Concave diffraction grating device, reflective dispersion...

Details Concave diffraction grating device, reflective dispersion... Concave diffraction grating device, reflective dispersion...

2011-03-29

2011-03-29

Toatley, Gregory J (Department: 2877)

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

C356S330000, C356S334000, C359S570000, C359S572000, C359S574000

Reexamination Certificate

active

07916292

ABSTRACT:
A concave diffraction grating device, a reflective dispersion device, and a spectral device of the invention include a diffraction grating plane having an aspherical configuration, wherein the diffraction grating plane is symmetrical in a predetermined direction, and asymmetrical in a direction orthogonal to the predetermined direction in such a manner that the curvature of one end portion of the diffraction grating plane in the direction orthogonal to the predetermined direction is gradually decreased, and the curvature of the other end portion thereof is gradually increased. The concave diffraction grating device, the reflective dispersion device, and the spectral device with the above arrangement have desirable slit image forming performance with respect to all the wavelengths in a visible region, and are suitable for mass-production.

REFERENCES:
patent: 6870682 (2005-03-01), Grenier et al.
patent: 7423749 (2008-09-01), Hagler
patent: 2001/0048526 (2001-12-01), Bender
patent: 8-271335 (1996-10-01), None
patent: 2006-98428 (2006-04-01), None

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