Patents by Inventor Katsuhisa Tsutsumi
Katsuhisa Tsutsumi 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: 9494770Abstract: An imaging lens consists of a front group and a rear group. The front group is composed of a lens having a negative meniscus shape with a convex surface on the object side, a negative lens, a negative lens, and a positive lens in order from the object side. The rear group is composed of a positive lens, a negative lens, a positive lens, and a positive lens in order from the object side. The imaging lens satisfies given conditional expressions.Type: GrantFiled: February 20, 2015Date of Patent: November 15, 2016Assignee: FUJIFILM CorporationInventors: Ping Sun, Katsuhisa Tsutsumi, Michio Cho
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Patent number: 9477068Abstract: An imaging lens provided with a negative first lens group and a positive second lens group disposed in order from the object side. The first lens group is composed of a first group first lens which is a biconcave negative single lens, and the second lens group is composed of a positive second group first lens, an aperture stop, a positive second group second lens, and a negative second group third lens disposed in order from the object side. The second group second lens and second group third lens are cemented to form a cemented lens. The imaging lens is configured to satisfy conditional expressions (2): 0<fg2/f<1.3, (2b?): 0.5<fg2/f<1.25, and (6): 31<?d2 <70 at the same time, where fg2 is combined focal length of the second lens group, f is focal length of the entire lens system, and ?d2 is Abbe number of the second group first lens.Type: GrantFiled: January 9, 2014Date of Patent: October 25, 2016Assignee: FUJIFILM CorporationInventors: Katsuhisa Tsutsumi, Yoshiaki Ishii
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Patent number: 9389398Abstract: An imaging lens substantially consists of a negative first lens group and a positive second lens group in this order from the object side. The first lens group substantially consists of only a first lens, which is one biconcave lens. The second lens group substantially consists of, in the following order from the object side: a cemented lens, which is formed by bonding a positive lens and a negative lens, in this order from the object side, and which has a positive refractive power as a whole; an aperture stop; a positive lens; and a negative lens. The imaging lens is configured to satisfy the conditional expressions (1a): 0<f23/f<2.5 and (2a): 0<f45/f<6 at the same time.Type: GrantFiled: February 3, 2014Date of Patent: July 12, 2016Assignee: FUJIFILM CorporationInventors: Katsuhisa Tsutsumi, Yoshiaki Ishii
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Patent number: 9335523Abstract: An imaging lens provided with a negative first lens group and a positive second lens group arranged in order from the object side. The first lens group is composed of a first group first lens which is a negative single lens, and the second lens group is composed of a positive second group first lens, a positive second group second lens, and a negative second group third lens arranged in order from the object side. The second group first lens is a biconvex lens, the second group second lens is a biconvex lens, the second group third lens is a meniscus lens, an aperture stop is disposed between the second group first and second lenses, and the second group second and third lenses form a cemented lens. The imaging lens satisfies conditional expressions (1): ?0.89?f1/f<0 and (4): 0.3<dt1/f<0.8.Type: GrantFiled: January 8, 2014Date of Patent: May 10, 2016Assignee: FUJIFILM CorporationInventors: Katsuhisa Tsutsumi, Yoshiaki Ishii
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Patent number: 9239448Abstract: An imaging lens substantially consists of a negative first lens group and a positive second lens group in this order from the object side. The first lens group substantially consists of only a first lens, which is one biconcave lens. The second lens group substantially consists of, in the following order from the object side: a cemented lens, which is formed by bonding a second lens, i.e., a biconvex lens, and a third lens, i.e., a negative meniscus lens, in this order from the object side, and which has a positive refractive power as a whole; an aperture stop; and a cemented lens that is formed by bonding a fourth lens, i.e., a biconvex lens and a fifth lens, i.e., a negative meniscus lens in this order from the object side and that has a positive refractive power as a whole.Type: GrantFiled: February 3, 2014Date of Patent: January 19, 2016Assignee: FUJIFILM CorporationInventors: Katsuhisa Tsutsumi, Yoshiaki Ishii
