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US 6,648,483 B1Granted
Concave mirror optical system for scanner
AssigneeUmax Data Systems Inc.
InventorShih-Zheng Kuo
Life of this patent
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Abstract
A concave mirror optical system for a scanner and a method for compensating image distortion. In this invention, the more expensive lens assembly in a conventional optical system is replaced by a concave mirror made from simple low-cost material so that production cost and chromatic dispersion are reduced. Moreover, different magnifications can be obtained due to a difference in focusing power of the concave mirror along XY axis direction.
Claims6
A concave mirror optical system for a scanner, comprising:
- a first concave mirror having a first surface for receiving a beam of incoming light;
- a second concave mirror having a first surface for receiving the reflected light from the first concave mirror;
- a third concave mirror having a first surface for receiving the reflected light from the second concave mirror and focusing the reflected light to a focal point;
- and
- an optical sensor whose receiving end is positioned at the focal point for receiving light reflected from the third concave mirror.
2 more elements
Dependencies are inferred from the claim text.