Patents by Inventor Hiroyuki Hamano

Hiroyuki Hamano 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: 6606194
    Abstract: A variable magnification optical system having an image stabilizing function includes, in order from an object side to an image side, a fixed first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power. The second lens unit and the fourth lens unit are moved to effect variation of magnification. The third lens unit has a negative lens of meniscus form concave toward the image side and an aspheric surface, and the third lens unit is movable in a direction perpendicular to an optical axis to stabilize an image, or a lens sub-unit constituting part of the third lens unit is movable in the direction perpendicular to the optical axis to stabilize an image.
    Type: Grant
    Filed: November 30, 2001
    Date of Patent: August 12, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyuki Hamano, Hiroki Yoshida
  • Patent number: 6606200
    Abstract: A zoom lens device including a diffraction optical element constructed in a new way. In a basic form of the invention, the zoom lens device includes in order of lens units from a long conjugate side, at least a first lens unit including the diffraction optical element, a second lens unit which is moved during zooming in order to change the size of an image, and a third lens unit. In this zoom lens device, during zooming at least one of the lens units from the third lens unit onwards is moved in order to correct a change in an image plane which occurs as the magnification changes.
    Type: Grant
    Filed: October 19, 1999
    Date of Patent: August 12, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroki Nakayama, Hiroyuki Hamano, Hiroki Yoshida
  • Publication number: 20030133201
    Abstract: A zoom lens is constructed with, in order from an object side to an image side, a first lens unit of negative optical power, the first lens unit including a negative meniscus lens having a concave surface facing the image side and a positive meniscus lens having a convex surface facing the object side, a second lens unit of positive optical power, the second lens unit including a cemented lens of positive optical power as a whole disposed on the most image side of the second lens unit, and a lens having a concave surface facing the image side and adjoining a surface on the object side of the cemented lens, and a third lens unit of positive optical power, wherein a separation between the first lens unit and the second lens unit and a separation between the second lens unit and the third lens unit are varied to effect variation of magnification.
    Type: Application
    Filed: July 16, 2002
    Publication date: July 17, 2003
    Applicant: Canon Kabushiki Kaisha
    Inventors: Norihiro Nanba, Koji Hoshi, Hiroyuki Hamano, Makoto Sekita
  • Patent number: 6577450
    Abstract: A zoom lens which has good optical performance with the number of lenses reduced as a result of forming a diffraction optical surface is disclosed. The zoom lens includes, in order from object side to image side, a first lens unit consisting of a positive lens element and having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power. When zooming is performed from a wide angle end to a telephoto end, the first lens unit and the third lens unit are moved so that, at the telephoto end, they are closer to the object side, and the second lens unit is moved so that, at the telephoto end, it is closer to the image side. The zoom lens further includes at least one diffraction optical surface.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: June 10, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyuki Hamano, Hiroshi Saruwatari
  • Patent number: 6545819
    Abstract: A zoom lens is constructed with, in order from an object side to an image side, a first lens unit of negative optical power, the first lens unit including a negative meniscus lens having a concave surface facing the image side and a positive meniscus lens having a convex surface facing the object side, a second lens unit of positive optical power, the second lens unit including a cemented lens of positive optical power as a whole disposed on the most image side of the second lens unit, and a lens having a concave surface facing the image side and adjoining a surface on the object side of the cemented lens, and a third lens unit of positive optical power, wherein a separation between the first lens unit and the second lens unit and a separation between the second lens unit and the third lens unit are varied to effect variation of magnification.
    Type: Grant
    Filed: August 29, 2000
    Date of Patent: April 8, 2003
    Assignee: Canon Kabushiki Kaisha
    Inventors: Norihiro Nanba, Koji Hoshi, Hiroyuki Hamano, Makoto Sekita
  • Patent number: 6498687
    Abstract: A zoom lens includes a lens unit A of negative refractive power, and a lens unit B of positive refractive power disposed on an image side of the lens unit A. The lens unit B includes two cemented lens components and consists of not more than five lens elements. Then, the separation between the lens unit A and the lens unit B varies during zooming.
