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.:
Date of Patent:
Jul. 16, 2024
Filed:
Dec. 05, 2019
Applicant:
Cambridge Mechatronics Limited, Cambridge, GB;
Inventor:
Mark George Easton, Cambridge, GB;
Assignee:
CAMBRIDGE MECHATRONICS LIMITED, Cambridge, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 6/35 (2006.01); F03G 7/06 (2006.01); G02B 6/38 (2006.01);
U.S. Cl.
CPC ...
F03G 7/06143 (2021.08); F03G 7/066 (2021.08); G02B 6/3584 (2013.01); G02B 6/3859 (2013.01); G03B 2205/0076 (2013.01);
Abstract
A method of controlling power delivered to a shape memory alloy, SMA, actuator wire arrangement, wherein the arrangement comprises a plurality of SMA actuator wires, comprising: the steps of: applying, at a PWM frequency, to each of the SMA actuator wires during respective active periods a succession of voltage pulses; and applying, during a resistance measurement period, to one of the plurality of SMA actuator wires a resistance measurement current pulse, wherein the resistance measurement period corresponds to the respective active period of one of the plurality of SMA actuator wires.