Canon Kabushiki Kaisha

Yu Miyajima

Takeyoshi Saiga

Masayasu Teramura

Masafumi Monde

Norio Matsui

Shimpei Matsuo

Tomoyuki Saiki

Seiji Mishima

Mizuki Ishimoto

Tomokazu Morita

Yuichi Tomioka

Noa Sumida

Hiroto Kano

Osamu Morisaki

A first light guide guides first light in a first light guiding path. The first light is of light irradiated from the light source to a sheet. A first detection unit receives reflected light from the sheet and outputs an image signal indicating an image of a surface of the sheet. A second light guide guides second light in a second light guiding path different from the first light guiding path. The second light is of the light irradiated from the light source and is different from the first light. A second detection unit receives the second light and output a detection signal corresponding to a light amount of the second light. A control unit controls a light emission amount of the light source based on the detection signal.

Method for determining type of sheet by imaging sheet

Provided is a light scanning apparatus including a deflector deflecting a light flux to scan a scanned surface, and an imaging optical element including an optical surface and guiding light flux from deflector to scanned surface. The light scanning apparatus causes a first marginal ray on a side closer to a first deflection point on deflector in a first cross section including first deflection point and being perpendicular to a main scanning section and a sub-scanning section, the first marginal ray being included in an on-axis light flux reflected by the optical surface after being deflected at first deflection point, to travel toward a position spaced apart from first deflection point in a sub-scanning direction by 4 mm or more in first cross section. A sub-scanning width of on-axis light flux on first cross section is smaller than a sub-scanning width of on-axis light flux on optical surface.

Light scanning apparatus and image forming apparatus

An image forming optical systemincludes, in order from an enlargement side, a first optical systemhaving a reflecting surface, and a second optical systemhaving a refracting surface. The image forming optical systemis configured to form an intermediate imagebetween the first optical systemand the second optical system. The first optical systemincludes, in order from the enlargement side, a first reflecting grouphaving at least one reflecting surface having negative power, and a second reflecting grouphaving a plurality of reflecting surfacesandhaving positive power. The at least one reflecting surface having negative power includes a reflecting surfaceclosest to the enlargement side in the first reflecting group. An absolute value of power of the reflecting surfaceis smallest in the first optical system

Image forming optical system, and imaging apparatus and projecting apparatus having the same

Provided is a discriminating device including a light-receiving unit receiving light beam from a detected surface (DS) and an optical unit (OU) guiding light beam from DS to light-receiving unit, and satisfying following conditional expressions:0.01&#x2264;|&#x3b2;1/&#x3b2;0&#x2212;1|, and1&#x3c;|&#x3b2;1/&#x3b2;0&#x2212;1|/|&#x3b2;1/&#x3b2;0&#x2212;1|,where &#x3b2;m0 represents a magnification of OU with respect to a first direction in a first cross section parallel to DS when DS is at a first position, &#x3b2;m1 represents a magnification of OU with respect to first direction in first cross section when DS is at a second position shifted from first position by +0.2 mm in a direction perpendicular to DS, &#x3b2;s0 represents a magnification of OU with respect to a second direction perpendicular to first direction in first cross section when DS is at first position, and &#x3b2;s1 represents a magnification of OU with respect to second direction in first cross section when DS is at second position.

Discriminating device and image forming apparatus

The optical scanning apparatus includes a deflecting unit that scans first and second (FaS) scanned surfaces in main scanning direction by deflecting FaS light fluxes incident on a first deflecting surface at different angles with respect to main scanning section in sub-scanning section, and a first optical element including FaS optical portions which guide FaS light fluxes deflected by deflecting unit to FaS scanned surfaces, respectively. An incident surface of first optical element projects most toward deflecting unit at a position of surface vertex on the incident surface in sub-scanning section including the surface vertex. At least one of FaS exit surfaces of FaS optical portions is a sagittal tilt surface. A distance between surface vertices on FaS exit surfaces in sub-scanning section including an incident position of axial ray is larger than the corresponding distance in sub-scanning section including an incident position of outermost off-axis ray.

Optical scanning apparatus and image forming apparatus

An optical scanning apparatus includes first and second deflecting units, and first and second imaging optical systems to guide first and second light fluxes deflected by the first and second deflecting units to first and second scanned surfaces. The first and second imaging optical systems include first and second imaging elements having the largest refractive power in a sub-scanning section. A distance on an optical path between the first deflecting unit and the first imaging element is shorter than that between the second deflecting unit and the second imaging element. The optical scanning apparatus satisfies: where N, d, &#x3d5;, and &#x3d5;are a refractive index, a thickness on an optical axis, a refractive power in a sub-scanning section, and a refractive power in the sub-scanning section of an incident surface, of the first imaging element, and N, d, &#x3d5;, and &#x3d5;are equivalents of the second imaging element.

