US 12,248,142 B2
Optical scanning device
Yuki Takahashi, Tokyo (JP); Masaharu Kagami, Tokyo (JP); and Yasutaka Kitamura, Tokyo (JP)
Assigned to MITSUMI ELECTRIC CO., LTD., Tokyo (JP); and DENSO CORPORATION, Aichi (JP)
Appl. No. 17/783,892
Filed by Yuki Takahashi, Tokyo (JP); Masaharu Kagami, Tokyo (JP); Yasutaka Kitamura, Tokyo (JP); and DENSO CORPORATION, Aichi (JP)
PCT Filed Dec. 11, 2020, PCT No. PCT/JP2020/046260
§ 371(c)(1), (2) Date Jun. 9, 2022,
PCT Pub. No. WO2021/117863, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 2019-225574 (JP), filed on Dec. 13, 2019.
Prior Publication US 2023/0026476 A1, Jan. 26, 2023
Int. Cl. G02B 26/10 (2006.01); G01B 11/26 (2006.01); H01F 7/08 (2006.01)
CPC G02B 26/105 (2013.01) [G01B 11/26 (2013.01); H01F 7/081 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An optical scanning device, comprising:
a shaft part to which a mirror is connected;
a movable magnet fixed to the shaft part;
a base;
a bearing that attaches the shaft part to the base rotatably;
a core unit including a core and a coil, the core unit configured to drive the movable magnet rotationally; and
a position holding member that attracts the movable magnet to a reference position magnetically, the position holding member being a magnetic material that is provided in the core unit and faces the movable magnet,
wherein:
the base includes a pair of wall parts each provided with a notched hole through which the shaft part is inserted via the bearing,
the core unit is disposed on a side of an outer surface of one wall part of the pair of the wall parts, and
an angle sensor part configured to detect a rotation angle position of the shaft part is disposed between the core unit and the one wall part.