Spectrometer apparatus for self-calibrating color imaging appara

Details Spectrometer apparatus for self-calibrating color imaging appara Spectrometer apparatus for self-calibrating color imaging appara

1988-11-07

1990-02-06

McGraw, Vincent P.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356404, 358 75, G01J 328, H04N 146

Patent

active

048984671

ABSTRACT:
Spectrometer apparatus, for self-calibrating a color image scanner of the line scanner or area scanner type, comprises a member, having an optical slit, movable into position on an optical axis of the scanner between its polychromatic light source and its focusable lens in a plane occupied by a color image when it is scanned. A diffraction grating is similarly movable onto the optical axis, a given distance from an image sensor of the scanner. The light source illuminates the slit and the diffraction grating disperses transmitted polychromatic light according to its wavelength, forming duplicate spectra off-axis across respective halves of the image sensor, with longer wavelengths being diverted to respectively higher angles.

REFERENCES:
patent: 4544269 (1985-10-01), Nose et al.
patent: 4595290 (1986-06-01), Nose et al.
patent: 4650988 (1987-03-01), Suzuki et al.
patent: 4695892 (1987-09-01), Mary

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