US 11,719,556 B2
Position detection device, camera module, and rotary actuator
Yongfu Cai, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Dec. 8, 2020, as Appl. No. 17/114,664.
Claims priority of application No. 2020-022389 (JP), filed on Feb. 13, 2020.
Prior Publication US 2021/0255000 A1, Aug. 19, 2021
Int. Cl. G01D 5/16 (2006.01); G02B 27/64 (2006.01); G02B 7/09 (2021.01); G03B 5/00 (2021.01); G03B 13/36 (2021.01); G03B 30/00 (2021.01); H04N 5/225 (2006.01); H04N 23/54 (2023.01); G01D 5/14 (2006.01); H02K 11/215 (2016.01)
CPC G01D 5/16 (2013.01) [G01D 5/147 (2013.01); G03B 30/00 (2021.01); H02K 11/215 (2016.01); H04N 23/54 (2023.01)] 15 Claims
OG exemplary drawing
 
1. A position detection device for detecting a position of an object whose position is variable, the position detection device comprising:
a magnetic field generator that generates a target magnetic field and is configured so that a direction of the target magnetic field at a detection position in a reference plane varies when the position of the object varies; and
a magnetic sensor that detects the target magnetic field and generates a detection signal corresponding to the direction of the target magnetic field, wherein
the magnetic field generator is configured so that a mode of variation of the direction of the target magnetic field relative to variations in the position of the object varies nonlinearly relative to the variations in the position of the object, and
the magnetic sensor is configured so that a mode of variation of the detection signal relative to variations in the direction of the target magnetic field varies nonlinearly relative to the variations in the direction of the target magnetic field.