Focusing apparatus for a surveying instrument

Details Focusing apparatus for a surveying instrument Focusing apparatus for a surveying instrument

1996-04-24

1998-02-03

Nelms, David C.

Optical: systems and elements

Lens

With support

359696, G02B 702, G02B 1514

Patent

active

057151016

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.

REFERENCES:
patent: 5239417 (1993-08-01), Eguchi et al.
patent: 5266982 (1993-11-01), Soshi

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