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US 5,309,272 AGranted
Dual pass binary diffractive optical element scanner
AssigneeXerox Corporation
InventorEllis D. Harris
Life of this patent
Estimating the term…
Abstract
An optical scanning system uses a double pass of a light beam through two rotating binary diffractive optical elements on a disc to focus a scan beam at a scan line and to scan the beam along the scan line which doubles the scan angle of the beam.
Claims16
An optical scanner for scanning a light beam along a scan line 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 condition said collimated light beam at said scan line,
- a rotating disc with a first plurality of binary diffractive optical elements and a second plurality of binary diffractive optical elements, said first plurality of binary diffractive optical elements diffracting said collimated, conditioned light beam to focus said light beam at said scan line, and
- reflecting means to direct said light beam from said first plurality of binary diffractive optical elements to said second plurality of binary diffractive optical elements, said second plurality of binary diffractive optical elements diffracting said reflected light beam to scan said light beam along said scan line.
2 more elements
An optical scanner for scanning a light beam along a scan line 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 condition said collimated light beam at said scan line,
- a rotating disc with a first plurality of binary diffractive optical elements and a second plurality of binary diffractive optical elements, said first plurality of binary diffractive optical elements diffracting said collimated, conditioned light beam to focus and scan said light beam at said scan line, and
- reflecting means to direct said light beam from said first plurality of binary diffractive optical elements to said second plurality of binary diffractive optical elements, said second plurality of binary diffractive optical elements diffracting said reflected light beam to scan and focus said light beam along said scan line.
2 more elements
Dependencies are inferred from the claim text.