Canon Kabushiki Kaisha

Hiroto Kano

Kazumi Kimura

Hiroki Yoshida

Genichiro Kudo

Yu Miyajima

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.

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

An image forming optical system includes a first image forming unit configured to form an image of a first surface onto a second surface, a second image forming unit including at least a portion of the first image forming unit and configured to form an image of the second surface onto a third surface, and a deflection unit configured to deflect light from the second surface toward the third surface. The numerical aperture of the first image forming unit on the side toward the second surface is larger than the numerical aperture of the second image forming unit on the side toward the second surface.

Image forming optical system and image reading apparatus including the same

Provided is a reading apparatus of the present invention, including: an image pickup element configured to pick up an image of an object; a first optical system including at least one reflection surface configured to reflect a light flux from the object, the first optical system being configured to form an intermediate image of the object; and a second optical system configured to image the intermediate image onto a light-receiving surface of the image pickup element, in which: the at least one reflection surface includes a first reflection surface which is closest to the light-receiving surface on an optical path, and which has a positive power; and the following condition is satisfied:&#x2264;TD/IML&#x2264;20where TD represents a maximum distance from the first reflection surface to the light-receiving surface on the optical path, and IML represents a maximum image height of the second optical system.

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Utsunomiya, Japan

Hiroto Kano