Patents by Inventor Kenzaburo Suzuki

Kenzaburo Suzuki 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: 7545573
    Abstract: A projector optical system for forming a real image by projecting an image of a display element has, sequentially from a screen side or an observation side, a first lens group having positive refractive power, an aperture diaphragm, a second lens group, and a third lens group having positive refractive power, with a diffractive optical element being provided on at least one of the first lens group and the second lens group which are adjacent to the aperture diaphragm. The projector optical system satisfies: 0.05<G/L<0.9 wherein G is an air gap on the optical axis between the second lens group and the third lens group, and L is a length on the optical axis, from the surface that is closest to the screen side to the display element.
    Type: Grant
    Filed: January 4, 2008
    Date of Patent: June 9, 2009
    Assignee: Nikon Corporation
    Inventor: Kenzaburo Suzuki
  • Patent number: 7511897
    Abstract: A projector optical system for forming a real image by projecting an image of a display element is constituted by, sequentially from a projection side, an aperture diaphragm; and a first lens group having positive refractive power and having, in the interior thereof or on a lens surface at a projection side or at a display element side, a diffraction optical surface formed by a multilayer-type diffractive optical element in which diffraction gratings formed on two diffractive element components are arranged facing each other. The projector optical system is configured so as to satisfy the following expression 0.1<K/L<1.5 wherein L is a total length on an optical axis, and K is a distance on the optical axis from the aperture diaphragm to a surface of the first lens group that is closest to the projection side, and satisfy also the following expression 0.01<?Nd<0.45 wherein ?Nd is a difference between refractive indices of the two diffractive element components for a main wavelength (d-line).
    Type: Grant
    Filed: July 16, 2007
    Date of Patent: March 31, 2009
    Assignee: Nikon Corporation
    Inventor: Kenzaburo Suzuki
  • Publication number: 20090052040
    Abstract: A diffractive optical element 10 is constituted by sandwiching and closely bonding first and second optical element components 13, 14 which have different refractive indices and are adhered via a relief pattern 20, between third and fourth optical element components 11, 12.
    Type: Application
    Filed: February 8, 2006
    Publication date: February 26, 2009
    Inventors: Kenzaburo Suzuki, Akiko Miyakawa
  • Publication number: 20080180804
    Abstract: A projector optical system for forming a real image by projecting an image of a display element has, sequentially from a screen side or an observation side, a first lens group having positive refractive power, an aperture diaphragm, a second lens group, and a third lens group having positive refractive power, with a diffractive optical element being provided on at least one of the first lens group and the second lens group which are adjacent to the aperture diaphragm. The projector optical system satisfies: 0.05<G/L<0.9 wherein G is an air gap on the optical axis between the second lens group and the third lens group, and L is a length on the optical axis, from the surface that is closest to the screen side to the display element.
    Type: Application
    Filed: January 4, 2008
    Publication date: July 31, 2008
    Inventor: Kenzaburo SUZUKI
  • Publication number: 20080019001
    Abstract: A projector optical system for forming a real image by projecting an image of a display element is constituted by, sequentially from a projection side, an aperture diaphragm; and a first lens group having positive refractive power and having, in the interior thereof or on a lens surface at a projection side or at a display element side, a diffraction optical surface formed by a multilayer-type diffractive optical element in which diffraction gratings formed on two diffractive element components are arranged facing each other. The projector optical system is configured so as to satisfy the following expression 0.1<K/L<1.5 wherein L is a total length on an optical axis, and K is a distance on the optical axis from the aperture diaphragm to a surface of the first lens group that is closest to the projection side, and satisfy also the following expression 0.01<?Nd<0.45 wherein ?Nd is a difference between refractive indices of the two diffractive element components for a main wavelength (d-line).
    Type: Application
    Filed: July 16, 2007
    Publication date: January 24, 2008
    Inventor: Kenzaburo SUZUKI
  • Patent number: 7136226
    Abstract: A front teleconverter lens system having superb optical performance with less production of aberration in spite of its compactness. The front teleconverter lens system includes, in order from an object, a first lens group having positive refractive power, and a second lens group having negative refractive power, and forming an afocal optical system. A diffractive optical surface is arranged in at least one of the first lens group and the second lens group. The conditional expression 1.2<?F/?R<10 is satisfied, where ?F denotes the effective diameter of the most object side lens surface of the first lens group, and ?R denotes the effective diameter of the most image side lens surface of the second lens group.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: November 14, 2006
    Assignee: Nikon Corporation
    Inventor: Kenzaburo Suzuki
  • Patent number: 7123422
    Abstract: To provide a zoom lens system having high optical performance by using a diffractive optical element, the system includes a first group having positive power, a second group having negative power, and a third group having positive power. When zooming from a wide-angle end state to a telephoto end state, a distance between the first group and the second group and a distance between the second group and the third group vary. The third group is composed of a front group having positive power locating to the object side of the largest space in the third group and a rear group having negative power locating to an image side of the space. The front group includes an aperture stop and a diffractive optical surface. An incident angle of a principal ray reaching the maximum image height to the diffractive optical surface is ten degrees or less. Given condition is satisfied.
