Optical key security access system
First Claim
Patent Images
1. A new and improved optical key security access system comprising:
- photo-sensitive means for receiving and detecting at least one light beam, said photo-sensitive means comprising a two-dimensional imaging array;
illumination means for sending at least one light beam to said imaging array; and
key means positionable between said illumination means and said imaging array, said key means including an integral material through which said at least one light beam passes, said integral material serving to reorient said at least one light beam whereby said integral material causes said light beam to impinge upon a preselected portion of said imaging array, said integral material comprising optically transmissive gradient refractive index material for reorienting said at least one light beam to impinge upon a preselected portion of said imaging array, and signal processing means responsive to the output of said imaging array to compare a signal representing said preselected portion of said imaging array with a predetermined encoded signal.
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Abstract
An access security system employs a non-duplicatable key made from an optically transmissive material having gradient refractive index and diffusive properties which provide the material with a non-duplicatable quality. The system provides a high level of security comparable to many biometric systems and is well suited for use in the prevention of unauthorized access to high security areas.
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Citations
5 Claims
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1. A new and improved optical key security access system comprising:
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photo-sensitive means for receiving and detecting at least one light beam, said photo-sensitive means comprising a two-dimensional imaging array; illumination means for sending at least one light beam to said imaging array; and key means positionable between said illumination means and said imaging array, said key means including an integral material through which said at least one light beam passes, said integral material serving to reorient said at least one light beam whereby said integral material causes said light beam to impinge upon a preselected portion of said imaging array, said integral material comprising optically transmissive gradient refractive index material for reorienting said at least one light beam to impinge upon a preselected portion of said imaging array, and signal processing means responsive to the output of said imaging array to compare a signal representing said preselected portion of said imaging array with a predetermined encoded signal. - View Dependent Claims (2, 3, 4, 5)
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Specification