Abstract: A system for scanning an imaging plate, comprising: a continuous belt drive; a first scanning head mounted to the belt drive; a second scanning head mounted to the belt drive; and a laser positioned to direct a laser beam in a beam path across the imaging plate, wherein the continuous belt drive is positioned to sequentially move each of the first and second scanning heads in a path collinear with the laser beam path when moving across the imaging plate.

Abstract: For the purpose of calibration which is simple and can also be carried out as often as desired, an arrangement and a method for calibrating a preferably confocal laser scanning microscope, it being possible for an object (1) to be scanned by a scanning beam (2), are defined by calibration means (12) which are arranged in the plane of an intermediate image (11) and can likewise be scanned by the scanning beam (2).

Abstract: A scanning probe microscope assembly (100) that has an atomic force measurement (AFM) mode (137), a scanning tunneling measurement (STM) mode (138), a near-field spectrophotometry mode (143), a near-field optical mode (151), and a hardness testing mode 195 for examining an object.

Abstract: A color optical microscope having first optics that converges laser light on a sample by means of an objective lens and relatively scans the laser light across the surface of sample. The reflection of the laser light is received by a light-receiving element and a second optics that irradiates the sample with white light so that its reflection is received by a color two-dimensional imaging device. Color picture signals are produced by combining the luminance information from the first light-receiving element in the first optics with the color information from the color two-dimensional imaging device in the second optics.

Abstract: In a radiation image read-out apparatus, a line stimulating light beam is projected onto a stimulable phosphor sheet, and stimulated emission emitted from the irradiated portion of the stimulable phosphor sheet is detected by a line sensor. A refractive index profile type lens array is disposed between the stimulable phosphor sheet and the line sensor. The photoelectric convertor elements of the line sensor and the refractive index profile type lenses of the refractive index profile type lens array are arranged at pitches such that the frequency band of the periodic pattern generated due to the pitches of the refractive index profile type lenses in said refractive index profile type lens array are higher than the frequency band of a radiation image information reproduced on the basis of the image signal.

Abstract: The integrating cavity effect is reduced by using a polarizing filter. The polarizing filter reduces the secondary illumination onto a document being scanned. The filter is placed at the opening to the cavity of the scanner. The sum effects of using a polarizing filter reduces the integrating cavity effect by a factor of 2.

Abstract: An optical scanner utilizes two linear CCD detectors and a bandpass means to improve the ability of the scanner to discriminate against specular reflection. A coded symbology is illuminated by a noncoherent light source and light reflected from the coded symbology along a first path strikes the front face of the bandpass means. The bandpass means, functioning as a notch filter, transmits a select bandwidth of light while reflecting all other light onto a first CCD detector. Simultaneously, light reflected from the bar code symbol travels along a second path, at a different angle with respect to the plane of the coded symbology than the first path, is reflected from a mirror onto the back face of the bandpass means. The bandpass means transmits the select bandwidth of light onto a second CCD detector and reflects all other light. The second CCD detector has a notch filter which permits the detection of only the select bandwidth.

Abstract: A radiation image read-out apparatus includes a stimulating light beam source, and a photodetector which receives stimulated emission emitted upon exposure to the stimulating light beam from portions of the stimulable phosphor sheet exposed to the stimulating light beam or the back side of the sheet opposed to the portions exposed to the stimulating light beam and converts the amount of stimulated emission to an electric signal. The photodetector comprises a CCD provided with a protective member which is permeable to light in the wavelength band of the stimulated emission and impermeable to light in the wavelength band of the stimulating light.

Abstract: A system for scanning objects having a linear array sensor, adapted to detect light input signals, is provided. A lens is optically connected to the linear array sensor, and is adapted to receive and transmit an optical image located in a field of view along a lens axis to the linear array sensor. A light source which generates an illumination stripe in general linear alignment with the lens axis is provided. A cylindrical lens is positioned between the light source and an object to be scanned. The cylindrical lens adapted to collect, transmit and focus light from the light source to form the illumination stripe.

Abstract: An optical scanning device of a type having a scanning optical system for deflecting scanning beams bearing image information of a common subject image which includes a polygon mirror and an ƒ&thgr; lens comprises a scanning beam separation mirror for separating the scanning beams in different directions and a pair of first and second reflection mirrors provided for each scanning beam, the first and second reflection mirrors being disposed on opposite sides, respectively so that the scanning beam travels across an axis of the scanning optical system. The optical scanning device is additionally provided with a scanning beam detector which provides a start signal for commencement of a scan timely when detecting the scanning beam directed toward a position immediately before a given scanning area.

