Patents by Inventor Yoshifumi Takao

Yoshifumi Takao 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: 20190195457
    Abstract: A lighting device comprising: a light source for emitting lights along optic axis toward field of view; a liquid crystal element disposed on the optic axis, having electrode pattern in far field FF corresponding region and having no electrode pattern in near field corresponding region; a pair of polarizers including input side and output side polarizers sandwiching the liquid crystal element, constituting crossed Nicol polarizers; driver circuit for forming voltages applied to the electrode pattern; and phase shift forming element disposed between the pair of polarizers in the near field corresponding region of the liquid crystal element; wherein the far field corresponding region constitutes normally black optic system together with the pair of polarizers, and the near field corresponding region constitutes normally-on optic system together with the phase shift forming element and the pair of polarizers.
    Type: Application
    Filed: December 21, 2018
    Publication date: June 27, 2019
    Inventors: Yasuo Toko, Yoshifumi Takao, Takashi Sugiyama
  • Publication number: 20190187503
    Abstract: A lighting device includes: a liquid crystal element having electrode pattern including a first portion and a second portion; drive circuit connected to the electrode pattern; polarizer disposed in front of the liquid crystal element and separated from the liquid crystal element in optical axis direction; analyzer disposed at rear of the liquid crystal element, and separated from the liquid crystal element in optical axis direction, wherein the polarizer and the analyzer constitute crossed Nicol polarizers; light source for supplying lights to the liquid crystal element within a predetermined incident angle range; and projection optical system projecting lights transmitted through the liquid crystal element forwardly; wherein the polarizer and the analyzer locally overlap with the liquid crystal element in projection normal to the liquid crystal element, and when the light source is turned on, the drive circuit supplies drive signal to the first portion of the electrode pattern which applies or releases volta
    Type: Application
    Filed: December 19, 2018
    Publication date: June 20, 2019
    Inventors: Yasuo Toko, Yoshifumi Takao
  • Publication number: 20190078749
    Abstract: An automotive headlight includes: a light source for emitting light; a polarization beam splitter for receiving a light flux from the light source, and dividing the light flux into a first polarization and a second polarization; a liquid crystal element disposed to receive the first polarization and the second polarization, divided by the polarization beam splitter; a phase shifter disposed on optical axis of one of the first polarization and the second polarization, and aligning polarization axis directions of the first polarization and the second polarization; and an output side polarizer disposed on output side of the liquid crystal element, wherein illumination regions corresponding to respective control electrodes in the liquid crystal element can be controlled to shield light.
    Type: Application
    Filed: September 8, 2018
    Publication date: March 14, 2019
    Inventors: Yasuo Toko, Ryotaro Owada, Yoshifumi Takao
  • Patent number: 8044591
    Abstract: A fluorescent lamp can be configured to prevent a decrease in luminescent efficiency when located in a high temperature room. The fluorescent lamp can include a couple of stems each including an emitter electrode located opposite to each other at each end of a tube, a filler gas located in the tube, a damping material and a coolest portion connected to the tube via the stem and the damping material. The coolest portion can be configured with a first material that has a higher thermal conductivity than the conductivity of both the tube and the stems. The damping material can be configured with both the first material and a second material that has a lower conductivity than the conductivity of the first material. A content ratio of first material vs. second material can change along a length of the damping material. Thus, the coolest portion can maintain a favorable temperature and the fluorescent lamp can maintain a favorable luminescent efficiency even when in a sealed casing.
    Type: Grant
    Filed: January 12, 2009
    Date of Patent: October 25, 2011
    Assignee: Stanley Electric Co., Ltd.
    Inventors: Yoshifumi Takao, Naoyuki Matsubara
  • Patent number: 7775847
    Abstract: A method for manufacturing a hot cathode fluorescent lamp can ensure or facilitate stable initial luminous intensity and provide improved product life characteristics even when the hot cathode fluorescent lamp employs a glass tube with an outer diameter of less than 7 mm?. One end of a glass tube can be sealed with a glass bead of a mount structure. The other opening end of the glass tube can be welded with an opening end of an exhaust pipe with bent portions of lead wires being sandwiched between the opening ends of the glass tube and the exhaust pipe. After evacuating a vacuum system that is constituted by the inner spaces of the glass tube and the exhausted pipe communicating with each other, the bent portions of the lead wires which extrude outside the vacuum system can be clamp-connected to power source lines extending from an external power source. The emitter of the filaments can be activated by the generated heat of the filament.
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: August 17, 2010
    Assignee: Stanley Electric Co., Ltd.
    Inventors: Naoyuki Matsubara, Masayuki Kanechika, Yoshifumi Takao, Kazuhiro Miyamoto, Toshiyuki Nagahara, Junji Matsuda
  • Publication number: 20090230838
    Abstract: A fluorescent lamp can be configured to prevent a decrease in luminescent efficiency when located in a high temperature room. The fluorescent lamp can include a couple of stems each including an emitter electrode located opposite to each other at each end of a tube, a filler gas located in the tube, a damping material and a coolest portion connected to the tube via the stem and the damping material. The coolest portion can be configured with a first material that has a higher thermal conductivity than the conductivity of both the tube and the stems. The damping material can be configured with both the first material and a second material that has a lower conductivity than the conductivity of the first material. A content ratio of first material vs. second material can change along a length of the damping material. Thus, the coolest portion can maintain a favorable temperature and the fluorescent lamp can maintain a favorable luminescent efficiency even when in a sealed casing.