For the purpose of providing a light guiding member with a simple structure which is capable of suppressing risk that unnecessary light could be mixed in a primary optical path, a light guiding member according to the present invention includes an incident surface, a reflection surface which reflects a light flux from the incident surface, and a side surface disposed at a distance of 1.2 R or more from a center of the reflection surface, where R is a distance from the center to an edge portion of the reflection surface, in a direction perpendicular to a first cross-section including an incident light toward the reflection surface on an optical axis and a reflected light from the reflection surface on the optical axis.

Light guiding member, detector, spectral colorimetric apparatus, and image forming apparatus

In order to provide a discriminating device in which high discrimination accuracy is achieved by appropriately setting parallelism of a plurality of light beams caused to enter a recording material, provided is a discriminating device including: a light guiding member configured to guide a plurality of light beams from a light source to an irradiated surface; an image pickup element configured to receive a light beam from the irradiated surface; and an optical system configured to guide the light beam from the irradiated surface to the image pickup element, wherein the plurality of light beams include a plurality of first light beams which are emitted from the light guiding member and enter a first effective region of the irradiated surface, and wherein the plurality of first light beams form an angle of 7&#xb0; or less with each other within a first cross section parallel to the irradiated surface.

Provided is imaging optical system, including: a first lens array including a plurality of lens rows each having a plurality of lenses arrayed in main array direction, the plurality of lens rows arranged in sub-array direction; and a second lens array including a plurality of lens rows each having a plurality of lenses arrayed in main array direction, the plurality of lens rows being arranged in sub-array direction. The imaging optical system forms an erect image of object in main array cross section, and forms an inverted image of object in sub-array cross section. At least one of first and second lens arrays includes at least one of a scattering and light-shielding portions arranged between adjacent lens rows. D/Rs&#x2264;0.2 is satisfied, where D represents length of at least one of scattering and light-shielding portions in sub-array direction, and Rs represents an effective diameter of imaging optical system in sub-array direction.

Imaging optical system

Provided is an illumination optical system includes: a light source; and a light guiding member configured to guide a light flux emitted from the light source to an illuminated surface, the light guiding member having: an incident surface into which the light flux from the light source enters; an ellipsoidal reflection surface configured to reflect the light flux from the incident surface; and an exit surface from which the light flux reflected by the ellipsoidal reflection surface exits, in which the light source is arranged so as to be separated from a first focal point of the ellipsoidal reflection surface at a position farther from the illuminated surface, in a direction perpendicular to a light emitting surface of the light source.

Illumination optical system, and spectrophotometric apparatus and image forming apparatus including the same

An optical apparatus includes: a light source including multiple light-emitting points arrayed in a first direction; and an imaging optical system including multiple lens optical systems arrayed in the first direction. The imaging optical system forms images of the multiple light-emitting points on a light-receiving surface. In a first cross-section and in a second cross-section, half-value of a maximum value of angle of divergence of an imaging optical flux input to the light-receiving surface, resolution, and a size of each image of the plurality of light-emitting points formed on the light-receiving surface, satisfy predetermined conditions.

Optical apparatus, image forming apparatus, and image reading apparatus

An image forming apparatus includes an exposure unit, including a plurality of light-emitting units that correspond to a respective plurality of pixels and a lens array optical system, for emitting exposure light. A photosensitive member is exposed by the exposure light from the exposure unit. A correcting unit estimates, from image data, an intensity of ghost light at a position of each pixel on the photosensitive member in a case when the photosensitive member is exposed by the exposure unit, using the image data, and corrects the image data based on the estimated intensity of the ghost light.

Image forming and processing apparatus, and method for correcting image data based on an estimated intensity of ghost light

An image forming apparatus includes: a photosensitive member; and an exposure unit. The exposure unit includes a lens array optical system in which a plurality of lenses are disposed along a predetermined direction, and a light-emitting unit having a plurality of light-emitting elements disposed so as to expose, through the lens array optical system, every Lth pixel in L scanning lines of the photosensitive member. An interval of locations, in a main arrangement direction, that correspond to adjacent lenses in the lens array optical system is configured to be an interval based on the value of L.

Image forming apparatus including lens array optical system, image processing apparatus, program product, and storage medium

An imaging optical system includes a plurality of lens optical system rows each including a plurality of lens optical systems arranged in a first direction. The plurality of lens optical system rows is arranged in a second direction perpendicular to the first direction and to an optical axis direction. Each of the plurality of lens optical systems in each of the plurality of lens optical system rows is configured to form an erect equal-magnification image in a cross section perpendicular to the second direction and configured to form an inverted image in across section perpendicular to the first direction. Ina cross section perpendicular to the optical axis direction, optical axes of the respective plurality of lens optical systems in adjoining ones of the plurality of lens optical system rows are separate from one another in the first direction and are located on the a line.

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Utsunomiya, Japan

Yu Miyajima