Communications: electrical – Continuously variable indicating – With meter reading
Patent
1983-04-01
1985-10-22
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082554, 361172, H04Q 900, E05B 4900
Patent
active
045491763
ABSTRACT:
Device for identifying an information, particularly of an access control consisting of electronic lock and key part, wherein given approach of the key part toward the lock part, its oscillator part oscillates at a high frequency, the oscillation is picked up by the key part and, modulated with a frequency or pulse pattern serving as a key identifier, is transmitted back to the lock part and is further processed by the reception and recognition means at the lock side. The reciprocating transmission of the energy between the lock and key part is carried out by a wave coupling by means of antenna coils whereby an inductively coupled synchronization switch is produced in that an altered signal curve is produced at a first coil at the lock side, being produced, for example, by means of a more or less complete short at a second coil at the key side or by means of impressing energy on the second coil.
REFERENCES:
patent: 3440633 (1969-04-01), Vinding
patent: 3714419 (1973-01-01), Fosse et al.
patent: 3721830 (1973-03-01), Oishi et al.
patent: 4328482 (1982-05-01), Belcher et al.
patent: 4371867 (1983-02-01), Gander
patent: 4388524 (1983-06-01), Walton
Angewandte Digital Elektronik GmbH
Yusko Donald J.
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