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Patent number: 9176306Abstract: An imaging lens provided with a negative first lens group and a positive second lens group arranged in order from the object side. The first lens group is composed of a first group first lens which is a biconcave negative single lens, and the second lens group is composed of a positive second group first lens, an aperture stop, a positive second group second lens, and a negative second group third lens arranged in order from the object side, in which the second group second lens and the second group third lens are cemented together to form a cemented lens. When f1 and f2 are taken as the focal lengths of the first group first lens and the second group first lens respectively, the imaging lens satisfies a conditional expression (4a?): 0.62<|f1/f2|<0.82.Type: GrantFiled: January 9, 2014Date of Patent: November 3, 2015Assignee: FUJIFILM COPORATIONInventors: Katsuhisa Tsutsumi, Yoshiaki Ishii
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Publication number: 20150168693Abstract: An imaging lens consists of a front group and a rear group. The front group is composed of a lens having a negative meniscus shape with a convex surface on the object side, a negative lens, a negative lens, and a positive lens in order from the object side. The rear group is composed of a positive lens, a negative lens, a positive lens, and a positive lens in order from the object side. The imaging lens satisfies given conditional expressions.Type: ApplicationFiled: February 20, 2015Publication date: June 18, 2015Inventors: PING SUN, KATSUHISA TSUTSUMI, MICHIO CHO
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Patent number: 9036279Abstract: An imaging lens provided with a negative first lens group and a positive second lens group disposed in order from the object side. The first lens group is composed of a first group first lens which is a negative biconcave single lens, and the second lens group is composed of a positive second group first lens, an aperture stop, a positive second group second lens, and a negative second group third lens disposed in order from the object side. The second group second lens and second group third lens are cemented together to form a cemented lens. The imaging lens is configured to satisfy a conditional expression (3) 0.9<dt3/f<1.3, and further configured to satisfy conditional expression (1) 31<?d2<55 or (1?): 35<?d2 and a conditional expression (2): ?10<?d1??d2<25.Type: GrantFiled: January 13, 2014Date of Patent: May 19, 2015Assignee: FUJIFILM CORPORATIONInventors: Katsuhisa Tsutsumi, Yoshiaki Ishii
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Publication number: 20140362455Abstract: The imaging lens substantially consists of a front group having positive refractive power, an aperture stop, a rear group having positive refractive power in this order from the object side. The front group substantially consists of a lens having a negative meniscus shape with a convex surface toward the object side, a negative lens, and a positive lens in this order from the object side. The rear group substantially consists of a positive lens, a negative lens, a positive lens, and a positive lens in this order from the object side. In the case that the Abbe numbers with respect to the d-line of the first lens and the second lens from the object side in the front group are respectively ?1 and ?2, conditional expressions (1) and (2) below are satisfied: 10.0<?2??1??(1) 40<?2??(2).Type: ApplicationFiled: August 22, 2014Publication date: December 11, 2014Inventors: Ping SUN, Katsuhisa TSUTSUMI, Kazunori ONO, Michio CHO
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Publication number: 20140146404Abstract: An imaging lens substantially consists of a negative first lens group and a positive second lens group in this order from the object side. The first lens group substantially consists of only a first lens, which is one biconcave lens. The second lens group substantially consists of, in the following order from the object side: a cemented lens, which is formed by bonding a second lens, i.e., a biconvex lens, and a third lens, i.e., a negative meniscus lens, in this order from the object side, and which has a positive refractive power as a whole; an aperture stop; and a cemented lens that is formed by bonding a fourth lens, i.e., a biconvex lens and a fifth lens, i.e., a negative meniscus lens in this order from the object side and that has a positive refractive power as a whole.Type: ApplicationFiled: February 3, 2014Publication date: May 29, 2014Applicant: FUJIFILM CorporationInventors: Katsuhisa TSUTSUMI, Yoshiaki ISHII
