Patents by Inventor Takemasa Yasukawa

Takemasa Yasukawa 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: 7227190
    Abstract: A purple LED is fixed onto lead frames in the cup of a frame using a mount, and the purple LED is sealed by filling a sealant of transparent resin into the cup. Red/green/blue phosphors that absorb a light emitted by the purple LED and emit lights having red, green, blue wavelengths different from the wavelength of this absorbed light are mixed into the sealant. A yellow phosphor that absorbs a light emitted by the purple LED and emits a light having a yellow wavelength different from the wavelength of this absorbed light is additionally mixed into the sealant in such a white light emitting device.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: June 5, 2007
    Assignee: Toyoda Gosei Co., Ltd.
    Inventors: Takemasa Yasukawa, Shota Shimonishi, Koichi Ota
  • Publication number: 20050253158
    Abstract: A purple LED (19) is fixed onto lead frames (14, 15) in the cup (17a) of a frame (17) using a mount (21), and the purple LED (19) is sealed by filling a sealant (26) of transparent resin into the cup (17a). Red/green/blue phosphors (28-30) that absorb a light emitted by the purple LED (19) and emit lights having red, green, blue wavelengths different from the wavelength of this absorbed light are mixed into the sealant (26). A yellow phosphor (31) that absorbs a light emitted by the purple LED (19) and emits a light having a yellow wavelength different from the wavelength of this absorbed light is additionally mixed into the sealant (26) in such a white light emitting device.
    Type: Application
    Filed: September 22, 2003
    Publication date: November 17, 2005
    Inventors: Takemasa Yasukawa, Shota Shomonishi, Koichi Ota
  • Patent number: 6953265
    Abstract: A light source device has a light shielding member having an aperture, a light source arranged on one side of the light shielding member, and a converging member arranged relatively with respect to the light source and the light source to thereby converge light emitted from the light source in the aperture or in a vicinity of the aperture. Another type of light source device has a single light source, and a converging member for converging light from the light source to thereby distribute the light to at least two points. Still another type of light source device has a light source, and a reflecting mirror arranged to enclose a side of a light emission direction of the light source, the reflecting mirror reflecting light emitted from the light source in a direction except the light source so that the light is radiated outside.
    Type: Grant
    Filed: April 25, 2003
    Date of Patent: October 11, 2005
    Assignee: Toyoda Gosei Co., Ltd.
    Inventors: Yoshinobu Suehiro, Yuji Takahashi, Takemasa Yasukawa, Hideaki Kato, Hideki Omoya, Hideyuki Nakano, Hisao Yamaguchi
  • Patent number: 6831305
    Abstract: A group III nitride compound semiconductor light-emitting element of a flip chip bonding type for emitting light with a wavelength not longer than 400 nm is coupled to a Zener diode, and the light-emitting element and the Zener diode coupled to each other are sealed with a metal casing having a window.
    Type: Grant
    Filed: April 10, 2002
    Date of Patent: December 14, 2004
    Assignee: Toyoda Gosei Co., Ltd.
    Inventors: Takemasa Yasukawa, Toshiya Uemura, Hideki Mori
  • Patent number: 6774405
    Abstract: A light-emitting element is mounted in a cup-like portion formed on a substrate and a case. The cup-like portion is filled with a sealing member made of a light-transmissible resin. A layer made of a material having a refractive index lower than that of the sealing member is provided between the sealing member and a surface of the case.
    Type: Grant
    Filed: March 5, 2002
    Date of Patent: August 10, 2004
    Assignees: Toyoda Gosei Co., Ltd., Sanken Electric Co., Ltd.
