Optical system of optical information recording/ reproducing app

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

1995-09-14

1997-08-12

Phan, James

Optical: systems and elements

Lens

Including a nonspherical surface

359618, 359717, 359793, 359796, 369 4439, 369112, G02B 302

Patent

active

056571682

ABSTRACT:
An 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 is provided. The objective optical system can comprise a hologram lens or can have both surfaces formed as convex aspherical surfaces. A chromatic aberration correcting element having almost no power is adapted to correct chromatic aberration of the objective lens. 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 can 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: 4927247 (1990-05-01), Tanaka et al.
patent: 4976526 (1990-12-01), Oshima et al.
"Single Lens CD Player Pickup System Using a Bio-aspheric Molded Glass Lens" (Sunohara et al., I.E.E.E. Transactions on Consumer Electronics, vol. CE-33, No. 4, pp. 520-530, Nov. 1987, New York, NY).

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