Patents by Inventor Tsunefumi Tanaka
Tsunefumi Tanaka has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8988538Abstract: An image pickup apparatus includes a plurality of imaging optical systems having different focal lengths and each configured to form an optical image of an object, and a plurality of image sensors having image pickup areas each corresponding to one of the plurality of imaging optical systems and each configured to photoelectrically convert the optical image formed by a corresponding one of the imaging optical systems. The image pickup apparatus is configured to simultaneously capture a plurality of images by controlling the plurality of imaging optical systems and the plurality of image sensors. Each imaging optical system includes a focus lens unit configured to move in focusing and a fixed lens unit that is fixed in the focusing. The image pickup apparatus further includes a focus driver configured to move a plurality of focus lens units by equal moving amounts.Type: GrantFiled: June 26, 2013Date of Patent: March 24, 2015Assignee: Canon Kabushiki KaishaInventors: Chiaki Inoue, Tsunefumi Tanaka, Takashi Oniki
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Patent number: 8659672Abstract: To provide an image processing apparatus capable of obtaining a good-quality image even if an unexpected aberration occurs and an image pickup apparatus using the same. An image processing apparatus includes a primary restored image generating module configured to generate a primary restored image by performing image restoration processing on an input image having a plurality of color components, a restoration component generating module configured to generate difference information for each of the plurality of color components by calculating a difference between the input image and the primary restored image, and a secondary restored image generating module configured to generate a secondary restored image using the difference information. The secondary restored image generating module combines a color-combination restoration component based on the difference information for the plurality of color components with one color component of the input image.Type: GrantFiled: December 14, 2010Date of Patent: February 25, 2014Assignee: Canon Kabushiki KaishaInventors: Koshi Hatakeyama, Nobuhiko Tamura, Tsunefumi Tanaka
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Publication number: 20140002688Abstract: An image pickup apparatus includes a plurality of imaging optical systems having different focal lengths and each configured to form an optical image of an object, and a plurality of image sensors having image pickup areas each corresponding to one of the plurality of imaging optical systems and each configured to photoelectrically convert the optical image formed by a corresponding one of the imaging optical systems. The image pickup apparatus is configured to simultaneously capture a plurality of images by controlling the plurality of imaging optical systems and the plurality of image sensors. Each imaging optical system includes a focus lens unit configured to move in focusing and a fixed lens unit that is fixed in the focusing. The image pickup apparatus further includes a focus driver configured to move a plurality of focus lens units by equal moving amounts.Type: ApplicationFiled: June 26, 2013Publication date: January 2, 2014Inventors: Chiaki INOUE, Tsunefumi TANAKA, Takashi ONIKI
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Patent number: 8565524Abstract: To provide an image processing apparatus capable of obtaining a high-quality image, an image processing apparatus of the present invention includes an image restoration processing unit configured to perform a restoration process on an input image and generate a restored image, a difference information generating unit configured to calculate difference information between the restored image and the input image, an adjustment coefficient setting unit configured to be capable of setting a plurality of different adjustment coefficients for the input image, a correction difference information generating unit configured to generate correction difference information on the basis of the adjustment coefficients and the difference information, and a combining unit to combine the correction difference information with the input image and generate a restoration adjusted image.Type: GrantFiled: February 10, 2012Date of Patent: October 22, 2013Assignee: Canon Kabushiki KaishaInventors: Koshi Hatakeyama, Nobuhiko Tamura, Tsunefumi Tanaka
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Patent number: 8520313Abstract: A zoom lens includes, a plurality of lens units arranged along an optical axis and configured to move from a wide angle end to a telephoto end during a zooming operation of the zoom lens; a first refractive power variable element whose refractive power is changed in a positive direction by changing shapes of boundary surfaces of different media when zooming from the wide-angle end to the telephoto end; and a second refractive power variable element whose refractive power is changed in a negative direction by changing shapes of boundary surfaces of different media when zooming from the wide-angle end to the telephoto end. When zooming from the wide-angle end to the telephoto end, imaging magnifications of the first refractive power variable element and the second refractive power variable element are increased.Type: GrantFiled: October 14, 2010Date of Patent: August 27, 2013Assignee: Canon Kabushiki KaishaInventors: Ken Wada, Yoshihisa Tashiro, Tsunefumi Tanaka
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Publication number: 20120141027Abstract: To provide an image processing apparatus capable of obtaining a high-quality image. An image processing apparatus of the present invention includes an image restoration processing unit configured to perform a restoration process on an input image and generate a restored image, a difference information generating unit configured to calculate difference information between the restored image and the input image, an adjustment coefficient setting unit configured to be capable of setting a plurality of different adjustment coefficients for the input image, a correction difference information generating unit configured to generate correction difference information on the basis of the adjustment coefficients and the difference information, and a combining unit to combine the correction difference information with the input image and generate a restoration adjusted image.Type: ApplicationFiled: February 10, 2012Publication date: June 7, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Koshi Hatakeyama, Nobuhiko Tamura, Tsunefumi Tanaka
