Patents by Inventor Tetsuo Hattori
Tetsuo Hattori 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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Publication number: 20010033253Abstract: To suppress light loss without deteriorating resolution of a projected image, light is first polarized and separated by a polarizing beam splitter. Green light is separated from a light flux emitted by the polarizing beam splitter by a dichroic mirror having a green light reflection property. A light flux containing blue and red light, which is transmitted by the dichroic mirror, is separated into red light and blue light by a dichroic prism. Resultant color light is modulated and reflected by reflection light valves, returned to the corresponding dichroic mirror or dichroic prism, and combined by the dichroic mirror and the dichroic prism. Resultant combined color light is projected via the polarizing beam splitter and a projection lens. The dichroic prism transmits s-polarized light having wavelengths less than a wavelength substantially within a wavelength band of green light and reflects s-polarized light having larger wavelengths.Type: ApplicationFiled: June 22, 2001Publication date: October 25, 2001Inventors: Yuji Manabe, Tetsuo Hattori
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Patent number: 6249378Abstract: A mirror comprises a transparent glass substrate and a dielectric multilayer film laminated on one surface (entrance surface) of the glass substrate. The dielectric multilayer film is formed by layers made of a high refractive index material and layers made of a low refractive index material which are alternately laminated, and is applied to a projection type display apparatus. The material and thickness of each layer are set so as to yield a polarization characteristic for causing reflected light to approach linearly polarized light.Type: GrantFiled: February 27, 1998Date of Patent: June 19, 2001Assignee: Nikon CorporationInventors: Naotaka Shimamura, Tetsuo Hattori, Mikio Okamoto
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Patent number: 6227670Abstract: The projection type display apparatus according to the present invention has a prism for separating incident light into a plurality of light components and combining the plurality of modulated color components. The prism is constituted by a plurality of prism assemblies, each including an optical member made of an optically transparent material having a photoelastic constant whose absolute value is not greater than +1.5×10−8 cm2/N with respect to the incident light. More preferably, these plurality of prism assemblies are arranged such that each of a plurality of the separated color components is totally reflected by any of the prism assemblies.Type: GrantFiled: August 16, 1999Date of Patent: May 8, 2001Assignee: Nikon CorporationInventors: Kiyoshi Numazaki, Yuji Manabe, Tetsuo Hattori
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Publication number: 20010000678Abstract: The projection type display apparatus according to the present invention has a prism for separating incident light into a plurality of light components and combining the plurality of modulated color components. The prism is constituted by a plurality of prism assemblies, each including an optical member made of an optically transparent material having a photoelastic constant whose absolute value is not greater than +1.5×10−8 cm2/N with respect to the incident light. More preferably, these plurality of prism assemblies are arranged such that each of a plurality of the separated color components is totally reflected by any of the prism assemblies.Type: ApplicationFiled: December 14, 2000Publication date: May 3, 2001Inventors: Tetsuo Hattori, Masatoshi Sato, Mikio Okamoto, Yoshiro Oikawa
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Patent number: 6223196Abstract: The present invention provides for the sharing of a MAC unit included in a sub-processor by the sub-processor and a host processor, so that the period of time for the operation of the host processor is reduced, and the overall performance of the integrated dual processor module is enhanced.Type: GrantFiled: May 8, 1998Date of Patent: April 24, 2001Assignee: International Business Machines CorporationInventors: Tetsuo Hattori, Yasuhiro Matsumoto
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Patent number: 6141151Abstract: Apparatus are disclosed that provide a high-luminance projected image with no color shading or uneven contrast. Light from a light source undergoes color separation by passing through a color-separation optical system (e.g., a cross-dichroic mirror or cross-dichroic prism). The light from the light source can also be split into first and second polarized lights by passage through, e.g., a first polarized-light beamsplitter (PBS). Each color-separated light is modulated by a respective color-signal light valve and undergoes color combining by, e.g., a cross-dichroic prism. The second polarized light, if formed, is modulated by a luminance-signal light valve, undergoes color combining and polarized-light combining by, e.g., a second PBS, and is projected by a projection lens (that comprises an aperture stop). The PBSs, cross-dichroic mirrors, and cross-dichroic prisms are situated where principal rays (defined by the aperture stop) are parallel to the optical axis.Type: GrantFiled: July 21, 1999Date of Patent: October 31, 2000Assignee: Nikon CorporationInventors: Hideaki Shimonura, Yuji Manabe, Tetsuo Hattori, Masaaki Kusano, Atsushi Sekine
