Patents by Inventor Keiko Mizuguchi
Keiko Mizuguchi 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: 8405906Abstract: Providing a zoom lens system having a vibration reduction function capable of performing quick focusing with excellent optical performance even upon vibration reduction. The system including, in order from an object, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, and a fourth lens group G4 having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2 varies, and a distance between the second lens group G2 and the third lens group G3 varies. The third lens group G3 carries out focusing from an infinity object to a close object. At least a portion of the fourth lens group G4 moves in a direction perpendicular to the optical axis.Type: GrantFiled: September 17, 2008Date of Patent: March 26, 2013Assignee: Nikon CorporationInventors: Keiko Mizuguchi, Tomoki Ito
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Patent number: 7663802Abstract: A compact zoom lens system has a zoom ratio of about 3.5 or more, an angle of view of 29° or more in a wide-angle end, and a vibration reduction function. The system includes, in order from an object, a first group having positive power, a second group having negative power, and a third group having positive power. Upon zooming from a wide-angle end to a telephoto end, a distance between the first and second groups increases, and a distance between the second and third groups decreases. The third group consists of, in order from the object, a 31 group having positive power, a 32 group having negative power, and a 33 group. Only the 32 group is moved perpendicularly to an optical axis for correcting image blur due to camera shake.Type: GrantFiled: February 1, 2007Date of Patent: February 16, 2010Assignee: Nikon CorporationInventor: Keiko Mizuguchi
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Publication number: 20090086321Abstract: Providing a zoom lens system having a vibration reduction function capable of performing quick focusing with excellent optical performance even upon vibration reduction. The system including, in order from an object, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, and a fourth lens group G4 having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2 varies, and a distance between the second lens group G2 and the third lens group G3 varies. The third lens group G3 carries out focusing from an infinity object to a close object. At least a portion of the fourth lens group G4 moves in a direction perpendicular to the optical axis.Type: ApplicationFiled: September 17, 2008Publication date: April 2, 2009Inventors: Keiko MIZUGUCHI, Tomoki Ito
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Patent number: 7388717Abstract: The invention provides a zoom lens system suitable for an image gathering system using a solid-state imaging device, having a zoom ratio of about three, a small lens length, and superb optical performance. The zoom lens system includes, in order from an object, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power. The first lens group consists only of a negative lens and a positive lens. The second lens group includes at least two positive lenses and at least one negative lens. The third lens group consists of one lens. Zooming from a wide-angle end state to a telephoto end state is conducted by decreasing a distance between the first and second lens groups, increasing a distance between the second and third lens groups, and fixing the third lens group. Given conditions are satisfied.Type: GrantFiled: January 22, 2007Date of Patent: June 17, 2008Assignee: Nikon CorporationInventors: Keiko Mizuguchi, Atsushi Shibayama
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Patent number: 7330316Abstract: Object is to provide an inner-focusing type zoom lens system carrying out focusing by moving a portion of a first lens group suitable for an auto-focus SLR camera. A zoom lens system includes, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, and a distance between the second and the third lens groups decreases. The first lens group is composed of, in order from the object, a 1A lens group G1A having positive refractive power, and a 1B lens group G1B having positive refractive power. Focusing from infinity to a close-range object is carried out by moving only the 1B lens group G1B to the object.Type: GrantFiled: June 7, 2007Date of Patent: February 12, 2008Assignee: Nikon CorporationInventors: Atsushi Shibayama, Keiko Mizuguchi
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Publication number: 20070229974Abstract: Object is to provide an inner-focusing type zoom lens system carrying out focusing by moving a portion of a first lens group suitable for an auto-focus SLR camera. A zoom lens system includes, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, and a distance between the second and the third lens groups decreases. The first lens group is composed of, in order from the object, a 1A lens group G1A having positive refractive power, and a 1B lens group G1B having positive refractive power. Focusing from infinity to a close-range object is carried out by moving only the 1B lens group G1B to the object.Type: ApplicationFiled: June 7, 2007Publication date: October 4, 2007Inventors: Atsushi Shibayama, Keiko Mizuguchi
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Patent number: 7274519Abstract: Providing a compact zoom lens system having a high zoom ratio. The zoom lens system includes, in order from an object, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. When a state of lens group positions varies from a wide-angle end state W to a telephoto end state T, at least the first lens group G1 and the third lens group G3 are moved along the optical axis to the object. Given conditional expressions are satisfied.Type: GrantFiled: March 28, 2006Date of Patent: September 25, 2007Assignee: Nikon CorporationInventors: Hiroshi Yamamoto, Keiko Mizuguchi
