Sharp Kabushiki Kaisha Corporation

Masahiko Kimoto

Takahiro Funakoshi

Yasuhiro Wada

Hitoshi Azuma

Terukazu Ohtsuki

Hiroshi Minematsu

Nobuyuki Tominaga

Masumi Nakamichi

Tetsuya Hanamoto

Yoichi Tsuda

Takehiro Yamamoto

Shohichi Kato

Shoichi Kondo

A plane-shaped lighting device has a light-directing plate and a light source that is placed in contact with or in the proximity of the light-incident surface of the light-directing plate, and the light source is constituted of a plurality of LED lamps each of which has an LED chip for emitting light and a semispherical lens for directing the light from the LED chip into the light-directing plate. Here, the distance from the LED chip to the top of the semispherical lens is set to be 1.8 times as long as the radius of curvature of the semispherical lens. This arrangement allows the light emitted from the LED chip to be efficiently incident on the light-incident surface of the light-directing plate, thereby improving the light-incidence efficiency to the light-directing plate. Further, the application of this plane-shaped lighting device to display devices makes it possible to improve the efficiency of light utilization, and consequently to provide thinner display devices with high visibility.

Plane-shaped lighting device and a display using such a device

There is provided an inexpensive light emitting display device which has a simple wiring structure and produces a bright screen display. A photo-transistor is connected in series with a light emitting diode. The photo-transistor is arranged so that light emitted from the light emitting diode enters into the photo-transistor. There is provided an optical guide for guiding a data signal light to the photo-transistor and an optical guide for guiding a scanning signal light to the phototransistor. Further, an optical control section has a laser diode array, a lens array, and a deflection mirror. The above-mentioned arrangement obviates the need of an electric wiring for a data signal and a scanning signal, and is able to turn on the photo-transistor with the emission light from the light emitting diode and makes the photo-transistor self-hold its conductive state.

Light emitting display device having light receiving element for

A reflective type photointerrupter including: a resin case formed with a light emitting chip mounting recess and a light receiving chip mounting recess; a metallic deposit wiring formed in the recesses; and a light emitting chip and a light receiving chip respectively mounted on the light emitting chip mounting recess and the light receiving chip mounting recess and sealed with a resin material; the recesses being arranged in side-by-side relation and partitioned by an intermediate wall.

Reflective type photointerrupter

Growing community of inventors

Ikoma, Japan

Masahiko Kimoto