    Inventors: Takemasa Yasukawa, Hideki Omoya, Satoshi Honda, Koji Tsukagoshi, Tsutomu Yokota
  • Patent number: 6729746
    Abstract: A light source device has a light shielding member having an aperture, a light source arranged on one side of the light shielding member, and a converging member arranged relatively with respect to the light source and the light source to thereby converge light emitted from the light source in the aperture or in a vicinity of the aperture. Another type of light source device has a single light source, and a converging member for converging light from the light source to thereby distribute the light to at least two points. Still another type of light source device has a light source, and a reflecting mirror arranged to enclose a side of a light emission direction of the light source, the reflecting mirror reflecting light emitted from the light source in a direction except the light source so that the light is radiated outside.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: May 4, 2004
    Assignee: Toyoda Gosei Co., Ltd.
    Inventors: Yoshinobu Suehiro, Yuji Takahashi, Takemasa Yasukawa, Hideaki Kato, Hideki Omoya, Hideyuki Nakano, Hisao Yamaguchi
  • Patent number: 6730942
    Abstract: A sealing member for a short-wavelength light emitting element comprises a main agent and a curing agent. The main agent comprises a first component of an alicyclic epoxy produced by hydrogenating an aromatic epoxy, preferably a bisphenol A epoxy, and a second component of an alicyclic epoxy having a lower molecular weight than the first component. The mixing amount of the second component is not less than 10% by weight and less than 30% by weight based on the main agent.
    Type: Grant
    Filed: January 23, 2003
    Date of Patent: May 4, 2004
    Assignee: Toyoda Gosei Co., Ltd.
    Inventors: Akira Mabuchi, Masato Kawamura, Kanae Matsumura, Takemasa Yasukawa
  • Patent number: 6713877
    Abstract: In a light-emitting diode, a substantially square flip chip is placed on a substantially square sub-mount at a position and posture which are obtained through superposition of a center point and center axis of the flip chip on a center point and center axis of the sub-mount and subsequent rotation of the flip chip about the center points by approximately 45°. Therefore, triangular exposed regions are formed on the sub-mount, in which two lead electrodes for the flip chip can be formed. As a result, the flip chip can be placed on a lead frame such that the center axis of the flip chip coincides with the center axis of a parabola of the lead frame. Further, the sub-mount is formed of a semiconductor substrate, and a diode for over-voltage protection is formed within the semiconductor substrate. Therefore, breakage of the light-emitting diode due to excessive voltage can be prevented.
    Type: Grant
    Filed: May 3, 2002
    Date of Patent: March 30, 2004
    Assignees: Toyoda Gosei Co., Ltd., Koha Co., Ltd.
    Inventors: Atsuo Hirano, Yukio Yoshikawa, Kiyotaka Teshima, Takemasa Yasukawa
  • Patent number: 6680490
    Abstract: After a light-emitting element exhibiting an emission peak wavelength in a wavelength range of not longer than 500 nm is mounted into a cup-like portion of a base member, the cup-like portion is filled with epoxy group-containing silicone rubber. An aromatic polyamide-based resin is used as a reflector material.
    Type: Grant
    Filed: June 13, 2002
    Date of Patent: January 20, 2004
    Assignees: Toyoda Gosei Co., Ltd., Sanken Electric Co., Ltd.
    Inventors: Takemasa Yasukawa, Akira Mabuchi, Yasuji Ozaki, Kenichi Watanabe, Satoshi Honda, Tsutomu Yokota
  • Publication number: 20030202349
    Abstract: A light source device has a light shielding member having an aperture, a light source arranged on one side of the light shielding member, and a converging member arranged relatively with respect to the light source and the light source to thereby converge light emitted from the light source in the aperture or in a vicinity of the aperture. Another type of light source device has a single light source, and a converging member for converging light from the light source to thereby distribute the light to at least two points. Still another type of light source device has a light source, and a reflecting mirror arranged to enclose a side of a light emission direction of the light source, the reflecting mirror reflecting light emitted from the light source in a direction except the light source so that the light is radiated outside.
    Type: Application
    Filed: April 25, 2003
    Publication date: October 30, 2003
    Applicant: Toyoda Gosei Co., Ltd.
