Image reading apparatus having a reflective blazed diffraction g

Details Image reading apparatus having a reflective blazed diffraction g Image reading apparatus having a reflective blazed diffraction g

1992-06-04

1993-06-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

359571, H01J 4014

Patent

active

052218350

ABSTRACT:
A color reading apparatus includes a reflection type one dimensional blazed diffraction grating for color separation which is provided on an optical path between an imaging optical system for focusing a color image on a photosensor, and the photosensor in which three line sensors are disposed on a common substrate. The pitch of the diffraction grating varies in a direction of the pitch so as to control the reflective diffraction angle from reflection points resulting from different incident angles on the diffraction grating and to prevent the occurrence of a blur of .+-.1st-order diffracted light in the pitch cross section on the diffraction grating.

REFERENCES:
patent: 4277138 (1981-07-01), Dammann
patent: 5113067 (1992-05-01), Nakai et al.
patent: 5162943 (1992-11-01), Komats et al.

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