relative position of the energy converting unit to the optical source is always constant when a reading unit is reading an image.

Abstract: A structure for holding an optical component, includes: first and second flat plate portions provided in a state where the portions stand on a base plate, opposed to each other in a state where the flat plate portions are coupled to each other, and constituting first and second hierarchies, respectively; first and second positioning portions that are provided at the first flat plate portion, and that determine positions of directions of first and second coordinate axes of first, second, and third coordinate axes that intersect with each other; a third positioning portion that is provided at the second flat plate portion, and that determines a position of a direction of the third coordinate axis of the first, second, and third coordinate axes that intersect with each other; and a holding portion coupled to the first flat plate portion or the second flat plate portion, and holding the optical component.

Abstract: An image forming apparatus including: a user interface unit to display a user interface to select one or more low noise modes to reduce noise produced during a print standby state and a printing state of the image forming apparatus; and a controller to control the driving of a laser scanning unit and to control a print speed, according to one or more of the selected low noise modes selected through the user interface. Therefore, noise generated in the print standby state, and/or the printing state, are reduced, according to a low noise mode selected by a user.

Abstract: An optical scanning device includes an input optical system having an input optical element, for projecting a light beam from a light source device onto a deflecting surface of an optical deflector, and an imaging optical system having an imaging optical element, for imaging the light beam scanningly deflected by the deflecting surface of the optical deflector, on a surface to be scanned, wherein the light beam is obliquely incident on the deflecting surface in a sub-scan section, wherein the imaging optical element has at least one optical surface which is decentered in the sub-scan section, wherein the input optical element has at least one optical surface having an asymmetric and aspherical surface shape, wherein the input optical element has a thickness dm1 in the sub-scan section and at a position where a first marginal light ray of the light beam passing through the input optical system, which first marginal light ray is closer to an optical reference axis than the principal ray of that light beam is, p

Abstract: An illuminating device includes a linear light source mounted on a mounting surface of a board, with a plurality of light-emitting elements being arrayed thereon, for irradiating light toward an illuminating target, a white reflecting surface provided in a planar shape parallel to an optical axis of the linear light source on a surface including the mounting surface, to reflect the light from the linear light source, and a mirror surface formed in a planar shape that reflects the light from the linear light source and reflected light from the white reflecting surface. The linear light source, the white reflecting surface, and the mirror surface are arranged such that a third plane crosses a first plane on the illuminating target side than a second plane, and 0°<?W<?R<90° is satisfied.

Abstract: In an optical scanning apparatus, the shape of a sub-scanning section of a transmissive imaging optical element on which a light beam subjected to scanning and deflected by a deflecting surface of an optical deflector is incident twice, the tilt angle of a reflective optical element disposed in an optical path between the optical deflector and a surface to be scanned, and the relationship between the transmissive imaging optical element and the reflective optical element are provided.

Abstract: A device, apparatus, and method of controlling operation of scanning performed by an optical scanning device are disclosed such that the color images are not shifted in the sub-scanning direction even when thinning processing is performed.

Abstract: An imaging apparatus for fully automatic screen printer including two stacked light sources, two stacked beamsplitters, two stacked optical reflectors, two stacked imaging lens and two stacked image sensors, wherein the two stacked optical reflectors and the two stacked light sources are correspondingly disposed on two different sides of the two beamsplitters, the two stacked imaging lens are disposed on another side of the beamsplitters different from that of the optical reflectors and the light sources, the two stacked image sensors are disposed behind the imaging lens; the optical reflectors are provided with an upward reflection plane and a downward reflection plane, the optical axes of the imaging lenses are orthogonal to that of the light sources. The imaging apparatus is of two independent optical paths which capture the image of the printed circuit board and that of the screen respectively.

Abstract: An optical scanning apparatus is detachably mountable in an image forming apparatus. The optical scanning apparatus includes a light source unit to simultaneously emit a plurality of light beams; an optical element unit including an optical element to focus light beams deflected by the optical element onto a surface to be scanned, and hold the light source unit in a rotatively adjustable manner; and a rotation adjustment unit to adjust a position of the light source unit relative to the optical element unit in a rotation direction when an external force acts on the rotation adjustment unit. The rotation adjustment unit is disposed at a rear end of the optical scanning apparatus in an inserting direction to the image forming apparatus or at an adjustable position when the optical scanning apparatus is installed in the image forming apparatus.

