Abstract: In bi-directional imaging, such as bi-directional printing, a driving mechanism scans a light beam through a scan path across an imaging window. A controller enables transmission of video data to a modulator when the light beam is positioned for imaging on the imaging window. Video data is transmitted to the modulator when the light beam is traveling in a forward direction or a reverse direction across the imaging window, whereby a modulated light beam is capable of producing an image when traveling in the forward or reverse directions. The controller adjusts scan durations or image rasterization rates to ensure that each scan is properly aligned with the prior and subsequent scan.

Abstract: A scanning type image display apparatus includes a synchronization control circuit that enables a scanning unit to synchronize the forward paths and backward paths. The scanning type image display apparatus comprises a light source, scanning unit for scanning the light beam in two dimensional directions, a scanning optical system for forming an image of the light source on a surface to be scanned, the last surface of the scanning optical system including a reflecting area that reflects an effective light beam for forming an image on the surface to be scanned and a light transmission portion provided outside the reflecting area, light beam detection unit for detecting a light beam transmitted through the light transmission portion, and a synchronization control circuit that controls light emitting timing of the light source based on a signal from the light beam detection means.

Abstract: A light scanning apparatus includes a deflector having an oscillation mirror that oscillates about an axis that is orthogonal to a main scanning direction. A detector detects a scanning light beam deflected by the oscillation mirror and moving in a scanning region. A controller adjusts the amplitude of the oscillation mirror based on a detection signal outputted from the detector, and stops driving the oscillation mirror when the detection signal is not outputted from the detector.

Abstract: The optical system comprises a light source, a first optical element, a projecting lens, and an electromagnetic-wave sensor. Light from the light source passes the first optical element and the lens sequentially to reach a screen, and light reflected by the screen passes the lens and reaches the electromagnetic-wave sensor via the first optical element.

Abstract: An optical wavefront sensor comprising a light manipulation device; a detector for detecting light signals having been subjected to the light manipulation device; and a controller coupled to the manipulation device, the controller controlling the manipulation device to function as a lenslet array, each lenslet of the array focussing an incident portion of a wavefront onto the detector. The controller may also control the distance between the detector and the manipulation device. The spatial resolution of Shack-Hartmann sensors can be increased by digital scanning the wavefront with the manipulation device. The wavefront sensing can be dynamic adaptive by setting of parameters of the manipulation device.

Abstract: In a light (optical) beam steering/sampling system, a matrix inversion control technique is used to decouple the operation of the actuators which drive the steering mirrors. The control technique uses two virtual variables, each having an associated independent feedback loop operating in a non-cross-coupled manner, each variable being associated with one of the two steering mirrors.

Abstract: Apparatus and techniques are provided for modifying and measuring surfaces of diamond workpieces and other workpieces with nanoscale precision. The apparatus and techniques exploit scanning probe microscopy (SPM) and atomic force microscopy (AFM) at a wide range of operating temperatures. In some embodiments, the SPM/AFM apparatus also includes an interferometric microscope and/or acoustic-wave microscope for making high-precision measurements of workpiece surfaces.

Abstract: A drive for oscillating a reflector in a beam scanner, and for other similar oscillating devices, forms a feedback loop synchronized to the natural resonance of a resiliently movable flipper strip carrying the reflector. A magnet on the free end of the flipper generates a current in a sensing coil coupled to an amplifier upon passage of the magnet. The triggering signal is phase delayed by one or more integrators or timers, whereupon a driving current is generated, for example in a different winding on the same spool as the sensing coil. The driving current is applied at a phase delay that maintains oscillation up to a high operational frequency in a range. Synchronizing the drive to the natural frequency and phase of the flipper substantially reduces power consumption compared to forcing oscillation to a different reference.

Abstract: Apparatus and methods for operating an area scanner having a motorless scanning mechanism provide for enhanced operation of the area scanner. In an embodiment, an area scanner includes a micro-optical-electromechanical device to direct the scan of light from an optical source over a desired area.

Abstract: A system is provided to monitor a structure within an outer casing of a gas turbine engine. The system may comprise an optical fiber bundle, a fiber bundle palette and a camera palette assembly. The optical fiber bundle may have first and second ends. The first end is adapted to pass through a bore in the outer casing of the gas turbine engine so as to be positioned adjacent the structure within the gas turbine engine casing to be monitored. The fiber bundle palette is adapted to be located outside of the engine casing to receive the second end of the optical fiber bundle. The camera palette assembly comprises a fixture movable relative to the fiber bundle palette and a first camera mounted to the fixture. The first camera is adapted to be positioned adjacent to the second end of the optical fiber bundle so as to receive electromagnetic radiation received by the first end of and transmitted through the optical fiber bundle.