Abstract: An optical scanning system for a printer includes an optical scanning unit having a deflector divided into a plurality of deflection regions to allow repetitive scanning of light emitted from a light source by rotation, the optical scanning unit for scanning light onto a photosensitive belt traveling around a plurality of rollers; a first photodetector installed at a position separated from the edge of the photosensitive belt, to be able to receivable light scanned beyond the edge of the photosensitive belt; a second photodetector installed a predetermined distance apart from the first photodetector, to be able to receive light scanned just beyond the edge of the photosensitive belt until the light hits the edge of the photosensitive belt; a scanning reference position signal generator for generating a scanning reference position signal at a point in time at which a signal output from the first photodetector in response to the reception of light, and a signal output from the second photodetector in response t

Abstract: A synchronous light detector for an optical scanning apparatus comprises a cylindrical lens 14 and a light-receiving device 15. The cylindrical lens 14 is disposed between an imaging lens 8 of the optical scanning apparatus and the light-receiving device 15 so as to have a generator direction parallel to a scanning direction of a light beam. The light-receiving surface of the light-receiving device 15 is disposed at a position shifted from a paraxial image point P in the direction orthogonal to the scanning plane of the light beam by a predetermined distance &Dgr; along the optical axis direction of the light-receiving device 15 when the deflecting point of the light beam caused by a polygon mirror 6 is taken as an object point. As a consequence, the synchronous signal of the optical scanning can be detected correctly even when there is a flaw or dirt on the light-receiving surface.

Abstract: A mounting assembly for an optical scanner includes a base unit with a hole for receiving a post of a rotor unit that includes a laser light source that emits light towards a bar code symbol or other object that reflects the light to a collector also mounted on the rotor unit. Flexures connect the base unit to the rotor so that the post and hole arrangement limits translational movement of the rotor unit due to a shock force applied to the optical scanner. The flexures may be use to transmit power signals to the rotor unit and to provide monitoring signals from the rotor unit.

Abstract: Confocal microscopic equipment that can photograph confocal images at high speed and with good signal to noise ratio, wherein the equipment obtains confocal images by rotating a disk having a plurality of apertures and by scanning a sample on which light beams passing through the apertures are focused; and comprising a light source, an optical microscope, a high speed camera that photographs confocal images, a high speed confocal scanner that scans a sample with an output light beam from the light source via the optical microscope, and outputs the return light from the sample to the high speed camera, and a memory that stores confocal images photographed with the high speed camera on a real time basis.

Abstract: The present invention provides an excitation source which may be used, for example, in conjunction with the scanning of multi-channel electrophoresis chips or capillary arrays. The excitation source is comprised of a source of light, such as a laser beam. A beam expander, an acousto-optic deflector, and a filter are optically aligned with the source of light. A driver is connected to the acousto-optic deflector for controlling the angle of deflection. A system is disclosed which includes the excitation source, a detector for detecting fluorescence from a target chip, and a beam splitter or other device for optically connecting the excitation source to the chip and for optically connecting the chip to the detector. The excitation source may be based on an acousto-optic deflector, an electrooptic deflector, a piezoelectric deflector, or any other electronically controlled device.

Abstract: An image forming apparatus includes a plurality of light sources emitting beams of light, a photoconductor, a scanner for reflecting the beams of light emitted by the light sources to scan the photoconductor periodically, a light detector for receiving the beams of light from the scanner to determine a beam pitch between the beams of light, the light detector being provided in a part of an optical path between the scanner and the photoconductor, a beam shifter for shifting the beams of light incident on the scanner from the light sources, and a controller for operating the beam shifter so that the beam pitch determined by the light detector becomes a predetermined value.

Abstract: An optical reader for reading optical indicia which includes an imaging element for forming an image of the optical indicia at an image plane. The optical reader further includes an aperture positioned at the image plane and having a width smaller than the width of a smallest element in the image to be discerned by the optical reader, the aperture permitting illumination from a portion of the image to impinge upon a photodetector. The optical reader further includes a displacement system which produces relative movement between the image and the aperture to produce an output of the photodetector indicative of the optical indicia.

Abstract: An image forming apparatus records an image on a recording medium by scanning the recording medium with a plurality of beams modulated according to individual information signals. A beam detect device detects the plurality of beams arriving at respective predetermined positions and generates a plurality of beam detect signals corresponding to the plurality of beams, respectively, and a beam detect signals separating device separates the plurality of beam detect signals into individual beam detect signals. An image formation start timing for each beam is controlled according to each beam detect signal separated from others by the beam detect signals separating device.

