Optical disk apparatus and optical head thereof

Details Optical disk apparatus and optical head thereof Optical disk apparatus and optical head thereof

1996-09-11

1997-12-16

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 94, 369117, 369118, G11B 700

Patent

active

056993412

ABSTRACT:
The present invention comprises an arrangement with removable optical element having a predetermined focal distance in the light path between a light source and an objective lens, so as to insert said optical element into the light path between the light source and the objective lens for playing back or recording onto one type of thickness of disk plates, as well as to remove it therefrom for playing back or recording onto another type of thickness of disk plates. Alternatively, by retaining variably the distance between the light source and the collimator lens, the distance between the light source and the collimator lens along with the light path is variably changed according to the thickness of the disk plate being inserted. Then by determining the type of the disk inserted and accordingly selectably inserting/removing the optical element, only one objective lens may be used to conform to the disk plates having different thicknesses.

REFERENCES:
patent: 5281797 (1994-01-01), Tatsuno et al.
patent: 5526338 (1996-06-01), Hasman et al.

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