Lens driving device

Abstract

The present invention provides a lens driving device capable of preventing excessive stress on the leaf spring supporting the lens holder by restricting excessive movement of the lens holder provided in the movable unit supported by the suspension wire. A support member (21) is provided in the movable unit (20) supported by the suspension wire (8), and the lens holder (30) provided inside the support member (21) is supported by the plate spring (40, 50) Axis movement freely. A bottom portion (27a), an optical axis cross-restricting portion (27b), and a rotation restricting portion (27c) are formed by a stopper recess (27) on the support member (21). Further, an upper stopper portion (46) is formed by a portion of the leaf spring (40). A restricting protrusion (35) is provided in the portion of the lens holder (30), and the restricting protrusion (35) is inserted into the stopper recess (27).

Description

technical field [0001] The present invention relates to a lens driving device provided with a movable unit and a lens holder, the movable unit is supported by a suspension wire and moves in a direction crossing the optical axis, and the lens holder is supported in the movable unit as It can move freely along the optical axis direction, and in particular, the present invention relates to a lens driving device capable of restricting excessive movement of a lens holder in a movable unit. Background technique [0002] Patent Document 1 describes an invention related to a lens driving device. [0003] In the lens driving device described in Patent Document 1, the first holder is provided inside the second holder, and the lens holder is provided on the first holder. An upper leaf spring and a lower leaf spring are fixed to the second holder, and the first holder is supported by the leaf springs inside the second holder so as to be movable in the optical axis direction. In additi...

AI Technical Summary

Problems solved by technology

At this time, if the movement amount of the first holder along the optical axis direction is not restricted, excessive deformation force will act on the leaf spring, resulting in problems such as deformation of the leaf spring or deterioration of elastic properties.

[0009] However, in the lens driving device described in Patent Document 1, there is no restriction structure for restricting the large movement of the first holder having the lens holder in the optical axis direction.

[0010] According to the description in FIG. 12 and FIG. 13 of Patent Document 1, when the first holder moves downward, the first holder contacts the substrate, and when it moves upward, the first holder contacts the cover member. The movement of a holding body in the up and down direction is restricted

However, the base plate and the cover member are located away from the first holder, so with the configuration shown in Patent Document 1, it is difficult to restrict the first holder by an amount of movement that does not cause damage to the leaf spring.

[0011] In addition, in the lens driving device, when the first holder and the second holder move in a direction intersecting the optical axis, the relative position between the first holder having the lens holder and the cover member changes, Therefore, at this time, when the first holder moves largely in the direction away from the substrate, the first holder and the cover member do not contact uniformly but only partly, making it difficult to accurately restrict the upward movement of the first holder.

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