Focusing method and apparatus for a surveying instrument having

Details Focusing method and apparatus for a surveying instrument having Focusing method and apparatus for a surveying instrument having

1997-03-27

1999-08-10

Kim, Robert H.

Optics: measuring and testing

By polarized light examination

With light attenuation

2502012, G01B 1114, G02B 2740

Patent

active

059367369

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.

REFERENCES:
patent: 4394569 (1983-07-01), Nakamura
patent: 4485303 (1984-11-01), Suzuki
patent: 4491402 (1985-01-01), Suzuki
patent: 5126549 (1992-06-01), Yamada et al.
patent: 5266982 (1993-11-01), Soshi

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