Aperture-limiting element and optical head utilizing the same

Details Aperture-limiting element and optical head utilizing the same Aperture-limiting element and optical head utilizing the same

1997-12-05

2000-02-29

Young, W. R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

359316, 359573, 359575, 359894, G11B 700

Patent

active

060318090

ABSTRACT:
The optical head has a light source, a collimating lens, an aperture-limiting element and an objective lens in the mentioned order in the direction of progress of light emitted from the light source, and a photo-detecting system for detecting return light having been transmitted through the objective lens and reflected by an optical disk. The aperture-limiting element includes a plurality of stripe transparent electrodes spaced apart at a predetermined interval on an electro-optical crystal substrate, and a substantially circular non-electrode area lacking the stripe transparent electrodes at a center portion of the substrate. The aperture-limiting element can be constructed with a reduced number of components as compared with the prior art construction.

REFERENCES:
patent: 3787111 (1974-01-01), Giordmaine et al.
patent: 5093747 (1992-03-01), Dorschner
patent: 5748603 (1998-05-01), Kim et al.
patent: 5793734 (1998-08-01), Tsuchiya et al.
patent: 5793735 (1998-08-01), Oono
patent: 5798994 (1998-08-01), Kamatani
patent: 5859818 (1999-01-01), Tateishi et al.
patent: 5901131 (1999-05-01), Ootaki et al.
Nikkei Electronics, No. 654, Jan. 29, 1996, pp. 15-16.
Nikkei Mechanical, No. 47, Feb. 5, 1996, p. 16.

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