Optical pickup device including a beam splitter having an inclin

Details Optical pickup device including a beam splitter having an inclin Optical pickup device including a beam splitter having an inclin

1990-02-15

1990-11-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4423, G01J 120

Patent

active

049738364

ABSTRACT:
An optical pickup device in which, e.g., a semiconductor laser is used as a light source and light fluxes from the light source are irradiated onto an optical information recording medium, thereby performing either one of or both recording and reproduction of information into and from the recording medium is provided. The device includes: a light source to generate a light beam which is irradiated to the optical recording medium; a polarizing or non-polarizing beam splitter, arranged on the optical path from the light source to the recording medium and consisting of prisms, for transmitting the light beam from the light source and leading to the recording medium, and for separating the light reflected by the recording medium from the light beam from the light source; and photodetectors, arranged almost rectilinearly, for receiving the reflected light from the recording medium which is separated by the beam splitter, wherein among the planes of the beam splitter, the plane opposite to the plane which faces the direction of the photodetectors has a shape adapted to lead the light beam reflected by this plane to the direction which is almost perpendicular to the arrangement direction of the photodetectors. With this apparatus, the signals can be detected with a high S/N ratio.

REFERENCES:
patent: 3628027 (1971-12-01), Brauss
patent: 4607359 (1986-08-01), Matsubayashi et al.
patent: 4731527 (1988-03-01), Nomura et al.
patent: 4771414 (1988-09-01), Yoshimatsu
patent: 4907858 (1990-03-01), Hara et al.

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