Abstract: In a wound scanning apparatus and method, a beam or sheet of light is scanned on a wound and reflections of the scanned beam or sheet of light interacting with the wound at a plurality of points thereof is detected. The detected reflections are processed into data representative of the wound. The data or a representation thereof is reproduced in a human understandable form.

Abstract: A method for optically detecting the position of a moveable test object (10), especially a mirror or reflector, in which a measuring beam (6) produced by a light source (2) is reflected by the test object (10 and reaches a position-sensitive light detector (12) which carrier out a conversion into information corresponding to the position of the test object (10). The invention enables the position of mirrors, especially rotating mirrors, to be quickly measured optically using a simple optical construction. The measuring beam (6) is focused onto the light detector (12) by an optical system (8). A signal corresponding to the geometric center or the maximum (I0) of the intensity distribution of the focused measuring spot is determined based on the measured values obtained by the light detector (12).

Abstract: The invention alters the light emission proportion of each of five LEDs for each of a plurality of accumulation cycles in a main scanning direction, in accordance with light emission conditions that are configured in the lighting condition register, causes the emission spectra of the multicolored illumination that composites the light emitted from the five LEDs to approximate three types of color-matching functions that are represented with CIEXYZ or other standard color space, and thus, use a sensor to convert the light that is illuminated by the five LEDs onto an original, and reflected therefrom, into an electrical signal.

Abstract: A radar device includes a light projecting part that generates laser light, a light projecting lens that converges the generated laser light to form a beam, a reflective mirror for reflecting the converged beam to project it in a specified search direction and for reflecting returning light from this search direction, a light receiving lens for converging the returning light reflected by the reflective mirror, and a scanning part for moving the beam in a scanning manner. There are two light receiving parts which are different in photosensitivity, and a synthesizing part outputs a synthesized signal formed by synthesizing output signals from these two light receiving parts.

Abstract: Method for correcting a control of an optical scanner (14) in a device for mapping of a sample (2; 2?) by scanning, said device guiding at least one beam path section (4?, 18?) of an illumination beam path of the device over the sample (2; 2?) from an illumination device (10) to the sample (2; 2?) and/or a mapping beam path of the device from the sample (2; 2?) to a determination device (10) of the device in order to obtain an image of the sample (2; 2?), generating control signals corresponding to a predetermined setpoint movement using parameters and/or a transfer function of the scanner (14) that are used for control and/or regulation and moving the at least one beam path section (4?, 18?) in response to the control signals, whereby in the method an image of a reference sample (2; 2?) having predetermined structures (36) mappable by the device is obtained by generating control signals corresponding to a predetermined setpoint test movement and moving the at least one beam path section (4?, 18?) in response

Abstract: A MEM s scanning device has a variable resonant frequency. In one embodiment, the MEMs device includes a torsion arm that supports an oscillatory body. In one embodiment, an array of removable masses are placed on an exposed portion of the oscillatory body and selectively removed to establish the resonant frequency. The material can be removed by laser ablation, etching, or other processing approaches. In another approach, a migratory material is placed on the torsion arm and selectively stimulated to migrate into the torsion arm, thereby changing the mechanical properties of the torsion arm. The changed mechanical properties in turn changes the resonant frequency of the torsion arm. In another approach, symmetrically distributed masses are removed or added in response to a measured resonant frequency to tune the resonant frequency to a desired resonant frequency. A display apparatus includes the scanning device and the scanning device scans about two or more axes, typically in a raster pattern.

Abstract: A measuring device and measuring method are provided for testing the cut quality of a sheet. The measuring device is provided with a transparent scanning substrate for holding the sheet, a scanning device with a scanning window, and a cover for covering the sheet held by the scanning substrate, wherein the scanning window overlaps the sheet, forming edge regions, and the cover has different reflection properties from the sheet for producing a high-contrast scanned image of the sheet and of the edge regions between the sheet and the scanning window. The measuring method includes positioning the sheet on a transparent scanning substrate, covering the sheet with a cover, and scanning the sheet with a scanning device, wherein the scanning device scans in the region of a scanning window which encompasses both the sheet and edge regions surrounding the sheet, and differences in contrast between the sheet and the edge regions are detected.