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Patent number: 6101041Abstract: A cross dichroic prism comprises four triangular prisms having isosceles right triangular cross sections identical in shape, opposing side faces thereof being bonded and secured together with rectangular portions thereof facing each other; and a dichroic film having an X-shaped cross section formed between the bonding faces of the triangular prisms; wherein, of the four triangular prisms, a given prism and at least one of the prisms adjacent thereto have a refractive index difference therebetween of 0.00005 or less, and the remaining two prisms opposed thereto have a refractive index difference therebetween of 0.00005 or less.Type: GrantFiled: September 2, 1998Date of Patent: August 8, 2000Assignee: Nikon CorporationInventors: Kazufumi Ishibashi, Tetsuo Hattori, Kiyoshi Numazaki, Yasuhiro Iwaguchi, Shuichi Sugai, Tadaaki Nakamura, Masaaki Kusano
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Patent number: 6067193Abstract: A polarization device comprises: a light source; a first lens plate including a plurality of lenses in a planar configuration that divides light emitted from the light source into beams defined by apertures of the plurality of lenses; a second lens plate which is different from the first plate and includes a plurality of lenses in a planar configuration, the plurality of lenses of the first lens plate individually forming light spots at the plurality of lenses of the second lens plate; a polarization beam splitter array constituted of a plurality of polarization beam splitters provided continuously, that performs polarization splitting of light that has been emitted from the light spots of the plurality of lenses of the second lens plate and has entered therein to split the light into p-polarized light and s-polarized light, and emits the split light; and halfwave plates provided at an emission surface of the polarization beam splitter array that convert polarized light emitted from the polarization beam spliType: GrantFiled: October 14, 1998Date of Patent: May 23, 2000Assignee: Nikon CorporationInventors: Atsushi Sekine, Hideaki Shimomura, Tetsuo Hattori
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Patent number: 6062694Abstract: The present invention relates to a projection type display apparatus which utilizes a polarizing beam splitter and/or a color separating/combining optical system, each being constituted by an optically transparent material block having a specific characteristic, thereby being capable of securing optically stable performances against influences of various thermal and external stresses and suppressing image quality deterioration to a low level. In particular, in this projection type display apparatus, the polarizing beam splitter used for a polarized light separating optical system and analyzing optical system, and/or an optical member servicing as a color separating/combining optical system are constituted by an optically transparent material block in which a wavelength where the absolute value of a photoelastic constant becomes a minimum level exists in a wavelength range of a blue light component.Type: GrantFiled: December 18, 1997Date of Patent: May 16, 2000Assignee: Nikon CorporationInventors: Yoshiro Oikawa, Motoi Ueda, Kazufumi Ishibashi, Masaaki Kusano, Tetsuo Hattori
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Patent number: 6028703Abstract: In the present projection apparatus, R, G and B lights in the form of a S polarized light emitted from a fly-eye lens and a field lens are separated and the S polarized light is converted to a P polarized light so that it is illuminated onto a light valve. The S polarized light separated by the polarization beam splitter is illuminated onto the light valve converted to the P polarized light without being discarded, illuminance of the light onto the light valve is uniform and its polarization azimuth is arranged in the form of the P polarized light.Type: GrantFiled: March 13, 1998Date of Patent: February 22, 2000Assignee: Nikon CorporationInventors: Atsushi Sekine, Tetsuo Hattori