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Publication number: 20140146405Abstract: An imaging lens substantially consists of a negative first lens group and a positive second lens group in this order from the object side. The first lens group substantially consists of only a first lens, which is one biconcave lens. The second lens group substantially consists of, in the following order from the object side: a cemented lens, which is formed by bonding a positive lens and a negative lens, in this order from the object side, and which has a positive refractive power as a whole; an aperture stop; a positive lens; and a negative lens. The imaging lens is configured to satisfy the conditional expressions (1a): 0<f23/f<2.5 and (2a): 0<f45/f<6 at the same time.Type: ApplicationFiled: February 3, 2014Publication date: May 29, 2014Applicant: FUJIFILM CorporationInventors: Katsuhisa TSUTSUMI, Yoshiaki ISHII
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Publication number: 20140146403Abstract: An imaging lens substantially consists of a negative first lens group and a positive second lens group in this order from the object side. The first lens group substantially consists of merely a first lens, which is one negative lens. The second lens group substantially consists of, in the following order from the object side: a cemented lens, which is formed by bonding a positive lens, and a negative lens, in this order from the object side, and which has a positive refractive power as a whole; an aperture stop; a positive lens; and a negative lens. The imaging lens is configured to satisfy the conditional expression (1a): ?2.3<f1/fg2<?0.45, where f1 represents the focal length of the first lens, and fg2 represents the focal length of the second lens group.Type: ApplicationFiled: January 31, 2014Publication date: May 29, 2014Applicant: FUJIFILM CORPORATIONInventors: Katsuhisa TSUTSUMI, Yoshiaki ISHII
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Publication number: 20140126071Abstract: An imaging lens provided with a negative first lens group and a positive second lens group arranged in order from the object side. The first lens group is composed of a first group first lens which is a biconcave negative single lens, and the second lens group is composed of a positive second group first lens, an aperture stop, a positive second group second lens, and a negative second group third lens arranged in order from the object side, in which the second group second lens and the second group third lens are cemented together to form a cemented lens. When f1 and f2 are taken as the focal lengths of the first group first lens and the second group first lens respectively, the imaging lens satisfies a conditional expression (4a?): 0.62<|f1/f2|<0.82.Type: ApplicationFiled: January 9, 2014Publication date: May 8, 2014Applicant: FUJIFILM CorporationInventors: Katsuhisa TSUTSUMI, Yoshiaki ISHII
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Publication number: 20140126068Abstract: An imaging lens provided with a negative first lens group and a positive second lens group arranged in order from the object side. The first lens group is composed of a first group first lens which is a negative single lens, and the second lens group is composed of a positive second group first lens, a positive second group second lens, and a negative second group third lens arranged in order from the object side. The second group first lens is a biconvex lens, the second group second lens is a biconvex lens, the second group third lens is a meniscus lens, an aperture stop is disposed between the second group first and second lenses, and the second group second and third lenses form a cemented lens. The imaging lens satisfies conditional expressions (1): ?0.89?f1/f<0 and (4): 0.3<dt1/f<0.8.Type: ApplicationFiled: January 8, 2014Publication date: May 8, 2014Applicant: FUJIFILM CORPORATIONInventors: Katsuhisa TSUTSUMI, Yoshiaki ISHII
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Publication number: 20140126069Abstract: An imaging lens provided with a negative lens group and a positive second lens group disposed in order from the object side. The first lens group is composed of a first group first lens which is a negative single lens, and the second lens group is composed of a positive second group first lens, a positive second group second lens, and a negative second group third lens disposed in order from the object side in which an aperture stop is disposed in the second lens group or the first group first lens has a biconcave shape and an aperture stop is disposed between the second group first lens and the second group second lens.Type: ApplicationFiled: January 9, 2014Publication date: May 8, 2014Applicant: FUJIFILM CorporationInventors: Katsuhisa TSUTSUMI, Yoshiaki ISHII
