Optical pickup head having a hologram-associated objective lens

Details Optical pickup head having a hologram-associated objective lens Optical pickup head having a hologram-associated objective lens

1989-08-06

1992-05-05

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4424, 369 4412, 369116, 369112, G11B 700

Patent

active

051114488

ABSTRACT:
An optical pickup head for performing recording, reproducing and erasing of information on an optical disc in an optical system employs an objective lens, which is integrated or combined with a holographic optical element, so that the focusing of a diffraction beam on a photo-sensor is stabilized irrespective of the movement of the objective lens due to the tracking control operation in the optical system.

REFERENCES:
patent: 4441175 (1984-04-01), Shuman
patent: 4824191 (1989-02-01), Kato et al.
patent: 4876680 (1989-10-01), Misawa et al.
patent: 4918679 (1990-04-01), Opheij et al.
Goto et al., "Spherical Grating Objective Lenses for Optical Disk Pick-ups", Japanese Journal of Applied Physics, Supplements, vol. 26, No. 4, pp. 135-140, Tokyo, Japan, 1987.

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