Image reading apparatus with reflection type blazed diffraction

Details Image reading apparatus with reflection type blazed diffraction Image reading apparatus with reflection type blazed diffraction

1994-05-26

2000-02-22

Spyrou, Cassandra

Optical: systems and elements

Diffraction

From grating

359569, 359571, 2502081, G02B 518, H01L 2700

Patent

active

060287055

ABSTRACT:
A color image reading apparatus is provided wherein a color picture image is read out by a monolithic three line sensor through a reflection type one-dimensional blazed diffraction grating acting as a color separating means. The diffraction grating is concavely curved forward the line sensor, and a light beam, diverging after being focused by an image forming optical element having a predetermined refracting power only in a sub-scan cross section, is color-separated into three color light components by the diffraction grating and re-imaged on the surface of the three line sensors located at a predetermined position. As a result, the blur of .+-.1 order diffracted lights in a sub-scanning direction can be prevented which is due to the deviation of a reflective diffraction angle resulting from the difference in an incident angle of respective lights on the grating surface in the sub-scan cross section. At this time, a convergent spherical wave that is a light beam emerging from the image forming optical system enters the diffraction grating.

REFERENCES:
patent: 3680945 (1972-08-01), Sheridon
patent: 4277138 (1981-07-01), Daummann
patent: 4330175 (1982-05-01), Fujii et al.
patent: 4405405 (1983-09-01), Fujii et al.
patent: 5113067 (1992-05-01), Nakai et al.
patent: 5162943 (1992-11-01), Komatsu et al.
patent: 5173599 (1992-12-01), Setani
Patent Abstracts of Japan, vol. 12, No. 368 (P-766) Oct. 4, 1988.
Patent Abstracts of Japan, vol. 15, No. 140 (P-1188) Apr. 9, 1991.

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