Patents by Inventor Takashi Oku

Takashi Oku 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).

  • Publication number: 20080303757
    Abstract: Disclosed herein is a light emitting device, including: a light emitting diode; an sealing resin member having an arrangement face and configured to seal the light emitting diode; and a lens disposed on the arrangement face of the sealing resin member and formed so as to have a circular shape as viewed in the direction of an optical axis of light emitted from the light emitting diode, the lens having a concave portion formed at a central portion in such a manner as to be concave toward the sealing resin member.
    Type: Application
    Filed: June 5, 2008
    Publication date: December 11, 2008
    Applicant: SONY CORPORATION
    Inventors: Shingo Ohkawa, Takashi Oku, Kenichi Nakaki, Tetsuo Shibanuma
  • Publication number: 20080304265
    Abstract: A light emitting device includes a plurality of light emitting diodes, a plurality of sealing resins, and a lens body formed in substantially a shape of a flat plate for guiding the light. The lens body is also disposed in a state of extending over the disposition surface of each sealing resin. The lens body includes a plurality of lens parts and a plurality of light guiding parts for reflecting the light by inside surfaces of the light guiding parts. The plurality of lens parts and the plurality of light guiding parts of the lens body are formed integrally with each other. The lens parts are disposed on the respective disposition surfaces of the sealing resins, and a plurality of light emitting function parts for sending out the light reflected by the inside surfaces of the light guiding parts are formed in the light guiding parts.
    Type: Application
    Filed: June 5, 2008
    Publication date: December 11, 2008
    Applicant: Sony Corporation
    Inventors: Shingo Ohkawa, Takashi Oku, Kenichi Nakaki, Tetsuo Shibanuma
  • Publication number: 20080285268
    Abstract: Disclosed is a backlight device for illuminating a transmissive color liquid crystal display panel from its backside with white light. The backlight device includes, as a light source, a plural number of principal light emitting diode units 21mn, and a plural number of subsidiary light emitting diode units 21mn, where m and n are natural numbers. Each principal light emitting diode unit is made up by a plural number of light emitting diodes (21) arrayed in a string and emits white light of preset chromaticity. Each subsidiary light emitting diode unit is made up by a plural number of light emitting diodes (21) arrayed in a string and emits white light of chromaticity in the vicinity of the preset chromaticity. The number of the subsidiary light emitting diode units is smaller than that of the principal light emitting diode units.
    Type: Application
    Filed: October 24, 2005
    Publication date: November 20, 2008
    Inventors: Takashi Oku, Takeo Arai, Yutaka Ota, Yasuhiro Tagawa
  • Publication number: 20080198570
    Abstract: The present invention relates to a backlight apparatus and a liquid crystal display apparatus, capable of realizing a backlight apparatus having high color reproductivity without color irregularities in a backlight apparatus having a LED device as its light source. In the optical unit 61, there are disposed the dichroic mirror B which transmits green light Lg and red light Lr and reflects blue light Lb, the dichroic mirror G which transmits the light Lb and the light Lr and reflects the light Lg, and the dichroic mirror R which transmits the light Lb and the light Lg and reflects the light Lr, and they transmit or reflect the light emitted from the LED devices 11B, 11G and 11R to mix to form the white light Lw. The light Lw formed by the dichroic mirrors B, G and R is entered to the light guiding plate 62 by the mirror performing a total reflection.
    Type: Application
    Filed: March 24, 2008
    Publication date: August 21, 2008
    Inventors: Masato Hatanaka, Kazuhiro Yokota, Haruaki Wada, Takashi Oku
  • Patent number: 7413331
    Abstract: The present invention relates to a backlight apparatus and a liquid crystal display apparatus, capable of realizing a backlight apparatus having high color reproductivity without color irregularities in a backlight apparatus having a LED device as its light source. In the optical unit 61, there are disposed the dichroic mirror B which transmits green light Lg and red light Lr and reflects blue light Lb, the dichroic mirror G which transmits the light Lb and the light Lr and reflects the light Lg, and the dichroic mirror R which transmits the light Lb and the light Lg and reflects the light Lr, and they transmit or reflect the light emitted from the LED devices 11B, 11G and 11R to mix to form the white light Lw. The light Lw formed by the dichroic mirrors B, G and R is entered to the light guiding plate 62 by the mirror performing a total reflection.
