Lens driving apparatus
a technology of driving apparatus and lens, which is applied in the direction of printers, cameras, instruments, etc., can solve the problems of difficult miniaturization of the lens driving apparatus, and achieve the effects of reducing the number of yokes, reducing the outer dimension, and enhancing the magnetic flux density of the magn
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first embodiment
[0030]A lens driving apparatus 1 is one that is incorporated into an autofocus lens for a cellular phone and includes a substantially U-shape (in cross-section) yoke 3, a base 5 to which the yoke 3 is attached, a frame 6 that supports the base 5, a cylindrical carrier 7 provided on an inner peripheral side of the yoke 3, a coil 10 provided on an outer peripheral side of the carrier 7, a front spring 9 provided at a front position in a direction of an optical axis of the carrier 7, and a back spring 11 provided at a back position in a direction of the optical axis of the carrier 7.
[0031]The base 5 is substantially square-shaped as viewed from the plane, and has a substantially flat base portion 5a and base-side connecting portions 5b formed at four corners of the base portion 5 in a standing condition. The base portion 5a has a circular opening hole 5c and engaging portion 5d that is engaged with engage projection portion 3e formed on the outer peripheral wall 3a of the yoke 3. The ...
second embodiment
[0043]FIG. 6 is a perspective view illustrating a yoke extracted from a lens driving apparatus ; and FIG. 7 is a plane view of the yoke illustrated in FIG. 6.
[0044]As illustrated in FIGS. 6 and 7, the outer peripheral wall 3a of the yoke 3 is substantially square-shaped as viewed from the plane, and the magnet 13, which is substantially triangularly shaped as viewed from the plane, is provided on each corner portion of the outer peripheral wall 3a. An inner peripheral surface 13a of each magnet 13 is substantially arc-shaped, and the spaces between the inner peripheral walls 3b and the inner peripheral surfaces 13a of the respective magnets 13 are equally formed.
[0045]In this embodiment, each magnet 13, which is substantially triangularly shaped as viewed from the plane, is fitted into the corner portion of the outer peripheral wall 3a of the yoke 3. Accordingly, in attaching the magnets 13 to the yoke 3, the magnets 13 can be positioned by only fitting the magnets 13 into the corne...
third embodiment
[0048]In the third embodiment, each magnet 13, which is substantially triangularly shaped as viewed from the plane, is fitted into the corner portion of the outer peripheral wall 3a, and an inner side wall 3g, which is arc-shaped as viewed from the plane, is provided on an edge 4a of the opening portion 4 where each magnet 13 opposes. Moreover, in connection with each magnet 13, one side 13c of the triangle abutting to the outer peripheral wall 3a is longer than the other side 13d and end portions 13e of adjacent two magnets 13 are abutted to each other.
[0049]Since each magnet 13 may not be placed at the base side portion, a space (D shown in FIG. 9) between the outer peripheral wall 3a and the edge 4a of the opening portion 4, which are positioned at the base side portion, can be made narrower than a space (C shown in FIG. 9) between the outer peripheral wall 3a and the inner side wall 3g, which are positioned at the base corner portion. As a result, the outer dimension of the base...
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Abstract
Description
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