Optical Unit Flexible Circuit Routing for Compact Shake Correction
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Solution Overview
Problem
Conventional optical units with shake correcting functions face challenges in assembly and downsizing due to the configuration of the rotation permitting structure, which is unsuitable for post-fitting of optical modules with flexible printed circuits and limits height reduction in the optical axis direction.
Innovation Solution
The optical unit features a movable body and a fixed body with orthogonalized flexible printed circuit fixing parts, allowing the rotation permitting structure to be arranged along the outer periphery of the fixed body, facilitating easy assembly and enabling downsizing by positioning the flexible printed circuit within the occupied region, with protruding fixing parts to prevent scraping and reduce reaction forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rotation permitting structure is arranged on the inside (optical axis center side) of the fixed body, then the shake correcting function is achieved, but the assembly process becomes difficult and height reduction is limited
Solution Approach 1:
The patent inverts the conventional arrangement by placing the rotation permitting structure on the outside of the fixed body rather than on the inside. This inversion allows the flexible printed circuit to be routed externally, making the assembly process simpler while enabling height reduction in the optical unit.
2Length of stationary object
If the flexible printed circuit is arranged conventionally inside the fixed body, then the structure is compact, but the height dimension cannot be reduced
Solution Approach 1:
The patent changes the spatial arrangement dimension by routing the flexible printed circuit in an external path around the outer periphery of the fixed body rather than through the internal optical axis region. This dimensional reorganization allows height reduction while maintaining circuit functionality.
3Ease of manufacture
If the movable body is rotatably fitted on the fixed body with post-fitted optical module, then the shake correction function is achieved, but the assembly process becomes complicated
Solution Approach 1:
The patent applies preliminary action by pre-arranging the rotation permitting structure on the fixed body before the optical module is fitted. This preliminary configuration of the external circuit routing simplifies the subsequent assembly process where the optical module is post-fitted onto the movable body.
Data Source
AI summary
A drive device is provided and includes: a movable body including an attachment part, to which an optical module is attached; a fixed body; and a support part rotatably supporting the movable body about an optical axis of the optical module attached to the attachment part with respect to the fixed body. The movable body includes a movable body-side fixing part, to which a flexible printed circuit pulled out of the optical module is fixed. The fixed body includes a fixed body-side fixing part, to which the flexible printed circuit is fixed. And, a portion between the movable body-side fixing part and the fixed body-side fixing part in a region along an outer periphery of the fixed body is set as a region drawn around in an attitude causing a thickness direction of the flexible printed circuit to be directions both orthogonal to a direction of the optical axis.