Patents by Inventor Tohru Ishizaka
Tohru Ishizaka 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: 9766429Abstract: An imaging lens for a solid-state image sensor includes five lenses, arranged in order from an object side to an image side, a first lens with positive refractive power having a convex surface on the object side, a second lens with negative refractive power, a third lens with positive or negative refractive power having a meniscus shape with a convex surface on the object side and a concave surface on the image side near an optical axis, a fourth lens as a double-sided aspheric lens, having a concave surface on the image side near the optical axis, and a fifth lens as a double-sided aspheric lens, having a concave surface on the image side near the optical axis; wherein the first to fifth lenses are made of plastic materials.Type: GrantFiled: December 9, 2014Date of Patent: September 19, 2017Assignee: KANTATSU CO., LTD.Inventor: Tohru Ishizaka
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Patent number: 9720211Abstract: A low-cost imaging lens which corrects aberrations properly with a small F-value, ensures high performance with a larger number of constituent lenses and has a more low-profile design than before. The constituent lenses are arranged in the following order from an object side to an image side: a positive (refractive power) first lens having a convex object-side surface near an optical axis; a positive second lens having convex object-side and image-side surfaces near the optical axis; a negative third lens having a concave image-side surface near the optical axis; a fourth lens having at least one aspheric surface; a meniscus fifth lens having a concave object-side surface near the optical axis; a sixth lens as a double-sided aspheric lens; and a negative seventh lens as a double-sided aspheric lens having a concave image-side surface near the optical axis. These constituent lenses are not joined to each other.Type: GrantFiled: February 8, 2016Date of Patent: August 1, 2017Assignee: KANTATSU CO., LTD.Inventor: Tohru Ishizaka
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Publication number: 20160154214Abstract: A low-cost imaging lens which corrects aberrations properly with a small F-value, ensures high performance with a larger number of constituent lenses and has a more low-profile design than before. The constituent lenses are arranged in the following order from an object side to an image side: a positive (refractive power) first lens having a convex object-side surface near an optical axis; a positive second lens having convex object-side and image-side surfaces near the optical axis; a negative third lens having a concave image-side surface near the optical axis; a fourth lens having at least one aspheric surface; a meniscus fifth lens having a concave object-side surface near the optical axis; a sixth lens as a double-sided aspheric lens; and a negative seventh lens as a double-sided aspheric lens having a concave image-side surface near the optical axis. These constituent lenses are not joined to each other.Type: ApplicationFiled: February 8, 2016Publication date: June 2, 2016Applicant: KANTATSU CO., LTD.Inventor: Tohru Ishizaka
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Patent number: 9279963Abstract: A low-cost imaging lens which corrects aberrations properly with a small F-value, ensures high performance with a larger number of constituent lenses and has a more low-profile design than before. The constituent lenses are arranged in the following order from an object side to an image side: a first lens having a convex object-side surface near an optical axis; a second lens having a convex object-side surface near the optical axis; a third lens having at least one aspheric surface; a fourth lens having at least one aspheric surface; a fifth lens as a double-sided aspheric lens; a sixth lens as a double-sided aspheric lens having a concave image-side surface near the optical axis; and a seventh lens as a double-sided aspheric lens having a concave image-side surface near the optical axis. These constituent lenses are not joined to each other.Type: GrantFiled: May 18, 2015Date of Patent: March 8, 2016Assignee: KANTATSU CO., LTD.Inventor: Tohru Ishizaka
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Patent number: 9256055Abstract: A low-cost imaging lens which corrects aberrations properly with a small F-value, ensures high performance with a larger number of constituent lenses and has a more low-profile design than before. The constituent lenses are arranged in the following order from an object side to an image side: a first lens having a convex object-side surface near an optical axis; a positive second lens; a negative third lens having a convex object-side surface near the optical axis; a fourth lens having at least one aspheric surface; a fifth lens as a double-sided aspheric lens; a sixth lens as a double-sided aspheric lens; and a seventh lens as a double-sided aspheric lens having a concave image-side surface near the optical axis. These constituent lenses are not joined to each other.Type: GrantFiled: May 18, 2015Date of Patent: February 9, 2016Assignee: KANTATSU CO., LTD.Inventor: Tohru Ishizaka
