US 9,810,969 B2
Lens driving apparatus
Takashi Tsuchiya, Nagano (JP); and Yasushi Takahashi, Tokyo (JP)
Assigned to EST Co., Ltd., Nagano (JP); and AULA-DIUS LLC., Osaka (JP)
Filed by EST Co., Ltd., Nagano (JP); and AULA-DIUS LLC., Osaka (JP)
Filed on Feb. 23, 2016, as Appl. No. 15/50,472.
Claims priority of application No. 2015-036401 (JP), filed on Feb. 26, 2015; and application No. 2015-003917 (JP), filed on Aug. 1, 2015.
Prior Publication US 2016/0252702 A1, Sep. 1, 2016
Int. Cl. G02B 7/02 (2006.01); G03B 13/34 (2006.01); G02B 7/08 (2006.01); G03B 3/10 (2006.01); G03B 5/00 (2006.01)
CPC G03B 13/34 (2013.01) [G02B 7/08 (2013.01); G03B 3/10 (2013.01); G03B 5/00 (2013.01); G03B 2205/0046 (2013.01); G03B 2205/0069 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A lens driving apparatus comprising:
a polygonal cylindrical bobbin that houses a lens;
a box-shaped cover that receives the bobbin;
a drive unit that moves the bobbin in an optical axis-direction of the lens; and
a support unit that supports the bobbin and guides the bobbin in the optical axis-direction, wherein
the drive unit is configured with a coil and a drive magnet,
the coil is mounted on at least one inner surface of inner surfaces of the cover, the drive magnet: is housed at a drive surface which is an outer surface of the bobbin and faces the coil; and has magnetic poles that are different at both sides in the optical axis-direction,
the support unit is configured with a plurality of first grooves, a plurality of second grooves and balls,
the plurality of first grooves are provided to at least two locations of an inner circumference of the cover, and extend in parallel with the optical axis-direction,
the plurality of second grooves extend in parallel with the optical axis-direction of the lens, and face respective ones of the plurality of first grooves, the number of the plurality of second grooves being the same as the number of the plurality of first grooves;
each of the balls is disposed between one of the plurality of first grooves and one of the plurality of second grooves facing the one of the plurality of first grooves,
the plurality of second grooves are provided to opposite corners of a support surface of the bobbin,
a detection magnet is mounted on the support surface of the bobbin that is substantially orthogonal to the drive surface, and
the plurality of first grooves are provided to opposite corners of a same support surface of the cover opposite the support surface of the bobbin,
whereby the support unit and the detection magnet are both provided on a same side of the bobbin which is substantially orthogonal to another side of the bobbin on which the drive unit is provided.