Planar optical scanning head with concentric diffraction grating

Details Planar optical scanning head with concentric diffraction grating Planar optical scanning head with concentric diffraction grating

1991-07-11

1992-09-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

385 37, 369 4412, E04G 1706

Patent

active

051460807

ABSTRACT:
A planar optical head is described, which comprises a detector grating (15) for scanning a surface, for example, a recording layer (2) in an optical record carrier (1). A radiation source (5) supplies a beam (6) which is coupled into a waveguide (9) by an input grating (7) and is formed to a focused scanning beam (11) by an output grating (10). A scanning focus (13) having an optimum shape and a high intensity is obtained by arranging, in the path of the beam reflected by the record carrier, a special detector grating (15) which deflects this beam towards a detection system (17).

REFERENCES:
patent: 4991919 (1991-02-01), Nishiwaki et al.
patent: 5070488 (1991-12-01), Fukushima et al.

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