Optical system of optical information recording/reproducing appa

Details Optical system of optical information recording/reproducing appa Optical system of optical information recording/reproducing appa

1995-09-14

1997-06-10

Phan, James

Optical: systems and elements

Lens

Multiple component lenses

369 4439, 369112, 359794, G02B 904

Patent

active

056382219

ABSTRACT:
An objective optical system of an optical information recording/reproducing apparatus includes a light source for emitting a generally parallel luminous flux, an objective optical system for converging the luminous flux emitted from the light source portion onto a medium and a chromatic aberration correcting element for correcting a chromatic aberration of the objective lens. The chromatic aberration correcting element is formed of three lens cemented together. A first lens and a third lens of the chromatic aberration correcting element have a same polarity power while a second lens has a different power from that of the first and third lenses. Incident and outgoing end faces of the chromatic aberration correcting element are formed as generally plane surfaces. A mechanism for independently actuating the objective lens at least in an optical axis direction is provided. Further, a beam splitter for splitting the luminous flux reflected by the medium from a light path directed to the light source portion and guiding the luminous flux to a light receiving system may also be provided.

REFERENCES:
patent: 4484803 (1984-11-01), Arai
patent: 4557564 (1985-12-01), Rosemalen
patent: 4572623 (1986-02-01), Tanaka et al.
patent: 4721373 (1988-01-01), Sugiyama
patent: 4753524 (1988-06-01), Sugiyama
patent: 4791265 (1988-12-01), Nakamura
patent: 4909616 (1990-03-01), Arai
patent: 4976526 (1990-12-01), Oshima et al.

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