Canon Kabushiki Kaisha

Kazumi Kimura

Masaki Sato

Hiroshi Sato

Hideaki Mitsutake

Shigeru Kawasaki

Tokuji Takizawa

Nobuyuki Tochigi

Masayasu Teramura

Takashi Suzuki

Takeshi Yamawaki

Junko Shingaki

Hiroki Yoshida

Genichiro Kudo

Hiroto Kano

Noritaka Mochizuki

Nobuo Minoura

Kohtaro Yano

Katsumi Kurematsu

Junko Kuramochi

Hidetoshi Suzuki

Sadahiko Tsuji

Hiroyuki Suzuki

Hidekazu Shimomura

Yoshihiro Ishibe

Kazuyuki Kondo

Yasuhiro Matsuo

Haruo Tomono

Mitsuo Nimura

Yuji Matsuo

Akihiro Fukutomi

Yukio Takemura

Ken-ichi Tomita

Noboru Mizunuma

Kentarou Nomura

An apparatus includes a deflecting unit deflecting a light flux from a light source to scan a scanned surface in a main scanning direction, and an imaging optical system guiding the deflected light flux the scanned surface. A width of the light flux is larger than that of a deflecting surface of the deflecting unit in a main scanning cross section when it is incident on deflecting surface. A refractive power in main scanning cross section of the imaging optical system is different between a first position through which an on-axis light flux passes and a second position through which an outermost off-axis light flux passes. A first region at one side is longer than a second region at the other side with respect to an optical axis of the imaging optical system on the scanned surface.

Light scanning apparatus and image forming apparatus including the same

Optical system includes front group, light-shielding member, and rear group that are arranged in this order in direction from object side toward image side. The light-shielding member is provided with opening elongated in first direction. The front group has aspherical surfaces, does not image the object at the opening in first section parallel to the first direction, and forms intermediate image of the object at the opening in second section perpendicular to the first direction. The rear group has diffractive surface that splits light beam that passes through the opening into light beams at different wavelengths in the second section and focuses the light beams on different locations in the second section. Tilt angles of the aspherical surfaces in the second section change in the first direction.

Optical system, and imaging apparatus and imaging system including the same

An optical systemincludes a front group, a light shielding member, and a rear groupdisposed in order from a side of an object to a side of an image. The light shielding memberhas an opening. The rear grouphas a diffraction surfaceand an aspherical surface. The aspherical surfacein a first section has a non-circular-arc shape. The grating spacing of the diffraction surfacein the first section changes from a center portion toward a peripheral portion to include an extremum value at the center portion. In the first section, the shape of at least one of a base surface of the diffraction surfaceand an optical surface disposed closer than the diffraction surfaceto the side of the object is asymmetric with respect to a normal line at a vertex thereof.

Optical system, imaging apparatus including optical system, and imaging system

Optical system includes a front group, light-shielding member, and rear group that are arranged in this order in direction from object side toward image side. The light-shielding member is provided with opening elongated in first direction. The front group does not image the object at the opening in first section parallel to the first direction and forms intermediate image of the object at the opening in second section perpendicular to the first direction. The rear group has diffractive surface that splits light beam that passes through the opening into light beams at different wavelengths in the second section and focuses the light beams on different locations in the second section. Light beam that is emitted from the front groupand that enters the opening is non-parallel light in the first section.

Optical system includes front group, light-shielding member, and rear group that are arranged from object side toward image side. The light-shielding member is provided with opening elongated in first direction. The front group has aspherical surface, does not image the object at the opening in first section parallel to the first direction, and forms intermediate image of the object at the opening in second section perpendicular to the first direction. The rear group has diffractive surface that splits light beam that passes through the opening into light beams at different wavelengths in the second section and focuses the light beams on different locations in the second section. The curvature radius of the aspherical surface in the second section at on-axis position in the first direction differs from that at outermost off-axis position in the first direction.

The spectral information acquisition system includes an illumination optical system configured to illuminate an object being moved and a spectral optical system configured to disperse light from the object illuminated by the illumination optical system. The illumination optical system includes a separation element configured to separate a light flux emitted from a light source into a first polarized light flux having a first polarization state and a second polarized light flux having a second polarization state, and a phase plate configured to change the polarization state of at least one of the first polarized light flux and the second polarized light flux. The first polarized light flux illuminates the object from a first direction, and the second polarized light flux illuminates the object from a second direction that is different from the first direction.

Spectral information acquisition system, inspection method, and manufacturing method

An optical scanning device includes a deflector configured to deflect first and second beams to scan an effective area of a first scanned surface in a main scanning direction, and first and second imaging optical systems configured to guide the first and second beams deflected by the deflector to first and second areas, respectively, which are included in the effective area and different from each other in the main scanning direction. In the main scanning direction, the first area and the second area are asymmetric in width with respect to an optical axis.

