Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-08-23
1998-10-13
Negash, Kinfe-Michael
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359110, 359143, 359152, 359187, H04B 1000
Patent
active
058220992
ABSTRACT:
A light communication system employing light, such as infrared rays, in which power consumption required for light communication is diminished for prolonging the service life of portable equipments and for reducing interference or obstruction affecting other spatial light communication operations. A light emitting element 17 in a transmission portion 13 of a first transmission/reception device 10 is controlled in light emission by a light emission driving control circuit 12 and has its light emission intensity adjusted by a light emission intensity adjustment circuit 18 in a light emission drive control circuit 12. The light reception intensity in a light receiving element 27 of a receiving portion 24 of a second transmission/reception device 20 is detected by a reception light intensity detection circuit 28 in a light signal reception processing circuit 25 and sent via a transmission driving control circuit 22 and a transmitting portion 23 so as to be received by a reception portion 14 of the first transmission/reception device 10. The reception light intensity information is taken out by a reception processing circuit 15 and supplied to the light emission intensity adjustment circuit 18. The light emission intensity adjustment circuit 18 is responsive to the reception light intensity information to adjust the light emitting element 17 to a light emission intensity which is of a necessary minimum value to permit stable light communication.
REFERENCES:
patent: 4553268 (1985-11-01), Tilly
patent: 5623355 (1997-04-01), Olsen
Frommer William S.
Negash Kinfe-Michael
Sony Corporation
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