Optical pickup using split beams impinging on different photodet

Details Optical pickup using split beams impinging on different photodet Optical pickup using split beams impinging on different photodet

1994-02-04

1997-08-26

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369110, G11B 1100, G11B 700

Patent

active

056617011

ABSTRACT:
Optical pickup apparatus using split beams impinging on different photo-detector areas includes optical structure for projecting a light beam polarized in a predetermined direction toward a recording medium where information is recorded. Optical separating structure is provided for dividing a light beam reflected by the recording medium, with modulation of its polarization state in accordance with the recorded information, into first and second light beams which are polarized in directions perpendicular to each other. First and second light detectors respectively detect the first and second light beams. Preferably, a single lens is located between the separation structure and the first and second light detectors for converging the first and second light beams. Also preferably, the first and second light detectors are formed on the same substrate and are each divided into a plurality of light receiving areas. Further, an amplifier circuit is preferably formed on the same substrate as the first and second light detectors. Where the amplifier is a differential amplifier, it may produce an information signal by differentiating output signals of the first and second light detectors.

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patent: 4951274 (1990-08-01), Iwanaga et al.
patent: 5251196 (1993-10-01), Morimoto et al.
patent: 5251198 (1993-10-01), Strickler

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