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Publication number: 20110149103Abstract: To provide an image processing apparatus capable of obtaining a good-quality image even if an unexpected aberration occurs and an image pickup apparatus using the same. An image processing apparatus includes a primary restored image generating module configured to generate a primary restored image by performing image restoration processing on an input image having a plurality of color components, a restoration component generating module configured to generate difference information for each of the plurality of color components by calculating a difference between the input image and the primary restored image, and a secondary restored image generating module configured to generate a secondary restored image using the difference information. The secondary restored image generating module combines a color-combination restoration component based on the difference information for the plurality of color components with one color component of the input image.Type: ApplicationFiled: December 14, 2010Publication date: June 23, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Koshi Hatakeyama, Nobuhiko Tamura, Tsunefumi Tanaka
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Patent number: 7961404Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, and a third lens unit of positive refractive power. The zoom lens changes the distances between the lens units during zooming. The following condition is satisfied: 0.3<|f1/fT<0.5 2.3<|f1/fw<3.5, where f1 is a focal length of the first lens unit, fT is a focal length of the zoom lens at a telephoto end, and fw is a focal length of the zoom lens at a wide-angle end.Type: GrantFiled: July 15, 2010Date of Patent: June 14, 2011Assignee: Canon Kabushiki KaishaInventors: Toyokatsu Fujisaki, Tsunefumi Tanaka
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Publication number: 20110090571Abstract: A zoom lens includes, a plurality of lens units arranged along an optical axis and configured to move from a wide angle end to a telephoto end during a zooming operation of the zoom lens; a first refractive power variable element whose refractive power is changed in a positive direction by changing shapes of boundary surfaces of different media when zooming from the wide-angle end to the telephoto end; and a second refractive power variable element whose refractive power is changed in a negative direction by changing shapes of boundary surfaces of different media when zooming from the wide-angle end to the telephoto end. When zooming from the wide-angle end to the telephoto end, imaging magnifications of the first refractive power variable element and the second refractive power variable element are increased.Type: ApplicationFiled: October 14, 2010Publication date: April 21, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Ken Wada, Yoshihisa Tashiro, Tsunefumi Tanaka
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Patent number: 7876507Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, and a third lens unit of positive refractive power. The zoom lens changes the distances between the lens units during zooming. The following condition is satisfied: 0.3<|f1 |/fT<0.5, where f1 is a focal length of the first lens unit, and fT is a focal length of the zoom lens at a telephoto end.Type: GrantFiled: January 4, 2008Date of Patent: January 25, 2011Assignee: Canon Kabushiki KaishaInventors: Toyokatsu Fujisaki, Tsunefumi Tanaka
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Publication number: 20100277812Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, and a third lens unit of positive refractive power. The zoom lens changes the distances between the lens units during zooming. The following condition is satisfied: 0.3<|f1/fT<0.5 2.3<|f1/fw<3.5, where f1 is a focal length of the first lens unit, fT is a focal length of the zoom lens at a telephoto end, and fw is a focal length of the zoom lens at a wide-angle end.Type: ApplicationFiled: July 15, 2010Publication date: November 4, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Toyokatsu Fujisaki, Tsunefumi Tanaka
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Publication number: 20090303611Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, and a third lens unit of positive refractive power. The zoom lens changes the distances between the lens units during zooming. The following condition is satisfied: 0.3<|f1 |/fT<0.5, where f1 is a focal length of the first lens unit, and fT is a focal length of the zoom lens at a telephoto end.Type: ApplicationFiled: January 4, 2008Publication date: December 10, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Toyokatsu Fujisaki, Tsunefumi Tanaka
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Patent number: 7457045Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, and a third lens unit of positive refractive power. The first lens unit moves in a locus convex toward the image side and the second lens unit moves toward the object side during zooming from a wide-angle end to a telephoto end. The object side principal point position of the first lens unit is within the first lens unit. The movement locus of the image side principal point position of the first lens unit during zooming from the wide-angle end to the telephoto end intersects with the movement locus of the object side principal point position of the second lens unit during zooming from the wide-angle end to the telephoto end.Type: GrantFiled: January 4, 2008Date of Patent: November 25, 2008Assignee: Canon Kabushiki KaishaInventors: Toyokatsu Fujisaki, Tsunefumi Tanaka
