Exposure head

Optical waveguides – Directional optical modulation within an optical waveguide

Reexamination Certificate

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C385S040000, C359S197100, C359S204200

Reexamination Certificate

active

06928198

ABSTRACT:
The present invention provides, in order to obtain a desired focal depth t in a range α of an acceptable increased amount of beam diameter, an exposure head is designed so that the ratio D/W of an output beam width D to a beam width W at the position where a digital micromirror device (DMD) is placed satisfies the following formula:DW≤α×M2×t-K×λaθ.

REFERENCES:
patent: 6034378 (2000-03-01), Shiraishi
patent: 6535271 (2003-03-01), Ogasawara
patent: 6542178 (2003-04-01), Miyagawa et al.
patent: 6717106 (2004-04-01), Nagano et al.
patent: 6768505 (2004-07-01), Zelenka
patent: 6832045 (2004-12-01), Nakaya et al.

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