Focusing lens position detection apparatus and an auto-focus sur

Optical: systems and elements – Lens – With support

Patent

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Details

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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patent: 5936736 (1999-08-01), Suzuki et al.

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