Security systems
AssigneeChubb & Son's Lock and Safe Company Limited
InventorJohn Hadley
Life of this patent
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Abstract
A door security system includes a lock that is released by an electronic control unit carried on the door and activated by radiation from an r.f. oscillator in a user's key unit. The key unit, provided on a finger ring, includes one or more photovoltaic devices that convert light energy received from a lamp on the door to electrical power for the r.f. oscillator. The r.f. emission may be binary-code modulated and the control unit then includes an appropriate modulation-code detector. The door unit may also include a light-source that emits coded pulses of infra-red light and then the key unit includes a circuit to detect whether the infra-red light received is of the appropriate code-format as a condition for activation of the r.f. oscillator.
Claims9
A security system comprising:
- light-source means;
- key means for responding to light emitted by said light-source means, said key means including oscillator means adapted to be powered electrically to emit electromagnetic radiation, means for converting light energy received from said light-source means to electrical energy, and means for supplying said electrical energy to power said oscillator means to emit said electromagnetic radiation;
- and receiver means for receiving electromagnetic radiation emitted by said oscillator means, said receiver means including means responsive to the said received electromagnetic radiation to provide manifestation thereof.
A security system for controlling operation of a release device in accordance with selectively presentable key means comprising:
- light-source means, said light-source means including means for emitting light having a characteristic modulation;
- key means that is selectively presentable to said light-source means in said system for responding to light emitted by said light-source means, said key means including modulation-detection means for detecting the existence of said modulation in light received by said key means, and means for emitting a control signal in dependence upon detection of said modulation by said modulation-detection means;
- and means responsive to emission of said control signal by said key means to operate said release device.
Dependencies are inferred from the claim text.