Abstract: A method for scanning a surface, consisting of focusing an array of optical beams using optics having an axis, so as to illuminate a region of the surface intercepted by the axis, such that each optical beam illuminates a portion of a respective sub-region within the region. The method further includes moving at least one of the array and the surface so as to cause a translation of the surface relative to the axis in a first direction. During the translation in the first direction, each of the optical beams is scanned over the respective sub-region in a second direction, which is different from the first direction.

Abstract: A composite laser beam is swept as a pattern of scan lines on a projection surface, and selected pixels arranged along each scan line are illuminated to project an image of high quality and in color. A data frequency of a video signal supplied by a host is matched to a scan frequency of a scan mirror to reduce the amount of buffer memory required and to make the projected image brighter and more uniform in brightness.

Abstract: A method for scanning a surface, consisting of focusing an array of beams using optics having an axis, so as to irradiate a region of the surface intercepted by the axis, such that each beam irradiates a portion of a respective sub-region within the region. The method further includes moving at least one of the array and the surface so as to cause a translation of the surface relative to the axis in a first direction. During the translation in the first direction, each of the beams is scanned over the respective sub-region in a second direction, which is different from the first direction.

Abstract: The present invention measures jitter in a galvano scanner that scans a light beam on a surface to be scanned by periodically turning a reflection mirror in a reciprocating manner. Two detectors for detecting and receiving the light beam are mounted near both ends of the scan region of the light beam, a first detection signal of each of the two detectors is extracted whenever the reflection mirror is activated for one scanning, a required time for one scanning is computed from the extracted detection signals, and a variation in the required time for each scanning is measured based on the computed required time.

Abstract: A light scanning apparatus makes a light beam scan along a main scanning direction on an effective scanning region having a predetermined width. A deflector includes an oscillation mirror which deflects the light beam and makes the light beam scan a second scanning range which contains but extends beyond a first scanning range corresponding to the effective scanning region A detector detects the scanning light beam which moves through a position outside the first scanning range but within the second scanning range, and outputs a detection signal A controller drives the oscillation mirror based on the detection signal and accordingly adjusts the amplitude of the oscillation mirror, and stops driving the oscillation mirror when the detection signal is not outputted from the detector even though a light source is turned on to emit the light beam.

Abstract: An imaging system (30, 30?) and corresponding method has a two-dimensional imaging sensor array (32) and an associated optical system. The optical system includes at least one optical arrangement (34, 36?, 36b) defining a field of view (38a, 38b) of given angular dimensions and an optical switching mechanism (40) for alternately switching an optical axis of the imaging system between two directions (42?, 42b). The optical switching mechanism and the optical arrangement(s) are deployed such that the imaging sensor array generates images of at least two generally non-overlapping fields of view of equal angular dimensions and with diverging optical axes in fixed spatial relation. Rapid switching between the fields of view allows quasi-continuous monitoring of a larger field of view than would otherwise be possible while maintaining sensitivity to transient events. Also disclosed is an infrared search and tracking system based on such imaging systems.

Abstract: Disclosed is a method for analyzing biological samples by means of a scanning microscope. According to said method, at least one screen dot is repeatedly and successively illuminated with a manipulating light beam and an exciting light beam. The interval between the time of illumination with the manipulating light beam and the time of illumination with the exciting light beam is modified, and the fluorescent light yield is measured in accordance with said interval.

Abstract: An image forming apparatus includes a latent image forming unit in which a light beam scans in a second scan region wider than a first scan region. The light beam is modulated in accordance with an image signal within the range of the first scan region for every scanning cycle and guided onto the effective image region to form a line latent image. A write timing adjuster adjusts a write start position for writing a latent image along the main scanning direction, based on a time difference between a first detection signal output when a first light beam scanning away from the effective image region moves passed an optical sensor, and a second detection signal output when a second light beam scanning toward the effective image region moves passed the optical sensor.

Abstract: Disclosed herein is an apparatus for adjusting applied voltage in a display system using a diffractive optical modulator. The apparatus for adjusting applied voltage can measure the intensity of diffracted light emitted from the diffractive optical modulator, and adjust voltage to be applied to the diffractive optical modulator based on measurement results.

