Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2006-10-17
2006-10-17
Chang, Audrey (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S566000, C359S573000, C359S575000, C345S008000
Reexamination Certificate
active
07123415
ABSTRACT:
The invention provides an optical instrument including means (1, 2) to produce an optical image to be viewed by an observer including a diffractive element (7) located at an intermediate focal or image plane (4) of the optical instrument and comprising a pattern of a plurality of areas effective to cause diffraction interference in light passing through the optical instrument and thereby produce an expanded exit pupil (6) comprising a combination of a multiplicity of exit pupils displaced relative to one another transverse to an optical axis (3) of said instrument.
REFERENCES:
patent: 3453035 (1969-07-01), Walther
patent: 5046793 (1991-09-01), Hockley et al.
patent: 5218471 (1993-06-01), Swanson et al.
patent: 5701132 (1997-12-01), Kollin et al.
patent: 6028704 (2000-02-01), Freeman
patent: 6608720 (2003-08-01), Freeman
patent: 0584769 (1992-03-01), None
patent: WO 89/06818 (1989-07-01), None
patent: WO 94/27177 (1994-11-01), None
Optical Engineering, “Dammann gratings for laser beam shaping”, Jahns et al., Dec. 1989, vol. 28, No. 12, pp. 1267 to 1275.
Chang Audrey
Shoemaker and Mattare
Vision Engineering Limited
LandOfFree
Optical instrument and optical element providing expanded... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical instrument and optical element providing expanded..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical instrument and optical element providing expanded... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3697626