Patents by Inventor Junji Kamikubo

Junji Kamikubo 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: 7075691
    Abstract: A complex lens for a tandem scanning optical system converges a plurality of light beams, which are modulated independently and deflected by a deflector, onto a surface to be scanned, and forms a plurality of scanning lines at the same time. The complex lens includes a plurality of stacked lens portions that are molded as a single-piece element. Thus a plurality of lens surfaces of the lens portions at an incident side are formed by a single-piece mirror surface core and a plurality of lens surfaces of the lens portions at an exit side are formed by another single-piece mirror surface core during the molding process.
    Type: Grant
    Filed: August 24, 2004
    Date of Patent: July 11, 2006
    Assignee: PENTAX Corporation
    Inventors: Daisuke Koreeda, Junji Kamikubo
  • Patent number: 6906824
    Abstract: A tandem type printer is provided with a plurality of scanning optical systems, a plurality of f? lenses and photoconductive drums, which correspond to the scanning optical systems, respectively. Each scanning optical system includes a laser source and a deflector that deflects the laser beam emitted by the laser source to scan, in a main scanning direction, within a predetermined angular range. The deflected laser beam is converged by the f? lens on the corresponding photoconductive drum and form an image. Images formed on the plurality of photoconductive drums are developed and transferred on a sheet in an overlaid fashion. Each f? lens includes a glass lens that is burdened with substantially all the power, in the main scanning direction, of the f? lens, and a plastic lens that is burdened with compensation for aberrations of the f? lens. Further, a diffraction lens structure is formed to compensate for a lateral chromatic aberration of the f? lens in the main scanning direction.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: June 14, 2005
    Assignee: PENTAX Corporation
    Inventors: Junji Kamikubo, Daisuke Koreeda
  • Publication number: 20050024723
    Abstract: A complex lens for a tandem scanning optical system converges a plurality of light beams, which are modulated independently and deflected by a deflector, onto a surface to be scanned, and forms a plurality of scanning lines at the same time. The complex lens includes a plurality of stacked lens portions that are molded as a single-piece element. Thus a plurality of lens surfaces of the lens portions at an incident side are formed by a single-piece mirror surface core and a plurality of lens surfaces of the lens portions at an exit side are formed by another single-piece mirror surface core during the molding process.
    Type: Application
    Filed: August 24, 2004
    Publication date: February 3, 2005
    Applicant: PENTAX Corporation
    Inventors: Daisuke Koreeda, Junji Kamikubo
  • Patent number: 6790389
    Abstract: Disclosed is a manufacturing method of a complex lens for a tandem scanning optical system that includes a step for preparing molding dies for forming a cavity to form the complex lens as a single-piece element, and a step for injecting lens material into the cavity. The molding dies include a pair of single-piece mirror surface cores that form a plurality of lens surfaces of the complex lens at an incident side and a plurality of lens surfaces at an exit side, respectively. The complex lens has a plurality of stacked lens portions and the lens portions converging a plurality of light beams, which are modulated independently and deflected by a deflector, onto a surface to be scanned, respectively, for forming a plurality of scanning lines at the same time.
    Type: Grant
    Filed: November 16, 2001
    Date of Patent: September 14, 2004
    Assignee: PENTAX Corporation
    Inventors: Daisuke Koreeda, Junji Kamikubo
  • Patent number: 6560034
    Abstract: A beam shaping optical system which is provided with a first wedge prism having two refractive surfaces defining a first principal section, and a second wedge prism having two refractive surfaces defining a second principal section that is parallel to the first principal section, wherein a reference ray of light forms incident angles at each of the refractive surfaces of the prisms satisfying the following condition (1): &LeftBracketingBar; ∑ j = 1 L ⁢ α j &RightBracketingBar; < 0.020 .
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: May 6, 2003
    Assignee: PENTAX Corporation
    Inventors: Koichi Maruyama, Junji Kamikubo
  • Publication number: 20020097475
    Abstract: Disclosed is a manufacturing method of a complex lens for a tandem scanning optical system that includes a step for preparing molding dies for forming a cavity to form the complex lens as a single-piece element, and a step for injecting lens material into the cavity. The molding dies include a pair of single-piece mirror surface cores that form a plurality of lens surfaces of the complex lens at an incident side and a plurality of lens surfaces at an exit side, respectively. The complex lens has a plurality of stacked lens portions and the lens portions converging a plurality of light beams, which are modulated independently and deflected by a deflector, onto a surface to be scanned, respectively, for forming a plurality of scanning lines at the same time.
