Patents by Inventor Shigeru Inaoka
Shigeru Inaoka 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: 7460300Abstract: A screen for use in a projection-type image display apparatus having an image displaying element which includes a plurality of pixels for modulating light from a light source so as to form an enlarged picture on the screen. The screen includes a Fresnel lens sheet, a first sheet disposed on the light emission side of the Fresnel lens sheet, and a second sheet disposed on a light emission side of the first sheet. The first sheet includes a plurality of lenticular lenses which extend in a longitudinal direction and are arranged in a horizontal direction, with light passing window portions being formed at positions opposing the lenticular lenses and with light absorbing portions provided therebetween.Type: GrantFiled: May 21, 2007Date of Patent: December 2, 2008Assignee: Hitachi, Ltd.Inventors: Koji Hirata, Shigeru Inaoka
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Publication number: 20070223089Abstract: A screen for use in a projection-type image display apparatus having an image displaying element which includes a plurality of pixels for modulating light from a light source so as to form an enlarged picture on the screen. The screen includes a Fresnel lens sheet, a first sheet disposed on the light emission side of the Fresnel lens sheet, and a second sheet disposed on a light emission side of the first sheet. The first sheet includes a plurality of lenticular lenses which extend in a longitudinal direction and are arranged in a horizontal direction, with light passing window portions being formed at positions opposing the lenticular lenses and with light absorbing portions provided therebetween.Type: ApplicationFiled: May 21, 2007Publication date: September 27, 2007Inventors: Koji Hirata, Shigeru Inaoka
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Patent number: 7221507Abstract: A screen for use in a projection-type image display apparatus having an image displaying element which includes a plurality of pixels for modulating light from a light source so as to form an enlarged picture on the screen. The screen includes a Fresnel lens sheet having Fresnel lenses on a light emission side, a first sheet disposed on the light emission side of the Fresnel lens sheet, and a second sheet disposed on a light emission side of the first sheet and adhered thereto. The first sheet includes a plurality of lenticular lenses formed on a light incident side which extend in a longitudinal direction and are arranged in a horizontal direction, with light passing window portions being formed at positions opposing the lenticular lenses and with light absorbing portions provided therebetween. The second sheet includes a light scattering element therein.Type: GrantFiled: January 5, 2006Date of Patent: May 22, 2007Assignee: Hitachi, Ltd.Inventors: Koji Hirata, Shigeru Inaoka
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Publication number: 20060114559Abstract: A screen for use in a projection-type image display apparatus having an image displaying element which includes a plurality of pixels for modulating light from a light source so as to form an enlarged picture on the screen. The screen includes a Fresnel lens sheet having Fresnel lenses on a light emission side, a first sheet disposed on the light emission side of the Fresnel lens sheet, and a second sheet disposed on a light emission side of the first sheet and adhered thereto. The first sheet includes a plurality of lenticular lenses formed on a light incident side which extend in a longitudinal direction and are arranged in a horizontal direction, with light passing window portions being formed at positions opposing the lenticular lenses and with light absorbing portions provided therebetween. The second sheet includes a light scattering element therein.Type: ApplicationFiled: January 5, 2006Publication date: June 1, 2006Inventors: Koji Hirata, Shigeru Inaoka
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Patent number: 7023616Abstract: A screen for allowing light generated by a light source and modulated by a picture display device having pixels laid out to form a matrix to produce an image thereon to be projected on the screen as an enlarged picture. The screen has a Fresnel lens sheet forming Fresnel lenses at an emission side, a first member for receiving light emitted from the Fresnel lens sheet having light passing windows, and a plurality of light absorbing layers and a second member placed on the emission side of the first member. A pitch of the light absorbing layers is made smaller than a pitch in a first direction of pixels projected and enlarged on the screen, and a pitch in a second direction of the pixels is at least twice of a pitch of the Fresnel lenses.Type: GrantFiled: April 20, 2004Date of Patent: April 4, 2006Assignee: Hitachi, Ltd.Inventors: Koji Hirata, Shigeru Inaoka
