Holographic element diffracting a reflected light beam onto a si

Details Holographic element diffracting a reflected light beam onto a si Holographic element diffracting a reflected light beam onto a si

1996-06-13

1998-07-07

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, G11B 700

Patent

active

057779767

ABSTRACT:
An optical scanning device having a holographic optical element for receiving a scanning beam which has been influenced by a recording medium. One aspect of the invention is to use an optical spatial filter to obtain the information signals. A further aspect is to image the entire area of the scanning spot on only one detector and to use the complete light component, as a result of which the power component is increased and the requirements for adjustment of a plurality of elements with respect to one another are reduced.

REFERENCES:
patent: 4924079 (1990-05-01), Opheij et al.
patent: 4945529 (1990-07-01), Ono et al.
patent: 5231620 (1993-07-01), Ohuchida
patent: 5553050 (1996-09-01), Yang
patent: 5583843 (1996-12-01), Horinouchi
patent: 5648951 (1997-07-01), Kato et al.
Ohba, Akitomo, et al. "Reflection Polarizing Holographic Optical Element for Compact Magnetooptical disk heads" In: Applied Optics, vol. 29, No. 34, Dec. 1, 1990, S. 5131.

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