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Patent number: 6010221Abstract: An analyzing-synthesizing optical system has the structure in which for each of the three primary colors of R, G, and B, there are provided a light valve for modulating incident light and a polarization beam splitter for guiding specific polarized light to this light valve and extracting only modulated light coming from the light valve to output it, wherein these light valves and polarization beam splitters are fixed as integrated with a synthesizing optical system comprising a cross dichroic prism and wherein optical path lengths of optical paths of the respective colors are adjusted to be almost equal to each other. A projection image display apparatus comprises the analyzing-synthesizing optical unit.Type: GrantFiled: May 19, 1998Date of Patent: January 4, 2000Assignee: Nikon CorporationInventors: Hiroshi Maki, Kiyoshi Numazaki, Masaaki Kusano, Tetsuo Hattori, Atsushi Sekine
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Patent number: 5959778Abstract: Apparatus is disclosed that provides a high-luminance projected image with no color shading or uneven contrast. Light from a light source undergoes color separation by passing through a color-separation optical system (e.g., a cross-dichroic mirror or cross-dichroic prism). The light from the light source can also be split into first and second polarized lights by passage through, e.g., a first polarized-light beamsplitter (PBS). Each color-separated light is modulated by a respective color-signal light valve and undergoes color combining by, e.g., a cross-dichroic prism. The second polarized light, if formed, is modulated by a luminance-signal light valve, undergoes color combining and polarized-light combining by, e.g., a second PBS, and is projected by a projection lens (that comprises an aperture stop). The PBSs, cross-dichroic mirrors, and cross-dichroic prisms are situated where principal rays (defined by the aperture stop) are parallel to the optical axis.Type: GrantFiled: December 11, 1997Date of Patent: September 28, 1999Assignees: Nikon Corporation, Mitsubishi Denki Kabushiki KaishaInventors: Hideaki Shimonura, Yuji Manabe, Tetsuo Hattori, Masaaki Kusano, Atsushi Sekine
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Patent number: 5946056Abstract: In order to obtain an image without a registration shift, there is provided a color composing optical system which comprises a liquid crystal light valve having a plurality of pixels and a cross dichroic prism for color-composing the light beams emitted from the liquid crystal light valve, characterized in that the following equation is satisfied:L.times..vertline.tan.THETA..vertline..ltoreq.W/2,where the length of a pixel pitch of the liquid crystal light valve is W, the air-converted length from the liquid crystal light valve emission surface to the emission surface of the cross dichroic prism is L, and a value of a relative angular deviation when two light rays emitted from the liquid crystal light valve in parallel with the optical axis enter the cross dichroic prism and then are emitted from the cross dichroic prism is .THETA..Type: GrantFiled: July 13, 1998Date of Patent: August 31, 1999Assignee: Nikon CorporationInventors: Kazufumi Ishibashi, Tetsuo Hattori
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Patent number: 5817255Abstract: A display has a liquid crystal composite layer interposed between a pair of substrates on which electrodes-are formed. The liquid crystal composite layer is comprised of a matrix and liquid crystal droplets dispersed therein. The matrix is composed of an inorganic oxide or its gel of the formula MOx (M: one or more metal elements selected from, La, Y, Ti, Zr, Hf, V, Nb, Ta, Al, Ga, Ge, Pb or Sb; x: half of the total valence number of the one or more metal elements), or a mixture thereof with an inorganic oxide or its gel of formula ABOx (A: one or more metal elements selected from alkaline earth metals, rare earth metals or Pb; B: one or more metal elements of transition metals; x: a number larger than 0 (zero) and not-larger than 3). A polymer soluble in polar solvent may be added to adjust the dielectric constant of the matrix.Type: GrantFiled: August 29, 1996Date of Patent: October 6, 1998Assignee: Nikon CorporationInventors: Akira Tanaka, Tetsuo Hattori, Motoyuki Toki
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Patent number: 5798819Abstract: Methods and apparatus are disclose for obtaining a bright projected color image. In a representative apparatus, polarized beam splitters (one for each primary color of an image to be projected) separate p-polarized light and s-polarized light for each of the primary colors. Each separated s- and p-polarized light for each color enters a respective spatial light modulator. For each primary color, modulated light fluxes produced by the two spatial light modulators, which perform modulation of the same image, are analyzed and integrated by the polarized beam splitters. The analyzed and integrated light fluxes for each primary color are color integrated, either by projection using separate projection lenses for each color, or by a cross-dichroic prism followed by projection using a single lens.Type: GrantFiled: December 11, 1996Date of Patent: August 25, 1998Assignee: Nikon CorporationInventors: Tetsuo Hattori, Yoshiro Oikawa
