Depth estimation system using diffractive effects of the grooves

Details Depth estimation system using diffractive effects of the grooves Depth estimation system using diffractive effects of the grooves

1977-06-28

1979-12-25

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003G, 1791003V, 250550, 250562, 250572, 356355, 356237, G01N 2132, G11B 1100, H04N 576

Patent

active

041808304

ABSTRACT:
Apparatus provides an incident light beam which illuminates the surface of a grooveddisc, having signal elements recorded therein in the form of a succession of spaced apart depressions, with a light spot that spans a plurality of convolutions of the groove. The structure of the grooved convolutions serves as a diffraction grating which reflects the incident light beam into a first plurality of substantially coplanar diverging beams of light. The signal elements also serve as a diffraction grating which reflects the incident light beam into a second plurality of diverging beams of light. Photodetectors, respectively positioned to intercept several of the reflected beams provide outputs corresponding to the light power in the respective reflected beams. Circuits are provided for directly deriving from the photodetector outputs respective estimations of both groove and signal element depths in the region illuminated by the light spot.

REFERENCES:
patent: 3287563 (1966-11-01), Clunis
patent: 3833769 (1974-09-01), Compaan et al.
patent: 3842194 (1974-10-01), Clemens
patent: 3860766 (1975-01-01), Mori
patent: 3919465 (1975-11-01), Adler et al.
patent: 3992593 (1976-11-01), Heine
patent: 4030835 (1977-06-01), Firester et al.
patent: 4064539 (1977-12-01), Lewiner et al.
patent: 4069484 (1978-01-01), Firester et al.

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