Patents by Inventor Shigeo Kayashima
Shigeo Kayashima 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: 6115012Abstract: An optical deflection apparatus includes a pair of transparent electrodes, a liquid crystal layer, put between the transparent electrodes, in which stripes are formed at intervals based on a waveform of a driving signal supplied to the pair of transparent electrodes, the stripes functioning as a grating by which incident light is deflected in a deflecting direction, and a driving unit for supplying to the pair of transparent electrodes the driving signal having a waveform by which the deflecting direction changes with time.Type: GrantFiled: December 6, 1995Date of Patent: September 5, 2000Assignee: Fujitsu LimitedInventors: Shin Eguchi, Yoshihiro Mizuno, Shigeo Kayashima, Manabu Ishimoto, Masato Nakashima
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Patent number: 6091544Abstract: A high-resolution light-beam scanning apparatus utilizing only mass-producible holograms instead of utilizing auxiliary optical systems such as optical lenses or a mirror having curvature, and capable of compensating for disadvantages including scanning beam thickening and variation, failure of a rotatable hologram to rotate at a constant velocity, displacement of a scanning beam position in the scanning direction and the cross scanning direction due to a mode hop of a wavelength of a semiconductor laser, and deviation of a base of rotatable hologram from a parallel state. These disadvantages are detrimental to efforts for increasing the resolution of a hologram scanner and lowering the cost thereof.Type: GrantFiled: April 23, 1997Date of Patent: July 18, 2000Assignee: Fujitsu LimitedInventors: Shinya Hasegawa, Shigeo Kayashima, Satoshi Maeda, Hirokazu Aritake
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Patent number: 6040929Abstract: A high-resolution light-beam scanning apparatus utilizing only mass-producible holograms instead of utilizing auxiliary optical systems such as optical lenses or a mirror having curvature, and capable of compensating for disadvantages including scanning beam thickening and variation, failure of a rotatable hologram to rotate at a constant velocity, displacement of a scanning beam position in the scanning direction and the cross scanning direction due to a mode hop of a wavelength of a semiconductor laser, and deviation of a base of rotatable hologram from a parallel state. These disadvantages are detrimental to efforts for increasing the resolution of a hologram scanner and lowering the cost thereof. The light beam scanning apparatus includes at least two holograms, one rotatable and one fixed, wherein the fixed hologram plate has a phase distribution .PHI..sub.H represented as a difference obtained when subtracting a reference wave phase .PHI..sub.0 from an object wave phase .PHI..sub.Type: GrantFiled: April 23, 1997Date of Patent: March 21, 2000Assignee: Fujitsu LimitedInventors: Shinya Hasegawa, Shigeo Kayashima, Satoshi Maeda, Hirokazu Aritake
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Patent number: 6020999Abstract: A high-resolution light-beam scanning apparatus utilizing only mass-producable holograms instead of utilizing auxiliary optical systems such as optical lenses or a mirror having curvature. The light beam scanning apparatus is capable of compensating for disadvantages including scanning beam thickening and variation, failure of a rotatable hologram to rotate at a constant velocity, displacement of a scanning beam position in the scanning direction and the cross scanning direction due to a mode hop of a wavelength of a semiconductor laser, and deviation of a base of a rotatable hologram from a parallel state, which disadvantages are detrimental to efforts for increasing the resolution of a hologram scanner and lowering the cost thereof. The light beam scanning apparatus incudes at least two holograms with an optical path length difference .DELTA..PHI.<(.lambda..sup.2 /D.lambda.) where < is a constant less than 0.5. The path length is related per the above equation to a wavelength, .lambda.Type: GrantFiled: April 23, 1997Date of Patent: February 1, 2000Assignee: Fujitsu LimitedInventors: Shinya Hasegawa, Shigeo Kayashima, Satoshi Maeda, Hirokazu Aritake
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Patent number: 6020984Abstract: A high-resolution light-beam scanning apparatus utilizing only mass-producible holograms instead of utilizing auxiliary optical systems such as an optical lens or a mirror having curvature, and capable of compensating for disadvantages including scanning beam thickening and variation, failure of a rotatable hologram to rotate at a constant velocity, displacement of a scanning beam position in the scanning direction and the cross scanning direction due to a mode hop of a wavelength of a semiconductor laser, and deviation of a base of a rotatable hologram from a parallel state, which disadvantages are detrimental to efforts for increasing the resolution of a hologram scanner and lowering the cost thereof, the light-beam scanning apparatus being characterized in that provided in the rotatable hologram (1) and the fixed plate (2) arediffraction gratings for minimizing:either a sum total of values obtained by weighting:a square of an optical path length difference between a) an optical path of a light flux measureType: GrantFiled: April 23, 1997Date of Patent: February 1, 2000Assignee: Fujitsu Ltd.Inventors: Shinya Hasegawa, Shigeo Kayashima, Satoshi Maeda, Hirokazu Aritake
