Lens system for compact camera
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 17, 1991
Grant Date -
N/A
app pub date -
Aug 27, 1990
filing date -
Aug 27, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lens system is characterized by a back focal length that substantially exceeds its front focal length. An input lens having a relatively short focal length is arranged to receive an image. The back of the input lens is a mirrored concave surface that is inclined in such a way as to direct the reflected image to a concave mirror. The concave mirror and a Mangin mirror having a convex mirrored back surface form a relay lens system for redirecting the image reflected from the concave mirror to a second point on that mirror from which the image is reflected to a predetermined focal point. The Mangin mirror is arranged to remove chromatic and spherical aberrations from the virtual image. The lenses and mirrors of the system are arranged so that the optical distance from the concave mirror to the predetermined focus is at least three times the focal length of the first lens.
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Cited Art Landscape
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