Patents by Inventor Tsuyoshi Wakazono
Tsuyoshi Wakazono 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).
-
Patent number: 8179609Abstract: Provided is a zoom lens including, in order from an object side to an image side: a positive first lens unit without moving for zooming; a negative second lens unit moving during zooming; a negative third lens unit moving during zooming; a positive fourth lens unit moving during zooming; and a positive fifth lens unit without moving for zooming, in which the second lens unit moves to the image side during zooming from a wide angle end to a telephoto end, while the third lens unit moves along a locus convex toward the object side, and, when fw denotes a focal length of the entire system at the wide angle end, Z a zoom ratio, and fz a focal length of the entire system at a zoom position where the third lens unit is in the position closest to the object side, the following conditional expression is satisfied: fw×Z0.07<fz<fw×Z0.5.Type: GrantFiled: October 18, 2010Date of Patent: May 15, 2012Assignee: Canon Kabushiki KaishaInventor: Tsuyoshi Wakazono
-
Publication number: 20110090373Abstract: Provided is a zoom lens including, in order from an object side to an image side: a positive first lens unit without moving for zooming; a negative second lens unit moving during zooming; a negative third lens unit moving during zooming; a positive fourth lens unit moving during zooming; and a positive fifth lens unit without moving for zooming, in which the second lens unit moves to the image side during zooming from a wide angle end to a telephoto end, while the third lens unit moves along a locus convex toward the object side, and, when fw denotes a focal length of the entire system at the wide angle end, Z a zoom ratio, and fz a focal length of the entire system at a zoom position where the third lens unit is in the position closest to the object side, the following conditional expression is satisfied: fw×Z0.07<fz<fw×Z0.5.Type: ApplicationFiled: October 18, 2010Publication date: April 21, 2011Applicant: CANON KABUSHIKI KAISHAInventor: Tsuyoshi Wakazono
-
Patent number: 7929222Abstract: A zoom lens system includes four lens units each having positive, negative, negative and positive refractive powers in the stated order from an object side to an image side. A first lens unit includes a variable apex angle prism on the image side of at least one lens element. In this zoom lens system, a focal length of the first lens unit and imaging magnifications of a second lens unit and a fourth lens unit are set appropriately so as to suppress occurrence of decentering aberration accompanying a variation of a prism apex angle.Type: GrantFiled: May 18, 2009Date of Patent: April 19, 2011Assignee: Canon Kabushiki KaishaInventors: Tsuyoshi Wakazono, Ryuji Nurishi, Masaru Sakamoto, Masakazu Kodaira
-
Patent number: 7907355Abstract: A zoom lens system includes, in order from the object side to the image side, four lens units having positive, negative, negative and positive refractive powers. A first lens unit includes, in order from the object side to the image side: a front subunit having a negative refractive power; a middle subunit that has a positive refractive power and moves during focusing; and a rear subunit having a positive refractive power. The zoom lens system further includes a variable apex angle prism disposed on the image side of the front subunit. An average Abbe number of materials of a negative lens element and a positive lens element included in the front subunit is set appropriately so as to suppress occurrence of decentering aberration accompanying a variation of a prism apex angle.Type: GrantFiled: May 18, 2009Date of Patent: March 15, 2011Assignee: Canon Kabushiki KaishaInventors: Masakazu Kodaira, Tsuyoshi Wakazono, Masaru Sakamoto, Ryuji Nurishi
-
Publication number: 20110051256Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an aperture stop, a third lens unit having a positive refractive power, and a rear group including at least one lens unit. During zooming from a wide angle end to a telephoto end, the first and third lens units move to the object side, the second lens unit moves to the image side, and the aperture stop moves to the object side along a convex path. Radii of curvature of object- and image-side lens surfaces of a lens closest to the object side in the second lens unit, focal lengths of the entire zoom lens at the wide angle end and the telephoto end, and focal lengths of the first and second lens units are set properly.Type: ApplicationFiled: August 6, 2010Publication date: March 3, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Chiaki Inoue, Tsuyoshi Wakazono
-
Publication number: 20110037878Abstract: A zoom lens including in order from an object side to an image side: a positive first lens unit which does not move for zooming; a negative second lens unit for magnification, and a rear lens group including two or more lens units, in which: the first lens unit includes a first subunit not moving for focusing and a second subunit moving for focusing, and the first subunit includes two or more negative lenses and one or more positive lenses; and an average Abbe number and an average partial dispersion ratio of materials of the negative lenses included in the first subunit, average Abbe number and average partial dispersion ratio of materials of the one or more positive lenses included in the first lens unit, combined focal length of the negative lenses included in the first subunit, and focal length of the zoom lens at telephoto end are appropriately set.Type: ApplicationFiled: August 2, 2010Publication date: February 17, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Tsuyoshi Wakazono, Masao Hori
-
