Remote control apparatus with selectable RF and optical signal t

Communications: electrical – Continuously variable indicating – With meter reading

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Details

340825720, 340825690, 455603, H04Q 700

Patent

active

049049933

ABSTRACT:
A communication apparatus for a remote control apparatus, for example, in order to lock or unlock doors or a trunk of a vehicle selects a radio signal or optical signal in accordance with the conditions between the transmitter and receiver. Its transmitter is provided with a radio signal sending circuit, an optical signal sending circuit and a selection circuit which selects any one circuit for operation and a receiver which is provided with a radio signal receiving circuit which receives a radio signal transmitted from said radio signal sending circuit and an optical signal receiving circuit which receives an optical signal transmitted from said optical signal sending circuit.

REFERENCES:
patent: 3112486 (1963-11-01), Adler
patent: 3513443 (1970-05-01), Andersen
patent: 3590271 (1971-06-01), Peters
patent: 4412218 (1983-10-01), Niitsu
patent: 4415065 (1983-11-01), Sandstedt
patent: 4422071 (1983-12-01), de Graaf
patent: 4509093 (1985-04-01), Stellberger
patent: 4531115 (1985-07-01), Black et al.
patent: 4539710 (1985-09-01), Dinsmore

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