Optical data recording and reproducing apparatus including chrom

Details Optical data recording and reproducing apparatus including chrom Optical data recording and reproducing apparatus including chrom

1995-03-23

1997-05-27

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, G11B 700

Patent

active

056338520

ABSTRACT:
An optical data recording and reproducing apparatus includes a laser source, a collimating lens made of a single lens having a positive power to collimate the divergent laser beams emitted from the laser source, and an objective lens which is to converge the collimated light onto a data recording surface of a data recording medium. The chromatic aberration of the objective lens is corrected to reduce the back focal distance thereof as the wavelength increases to cancel the chromatic aberration of the collimating lens.

REFERENCES:
patent: 4210391 (1980-07-01), Chen
patent: 4909616 (1990-03-01), Arai
patent: 5173809 (1992-12-01), Iwaki et al.
patent: 5214537 (1993-05-01), Maruyama
patent: 5321550 (1994-06-01), Maruyama et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5481386 (1996-01-01), Shimano et al.

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