Optical record medium reading apparatus having a de-focussed lig

Details Optical record medium reading apparatus having a de-focussed lig Optical record medium reading apparatus having a de-focussed lig

1989-01-23

1992-10-13

Young, Wayne R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

235456, 369 4435, 369 4442, 369116, 369118, G11B 709

Patent

active

051557185

ABSTRACT:
An apparatus for reading information out of an optical record medium including a semiconductor laser diode for emitting a laser beam, a collimator lens, a beam splitter, an objective lens, converging lens and a photodetector. The laser beam emitted from the laser diode is made incident upon the optical record medium via the collimator lens, beam splitter and objective lens, and a light flux reflected by the optical record medium is made incident upon the photodetector via the objective lens, beam splitter and converging lens. The laser diode and collimator lens are arranged such that the laser beam is projected upon the optical record medium in a de-focused condition, while the objective lens is in-focused on the optical record medium.

REFERENCES:
patent: 4346471 (1982-08-01), Hirasawa et al.
patent: 4635244 (1987-01-01), Gotoh
patent: 4661942 (1987-04-01), Yoshimoto et al.
patent: 4761775 (1988-08-01), Murakami
patent: 4805162 (1989-02-01), Stahl et al.
patent: 4918415 (1990-04-01), Hashimoto et al.
patent: 4918675 (1990-04-01), Lee
patent: 4965785 (1990-10-01), Tadokoro et al.

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