Surgical microscope with rapid focal-length changer
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United States of America Patent
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Dec 4, 1990
Grant Date -
N/A
app pub date -
Sep 20, 1989
filing date -
Sep 26, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention contemplates a stereoscopic binocular surgical microscope wherein a principal objective of defined focal length is rigidly attached to the microscope and serves both observation-ray paths; an additional lens system is swingably positionable in and out of the ray paths for quick change of focal length, without changing the principal objective, and the additional lens system has provision for selective small radial adjustment of the axis of the additional lens system with respect to the axis of the principal objective, when in operative position.
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