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Publication number: 20070183042Abstract: Providing a compact zoom lens system suitable for a single-lens reflex camera using a solid-state imaging device, having a zoom ratio of about 3.5 or more, an angle of view of 29° or more in a wide-angle end, and a vibration reduction function. The system includes, in order from an object, a first group having positive power, a second group having negative power, and a third group having positive power. Upon zooming from a wide-angle end to a telephoto end, a distance between the first and second groups increases, and a distance between the second and third groups decreases. The third group consists of, in order from the object, a 31 group having positive power, a 32 group having negative power, and a 33 group. Only the 32 group is moved perpendicularly to an optical axis for correcting an image blur upon generating a camera shake. Given conditions are satisfied.Type: ApplicationFiled: February 1, 2007Publication date: August 9, 2007Inventor: Keiko Mizuguchi
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Patent number: 7242532Abstract: Object is to provide an inner-focusing type zoom lens system carrying out focusing by moving a portion of a first lens group suitable for an auto-focus SLR camera. A zoom lens system includes, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, and a distance between the second and the third lens groups decreases. The first lens group is composed of, in order from the object, a 1A lens group G1A having positive refractive power, and a 1B lens group G1B having positive refractive power. Focusing from infinity to a close-range object is carried out by moving only the 1B lens group G1B to the object.Type: GrantFiled: June 5, 2006Date of Patent: July 10, 2007Assignee: Nikon CorporationInventors: Atsushi Shibayama, Keiko Mizuguchi
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Publication number: 20070115559Abstract: The invention provides a zoom lens system suitable for an image gathering system using a solid-state imaging device, having a zoom ratio of about three, a small lens length, and superb optical performance. The zoom lens system includes, in order from an object, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power. The first lens group consists only of a negative lens and a positive lens. The second lens group includes at least two positive lenses and at least one negative lens. The third lens group consists of one lens. Zooming from a wide-angle end state to a telephoto end state is conducted by decreasing a distance between the first and second lens groups, increasing a distance between the second and third lens groups, and fixing the third lens group. Given conditions are satisfied.Type: ApplicationFiled: January 22, 2007Publication date: May 24, 2007Inventors: Keiko Mizuguchi, Atsushi shibayama
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Patent number: 7180683Abstract: The invention provides a zoom lens system suitable for an image gathering system using a solid-state imaging device, having a zoom ratio of about three, a small lens length, and superb optical performance. The zoom lens system includes, in order from an object, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power. The first lens group consists only of a negative lens and a positive lens. The second lens group includes at least two positive lenses and at least one negative lens. The third lens group consists of one lens. Zooming from a wide-angle end state to a telephoto end state is conducted by decreasing a distance between the first and second lens groups, increasing a distance between the second and third lens groups, and fixing the third lens group. Given conditions are satisfied.Type: GrantFiled: March 17, 2005Date of Patent: February 20, 2007Assignee: Nikon CorporationInventors: Keiko Mizuguchi, Atsushi Shibayama
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Patent number: 7161746Abstract: An object of the present invention is to provide a fisheye lens, in spite of its compactness, having an angle of view of 180 degrees and a fast f-number of 2.8 with securing sufficient back focal length and suitable for a digital camera. The fisheye lens consists of a front lens group G1 having negative refractive power and a rear lens group G2 having positive refractive power locating with a space along the optical axis apart from the front lens group G1. The front lens group G1 includes a plurality of negative lens components, L1 and L2. The rear lens group G2 includes at least one cemented lens L5, and given conditional expressions are satisfied.Type: GrantFiled: December 10, 2004Date of Patent: January 9, 2007Assignee: Nikon CorporationInventor: Keiko Mizuguchi
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Publication number: 20060245079Abstract: Providing a compact zoom lens system having a high zoom ratio. The zoom lens system includes, in order from an object, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power. When a state of lens group positions varies from a wide-angle end state W to a telephoto end state T, at least the first lens group G1 and the third lens group G3 are moved along the optical axis to the object. Given conditional expressions are satisfied.Type: ApplicationFiled: March 28, 2006Publication date: November 2, 2006Inventors: Hiroshi Yamamoto, Keiko Mizuguchi
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Publication number: 20060221464Abstract: Object is to provide an inner-focusing type zoom lens system carrying out focusing by moving a portion of a first lens group suitable for an auto-focus SLR camera. A zoom lens system includes, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, and a distance between the second and the third lens groups decreases. The first lens group is composed of, in order from the object, a 1A lens group G1A having positive refractive power, and a 1B lens group G1B having positive refractive power. Focusing from infinity to a close-range object is carried out by moving only the 1B lens group G1B to the object.Type: ApplicationFiled: June 5, 2006Publication date: October 5, 2006Inventors: Atsushi Shibayama, Keiko Mizuguchi
