Optical pickup device

Details Optical pickup device Optical pickup device

1995-11-08

1998-04-21

Nelms, David C.

Optical: systems and elements

Lens

With light limiting or controlling means

G02B 900

Patent

active

057424373

ABSTRACT:
An optical pickup device for condensing the light from a light source on a signal recording surface by an objective lens and for detecting the return light from the signal recording surface by a light detection unit is disclosed. The optical pickup device is capable of recording and/or reproducing at least two different sorts of optical recording media. The light beam radiated from a light source is condensed by an objective lens. An aperture varying unit varies the size of an aperture of the objective lens depending upon the sorts of the optical recording media. The return light from the optical recording medium is detected by a light detection unit. The size of the aperture of the objective lens for condensing the light from the light source is varied depending upon the difference in substrate thickness of the different sorts of the optical recording media, thus assuring high-quality recording/reproduction for two or more different sorts of optical recording media.

REFERENCES:
patent: 5281797 (1994-01-01), Tatsuno
patent: 5392263 (1995-02-01), Watanabe

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