Focusing apparatus for a surveying instrument
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United States of America Patent
Stats
-
Feb 3, 1998
Grant Date -
N/A
app pub date -
Apr 24, 1996
filing date -
Apr 26, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A focusing apparatus for a surveying instrument including an objective lens, a focusing lens and a reticle. The focusing lens is movable in an optical axis direction, by a rotating shaft member which is rotated by a motor, to form an image, of an object to be surveyed, on the reticle. Means for detecting a focus state of the object image and for controlling the motor in accordance with the detected focus state are provided. A focusing knob, coaxial with the rotating shaft member, and movable in an axial direction thereof is also provided. A plurality of clutches disengageably engages the focusing knob or the motor with the rotating shaft member, according to an axial movement of the focusing knob.
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Cited Art Landscape
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