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: August 19, 2008
    Assignee: Sony Corporation
    Inventors: Masato Hatanaka, Kazuhiro Yokota, Haruaki Wada, Takashi Oku
  • Publication number: 20080186433
    Abstract: A color filter (19) used in a transmissive color liquid crystal display panel of a color liquid crystal display (LCD) apparatus. This color filter (19) is constituted by a tristimulus color filter for wavelength-selecting and transmitting red light, green light and blue light. Mixing of blue color and red color is prohibited by not having the transmission wavelength band of the red filter CFR overlaid substantially on the transmission wavelength band of the blue filter CFB.
    Type: Application
    Filed: July 12, 2005
    Publication date: August 7, 2008
    Inventors: Shuichi Haga, Koichiro Kakinuma, Takehiro Nakatsue, Tatsuhiko Matsumoto, Yasuhiro Tagawa, Yutaka Ota, Takashi Oku, Takeo Arai
  • Publication number: 20080117356
    Abstract: A light source apparatus used in a backlight apparatus is disclosed. The light source apparatus includes a light-emitting diode unit and a wiring board. The light-emitting diode unit is provided as one unit by nonlinearly and closely placing respective light-emitting diodes of red, green, and blue colors, at least the light-emitting diode of one color out of the light-emitting diodes of the respective colors being constituted by first and second light-emitting diodes having different chromaticities such that an average chromaticity of the first and second light-emitting diodes is a predetermined chromaticity. On the wiring board, a plurality of light-emitting diode units are arranged at predetermined intervals in a predetermined direction.
    Type: Application
    Filed: November 19, 2007
    Publication date: May 22, 2008
    Applicant: SONY CORPORATION
    Inventors: Takashi Oku, Naoto Kobayashi, Tomohisa Uba
  • Publication number: 20080024696
    Abstract: Disclosed is a color liquid crystal display apparatus (LCD) employing a transmissive color liquid crystal panel. The LCD includes three green (G) light emitting diodes (21G), two red (R) light emitting diodes (21R) and two blue (B) light emitting diodes (21B). A light source unit for backlight (30A) and a light source unit for backlight (30B) are adapted for mixing three prime-color light beams (R, B, G), radiated from the seven light emitting diodes (21), arranged as one light emitting diode unit, and for radiating the resulting mixed light. A color liquid crystal display panel (110) is illuminated from its backside by a liquid crystal display backlight device for liquid crystal display (140) made up by a plural number of light source units for backlight (30A) and a plural number of light source units for backlight (30B).
    Type: Application
    Filed: September 29, 2005
    Publication date: January 31, 2008
    Applicant: Sony Corporation
    Inventors: Takeo Arai, Takashi Oku
  • Patent number: 7318664
    Abstract: A light dimming dot pattern is provided for an LCD in which the diameter of dots is changed in a range from approximately 0.16 mm to approximately 0.65 mm depending on the distance of the dots from a fluorescent tube (13) in such a manner that the volume of the shielded light is increased and decreased at a location close to a position overlying the fluorescent tube (13) and at a location remote from the fluorescent tube (13), respectively. In this manner, a light dimming dot pattern with a transmittance for all light rays of approximately 62% (roughly in the vicinity of 62%), higher than the transmittance for all light rays in the conventional technique not higher than 50%, is produced. Consequently, the light of uniform high luminance may be produced without raising the luminance of the fluorescent tube (13), and hence an LCD of high luminance may be realized.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: January 15, 2008
    Assignee: Sony Corporation
    Inventors: Masato Hatanaka, Kazuhiro Yokota, Takashi Oku, Shinsuke Kito, Yuichiro Maruyama, Sinobu Yamada, Kouji Iida, Seiji Miyamura
  • Publication number: 20070182887
    Abstract: Disclosed is a backlight device used for a color liquid crystal display (LCD) apparatus. The red light, green light and blue light, generated by a light source, made up by a red light emitting diode (21R), a green light emitting diode (21G) and a blue light emitting diode (21B), respectively, are mixed together to generate white light. The red light has a half-value width hwr such that 15 nm?hwr?30 nm, and the green light has a half-value width hwg such that 25 nm?hwg?50 nm. The blue light has a half-value width hwb such that 15 nm?hwb?30 nm. The white light illuminates a transmissive color liquid crystal display panel (10) from its back side. The transmissive color liquid crystal display panel includes a color filter (19) made up by a tristimulus filter for wavelength-selecting and transmitting red light, green light and blue light.