    Inventors: Yoshinobu Suehiro, Yuji Takahashi, Takemasa Yasukawa, Hideaki Kato, Hideki Omoya, Hideyuki Nakano, Hisao Yamaguchi
  • Publication number: 20030168652
    Abstract: A sealing member for a short-wavelength light emitting element comprises a main agent and a curing agent. The main agent comprises a first component of an alicyclic epoxy produced by hydrogenating an aromatic epoxy, preferably a bisphenol A epoxy, and a second component of an alicyclic epoxy having a lower molecular weight than the first component. The mixing amount of the second component is not less than 10% by weight and less than 30% by weight based on the main agent.
    Type: Application
    Filed: January 23, 2003
    Publication date: September 11, 2003
    Applicant: Toyoda Gosei Co., Ltd.
    Inventors: Akira Mabuchi, Masato Kawamura, Kanae Matsumura, Takemasa Yasukawa
  • Publication number: 20030098460
    Abstract: A group III nitride compound semiconductor light-emitting element of a flip chip bonding type for emitting light with a wavelength not longer than 400 nm is coupled to a Zener diode, and the light-emitting element and the Zener diode coupled to each other are sealed with a metal casing having a window.
    Type: Application
    Filed: April 10, 2002
    Publication date: May 29, 2003
    Inventors: Takemasa Yasukawa, Toshiya Uemura, Hideki Mori
  • Publication number: 20030006421
    Abstract: After a light-emitting element exhibiting an emission peak wavelength in a wavelength range of not longer than 500 nm is mounted into a cup-like portion of a base member, the cup-like portion is filled with epoxy group-containing silicone rubber. An aromatic polyamide-based resin is used as a reflector material.
    Type: Application
    Filed: June 13, 2002
    Publication date: January 9, 2003
    Inventors: Takemasa Yasukawa, Akira Mabuchi, Yasuji Ozaki, Kenichi Watanabe, Satoshi Honda, Tsutomu Yokota
  • Publication number: 20020145205
    Abstract: In a light-emitting diode, a substantially square flip chip is placed on a substantially square sub-mount at a position and posture which are obtained through superposition of a center point and center axis of the flip chip on a center point and center axis of the sub-mount and subsequent rotation of the flip chip about the center points by approximately 45°. Therefore, triangular exposed regions are formed on the sub-mount, in which two lead electrodes for the flip chip can be formed. As a result, the flip chip can be placed on a lead frame such that the center axis of the flip chip coincides with the center axis of a parabola of the lead frame. Further, the sub-mount is formed of a semiconductor substrate, and a diode for over-voltage protection is formed within the semiconductor substrate. Therefore, breakage of the light-emitting diode due to excessive voltage can be prevented.
    Type: Application
    Filed: May 3, 2002
    Publication date: October 10, 2002
    Inventors: Atsuo Hirano, Yukio Yoshikawa, Kiyotaka Teshima, Takemasa Yasukawa
  • Publication number: 20020121645
    Abstract: A light-emitting element is mounted in a cup-like portion formed on a substrate and a case. The cup-like portion is filled with a sealing member made of a light-transmissible resin. A layer made of a material having a refractive index lower than that of the sealing member is provided between the sealing member and a surface of the case.
    Type: Application
    Filed: March 5, 2002
    Publication date: September 5, 2002
    Inventors: Takemasa Yasukawa, Hideki Omoya, Satoshi Honda, Koji Tsukagoshi, Tsutomu Yokota
  • Patent number: 6445011
    Abstract: In a light-emitting diode, a substantially square flip chip is placed on a substantially square sub-mount at a position and posture which are obtained through superposition of a center point and center axis of the flip chip on a center point and center axis of the sub-mount and subsequent rotation of the flip chip about the center points by approximately 45°. Therefore, triangular exposed regions are formed on the sub-mount, in which two lead electrodes for the flip chip can be formed. As a result, the flip chip can be placed on a lead frame such that the center axis of the flip chip coincides with the center axis of a parabola of the lead frame. Further, the sub-mount is formed of a semiconductor substrate, and a diode for over-voltage protection is formed within the semiconductor substrate. Therefore, breakage of the light-emitting diode due to excessive voltage can be prevented.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: September 3, 2002
    Assignees: Toyoda Gosei Co., Ltd., Koha Co., Ltd.
