Patents by Inventor Katsu Yamada
Katsu Yamada 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: 7755847Abstract: A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein: the first lens unit comprises a first lens element having a concave surface at least on the image side and negative power and a second lens element having a convex surface at least on the object side and positive power; the second lens unit comprises a single third lens element, a cemented lens element of two lens elements having power of mutually different signs and a single sixth lens element; in zooming, all of the lens units move along an optical axis; and conditions (1): 5.0<?iW<20.0 and (I-2): n11?1.9 (where, 3.Type: GrantFiled: May 27, 2008Date of Patent: July 13, 2010Assignee: Panasonic CorporationInventors: Katsu Yamada, Keiki Yoshitsugu, Yoshito Miyatake, Kazuhiko Ishimaru
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Patent number: 7742235Abstract: A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein: the first lens unit comprises a first lens element having a concave surface at least on the image side and negative power and a second lens element having a convex surface at least on the object side and positive power; the second lens unit comprises a cemented lens element fabricated by two lens elements having optical power of mutually different signs and one single lens element; in zooming, all of the lens units move along an optical axis; and conditions (1): 5.0<?iW<20.0 and (I-2): n11?1.9 (where, 3.Type: GrantFiled: May 27, 2008Date of Patent: June 22, 2010Assignee: Panasonic CorporationInventors: Keiki Yoshitsugu, Katsu Yamada, Yoshito Miyatake, Kazuhiko Ishimaru
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Patent number: 7701645Abstract: An object is to provide a zoom lens system that can realize high image quality, a large aperture and a small size simultaneously and that can optically compensate blur of the image due to hand blur, vibration or the like, an imaging device and a camera. The present invention relates to a zoom lens system, in order from the object side to the image side, comprising a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power and a fourth lens unit having positive optical power, wherein variable magnification is achieved by moving at least three lens units in an optical axis direction, focusing is achieved by moving the fourth lens unit in the optical axis direction, blur of the image is compensated by moving the third lens unit in a direction perpendicular to the optical axis, and at least one of a condition (1): 0<(|?L|·fW)/(fT·IM)<10×10?2 and a condition (2): 0.005<(|?L3|·fW)/(fT·IM)<0.15 (here, Z=fT/fW>8.Type: GrantFiled: February 20, 2006Date of Patent: April 20, 2010Assignee: Panasonic CorporationInventor: Katsu Yamada
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Publication number: 20100091170Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention comprises a plurality of lens units and an aperture diaphragm arranged in the lens unit. The plurality of lens units include a focusing lens unit that is arranged on an object side relative to the aperture diaphragm and that moves in a direction along the optical axis at the time of focusing. Further, the zoom lens system satisfies at least one of the following conditions: (1) 1.2<|fF/fW|<6.0; and (2) 0.10<|fF/fT|<1.8 (here, fT/fW>3.0, fF: a focal length of the focusing lens unit, fT: a focal length of the entire system at a telephoto limit, fW: focal length of the entire system at a wide-angle limit).Type: ApplicationFiled: April 1, 2009Publication date: April 15, 2010Applicant: Panasonic CorporationInventors: Kyoichi Miyazaki, Katsu Yamada, Takuya Imaoka, Masaki Sampei
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Publication number: 20100091172Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention comprises a plurality of lens units and an aperture diaphragm arranged in the lens unit. The plurality of lens units include: a negative lens unit that is arranged on an object side relative to the aperture diaphragm and provided with negative optical power having an absolute value greatest in the entire system and that moves in a direction along an optical axis at the time of zooming; and a focusing lens unit that is arranged in an optical path between the negative lens unit and the aperture diaphragm and that moves in a direction along the optical axis at the time of focusing such that an interval relative to the negative lens unit should vary.Type: ApplicationFiled: April 1, 2009Publication date: April 15, 2010Applicant: PANASONIC CORPORATIONInventors: Kyoichi Miyazaki, Katsu Yamada, Takuya Imaoka, Masaki Sampei, Yoshio Matsumura
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Publication number: 20100091123Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit and further that can compensate an image blur caused by vibration applied to the entire system. The zoom lens system according to the present invention comprises a plurality of lens units and an aperture diaphragm arranged in the lens unit.Type: ApplicationFiled: April 1, 2009Publication date: April 15, 2010Applicant: PANASONIC CORPORATIONInventors: Kyoichi Miyazaki, Katsu Yamada, Takuya Imaoka, Masaki Sampei
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Publication number: 20100091174Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention comprises: a positive lens unit that is arranged on an object side relative to the aperture diaphragm; a negative lens unit that is arranged on an image side relative to the positive lens unit and on an object side relative to the aperture diaphragm; and a focusing lens unit that is arranged in an optical path between the negative lens unit and the aperture diaphragm. The zoom lens system satisfies the condition (4): 1.20<?NT/?NW<4.50 (here, fT/fW>3.Type: ApplicationFiled: April 1, 2009Publication date: April 15, 2010Applicant: PANASONIC CORPORATIONInventors: Kyoichi Miyazaki, Katsu Yamada, Takuya Imaoka, Masaki Sampei