Abstract: A multibeam type scanning microscope that has N beams, wherein the system is devised so that the respective beams perform scanning in LM stages in the Y direction at maximum magnification where the discrete scanning direction is the Y direction, thus performing scanning in an area of N×LM stages overall, and scanning is controlled so that the following processes (1) and (2) are successively repeated LK times at a magnification that is 1/LK times the maximum magnification. Here, L, M and N are integers of 2 or greater, and K is a natural number. (1) The respective beams perform scanning in the Y direction at a sampling interval that is LK times that at the maximum magnification. (2) When scanning of LM-K stages is completed in the Y direction, and the repetition is less than the LKth time, the scanning skips ((N?1)×LM-K+1) stages.

Abstract: A contact image sensor is provided including a housing, a slit plate a lens, one or two light sources and a light-receiving element array mounted on a light-receiving element array substrate. The housing contains the slit plate, the lens, the one or two light sources and the light-receiving element array substrate. The optical system of the contact image sensor is aligned and one or more depressions are formed on an end of the substrate for the alignment. Power to the one or two light sources is applied through one or more leads. Each of the one or more depressions is large enough so that each of the leads can be passed through the respective depressions.

Abstract: A light scanning device, including a light source including plural light emitting elements arranged linearly, a deflection section that deflects plural light beams emitted from the light source to scan a surface to be scanned, a photosensor that receives at least one of the plural light beams that are deflected by the deflection section, a signal generation section that generates a signal when a light energy amount received at the photosensor reaches a predetermined amount, and a control section that starts scanning of the surface to be scanned by each light beam after a predetermined amount of time passes from a point in time when the signal is generated by the signal generation section, the light receiving surface of the photosensor being inclined to receive light beams emitted from at least two light emitting elements among the plural light emitting elements, is provided.

Abstract: For irradiating a layer (3) a radiation beam (7) is directed and focused to a spot (11) on the layer (3), relative movement of the layer (3) relative to the optical element (59) is caused so that, successively, different portions of the layer (3) are irradiated and an interspace (53) between a surface of the optical element (59) nearest to the layer (3) is maintained. Furthermore, at least a portion of the interspace (53) through which the radiation irradiates the spot (11) on the layer (3) is maintained filled with a liquid (91). By directing a gas flow (71-73) to a surface zone (74) of the layer (3), liquid (91) is reliably prevented from passing that surface zone (74), without causing damage to the layer (3). The liquid (91) is drawn away from the layer (3) in the vicinity of the surface zone (74).

Abstract: A printer has a laser emitter for emitting a laser beam to irradiate a surface of a photosensitive member; a reflector, disposed at a position on a laser beam path defined by the laser emitter and the photosensitive member, for reflecting the laser beam emitted by the laser emitter to direct the reflected laser beam to a target position on the surface of the photosensitive member; a reflective mirror driver for reciprocating the reflector in such a manner that the laser beam travels along a scanning line on the surface of the photosensitive member in a direction for scanning; and an emission controller for controlling the laser emitter to selectively emit the laser beam along the scanning line in the forward direction or the backward direction defined by the movement of the reflector driven by the reflective mirror driver.

Abstract: There disclosed is an image display apparatus having a light source, a scanning member for deflecting a light from the light source to scan a predetermined surface with the light to form a two-dimensional image thereon, a first optical system for guiding a light deflected by the scanning member to the predetermined surface and a second optical system for guiding a light from the two-dimensional image formed onto the predetermined surface to an observer. There exists, in optical paths of the first optical system and the second optical system, a common optical element with a plurality of optical surfaces including refractive surfaces and reflective surfaces formed on a same medium and the first optical system and the second optical system share a part of optical surfaces of that optical element.

Abstract: A scanning optical microscope including: a light source; a lens for altering the cross-sectional shape aspect ratio of a beam of light emitted from the light source; at least one lens for converging beams of light of different cross-sectional shape aspect ratio to create a linear light; a first light modulation member able to impart shade to the converged linear light; a lens that can form the light to which the shade has been imparted as a parallel light; a scanning member that can alter the angle of illumination; a lens for focusing the light to which the shade has been imparted; an objective lens for projecting the light to which the shading has been imparted to a sample body; and a lens for imaging the reflected light from the sample body or the light generated by the sample body on to a sensor.