Patent number: 7630145Abstract: A zoom lens has, in order from the object side to the image side, a first lens unit that does not move during zooming and has positive refractive power, a second lens unit that performs zooming and has negative refractive power, a third lens unit that corrects image plane variation caused by zooming and has negative refractive power, and a fourth lens unit that does not move during zooming and has positive refractive power. The first lens unit has, in order from the object side to the image side, a first lens subunit that does not move during focusing and has negative refractive power, a second lens subunit that is configured to move along the optical axis during focusing and has positive refractive power, a third lens subunit that does not move during focusing and has positive refractive power. The second lens subunit has at least one aspherical lens surface AS12.Type: GrantFiled: August 6, 2008Date of Patent: December 8, 2009Assignee: Canon Kabushiki KaishaInventors: Tsuyoshi Wakazono, Tomoyuki Nakamura
-
Publication number: 20090290230Abstract: A zoom lens system includes four lens units each having positive, negative, negative and positive refractive powers in the stated order from an object side to an image side. A first lens unit includes a variable apex angle prism on the image side of at least one lens element. In this zoom lens system, a focal length of the first lens unit and imaging magnifications of a second lens unit and a fourth lens unit are set appropriately so as to suppress occurrence of decentering aberration accompanying a variation of a prism apex angle.Type: ApplicationFiled: May 18, 2009Publication date: November 26, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Tsuyoshi Wakazono, Ryuji Nurishi, Masaru Sakamoto, Masakazu Kodaira
-
Publication number: 20090290229Abstract: A zoom lens system includes, in order from the object side to the image side, four lens units having positive, negative, negative and positive refractive powers. A first lens unit includes, in order from the object side to the image side: a front subunit having a negative refractive power; a middle subunit that has a positive refractive power and moves during focusing; and a rear subunit having a positive refractive power. The zoom lens system further includes a variable apex angle prism disposed on the image side of the front subunit. An average Abbe number of materials of a negative lens element and a positive lens element included in the front subunit is set appropriately so as to suppress occurrence of decentering aberration accompanying a variation of a prism apex angle.Type: ApplicationFiled: May 18, 2009Publication date: November 26, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Masakazu Kodaira, Tsuyoshi Wakazono, Masaru Sakamoto, Ryuji Nurishi
-
Publication number: 20090046375Abstract: A zoom lens has, in order from the object side to the image side, a first lens unit that does not move during zooming and has positive refractive power, a second lens unit that performs zooming and has negative refractive power, a third lens unit that corrects image plane variation caused by zooming and has negative refractive power, and a fourth lens unit that does not move during zooming and has positive refractive power. The first lens unit has, in order from the object side to the image side, a first lens subunit that does not move during focusing and has negative refractive power, a second lens subunit that is configured to move along the optical axis during focusing and has positive refractive power, a third lens subunit that does not move during focusing and has positive refractive power. The second lens subunit has at least one aspherical lens surface AS12.Type: ApplicationFiled: August 6, 2008Publication date: February 19, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Tsuyoshi Wakazono, Tomoyuki Nakamura
-
Patent number: 7355646Abstract: A drive control apparatus has a controller which operates in a first mode carrying out auto focusing control and a second mode not carrying out auto focusing control and carries out control so as to drive forcibly a magnification-varying lens unit to a wide-angle end or telephoto end when switching from the first mode to the second mode.Type: GrantFiled: March 23, 2004Date of Patent: April 8, 2008Assignee: Canon Kabushiki KaishaInventor: Tsuyoshi Wakazono
-
Patent number: 7289280Abstract: At least one exemplary embodiment is directed to a zoom lens which includes, in order from an object side to an image side, a first lens unit having positive refractive power and is stationary during zooming, a second lens unit configured to move to perform zooming, a third lens unit configured to move to compensate for variation of an image plane caused by zooming, and a fourth lens unit having positive refractive power and is also stationary during zooming. The first lens unit includes, in order from the object side to an image side, a first lens subunit having positive refractive power and is stationary during focusing, a second lens subunit having positive refractive power, and a third lens subunit having negative refractive power and is also stationary during focusing. The second lens subunit moves along an optical axis during focusing.Type: GrantFiled: October 25, 2006Date of Patent: October 30, 2007Assignee: Canon Kabushiki KaishaInventor: Tsuyoshi Wakazono
-
Publication number: 20070109665Abstract: At least one exemplary embodiment is directed to a zoom lens which includes, in order from an object side to an image side, a first lens unit having positive refractive power and is stationary during zooming, a second lens unit configured to move to perform zooming, a third lens unit configured to move to compensate for variation of an image plane caused by zooming, and a fourth lens unit having positive refractive power and is also stationary during zooming. The first lens unit includes, in order from the object side to an image side, a first lens subunit having positive refractive power and is stationary during focusing, a second lens subunit having positive refractive power, and a third lens subunit having negative refractive power and is also stationary during focusing. The second lens subunit moves along an optical axis during focusing.Type: ApplicationFiled: October 25, 2006Publication date: May 17, 2007Applicant: CANON KABUSHIKI KAISHAInventor: Tsuyoshi Wakazono
