EP 0103790 A3 19840905 - CODING METHOD FOR AN ELECTRONIC KEY
Title (en)
CODING METHOD FOR AN ELECTRONIC KEY
Publication
Application
Priority
DE 3234538 A 19820917
Abstract (en)
[origin: EP0103790A2] In the method for coding an electronic key, a number of code numbers 1 to n are stored in the transmitter (1) and in the receiver (2). After every transmission and reception operation a new identical code number is automatically set in the transmitter (1) and receiver (2). The transmitter (1) controls via an amplifier (3) a photodiode (4) which emits a coded infrared signal (5). This signal (5) is received by a phototransistor (6) which delivers it to the receiver (2) via an amplifier (7). At the output (8) of the receiver (2) there is a signal (9), by means of which the central locking system of a motor vehicle is actuated. <IMAGE>
IPC 1-7
IPC 8 full level
G07C 9/00 (2006.01)
CPC (source: EP)
G07C 9/00182 (2013.01); G07C 9/00309 (2013.01); G07C 9/21 (2020.01); G07C 2009/00253 (2013.01); G07C 2009/00785 (2013.01); G07C 2209/06 (2013.01)
Citation (search report)
- [A] GB 1595797 A 19810819 - PUSHMAN HUGH JOHN [GB]
- [A] WO 8202811 A1 19820819 - NELSON AVI N [US]
- [A] DE 2922230 A1 19801023 - GYGI MARTIN H
- [A] GB 1582989 A 19810121 - MOTOROLA INC
- [A] IBM TECHNICAL DISCLOSURE BULLETIN, Band 14, Nr. 12, Mai 1972, Seiten 3860-3861, Armonk, New York 10504, US G.V.A. MALMROS: "Access control system"
Designated contracting state (EPC)
DE FR GB SE
DOCDB simple family (publication)
EP 0103790 A2 19840328; EP 0103790 A3 19840905; DE 3234538 A1 19840322
DOCDB simple family (application)
EP 83108588 A 19830831; DE 3234538 A 19820917