Optical head with a micro fresnel lens integrated on a beam spli

Details Optical head with a micro fresnel lens integrated on a beam spli Optical head with a micro fresnel lens integrated on a beam spli

1996-05-31

1998-07-07

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369103, 369109, 369110, G11B 700

Patent

active

057779716

ABSTRACT:
Disclosed is an optical pickup having simplified constitution. A light source for radiating laser beam for reading an optical disc is comprised. A beam splitter for separating the laser beam radiated from the light source into transmitting light and reflecting light and for separating light from the optical disc into transmitting light and reflecting light is provided. Installed is an objective lens for converging light from the beam splitter to form a focus on the optical disc and for forwarding light from the optical disc to the beam splitter. A micro fresnel lens attached on one side of the beam splitter is included. The micro fresnel lens generates astigmatism and converges the incident light from the beam splitter. A photodetector receives light from the micro fresnel lens, reproduces information recorded on the optical disc and detects a focus error. The manufacture of the optical pickup is advantageous and the product has improved quality.

REFERENCES:
patent: 4737447 (1988-04-01), Suzuki et al.
patent: 4870632 (1989-09-01), Shiono et al.
patent: 4935911 (1990-06-01), Ohuchida et al.
patent: 5231620 (1993-07-01), Ohuchida
patent: 5345336 (1994-09-01), Aoyama et al.
patent: 5377177 (1994-12-01), Horinouchi et al.
patent: 5646929 (1997-07-01), Choi
Patent Abstracts of Japan, vol. 3, No. 14, 29 Mar. 1996--JP 7-311961A Nippon Steel Corporation, 28 Nov. 1995.
European Search Report, EP 96303808.8, sent Jan. 12, 1998.

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