Groove depth estimation system using diffractive groove effects

Details Groove depth estimation system using diffractive groove effects Groove depth estimation system using diffractive groove effects

1977-06-28

1979-05-15

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003G, 1791003V, 250550, 250562, 250572, 346 33F, 356237, G01D 539, G01N 2132, H04N 576

Patent

active

041550986

ABSTRACT:
Groove depth estimation apparatus provides an incident light beam which illuminates the surface of a grooved disc with a light spot that spans a plurality of convolutions of the groove. The structure of the groove convolutions serves as a diffraction grating which reflects the incident light beam into a plurality of diverging beams of light. A photodetector provides measurements of the light power in the respective reflected beams. Calculator circuits are provided for deriving from the photodetector measurements estimation of the average groove depth in the region illuminated by the light spot.

REFERENCES:
patent: 3287563 (1966-11-01), Clunis
patent: 3833769 (1974-09-01), Compaan et al.
patent: 3860766 (1975-01-01), Mori
patent: 3909517 (1975-09-01), Clemens
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
patent: 4069484 (1978-01-01), Firester et al.

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