Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2007-09-18
2007-09-18
Chang, Audrey Y. (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S576000, C359S574000, C359S566000
Reexamination Certificate
active
10885592
ABSTRACT:
A diffractive optical element including a stack of first, second and third optical regions or a stack of first, second, third and fourth optical regions, a first relief pattern formed between the first and second optical regions, and a second relief patterns formed between the second and third or between the third and fourth optical regions. The first and second relief patterns have substantially identical pitch distributions and are substantially aligned in a direction of an optical axis. Depths of the first and second relief patterns are set such that a wavelength dependency of diffraction efficiency can be decreased over a wavelength range to be used. It is possible to manufacture in a simple manner at a low cost a diffractive optical element in which undesired flare and ghost are suppressed.
REFERENCES:
patent: 3603668 (1971-09-01), DeBitetto
patent: 3980883 (1976-09-01), Franks
patent: 4426130 (1984-01-01), Knop
patent: 4729640 (1988-03-01), Sakata
patent: 5048925 (1991-09-01), Gerritsen et al.
patent: 5093749 (1992-03-01), Maeda
patent: 5175647 (1992-12-01), Gupta et al.
patent: 5680231 (1997-10-01), Grinberg et al.
patent: 5701005 (1997-12-01), Meyers
patent: 6157488 (2000-12-01), Ishii
patent: 62269104 (1987-11-01), None
patent: 62289804 (1987-12-01), None
patent: 243503 (1990-02-01), None
patent: 2239203 (1990-09-01), None
patent: 02296205 (1990-12-01), None
patent: 03052893 (1991-03-01), None
patent: 03213802 (1991-09-01), None
patent: 659218 (1994-03-01), None
Gary J. Swanson, “Binary Optics Technology: The Theory and Design of Multi-Level Diffractive Optical Elements,” Technical Report 854, MIT Lincoln Laboratory, Aug. 1989.
Japanese Office Action dated Jul. 13, 2004.
Chang Audrey Y.
Olympus Corporation
Stevens Davis Miller & Mosher LLP
LandOfFree
Diffractive optical element does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Diffractive optical element, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diffractive optical element will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3771166