Abstract: Determinations of velocity and navigation of an imaging device relative to a region of interest are based on double correlation processing. A time series of images of detectable features within the region of interest is acquired and correlated with previously stored location information for uniquely distinguishing locations within the region of interest. Thus, one correlation step is to compare the positions of features within the time series with the previously stored location information. The other correlation step is to track the variations in positions of the features within the time series. Preferably, the imaged features that are used for correlation are randomly distributed. However, in some applications, a known systematic distribution of features may be used. The processing is applicable to hand scanning, robotic control, and similar operations.

Abstract: A light beam is made to scan and expose a photosensitive drum in the main scanning direction and the passing position of the light beam in the sub-scanning direction is sensed. On the basis of the result of the sensing, the light beam is shifted in the sub-scanning direction when the beam is made to scan by a scanner so that the passing position may come in a target range, which brings the passing position to the proper position. After the position control, the passing position of the light beam is confirmed and controlled so that the passing position may fall on the proper position a specific number of times consecutively. When the light beam is shifted in the sub-scanning direction, the passing position of the light beam is brought into a final target range in such a manner that the target range is forced to converge stepwise in a first range and then in a second range narrower than the first range.

Abstract: An imaging system including a one-piece aluminum internal drum casting having reduced weight and increased stiffness. The internal drum is mounted to the frame structure of the imaging system using a plurality of mounts positioned in a plane substantially along the center of gravity of the internal drum. The mounts reduce the amount of sway of the internal drum within the frame structure.

Abstract: Scanner apparatus may comprise a housing having a front side with an opening therein, a back side with an opening therein and a scanning device mounted within the housing. A transparent platen mounted within the opening in the front side of the housing allows an object positioned adjacent the scanning device so that the object may be thereafter scanned. A transparent window mounted within the opening in the back side of the housing allows a user to view at least a portion the object positioned adjacent the transparent platen.

Abstract: A dual mode document aperture imaging prevention system and document edge location system, using the same digital document imager, for imaging different sizes of moving document sheets, some of which may have punched notebook or binder holes or other apertures. Both a black or substantially light absorbing imaging background surface area and a white or substantially light reflective imaging background surface area are automatically selectably provided in the same document imaging station as document backing surfaces for the two respective functions. The dark imaging background is automatically provided to be illuminated and imaged for document edge detection, and the light imaging background may be selected to be automatically provided for illuminating and imaging the body of the document to prevent imaging any apertures of any apertured document sheets.

Abstract: A multi-beam scanning device in which generation of differences in scanning speed and curved image planes among a plurality of beams is prevented and pitch adjustment for the plurality of beams in the sub-scanning direction can easily be performed. Cylindrical lenses are provided on respective optical paths extending from a plurality of light sources to a beam splitter, and positions of the cylindrical lenses are adjusted by optical path correcting mechanisms for adjustment of position of the respective beams in the sub-scanning direction. A sensor section receives the respective beams to output to a control circuit a detection signal corresponding to a light receiving position. The control circuit drives an optical path correcting drive circuit based on a predetermined threshold and the output signal to control actions of the optical path correcting mechanisms.

Abstract: A device for taking aerial motion pictures, includes a camera (3) disposed at the upper end of a vertical periscopic tube (2) whose lower end (1) projects below a carrying airplane. An optical device is provided, adapted to effect vertical sweeping by pivoting about a horizontal axis. The periscopic tube (2) can pivot about its vertical axis and the camera (3) can pivot coaxially relative to the periscopic tube (2). The periscopic tube (2) is carried by a first turning plate (41) mounted rotatably on a fixed plate (40) and driven in rotation by a motor (43), whilst the camera (3) is carried by a second turning plate (51) mounted for rotation on a second fixed plate (50) and driven in rotation by a second motor (53).

Abstract: A scanning reader of an optical code placed on a front wall of an article in movement comprises generators that form at least one first and one second light beam lying on planes inclined by a first and by a second prefixed angle (.alpha., .beta.) with respect to the front wall so as to explore a first and a second area of the front wall by at least one first and one second scanning line and read the optical code within an overall distance range, along the direction of forward movement of the article, greater than the useful range of reading distance that can be reached by one light beam only.