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Publication number: 20100091173Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system, in order from an object side to an image side, comprises at least: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having negative optical power; and an aperture diaphragm. At the time of zooming, the zoom lens system moves the first to third lens units so that intervals between these lens units vary. At the time of focusing from an infinity in-focus condition to a close-point object in-focus condition, the zoom lens system moves the third lens unit to the object side.Type: ApplicationFiled: April 1, 2009Publication date: April 15, 2010Applicant: PANASONIC CORPORATIONInventors: Kyoichi Miyazaki, Katsu Yamada, Takuya Imaoka, Masaki Sampei
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Publication number: 20100091171Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention, in order from an object side to an image side, comprises: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having positive optical power; and an aperture diaphragm. At the time of zooming, the zoom lens system moves the first to third lens units so that intervals between these lens units vary. At the time of focusing from an infinity in-focus condition to a close-point object in-focus condition, the zoom lens system moves the third lens unit to the object side.Type: ApplicationFiled: April 1, 2009Publication date: April 15, 2010Applicant: PANASONIC CORPORATIONInventors: Kyoichi Miyazaki, Katsu Yamada, Takuya Imaoka, Masaki Sampei
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Publication number: 20100007965Abstract: A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein: the first lens unit comprises a first lens element having a concave surface at least on the image side and negative power and a second lens element having a convex surface at least on the object side and positive power; the second lens unit comprises a first cemented lens element of two lens elements having power of mutually different signs and a second cemented lens element of two lens elements having power of mutually different signs; in zooming, all of the lens units move along an optical axis; and conditions (1): 5.0<?iW<20.0 and (I-2): n11?1.9 (where, 3.Type: ApplicationFiled: September 17, 2009Publication date: January 14, 2010Applicant: PANASONIC CORPORATIONInventors: Keiki Yoshitsugu, Katsu Yamada, Yoshito Miyatake, Kazuhiko Ishimaru
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Publication number: 20100007968Abstract: A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein: the first lens unit comprises a first lens element having a concave surface at least on the image side and negative power and a second lens element having a convex surface at least on the object side and positive power; the second lens unit comprises a first cemented lens element of two lens elements having power of mutually different signs and a second cemented lens element of two lens elements having power of mutually different signs; in zooming, all of the lens units move along an optical axis; and conditions (1): 5.0<?iW<20.0 and (I-2): n11?1.9 (where, 3.Type: ApplicationFiled: September 17, 2009Publication date: January 14, 2010Applicant: PANASONIC CORPORATIONInventors: Keiki Yoshitsugu, Katsu Yamada, Yoshito Miyatake, Kazuhiko Ishimaru
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Patent number: 7593166Abstract: A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein: the first lens unit comprises a first lens element having a concave surface at least on the image side and negative power and a second lens element having a convex surface at least on the object side and positive power; the second lens unit comprises a first cemented lens element of two lens elements having power of mutually different signs and a second cemented lens element of two lens elements having power of mutually different signs; in zooming, all of the lens units move along an optical axis; and conditions (1): 5.0<?iW<20.0 and (I-2): n11?1.9 (where, 3.Type: GrantFiled: May 27, 2008Date of Patent: September 22, 2009Assignee: Panasonic CorporationInventors: Keiki Yoshitsugu, Katsu Yamada, Yoshito Miyatake, Kazuhiko Ishimaru
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Patent number: 7586683Abstract: Provided from the object side are a first lens group (11) having a positive refracting power and fixed to the image plane, a second lens group (12) having a negative refracting power and a magnification varying action exhibited when moving along the optical axis, a third lens group (13) fixed to the image plane and having a positive refracting power, and a fourth lens group (14) movable along the optical axis so as to maintain the image plane moving with the movements of the second lens group (12) and of the object in a fixed position from a reference plane. Hence the movement of the image due to camera shake is corrected by moving the whole third lens group (13) vertically to the optical axis. The size is reduced and the aberrations are small because the whole groups whose optical performance is united are decentered.Type: GrantFiled: December 20, 2007Date of Patent: September 8, 2009Assignee: Panasonic CorporationInventors: Katsu Yamada, Shusuke Ono
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Publication number: 20090128924Abstract: An object is to provide a zoom lens system that can realize high image quality, a large aperture and a small size simultaneously and that can optically compensate blur of the image due to hand blur, vibration or the like, an imaging device and a camera. The present invention relates to a zoom lens system, in order from the object side to the image side, comprising a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power and a fourth lens unit having positive optical power, wherein variable magnification is achieved by moving at least three lens units in an optical axis direction, focusing is achieved by moving the fourth lens unit in the optical axis direction, blur of the image is compensated by moving the third lens unit in a direction perpendicular to the optical axis, and at least one of a condition (1): 0<(|?L|fW)/(fT·IM)<10×10?2 and a condition (2): 0.005<(|?L3|·fW)/(fT·IM)<0.15 (here, Z=fT/fW>8.Type: ApplicationFiled: February 20, 2006Publication date: May 21, 2009Inventor: Katsu Yamada
