Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1996-11-08
1998-10-06
Font, Frank G.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359641, G02B 2714, G02B 2730
Patent
active
058186433
ABSTRACT:
An objective lens system of a quite simple construction with fewer lenses cyomplying with a continuous variation in thickness of the disk. The system records and reproduces information on a high-density and mass storage optical information medium while providing excellent performance. The system comprises a single positive lens element, a positive objective lens element and a disk arranged in that sequence from the side of a light source, in which the single positive lens is moved on an optical axis to improve the aberration that has increased as a result of a variation in thickness of the disk and the objective lens is moved by a slight distance on the optical axis to be in-focus state in response to the movement of the image point resulting from the variation in the thickness of the disk.
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Font Frank G.
Mahk Co., Ltd.
Stafira Michael P.
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