Abstract: An image reading apparatus is provided which includes a cold-cathode tube as a light source for illuminating a document sheet, an inverter for providing the light source with driving power. A connection cable is used for electrically connecting the light source to the inverter. The image reading apparatus also includes three kinds of rows of light receiving elements arranged in the primary scanning direction for detecting the light reflected on the document sheet. A lens array is provided for focusing the reflected light at the respective rows of light receiving elements. The light receiving elements are mounted on a printed circuit board. The light source, the inverter, the lens array and the printed circuit board are supported by a single case of the image reading apparatus.

Abstract: A linear illumination device of the present invention includes: a guide made of a light transmitting material extending in a first direction, having a side face and at least one end face; at least one light emitter for allowing light to enter interior of the guide from the at least one end face of the guide; and a light diffusing section formed on part of the side face of the guide, for diffusing the light incident thereon, wherein at least part of the light entering the interior of the guide goes out from part of the side face of the guide facing the light diffusing section, thereby providing substantially linear illumination light along the first direction.

Abstract: A hand-held optical scanning device includes a body portion with an optical scanner module at a first forward end and having a keypad and display mounted on an upper surface. The handle portion extends from the body portion near the forward end and is oriented at a selected angle to cause a second rearward end of the bottom surface of the body portion to rest on the radial surface of a user's hand when a user grips the handle. The hand-held optical scanning device is further provided with a resilient seal interposed between the body portion and upper handle portion which functions to provide a ready made stand for the device.

Abstract: A light intensity control apparatus includes an optical beam splitter which splits light into monitor light and principal light; a polarization beam splitter which splits the monitor light into two polarized light components; a monitor light detector which detects the polarized light components; a polarization correction device which corrects the output of the monitor light detector so that the intensity of the output signal of the monitor light detector and the light intensity of the principal light on an object surface have a predetermined correlation, regardless of the polarization state of the light incident upon the optical beam splitter; and a humidity dependency correction device which corrects the output of the monitor light detector via the polarization correction device by detecting a variation in polarization dependency characteristics of the optical beam splitter, caused by a change in humidity, and feeding the variation back to the polarization correction device, so that the output signal intensi

Abstract: In a light raster scanning system imaging a medium located on a movable stage and using bidirectional scanning, i.e. scanning during stage movement in two opposing directions, the problem of chevron artifacts (angle errors), due to the different stage movement directions, is overcome by a system of reflective optics including two optical elements dynamically movable relative to one another. One of the optical reflective elements is tilted or rotated relative to the other to compensate for the angle error causing the chevron artifacts. The amount of this tilt is dynamically altered depending on the direction of stage travel and also may be dynamically adjusted to maintain linearity of the scan pattern in spite of any other irregularities in stage velocity. Also an autofocus feature is provided, whereby the two reflective elements are moved relative to one another to dynamically alter the focus of the light beam onto the medium and hence overcome any defocus problems due to irregularities in the medium surface.

Abstract: A laser beam optical scanning device which focuses and scans a laser beam emitted from laser diode 1 in the arrow b direction on a photosensitive drum 40 via focusing lens 3, polygonal mirror 6, and f.theta. lens 7. The scanning laser beam enters a convergence state detector 10, which detects the amount of dislocation of the convergence position. The amount of positional change is calculated to correct the convergence position based on the detected amount of dislocation, and the focusing lens 3 is moved on the optical axis of the lens via motor 21 to correct the beam convergence position. When processing is executed to correct the convergence position in the intermediate zone of the image formign range and the calculated amount of positional change exceeds a limit value, a detection error is assumed, and the focusing lens 3 is moved an amount less than the limit value.

Abstract: A synchronizing light beam applied to a reference grating passes through the reference grating as a pulsed synchronizing light beam, which is converged by a convex entrance surface of a light guide rod onto a rear surface thereof. The synchronizing light beam is then diffused and reflected by a diffusion surface on the rear surface, and applied to photodiodes on respective opposite ends of the light guide rod. The photodiodes converts the applied light to a synchronizing signal.

Abstract: An image scanner includes a base, a glass plate disposed on the base for receiving a document to be scanned, a transmitting stand disposed in the base and being capable of moving laterally therein, a top shell disposed above the base and engaged with the transmitting stand and an optical sensing unit disposed in the top shell, so that the image scanner can directly scan the document and effectively obviate the optical error problem which occurs when a glass plate is located between a document to be scanned and an image sensor as in the prior art.