    Type: Application
    Filed: August 9, 2005
    Publication date: August 9, 2007
    Inventors: Shuichi Haga, Koichiro Kakinuma, Takehiro Nakatsue, Tatsuhiko Matsumoto, Yasuhiro Tagawa, Yutaka Ota, Takashi Oku, Takeo Arai
  • Publication number: 20070121320
    Abstract: The present invention is directed to a backlight device using light emitting units (7) in which a large number of light emitting diodes (12) are mounted, which comprises a reflection plate (16) for reflecting rays of light which have been emitted from a light emitting unit (11), wherein the reflection plate (16) is composed of a bottom surface reflection plate (16a) for reflecting rays of light emitted from the light emitting units (7) from the bottom surface direction, side surface reflection plates (16b) to (16e) for reflecting rays of light emitted from the light emitting units (7) from respective forward and backward, and left and right side surface directions, and corner reflection plates (16f) to (16i) in which the bottom surface reflection plate (16a) and the side surface reflection plates (16b) to (16e) are connected to cover the respective corner portions, and serves to permit rays of light incident onto a display panel (1) to be uniform to realize uniformity of brightness of the entire surface there
    Type: Application
    Filed: August 15, 2005
    Publication date: May 31, 2007
    Inventors: Takeo Arai, Takashi Oku
  • Publication number: 20070086181
    Abstract: A light dimming dot pattern is provided for an LCD in which the diameter of dots is changed in a range from approximately 0.16 mm to approximately 0.65 mm depending on the distance of the dots from a fluorescent tube (13) in such a manner that the volume of the shielded light is increased and decreased at a location close to a position overlying the fluorescent tube (13) and at a location remote from the fluorescent tube (13), respectively. In this manner, a light dimming dot pattern with a transmittance for all light rays of approximately 62% (roughly in the vicinity of 62%), higher than the transmittance for all light rays in the conventional technique not higher than 50%, is produced. Consequently, the light of uniform high luminance may be produced without raising the luminance of the fluorescent tube (13), and hence an LCD of high luminance may be realized.
    Type: Application
    Filed: December 19, 2006
    Publication date: April 19, 2007
    Inventors: Masato Hatanaka, Kazuhiro Yokota, Takashi Oku, Shinsuke Kito, Yuichiro Maruyama, Sinobu Yamada, Kouji Iida, Seiji Miyamura
  • Publication number: 20070064445
    Abstract: The present invention relates to a backlight apparatus and a liquid crystal display apparatus, capable of realizing a backlight apparatus having high color reproductivity without color irregularities in a backlight apparatus having a LED device as its light source. In the optical unit 61, there are disposed the dichroic mirror B which transmits green light Lg and red light Lr and reflects blue light Lb, the dichroic mirror G which transmits the light Lb and the light Lr and reflects the light Lg, and the dichroic mirror R which transmits the light Lb and the light Lg and reflects the light Lr, and they transmit or reflect the light emitted from the LED devices 11B, 11G and 11R to mix to form the white light Lw. The light Lw formed by the dichroic mirrors B, G and R is entered to the light guiding plate 62 by the mirror performing a total reflection.
    Type: Application
    Filed: September 24, 2004
    Publication date: March 22, 2007
    Inventors: Masato Hatanaka, Kazuhiro Yokota, Haruaki Wada, Takashi Oku
  • Patent number: 7185995
    Abstract: A light dimming dot pattern is provided for an LCD in which the diameter of dots is changed in a range from approximately 0.16 mm to approximately 0.65 mm depending on the distance of the dots from a fluorescent tube (13) in such a manner that the volume of the shielded light is increased and decreased at a location close to a position overlying the fluorescent tube (13) and at a location remote from the fluorescent tube (13), respectively. In this manner, a light dimming dot pattern with a transmittance for all light rays of approximately 62% (roughly in the vicinity of 62%), higher than the transmittance for all light rays in the conventional technique not higher than 50%, is produced. Consequently, the light of uniform high luminance may be produced without raising the luminance of the fluorescent tube (13), and hence an LCD of high luminance may be realized.
    Type: Grant
    Filed: August 18, 2004
    Date of Patent: March 6, 2007
    Assignee: Sony Corporation
    Inventors: Masato Hatanaka, Kazuhiro Yokota, Takashi Oku, Shinsuke Kito, Yuichiro Maruyama, Sinobu Yamada, Kouji Iida, Seiji Miyamura
  • Publication number: 20060268568
    Abstract: The present invention relates to a backlight and a light guide plate, a method of manufacturing a diffuser and the light guide plate, and to a liquid crystal display apparatus, all enabling a cost reduction by reducing the parts count and curtailing unnecessary manufacturing processing. A diffuser 261 has a light distribution layer 181 including a prismatic surface wherein stripe grooves or asperities are arrayed in parallel with each other, a diffusion layer 182 containing diffusion elements 191 for diffusing incident light, and a light incidence control layer 271 including a prismatic surface wherein stripe grooves or asperities are arrayed in parallel on a side of fluorescent tubes 131. The diffusion layer 182 is formed from the same resin, and only the diffusion elements 191 are formed from a different resin.