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Patent number: 5995250Abstract: A method of manufacturing a fixed hologram plate of a light-beam scanning apparatus for diffracting a light incident from a light source portion by a rotatable hologram, scanning by the diffracted light through the rotation of the rotatable hologram, diffracting the resulting light by the fixed hologram plate, and for conducting a light-beam scanning on a scanning surface. The method includes the steps of preparing an interference fringe distribution of the fixed hologram plate by two waves: a first wave having a spherical aberration, a transverse aberration of the first wave is in the Y direction, the transverse wave including an astigmatism and a coma; and a second wave having a spherical aberration and astigmatism, and having a wavelength different from a wavelength of a reconstructing wave that is selected to minimize distortion, wherein a transverse aberration of the second wave is in the X direction.Type: GrantFiled: April 23, 1997Date of Patent: November 30, 1999Assignee: Fujitsu LimitedInventors: Shinya Hasegawa, Shigeo Kayashima, Satoshi Maeda, Hirokazu Aritake
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Patent number: 5978111Abstract: A high-resolution light-beam scanning apparatus utilizing only mass-producible holograms instead of utilizing auxiliary optical systems, and capable of compensating for disadvantages.Type: GrantFiled: May 30, 1995Date of Patent: November 2, 1999Assignee: Fujitsu LimitedInventors: Shinya Hasegawa, Shigeo Kayashima, Satoshi Maeda, Fumio Yamagishi, Hirokazu Aritake
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Patent number: 5973837Abstract: A light-beam scanning apparatus including a rotatable hologram and a fixed plate, which are provided with diffraction gratings to minimize: either a sum total of values obtained by weighting where a square of an optical path length difference between an optical path of a light flux measured along a principal axis of a light beam incident on and diffracted by a diffraction grating of a rotatable hologram, and incident on and diffracted by a diffraction grating of a fixed plate so as to conduct a scanning and converging on a scanning point on an image formation surface, and an optical path of a light flux measured along a marginal ray distanced from the principal axis; or an absolute value of the optical path difference thereof.Type: GrantFiled: April 23, 1997Date of Patent: October 26, 1999Assignee: Fujitsu LimitedInventors: Shinya Hasegawa, Shigeo Kayashima, Satoshi Maeda, Hirokazu Aritake
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Patent number: 5900955Abstract: An optical scanning system includes a laser source, a deflector deflecting a laser beam emitted from the laser source, and at least two hologram elements located between the deflector and an image forming member.Type: GrantFiled: May 22, 1997Date of Patent: May 4, 1999Assignee: Fujitsu LimitedInventors: Hiroyasu Yoshikawa, Shinya Hasegawa, Satoshi Maeda, Shigeo Kayashima, Fumio Yamagishi
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Patent number: 5892597Abstract: A holographic recording apparatus includes first and second light sources for respectively generating first and second light beams. A mask is located in front of a hologram recording material and has an aperture. Interference fringes are recorded in a hologram cell on the hologram recording material corresponding to the aperture. A movement mechanism supports the hologram recording material masked by the mask and relatively moves the hologram recording material with respect to the mask in predetermined directions so that an interference pattern is formed in an area on the hologram recording material. A spatial frequency changing mechanism changes incident angles of the first and second light beams with respect to the mask.Type: GrantFiled: June 17, 1997Date of Patent: April 6, 1999Assignee: Fujitsu LimitedInventors: Shigetake Iwata, Satoshi Maeda, Shigeo Kayashima, Shinya Hasegawa
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Patent number: 5861989Abstract: A high-resolution light-beam scanning apparatus including a rotatable hologram and a fixed plate which are diffraction gratings for minimizing either a sum total of values obtained by weighting (1): a square of an optical path length difference between a) an optical path of a light flux measured along a principal axis of a light beam incident on and diffracted by a first diffraction grating of the rotatable hologram, and incident on and diffracted by a second diffraction grating of the fixed plate so as to conduct a scanning and converging on an image formation surface scanning point, and b) an optical path of a light flux measured along a marginal ray distanced from the principal axis, or an absolute value of the optical path difference thereof; or (2) a square of a sum obtained by adding an amount of displacement of a light beam convergent on the scanning point, which displacement is measured along the marginal ray distanced from the principal axis of an incident reconstructing light flux with respect to thType: GrantFiled: April 25, 1997Date of Patent: January 19, 1999Assignee: Fujitsu LimitedInventors: Shinya Hasegawa, Shigeo Kayashima, Satoshi Maeda, Shigetake Iwata, Fumio Yamagishi, Masato Nakashima, Hirokazu Aritake, Mamoru Hokari