    Type: Application
    Filed: November 16, 2001
    Publication date: July 25, 2002
    Applicant: ASAHI KOGAKU KOGYO KABUSHIKI KAISHA
    Inventors: Daisuke Koreeda, Junji Kamikubo
  • Patent number: 6342964
    Abstract: A scanning optical system includes a semiconductor laser, a polygonal mirror, which deflects a beam emitted from the semiconductor laser, an f&thgr; lens for converging the deflected beam onto an object surface, and a diffractive element located between the polygonal mirror and the f&thgr; lens. The diffractive element corrects a lateral chromatic aberration caused by the f&thgr; lens. The diffractive element is inclined such that the light source side edge of thereof is close to the polygon mirror and the other side edge is apart form the polygon mirror relative to the reference condition where the normal of the diffractive element is parallel to the optical axis of the f&thgr; lens. Further, the diffractive element is arranged such that a reference point, which is the center of the rotationally symmetrical diffractive surface, deviates from the optical axis of the f&thgr; lens in the direction away from the semiconductor laser.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: January 29, 2002
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Junji Kamikubo
  • Publication number: 20010046092
    Abstract: A beam shaping optical system which is provided with a first wedge prism having two refractive surfaces defining a first principal section, and a second wedge prism having two refractive surfaces defining a second principal section that is parallel to the first principal section, wherein a reference ray of light forms incident angles at each of the refractive surfaces of the prisms satisfying the following condition (1): 1 &LeftBracketingBar; ∑ j = 1 L ⁢ α j &RightBracketingBar; < 0.020 .
    Type: Application
    Filed: June 22, 2001
    Publication date: November 29, 2001
    Applicant: ASAHI KOGAKU KOGYO KABUSHIKI KAISHA
    Inventors: Koichi Maruyama, Junji Kamikubo
  • Patent number: 6282031
    Abstract: A beam shaping optical system which is provided with a first wedge prism having two refractive surfaces defining a first principal section, and a second wedge prism having two refractive surfaces defining a second principal section that is parallel to the first principal section, wherein a reference ray of light forms incident angles at each of the refractive surfaces of the prisms satisfying the following condition (1): &LeftBracketingBar; ∑ j = 1 L ⁢   ⁢ α j &RightBracketingBar; < 0.020 .
    Type: Grant
    Filed: July 27, 1999
    Date of Patent: August 28, 2001
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Koichi Maruyama, Junji Kamikubo
  • Patent number: 6275318
    Abstract: A linear imaging lens element for a scanning optical system in which light flux from a light source is formed as a linear image in the vicinity of a reflection surface of a light deflector includes a progressive power toric-aspherical surface being provided on either a surface facing the light source or on a surface facing the deflector. Cross-sectional configurations of the progressive power toric-aspherical surface, which are parallel with the plane including the optical axis and being perpendicular to the linear image, are made to be a circular arc, and the radius of curvature of each circular arc cross-sectional configuration is independently determined from the cross-sectional configuration lain on the plane which includes the optical axis and is parallel with the linear image.
    Type: Grant
    Filed: June 24, 1999
    Date of Patent: August 14, 2001
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Junji Kamikubo, Daisuke Koreeda
  • Publication number: 20010009470
    Abstract: A scanning optical system includes a semiconductor laser, a polygonal mirror, which deflects a beam emitted from the semiconductor laser, an f&thgr; lens for converging the deflected beam onto an object surface, and a diffractive element located between the polygonal mirror and the f&thgr; lens. The diffractive element corrects a lateral chromatic aberration caused by the f&thgr; lens. The diffractive element is inclined such that the light source side edge of thereof is close to the polygon mirror and the other side edge is apart from the polygon mirror relative to the reference condition where the normal of the diffractive element is parallel to the optical axis of the f&thgr; lens. Further, the diffractive element is arranged such that a reference point, which is the center of the rotationally symmetrical diffractive surface, deviates from the optical axis of the f&thgr; lens in the direction away from the semiconductor laser.
    Type: Application
    Filed: January 12, 2001
    Publication date: July 26, 2001
    Applicant: ASAHI KOGAKU KOGYO KABUSHIKI KAISHA
    Inventor: Junji Kamikubo
  • Patent number: 6259547
    Abstract: Disclosed is a scanning optical system, which is provided with a light source, a deflector, which deflects a beam emitted from said light source, and a scanning lens for converging the beam deflected by said deflector onto a surface to be scanned. The scanning lens has a positive power as a whole, and includes a plurality of refraction lens elements. Further, a diffraction lens structure is formed on at least one surface of one of the plurality of lens elements. Combination of the refraction lens elements and the diffraction lens structure compensates a lateral chromatic aberration caused by the refraction lens elements.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: July 10, 2001
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Junji Kamikubo
  • Patent number: 6222661
    Abstract: A scanning optical system is provided with a semiconductor laser, a polygonal mirror, which deflects a beam emitted from the semiconductor laser, an f&thgr; lens for converging the beam deflected by the deflector onto a surface to be scanned, and a diffractive surface between the polygonal mirror and the surface to be scanned. The diffractive surface compensates for a lateral chromatic aberration caused by the f&thgr; lens. Further, the diffraction efficiency of the diffractive surface on an optical axis of the f&thgr; lens is smaller than that of a peripheral portion to cancel a power variation due to a variation of the light quantity transmitted through the scanning lens.