Optical scanning device and image forming apparatus including the same

A scanning optical apparatus includes: a deflection unit configured to deflect a light flux from a light source in a main scanning direction; an incident optical system configured to introduce the light flux from the light source to the deflection unit; a condensing optical system configured to condense the light flux from the deflection unit onto a scanned surface; and a reflection member arranged in a light path of the light flux deflected in the main scanning direction by the deflection unit and configured to reflect a part of the deflected light flux. The reflection member has a reflection surface configured to reflect the deflected light flux, a first end surface formed in the main scanning direction, and a second end surface formed in a sub-scanning direction perpendicular to the main scanning direction, and the second end surface has a higher degree of corrosion resistance than the first end surface.

Scanning optical apparatus and method for manufacturing reflection member

An optical scanning apparatus of the present invention includes: a splitting element which splits a light flux emitted from a light source into first and second light fluxes; a deflecting unit which deflects the first and second light fluxes to scan first and second scanned surfaces in a main scanning direction; and an imaging optical system which includes a first imaging lens on which both the first and second light fluxes deflected by the deflecting unit are incident and guides the first and second light fluxes to the first and second scanned surfaces. The condition expressed by &#x2212;1.1&#x2264;&#x3b1;1/&#x3b1;2&#x2264;&#x2212;0.9 is satisfied where &#x3b1;1 and &#x3b1;2 are angles within a main scanning cross section between a first axis parallel to the main scanning cross section and directions of incidence of the first and second light fluxes on the deflecting unit, respectively.

Optical scanning apparatus

There is provided is a spectrometer having a concave reflection type diffraction element, wherein, among surfaces other than a diffraction surface of the diffraction element, non-diffraction surfaces which are located outside the diffraction surface at the same side as the diffraction surface are a glossy surface, the spectrometer includes a light detection unit which is located at an imaging position of a first-order diffracted light diffracted by the diffraction element to receive the first-order diffracted light, and the light detection unit is disposed inside optical paths of light beams regularly reflected on the non-diffraction surfaces outside the diffraction surface. Accordingly, it is possible to effectively suppress a stray light reflected on the surfaces other the diffraction surface from being incident into the light detection unit and to detect the light spectrally diffracted by the diffraction surface at high accuracy.

Spectrometer and image forming apparatus having the same

A spectral colorimetric apparatus for detecting a color of an image of a subject, including: an illumination optical system illuminating the subject on a detection surface; a spectral optical system including a spectral element spectrally separating the beam diffused by the subject and a light receiving element array detecting a spectral intensity distribution; and a guiding optical system for guiding a beam diffused by the subject, wherein: the detection surface is parallel to a spectral plane including a principal ray of a beam entering the spectral optical system and a principal ray of a beam spectrally separated; the principal ray of the beam enters the spectral optical system within the spectral plane obliquely to a line joining a center of the light receiving element array with a surface vertex of the spectral element; and a light receiving surface of the light receiving element array is orthogonal to the spectral plane.

Spectral colorimetric apparatus and image forming apparatus using the same

An adjustment apparatus for a light source unit installed on an optical scanning apparatus including a deflector, the light source unit including a laser light source and a condensing optical element, and leading the condensed light beam to the deflector, the adjustment apparatus including: a dividing element for dividing the light beam into a plurality of light beams in at least one of a main scanning direction and a sub-scanning direction; an imaging optical element for imaging the plurality of light beams on a light receiving element; and an adjustment mechanism for adjusting a relative position &#x394;X between the condensing optical element and the laser light source in a direction of an optical axis of the condensing optical element, and relative positions &#x394;Y and &#x394;Z between the condensing optical element and the laser light source in directions orthogonal to the optical axis of the condensing optical element.

Adjustment apparatus for light source unit and adjustment method therefor

A concave reflection type diffraction optical element used for a Rowland type spectrometer, in which: the Rowland type spectrometer detects wavelengths in a range including a wavelength &#x3bb;or more and a wavelength &#x3bb;or less (&#x3bb;&#x3c;&#x3bb;); the concave reflection type diffraction optical element has a diffractive efficiency D(&#x3bb;) at a wavelength &#x3bb; which shows local maximum and maximum value at a wavelength &#x3bb;satisfying, the concave reflection type diffraction optical element includes a reference surface having an anamorphic shape; and the following condition is satisfied: R&#x3e;r, where R indicates a meridional line curvature radius of the reference surface and r indicates a sagittal line curvature radius thereof.

Diffraction optical element, spectral colorimetric apparatus, and image forming apparatus

Provided is an illuminator including a light source unit having a light emitting surface, and a light guiding member guiding a light beam to an original disposed on an original plate. An intersection of a center axis of a light emitting surface and the original plate is separated from a reading position of the original in a sub scanning direction, the light guiding member includes an incident surface to which the light beam emitted from the light source unit is incident, a reflection surface that reflects the incident light beam, and an exiting surface exiting the incident light beam and the reflected light beam, and in the sub scanning section, the light beam having the highest light intensity in the light beams from the light source unit is deflected at the incident surface toward the reading position of the original with respect to the center axis.

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Toda, Japan

Kazumi Kimura