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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 10141880 B1

PDFFull Text
Date of Patent:
Nov. 27, 2018

Filed:

Oct. 22, 2015

Driving circuit for voice coil motor having a first driver coupled to a first end of a coil and a second driver coupled to a second end of the coil

Applicant:

Rohm Co., Ltd., Ukyo-Ku, Kyoto, JP;

Inventor:

Tatsuya Ninomiya, Kyoto, JP;

Assignee:

ROHM CO., LTD., Kyoto, JP;

Attorney:

Cantor Colburn LLP

Primary Examiner:

Arnel C Lavarias

Int. Cl.
CPC ...
G02B 27/64 (2006.01); H02P 25/028 (2016.01); G02B 7/04 (2006.01); G02B 7/08 (2006.01); H02P 25/06 (2016.01); H04N 5/225 (2006.01); H04N 5/232 (2006.01); H02P 25/034 (2016.01);
U.S. Cl.
CPC ...
H02P 25/028 (2013.01); G02B 7/04 (2013.01); G02B 7/08 (2013.01); G02B 27/646 (2013.01); H02P 25/034 (2016.02); H02P 25/06 (2013.01); H04N 5/2254 (2013.01); H04N 5/23287 (2013.01); G03B 2205/0069 (2013.01);
Abstract

With a driving current as I, with a reference voltage as V, and with a gain as k, a current detection circuit generates a detection voltage Vrepresented by V=V+k×I. An error amplifier amplifies a difference between the detection voltage Vand a control voltage that indicates a position of the VCM so as to generate an error voltage V. A first driver switches the driving current Ibetween a source current and a sink current with respect to one end of the coil according to the error voltage V. A second driver switches the driving current Ibetween a sink current and a source current with respect to the other end of the coil according to the error voltage V. The driving circuit allows an external circuit to set the level of the reference voltage V.

Find Patent Forward Citations

Ninomiya, Tatsuya. (2018). Driving circuit for voice coil motor having a first driver coupled to a first end of a coil and a second driver coupled to a second end of the coil (U.S. Patent No. 10141880). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/10141880

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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