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Patent number: 5794080Abstract: When a power switch is turned on, first and second analog switches are turned on while a third analog switch is turned off. Accordingly, at the time of starting, a forced excitation driving circuit supplies to a vibrator an oscillation output pulse which is substantially at the resonance frequency of the vibrator, thereby forcibly driving the vibrator in an excitation manner. Thereafter, when the vibrator substantially attains its stationary state and thereby the charged voltage of a capacitor reaches a threshold value of an inverter, the first and second analog switches are turned off while the third analog switch is turned on. Accordingly, the output of a self-excitation circuit is supplied to the electrode of the vibrator so as to vibrate the vibrator in a self-excitation manner.Type: GrantFiled: June 13, 1996Date of Patent: August 11, 1998Assignee: Nikon CorporationInventors: Shunji Watanabe, Tatsushi Nomura, Takamitsu Fujiu, Yoshinori Sango, Toru Fujii, Tetsuo Hattori
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Patent number: 5777696Abstract: The projection apparatus of the present invention includes a light source; a three-color separation means such as a cross dichroic prism or a cross dichroic mirror; three first polarization beam splitters; three spatial light modulators; three write image formation devices; and a projection optical system. The three-color separation means and the three first polarization beam splitters all lie in a single plane, and the three first polarization beam splitters are so arranged that a reflected light beam is emitted from each of the three first polarization beam splitters in the same direction.Type: GrantFiled: December 15, 1995Date of Patent: July 7, 1998Assignee: Nikon CorporationInventors: Shingo Inoue, Tetsuo Hattori, Sampei Esaki
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Patent number: 5765046Abstract: A piezoelectric angular velocity meter includes a piezoelectric element. The piezoelectric element includes a first piezoelectric element and a second piezoelectric element bonded to the first piezoelectric element. The second piezoelectric element includes a second member made of a piezoelectric crystal, and upper- and lower-surface electrodes sandwiching the second member. The first piezoelectric element is fixed to the upper-surface electrode of said second piezoelectric element with an adhesive. The first piezoelectric element includes a first member made of a piezoelectric crystal, upper-surface electrodes, and a lower-surface electrode. The upper- and lower-surface electrodes sandwich the first member of the first piezoelectric element. The piezoelectric element is supported by two support portions.Type: GrantFiled: April 10, 1996Date of Patent: June 9, 1998Assignee: Nikon CorporationInventors: Shunji Watanabe, Tatsushi Nomura, Takamitsu Fujiu, Yoshinori Sango, Toru Fujii, Tetsuo Hattori
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Patent number: 5716122Abstract: The present invention relates to optical apparatus provided with an optical element for outputting polarized light beams separated generally in parallel. The optical apparatus according to this invention comprises an optical element having a pair of optical members being prisms cross sections of which are right-angled triangles similar to each other, each having a vertex angle of less than 45 degrees, and being constructed in a unitary double prism structure in which the optical members are cemented to each other between side faces thereof, each side face being between the right angle and the vertex angle of less than 45 degrees out of two orthogonal side faces of each optical member, and a polarization splitting portion comprising an optical thin film group formed on the cemented faces of the double prism structure to polarization-split light incident thereto.Type: GrantFiled: August 23, 1995Date of Patent: February 10, 1998Assignee: Nikon CorporationInventors: Sampei Esaki, Kunihiko Yoshino, Shingo Inoue, Katsuhiko Katano, Tetsuo Hattori
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Patent number: 5690407Abstract: A shutter has a cylindrical take-up member rotatable about the central shaft thereof, and a thin board having one end portion thereof fixed to the outer peripheral surface of the take-up member and deformable into a state rolled on the outer peripheral surface of the take-up member and having a spring force for returning to a flat state. The thin board is capable of operating between a liberating position in which in conformity with the rotated position of the take-up member, it is rolled onto the take-up member and retracts from a predetermined optical path to thereby permit the passage of light in the optical path and an intercepting position in which it is unrolled from the take-up member and assumes a flat shape and protrudes into the predetermined optical path to thereby intercept the light.Type: GrantFiled: May 29, 1996Date of Patent: November 25, 1997Assignee: Nikon CorporationInventors: Nobuyuki Kikuchi, Yoshiro Oikawa, Tetsuo Hattori