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Publication number: 20140126074Abstract: An imaging lens provided with a negative first lens group and a positive second lens group disposed in order from the object side. The first lens group is composed of a first group first lens which is a negative biconcave single lens, and the second lens group is composed of a positive second group first lens, an aperture stop, a positive second group second lens, and a negative second group third lens disposed in order from the object side. The second group second lens and second group third lens are cemented together to form a cemented lens. The imaging lens is configured to satisfy a conditional expression (3) 0.9<dt3/f<1.3, and further configured to satisfy conditional expression (1) 31<?d2<55 or (1?): 35<?d2 and a conditional expression (2): ?10<?d1??d2<25.Type: ApplicationFiled: January 13, 2014Publication date: May 8, 2014Applicant: FUJIFILM CorporationInventors: Katsuhisa TSUTSUMI, Yoshiaki ISHII
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Publication number: 20140118853Abstract: An imaging lens provided with a negative first lens group and a positive second lens group disposed in order from the object side. The first lens group is composed of a first group first lens which is a biconcave negative single lens, and the second lens group is composed of a positive second group first lens, an aperture stop, a positive second group second lens, and a negative second group third lens disposed in order from the object side. The second group second lens and second group third lens are cemented to form a cemented lens. The imaging lens is configured to satisfy conditional expressions (2): 0<fg2/f<1.3, (2b?): 0.5<fg2/f<1.25, and (6): 31<?d2<70 at the same time, where fg2 is combined focal length of the second lens group, f is focal length of the entire lens system, and ?d2 is Abbe number of the second group first lens.Type: ApplicationFiled: January 9, 2014Publication date: May 1, 2014Applicant: FUJIFILM CorporationInventors: Katsuhisa TSUTSUMI, Yoshiaki ISHII
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Patent number: 8213096Abstract: An imaging lens includes a first group having a positive or negative refractive power, a second group having a positive refractive power, a third group having a positive or negative refractive power, which are sequentially arranged from the object side of the imaging lens. The first group includes an aperture stop, and the second group includes a positive lens, and a cemented lens of a positive lens and a negative lens. The third group is composed of a cemented lens of a positive lens and a negative lens, and the following formula (1) is satisfied: 0.5?f2/f?1.2??(1), where f: focal length of the entire system of the imaging lens, and f2: focal length of the second group.Type: GrantFiled: December 10, 2010Date of Patent: July 3, 2012Assignee: Fujifilm CorporationInventor: Katsuhisa Tsutsumi
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Publication number: 20110304929Abstract: An imaging lens includes a first group having a positive or negative refractive power, a second group having a positive refractive power, a third group having a positive or negative refractive power, which are sequentially arranged from the object side of the imaging lens. The first group includes an aperture stop, and the second group includes a positive lens, and a cemented lens of a positive lens and a negative lens. The third group is composed of a cemented lens of a positive lens and a negative lens, and the following formula (1) is satisfied: 0.5?f2/f?1.2??(1), where f: focal length of the entire system of the imaging lens, and f2: focal length of the second group.Type: ApplicationFiled: December 10, 2010Publication date: December 15, 2011Applicant: FUJIFILM CORPORATIONInventor: Katsuhisa TSUTSUMI
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Patent number: 7672061Abstract: A zoom lens comprises: a stationary group that is stationary at the time of variable power; and a variable power group, disposed on an image side of the stationary group, that makes a variable power operation by moving in an optical axis direction at the time of variable power, wherein the stationary group comprises: a first lens group including a negative meniscus lens and a positive lens and having a positive refractive power as a whole; and a second lens group, disposed on the image side of the first lens group, including: a negative lens group including a negative meniscus lens and a positive lens; and a positive lens group including at least one positive lens, in order from an object side, the second lens group having a positive refractive power as a whole.Type: GrantFiled: February 14, 2008Date of Patent: March 2, 2010Assignee: Fujinon CorporationInventor: Katsuhisa Tsutsumi