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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10215854 B1

PDFFull Text
Date of Patent:
Feb. 26, 2019

Filed:

Apr. 23, 2015

Distance measuring module comprising a variable optical attenuation unit including an lc cell

Applicant:

Hexagon Technology Center Gmbh, Heerbrugg, CH;

Inventors:

Jürg Hinderling, Marbach, CH;

Paul Benz, Diepoldsau, CH;

Josef Lais, Marbach, CH;

Assignee:

HEXAGON TECHNOLOGY CENTER GMBH, Heerbrugg, CH;

Attorney:

Maschoff Brennan

Primary Examiner:

Samantha K Abraham

Int. Cl.
CPC ...
G01C 3/08 (2006.01); G01S 17/08 (2006.01); G01C 15/00 (2006.01); G01S 7/481 (2006.01); G01S 7/486 (2006.01); G01S 7/499 (2006.01); G02F 1/1335 (2006.01); G02F 1/1343 (2006.01); G01S 17/42 (2006.01); G01S 17/66 (2006.01); G02F 1/133 (2006.01);
U.S. Cl.
CPC ...
G01S 17/08 (2013.01); G01C 15/002 (2013.01); G01S 7/4813 (2013.01); G01S 7/4814 (2013.01); G01S 7/4816 (2013.01); G01S 7/4868 (2013.01); G01S 7/499 (2013.01); G02F 1/133528 (2013.01); G02F 1/134309 (2013.01); G01S 17/42 (2013.01); G01S 17/66 (2013.01); G02F 1/13306 (2013.01); G02F 2001/13355 (2013.01); G02F 2001/134372 (2013.01);
Abstract

The invention relates to a surveying apparatus, in particular tachymeter, laser scanner, profiler or laser tracker, comprising an electronic laser distance measuring module, which comprises an optical transmission channel and an optical reception channel for laser measurement radiation, wherein a variable optical attenuation unit for the laser measurement radiation is provided in the optical transmission channel and/or optical reception channel. According to the invention, light impinging on the attenuation unit is attenuated by means of liquid crystals. The attenuation unit comprises at least one polarizer, in particular comprising a polarization sheet, a liquid crystal shutter, in particular comprising nematic liquid crystals, having a variable transmission, a first analyzer, in particular comprising a polarization sheet.

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