Optical scanning device and optical apparatus for reading and/or

Details Optical scanning device and optical apparatus for reading and/or Optical scanning device and optical apparatus for reading and/or

1999-08-06

2000-10-31

Epps, Georgia

Optical: systems and elements

Collimating of light beam

359650, 359651, 359642, G02B 2730, G02B 300

Patent

active

061411531

ABSTRACT:
An optical device for optically scanning an information plane includes a radiation source for supplying a scanning beam, and an objective system for focusing the scanning beam to a scanning spot on the information plane. The temperature dependence of the objective system can be compensated by a compensator which includes a planoconvex first element and a planoconcave second element arranged between the radiation source and the first element, the convex surface of the first element confronting the concave surface of the second element, and the refractive indices of the first and the second element being equal at the design temperature but having a different temperature dependence.

REFERENCES:
patent: 4721373 (1988-01-01), Sugiyama
patent: 4753524 (1988-06-01), Sugiyama
patent: 5638221 (1997-06-01), Maruyama et al.
patent: 5991102 (1999-11-01), Oono

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