    Type: Grant
    Filed: September 28, 2004
    Date of Patent: October 17, 2006
    Assignee: Nikon Corporation
    Inventor: Kenzaburo Suzuki
  • Publication number: 20060171031
    Abstract: The present invention is a diffractive optical element 1 in which mutually different materials make contact with one another via the same diffraction grating groove 30. One of the mutually different materials is a first ultraviolet curing resin 10 and the other of the mutually different materials is a second ultraviolet curing resin 20 that is different from the first ultraviolet curing resin 10.
    Type: Application
    Filed: March 28, 2006
    Publication date: August 3, 2006
    Inventor: Kenzaburo Suzuki
  • Patent number: 7075734
    Abstract: A zoom lens system having an exit pupil far away from the image plane, zoom ratio of about three, and in particular having compactness and high optical performance includes, in order from an object, a first lens group having negative refractive power, an aperture stop, a second lens group having positive refractive power, and a third lens group having positive refractive power. When zooming from a wide-angle end state to a telephoto end state, the first and second lens groups are moved and the third lens group is fixed such that a distance between the first lens group and the second lens group varies, and a distance between the second lens group and the third lens group increases. The second lens group is composed of four lenses or less and includes a diffractive optical surface formed on a lens surface except the most object side lens surface.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: July 11, 2006
    Assignee: Nikon Corporation
    Inventor: Kenzaburo Suzuki
  • Patent number: 7042642
    Abstract: A diffractive optical element includes a first diffractive element and a second diffractive element that is made of a material different from that of the first diffractive element and is cemented with the first diffractive element, forming a diffraction grating at the cemented surface. A shade film is formed on a wall surface of each groove of the diffraction grating to enhance the angular characteristic of the grating.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: May 9, 2006
    Assignee: Nikon Corporation
    Inventors: Yoshifumi Tokoyoda, Kenzaburo Suzuki
  • Publication number: 20050207023
    Abstract: A zoom lens system having an exit pupil far away from the image plane, zoom ratio of about three, and in particular having compactness and high optical performance includes, in order from an object, a first lens group having negative refractive power, an aperture stop, a second lens group having positive refractive power, and a third lens group having positive refractive power. When zooming from a wide-angle end state to a telephoto end state, the first and second lens groups are moved and the third lens group is fixed such that a distance between the first lens group and the second lens group varies, and a distance between the second lens group and the third lens group increases. The second lens group is composed of four lenses or less and includes a diffractive optical surface formed on a lens surface except the most object side lens surface.
    Type: Application
    Filed: May 13, 2005
    Publication date: September 22, 2005
    Inventor: Kenzaburo Suzuki
  • Patent number: 6909846
    Abstract: A zoom lens system having an exit pupil far away from the image plane, zoom ratio of about three, and in particular having compactness and high optical performance includes, in order from an object, a first lens group having negative refractive power, an aperture stop, a second lens group having positive refractive power, and a third lens group having positive refractive power. When zooming from a wide-angle end state to a telephoto end state, the first and second lens groups are moved and the third lens group is fixed such that a distance between the first lens group and the second lens group varies, and a distance between the second lens group and the third lens group increases. The second lens group is composed of four lenses or less and includes a diffractive optical surface formed on a lens surface except the most object side lens surface.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: June 21, 2005
    Assignee: Nikon Corporation
    Inventor: Kenzaburo Suzuki
  • Publication number: 20050068637
    Abstract: To provide a zoom lens system having high optical performance by using a diffractive optical element, the system includes a first group having positive power, a second group having negative power, and a third group having positive power. When zooming from a wide-angle end state to a telephoto end state, a distance between the first group and the second group and a distance between the second group and the third group vary. The third group is composed of a front group having positive power locating to the object side of the largest space in the third group and a rear group having negative power locating to an image side of the space. The front group includes an aperture stop and a diffractive optical surface. An incident angle of a principal ray reaching the maximum image height to the diffractive optical surface is ten degrees or less. Given condition is satisfied.
    Type: Application
    Filed: September 28, 2004
    Publication date: March 31, 2005
    Inventor: Kenzaburo Suzuki
  • Publication number: 20050018293
    Abstract: The present invention provides a front teleconverter lens system having superb optical performance with less production of aberration in spite of its compactness. The front teleconverter lens system includes, in order from an object, a first lens group FL having positive refractive power, and a second lens group RL having negative refractive power, and forming an afocal optical system. A diffractive optical surface Gf is arranged in at least one of the first lens group FL and the second lens group RL. The following conditional expression 1.2<?F/?R<10 is satisfied, where ?F denotes the effective diameter of the most object side lens surface L101 of the first lens group FL, and ?R denotes the effective diameter of the most image side lens surface L105 of the second lens group RL.