    Type: Grant
    Filed: October 3, 2000
    Date of Patent: December 24, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Makoto Sekita, Hiroyuki Hamano
  • Patent number: 6473231
    Abstract: A variable magnification optical system having an image stabilizing function includes, in order from an object side to an image side, a fixed first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power. The second lens unit and the fourth lens unit are moved to effect variation of magnification. The third lens unit has a negative lens of meniscus form concave toward the image side and an aspheric surface, and the third lens unit is movable in a direction perpendicular to an optical axis to stabilize an image, or a lens sub-unit constituting part of the third lens unit is movable in the direction perpendicular to the optical axis to stabilize an image.
    Type: Grant
    Filed: February 17, 1999
    Date of Patent: October 29, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroyuki Hamano, Hiroki Yoshida
  • Patent number: 6414800
    Abstract: A variable magnification optical system includes, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power arranged to move along an optical axis during variation of magnification, the second lens unit including, in order from the object side to the image side, a first lens (L21) of negative refractive power and of meniscus form having a concave surface facing the image side, a second lens (L22) of negative refractive power, a third lens (L23) of positive refractive power and a fourth lens (L24) of negative refractive power, a third lens unit of positive refractive power, at least a part of the third lens unit being moved in such a way as to have a component perpendicular to the optical axis to displace an image formed by the variable magnification optical system, and a fourth lens unit of positive refractive power arranged to move along the optical axis during the variation of magnification, wherein the following condition
    Type: Grant
    Filed: May 2, 2000
    Date of Patent: July 2, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Hamano
  • Publication number: 20020063961
    Abstract: A variable magnification optical system having an image stabilizing function includes, in order from an object side to an image side, a fixed first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power. The second lens unit and the fourth lens unit are moved to effect variation of magnification. The third lens unit has a negative lens of meniscus form concave toward the image side and an aspheric surface, and the third lens unit is movable in a direction perpendicular to an optical axis to stabilize an image, or a lens sub-unit constituting part of the third lens unit is movable in the direction perpendicular to the optical axis to stabilize an image.
    Type: Application
    Filed: November 30, 2001
    Publication date: May 30, 2002
    Inventors: Hiroyuki Hamano, Hiroki Yoshida
  • Publication number: 20020063969
    Abstract: A zoom lens which has good optical performance with the number of lenses used reduced as a result of forming a diffraction optical surface is disclosed. More specifically, there is disclosed a zoom lens that includes, in order of lens units from an object side to an image side, a first lens unit consisting of a positive lens element and having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power. When zooming is performed from a wide angle end to a telephoto end, the first lens unit and the third lens unit are moved so that, at the telephoto end, they are positioned closer to the object side than to the wide angle end, and the second lens unit is moved so that, at the telephoto end, it is positioned closer to the image side than to the wide angle end. The zoom lens further includes at least one diffraction optical surface.
    Type: Application
    Filed: September 25, 2001
    Publication date: May 30, 2002
    Inventors: Hiroyuki Hamano, Hiroshi Saruwatari
  • Patent number: 6392816
    Abstract: A variable magnification optical system includes, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power, a fourth lens unit of negative refractive power and a fifth lens unit of positive refractive power. In the variable magnification optical system, at least the second lens unit and the fourth lens unit are moved along an optical axis during variation of magnification, and the third lens unit is moved in such a way as to have a component having directions perpendicular to the optical axis to displace an image formed by the variable magnification optical system.
    Type: Grant
    Filed: October 24, 2000
    Date of Patent: May 21, 2002
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Hamano
  • Publication number: 20020024732
    Abstract: A variable magnification optical system having an image stabilizing function includes, in order from an object side to an image side, a fixed first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refractive power. The second lens unit and the fourth lens unit are moved to effect variation of magnification. The third lens unit has a negative lens of meniscus form concave toward the image side and an aspheric surface, and the third lens unit is movable in a direction perpendicular to an optical axis to stabilize an image, or a lens sub-unit constituting part of the third lens unit is movable in the direction perpendicular to the optical axis to stabilize an image.
    Type: Application
    Filed: February 17, 1999
    Publication date: February 28, 2002
    Inventors: HIROYUKI HAMANO, HIROKI YOSHIDA
  • Patent number: 5963378
    Abstract: A zoom lens is disclosed, comprising, from front to rear, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive reactive power and a fourth lens unit of positive refractive power, an aperture stop being positioned between the second and third lens units, the second and fourth lens unit being axially moved to effect zooming and the fourth lens unit being axially moved to effect focusing, wherein particular rules of design are set fourth for the third and fourth lens units to insure that the back focal distance is long enough to contain a color separation prism, and wherein the zoom ratio takes a high value.
