Image dither correction device
A shake correction and image technology, which is applied in the field of image shake correction devices, can solve problems such as shaking of movable parts, increased power consumption, gravity exceeding magnetic holding force, etc., and achieves the effects of reducing the number of parts, reducing power consumption, and simplifying the structure
Active Publication Date: 2012-10-17
COPAL CO LTD
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[0003] However, since in this position, the movable part is held in a centered rest position by means of the magnetic holding force, once the impact force exceeds the magnetic holding force when receiving an external impact, the movable part may be damaged. Shaking, or once the device is placed in a position where gravity always acts in a direction crossing the optical axis, may cause gravity to override the magnetic retention force and hold the movable part in a position deviated from its original rest position
[0004] On the other hand, once the reset magnet and the driving magnet are increased to obtain a magnetic holding force sufficient to resist gravity or external impact, it will lead to an increase in the size of the device and increase the weight of the movable parts, making it difficult to achieve smooth operation. image correction, or cause an increase in power consumption, etc.
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[0089] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0090] A camera module U equipped with the image shake correction device M is as follows figure 1 As shown, a camera body 1 on which an imaging element and the like are arranged, a lens barrel 2 as an imaging lens unit connected to the camera body 1 , and the like are provided. Further, in the lens barrel 2, an image shake correction device M is mounted as one of a plurality of lens groups reciprocating in the optical axis direction.
[0091] Image shake correction device M such as figure 2 As shown, it is equipped with a base 10 as a fixed part, three spheres 20 as a supporting mechanism, a movable part 30 holding a lens G, a cover part 40 as a fixed part, and a first driving member as a driving member for driving the movable part 30. The driving mechanism 50 (the first permanent magnet 51 (a pair of permanent magnets 51a, 51b), the first coil 52 (a pair of coils 52...
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The invention provides an image dither correction device, which can retain a correction lens in an immovable way in a dormant state and meanwhile achieve a simplified and small-sized structure. The image dither correction device comprises a base with an opening part marking a central shaft, a movable part retaining the lens and movable relative to the base, a support mechanism supporting the movable part in a way to freely move in a plane perpendicular to the optical axis of the lens, a drive component driving the movable part in the plane, and a retaining component for retaining in a way to make the movable part positioned on a predetermined dormant position. The retaining component comprises a rotary driving mechanism (a pair of permanent magnets and a pair of coils) making the movable part rotate around the optical axis before an image dither correction, and a clamping stop mechanism for making the movable part clamped with a part of the base on a predetermined rotary position and then stopped. In this way, the lens and the movable part can be reliably retained in a way to be positioned on the dormant position in a dormant state.
Description
technical field [0001] The present invention relates to an image shake correction device mounted in a digital camera or the like. Background technique [0002] As a conventional image shake correction device, there is known a device that includes a substantially rectangular base having an opening in the center, holds the lens, and is movably supported relative to the base in a plane perpendicular to the optical axis. The movable part, the support mechanism that supports the movable member to move freely relative to the base, the drive mechanism that drives the movable part in a plane perpendicular to the optical axis, the position detection member that detects the position of the movable part, and the rest In this state, the center of the lens is reset to a (centering) position consistent with the center of the opening. As a reset member, it faces the driving magnet fixed in the base to generate a magnetic force to return to the rest position. In the movable part, the reset...
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IPC IPC(8): G03B5/00G02B27/64G02B7/02H04N5/232
Inventor 井上大
Owner COPAL CO LTD