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 unit is disclosed. The light source unit includes a phase type optical element which modulates a phase distribution of laser beams emitted from a light source. The phase type optical element has a phase distribution so that a first ratio of the peak intensity of side lobe laser beams to the peak intensity of main lobe laser beams in a beam intensity profile at a focal position of the laser beam condensing element is greater than a second ratio of the peak intensity of side lobe laser beams to the peak intensity of main lobe laser beams in the beam intensity profile at the focal position of the laser beam condensing element when it is assumed that the phase type optical element is not disposed.

Abstract: A laser beam scanning device is disclosed. The laser beam scanning device includes a diffraction optical element which forms a pattern of a diffraction image including two images extending in a direction corresponding to the sub scanning direction and one image extending in a direction inclined by ? (0<?<90°) from the direction corresponding to the sub scanning direction by inputting a laser beam which is led to a surface of a photoconductor drum, and a light receiving element which receives the pattern of the diffraction image.

Abstract: An optical scanning unit includes a light source that emits a light beam, a light deflector that deflects the light beam from the light source, and a scanning optical system that focuses the light beam deflected by the light deflector on a scanning surface. The light beam from the light source is at an angle in a secondary scanning direction with respect to a normal to a reflecting surface of the light deflector. At least one surface of the scanning optical system does not have a curvature in the secondary scanning direction, being tilted and decentered in the secondary scanning direction.

Abstract: An optical scanning unit includes a light source that emits a light beam, a light deflector that deflects the light beam from the light source, and a scanning optical system that focuses the light beam deflected by the light deflector on a scanning surface. The light beam from the light source is at an angle in a secondary scanning direction with respect to a normal to a reflecting surface of the light deflector. At least one surface of the scanning optical system does not have a curvature in the secondary scanning direction, being tilted and decentered in the secondary scanning direction.

Abstract: An optical scanner includes a light source; a deflecting unit that deflects and scans a light beam emitted from the light source; a scanning optical system that focuses the light beam deflected and scanned onto different surfaces to be scanned; and a light quantity correcting unit that corrects a light quantity of the light beam. The light quantity correcting unit changes light quantity correction data used for correcting the light quantity of the light beam for each of the surfaces. The light quantity correction data is dependent on positions in a main scanning direction.

Abstract: An image forming device is disclosed that is able to correct an image distortion even when the installation environment changes or unexpected shocks occur and even when an optical scanning device is exchanged. The image forming device comprises a light source, an optical scanning unit, a development unit, a transfer unit, a test image output unit to output a test image able to determine unevenness of intervals of positions of beam spots formed on an image supporting member, a beam spot position correction unit to correct the unevenness of the beam spot position intervals, and a correction data input unit to select correction data of the unevenness of the beam spot position intervals.

Abstract: In order to provide a data processing technique for easily and suitably executing an integrating process for a plurality of image groups obtained successively from different directions against the object to be the base for generating a three-dimensional shape data of an object, while the object SB in a first posture placed on a rotary stage is being rotated, images of the object SB are successively photographed by a photographing device so that a first image group is obtained. The posture of the object SB is changed into a second posture, so that a second image group of the object SB is obtained similarly. Corresponding points Sp1, Sp2, Sp3 and the like of the object SB are specified on a partial first image extracted from the first image group and a partial second image extracted from the second image group. Conversion parameters of the first and second image groups are calculated from the information about the specified plural corresponding points, so that the integrating process is executed.

Abstract: In a beam-spot position compensation method for use in an optical scanning device which scans a surface of a photosensitive medium by a light beam emitted by a light source, a plurality of sections are defined by dividing a scanning region on the scanned surface. An emission timing of the light beam for every section is adjusted so that a spacing between beam-spot positions corresponding to pixels of start and end of each section is changed by a predetermined amount. The sparseness or denseness of beam-spot position spacings of the plurality of sections in the whole scanning region is compensated.

Abstract: An optical scanning unit includes a light source that emits a light beam, a light deflector that deflects the light beam from the light source, and a scanning optical system that focuses the light beam deflected by the light deflector on a scanning surface. The light beam from the light source is at an angle in a secondary scanning direction with respect to a normal to a reflecting surface of the light deflector. At least one surface of the scanning optical system does not have a curvature in the secondary scanning direction, being tilted and decentered in the secondary scanning direction.

Abstract: In order to generate three-dimensional form data having characteristic lines desired by a user from original three-dimensional form data, a closed surface consisting of longitudes and meridians is arranged so as to inscribe a three-dimensional form model, and the longitudes and the meridians are projected to a surface of the three-dimensional form to generate parametric curves running along the surface. Then, control points of the parametric curves are moved to adjust the curves so that a part of the parametric curves in correspondence to the movement of the control point moves along the surface of the form model. The curves adjusted are taken as three-dimensional form data of the form model.

