Opto-electronic key control of security lock - contains sections of optical fibres which align with electronic gating circuits

摘要

An optoelectronic key generates a combination of logic signals to operate a lock. The key does not wear since there is no contact and it is not affected by parasitic or magnetic radiations in an industrial environment. An optoelectronic key (1) contains sections of optical fibres (15,16) so that radiation from a lamp(10) may be connected via a number of optical fibres (c) in the lock housing (3) to three photoelectric detectors (11,12,13). These are connected optically to the key by optical fibres (A,B,C) in the wall of the lock housing. The detector outputs are connected to an AND gate (14) which produces an output (5) if the key is correctly inserted. A claw (17) on the key operates a pushbutton switch (18) to power the lamp and detector circuits.