1
Gunjima Tomoki, Yuki Masanori, Kunigita Masaya, Hirai Yoshinori, Yoshikawa Yukio, Shidoji Eiji: Active matrix liquid crystal display element and projection type active matrix liquid crystal display device.. Asahi Glass, April 11, 1990: EP0362776-A2 (36 worldwide citation)

An active matrix liquid crystal display element and a projection type active matrix liquid crystal display device by which a display can be obtained which is good in color balance and high in brightness and also in contrast ratio. The display element includes a liquid crystal material held between a ...


2
Hirano Atsuo, Yoshikawa Yukio, Teshima Kiyotaka: Light-emitting diode. Toyoda Gosei, Koha, August 23, 2000: EP1030377-A2 (21 worldwide citation)

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 o ...


3
Aoki Kazuo, Yoshikawa Yukio, Ujiie Takekazu: Illuminator. Koha, June 7, 2007: JP2007-142173 (18 worldwide citation)

PROBLEM TO BE SOLVED: To provide an illuminator which can have a small thermal resistance and a high heat radiating effect even when a heat sink or the like is not used, can use a light emitting element in a large current range and cope with an increased output.SOLUTION: The illuminator has a substr ...


4
Hirano Atsuo, Yoshikawa Yukio, Tejima Masataka: Light emitting diode. Toyoda Gosei, Koha, October 13, 2000: JP2000-286457 (13 worldwide citation)

PROBLEM TO BE SOLVED: To unify the distribution of light of a flip chip in the upper and lower parts and in the right and left parts by disposing the flip chip at a specified angle rotated around the central axis, with one side of the flip chip crossing one side of a submount, on the submount having ...


5
Aoki Kazuo, Yoshikawa Yukio, Nishikawa Akihiro, Kawamata Masatoshi, Yamada Tomohiro: Optical element for changing direction of light, light source unit for radiating light, and planar light emitting device employing it. Koha, February 22, 2007: JP2007-048883 (12 worldwide citation)

PROBLEM TO BE SOLVED: To provide an optical element for changing the direction of light in which the occurrence of unevenness in color and light emission can be prevented while using the appropriate number of light sources depending on the scale or demand for lighting without complicating the arrang ...


6
Aoki Kazuo, Yoshikawa Yukio, Nishikawa Akihiro, Kawamata Masatoshi, Nakadai Taro, Yamada Tomohiro: Field light emitting module and field light emitting device using the same. Koha, February 8, 2007: JP2007-036132 (11 worldwide citation)

PROBLEM TO BE SOLVED: To provide a subjacent type field light emitting module capable of easily configuring field light emitting devices of various scales and shapes without changing the design of a drive section in accordance with a power supply capacity and a field light emitting device using the ...


7
Yoshikawa Yukio, Yoshida Toshiyuki, Shima Seiichi: Resin-sealing method of led chip. Koha, November 30, 2001: JP2001-332770 (11 worldwide citation)

PROBLEM TO BE SOLVED: To provide the resin-sealing method of an LED chip that can accurately and easily control the height of the resin-sealing part of the LED chip, can obtain desired light emission luminance without any fluctuation when a resin- sealed LED chip is subjected to light emission, and ...


8
Aoki Kazuo, Yoshikawa Yukio, Nishikawa Akihiro, Kawamata Masatoshi, Yamada Tomohiro: Surface light-emitting device. Koha, November 30, 2006: JP2006-324134 (9 worldwide citation)

PROBLEM TO BE SOLVED: To provide a downright surface light source device capable of restraining color shading or unevenness of light emission by using an appropriate number of light sources in accordance with a scale or request of lighting, without making a structure complicated.SOLUTION: Light is c ...


9
Kawamata Masatoshi, Yoshikawa Yukio: Fitting unit and surface light-emitting device. Koha, July 10, 2008: JP2008-159394 (8 worldwide citation)

PROBLEM TO BE SOLVED: To provide a fitting unit, along with a surface light-emitting device, with which fitting operation of a light source is easy and capable of changing a light emitting area at will to sufficiently suppress occurrence of uneven light emission.SOLUTION: A surface light-emitting de ...


10
Yoshikawa Yukio, Ishii Takeshi, Oyama Yoshihiro, Sasaki Tatsuo, Takahashi Tamotsu, Sato Shinichi, Moriya Kazumasa, Shinoda Ichiro, Itoh Motohiko, Kashiwazaki Tomoyuki, Kawai Hiroaki, Watanabe Mitsuo: Semiconductor laser driving circuit.. Copal, Fujitsu, August 14, 1991: EP0441709-A2 (7 worldwide citation)

A semiconductor laser driving circuit has a semiconductor laser (1) for emitting a laser beam according to a drive power. A photodetector (1b) is provided for effecting photo-electric conversion of the laser beam to output a corresponding electric signal. A monitoring circuit (101) is connected for ...