Abstract: For an image-capturing unit having a light source and mirrors directing light reflected from a scanned document into a lens condensing the light onto a photoelectrically converting image sensor, a synthetic resin housing. The housing is composed of an open-ended upper frame having a top plate from which sidewalls extend, encompassing an internal space. A mounting surface for anchoring the light-source is formed on the upper side of the upper-frame top plate, and formed on the lower side of the upper-frame top plate is a pedestal on which the lens is supported. Mirror-support projections are formed on the lower side of the upper-frame top plate, or on the upper-frame sidewalls, to support the mirrors from below the lens. With this housing, the influence of heat from the light source on the optics is minimized, improving the mirrors' positional accuracy.

Abstract: An optical scanning apparatus which includes: a light source unit which emits a light beam; a deflection scanning device which deflects the light beam emitted from the light source unit; an optical scanning unit having a scanning imaging lens and which scans a surface to be scanned; and a light beam detector which detects a position in a sub-scanning direction of the light beam, and is disposed in a position maintaining a correlation, in a time-varying characteristic, between an amount of change of a position in the sub-scanning direction of the light beam on the surface to be scanned and an amount of change of a position in the sub-scanning direction of the light beam detected by the light beam detector, in which a difference between the amount of change of the position in the sub-scanning direction of the light beam on the surface to be scanned and the amount of change of the position in the sub-scanning direction of the light beam detected by the light beam detector is equal to or less than a set value.

Abstract: A light-source drive control unit divides each pixel of the image data into a plurality of subpixels, deletes certain subpixels from the image data in accordance with predetermined correction data, shifts remaining subpixels in the sub-scanning direction thereby obtaining reduced image data, and controls a plurality of light sources based on the reduced image data in such a manner that one line of the subpixels is formed with a light beam emitted from a corresponding one of the light sources.

Abstract: An image sensor includes a light source; a bar-shaped light-guiding element having a first light-emitting section, which propagates light from the light source and irradiates an document from an oblique direction, and a second light-emitting section emitting light in a carrying direction of the document; a lens converging the light reflected from the document; a sensor receiving the light passed through the lens; a reflector disposed on the opposite side of the light-guiding element, by reflecting the light from the second light-emitting section such that an optical path of the light emitted from the second light-emitting section is located between the lens and the document, and irradiating the document from an oblique direction; and first and second light-scattering layers formed in areas opposed to the first and the second light-emitting sections, respectively, in the light-guiding element.

Abstract: An optical scanning device of the invention includes: n-odd (n?2) light sources disposed at different positions at least in a sub scanning direction; a light source driving control part configured to control a light emitting state of the light source; and a sub-scanning pixel position detecting part configured to depict one pixel with m-odd (n?m?2) light sources of the n-odd (n?2) light sources and to detect a deviation in position of the one pixel in a sub scanning direction, wherein the light source driving control part is configured to correct the deviation in position of the one pixel in the sub scanning direction at a resolution equal to or higher than a density of the pixel, depicted with the m-odd light sources, by controlling the light emitting state of the m-odd light sources on the basis of a result of detection with the sub-scanning pixel position detecting part.

Abstract: An imaging optical system for imaging imagewise information provided on a surface of an original, upon a surface of an image pickup device such that the imagewise information is read based on signals from the image pickup device, the imaging optical system including four off-axial reflection surfaces which are asymmetric within a sub-scan section, wherein, when a combined power, in a main-scan direction, of two off-axial reflection surfaces of said four off-axial reflection surfaces which are optically close to an original side is denoted by Mf and a combined power, in the main-scan direction, of two off-axial reflection surfaces of the four off-axial reflection surfaces which are optically close to an image pickup device side is denoted by Mr, relations ?0.3<Mf/Mr<0.3 and 0<Mr are satisfied.

