Surveying instrument having an automatic focusing device

Details Surveying instrument having an automatic focusing device Surveying instrument having an automatic focusing device

1997-06-30

1999-07-13

Henry, Jon

Optical: systems and elements

Compound lens system

Telescope

359400, 2502012, 356 501, G02B 2304, G02B 709, G01C 308

Patent

active

059234687

ABSTRACT:
A surveying instrument is provided having a sighting telescope and a distance measuring device. The sighting telescope has a focusing lens group which is moveable to focus an object to be measured. The distance measuring device measures a distance between the object and the surveying instrument. A focusing operation of the sighting telescope is carried out to move the focusing lens group to a focal position of the object in accordance with the distance between the object and the surveying instrument measured by the distance measuring device.

REFERENCES:
patent: 3634011 (1972-01-01), Scholdstrom
patent: 4041505 (1977-08-01), Hartmann
patent: 4542986 (1985-09-01), Berdanier
patent: 4711999 (1987-12-01), Shishido et al.
patent: 5283622 (1994-02-01), Ueno et al.
patent: 5796517 (1998-08-01), Sensui et al.

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