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Publication number: 20080186588Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, and a third lens unit of positive refractive power. The first lens unit moves in a locus convex toward the image side and the second lens unit moves toward the object side during zooming from a wide-angle end to a telephoto end. The object side principal point position of the first lens unit is within the first lens unit. The movement locus of the image side principal point position of the first lens unit during zooming from the wide-angle end to the telephoto end intersects with the movement locus of the object side principal point position of the second lens unit during zooming from the wide-angle end to the telephoto end.Type: ApplicationFiled: January 4, 2008Publication date: August 7, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Toyokatsu Fujisaki, Tsunefumi Tanaka
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Patent number: 7258452Abstract: There is disclosed a projection optical system which is capable of moving a projected image within a predetermined region (effective projection region). The projection optical system, which projects an image of an object surface in the effective projection region of a predetermined image surface comprises two or more optical systems, among which a first optical system on the object surface side comprises a zoom portion which zooms the projected image. The projection optical system further comprises one or more rotatable members which rotate around the position of an exit pupil of the first optical system or its vicinity. In addition, by rotating the one or more rotatable members, the projected image is moved within the effective projection region.Type: GrantFiled: October 14, 2004Date of Patent: August 21, 2007Assignee: Canon Kabushiki KaishaInventors: Koshi Hatakeyama, Tsunefumi Tanaka
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Publication number: 20050078281Abstract: There is disclosed a projection optical system which is capable of moving a projected image within a predetermined region (effective projection region). The projection optical system, which projects an image of an object surface in the effective projection region of a predetermined image surface comprises two or more optical systems, among which a first optical system on the object surface side comprises a zoom portion which zooms the projected image. The projection optical system further comprises one or more rotatable members which rotate around the position of an exit pupil of the first optical system or its vicinity. In addition, by rotating the one or more rotatable members, the projected image is moved within the effective projection region.Type: ApplicationFiled: October 14, 2004Publication date: April 14, 2005Inventors: Koshi Hatakeyama, Tsunefumi Tanaka
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Patent number: 6842280Abstract: An optical element comprising an object-side imaging element for imaging an object on an intermediate image plane in an optical path before a final image plane and an image-side imaging element for reimaging an object image formed on the intermediate image plane, on the final image plane, wherein at least one of the object-side imaging element and the image-side imaging element comprises an off-axial curved surface, and wherein aberration is generated by both of the object-side imaging element and the image-side imaging element, thereby flattening (disturbance of) a light intensity distribution caused on the final image plane by a noise source at or near the intermediate image plane.Type: GrantFiled: January 26, 2004Date of Patent: January 11, 2005Assignee: Canon Kabushiki KaishaInventors: Keisuke Araki, Tsunefumi Tanaka, Makoto Sekita, Kenichi Kimura, Takeshi Akiyama, Toshihiro Sunaga
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Patent number: 6812447Abstract: In order to detect the amplitude and phase of object light with a high SNR, an image pickup apparatus includes an image pickup unit having semiconductor photodetection elements arrayed two-dimensionally, a light-emitting element unit for emitting reference light having a predetermined frequency difference with respect to the frequency of light incident on the image pickup unit, and a wave synthesizer for synthesizing the incident light with the reference light from the light-emitting element unit and guiding the resultant light to the image pickup unit.Type: GrantFiled: July 30, 2001Date of Patent: November 2, 2004Assignee: Canon Kabushiki KaishaInventors: Hiroaki Hoshi, Tsunefumi Tanaka
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Patent number: 6785060Abstract: A reflecting-type optical system according to the invention includes an optical element composed of a transparent body having an entrance surface, an exit surface and at least three curved reflecting surfaces of internal reflection. A light beam coming from an object and entering at the entrance surface is reflected from at least one of the reflecting surfaces to form a primary image within the optical element and is, then, made to exit from the exit surface through the remaining reflecting surfaces to form an object image on a predetermined plane. In the optical system, 70% or more of the length of a reference axis in the optical element lies in one plane.Type: GrantFiled: January 14, 2002Date of Patent: August 31, 2004Assignee: Canon Kabushiki KaishaInventors: Kenichi Kimura, Tsunefumi Tanaka, Toshiya Kurihashi, Shigeo Ogura, Keisuke Araki, Makoto Sekita, Nobuhiro Takeda, Yoshihiro Uchino, Toshikazu Yanai, Norihiro Nanba, Hiroshi Saruwatari, Takeshi Akiyama
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Publication number: 20040150879Abstract: An optical element comprising an object-side imaging element for imaging an object on an intermediate image plane in an optical path before a final image plane and an image-side imaging element for reimaging an object image formed on the intermediate image plane, on the final image plane, wherein at least one of the object-side imaging element and the image-side imaging element comprises an off-axial curved surface, and wherein aberration is generated by both of the object-side imaging element and the image-side imaging element, thereby flattening (disturbance of) a light intensity distribution caused on the final image plane by a noise source at or near the intermediate image plane.Type: ApplicationFiled: January 26, 2004Publication date: August 5, 2004Applicant: Canon Kabushiki KaishaInventors: Keisuke Araki, Tsunefumi Tanaka, Makoto Sekita, Kenichi Kimura, Takeshi Akiyama, Toshihiro Sunaga