Optical: systems and elements – Lens – With support
Patent
1999-06-11
2000-06-06
Mack, Ricky
Optical: systems and elements
Lens
With support
G02B 702
Patent
active
060726423
ABSTRACT:
Disclosed is a focusing lens position detection apparatus provided in an auto-focus surveying instrument that includes a telescopic optical system having a focusing lens which moves along an optical axis, a beam splitter which splits object light transmitted through the focusing lens to produce light split from the telescopic optical system, and a focus detector which receives the split light from the beam splitter. The focusing lens position detection apparatus includes: an indicia member provided on the focusing lens, which is located outside the light path of the telescopic optical system; and a light path changing member provided between the beam splitter and the focus detector, which is movable between a first position in which the split beam from the beam splitter can be received by the focus detector and a second position; wherein the light from the indicia member can be received by the focus detector.
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Asahi Kogaku Kogyo Kabushiki Kaisha
Mack Ricky
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