Optical Unit Flexible Wiring Board Shake Correction
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Solution Overview
Problem
Existing optical units for cell phones with camera shake correction require a large space due to the curvature of flexible wiring boards, which increases the optical axis dimension and applies unnecessary load to the movable body.
Innovation Solution
The optical unit incorporates a flexible wiring board with a bent part extending from the movable body to the fixed body, where the swing support point is located between the bent and fixed parts, allowing the movable body to swing with minimal load application, thus reducing the space required and maintaining optical axis stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the flexible wiring board is curved in a 'C'-character shape to reduce load on the movable body, then the load applied to the movable body is reduced, but a large space is required on the rear side in the optical axis direction
Solution Approach 1:
The flexible wiring board is configured to extend in a direction substantially perpendicular to the optical axis direction, utilizing a different spatial dimension. This allows the wiring board to connect the movable body to the outside without requiring excessive space in the optical axis direction, thereby resolving the contradiction between reducing load and maintaining compact dimensions.
Solution Approach 2:
The flexible wiring board has different configurations in different regions: a first flexible wiring board portion that extends substantially perpendicular to the optical axis, and a second flexible wiring board portion that extends substantially parallel to the optical axis. This localized differentiation allows the wiring board to minimize its impact on the optical axis dimension while still providing necessary electrical connections and accommodating movement.
2Force
If the flexible wiring board is extended longer to reduce load on the movable body, then the load is reduced, but the optical unit becomes larger
Solution Approach 1:
The flexible wiring board extends primarily in a direction perpendicular to the optical axis rather than extending longer along the optical axis direction. This dimensional change allows the wiring board to achieve sufficient length for reducing load while keeping the optical unit compact in its primary dimension.
Solution Approach 2:
The flexible wiring board is designed to be flexible and capable of deformation, allowing it to accommodate the swinging motion of the movable body. This dynamic flexibility enables the wiring board to maintain electrical connections without requiring excessive length or rigid structural support, thereby reducing the overall volume of the optical unit.
Data Source
AI summary
The purpose of the present invention is to provide an optical unit with camera-shake correction function capable of minimizing the load applied to a movable element from a flexible wiring substrate even when the movable element is oscillated, in order to correct camera shake. In an optical unit provided with a camera-shake correction function, a movable element can be oscillated about an oscillation support point by actuating a drive mechanism for camera-shake correction, and camera shake can therefore be corrected. In a flexible wiring substrate drawn out from the movable element, a folded part folded along the rear end portion of the movable element in the optical axis direction is formed in a drawn-out portion from the movable element, and in the optical axis direction, the oscillation support point is positioned between the surface of the folded part that faces the end part on the other side −Y in the Y-axis direction of the rear end portion of the movable element in the optical axis direction, and the surface that faces toward the rear in the optical axis direction at a fixed part of the flexible wiring substrate with respect to a fixed body.