    Type: Grant
    Filed: March 27, 1995
    Date of Patent: October 5, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Nobuyuki Tochigi, Hiroyuki Hamano
  • Patent number: 5933283
    Abstract: A zoom lens comprises, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power and a fourth lens unit having a positive refractive power, wherein at least the second and fourth lens units are moved to vary magnification and the fourth lens unit is moved to effect focusing, and wherein the third lens unit is composed of one positive lens and one negative lens and an aperture stop is disposed between the positive lens and the negative lens in the third lens unit.
    Type: Grant
    Filed: April 4, 1997
    Date of Patent: August 3, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Hamano
  • Patent number: 5905530
    Abstract: An image pickup apparatus is disclosed which is provided with a distortional-aberration memorizing element for memorizing distortional-aberration information about an objective lens, a state-of-objective-lens detecting circuit for detecting a state of the objective lens, an image correcting circuit for reading out distortional-aberration information about distortional aberration occurring during photography from the distortional-aberration memorizing element on the basis of information supplied from the state-of-objective-lens detecting circuit, and electrically correcting a distortion of an image due to the objective lens with a predetermined image height in a photographed image selected as a datum.
    Type: Grant
    Filed: February 7, 1996
    Date of Patent: May 18, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideo Yokota, Hiroyuki Hamano, Masaharu Suzuki, Yasuhiro Tamekuni, Takashi Kato, Katsumi Azusawa, Hidekage Sato
  • Patent number: 5818646
    Abstract: A zoom lens of the rear focus type is disclosed, comprising, in order from an object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power, a fourth lens unit of positive refractive power and a fifth lens unit of negative refractive power, wherein at least the second lens unit and the fourth lens unit are moved to vary magnification and the fourth lens unit is moved to effect focusing, and wherein an aperture stop is located in a space between the third lens unit and the fourth lens unit.
    Type: Grant
    Filed: November 7, 1997
    Date of Patent: October 6, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Hamano
  • Patent number: 5774275
    Abstract: A variable magnification viewfinder is disclosed, comprising, from front to rear, at least a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit, a fourth lens unit of positive refractive power and a fifth lens unit, wherein zooming is performed by varying air separations between every successive two of the lens units.
    Type: Grant
    Filed: August 10, 1995
    Date of Patent: June 30, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Hamano
  • Patent number: 5771123
    Abstract: A zoom lens comprises a plurality of lens units, in which at least one of lens unit separations in the plurality of lens units is varied to vary a focal length, an aperture stop, and a variable angle prism unit disposed on an image side of the aperture stop and having an apex angle varied to refract light, the zoom lens satisfying the following conditions:1.16<Lv/Fw<3.906.2<L1/Fw<17.0where Lv is a distance between the aperture stop and a driven surface of the variable angle prism unit, Fw is a focal length in a wide-angle end of the zoom lens, and L1 is a distance between the driven surface of the variable angle prism unit and a lens surface closest to an object side in the zoom lens.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: June 23, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Hamano
  • Patent number: 5751496
    Abstract: A zoom lens of the rear focus type is disclosed, comprising, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power, a fourth lens unit of positive refractive power and a fifth lens unit of negative refractive power, wherein at least the second lens unit and the fourth lens unit are moved to vary magnification and the fourth lens unit is moved to effect focusing, and wherein the third lens unit comprises, in order from the object side to the image side, a positive lens and a negative lens having a strong concave surface facing the image side.
    Type: Grant
    Filed: May 24, 1996
    Date of Patent: May 12, 1998
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Hamano
  • Patent number: 5677792
    Abstract: A zooming optical system provided with a variable angle prism member of which the vertical angle is variable, and designed such that the vertical angle of the prism member is varied by a drive force applied from outside to thereby deflect a beam of light, wherein provision is made of a first lens unit having positive refractive power and a plurality of lens units including a movable lens unit rearwardly of the first lens unit, the first lens unit is divided into a front lens unit of negative refractive power and a rear lens unit of positive refractive power, and the prism member is disposed between the front lens unit and the rear lens unit.
    Type: Grant
    Filed: October 4, 1994
    Date of Patent: October 14, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventor: Hiroyuki Hamano