Optical: systems and elements – Lens – Reverse telephoto
Reexamination Certificate
2008-08-19
2010-06-08
Spector, David N (Department: 2873)
Optical: systems and elements
Lens
Reverse telephoto
C359S676000, C359S432000
Reexamination Certificate
active
07733581
ABSTRACT:
Large aperture optical systems that are extremely well corrected over a large flat field and over a large spectral range are disclosed. Breathing and aberration variation during focusing are optionally controlled by moving at least two groups of lens elements independently. Aberration correction in general is aided by allowing the working distance to become short relative to the format diagonal. Field curvature is largely corrected by a steeply curved concave surface relatively close to the image plane. This allows the main collective elements to be made of low-index anomalous dispersion materials in order to correct secondary spectrum. In wide-angle example embodiments, distortion may be controlled with an aspheric surface near the front of the lens.
REFERENCES:
patent: 1975678 (1934-10-01), Bertele
patent: 2012822 (1935-08-01), Lee
patent: 2310502 (1943-02-01), Warmisham
patent: 2649021 (1953-08-01), Angenieux
patent: 2978957 (1961-04-01), Becker et al.
patent: 3255664 (1966-06-01), Smith
patent: 3300267 (1967-01-01), Pennig
patent: 3445154 (1969-05-01), Schlegel
patent: 3454326 (1969-07-01), Schlegel
patent: 3504961 (1970-04-01), Hoogland
patent: 3586420 (1971-06-01), Hu
patent: 3817602 (1974-06-01), Kazamaki et al.
patent: 3992085 (1976-11-01), Momiyama
patent: 3994576 (1976-11-01), Glatzel et al.
patent: 4025169 (1977-05-01), Fischer et al.
patent: 4095873 (1978-06-01), Takahiro
patent: 4136931 (1979-01-01), Glatzel
patent: 4310223 (1982-01-01), Conrad
patent: 4329024 (1982-05-01), Rogers
patent: 4395094 (1983-07-01), Hamanishi
patent: 5315441 (1994-05-01), Hori et al.
patent: 5920432 (1999-07-01), Suenaga
patent: 7012759 (2006-03-01), Betensky et al.
patent: 7224535 (2007-05-01), Neil
patent: 7227682 (2007-06-01), Caldwell et al.
Opticus IP Law PLLC
Spector David N
LandOfFree
Large aperture imaging optical system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Large aperture imaging optical system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Large aperture imaging optical system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4184432