Optical pickup apparatus employing nonpolarization beam splitter

Details Optical pickup apparatus employing nonpolarization beam splitter Optical pickup apparatus employing nonpolarization beam splitter

1994-04-07

1995-12-05

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4423, G01J 120

Patent

active

054731542

ABSTRACT:
An optical pickup apparatus for irradiating a light beam on an optical recording medium for recording or reproduction, including a light source, an objective lens, a nonpolarization beam splitter, a photodetector, and a 1/4 wavelength plate. The objective lens focuses the light beam radiated from the light source on to the recording layer of the optical recording medium. The nonpolarization beam splitter is disposed between the objective lens and the light source and separates the light beam emitted from the light source and the light beam reflected by the recording layer of the optical recording medium. The photodetector receives the beam of light reflected by the recording layer of the optical recording medium which has been separated by the nonpolarization beam splitter and deflected 90.degree. in optical path. The 1/4 wavelength plate is disposed on the path of emission of the light beam emitted from the light source between the nonpolarization beam splitter and the optical recording medium.

REFERENCES:
patent: 4507766 (1985-03-01), Saimi et al.
patent: 4973836 (1990-11-01), Matsuoka
patent: 5097463 (1992-03-01), Wagenblast et al.
Patent Abstracts of Japan, vol. 16, No. 256 (P-1368), Oct. 6, 1992 & JP-A-04 060 930 (Pioneer), 26 Feb. 1992.

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