Abstract: A light source control method and apparatus of an image scanner is disclosed. The invention utilizes a determination means and an illumination control device to perform partial or full illumination and adjust brightness so that the light source can be operated more efficiently and more economically.

Abstract: A composite laser beam is swept as a pattern of scan lines on a projection surface, and selected pixels arranged along each scan line are illuminated to project an image of high quality and in color. A data frequency of a video signal supplied by a host is matched to a scan frequency of a scan mirror to reduce the amount of buffer memory required and to make the projected image brighter and more uniform in brightness.

Abstract: A method is described for scanning image pixels in a sequence which, in contrast to the traditional and ubiquitous raster scan, groups effectively adjacent and neighboring image pixels together in the scanned sequence, resulting in a much lower bandwidth signal and data stream, and leading directly to bandwidth and storage gains from compression and exploitation of image redundancy. M-Scan, for meandering scan, is synthesized by iterative application of a simple primitive pattern, and analyzed by iterative partitioning. M-Scans achieve unbroken continuity between pixels in the image, and in routine application never need to step between non image adjacent pixels. Whereas a conventional raster has a low vertical and a high horizontal deflection scan rate, M-Scan has intermediate and equal vertical and horizontal rates, and no large jumps related to flyback. An M-Scan signal power spectrum has no comb at the line rate.

Abstract: Process for the observation of at least one sample region with a light raster microscope by a relative movement between the illumination light and sample via first scanning means along at least one scanning axis essentially perpendicular to the illumination axis wherein the illumination light illuminates the sample in parallel at several points or regions and several points or regions are detected simultaneously wherein at an angle to the plane of the relative movement, preferably perpendicular thereto, second scanning means are moved and an image acquisition takes place by the movement of the first and second scanning means being coupled and a three-dimensional sampling movement being done by the illumination of the sample wherein the second scanning means are coupled to the movement of the first scanning means in such a manner that straight and/or curved lines and/or plane and/or curved surfaces are scanned which are extended along at least one scanning direction of the first scanning means as well as along

Abstract: A scanning system for a printer or scanner that has a beam source that produces a light beam at a point of origin and has a scanning mirror that sweeps the light beam from a position “A” to a position “B.” A lens receives the light beam from the scanning mirror and directs the light beam as a scanning beam to an image plane surface. A first synchronizing mirror intercepts and reflects a light ray to a photo detection system when the scanning beam is at a position “A?” that is in the vicinity of position “A” and between position “A” and “B”. A second synchronizing mirror intercepts a light ray when the scanning beam is at a position “B?” that is in the vicinity of position “B” and between position “A” and “B”, and reflects the light ray to a folding mirror that reflects the light ray to the photo detection system. In some configurations two photo detection systems are used in lieu of the folding mirror.

Abstract: An optical scanner for three-dimensional scanning comprises: a support bed; a flat, transparent plate; guide rails under the transparent plate; a carriage slidably attached to the guide rails; and one or more sensors attached to the bed/case or carriage. For three-dimensional imaging, multiple scanned images of the object are obtained, each of which is from light reflecting off the object at a different angle with respect to the path of the carriage. This is done by shining light on the object and appropriately channeling reflected light, from at least two different directions, into the sensor(s). In one embodiment, the carriage has three CCD sensors, one oriented rearwards (with respect to the path of travel of the carriage), one oriented vertically, and one oriented forwards—each effectively “sees” the object from a different orientation. The multiple scanned images can be used for stereoscopic viewing and/or three-dimensional rendering using a computer.

Abstract: An optical scanner is disclosed which includes: a reflective surface from which incoming light is reflected; a scanning mechanism altering a reflective-surface angle of the reflective surface, relative to an entry direction in which the incoming light enters the reflective surface, to thereby scan reflected light from the reflective surface; and a controller controlling an intensity of the incoming light, depending on the reflective-surface angle.

Abstract: Evanescent wave scattering by a scanning probe in a scanning probe microscope is utilized to determine and monitor separation between a scanning probe and a sample. A laser light is totally internally reflected at the interface between a more optically dense (incident) medium and less optically dense (transmitting) medium, exciting a decaying evanescent field in the less optically dense medium. A scanning probe, such as a colloidal probe, is dipped into the evanescent field, which scatters off the scanning probe. The portion of the scattered field propagates back into the incident medium and is then detected by a detector. A dependency between the intensity of the scattered evanescent field and the separation between the probe and the incident medium was measured and used in determining the separation. This dependency of intensity is used to prepare images or maps of interfaces. A particular application of determining the separation between the probe and the sample in an atomic force microscope is disclosed.