    Type: Application
    Filed: September 24, 2004
    Publication date: November 30, 2006
    Inventors: Takashi Oku, Masato Hatanaka, Yoshinari Kawashima, Akira Koshimura, Kazuhiro Shiratori
  • Publication number: 20060215386
    Abstract: A light dimming dot pattern is provided for an LCD in which the diameter of dots is changed in a range from approximately 0.16 mm to approximately 0.65 mm depending on the distance of the dots from a fluorescent tube (13) in such a manner that the volume of the shielded light is increased and decreased at a location close to a position overlying the fluorescent tube (13) and at a location remote from the fluorescent tube (13), respectively. In this manner, a light dimming dot pattern with a transmittance for all light rays of approximately 62% (roughly in the vicinity of 62%), higher than the transmittance for all light rays in the conventional technique not higher than 50%, is produced. Consequently, the light of uniform high luminance may be produced without raising the luminance of the fluorescent tube (13), and hence an LCD of high luminance may be realized.
    Type: Application
    Filed: August 18, 2004
    Publication date: September 28, 2006
    Inventors: Masato Hatanaka, Kazuhiro Yokota, Takashi Oku, Shinsuke Kito, Yuichiro Maruyama, Sinobu Yamada, Kouji Iida, Sejii Miyamura
  • Publication number: 20060170319
    Abstract: A backlight device is provided that realizes high luminance while widening the color range. The backlight device illuminates a transmissive color liquid crystal display panel with white light from a back side of the transmissive color liquid crystal display panel having a color filter made of a three-primary-color filter which selectively transmits light having wavelengths of red light, green light, and blue light. The backlight device includes a plurality of cold cathode fluorescent lamp tubes having tube walls coated with a wide-color-range fluorescent material. The backlight device also includes a diffusion plate which diffuses white light emitted from the cold cathode fluorescent lamp tubes, illuminates the color liquid crystal display panel with the diffused white light, and is positioned at a predetermined distance from the cold cathode fluorescent lamp tubes.
    Type: Application
    Filed: January 12, 2006
    Publication date: August 3, 2006
    Inventors: Takashi Oku, Yoshinori Yamazaki, Tsuneo Kusunoki, Katsutoshi Ohno, Takahiro Igarashi
  • Publication number: 20050269560
    Abstract: A white light having a less light of a wavelength except wavelength bands showing red, green and blue colors and a sufficient amount of light is emitted to illuminate a liquid crystal panel.
    Type: Application
    Filed: June 2, 2005
    Publication date: December 8, 2005
    Applicant: Sony Corporation
    Inventor: Takashi Oku
  • Patent number: 6822705
    Abstract: Provided are a reflective liquid crystal display and a light guide plate capable of eliminating a decline in virtual contrast properties of a display screen in a reflective liquid crystal display comprising a light guide plate with a prism unit so as to display an excellent image. An antireflective film (40) is formed on a planar surface of a light guide plate (50) which is disposed so as to face a viewing side of a liquid crystal display panel (10). The antireflective film (40) inhibits light reflection on the planar surface of the light guide plate (50). Moreover, an adhesive layer (51) is provided to improve the adhesion of the antireflective film (40) to the planar surface of the light guide plate (50).
    Type: Grant
    Filed: November 20, 2002
    Date of Patent: November 23, 2004
    Assignee: Sony Corporation
    Inventors: Kazuhito Shimoda, Junichi Ohsako, Yoshinari Kawashima, Takashi Oku
  • Publication number: 20030076465
    Abstract: Provided are a reflective liquid crystal display and a light guide plate capable of eliminating a decline in virtual contrast properties of a display screen in a reflective liquid crystal display comprising a light guide plate with a prism unit so as to display an excellent image. An antireflective film (40) is formed on a planar surface of a light guide plate (50) which is disposed so as to face a viewing side of a liquid crystal display panel (10). The antireflective film (40) inhibits light reflection on the planar surface of the light guide plate (50). Moreover, an adhesive layer (51) is provided to improve the adhesion of the antireflective film (40) to the planar surface of the light guide plate (50).
    Type: Application
    Filed: November 20, 2002
    Publication date: April 24, 2003
    Inventors: Kazuhito Shimoda, Junichi Ohsako, Yoshinari Kawshima, Takashi Oku