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Publication number: 20150247992Abstract: A low-cost imaging lens which corrects aberrations properly with a small F-value, ensures high performance with a larger number of constituent lenses and has a more low-profile design than before. The constituent lenses are arranged in the following order from an object side to an image side: a first lens having a convex object-side surface near an optical axis; a second lens having a convex object-side surface near the optical axis; a third lens having at least one aspheric surface; a fourth lens having at least one aspheric surface; a fifth lens as a double-sided aspheric lens; a sixth lens as a double-sided aspheric lens having a concave image-side surface near the optical axis; and a seventh lens as a double-sided aspheric lens having a concave image-side surface near the optical axis. These constituent lenses are not joined to each other.Type: ApplicationFiled: May 18, 2015Publication date: September 3, 2015Applicant: KANTATSU CO., LTD.Inventor: Tohru Ishizaka
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Publication number: 20150247993Abstract: A low-cost imaging lens which corrects aberrations properly with a small F-value, ensures high performance with a larger number of constituent lenses and has a more low-profile design than before. The constituent lenses are arranged in the following order from an object side to an image side: a first lens having a convex object-side surface near an optical axis; a positive second lens; a negative third lens having a convex object-side surface near the optical axis; a fourth lens having at least one aspheric surface; a fifth lens as a double-sided aspheric lens; a sixth lens as a double-sided aspheric lens; and a seventh lens as a double-sided aspheric lens having a concave image-side surface near the optical axis. These constituent lenses are not joined to each other.Type: ApplicationFiled: May 18, 2015Publication date: September 3, 2015Applicant: KANTATSU CO., LTD.Inventor: Tohru Ishizaka
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Patent number: 9063318Abstract: A low-cost imaging lens which corrects aberrations properly with a small F-value, ensures high performance with a larger number of constituent lenses and has a more low-profile design than before. The constituent lenses are arranged in the following order from an object side to an image side: a positive (refractive power) first lens having a convex object-side surface near an optical axis; a positive second lens having convex object-side and image-side surfaces near the optical axis; a negative third lens having a concave image-side surface near the optical axis; a fourth lens having at least one aspheric surface; a meniscus fifth lens having a concave object-side surface near the optical axis; a sixth lens as a double-sided aspheric lens; and a negative seventh lens as a double-sided aspheric lens having a concave image-side surface near the optical axis. These constituent lenses are not joined to each other.Type: GrantFiled: December 18, 2013Date of Patent: June 23, 2015Assignee: KANTATSU CO., LTD.Inventor: Tohru Ishizaka
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Publication number: 20150092285Abstract: An imaging lens for a solid-state image sensor includes five lenses, arranged in order from an object side to an image side, a first lens with positive refractive power having a convex surface on the object side, a second lens with negative refractive power, a third lens with positive or negative refractive power having a meniscus shape with a convex surface on the object side and a concave surface on the image side near an optical axis, a fourth lens as a double-sided aspheric lens, having a concave surface on the image side near the optical axis, and a fifth lens as a double-sided aspheric lens, having a concave surface on the image side near the optical axis; wherein the first to fifth lenses are made of plastic materials.Type: ApplicationFiled: December 9, 2014Publication date: April 2, 2015Applicant: KANTATSU CO., LTD.Inventor: Tohru Ishizaka
