Focusing method and apparatus for a surveying instrument having an AF function, and arrangement of an AF beam splitting optical system therein
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United States of America Patent
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Aug 10, 1999
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N/A
app pub date -
Mar 27, 1997
filing date -
Sep 30, 1996
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Expired
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Abstract
In a focusing method for a surveying instrument having a sighting telescope for sighting an object and a distance measuring device for measuring the distance of the object, an automatic focusing function in which the focus state ofthe sighting telescope is detected so that an optical focusing system is automatically focused on the object in accordance with the focus state thus detected, or a distance priority focusing function in which the optical focusing system of the sighting telescope is driven in accordance with the object distance measured by the distance measuring device, is selectively used. The disclosure is also directed to a focusing apparatus and a surveying instrument.
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