Rotating disc optical synchronization system using alternating binary diffractive optical elements
First Claim
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1. An optical synchronization system for a scanning system on a rotating disc comprising:
- a light source for emitting a coherent light beam,means to collimate said coherent light beam,scanning elements disposed on said rotating disc,a continuous plurality of alternating first binary diffractive optical elements and second binary diffractive optical elements disposed circumferentially on said rotating disc, said continuous plurality of first binary diffractive optical elements and second binary diffractive optical elements being separate from said scanning elements, such that said collimated light beam is alternately diffracted and focussed by said first binary diffractive optical elements onto a first photodetector and diffracted and focussed by said second binary diffractive optical elements onto a second photodetector, said first photodetector and said second photodetector generating a continuous synchronization signal for rotation of said rotating disc.
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Abstract
An optical synchronization system uses a rotating disc with alternating binary diffractive optical elements for a synchronization signal for a pixel clock.
12 Citations
5 Claims
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1. An optical synchronization system for a scanning system on a rotating disc comprising:
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a light source for emitting a coherent light beam, means to collimate said coherent light beam, scanning elements disposed on said rotating disc, a continuous plurality of alternating first binary diffractive optical elements and second binary diffractive optical elements disposed circumferentially on said rotating disc, said continuous plurality of first binary diffractive optical elements and second binary diffractive optical elements being separate from said scanning elements, such that said collimated light beam is alternately diffracted and focussed by said first binary diffractive optical elements onto a first photodetector and diffracted and focussed by said second binary diffractive optical elements onto a second photodetector, said first photodetector and said second photodetector generating a continuous synchronization signal for rotation of said rotating disc. - View Dependent Claims (2, 3)
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4. An optical synchronization system for a scanning system on 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 binary diffractive optical elements and blocking elements disposed circumferentially on said rotating disc such that said collimated light beam is alternately diffracted and focussed by said binary diffractive optical elements onto a first photodetector and blocked by said blocking elements to generate a synchronization signal for rotation of said rotating disc.
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5. An optical synchronization system for a scanning system on a rotating disc comprising:
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a light source for emitting a coherent light beam, means to collimate said coherent light beam, scanning elements disposed on said rotating disc, a continuous plurality of alternating first binary diffractive optical elements and second binary diffractive optical elements and third binary diffractive optical elements with equal numbers of said first and second binary diffractive optical elements and fewer of said third binary diffractive optical elements, said first, second and third binary diffractive optical elements disposed circumferentially on said rotating disc, said continuous plurality of first, second and third binary diffractive optical elements being separate from said scanning elements, such that said collimated light beam is alternately diffracted and focussed by said first binary diffractive optical elements onto a first photodetector, diffracted and focussed by said second binary diffractive optical elements onto a second photodetector, and diffracted and focussed by said third binary diffractive optical elements onto a third photodetector, said first photodetector, said second photodetector, and said photodetector generating a continuous synchronization signal for rotation of said rotating disc.
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Current AssigneeXerox Corporation (Xerox Holdings Corp.)
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Original AssigneeXerox Corporation (Xerox Holdings Corp.)
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InventorsHarris, Ellis D.
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Primary Examiner(s)Lerner, Martin
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Application NumberUS08/155,348Time in Patent Office253 DaysField of Search359/17, 359/18, 359/565, 359/566, 359/569, 359/209, 359/210, 235/457US Class Current359/209.1CPC Class CodesG02B 5/1809 with pitch less than or com...