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Publication number: 20050001970Abstract: For obtaining both high brightness under condition of small-sized and simplified structure and suppression of increase in temperature of liquid crystal display elements and polarizing elements, in a liquid crystal display apparatus, comprising: a liquid crystal display element 2 for converting light from a light source into display picture depending on a driving signal; an optical projection system 1b containing a first optical element 1a and for projecting said light signal toward an object of projection; exit side polarizing elements 3b; a holding member 6 for holding them with the liquid crystal display element 2; and cooling medium 5; incident side polarizing elements 3a, wherein, a space is defined by either one of the incident side polarizing elements 3a and the liquid crystal display element 2, the first optical element 1a, between the liquid crystal display element 2 and the first optical element 1a, and the holding member 6, and said space is filled up with the cooling medium 5.Type: ApplicationFiled: July 27, 2004Publication date: January 6, 2005Inventors: Toru Numata, Yasuo Otsuka, Mikio Shiraishi, Koji Hirata, Naoyuki Ogura, Shigeru Inaoka, Kazunari Nakagawa, Shigeru Mori, Masahiko Yatsu
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Patent number: 6829031Abstract: For obtaining both high brightness under condition of small-sized and simplified structure and suppression of increase in temperature of liquid crystal display elements and polarizing elements, in a liquid crystal display apparatus, comprising: a liquid crystal display element 2 for converting light from a light source into display picture depending on a driving signal; an optical projection system 1b containing a first optical element 1a and for projecting said light signal toward an object of projection; exit side polarizing elements 3b; a holding member 6 for holding them with the liquid crystal display element 2; and cooling medium 5; incident side polarizing elements 3a, wherein, a space is defined by either one of the incident side polarizing elements 3a and the liquid crystal display element 2, the first optical element 1a, between the liquid crystal display element 2 and the first optical element 1a, and the holding member 6, and said space is filled up with the cooling medium 5.Type: GrantFiled: January 7, 2003Date of Patent: December 7, 2004Assignee: Hitachi, Ltd.Inventors: Toru Numata, Yasuo Otsuka, Mikio Shiraishi, Koji Hirata, Naoyuki Ogura, Shigeru Inaoka, Kazunari Nakagawa, Shigeru Mori, Masahiko Yatsu
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Publication number: 20040196552Abstract: A screen for allowing light generated by a light source and modulated by a picture display device having pixels laid out to form a matrix to produce an image thereon to be projected on the screen as an enlarged picture. The screen has a Fresnel lens sheet forming Fresnel lenses at an emission side, a first member for receiving light emitted from the Fresnel lens sheet having light passing windows, and a plurality of light absorbing layers and a second member placed on the emission side of the first member. A pitch of the light absorbing layers is made smaller than a pitch in a first direction of pixels projected and enlarged on the screen, and a pitch in a second direction of the pixels is at least twice of a pitch of the Fresnel lenses.Type: ApplicationFiled: April 20, 2004Publication date: October 7, 2004Inventors: Koji Hirata, Shigeru Inaoka
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Patent number: 6728031Abstract: A projection optical system is used for projecting a light generated by a light source and modulated by a picture display device comprising pixels laid out to form a matrix on a screen as an enlarged picture. The screen is provided with a Fresnel lens sheet placed on an emission side of the picture display device, a first configuration element and a light passing plate fixed on the emission side of the first configuration element. The first configuration element has lenticular lenses and light absorbing layers. The lenticular lenses are provided on an incidence side of a light passing through the Fresnel lens sheet. The light absorbing layers are each provided at a place in close proximity to the focal point of one of the lenticular lenses and are separated from each other by a predetermined distance for forming light passing windows.Type: GrantFiled: October 5, 1999Date of Patent: April 27, 2004Assignee: Hitachi, Ltd.Inventors: Koji Hirata, Shigeru Inaoka
