Rotating disc optical synchronization system using binary diffractive optical elements
First Claim
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1. An optical synchronization system for a rotating disc comprising:
- a light source for emitting a coherent light beam,means to collimate said coherent light beam,a first stationary binary diffractive optical element to alternately block and diffract said collimated light beam,a plurality of alternating second binary diffractive optical elements and blocking elements disposed circumferentially on said rotating disc such that said diffracted light beam from said first stationary binary diffractive optical element is alternately blocked by said alternating blocking elements and diffracted by said alternating second binary diffractive optical elements as said rotating disc rotates,reflecting means to reflect said diffracted light beam from said second binary diffractive optical elements on said rotating disc, such that said reflected light beam is alternately blocked by said alternating blocking elements and diffracted by said alternating second binary diffractive optical elements on said rotating disc as said rotating disc rotates, and said diffracted reflected light beam is alternately blocked and diffracted by said first stationary binary diffractive optical element, andfocussing means to focus said double diffracted, reflected light beam onto a photodetector to generate a synchronization signal for rotation of said rotating disc.
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Abstract
An optical synchronization system uses a stationary binary diffractive optical element and a rotating disc with alternating binary diffractive optical elements and blocking elements to create a moire pattern of a synchronization signal for a pixel clock.
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Citations
10 Claims
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1. An optical synchronization system for a rotating disc comprising:
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a light source for emitting a coherent light beam, means to collimate said coherent light beam, a first stationary binary diffractive optical element to alternately block and diffract said collimated light beam, a plurality of alternating second binary diffractive optical elements and blocking elements disposed circumferentially on said rotating disc such that said diffracted light beam from said first stationary binary diffractive optical element is alternately blocked by said alternating blocking elements and diffracted by said alternating second binary diffractive optical elements as said rotating disc rotates, reflecting means to reflect said diffracted light beam from said second binary diffractive optical elements on said rotating disc, such that said reflected light beam is alternately blocked by said alternating blocking elements and diffracted by said alternating second binary diffractive optical elements on said rotating disc as said rotating disc rotates, and said diffracted reflected light beam is alternately blocked and diffracted by said first stationary binary diffractive optical element, and focussing means to focus said double diffracted, reflected light beam onto a photodetector to generate a synchronization signal for rotation of said rotating disc. - View Dependent Claims (2, 3)
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4. An optical synchronization system for a rotating disc comprising:
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a light source for emitting a coherent light beam, means to collimate said coherent light beam, a plurality of alternating first binary diffractive optical elements and blocking elements disposed circumferentially on said rotating disc such that said collimated light beam is alternately blocked by said alternating blocking elements and diffracted by said alternating first binary diffractive optical elements as said rotating disc rotates, a second stationary binary diffractive optical element to alternately block and diffract said diffracted light beam from said first binary diffractive optical elements, reflecting means to reflect said diffracted light beam from said second stationary binary diffractive optical element, such that said reflected light beam is alternately blocked and diffracted by said second stationary binary diffractive optical element, and said diffracted reflected light beam is alternately blocked by said alternating blocking elements and diffracted by said alternating first binary diffractive optical element on said rotating disc as said rotating disc rotates, and focussing means to focus said double diffracted, reflected light beam onto a photodetector to generate a synchronization signal for rotation of said rotating disc. - View Dependent Claims (5, 6)
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7. An optical synchronization system for a rotating disc comprising:
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a light source for emitting a coherent light beam, means to collimate said coherent light beam, a first stationary binary diffractive optical element to alternately block and diffract said collimated light beam, a plurality of alternating second binary diffractive optical elements and blocking elements disposed circumferentially on said rotating disc such that said diffracted light beam from said first stationary binary diffractive optical element is alternately blocked by said alternating blocking elements and diffracted by said alternating second binary diffractive optical elements as said rotating disc rotates, and focussing means to focus said double diffracted light beam from said plurality of alternating second binary diffractive optical elements onto a photodetector to generate a synchronization signal for rotation of said rotating disc. - View Dependent Claims (8)
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9. An optical synchronization system for a rotating disc comprising:
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a light source for emitting a coherent light beam, means to collimate said coherent light beam, a plurality of alternating first binary diffractive optical elements and blocking elements disposed circumferentially on said rotating disc such that said collimated light beam is alternately blocked by said alternating blocking elements and diffracted by said alternating first binary diffractive optical elements as said rotating disc rotates, a second stationary binary diffractive optical element to alternately block and diffract said diffracted light beam from said first binary diffractive optical elements, and focussing means to focus said double diffracted light beam from said second stationary binary diffractive optical element onto a photodetector to generate a synchronization signal for rotation of said rotating disc. - View Dependent Claims (10)
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Specification