Color image reading apparatus with blazed diffraction grating

Details Color image reading apparatus with blazed diffraction grating Color image reading apparatus with blazed diffraction grating

1992-04-10

1992-12-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250226, 250237R, 359571, H01J 4014, G02B 518

Patent

active

051735997

ABSTRACT:
A color image reading apparatus comprises a plurality of line sensors, an optical system for forming an image of a subject, a blazed diffraction grating inserted in light path between the optical system and the sensors, and a slit inserted in light path between the subject and the optical system. The blazed diffraction grating separates light beams from the subject into plurality color lights and directs them to their corresponding sensor arrays. The slit has an aperture, the size of which in the array direction of the sensors is longer than that in the direction perpendicular to the array direction of the sensors. By construction of the apparatus according to the present invention, noise light can be prevented so as to read high accuracy digital color image.

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patent: 5113067 (1992-05-01), Nakai et al.

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