Optical system for collimating elliptical light beam and...

Details Optical system for collimating elliptical light beam and... Optical system for collimating elliptical light beam and...

2011-04-12

2011-04-12

Tran, Thang V (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

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07924687

ABSTRACT:
An optical system (20) for efficiently collimating an elliptical light beam includes a light source (21), a first lens (22), a second lens (23), and a third lens (24). The light source is adapted for providing an elliptical light beam defining different diverging angles in different directions, wherein any cross-section of the elliptical light beam emitted from the light source defines a long axis and a short axis which are perpendicular to each other. The first lens, the second lens, and the third lens are used for reconfiguring the elliptical light beam, thus obtaining a round light beam having equivalent short axis and long axis, and equivalent diverging angles in both horizontal direction and vertical direction. Optical centers of the first lens, the second lens, and the third lens commonly define a common optical axis along which the elliptical light beams travels.

REFERENCES:
patent: 5155714 (1992-10-01), Inoue
patent: 5237451 (1993-08-01), Saxe
patent: 5251060 (1993-10-01), Uenishi et al.
patent: 5486694 (1996-01-01), Harris
patent: 2004/0085884 (2004-05-01), Kimura
patent: 591631 (2004-06-01), None

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