Lens Holder Multi-Point Support for Tilt-Stable Optical Axis Motion
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Solution Overview
Problem
Existing optical element driving devices struggle to stably support lenses with increased size and weight due to the conventional support structure at adjacent corner portions, leading to potential inclination and instability.
Innovation Solution
The optical element driving device employs a holding part surrounded by a housing part with multiple contact points at least three locations in the circumferential direction, using supporting parts with ball members to press inward, ensuring stable movement along the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ball members are disposed at adjacent two corner portions of the base to support the lens holder, then the device complexity is reduced, but the lens becomes inclined and cannot be stably supported when the size and weight of the lens increase
Solution Approach 1:
The support structure is segmented into multiple independent contact parts distributed at different locations (at least three locations in circumferential direction) within the housing part. Each contact part independently supports the holding part, distributing the load and preventing inclination. This segmentation allows the system to handle increased lens weight and size while maintaining stability.
Solution Approach 2:
The support configuration transitions from a two-point support (adjacent corners) to a multi-point support distributed in the circumferential dimension. By adding contact parts at least at three locations in the circumferential direction, the support system gains dimensional distribution that prevents rotational instability and lens inclination.
2Manufacturing precision
If the size and weight of the lens increase to improve image quality, then the image capturing capability is improved, but the lens cannot be stably supported in a movable manner
Solution Approach 1:
Multiple contact parts are positioned to distribute the weight load of the increased-size lens across different locations within the housing part. This weight distribution prevents concentration of force at single points, maintaining stable support and preventing inclination even as lens mass increases for improved image quality.
Solution Approach 2:
Each contact part is locally positioned at specific locations (at least three in circumferential direction) to provide targeted support where needed. This localized support arrangement ensures that each region of the holding part receives appropriate support force, preventing differential settlement or inclination that would occur with uniform or single-point support.
3Reliability
If contact parts press the holding part toward inside of the opening, then the lens is constrained in position, but the movement along the optical axis is restricted
Solution Approach 1:
The contact parts are designed to dynamically balance constraint and movement freedom. They press the holding part toward the inside of the opening to prevent radial deviation and inclination, while their strategic positioning and arrangement allow longitudinal movement along the optical axis. This dynamic configuration enables the lens to move freely for focusing while maintaining positional accuracy and preventing tilt.
Data Source
AI summary
This optical element driving device (1) for driving an optical element comprises: a retaining part (10) having an opening that surrounds the outer periphery of an optical element and is capable of retaining the optical element; an accommodating part (20) for accommodating the retaining part in the inside thereof; and support parts (40A) having a plurality of contact parts (31) that come in contact with the retaining part in at least three positions distributed in the circumferential direction inside the accommodating part, the support parts (40A) supporting the retaining part so as to be able to move in an optical axis direction while the retaining part is pressed toward the inside of the opening by the plurality of contact parts.