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Patent number: 5861964Abstract: A high-resolution light-beam scanning apparatus utilizing only mass-producible holograms instead of utilizing auxiliary optical systems, and capable of compensating for disadvantages.Type: GrantFiled: May 30, 1995Date of Patent: January 19, 1999Assignee: Fujitsu LimitedInventors: Shinya Hasegawa, Shigeo Kayashima, Satoshi Maeda, Shigetake Iwata, Fumio Yamagishi, Masato Nakashima, Hirokazu Aritake, Mamoru Hokari
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Patent number: 5831711Abstract: An optical deflector device includes a VGM cell including a film of a nematic liquid crystal material which generates a distribution of spatial frequencies when subjected to an electric field. A film thickness setting unit sets a thickness distribution of the film in the VGM cell in accordance with a film thickness distribution defined by a predetermined function.Type: GrantFiled: November 7, 1995Date of Patent: November 3, 1998Assignee: Fujitsu LimitedInventors: Shigeo Kayashima, Shin Eguchi, Takahiro Matsuda, Manabu Ishimoto, Yoshihiro Mizuno
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Patent number: 5680253Abstract: A high-resolution light-beam scanning apparatus utilizing only mass-producible holograms instead of utilizing auxiliary optical systems, and capable of compensating for disadvantages.Type: GrantFiled: November 25, 1992Date of Patent: October 21, 1997Assignee: Fujitsu LimitedInventors: Shinya Hasegawa, Shigeo Kayashima, Satoshi Maeda, Shigetake Iwata, Fumio Yamagishi, Masato Nakashima, Hirokazu Aritake, Mamoru Hokari
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Patent number: 5550655Abstract: A laser beam passes through two holograms or through a hologram twice to reduce the ratio .lambda./d so that P-polarized light, as well as S-polarized light, can be diffracted with high diffraction efficiency and uses a hologram or holograms formed on a base plate and facilitates the separation of a stamper from the base plate in producing replicas of the hologram. A laser beam (5) passes through two holograms formed on a transparent base plate or through a hologram formed on a transparent base plate twice. The ratio .lambda./d, where .lambda. is the wavelength of the laser beam and d is the grating constant of the hologram, is in the range of 0.4 to 1.1.Type: GrantFiled: April 22, 1994Date of Patent: August 27, 1996Assignee: Fujitsu LimitedInventors: Shigeo Kayashima, Shinya Hasegawa, Satoshi Maeda, Hirokazu Aritake
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Patent number: 5361149Abstract: An optimized design method of a holographic optical element by calculating a correction coefficient so that an evaluating amount of a reconstructed light reconstructed by the holographic optical element can be minimized, the correction coefficient determining an aspheric term included in a phase transfer function, the phase transfer function representing a shape of an interference fringe recorded on the holographic optical element. According to the method, the wavefront aberration is expressed via a linear function of the correction coefficient by positioning a main axis point on a characteristic evaluating surface onto which the reconstructed light is projected, so that a wavefront aberration of the reconstructed light can be minimized. Then, the correction coefficient is calculated based on the linear function so that the evaluating amount can minimized.Type: GrantFiled: March 19, 1992Date of Patent: November 1, 1994Assignee: Fujitsu LimitedInventors: Shinya Hasegawa, Shigeo Kayashima
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Patent number: 5295004Abstract: An optical beam scanning apparatus includes one rotatable hologram which is rotatable about an axis, and at least two laser beam sources which emit laser beams. The rotatable hologram is provided with at least two hologram areas whose number corresponds to the number of the laser beam sources, so that the laser beams emitted from the respective laser beam sources are made incident upon the respective hologram areas. Each of the hologram areas is provided with a plurality of hologram facets which are concentrically arranged with respect to the axis of rotation of the rotatable hologram to emit laser beams of the same F number. The hologram areas having different numbers of hologram facets having different F numbers.Type: GrantFiled: November 6, 1992Date of Patent: March 15, 1994Assignee: Fujitsu LimitedInventors: Shinya Hasegawa, Fumio Yamagishi, Youji Houki, Shigetake Iwata, Shigeo Kayashima, Satoshi Maeda