    Inventors: Atsuo Hirano, Yukio Yoshikawa, Kiyotaka Teshima, Takemasa Yasukawa
  • Publication number: 20020024808
    Abstract: A light source device has a light shielding member having an aperture, a light source arranged on one side of the light shielding member, and a converging member arranged relatively with respect to the light source and the light source to thereby converge light emitted from the light source in the aperture or in a vicinity of the aperture. Another type of light source device has a single light source, and a converging member for converging light from the light source to thereby distribute the light to at least two points. Still another type of light source device has a light source, and a reflecting mirror arranged to enclose a side of a light emission direction of thelightsource, the reflecting mirror reflecting light emitted from the light source in a direction except the light source so that the light is radiated outside.
    Type: Application
    Filed: March 14, 2001
    Publication date: February 28, 2002
    Inventors: Yoshinobu Suehiro, Yuji Takahashi, Takemasa Yasukawa, Hideaki Kato, Hideki Omoya, Hideyuki Nakano, Hisao Yamaguchi
  • Patent number: 5949346
    Abstract: An LED display device has an indicator having a housing. The housing has at least one incident portion which receives light from at least one LED. The incident portion has a reflection surface at its inside surface. LEDs emit light from one side or one longitudinal end of the incident portion. A refraction plate may be provided to direct emission of the incident light for viewing by a user.
    Type: Grant
    Filed: June 7, 1996
    Date of Patent: September 7, 1999
    Assignee: Toyoda Gosei Co., Ltd.
    Inventors: Akihiko Suzuki, Makoto Tamaki, Osamu Yamanaka, Tadanobu Iwasa, Hisao Yamaguchi, Kazuhiro Sakai, Takemasa Yasukawa, Akihiro Misawa, Hiroshi Sugihara
  • Patent number: 5815072
    Abstract: A vehicle display device such as a speed meter including indicators, many segments illuminated in two or more colors by plural LEDs and an indicator control circuit. The indicators dispose the segments so as to display a variable such as a car speed in a bar graph or in the form of a number. The indicator control circuit displays the variable by controlling the lighting of the LEDs and changes an emitted light color of indication based on a fixed color changing reference value in accordance with a value of the variable. The control circuit controls a duty ratio of a supply current or a current value in a predetermined set value range determined on the basis of the color changing reference value. Namely, brightness of the emitted light color before a color change is gradually decreased, while brightness of the emitted light color after the color change is gradually increased.
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: September 29, 1998
    Assignee: Toyoda Gosei Co., Ltd.
    Inventors: Osamu Yamanaka, Makoto Tamaki, Takemasa Yasukawa, Hiroshi Sugihara, Kazushi Noda, Yoshio Sano, Tetsuo Tanabe
  • Patent number: 5741058
    Abstract: An LED display device having an LED array for a meter on a printed circuit board. A diffusing radiation lens array is disposed facing the LED array. A cover lens is overlapped on the lens array. The cover lens transmits LED light which passed through the lens array. The cover lens has at least a scale mark, a character and a sign. A sheet is interposed between the lens array and the cover lens. The sheet limits radiation of predetermined diffused light from the lens array while partially transmitting the diffused light. The cover lens has a scale mark dent and a character dent formed on its rear interior surface, and displays the scale mark and character by means of an LED light from another LED array.
    Type: Grant
    Filed: July 31, 1996
    Date of Patent: April 21, 1998
    Assignee: Toyoda Gosei Co., Ltd.
    Inventors: Akihiko Suzuki, Makoto Tamaki, Takemasa Yasukawa, Osamu Yamanaka, Tadanobu Iwasa