    Type: Application
    Filed: December 23, 2003
    Publication date: January 27, 2005
    Inventor: Kenzaburo Suzuki
  • Publication number: 20050018299
    Abstract: The object is providing a multi-layer type diffractive optical element enhancing angular characteristic. A diffractive optical element includes a first diffractive element 6 and a second diffractive element 7 that is made of a material different from the first diffractive element 6 and is cemented with the first diffractive element 6 forming a diffraction grating 1 at the cemented surface. A shade film 5a is formed on a wall surface 3 of the groove of the diffraction grating 1.
    Type: Application
    Filed: September 30, 2003
    Publication date: January 27, 2005
    Inventors: Yoshifumi Tokoyoda, Kenzaburo Suzuki
  • Publication number: 20040136705
    Abstract: A zoom lens system having an exit pupil far away from the image plane, zoom ratio of about three, and in particular having compactness and high optical performance includes, in order from an object, a first lens group having negative refractive power, an aperture stop, a second lens group having positive refractive power, and a third lens group having positive refractive power. When zooming from a wide-angle end state to a telephoto end state, the first and second lens groups are moved and the third lens group is fixed such that a distance between the first lens group and the second lens group varies, and a distance between the second lens group and the third lens group increases. The second lens group is composed of four lenses or less and includes a diffractive optical surface formed on a lens surface except the most object side lens surface.
    Type: Application
    Filed: December 23, 2003
    Publication date: July 15, 2004
    Applicant: Nikon Corporation
    Inventor: Kenzaburo Suzuki
  • Patent number: 6665131
    Abstract: An imaging optical system having superior optical performance with the improved correction of chromatic aberration over a wide wavelength range extending from the visible wavelength range to the infrared wavelength range is provided. According to one aspect, an imaging optical system includes, in order from an object, a front lens group GF with a positive refractive power having at least one lens element, an aperture stop SP and a rear lens group GR with a positive refractive power having at least one lens element. The front lens group GF includes a double convex positive lens GT arranged to the most object side. At least one of the front lens group GF and the rear lens group GR includes a triple cemented lens GS being adjacent to the aperture stop SP having a negative refractive power as a whole composed of a first positive lens, a negative lens, and a second positive lens. Predetermined conditional expression is satisfied.
    Type: Grant
    Filed: August 29, 2001
    Date of Patent: December 16, 2003
    Assignee: Nikon Corporation
    Inventors: Kenzaburo Suzuki, Hidenobu Harada
  • Patent number: 6563644
    Abstract: To provide a front tele-converter that may cause less aberrations and has a superior imaging quality though it has a high magnification, disclosed is a front tele-converter TC having an afocal magnification higher than 1.9, which is detachably mountable to a photo-taking lens L on its object side. The front tele-converter has, in order from the object side, a positive lens group GF having a positive refractive power and a negative lens group GR having a negative refractive power. The positive lens group GF has a positive cemented lens, the negative lens group GR has a positive lens with its convex surface facing the image side, a vibration-reduction lens group GV comprising a lens group consisting of part or the whole of the negative lens group GR and having a negative refractive power is movable in a direction disposed at substantially right angles with the optical axis to effect vibration reduction, and the lens groups fulfill a specific condition.
    Type: Grant
    Filed: April 5, 2002
    Date of Patent: May 13, 2003
    Assignee: Nikon Corporation
    Inventor: Kenzaburo Suzuki
  • Publication number: 20030021031
    Abstract: To provide a front tele-converter that may cause less aberrations and has a superior imaging quality though it has a high magnification, disclosed is a front tele-converter TC having an afocal magnification higher than 1.9, which is detachably mountable to a photo-taking lens L on its object side. The front tele-converter has, in order from the object side, a positive lens group GF having a positive refractive power and a negative lens group GR having a negative refractive power. The positive lens group GF has a positive cemented lens, the negative lens group GR has a positive lens with its convex surface facing the image side, a vibration-reduction lens group GV comprising a lens group consisting of part or the whole of the negative lens group GR and having a negative refractive power is movable in a direction disposed at substantially right angles with the optical axis to effect vibration reduction, and the lens groups fulfill a specific condition.
    Type: Application
    Filed: April 5, 2002
    Publication date: January 30, 2003
    Applicant: Nikon Corporation
    Inventor: Kenzaburo Suzuki
  • Patent number: 6424465
    Abstract: To provide a front tele-converter that may cause less aberrations and has a superior imaging quality though it has a high magnification, disclosed is a front tele-converter TC having an afocal magnification higher than 1.9, which is detachably mountable to a photo-taking lens L on its object side. The front tele-converter has, in order from the object side, a positive lens group GF having a positive refractive power and a negative lens group GR having a negative refractive power. The positive lens group GF has a positive cemented lens, the negative lens group GR has a positive lens with its convex surface facing the image side, and the lens groups fulfill a specific condition.
    Type: Grant
    Filed: December 14, 2000
    Date of Patent: July 23, 2002
    Assignee: Nikon Corporation
    Inventor: Kenzaburo Suzuki