Apparatus for laser-discharge imaging and focusing elements for

Details Apparatus for laser-discharge imaging and focusing elements for Apparatus for laser-discharge imaging and focusing elements for

1996-02-16

1998-06-09

Tso, Edward

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Light or beam marking apparatus or processes

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B41J 2385

Patent

active

057642745

ABSTRACT:
A focusing assembly includes features that allow numerical aperture to be reduced and optimized by reducing aberrations and ghost reflections and easily controlling stop size, thereby increasing depth-of-focus. The assembly includes a single, bi-aspheric focusing lens that optimizes image quality at a specific off-axis field point. Passage of excessively divergent radiation is prevented by a baffle having a sharp, flared edge that minimizes reflection. A second aperture or baffle can be included to restrict high-divergence radiation emerging from the bi-aspheric focusing lens. All interior surfaces of the focusing assembly are preferably blackened, once again to minimize internal reflections.

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