Abstract: The present invention provides a housing comprising a rectangular transparent planar board for placing documents to be scanned and a rectangular case for placing a scanning module. The housing comprises a plurality of clasps for fixing the transparent planar board within a flatbed scanner and comprises front, rear, left and right ends. The case comprises four upright sides and a rectangular opening installed above the four upright sides for mounting the transparent planar board. The opening comprises front, rear, left and right sides. The left and right sides of the opening each comprises an L-shaped groove for mounting the left and right ends of the transparent planar board, respectively. The front and rear sides of the opening each comprises a clasp for mounting the front and rear ends of the transparent planar board.

Abstract: A housing for a portable scanning device is described having a front side and back side, with a scanning device sized to fit within the housing. A transparent platen located on the front side of the housing allows an object positioned adjacent the transparent platen to be scanned by the scanning device. A window located on the back side of the housing allows a user to view at least a portion the object positioned adjacent the transparent platen.

Abstract: A scanner includes a photodetector, and encoder and an exposure control. For each line of pixels detected by the photodetector, the exposure control starts the exposure time and then stops the exposure time after a specified amount of relative motion has been detected. Thus, variations in the amount of relative motion cause inversely proportional variations in the exposure time to ensure that exposure time for each line of pixels corresponds to the same displacement. The exposure control can compensate for unavoidable position and velocity errors encountered in a dc motor drive and thereby allows a dc motor drive to be used in low cost commercial scanning products.

Abstract: A control system for a scanner is disclosed, especially for a laser scanning microscope, with an oscillating motor for driving an oscillating mirror serving for the linearly oscillating deflection of a beam bundle, with a control unit for supplying the oscillating motor with an exciting current which is variable with respect to the control frequency, frequency curve, and amplitude, with a function generator which is connected with the control unit, and with a measurement value transducer for obtaining a sequence of information about the deflection positions of the oscillating mirror.The measurement value transducer is connected with the function generator by way of a logic unit for determining correction values for the exciting current. Accordingly, it is advantageously possible, by evaluating the information supplied by the measurement value transducer about the actual deflection position of the oscillating mirror, to determine correction values with the assistance of the logic unit.

Abstract: A system and method for correcting a scan pattern of a moving optical scanning system. A gantry moves an optical system at a constant rate in a first direction. Using a light source and a first deflector, the optical scanning system quickly sweeps a light beam in a direction orthogonal to the motion of the gantry by changing the angle of deflection of the first deflector linearly with time. To compensate for the motion of the gantry, the optical system includes a second deflector which deflects the light, the deflection angle being determined as a function of the velocity of the gantry. The deflected light is focussed on the object (or pattern). Accordingly, the object is scanned along a corrected scan line orthogonal to the X-axis. The optical scanning system may optionally perform "selected" scanning. Also, the optical system optionally employs a "look-ahead/look-behind" scanning approach to further improve the rate at which portions of an object (or pattern) may be inspected.

Abstract: A scanning microscope includes a multiple point source producing device for producing a plurality of point sources arranged in an orderly array or focal points equivalent thereto; a scanning device for scanning in small regions into which the point sources or the focal points are divided; a plurality of minute apertures located at positions conjugate with the point sources or the focal points; a light-receiving device composed of a plurality of light-receiving elements for independently receiving light transmitted through the minute apertures; and a specimen image producing device for forming an image of a specimen in accordance with the amount of deflection caused by the scanning device and a signal received by the light-receiving device. In this way, the scanning microscope in which illumination efficiency is good and a real-time observation can be made is provide.

Abstract: There are proposed light beam scanning method and device for scanning with plural light beams split by using a multi-frequency acousto-optic device (AOM). By remarkably increasing the number of light beams, an image is recorded at a higher speed. Plural incident light beams are split in the subsidiary scanning direction by different multi-frequency acousto-optic devices. The split light beams are displaced so as not to overlap one another in the subsidiary scanning direction, while respective sets of light beams split by the acousto-optic devices are deviated in a main scanning direction, for scanning. The deviation in the main scanning direction is compensated with a clock timing of an image signal. The light beams split by the AOMs may be alternately positioned in the subsidiary scanning direction. Alternatively, a set of light beams split by one AOM may be adjacent to a set of light beams split by another AOM in the subsidiary scanning direction.

Abstract: In a digital copying mechine using a multi-beam optical system, first light receiving elements of a light beam detector placed on the extension of the surface of a photosensitive drum detects the positions of paths of scanning light beams in the sub-scanning direction. On the basis of the results of this detection, the amount of control for the position of the path of each light beam is calculated. Galvano mirrors, adapted to reflect the light beams onto the surface of the photosensitive drum, are driven accordingly, so that the paths of the light beams are properly positioned in the sub-scanning direction. Second light receiving elements of the light beam detector detect times at which the light beams move across the light beam detector. A sync clock is produced after a delay from when each light beam moves across the light beam detector.