    Type: Application
    Filed: January 12, 2009
    Publication date: September 17, 2009
    Inventors: YOSHIFUMI TAKAO, Naoyuki Matsubara
  • Publication number: 20080070467
    Abstract: A method for manufacturing a hot cathode fluorescent lamp can ensure or facilitate stable initial luminous intensity and provide improved product life characteristics even when the hot cathode fluorescent lamp employs a glass tube with an outer diameter of less than 7 mm?. One end of a glass tube can be sealed with a glass bead of a mount structure. The other opening end of the glass tube can be welded with an opening end of an exhaust pipe with bent portions of lead wires being sandwiched between the opening ends of the glass tube and the exhaust pipe. After evacuating a vacuum system that is constituted by the inner spaces of the glass tube and the exhausted pipe communicating with each other, the bent portions of the lead wires which extrude outside the vacuum system can be clamp-connected to power source lines extending from an external power source. The emitter of the filaments can be activated by the generated heat of the filament.
    Type: Application
    Filed: September 14, 2007
    Publication date: March 20, 2008
    Inventors: Naoyuki Matsubara, Masayuki Kanechika, Yoshifumi Takao, Kazuhiro Miyamoto, Toshiyuki Nagahara, Junji Matsuda
  • Patent number: 6724145
    Abstract: The invention provides an arc tube with improved chromaticity and start-up characteristics that does not contain mercury, and provides a vehicle headlamp equipped with a metal halide lamp that contains no mercury in the arc tube. Among other improvements, the evaporation of low melting point metal halides is promoted and the start-up characteristics of the arc tube are improved.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: April 20, 2004
    Assignee: Stanley Electric Co., Ltd.
    Inventors: Masaaki Muto, Shigeru Shibayama, Hiroharu Shimada, Isamu Sato, Shinya Omori, Yasuhisa Yaguchi, Naoyuki Matsubara, Yoshifumi Takao, Toshiyuki Nagahara
  • Patent number: 6121729
    Abstract: A metal halide lamp and a method for making the same, in which one end of each electrode projects into a discharge chamber to form a light-emitting portion and the other end thereof is supported by a pinch-sealed portion. A coil is wound around at least the pinch-sealed portion of the electrode to absorb gaseous impurities caused by the heat generated during the operation of the metal halide lamp and to prevent cracking, at the pinch-sealed portion, of bulb. A coil, made of high melting point material and gaseous impurities absorption material, is wound around at least the pinch-sealed portion of the electrode and the combination is disposed into the bulb. The diameter of the coil, the internal diameter of a circle made by the coil, and the pitch of the coil are fixed within specific values in connection with the diameter of the electrode.
    Type: Grant
    Filed: November 3, 1997
    Date of Patent: September 19, 2000
    Assignee: Stanley Electric Co., Ltd.
    Inventors: Yoshifumi Takao, Toshiyuki Nagahara
  • Patent number: 5936350
    Abstract: A metal halide headlamp comprising an electrode and a coil wrapping around said electrode to prevent the occurrence of cracks in a sealing portion, in which the diameter d.sub.0 of said electrode, the cross-section S of said electrode including said coil, the inner diameter ID of said coil, the pitch P of said coil, the distance L between an end of said coil and a metal foil, and the amount of metal halides with a NaI-to-ScI.sub.3 ratio are specifically limited. Thereby, the prior art problems, i.e., changes in the lamp characteristics, the degradation of durability, and so on, can be solved.
    Type: Grant
    Filed: February 4, 1998
    Date of Patent: August 10, 1999
    Assignee: Stanley Electric Co., Ltd.
    Inventors: Mitsunari Yoshida, Yoshifumi Takao, Toshiyuki Nagahara
  • Patent number: 5101991
    Abstract: A nipple (3) for a nursing bottle (1) is made from a soft elastic material, such as plastic. The nipple comprises a front end portion (7) serving as a mouthpiece, a bottle mouth fitting portion (9) to be removably fitted to the opening (5) in the bottle body (2) by a clamping ring (4), and an inverted funnel-shaped intermediate portion (8) disposed intermediate between these portions. A partition wall (11) having a milk sucking hole (12) is integrally formed in the interior.
    Type: Grant
    Filed: August 27, 1990
    Date of Patent: April 7, 1992
    Assignee: Jex Company, Limited
    Inventors: Yasuo Morifuji, Yoshifumi Takao
  • Patent number: 4993568
    Abstract: A nipple (3) for a nursing bottle (1) is made from a soft elastic material, such as plastic. The nipple comprises a front end portion (7) serving as a mouthpiece, a bottle mouth fitting portion (9) to be removably fitted to the opening (5) in the bottle body (2) by a clamping ring (4), and an inverted funnel-shaped intermediate portion (8) disposed intermediate between these portions. A partition wall (11) having a milk sucking hole (12) is integrally formed in the interior.
    Type: Grant
    Filed: September 26, 1989
    Date of Patent: February 19, 1991
    Assignee: JEX Co., Ltd.
    Inventors: Yasuo Morifuji, Yoshifumi Takao