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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 10211387 B1

PDFFull Text
Date of Patent:
Feb. 19, 2019

Filed:

Mar. 20, 2017

Method for controlling ultrasonic motor and surveying instrument for the same

Applicant:

Topcon Corporation, Tokyo, JP;

Inventors:

Kaoru Kumagai, Tokyo, JP;

Satoshi Yanobe, Tokyo, JP;

Tetsutaro Kouji, Tokyo, JP;

Assignee:

TOPCON CORPORATION, Tokyo, JP;

Attorney:

Roberts Mlotkowski Safran Cole & Calderon, P.C.

Primary Examiner:

Bickey Dhakal

Int. Cl.
CPC ...
H02P 23/20 (2016.01); H01L 41/04 (2006.01); B06B 1/06 (2006.01); G01C 3/08 (2006.01); G01D 5/347 (2006.01); G01S 3/786 (2006.01); H01L 41/09 (2006.01); G01C 15/00 (2006.01); H02N 2/14 (2006.01); H02N 2/16 (2006.01);
U.S. Cl.
CPC ...
H01L 41/042 (2013.01); B06B 1/0644 (2013.01); G01C 3/08 (2013.01); G01C 15/002 (2013.01); G01D 5/3473 (2013.01); G01S 3/786 (2013.01); H01L 41/09 (2013.01); H02N 2/142 (2013.01); H02N 2/163 (2013.01);
Abstract

Provided is a method for controlling an ultrasonic motor to reduce noise sounding during low-speed rotation in a surveying instrument adopting the ultrasonic motor for a rotary shaft, and a surveying instrument for the same. In a method for controlling an ultrasonic motor according to an aspect of the present invention, in a low-speed rotation range of an ultrasonic motor, a ratio of an acceleration period as a time of application of the drive signal in a control cycle is controlled, and a time to start the acceleration period is randomly shifted for each control cycle. In a method for controlling an ultrasonic motor according to another aspect, a time to start the acceleration period is regularly shifted for each control cycle. In a method for controlling an ultrasonic motor according to still another aspect, second-half acceleration control and first-half acceleration control are alternately repeated.

Find Patent Forward Citations

Kumagai, Kaoru. (2019). Method for controlling ultrasonic motor and surveying instrument for the same (U.S. Patent No. 10211387). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/10211387

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