Apparatus and method for compensating coma aberration

Details Apparatus and method for compensating coma aberration Apparatus and method for compensating coma aberration

1996-12-10

1998-03-10

Westin, Edward

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4423, 359637, 359719, G02B 302, G11B 700

Patent

active

057264368

ABSTRACT:
An optical pick-up apparatus includes a light source, an objective lens, a beam splitter, a detector, a first optical compensating device and a second optical compensating device. The objective lens converges a light beam emitted from the light source at one point on an optical axis. The beam splitter separates the light beam emitted from the light source from a returning light reflected on an optical disc. The detector detects the returning light separated from the light beam emitted from the light source. The first optical compensating device has a convex aspherical surface represented by X.alpha.R.sup.4 and is located on an optical path where the light beam is emitted from the light source. The second optical compensating device has a concave aspherical surface represented by +.alpha.R.sup.4 and is located on an optical path where the light beam is emitted from the light source.

REFERENCES:
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patent: 4641929 (1987-02-01), Braat
patent: 4820029 (1989-04-01), Iwai et al.
patent: 4968874 (1990-11-01), Kasuga
patent: 5418765 (1995-05-01), Misawa et al.

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