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Publication number: 20030128338Abstract: A projection optical means is used for projecting a light generated by a light source and modulated by a picture display device comprising pixels laid out to form a matrix on a screen as an enlarged picture. The screen is provided with a Fresnel lens sheet placed on an emission side of the picture display device, a first configuration element and a light passing plate fixed on the emission side of the first configuration element. The first configuration element has lenticular lenses and light absorbing layers. The lenticular lenses are provided on an incidence side of a light passing through the Fresnel lens sheet.Type: ApplicationFiled: October 5, 1999Publication date: July 10, 2003Inventors: KOJI HIRATA, SHIGERU INAOKA
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Publication number: 20030098944Abstract: For obtaining both high brightness under condition of small-sized and simplified structure and suppression of increase in temperature of liquid crystal display elements and polarizing elements, in a liquid crystal display apparatus, comprising: a liquid crystal display element 2 for converting light from a light source into display picture depending on a driving signal; an optical projection system 1b containing a first optical element 1a and for projecting said light signal toward an object of projection; exit side polarizing elements 3b; a holding member 6 for holding them with the liquid crystal display element 2; and cooling medium 5; incident side polarizing elements 3a, wherein, a space is defined by either one of the incident side polarizing elements 3a and the liquid crystal display element 2, the first optical element 1a, between the liquid crystal display element 2 and the first optical element 1a, and the holding member 6, and said space is filled up with the cooling medium 5.Type: ApplicationFiled: January 7, 2003Publication date: May 29, 2003Applicant: Hitachi, Ltd.Inventors: Toru Numata, Yasuo Otsuka, Mikio Shiraishi, Koji Hirata, Naoyuki Ogura, Shigeru Inaoka, Kazunari Nakagawa, Shigeru Mori, Masahiko Yatsu
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Patent number: 6535267Abstract: For obtaining both high brightness under condition of small-sized and simplified structure and suppression of increase in temperature of liquid crystal display elements and polarizing elements, in a liquid crystal display apparatus, comprising: a liquid crystal display element 2 for converting light from a light source into display picture depending on a driving signal; an optical projection system 1b containing a first optical element 1a and for projecting said light signal toward an object of projection; exit side polarizing elements 3b; a holding member 6 for holding them with the liquid crystal display element 2; and cooling medium 5; incident side polarizing elements 3a, wherein, a space is defined by either one of the incident side polarizing elements 3a and the liquid crystal display element 2, the first optical element 1a, between the liquid crystal display element 2 and the first optical element 1a, and the holding member 6, and said space is filled up with the cooling medium 5.Type: GrantFiled: June 22, 2001Date of Patent: March 18, 2003Assignee: Hitachi, Ltd.Inventors: Toru Numata, Yasuo Otsuka, Mikio Shiraishi, Koji Hirata, Naoyuki Ogura, Shigeru Inaoka, Kazunari Nakagawa, Shigeru Mori, Masahiko Yatsu
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Patent number: 6502942Abstract: For providing a rear-projection type display apparatus, and a translucent type sheet for use therein, in particular, using an image modulation element, such as, a liquid crystal or a DMD (Digital Micro-mirror Device), etc.Type: GrantFiled: September 28, 2001Date of Patent: January 7, 2003Assignee: Hitachi, Ltd.Inventors: Shigeru Mori, Yoji Nakayama, Shigeru Inaoka, Kazunari Nakagawa
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Publication number: 20020109915Abstract: For providing a rear-projection type display apparatus, and a translucent type sheet for use therein, in particular, using an image modulation element, such as, a liquid crystal or a DMD (Digital Micro-mirror Device), etc.Type: ApplicationFiled: September 28, 2001Publication date: August 15, 2002Applicant: Hitachi, Ltd.Inventors: Shigeru Mori, Yoji Nakayama, Shigeru Inaoka, Kazunari Nakagawa