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Publication number: 20050219708Abstract: Object is to provide an inner-focusing type zoom lens system carrying out focusing by moving a portion of a first lens group suitable for an auto-focus SLR camera. A zoom lens system includes, in order from an object, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first and the second lens groups increases, and a distance between the second and the third lens groups decreases. The first lens group is composed of, in order from the object, a 1A lens group G1A having positive refractive power, and a 1B lens group G1B having positive refractive power. Focusing from infinity to a close-range object is carried out by moving only the 1B lens group G1B to the object.Type: ApplicationFiled: March 29, 2005Publication date: October 6, 2005Inventors: Atsushi Shibayama, Keiko Mizuguchi
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Publication number: 20050157405Abstract: The invention provides a zoom lens system suitable for an image gathering system using a solid-state imaging device, having a zoom ratio of about three, a small lens length, and superb optical performance. The zoom lens system includes, in order from an object, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power. The first lens group consists only of a negative lens and a positive lens. The second lens group includes at least two positive lenses and at least one negative lens. The third lens group consists of one lens. Zooming from a wide-angle end state to a telephoto end state is conducted by decreasing a distance between the first and second lens groups, increasing a distance between the second and third lens groups, and fixing the third lens group. Given conditions are satisfied.Type: ApplicationFiled: March 17, 2005Publication date: July 21, 2005Inventors: Keiko Mizuguchi, Atsushi Shibayama
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Publication number: 20050094286Abstract: An object of the present invention is to provide a fisheye lens, in spite of its compactness, having an angle of view of 180 degrees and a fast f-number of 2.8 with securing sufficient back focal length and suitable for a digital camera. The fisheye lens consists of a front lens group G1 having negative refractive power and a rear lens group G2 having positive refractive power locating with a space along the optical axis apart from the front lens group G1. The front lens group G1 includes a plurality of negative lens components, L1 and L2. The rear lens group G2 includes at least one cemented lens L5, and given conditional expressions are satisfied.Type: ApplicationFiled: December 10, 2004Publication date: May 5, 2005Inventor: Keiko Mizuguchi
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Publication number: 20050013014Abstract: The invention provides a zoom lens system suitable for an image gathering system using a solid-state imaging device, having a zoom ratio of about three, a small lens length, and superb optical performance. The zoom lens system includes, in order from an object, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power. The first lens group consists only of a negative lens and a positive lens. The second lens group includes at least two positive lenses and at least one negative lens. The third lens group consists of one lens. Zooming from a wide-angle end state to a telephoto end state is conducted by decreasing a distance between the first and second lens groups, increasing a distance between the second and third lens groups, and fixing the third lens group. Given conditions are satisfied.Type: ApplicationFiled: August 29, 2003Publication date: January 20, 2005Inventors: Keiko Mizuguchi, Atsushi Shibayama
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Patent number: 6844991Abstract: An object of the present invention is to provide a fisheye lens, in spite of its compactness, having an angle of view of 180 degrees and a fast f-number of 2.8 with securing sufficient back focal length and suitable for a digital camera. The fisheye lens consists of a front lens group G1 having negative refractive power and a rear lens group G2 having positive refractive power locating with a space along the optical axis apart from the front lens group G1. The front lens group G1 includes a plurality of negative lens components, L1 and L2. The rear lens group G2 includes at least one cemented lens L5, and given conditional expressions are satisfied.Type: GrantFiled: August 1, 2003Date of Patent: January 18, 2005Assignee: Nikon CorporationInventor: Keiko Mizuguchi
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Patent number: 6833964Abstract: The present invention provides a zoom lens system suitable for an image gathering system using a solid-state imaging device, having a zoom ratio of about three, a small total lens length, and superb optical performance. According to one aspect, in order from the object side, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power. Zooming is carried out by varying distances between adjacent lens groups. The first lens group includes two negative lens elements and a positive lens element. The second lens group includes three lens elements consisting of a first positive lens element, a second positive lens element, and a negative lens element. The third lens group includes at least one positive lens element. Predetermined conditional expressions are satisfied.Type: GrantFiled: April 18, 2002Date of Patent: December 21, 2004Assignee: Nikon CorporationInventors: Keiko Mizuguchi, Atsushi Shibayama