Method and apparatus for correcting focus in an optical recordin

Details Method and apparatus for correcting focus in an optical recordin Method and apparatus for correcting focus in an optical recordin

1991-08-23

1993-05-04

LaRoche, Eugene R.

Dynamic information storage or retrieval

Storage medium structure

Layered

369100, 369 4423, 2502012, 2502015, G11B 708

Patent

active

052088014

ABSTRACT:
An optical recording system. The system is directed towards optical recording media which is responsive to at least two wavelengths of light such as an erase beam and a record beam. Light of a lower wavelength is produced by a divergent light source such as a diode and only partially collimated in a collimating lens. When the record and erase beams pass through a common objective for focusing on the recording media, the slightly divergent lower wavelength beam is focused at the same location as the fully collimated higher wavelength beam.

REFERENCES:
patent: 4398203 (1983-08-01), Cornet
patent: 4430659 (1984-02-01), Maffitt et al.
patent: 4520471 (1985-05-01), Carlin
patent: 4527173 (1985-07-01), Gupta et al.
patent: 4578788 (1986-03-01), Ahn et al.
patent: 4645712 (1987-02-01), Ishigaki et al.
patent: 4651172 (1987-03-01), Watanabe et al.
patent: 4667316 (1987-05-01), Suda et al.
patent: 4673626 (1987-06-01), Takeda et al.
patent: 4680458 (1987-07-01), Drexler
patent: 4680745 (1987-07-01), Ota et al.
patent: 4700336 (1987-10-01), Yoshida et al.
patent: 4709363 (1987-11-01), Dirks et al.
patent: 4710452 (1987-12-01), Raychaudhuri
patent: 4719615 (1988-01-01), Feyrer et al.
patent: 4730293 (1988-03-01), Pierce et al.
patent: 4752922 (1988-06-01), MacAnally et al.
patent: 4771413 (1988-09-01), Nago
patent: 4773059 (1988-09-01), Minemura et al.
patent: 4780867 (1988-10-01), Lind et al.
patent: 4791625 (1988-12-01), Nakamura
patent: 4798785 (1989-01-01), Pan et al.
patent: 4823334 (1989-04-01), Tanaka et al.
patent: 4825430 (1989-04-01), Halter et al.
patent: 4841514 (1989-06-01), Tsuboi et al.
patent: 4852075 (1989-07-01), Feyrer et al.
patent: 4852077 (1989-07-01), Clark et al.
patent: 4853912 (1989-08-01), Akasaka et al.
patent: 4879709 (1989-11-01), Clark
patent: 4888755 (1989-12-01), Itoh
patent: 4896314 (1990-01-01), Skiens et al.
patent: 4918682 (1990-04-01), Finegan
Watkinson, The Art of Digital Audio, Chapter 13, pp. 440-486, Focal Press (1988).
Hartman et al., "Erasable Bilayer Dye-Polymer Optical Recording Medium".
Miyaoka, "Digital audio is compact and rugged," IEEE Spectrum (Mar. 1984) pp. 35-39.
Jenkins et al., "Fundamentals of Optics" (1976) pp. 176-184.
NRC Advertising Materials (unknown date), pp. m-13 to m-15.

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