Image reading apparatus having a blazed diffraction grating

Details Image reading apparatus having a blazed diffraction grating Image reading apparatus having a blazed diffraction grating

1990-02-13

1992-05-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

359571, H01J 4014

Patent

active

051130670

ABSTRACT:
An image reading apparatus comprises a multiline sensor on which a plurality of linear sensor arrays are arranged on and a single substrate, a focusing optical system for focusing an object image on the multiline sensor. A blazed diffraction grating is disposed in an optical path between the focusing optical system and the multiline sensor, for color-separating light from the object into a plurality of light components, and for guiding the color-separated light components to the corresponding sensor arrays. The grating thickness of the blazed diffraction grating varies in correspondence with an angle of light incident on the blazed diffraction grating.

REFERENCES:
patent: 4277138 (1981-07-01), Dammann
patent: 4539482 (1985-09-01), Nose
patent: 4641944 (1987-02-01), Honda et al.
patent: 4708436 (1987-11-01), Kleinknecht
Applied Optical article entitled "Color Separation Gratings", vol. 17, No. 15, Aug. 1, 1978, pp. 2273-2279.

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