Minolta Company, Ltd.

Konica Minolta Business Technologies, Inc.

Konica Minolta, Inc.

Tohoku University

Yoshihiro Inagaki

Akiyoshi Hamada

Toshio Naiki

Makoto Ooki

Kazuki Ikeda

Daisuke Kobayashi

Keiji Ogoh

Mohdmakhtar Nurnabila

Daichi Suzuki

Yoshiyuki Toso

Nobuo Kanai

Jun Kohsaka

Kenji Takeshita

Koichi Hashimoto

Hidenari Tachibe

Takashi Kurosawa

Atsushi Nagaoka

Shingo Kagami

Hidechika Ito

Nurnabila Mohdmakhtar

A three-dimensional shape measuring method includes: a first step to: project first and second projection images on a target object, wherein the first projection images include row-direction stripe patterns different from each other, and the second projection images include column-direction stripe patterns different from each other, and obtain first and second captured images of the target object, wherein the first captured images are captured while the first projection images are projected, and the second captured images are captured while the second projection images are projected; a second step to identify a corresponding projection pixel of the first and second projection images, wherein the corresponding projection pixel corresponds to each of captured pixels of the first and second captured images; and a third step to identify a 3D shape of the target object based on a result of the second step.

Three-dimensional shape measuring method and three-dimensional shape measuring apparatus

An intraoral measurement device includes: a device main body that holds a base end side of a prism by a housing, the housing accommodating an illumination member and an imaging member, a cover member that is attached to the device main body in a state of covering, with a space part interposed in between, a distal end side of the prism arranged to face a measurement target, in which a part arranged to face the measurement target is formed by a light transmission window; and a heat transfer member that extends from the device main body along a non-optical surface of the prism, and transfers heat of the device main body to the light transmission window through abutment of a protruding end provided to protrude from the prism against the light transmission window of the cover member.

Intraoral measurement device

An image forming apparatus includes a photoconductor, a light emitting substrate, and imaging optical systems, wherein an optical axis of the imaging optical systems are parallel, imaging magnifications of the imaging optical systems are substantially equal for the light emitting point groups, the imaging optical systems includes a first lens array, a second lens array, and apertures, central points of the light emitting point group exist in a first plane, central points of the imaging lenses exist in a second plane, central points of the apertures exist in a third plane, central points of the imaging lenses exist in a fourth plane, the first plane forms a non-zero predetermined angle with respect to a plane perpendicular to an optical axis direction, and the angle formed with respect to the plane perpendicular to the optical axis direction is greater in the order of the first, second, third, and the fourth plane.

Image forming apparatus

An image forming apparatus includes: a light-emitting element that includes light-emitting point groups; and an optical system that includes imaging systems focusing light from light-emitting points of the light-emitting point groups, wherein the light-emitting point groups and the imaging systems are combined into sets, the light-receiving surface has a cylindrical shape, each imaging system has a negative imaging magnification, light-emitting point groups are arranged at different positions, the imaging systems adjacent to each other have optical axes non-parallel to each other, each optical axis has an angle being not zero relative to the central normal, and a plane including the optical axis and the central normal is perpendicular to a rotational symmetry axis, and an angle between the optical axis and a line normal to the light-receiving surface is smaller than an angle between the central normal and a line normal to the light-receiving surface.

A video display device includes: a display element displaying images by modulating light from an illumination optical system; and an eyepiece optical system guiding image light from the display element into an optical pupil. The illumination optical system includes: a light source including light emission points arranged substantially linearly; a diffuser plate diffusing illumination light from the light source in a first direction, in which the light emission points are arranged, but not in a second direction perpendicular to the first direction; and an optical element bending the illumination light such that the optical pupil and the light source are substantially conjugate. The optical element includes an illumination mirror, a reflection surface thereof having a non-zero curvature in all sections including a normal line at the optical-axis intersection. Here, the section perpendicular to the first direction has a different curvature from the section perpendicular to the second direction.

Video display device and head-mounted display

An image forming apparatus having: a light source that emits a beam; a photoreceptor that is scanned with the beam to obtain an electrostatic latent image thereon; and a control unit that determines a light intensity of the beam to be emitted for formation of a pixel, based on a data value for the pixel in image data and data values for its surrounding pixels.

Image forming apparatus with a control unit for controlling light intensity of a beam used to scan a photoreceptor

An image forming apparatus wherein a photosensitive drum is located such that its circumferential surface is exposed to light at a position between an image surface of light that is emitted from an LED at a distance of a half of a pitch of a plurality of rod lenses from a first rod lens of the plurality of rod lenses and that passes through the first rod lens and an image surface of light that is emitted from an LED at a distance of the pitch of the plurality of rod lenses from a second rod lens of the plurality of rod lenses and that passes through the second rod lens.

An optical scanning device has a light source comprising a plurality of light emitting points arranged on a plane two-dimensionally; a deflector for deflecting beams emitted from the light emitting points in a main-scanning direction; a first optical system for directing the beams emitted from the light emitting points to the deflector; and a second optical system for directing the beams deflected by the deflector to a photosensitive member and for imaging the beams on a surface of the photosensitive member. The plurality of light emitting points are arranged in a parallelogram lattice composed of M by N lattice points, wherein M and N are integers equal to or greater than six, with none of the light emitting points allocated on central (M&#x2212;4) by (N&#x2212;4) lattice points.

