Diffraction element and optical machine-reading device

Details Diffraction element and optical machine-reading device Diffraction element and optical machine-reading device

1989-09-28

1992-03-31

Levy, Stuart S.

Registers

Coded record sensors

Particular sensor structure

235457, 235487, 283 91, G06K 710, G06K 1900, B42D 1500

Patent

active

051011840

ABSTRACT:
An article of manufacture contains a substrate which supports a diffraction element divided into surface portions having optically-active microscopic relief structures. At least one pair of surface portions is mirror-symmetric with respect to the orientation of the corresponding relief structures. Each surface portion of the pair has an optically-active, microscopic, asymmetric relief structure defined by an orientation azimuth angle. The azimuth angles are 180.degree. apart. The mirror symmetric pairs constitute optical markings which are machine-readable. The readout device generates an incident light beam and contains photosensors and electronics to output the intensity difference between pairs of diffracted light beams. Alternatively, each surface portion of the diffraction element has a volume hologram rather than a microscopic relief structure for diffracting incident light.

REFERENCES:
patent: 4108367 (1978-08-01), Hannan
patent: 4184700 (1980-01-01), Greenaway
patent: 4211918 (1980-07-01), Nyfeler et al.
patent: 4250217 (1981-02-01), Greenaway
patent: 4501439 (1985-02-01), Antes
patent: 4544836 (1985-10-01), Galvin et al.
patent: 4568141 (1986-02-01), Antes
patent: 4761543 (1988-08-01), Hayden
patent: 4984824 (1991-01-01), Antes et al.
"Optical Holography", by P. Hariharan, Cambridge University Press, 1984, pp. 58-59.

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