Lens drive apparatus
A lens driving device and lens technology, applied in the direction of installation, generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, etc., can solve problems such as bracket looseness, motor characteristic change, spring deformation, etc. Achieves the effect of preventing spring deformation, preventing changes in motor characteristics, and saving space
Inactive Publication Date: 2008-04-16
株式会社思考技研
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Problems solved by technology
[0003] However, in the prior art disclosed in the above-mentioned Patent Document 1, since the bracket is only supported on the outer cylinder by the spring, when a lateral force acts on the bracket, the bracket will be biased or loosened, and the spring will Deformation, which may change the characteristics of the motor
In addition, when a lateral force acts on the bracket and the position of the bracket deviates, the gap between the bracket and the outer cylinder cannot be kept constant. Sliding friction occurs between them, making it difficult for the bracket to move smoothly in the direction of the optical axis of the lens
Method used
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[0018] Embodiments of the present invention will be described in detail below with reference to the drawings. Fig. 1 is a longitudinal sectional view of the lens driving device of this embodiment, (a) is a sectional view showing the relationship between the front side spring and the outer cylinder part, and (b) is a sectional view showing the relationship between the rear side spring and the outer tube part, and (a) is drawn out by a dotted line. A cross-sectional view of the relationship between barrel parts. figure 2 It is a plan view of the front spring shown in FIG. 1 . image 3 It is a top view of the rear spring shown in FIG. 1 . Figure 4 It is an exploded perspective view of the lens driving device of this embodiment.
[0019] The lens driving device 1 of this embodiment is mounted on the autofocus lens of a mobile phone, and has: a substantially cylindrical yoke 3; an outer cylinder portion (base 5, frame 6) on which the yoke 3 is mounted; The bracket 7 on the inne...
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The lens driving device of the present invention has springs to support the bearer to the outer barrel, a coil and a magnet. The coil is powered to produce electromagnetic force for the bearer to move toward the optical axis of the lens; the springs are plate springs with ring top view; and locating parts are set in the bearer or the springs for locating the bearer and the outer barrel. The present invention makes it possible for the bearer to move toward the optical axis of the lens smoothly without deformation of the springs caused by the transverse deviation and loosing of the bearer and change of motor in characteristics.
Description
technical field [0001] The present invention relates to a lens driving device. Background technique [0002] Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2004-280031) discloses a lens driving device that moves a carriage in the direction of the optical axis of the lens by using electromagnetic force generated by energizing a coil, and has a substantially cylindrical yoke. iron, an outer cylinder on which a yoke is mounted, a bracket having a lens, a spring for supporting the bracket on the outer cylinder, a coil, and a magnet. [0003] However, in the prior art disclosed in the above-mentioned Patent Document 1, since the bracket is only supported on the outer cylinder by the spring, when a lateral force acts on the bracket, the bracket will be biased or loosened, and the spring will Deformation may change the characteristics of the motor. In addition, when a lateral force acts on the bracket and the position of the bracket deviates, the gap be...
Claims
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IPC IPC(8): G02B7/02
CPCH02N2/02G02B7/025G02B7/026G02B7/09G02B13/001G03B2205/0069
Inventor 白木学关口直树
Owner 株式会社思考技研