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Patent number: 8934179Abstract: An imaging lens includes five lenses for a solid-state image sensor, arranged in order from the object side to the image side, a first lens with positive refractive power having a convex object side surface, a second lens with negative refractive power having a concave image side surface, a third lens with positive or negative refractive power, a fourth lens with positive refractive power as a double-sided aspheric lens having a concave image side surface near an optical axis, and a fifth lens with negative refractive power as a double-sided aspheric lens having a concave image side surface near the optical axis, wherein the first lens and second lens satisfy conditional expressions below: 45<?1<90??(1) 22<?2<35??(2) 2.0<?1/?2<2.6??(3) where ?1: first lens Abbe number ?2: second lens Abbe number.Type: GrantFiled: March 29, 2013Date of Patent: January 13, 2015Assignee: Kantatsu Co., Ltd.Inventor: Tohru Ishizaka
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Patent number: 8902513Abstract: An image pickup lens includes, an aperture stop, a first meniscus lens having positive refractive power with a convex surface facing the object, a second lens having positive refractive power with a concave surface facing the object, a third lens having negative refractive power with a convex surface facing the object, the both surfaces of the third lens are aspheric and having at least one pole-change point, and following conditional expressions are satisfied: TTL<3.0??(1) 0.80<f1/f<0.93??(2) 0.35<bf/TTL<0.42??(3) 0.70<TTL/(2IH)<0.85??(4) where TTL: a length from the surface closest to the object to an image plane, f: a focal length of an overall optical system, f1: a focal length of the first lens, bf: a length from the image-side surface of the third lens to the image plane, and IH: a maximum image height.Type: GrantFiled: August 7, 2013Date of Patent: December 2, 2014Assignee: Kantatsu Co., Ltd.Inventors: Tohru Ishizaka, Masaya Hashimoto
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Publication number: 20140211324Abstract: A low-cost imaging lens which corrects aberrations properly with a small F-value, ensures high performance with a larger number of constituent lenses and has a more low-profile design than before. The constituent lenses are arranged in the following order from an object side to an image side: a positive (refractive power) first lens having a convex object-side surface near an optical axis; a positive second lens having convex object-side and image-side surfaces near the optical axis; a negative third lens having a concave image-side surface near the optical axis; a fourth lens having at least one aspheric surface; a meniscus fifth lens having a concave object-side surface near the optical axis; a sixth lens as a double-sided aspheric lens; and a negative seventh lens as a double-sided aspheric lens having a concave image-side surface near the optical axis. These constituent lenses are not joined to each other.Type: ApplicationFiled: December 18, 2013Publication date: July 31, 2014Applicant: KANTATSU CO., LTD.Inventor: Tohru Ishizaka
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Publication number: 20140063623Abstract: An image pickup lens includes, an aperture stop, a first meniscus lens having positive refractive power with a convex surface facing the object, a second lens having positive refractive power with a concave surface facing the object, a third lens having negative refractive power with a convex surface facing the object, the both surfaces of the third lens are aspheric and having at least one pole-change point, and following conditional expressions are satisfied: TTL<3.0??(1) 0.80<f1/f<0.93??(2) 0.35<bf/TTL<0.42??(3) 0.70<TTL/(2IH)<0.85??(4) where TTL: a length from the surface closest to the object to an image plane, f: a focal length of an overall optical system, f1: a focal length of the first lens, bf: a length from the image-side surface of the third lens to the image plane, and IH: a maximum image height.Type: ApplicationFiled: August 7, 2013Publication date: March 6, 2014Applicant: KANTATSU CO., LTD.Inventors: Tohru Ishizaka, Masaya Hashimoto
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Publication number: 20130265651Abstract: An imaging lens includes five lenses for a solid-state image sensor, arranged in order from the object side to the image side, a first lens with positive refractive power having a convex object side surface, a second lens with negative refractive power having a concave image side surface, a third lens with positive or negative refractive power, a fourth lens with positive refractive power as a double-sided aspheric lens having a concave image side surface near an optical axis, and a fifth lens with negative refractive power as a double-sided aspheric lens having a concave image side surface near the optical axis, wherein the first lens and second lens satisfy conditional expressions below: 45<?1<90??(1) 22<?2<35??(2) 2.0<?1/?2<2.6??(3) where ?1: first lens Abbe number ?2: second lens Abbe number.Type: ApplicationFiled: March 29, 2013Publication date: October 10, 2013Applicant: KANTATSU CO., LTD.Inventor: Tohru Ishizaka