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: April 24, 2001
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Shuichi Takeuchi, Junji Kamikubo
  • Patent number: 6212022
    Abstract: Disclosed is a multi-beam optical system, which has a light source having a plurality of light emitting portions from which a plurality of light beams are emitted, respectively; a collimating lens which collimates the plurality of light beams into a plurality of parallel light beams; a beam shaping optical system including at least one wedge prism, the beam shaping optical system shaping cross section of the plurality of parallel beams; an image forming optical system which converges the plurality of parallel beams transmitted through the beam shaping optical system. In such a multi-beam optical system, a plurality of light emitting portions are aligned in a direction perpendicular to a principal section of the wedge prism.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: April 3, 2001
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Junji Kamikubo
  • Patent number: 6201626
    Abstract: A scanning optical system is provided with a light source, a deflector, which deflects a beam emitted from said light source, and a scanning lens for converging the beam deflected by the deflector onto a surface to be scanned. The scanning lens has a positive power as a whole, and includes a diffraction lens structure that is formed on at least one surface of one of the lens element. The diffractive lens structure compensates a lateral chromatic aberration caused by the refraction lens elements. The diffraction lens structure satisfies the following condition (1); 0.3≦m/W≦4.0  (1) where, m is the number of periodic patterns of the diffraction lens structure struck by the incident light beam having the maximum scan angle W (unit: degrees).
    Type: Grant
    Filed: June 23, 1999
    Date of Patent: March 13, 2001
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Junji Kamikubo
  • Patent number: 6185027
    Abstract: A monitoring optical system of the present invention is used in a scanning optical device in which a deflected laser beam by a polygonal mirror is separated from an incident laser beam in an auxiliary scanning direction, and the deflected laser beam is converged onto a drawing surface through a curved surface mirror and a drawing anamorphic lens, which corrects an effect of skew of the laser beam. The monitoring optical system includes a monitoring cylindrical lens for converging a monitor beam separated from the deflected laser beam without passing the drawing anamorphic lens, and a monitoring sensor for detecting the monitor beam converged by the monitoring cylindrical lens to generate synchronizing signal. A main meridian that indicates a main refractive power of the monitoring cylindrical lens is inclined with respect to a z-direction on a plan perpendicular to the monitor beam so that wavefront aberration on the monitoring sensor is minimized.
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: February 6, 2001
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Junji Kamikubo
  • Patent number: 6178029
    Abstract: A multi-beam scanning optical device, includes a plurality of light sources, a scanning optical system that scans a scanned surface with the beams emitted from the light sources, a beam detecting sensor that detects scanning timings of respective scanning beams at upstream of a drawing area, a controller that modulates the respective beams from the light sources, and a compensation optical element that has dispersion to vary a deviation angle according to a wavelength of light. The controller starts to modulate each of the beams per scan after predetermined time interval when the beam detecting sensor detects the scanning timing. The compensation optical element is located on an optical path of the scanning beams to adjust incident timings of the scanning beams onto the beam detecting sensor.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: January 23, 2001
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Junji Kamikubo
  • Patent number: 6128119
    Abstract: Disclosed is a multi-beam optical system, which has a light source having a plurality of light emitting portions from which a plurality of light beams are emitted, respectively; a collimating lens which collimates the plurality of light beams into a plurality of parallel light beams; a beam shaping optical system including at least one wedge prism, the beam shaping optical system shaping cross section of the plurality of parallel beams; an image forming optical system which converges the plurality of parallel beams transmitted through the beam shaping optical system. In such a multi-beam optical system, a plurality of light emitting portions are aligned in a direction perpendicular to a principal section of the wedge prism.
    Type: Grant
    Filed: January 9, 1998
    Date of Patent: October 3, 2000
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Junji Kamikubo
  • Patent number: 6124962
    Abstract: Disclosed is a scanning optical system, which is provided with a light source, a deflector, which deflects a beam emitted from said light source, and a scanning lens for converging the beam deflected by said deflector onto a surface to be scanned. The scanning lens has a positive power as a whole, and includes a plurality of refraction lens elements. Further, a diffraction lens structure is formed on at least one surface of one of the plurality of lens elements. Combination of the refraction lens elements and the diffraction lens structure compensates a lateral chromatic aberration caused by the refraction lens elements.
    Type: Grant
    Filed: December 24, 1997
    Date of Patent: September 26, 2000
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Junji Kamikubo
  • Patent number: 6115164
    Abstract: Disclosed is a scanning optical system including a light source that emits a light beam, a deflector that deflects a light beam emitted from the light source to scan in a predetermined direction, an scanning lens system that allows the light beam deflected by the deflector to pass through and converges the light beam on a surface to be scanned, and a diffracting element having a diffracting surface that functions to correct a chromatic aberration of the scanning lens. The diffracting element is arranged between the deflector and the surface to be scanned.
    Type: Grant
    Filed: July 21, 1998
    Date of Patent: September 5, 2000
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Junji Kamikubo