Abstract: A security system which employs an optical key shape reader to photoelectrically derive an electrical signal from a shape characteristic of a key is disclosed. The system provides heightened security over standard key operated systems and is particularly well suited for use in motor vehicles.

Abstract: A device for preventing an operator of a vehicle from locking an ignition key in the vehicle includes a key-in-ignition sensor switch, an open-door sensor switch, and a power door lock sensor switch. A logic circuit outputs a pulse to activate a power door unlocking circuit and an audible alarm whenever the three sensor switches indicate that the key is in the ignition, the door is open, and the power door lock switch has been pressed.

Abstract: An apparatus and method for providing a universal electronic locking system (UELS) which controls an actuating device for a lock is disclosed. The system is composed of two elements, a signal-transmitting unit and a signal-receiving unit. The signal transmitting unit transmits one or more encoded signals on electromagnetic carriers. An integrated circuit includes a programmable memory unit such that various codes may be entered and the codes may be changed at any interval desired by the operator. The signal-receiving unit comprises a means for receiving the encoded signals from the signal-transmitting unit and contains a programmable memory unit which is responsive to each and all codes contained in the signal-transmitting unit. Upon changing the code signal in the signal-transmitting unit, the memory unit of the signal-receiving unit may be reprogrammed so as to be responsive to the newly encoded signal and allow the latching mechanism of the lock system to be operated.

Abstract: Apparatus for transmitting optical signals from an unprotected environment to a protected environment are disclosed. The apparatus may take the form of a lightpipe which has a light transmitting core and a cladding material surrounding the core having an index of refraction lower than the core. The lightpipe is aligned with a photodetector by means of a retaining collar. An omnidirectional optical signal collector is also disclosed for receiving optical signals from any direction and relaying them to a secure photodetector.

Abstract: A security system which employs an optical key shaped reader to photoelectrically derive an electrical signal from a shape characteristic of a key is disclosed. The system provides heightened security over standard key operated systems and is particularly well suited for use in motor vehicles.