Optical scanning device

An optical scanning device for scanning a photoreceptor surface with a beam, said optical scanning device having: a light source for emitting the beam; an optical system for causing the beam emitted from the light source to converge; and a deflector that includes a polygon mirror with a plurality of reflecting surfaces and that deflects the beam that has passed through the optical system by rotations of the polygon mirror. Between the deflector and the photoreceptor surface, no optical system for causing the beam to converge or diverge is disposed. The optical system for causing the beam emitted from the light source to converge generates spherical aberration depending on which part of the optical system in a main-scanning direction the beam passes through. The beam enters into three or more adjacent reflecting surfaces of the polygon mirror at a time.

An optical scanning device to be employed in an image forming apparatus having a photosensitive member that is scanned with a plurality of beams, and the optical scanning device has a plurality of light emitting elements that are arranged in an area of a parallelogram, in a matrix of M rows and N columns, all the light emitting elements emitting beams, and a deflector for deflecting the beams emitted from the light emitting elements. The light emitting elements are arranged such that the beam emitted from the light emitting element located in the mth row and the nth column and the beam emitted from the light emitting element located in the (m&#x2212;1)th row and the (n+1)th column are scanned on adjacent scanning lines on the photosensitive member, and a scanning line on which the beam emitted from the light emitting element in the first row and the first column is scanned at a time of the (L+1)th scanning motion of the light emitting elements is located in an area from a scanning line on which the beam emitted from the light emitting element in the first row and the first column is scanned at a time of the Lth scanning motion of the light emitting elements to a scanning line on which the beam emitted from the light emitting element in the Mth row and the Nth column is scanned at a time of the Lth scanning motion of the light emitting elements.

An optical scanning device having: a light source for emitting a light beam; a deflector having a plurality of flat reflecting surfaces; a first optical system disposed between the light source and the deflector; and a second optical system disposed between the deflector and a photoreceptor surface, and configured such that the reflecting surfaces of the deflector and the photoreceptor surface are conjugated in a sub-scanning direction at every deflection angle in a main-scanning range. In the optical scanning device, the light beam traveling from the first optical system to the deflector has a width greater than a dimension in a main-scanning direction of each reflecting surface of the deflector, and the light beam passes through different portions of the first optical system depending on whether the light beam is to be deflected by the deflector to be directed to an edge portion of the main-scanning range or to be directed to a center portion of the main-scanning range such that the light beam traveling to the deflector has a smaller average wavefront curvature in a sub-scanning direction when the light beam is to be deflected by the deflector to be directed to an edge portion of the main-scanning range than when the light beam is to be deflected by the deflector to be directed to the center portion of the main-scanning range.

An electrophotographic image forming apparatus having an LED array with a plurality of light emitting elements aligned in a main-scanning direction and a convergent lens array for imaging light emitted from the light emitting elements on a photosensitive member. In order to correct density unevenness caused by positioning errors of the lens array, the light quantity emitted from each of the light emitting elements is adjusted such that the total difference from a target value will be closer to zero.

In a main-scanning direction, light incident on a resonance mirror is convergent light and a first lens of a second optical system has a negative refractive power. Consequently, even with a small angle of deflection, the distance from the resonance mirror to a photoconductor required for obtaining a desired scanning width in the main-scanning direction can be reduced. Moreover, in a sub-scanning direction, light incident on the resonance mirror is parallel light, and the first lens of the second optical system has a negative refractive power and a second lens thereof has a positive refractive power. In addition, the first lens has both surfaces formed with a free curved surface and the second lens thereof also has a free curved surface. This permits keeping the sub-scanning magnification uniform, thus avoiding, even in high-speed drawing with a plurality of beams, image quality deterioration due a change in an interval in the sub-scanning direction between the plurality of beams.

Laser scanner

Laser light, emitted from a laser light source, is formed into a converged light ray by a condensing lens, and deflected by a resonance mirror. The laser light is converged on a photosensitive member through a scanning lens including one negative lens, and has at least one nonaxisymmetric face that provides the same power in the vicinity of the light axis in both of a main scanning direction and a sub-scanning direction. Even when a deflection angle in the resonance mirror is small, it is possible to shorten a distance from the resonance mirror to the photosensitive member, which is required for providing a desired scanning width and to effectively carry out image-face curvature correction and groove-shaped aberration correction within a sub-scanning cross section and to reduce the size of a unit including the resonance mirror and the scanning lens.

Laser scanning device

A plane mirror is disposed in an optical path after a polygon mirror which deflects laser light. Incident light to and reflected light on the polygon mirror has no angle in an auxiliary scanning direction and the polarization direction of laser light is inclined relative to a plane (deflection plane) including the incident light to and the reflected light on the polygon mirror. An inclination angle and inclination direction of the light deflection direction of the laser light, an inclination angle of the plane mirror are configured so as to satisfy predetermined conditions. With such a configuration, a change in reflectance on the polygon mirror accompanying a change in deflection angle can be cancelled or alleviated by a change in reflectance on the plane mirror accompanying the change in deflection angle, and a difference in light quantity distribution on a photosensitive member on the left and right sides thereof is alleviated in comparison with a difference in reflectance to be caused by the polygon mirror.

Growing community of inventors

Toyokawa, Japan

Yoshihiro Inagaki