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US 5,061,025 AGranted
Hologon scanner with beam shaping stationary diffraction grating
AssigneeEastman Kodak Company
InventorJohn R. Debesis
Life of this patent
Estimating the term…
Abstract
In a laser scanner of the type having beam shaping means and a stationary diffraction grating for directing the shaped beam to a hologon scanning disc, the beam shaping means is combined with the stationary diffraction grating by providing a shaped stationary diffraction grating, thereby eliminating the need for other beam shaping means prior to the shaped diffraction grating, thereby simplifying construction of the apparatus.
Claims3
Scanning apparatus for scanning a radiation spot along a line at a target, comprising:
- a) a source of coherent radiation;
- b) a hologon mounted for rotation about an axis to scan a beam of radiation incident thereon;
- c) means for forming radiation from the source into a collimated beam;
- d) a shaped stationary diffraction grating for receiving the collimated beam, and directing a portion of the beam having a desired shape onto the hologon at a predetermined angle the shaped diffraction grating having a central portion having a high diffraction efficiency, surrounded by a peripheral portion having a reduced diffraction efficiency;
- e) a target station for receiving the scanned beam;
- and
- f) an f.theta. lens located between the target station and the hologon for focusing the shaped beam to a spot at the target station.
4 more elements
Dependencies are inferred from the claim text.