US 11,914,219 B2
Actuator driver
Jun Maede, Kyoto (JP); Akihito Saito, Kyoto (JP); and Yoshihiro Sekimoto, Kyoto (JP)
Assigned to ROHM CO., LTD., Kyoto (JP)
Filed by ROHM CO., LTD., Kyoto (JP)
Filed on Jun. 15, 2021, as Appl. No. 17/348,030.
Application 17/348,030 is a division of application No. 15/726,802, filed on Oct. 6, 2017, granted, now 11,067,767.
Claims priority of application No. 2016-198760 (JP), filed on Oct. 7, 2016; and application No. 2017-118635 (JP), filed on Jun. 16, 2017.
Prior Publication US 2021/0311283 A1, Oct. 7, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 7/02 (2021.01); G02B 7/08 (2021.01); G01J 1/04 (2006.01); G01D 5/14 (2006.01); G01D 3/036 (2006.01); G01K 13/00 (2021.01); H02K 11/22 (2016.01); H02K 11/215 (2016.01)
CPC G02B 7/028 (2013.01) [G01D 3/036 (2013.01); G01D 3/0365 (2013.01); G01D 5/145 (2013.01); G01J 1/0403 (2013.01); G01K 13/00 (2013.01); G02B 7/08 (2013.01); H02K 11/215 (2016.01); H02K 11/22 (2016.01)] 8 Claims
OG exemplary drawing
 
1. A lens control apparatus comprising:
a lens;
an actuator structured to position the lens;
a Hall element having a first end grounded and structured to generate a position detection signal that indicates a position of the lens;
a current source coupled to a second end of the Hall element and structured to supply a constant current having predetermined current amount;
a temperature detection unit coupled to the second end of the Hall element and receiving a voltage at the second end of the Hall element, and structured to detect a temperature based on a voltage at the second end of the Hall element in a state in which the constant current is flowing through the Hall element; and
a control unit structured to control the actuator such that the position detection signal approaches a position instruction signal that indicates a target position of the lens.