Title:
OPTICAL TRANSMITTER APPARATUS
Document Type and Number:
WIPO Patent Application WO/2003/049328
Kind Code:
A1
Abstract:
It is an object to prevent a light−emitting diode from keeping emitting a light when the input terminal is fixed to a high−level state due to a software or the like and to avoid various problems, such as battery exhaustion, destruction of the light−emitting diode and the like, from occurring in a PDA, a mobile telephone or the like. The object is accomplished by providing, in the state preceding a light−emitting element driver circuit (23) that drives a light−emitting diode (8) used for optical transmission, a highpass filter (21) that permits passage of the high frequency components of an optical transmission input signal composed of a pulse waveform, and a binarizer circuit (22) that binarizes and returns an output signal from the highpass filter (21) to the pulse waveform.
Inventors:
OHSAWA KATSUICHI (JP)
SHIMAZAKI TOYOYUKI (JP)
CHATO TETSUO (JP)
SHIMIZU YUZO (JP)
IMAIZUMI KENJI (JP)
SHIMAZAKI TOYOYUKI (JP)
CHATO TETSUO (JP)
SHIMIZU YUZO (JP)
IMAIZUMI KENJI (JP)
Application Number:
PCT/JP2002/012464
Publication Date:
June 12, 2003
Filing Date:
November 28, 2002
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
OHSAWA KATSUICHI (JP)
SHIMAZAKI TOYOYUKI (JP)
CHATO TETSUO (JP)
SHIMIZU YUZO (JP)
IMAIZUMI KENJI (JP)
OHSAWA KATSUICHI (JP)
SHIMAZAKI TOYOYUKI (JP)
CHATO TETSUO (JP)
SHIMIZU YUZO (JP)
IMAIZUMI KENJI (JP)
International Classes:
H04B1/04; H04B10/40; H04B10/50; H04B10/524; H04B10/60; (IPC1-7): H04B10/04; H01L33/00
Foreign References:
| JPH10284783A | 1998-10-23 | |||
| JPH1013344A | 1998-01-16 | |||
| JPS60264130A | 1985-12-27 |
Attorney, Agent or Firm:
Miyai, Teruo (7-31 Otemae 1-chome, Chuo-k, Osaka-shi Osaka, JP)
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