Security systems
First Claim
1. 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.
0 Assignments
0 Petitions
Accused Products
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.
-
Citations
9 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5)
- light-source means;
-
6. 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. - View Dependent Claims (7, 8, 9)
- light-source means, said light-source means including means for emitting light having a characteristic modulation;
Specification