Abstract: An optical scanning device is provided which comprises a laser array which emits laser beams including a number of beams (1, 2, . . . , n) writing a swath of rasters having a laser scanning section which, when an interlaced scanning period i, is set to a natural number between beams which are adjacent in a sub-scanning direction, scans the laser beams emitted from the laser array with the interlaced scanning period i. The laser scanning section can scan the laser beams such that the beam number n and the interlaced scanning period i are relatively prime natural numbers, and n>i. In a first scan, data for raster lines (1, 2, . . . , n) can be selectively associated with a respective first exposure. At a second scan, data for raster lines (i+1, i+2, . . . , n) can be selectively associated with a respective second exposure and data for raster lines (n+1, n+2, . . . , n+i) can be selectively associated with a respective first exposure. The first respective exposure for raster lines (i+1, i+2, . . .

Abstract: An optical scanner has an oscillation-type optical scanning mechanism which includes a movable member which resonates at a predetermined resonance frequency, a drive signal generator which generates a drive signal for allowing the movable member to resonate at the resonance frequency, and an oscillation signal generator which generates an oscillation signal in response to a change of the radiation direction of the light beams. Here, the oscillation signal generator includes a dot clock generator which generates a dot clock which becomes the reference of time-series processing by setting a frequency of the oscillation signal as a reference frequency.

Abstract: This invention is an optical scanning apparatus comprises a plurality of beam generating units adapted to generate beams; an optical unit adapted to collimate axes of the beams generated by the plurality of beam generating units to scan at intervals corresponding to a recording direction along a image bearing member; a detection unit adapted to detect a beam interval between the plurality of beams collimated by the optical unit; a driving unit adapted to change the beam interval by driving the optical unit; a first control unit adapted to drive/control the driving unit so as to make the detected beam interval become a predetermined value; and a second control adapted to drive/control the driving unit in accordance with a rotation position of the image bearing member.

Abstract: A light scanning apparatus is provided that has plural light sources which scan plural light beams in a main scanning direction. The light scanning apparatus comprises a light source control unit that controls the plural light sources. Where an array of N (N?2) light sources aligned in a sub scanning direction and capable of scanning different positions in the sub scanning direction is called a virtual light source array, and where L (L?2) virtual light source arrays aligned in the sub scanning direction are formed, the light source control unit causes M ((N?1)?M?1) light sources out of the N light sources of each of the L virtual light source arrays to emit light to form a pixel and thereby to form a total of L pixels aligned in the sub scanning direction by giving the same data to the M light sources of each of the L virtual light source arrays.

Abstract: To provide a scanning optical apparatus, not requiring a lens in a complex figure, and also, capable of eliminating the bow of a beam light even when a plurality of correcting lenses are in an identical figure. Beam light L falls on Cross section K perpendicular to Rotational axis 1a of Polygon mirror 1 at an angle of 2° or less. When such an incident angle condition is satisfied, the figure of a cross section in the sub scanning direction of Scanning lens 9 is a spherical surface figure, and also, the curvature of Incident surface 9a and Outputting surface 9b with respect to the sub scanning direction is changed according to the position in the main scanning direction. Furthermore, Correcting lens 10 is arranged in a tilted (decentered) state with respect to the light axis of Beam light L.

Abstract: A document reader includes a document feeder conveying a document along a document conveyance path, a first image reader reading an image formed on a first side of the conveyed document, and a second image reader reading an image formed on a second side of the conveyed document. Each of the first and second image readers is of an optical reduction system constituted of a light source, a mirror, a lens and an image sensor. The second image reading means is unified into a single assembly including at least the mirror, the lens and the image sensor, to be thus detachably attached, as a single unit, to the document feeding means. Thus, the document reader can clearly read the images formed on the first and second sides, it requires a short period of time from image reading to image outputting, and its maintenance is readily conducted.

Abstract: An image sensor includes a light source; a bar-shaped light-guiding element having a first light-emitting section, which propagates light from the light source and irradiates an document from an oblique direction, and a second light-emitting section emitting light in a carrying direction of the document; a lens converging the light reflected from the document; a sensor receiving the light passed through the lens; a reflector disposed on the opposite side of the light-guiding element, by reflecting the light from the second light-emitting section such that an optical path of the light emitted from the second light-emitting section is located between the lens and the document, and irradiating the document from an oblique direction; and first and second light-scattering layers formed in areas opposed to the first and the second light-emitting sections, respectively, in the light-guiding element.