Abstract: A system and method for independently controlling the collimation and lateral positioning of a light beam comprises at least one acousto-optic deflector and a pair of counter propagating acoustic waves with offset frequencies. While the frequency offset controls the lateral positioning of the light beam, a frequency gradient across the acousto-optic deflectors controls the collimation of the light beam.

Abstract: A panoramic field of view acquiring system comprises three telescopes, which acquire three separate images, each typically covering a little over one third of the total required scene and a multiplexer, which is used to transmit the three images, one at a time, to an appropriate detector. Standard imaging techniques are then used to coordinate the images to form a complete picture and display them as required.

Abstract: A mounting structure for an inverter circuit board for a light source lamp of an image reader in which mounting means for mounting the inverter circuit board for a light source lamp of an image reader onto a carriage is located to be operated from the direction in which the carriage moves in one embodiment. The inverter circuit and heat dissipation plate are removably mounted to an end of the full rate carriage. In another embodiment, the circuit board is mounted to the top for access from above the carriage.

Abstract: An optical scanning system including a resonant oscillating device having a first magnetic field and a mirrored surface. The system includes first and second light sources for directing first and second beams of light to the mirrored surface of the resonant oscillating device to provide first and second reflected scan beams. The second reflected scan beam is offset a first distance from the first reflected scan beam. A second magnetic field is included for interacting with the first magnetic field to provide torque to the resonant oscillating device for scanning the first and second reflected scan beams across a surface to provide first and second scan lines on the surface substantially simultaneously as the resonant oscillating device oscillates under the influence of the first and second magnetic fields. The optical scanning system is effective to increase scan efficiency of the resonant oscillating device over that of a system using a single light source.

Abstract: Apparatus and techniques are provided for modifying and measuring surfaces of diamond workpieces and other workpieces with nanoscale precision. The apparatus and techniques exploit scanning probe microscopy (SPM) and atomic force microscopy (AFM) at a wide range of operating temperatures. In some embodiments, the SPM/AFM apparatus also includes an interferometric microscope and/or acoustic-wave microscope for making high-precision measurements of workpiece surfaces.

Abstract: An optical system is disclosed which has a small size as a whole and capable of suppressing loss in the light amount in a separating member even when a relatively large-sized scanning device and a reflective diffusing member are used. The optical system comprises a scanning optical system including a scanning device which scans a light flux from a light source at a scanning point and a display optical system which leads an image formed by the scanned light flux to an exit pupil of the optical system. An optical path of the scanning optical system and an optical path of the display optical system have a mutually overlapping part, and the optical paths are separated by a separating member. The scanning optical system forms a conjugate point conjugate with the scanning point at substantially a position of the separating member.

Abstract: In the scanning optical apparatus, a light source including one or more of the plurality of light emitting points of the light source device, and a synchronism detecting device constituting the synchronism detecting device are provided on one and the same substrate, the substrate is designed to be rotatable in a plane perpendicular to the direction of an optical axis of the incidence optical device, an optical element constituting the synchronism detecting device is disposed on a light incidence side of the synchronism detecting device, and the optical element is designed to be rotated in synchronism with the substrate when the substrate is rotated.

Abstract: A printing apparatus 10 exposes an image onto a photosensitive medium 14, having a printhead 20 with a linear array of exposure sources 40, each exposure source 12 operable at a variable intensity. A shuttle mechanism 16 moves the printhead 20 over the photosensitive medium 14 in a reciprocating motion between one end of a carriage assembly 72 and the other. An encoder 38 is coupled to the shuttle mechanism (16) for providing an index encoder pulse 60 at each of a plurality of increments of position of the shuttle mechanism 16 along the carriage assembly 72. Exposure control logic calculates a shuttle velocity according to index signal timing and adjusts the variable intensity of each exposure source 12 according to the shuttle velocity.

Abstract: A mounting apparatus for an optical sensor, applied to an optical scan module. A screw pile with a filet slot head, a washer and a screw nut are used to mount the base plate of the charged-couple device to the main body. Therefore, it is easy to adjust the skew in the direction parallel to the base plate of the charged-couple device and the depth of focus.