-
Patent number: 7106530Abstract: Provided is an optical system having an image rotating function disposed on an image side with respect to an image pick up lens, which makes it possible that its optical performance is satisfactory, an eclipse amount is small, a field angle and an F number intended by a photographer are obtained, and compactness is achieved. The optical system is an optical system mountable to the image pick up lens. The optical system includes: an image rotator which is disposed on the image side with respect to a first imaging plane of the image pick up lens and has an incident optical axis and an emission optical axis made coaxial to each other; a first lens unit having a negative optical power which is disposed between the image pick up lens and the first imaging plane; a second lens unit having a positive optical power which is disposed between the first imaging plane and the image rotator; and a third lens unit having a positive optical power which is disposed on the image side with respect to the image rotator.Type: GrantFiled: March 9, 2005Date of Patent: September 12, 2006Assignee: Canon Kabushiki KaishaInventor: Tsuyoshi Wakazono
-
Patent number: 7057827Abstract: A zoom lens includes first to fourth lens units arranged in order from an object, respectively. The first lens unit is fixed during power-varying and has positive optical power. The second lens unit is movable during power-varying. The third lens unit is movable so as to compensate image-plane fluctuation in accordance with the power-varying. The fourth lens unit is fixed during the power-varying and has positive optical power. The first lens unit includes a first lens subunit having positive optical power, and a second lens subunit having negative optical power, arranged in order from the object, respectively. One of the first and second lens subunits moves upon focus adjustment. Further, the following conditions are satisfied: ?2.5<f1b/f1a<?0.6 and 0.2<f1/fT<0.8. Wherein f1, f1a, f1b, and fT respectively represent the focal lengths of the first lens unit, the first lens subunit, the second lens subunit, and the overall system of the zoom lens at its telephoto end.Type: GrantFiled: March 29, 2005Date of Patent: June 6, 2006Assignee: Canon Kabushiki KaishaInventor: Tsuyoshi Wakazono
-
Publication number: 20050219709Abstract: A zoom lens includes first to fourth lens units arranged in order from an object, respectively. The first lens unit is fixed during power-varying and has positive optical power. The second lens unit is movable during power-varying. The third lens unit is movable so as to compensate image-plane fluctuation in accordance with the power-varying. The fourth lens unit is fixed during the power-varying and has positive optical power. The first lens unit includes a first lens subunit having positive optical power, and a second lens subunit having negative optical power, arranged in order from the object, respectively. One of the first and second lens subunits moves upon focus adjustment. Further, the following conditions are satisfied: ?2.5<f1b/f1a<?0.6 and 0.2<f1/fT<0.8. Wherein f1, f1a, f1b, and fT respectively represent the focal lengths of the first lens unit, the first lens subunit, the second lens subunit, and the overall system of the zoom lens at its telephoto end.Type: ApplicationFiled: March 29, 2005Publication date: October 6, 2005Applicant: Canon Kabushiki KaishaInventor: Tsuyoshi Wakazono
-
Publication number: 20050207030Abstract: Provided is an optical system having an image rotating function disposed on an image side with respect to an image pick up lens, which makes it possible that its optical performance is satisfactory, an eclipse amount is small, a field angle and an F number intended by a photographer are obtained, and compactness is achieved. The optical system is an optical system mountable to the image pick up lens. The optical system includes: an image rotator which is disposed on the image side with respect to a first imaging plane of the image pick up lens and has an incident optical axis and an emission optical axis made coaxial to each other; a first lens unit having a negative optical power which is disposed between the image pick up lens and the first imaging plane; a second lens unit having a positive optical power which is disposed between the first imaging plane and the image rotator; and a third lens unit having a positive optical power which is disposed on the image side with respect to the image rotator.Type: ApplicationFiled: March 9, 2005Publication date: September 22, 2005Inventor: Tsuyoshi Wakazono
-
Publication number: 20040189858Abstract: A drive control apparatus for an optical apparatus is disclosed, which is capable of making defocusing when switching from an AF mode to an MF mode unnoticeable and quickly correcting the defocusing. The optical apparatus includes a manually operated first focus lens unit, a second focus lens unit driven under auto focusing control and a magnification-varying lens unit. The drive control apparatus includes a controller which operates in a first mode carrying out auto focusing control and a second mode carrying out no auto focusing control. When switching from the first mode to the second mode, the controller carries out control so as to drive the second focus lens unit to a first predetermined position and drive the magnification-varying lens unit to a second predetermined position.Type: ApplicationFiled: March 23, 2004Publication date: September 30, 2004Inventor: Tsuyoshi Wakazono