Image reading apparatus with a diffraction grating

Details Image reading apparatus with a diffraction grating Image reading apparatus with a diffraction grating

1991-05-14

1992-11-10

Arnold, Bruce Y.

Optical: systems and elements

Diffraction

From grating

359569, 359574, 250226, G02B 2744

Patent

active

051629437

ABSTRACT:
An image reading apparatus including a diffraction grating element including a transparent plate shaped in the form of consecutive steps to separate a light reflected from a document into a zero order light, -1 order light, and +1 order light. The transparent plate is arranged so that the zero order light has a wavelength in a blue region and +1 order light and -1 order light have wavelengths either in green and red regions, respectively or in red and green regions, respectively.

REFERENCES:
patent: 4204881 (1980-05-01), McGrew
patent: 4246338 (1981-01-01), Kaplan
patent: 4277138 (1981-07-01), Dammann
patent: 5113067 (1992-05-01), Nakai et al.
Dammann, H. "Color Separation Grating" Applied Optics, vol. 17, No. 15 Aug. 1, 1978, pp. 2273-2279.

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