US 11,796,348 B2
Optical driving mechanism
Shou-Jen Liu, Taoyuan (TW); Chao-Chun Chang, Taoyuan (TW); Sin-Hong Lin, Taoyuan (TW); and Wei-Cheng Wang, Taoyuan (TW)
Assigned to TDK TAIWAN CORP., Taoyuan (TW)
Filed by TDK TAIWAN CORP., Taoyuan (TW)
Filed on May 10, 2019, as Appl. No. 16/408,871.
Claims priority of provisional application 62/670,580, filed on May 11, 2018.
Claims priority of application No. 201910371090.8 (CN), filed on May 6, 2019.
Prior Publication US 2019/0346284 A1, Nov. 14, 2019
Int. Cl. G02B 7/09 (2021.01); G01D 5/14 (2006.01); G02B 27/64 (2006.01); G03B 5/00 (2021.01); G03B 13/36 (2021.01)
CPC G01D 5/145 (2013.01) [G02B 7/09 (2013.01); G02B 27/646 (2013.01); G03B 5/00 (2013.01); G03B 13/36 (2013.01); G03B 2205/0007 (2013.01); G03B 2205/0046 (2013.01); G03B 2205/0069 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical driving mechanism configured to drive an optical element, comprising:
a fixed portion, comprising a circuit board with a circuit board surface;
a movable portion, movably connected to the fixed portion, and the movable portion includes a holder, wherein the holder is configured to sustain an optical element;
a driving assembly, configured to drive the movable portion to move relative to the fixed portion, comprising a coil surrounding the holder; and
a position sensing assembly, configured to sense a moving distance of the movable portion relative to the fixed portion, and the position sensing assembly includes a sensing magnetic element and a sensor, wherein the sensing magnetic element is disposed on the movable portion and has a rectangular structure, the sensor is disposed on the circuit board surface,
wherein a long axis direction of the rectangular structure extends in a direction that is perpendicular to an optical axis direction of the optical element, and the long axis direction is different from the optical axis direction,
wherein the circuit board surface is parallel to the optical axis direction, and the sensing magnetic element at least partially overlaps the sensor when viewed along a normal vector of the circuit board surface, and
wherein the holder has a recess recessed toward the optical axis, the recess has a groove portion and a sidewall, the sensing magnetic element is disposed in the recess, the sensing magnetic element forms a gap with the sidewall of the recess, the groove portion has a space between the sensing magnetic element and the sidewall of the recess, and the groove portion is configured to contain an adhesive, wherein the gap and the space are positioned at different sides of the sensing magnetic element that are perpendicular, the groove portion is surrounded by the coil, the sensing magnetic element, and the sidewall of the recess.