Lens device comprising light blocking means and an optical picku

Details Lens device comprising light blocking means and an optical picku Lens device comprising light blocking means and an optical picku

1996-05-01

1997-09-09

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

359719, 359721, 369 4424, 369118, G01S 120, H01J 314, G11B 700

Patent

active

056659571

ABSTRACT:
A lens device which can be used as an objective lens in an optical pickup apparatus includes an objective lens provided along a light path facing a disc and having a predetermined effective diameter, and light controlling means provided along the light path for controlling the light in an intermediate region between near and far axes of an incident light beam, thus providing a simplified and inexpensive device for using discs of differing thickness in a single disc drive, by reducing the spherical aberration effect.

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Y. Komma et al., "Dual Focus Optical head for 0.6 mm and 1.2 mm Disks," Optical Review, vol. 1, No. 1, 1994, pp. 27-29. (Jan. 1994).

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