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Publication number: 20080297917Abstract: A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein: the first lens unit comprises a first lens element having a concave surface at least on the image side and negative power and a second lens element having a convex surface at least on the object side and positive power; the second lens unit comprises a first cemented lens element of two lens elements having power of mutually different signs and a second cemented lens element of two lens elements having power of mutually different signs; in zooming, all of the lens units move along an optical axis; and conditions (1): 5.0<?iW<20.0 and (I-2): n11?1.9 (where, 3.Type: ApplicationFiled: May 27, 2008Publication date: December 4, 2008Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Keiki Yoshitsugu, Katsu Yamada, Yoshito Miyatake, Kazuhiko Ishimaru
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Publication number: 20080297916Abstract: A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein: the first lens unit comprises a first lens element having a concave surface at least on the image side and negative power and a second lens element having a convex surface at least on the object side and positive power; the second lens unit comprises a cemented lens element fabricated by two lens elements having optical power of mutually different signs and one single lens element; in zooming, all of the lens units move along an optical axis; and conditions (1): 5.0<?i W<20.0 and (I-2): n11?1.9 (where, 3.Type: ApplicationFiled: May 27, 2008Publication date: December 4, 2008Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Keiki Yoshitsugu, Katsu Yamada, Yoshito Miyatake, Kazuhiko Ishimaru
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Publication number: 20080297915Abstract: A zoom lens system comprising a first lens unit having negative power, a second lens unit having positive power and a third lens unit having positive power, wherein: the first lens unit comprises a first lens element having a concave surface at least on the image side and negative power and a second lens element having a convex surface at least on the object side and positive power; the second lens unit comprises a single third lens element, a cemented lens element of two lens elements having power of mutually different signs and a single sixth lens element; in zooming, all of the lens units move along an optical axis; and conditions (1): 5.0<?iW<20.0 and (I-2): n11?1.9 (where, 3.Type: ApplicationFiled: May 27, 2008Publication date: December 4, 2008Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Katsu Yamada, Keiki Yoshitsugu, Yoshito Miyatake, Kazuhiko Ishimaru
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Publication number: 20080106790Abstract: Provided from the object side are a first lens group (11) having a positive refracting power and fixed to the image plane, a second lens group (12) having a negative refracting power and a magnification varying action exhibited when moving along the optical axis, a third lens group (13) fixed to the image plane and having a positive refracting power, and a fourth lens group (14) movable along the optical axis so as to maintain the image plane moving with the movements of the second lens group (12) and of the object in a fixed position from a reference plane. Hence the movement of the image due to camera shake is corrected by moving the whole third lens group (13) vertically to the optical axis. The size is reduced and the aberrations are small because the whole groups whose optical performance is united are decentered.Type: ApplicationFiled: December 20, 2007Publication date: May 8, 2008Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Katsu Yamada, Shusuke Ono
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Patent number: 7336419Abstract: Provided from the object side are a first lens group (11) having a positive refracting power and fixed to the image plane, a second lens group (12) having a negative refracting power and a magnification varying action exhibited when moving along the optical axis, a third lens group (13) fixed to the image plane and having a positive refracting power, and a fourth lens group (14) movable along the optical axis so as to maintain the image plane moving with the movements of the second lens group (12) and of the object in a fixed position from a reference plane. Hence the movement of the image due to camera shake is corrected by moving the whole third lens group (13) vertically to the optical axis. The size is reduced and the aberrations are small because the whole groups whose optical performance is united are decentered.Type: GrantFiled: February 22, 2005Date of Patent: February 26, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Katsu Yamada, Shusuke Ono
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Patent number: 7161742Abstract: A first lens group (G1) fixed with respect to the image plane includes a lens (11) having a negative refractive power, a lens (12) having a positive refractive power and a lens (13) having a positive refractive power. A second lens group (G2) has a negative refractive power as a whole, and causes a zooming action when moved along the optical axis. An aperture stop is fixed with respect to the image plane. A third lens group (G3) includes a lens (31) having a negative refractive power and a lens (32) having a positive refractive power, has a positive or negative refractive power as a whole, and is fixed with respect to the direction of the optical axis when zooming and when focusing. A fourth lens group (G4) has a positive refractive power as a whole, and moves along the optical axis such that the image plane, which is displaced by a movement of the second lens group (G2) along the optical axis and by a movement of the object, is maintained at a constant position with respect to a reference plane.Type: GrantFiled: March 8, 2004Date of Patent: January 9, 2007Assignee: Matsushita Electric Industrial Co., Ltd.Inventor: Katsu Yamada