Keyless holographic lock
First Claim
1. A keyless angular-invariant holographic lock capable of producing a command signal when a user presents an identification to the lock, wherein for angular invariancy the lock comprises:
- an input element, including a transparent window against which the user presents the identification and rotates it for angular alignment with a prestored identification previously stored in form of a Fourier-hologram;
a matched optical filter upon which the prestored unique identification is stored in the form of said Fourier-hologram;
a coherent light-source for illuminating said identification with a beam at said transparent window;
means for projecting upon said optical matched filter a reflected coherent beam from the window, said reflected coherent beam having been encoded by said identification at the window; and
optical means for registering a correlation signal, wherein the correlation signal is formed during optical comparison of the pre-stored identification with the presented identification during rotation of the presented identification, and for generating the command signal only when the correlation signal is unambiguously present, wherein the correlation signal is a first-stage correlation signal, and further comprising;
a second transparent window upon which the user presents a second identification;
a lid, rotatably attached to said second window and possessing a mirrored layer;
means for pre-storing a second unique identification in said matched optical filter, wherein the matched optical filter is represented in the form of a generalized hologram; and
means for registering a second-stage correlation optical signal formed in the process of comparing the first-stage correlation signal from the matched optical filter with the presented second identification, and for forming the command signal only when the second-stage correlation optical signal is unambiguously present.
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Accused Products
Abstract
A keyless holographic locking device that uses a matched optical filter to store in form of a hologram a unique identificaton such as a fingerprint of an authorized user, a source of coherent light that provides the illumination, and an input element for providing angle-invariance possessing the form of a transparent window against which the user places and rotates the same fingerprint, and a registering device for registering the correlation optical signal between the stored fingerprint and the presented fingerprint to generate a signal to unlock the device when, and only if, a positive correlation exists between the presented and the stored fingerprints. A keyless two-stage holographic locking device, using a generalized matched optical filter wherein additional information for authorization is stored in a reference beam during the preparation of said filter, and wherein a second-stage optical correlation is also performed to register a second correlation between the stored additional information and a second identification presented by the user.
139 Citations
11 Claims
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1. A keyless angular-invariant holographic lock capable of producing a command signal when a user presents an identification to the lock, wherein for angular invariancy the lock comprises:
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an input element, including a transparent window against which the user presents the identification and rotates it for angular alignment with a prestored identification previously stored in form of a Fourier-hologram; a matched optical filter upon which the prestored unique identification is stored in the form of said Fourier-hologram; a coherent light-source for illuminating said identification with a beam at said transparent window; means for projecting upon said optical matched filter a reflected coherent beam from the window, said reflected coherent beam having been encoded by said identification at the window; and optical means for registering a correlation signal, wherein the correlation signal is formed during optical comparison of the pre-stored identification with the presented identification during rotation of the presented identification, and for generating the command signal only when the correlation signal is unambiguously present, wherein the correlation signal is a first-stage correlation signal, and further comprising; a second transparent window upon which the user presents a second identification; a lid, rotatably attached to said second window and possessing a mirrored layer; means for pre-storing a second unique identification in said matched optical filter, wherein the matched optical filter is represented in the form of a generalized hologram; and means for registering a second-stage correlation optical signal formed in the process of comparing the first-stage correlation signal from the matched optical filter with the presented second identification, and for forming the command signal only when the second-stage correlation optical signal is unambiguously present. - View Dependent Claims (2, 3, 4)
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5. A keyless angular-invariant holographic lock capable of producing a command signal when a user presents an identification to the lock, wherein for angular invariancy the lock comprises:
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an input element, including a transparent window against which the user presents the identification and rotates if for angular alignment with a prestored identification previously stored in form of a Fourier-hologram; a matched optical filter upon which the prestored unique identification is stored in the form of said Fourier-hologram; a coherent light-source for illuminating said identification with a beam at said transparent window; means for projecting upon said optical matched filter a reflected coherent beam from the window, said reflected coherent beam having been encoded by said identification at the window; and optical means for registering a correlation signal, wherein the correlation signal is formed during optical comparison of the pre-stored identification with the presented identification during rotation of the presented identification, and for generating the command signal only when the correlation signal is unambiguously present, wherein the correlation signal is a first-stage correlation signal, and wherein the matched optical filter is produced in the form of a generalized hologram in which a second unique identification is pre-stored, and further comprising; a second transparent window upon which the user presents a second identification; a lid, rotatably attached to the second window and possessing a mirrored layer; and means for registering a second-stage correlation optical signal formed in the process of comparing the first-stage correlation signal from the matched optical filter with the presented second identification, and for forming the command signal only when the second-stage correlation optical signal is unambiguously present. - View Dependent Claims (6, 7, 8, 9)
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10. A method of activating a locking device, comprising the steps of:
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storing a unique identification in the form of a Fourier hologram indicative of a person authorized to activate said device, presenting an identification to a transparent window and varying the angular orientation of the identification as it is presented, reflecting a beam from the window during variation of the identification'"'"'s angular orientation, so that the reflected beam is encoded by said presented identification and the reflected beam is projected onto the Fourier hologram, continuously in time comparing said reflected beam optically with said hologram, and generating a command signal when an optical correlation signal is present between the presented identification and said Fourier hologram, further comprising the steps of; encoding a reference beam with the unique identification and with a second identification, and directing said encoded reference beam to a self-developing medium, thus forming a generalized matched optical filter in which the unique identification and the second identification are holographically stored; and illuminating a second transparent window with the optical correlation signal, but only in the case that the optical correlation signal is present, wherein the optical correlation signal is an optical signal which reconstructs the stored second identification. - View Dependent Claims (11)
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Specification