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Publication number: 20010033345Abstract: For obtaining both high brightness under condition of small-sized and simplified structure and suppression of increase in temperature of liquid crystal display elements and polarizing elements, in a liquid crystal display apparatus, comprising: a liquid crystal display element 2 for converting light from a light source into display picture depending on a driving signal; an optical projection system 1b containing a first optical element 1a and for projecting said light signal toward an object of projection; exit side polarizing elements 3b; a holding member 6 for holding them with the liquid crystal display element 2; and cooling medium 5; incident side polarizing elements 3a, wherein, a space is defined by either one of the incident side polarizing elements 3a and the liquid crystal display element 2, the first optical element 1a, between the liquid crystal display element 2 and the first optical element 1a, and the holding member 6, and said space is filled up with the cooling medium 5.Type: ApplicationFiled: June 22, 2001Publication date: October 25, 2001Applicant: Hitachi, Ltd.Inventors: Toru Numata, Yasuo Otsuka, Mikio Shiraishi, Koji Hirata, Naoyuki Ogura, Shigeru Inaoka, Kazunari Nakagawa, Shigeru Mori, Masahiko Yatsu
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Patent number: 6256083Abstract: For obtaining both high brightness under condition of small size and simplified structure, and for achieving suppression of increase in temperature of liquid crystal display elements and polarizing elements in a liquid crystal display apparatus, a liquid crystal display element converts light from a light source into a display picture depending on a driving signal, and an optical projection system contains a first optical element and projects a light signal toward an object of projection. A space is defined by an incident side polarizing element or the liquid crystal display element, the first optical element and a holding member, and the space is filled up with a cooling medium.Type: GrantFiled: October 8, 1998Date of Patent: July 3, 2001Assignee: Hitachi, Ltd.Inventors: Toru Numata, Yasuo Otsuka, Mikio Shiraishi, Koji Hirata, Naoyuki Ogura, Shigeru Inaoka, Kazunari Nakagawa, Shigeru Mori, Masahiko Yatsu
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Patent number: 5272540Abstract: In a projection lens device having at least two plastic lenses for magnification-projecting an original image displayed on a display screen onto a screen, one of the two plastic lens is convex at a center thereof toward the screen and concave at a periphery thereof, and the other lens has a weak positive refractive power toward the screen at a center thereof and a stronger positive refractive power at a periphery thereof. A variation of a lens power due to a change of a surrounding environment is cancelled out by the concave shape at the periphery of the one lens and the positive refractive power at the periphery of the other lens.Type: GrantFiled: September 13, 1991Date of Patent: December 21, 1993Assignee: Hitachi, Ltd.Inventors: Koji Hirata, Hiroki Yoshikawa, Tooru Numata, Kiyoshi Wada, Masayuki Muranaka, Isao Yoshizaki, Takahiko Yoshida, Shigeru Inaoka
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Patent number: 5200814Abstract: Disclosed is a projection lens system for use in an optical system for magnifying and projecting original images displayed on plural image display devices onto a screen through projection lenses provided in corresponding relation to the image display devices, which projection lens system comprises plural lens elements and in which according to colors or degrees of fineness of original images, the number of constituent lenses, or the shape of lens surface, or an effective aperture of at least one constituent lens element surface, or the number of constituent lenses and the shape of lens surface, or the number of constituent lenses and an effective aperture of at least one constituent lens element surface, or the shape of lens surface and an effective aperture of at least one constituent lens element surface, or the number of constituent lenses, the shape of lens surface and an effective aperture of at least one constituent lens element surface, are changed at a time.Type: GrantFiled: April 20, 1990Date of Patent: April 6, 1993Assignee: Hitachi, Ltd.Inventors: Koji Hirata, Hiroki Yoshikawa, Takahiko Yoshida, Tooru Numata, Masayuki Muranaka, Kiyoshi Wada, Isao Yoshizaki, Shigeru Inaoka
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Patent number: 4948237Abstract: In a projection system wherein an optical system comprising a first lens for correcting a spherical aberration dependent on the aperture length, a second lens for enlargement and a third lens for correcting a field curvature, projects an image reproduced on a CRT having a curved phosphor surface, onto a screen, the third lens is spaced from the CRT so that the region of the phosphor surface which again totally reflects a light which has been totally reflected by a screen-side surface of the third lens is limited to the edge portion of an effective region of the phosphor surface.Type: GrantFiled: April 29, 1988Date of Patent: August 14, 1990Assignee: Hitachi, Ltd.Inventors: Koji Hirata, Kyohei Fukuda, Hiroki Yoshikawa, Shigeru Mori, Masayuki Muranaka, Isao Yoshizaki, Shigeru Inaoka, Hiroshi Jitsukata