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US 5,859,715 AGranted
Diffractive laser scanner
AssigneeEastman Kodak Company
InventorsMark M. Meyers, Badhri Narayan
Life of this patent
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Abstract
A scanner (40) is disclosed which includes a source of coherent light (12), a radial holographic deflector (16), a F.theta. lens (62), which images a scanned spot onto an image plane (18). The F.theta. lens (62) is comprised of a decentered aspheric mirror (64) and a diffractive--refractive toroidal lens (66). The apparatus is relatively insensitive to variations in the wavelength of the source of coherent light.
Claims8
A scanning apparatus for providing a substantially straight line scan of a radiation spot with a selected shape and orientation comprising:
- a source of coherent radiation;
- a holographic deflector for creating a scanned beam from said source of coherent radiation, mounted for rotation about an axis and having at least one pattern of substantially parallel grating lines;
- a collimating lens, located between said source of coherent radiation and said holographic deflector;
- a cylinder lens located between said collimating lens and said holographic deflector for forming a line image on a facet of said holographic deflector;
- an image plane for receiving the scanned beam;
- a diffractive--refractive lens which is primarily diffractive in a scan direction and primarily refractive in a page direction, located between the holographic deflector and the image plane for focusing the scanned beam to a spot at the image plane;
- and
- a mirror between the holographic deflector and the diffractive--refractive lens for maintaining spot size and scan linearity.
5 more elements
Dependencies are inferred from the claim text.