Abstract: An optical scanner reduces the effects of external electrical noise and disturbing light that leaks therein during an image read operation. Light beams emitted by a plurality of light sources are synthesized so as to travel along a common optical path, the synthesized light beams are deflected by a polygonal rotating mirror and condensed. The condensed light beams fall on a beam splitting device. One of the light beams is projected on the image forming surface of a photosensitive member for image recording, another light beam scans the image surface of a document, and light scattered by the light reflecting from the image surface of the document is detected by photoelectric devices. The light beam projected on the document is modulated by a modulator in accordance with a fixed frequency, and signals provided by the photoelectric devices are demodulated by a demodulator.

Abstract: A hand held optical scanning device having a body portion with an optical scanner module at a first forward end and having a keypad and display mounted on an upper surface. The handle portion extends from the body portion near the forward end and is oriented at a selected angle to cause a second rearward end of the bottom surface of the body portion to rest on the radial surface of a user's hand when a user grips the handle. The hand held optical scanning device is further provided with a resilient seal interposed between the body portion and upper handle portion which functions to provide a ready made stand for the device.

Abstract: A laser drawing apparatus is used to draw a pattern on a surface of a workpiece by scanning the workpiece surface with at least one laser beam and by modulating the laser beam on the basis of raster-graphic data in accordance with a series of clock pulses. In the apparatus, a detector detects a dimensional variation of the workpiece in a scanning direction of the laser beam with respect to a corresponding standard dimension of an ideal workpiece. A calculator calculates a degree of variation the dimension of the workpiece and the corresponding standard dimension of the ideal workpiece. A regulator serves to cyclically shift a phase of the clock pulses by a unit of less than 2.pi., whereby the pattern to be drawn on the workpiece is dimensionally varied, in accordance with the degree of the dimensional variation of the workpiece.

Abstract: A laser beam transmitting system is provided comprising at least one target, a laser detection module, an optical system, a rotary encoder, a dither zone memory, and a controller. The optical system is arranged to generate a reference laser beam selectively in one of a search mode and a target dither mode and to direct a laser beam reflected from the target to the laser detection module. The search mode is characterized by movement of the reference beam through a rotational arc defined about a central rotational axis and the target dither mode is characterized by movement of the reference beam through a selected discrete portion of the rotational arc. The rotary encoder is arranged to produce a rotary signal indicative of a rotary position of the reference beam relative to the rotational arc.

Abstract: A laser beam scanning optical apparatus which images and scans a laser beam emitted from a laser diode on a photo-sensitive drum through a focusing lens, a polygon mirror and an f.theta. lens. An SOS photosensor detects the scanned laser beam and generates a detection signal. The laser diode is controlled to perform pulse emission a specified time after the generation of the detection signal. The pulse beam is incident to a beam detector which adopts a knife edge method, and the amount of a focal shift is detected. The focusing lens is moved along the optical axis in accordance with the detected amount of a focal shift to correct the position of the image point.

Abstract: A system and method which enables the location and orientation of an image to be determined without introducing scanning artifacts into the rendered image. The system utilizes a separate set of sensors on a scanning bar that are sensitive to a wavelength of light outside the range of wavelengths of the typical sensors found on the scanning bar, such as red, green, or blue. Moreover, the system includes a light source which is capable of emitting the wavelength of light that is outside this range of wavelength of light. Thus, whenever the additional set of sensors detect light, the system would determine that the light was due to a scanning artifact, such as a hole, rip, or dog ear in the original document being scanned.

Abstract: An optical write apparatus includes a light source unit, a first image-forming optic, a beam deflector, a transparent plate, a second image-forming optic, and a photosensitive body, the transparent plate being provided at a predetermined angle .alpha. with respect to a main-scanning direction on a scanned surface so that charge is built up evenly on the scanned surface.

Abstract: A scanning optical device includes a light source unit, a deflector for deflectively scanning a light beam from the light source unit, a photodetector, and a compound optical system. In the compound optical system, a first optical system for guiding the light beam from the light source unit toward the deflector, and a second optical system for guiding the light beam deflectively scanned by the deflector toward the photodetector are integrally formed. The compound optical system is so held as to be movable in a direction other than an optical axis direction of the first optical system.