Planar optical scanning head having deficiency-correcting gratin

Details Planar optical scanning head having deficiency-correcting gratin Planar optical scanning head having deficiency-correcting gratin

1991-07-11

1993-04-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 4412, 359573, 385 37, G01J 120

Patent

active

052045161

ABSTRACT:
A planar optical head is described with a corrected input grating for scanning a surface, for example, a recording surface (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). Deficiencies of the radiation beam such as the non-round cross-section of the beam, astigmatism and wavelength variations caused by the radiation source can be corrected by means of an adapted grating structure of the input grating.

REFERENCES:
patent: 4779259 (1988-10-01), Kono et al.
patent: 4935911 (1990-06-01), Ohuchida et al.
patent: 4991919 (1991-02-01), Nishiwaki et al.
patent: 5070488 (1991-12-01), Fukushima et al.
patent: 5081615 (1992-01-01), Sunagawa

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