Optical pickup with conversion of diffusion angle of outgoing li

Details Optical pickup with conversion of diffusion angle of outgoing li Optical pickup with conversion of diffusion angle of outgoing li

1995-09-26

1998-08-04

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369109, 369110, G11B 700

Patent

active

057905029

ABSTRACT:
In an optical pickup, light, emitted from a light-emitting element, is transmitted through a first beam splitter film with polarization selectivity, and a zero-order diffraction beam and two (.+-.) first order diffraction beams are produced. These beams are applied in a condensed manner to an optical disk through a condensing element, and the return light beam from the optical disk is fed to a photodetector through a second beam splitter film with polarization selectivity, thereby effecting the recording and reproduction of information, the tracking and the focusing. A diffusion angle conversion hologram is provided between the light-emitting element and the first beam splitter film, and with respect to the diffusion angle conversion hologram, the relation between the diffusion angle of the incident beam and the diffusion angle of the outgoing beam is specified. With this arrangement, the light to be incident on the condensing element can have an ideal spherical wave free from a wave aberration, so that an image spot on the optical disk can be condensed into a diffraction limit, and besides by correcting the phase of the beam, a RF signal with a high C/N ratio, a stable focus error signal and a stable track signal are detected.

REFERENCES:
patent: 4253723 (1981-03-01), Kojima et al.
patent: 4730899 (1988-03-01), Kime et al.
patent: 5005162 (1991-04-01), Mitsumori et al.
patent: 5095476 (1992-03-01), Greve et al.

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