IR-pancratic optical device
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United States of America Patent
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-
Nov 26, 1991
Grant Date -
N/A
app pub date -
Jul 11, 1990
filing date -
Jul 22, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is directed to an IR-pancratic optical device which includes a drive for displacing optical members thereof. The drive permits the focal length range to be passed through in 0.5 second. The drive includes a rotatably mounted drum on which a steel band is attached. Redirecting roller guides are provided to enable the rotational movement to be translated into a linear movement. The IR-pancratic optical device includes forward and rearward optical members and two intermediate optical members are arranged therebetween. One of the intermediate optical members is attached to the band and is moved along the optical axis. A cam control couples the movement of the second intermediate optical member to the movement of the first intermediate optical member.
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