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

1997-08-12

Phan, James

Optical: systems and elements

Lens

Multiple component lenses

359618, 359796, 369 4439, 369112, G02B 904

Patent

active

056571712

ABSTRACT:
An optical system of an optical information recording/reproducing apparatus including a light source, an objective lens, and a chromatic aberration correcting element is provided and also includes a mechanism for independently actuating the objective lens. A beam splitter for splitting the luminous flux reflected by a medium can also be provided. The chromatic aberration correcting element is formed of a positive lens and a negative lens cemented together and satisfies the relation .vertline.n.sub.p -n.sub.n .vertline..times.10.sup.-5 <300, wherein the refractive index in a central wavelength in use of the positive lens is represented by n.sub.p and the refractive index of the negative lens is represented by n.sub.n.

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"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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