Abstract: An optical scanning device has a light source, a unit configured to deflect a light beam from the light source; and a system including at least two scanning lenses and configured to guide the light beam deflected to a surface to be scanned. One of the scanning lenses closest to the deflecting unit has a positive refractive power in a main scanning direction and zero or approximately zero refractive power in a sub scanning direction, and another one of the scanning lenses closest to the surface has a negative refractive power in the main scanning direction, a positive refractive power in the sub scanning direction, and an incidence surface in the sub-scanning direction which is convex toward the deflecting unit.

Abstract: A scanning imaging lens includes at least two scanning lenses. Of the scanning lens, the scanning lens that is closer to a deflection unit is formed by resin molding, and has a positive refracting power in the horizontal scanning direction, with zero or close to zero refracting power in the vertical scanning direction, and has a function of correcting constant velocity characteristic in the optical scanning. The scanning lens that is closer to the surface to be scanned has a weak refracting power in the horizontal scanning direction and a strong positive refracting power in the vertical scanning direction, and the linearity Lin of the scanning imaging lens satisfies the condition 2.0<Lin<10.0(%).

Abstract: A measurement system is provided in which optimum measurement is conducted depending on an environmental change and movement of an object. The measurement system for measuring an object based on images obtained by plural cameras includes a positional control portion for controlling positions of the cameras to change photographing directions of the cameras, a two-dimensional measurement portion for conducting two-dimensional measurement of the object based on the image of the object, the image being obtained by at least one of the cameras, a stereoscopic measurement portion for conducting stereoscopic measurement of the object based on the images of the object, the images being obtained by the cameras, and a switching portion for switching between the two-dimensional measurement portion and the stereoscopic measurement portion to perform an operation.

Abstract: A scanning imaging lens includes at least two scanning lenses. Of the scanning lens, the scanning lens that is closer to a deflection unit is formed by resin molding, and has a positive refracting power in the horizontal scanning direction, with zero or close to zero refracting power in the vertical scanning direction, and has a function of correcting constant velocity characteristic in the optical scanning. The scanning lens that is closer to the surface to be scanned has a weak refracting power in the horizontal scanning direction and a strong positive refracting power in the vertical scanning direction, and the linearity Lin of the scanning imaging lens satisfies the condition 2.0<Lin<10.0 (%).

Abstract: When a scanning start position set signal is input in an area image sensor, the content is transferred to a vertical scanning circuit, and the scan start position is set. Image of a desired row is read by horizontal scanning. Then, one shift signal for vertical scanning is input, the position of scanning is shifted by one row, and horizontal scanning is performed. Thus image of the next row is read. By repeating this operation, a desired strip-shaped image is read. The shape of the object is determined and when a portion is determined to have complicated shape, the image data is input by means of a lens having long focal length, and image data of other portions are input by means of a lens having short focal length. By putting together a plurality of input image data, image data as a whole is generated.

Abstract: In order to provide a data processing technique for easily and suitably executing an integrating process for a plurality of image groups obtained successively from different directions against the object to be the base for generating a three-dimensional shape data of an object, while the object SB in a first posture placed on a rotary stage is being rotated, images of the object SB are successively photographed by a photographing device so that a first image group is obtained. The posture of the object SB is changed into a second posture, so that a second image group of the object SB is obtained similarly. Corresponding points Sp1, Sp2, Sp3 and the like of the object SB are specified on a partial first image extracted from the first image group and a partial second image extracted from the second image group. Conversion parameters of the first and second image groups are calculated from the information about the specified plural corresponding points, so that the integrating process is executed.

Abstract: An image recording and reproducing system includes a recording device having an image recorder for recording an image of a subject on a recording medium, a detector for detecting information about deterioration of the subject image recorded on the recording medium, an information recorder for recording the detected deterioration information, and a reproducing device having an image reproducer for reproducing the subject image, a calculator for calculating a function indicative of a deterioration characteristic of the recorded subject image based on the recorded deterioration information, and a corrector for correcting the recorded subject image in accordance with the calculated deterioration characteristic.

Abstract: When a scanning start position set signal is input in an area image sensor, the content is transferred to a vertical scanning circuit, and the scan start position is set. Image of a desired row is read by horizontal scanning. Then, one shift signal for vertical scanning is input, the position of scanning is shifted by one row, and horizontal scanning is performed. Thus image of the next row is read. By repeating this operation, a desired strip-shaped image is read. The shape of the object is determined and when a portion is determined to have complicated shape, the image data is input by means of a lens having long focal length, and image data of other portions are input by means of a lens having short focal length. By putting together a plurality of input image data, image data as a whole is generated.

Abstract: When a scanning start position set signal is input in an area image sensor, the content is transferred to a vertical scanning circuit, and the scan start position is set. Image of a desired row is read by horizontal scanning. Then, one shift signal for vertical scanning is input, the position of scanning is shifted by one row, and horizontal scanning is performed. Thus image of the next row is read. By repeating this operation, a desired strip-shaped image is read. The shape of the object is determined and when a portion is determined to have complicated shape, the image data is input by means of a lens having long focal length, and image data of other portions are input by means of a lens having short focal length. By putting together a plurality of input image data, image data as a whole is generated.