Seiko Epson Corporation

Teruyasu Hama

Tadashi Aizawa

Shojiro Kitamura

Tsugio Ide

Takeshi Nakajima

This invention provides an optical transmitter in which reduced power consumption is achieved by, when a signal generator needs data transmission, driving a laser emitting device to perform emission. An optical transmitter includes a receiver, a laser driving circuit, a light emitting unit constituted by a plurality of laser emitting devices, and an EDID memory. The receiver and the laser driving circuit are supplied with power from a dedicated external power supply through a power-supply line, and the power-supply line is provided with a switch. The contact of the switch is controlled to open and close based on a power-supply voltage supplied from the DDC controller to the EDID memory.

Optical transmitter

A GPS reception system is provided in which, when sufficient reception level for positioning cannot be obtained only by a built-in antenna, a reception antenna is switched from the built-in antenna to an external antenna.

Growing community of inventors

Suwa, Japan

Teruyasu Hama