Shake-Correction Holder Structure for Thin, Impact-Resistant Optical Units
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Solution Overview
Problem
Conventional optical units with shake correction functions in mobile devices face challenges in downsizing the holder while maintaining strength, leading to increased size and potential damage from excessive movement due to impacts.
Innovation Solution
The optical unit incorporates a metal and resin integrated holder with a magnetic material for the magnet fixing portion and a spherical body contact portion, allowing for reduced thickness and weight while preventing damage to other components during impacts, and simplifies the configuration by eliminating the need for a yoke member and thrust receiving member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the holder is made entirely of resin material, then the manufacturing cost is reduced and ease of manufacture is improved, but the strength and thickness of the holder must be increased to secure structural integrity, leading to increased device size
Solution Approach 1:
The holder is constructed as a composite structure with a resin main body and a metal reinforcement portion integrated into the resin. The metal portion is formed by insert molding a metal plate into the resin holder, creating a hybrid structure that combines the manufacturing ease of resin with the strength of metal, allowing thinning of the overall holder while maintaining structural integrity
2Strength
If the holder thickness in the radial direction of the camera module is increased to secure strength, then the structural integrity is improved, but the holder becomes larger in the radial direction, causing the optical unit to increase in size
Solution Approach 1:
The holder uses a composite structure where a metal plate is insert-molded into the resin holder to create a reinforcement portion. This metal reinforcement provides high strength and rigidity in critical areas, allowing the overall holder thickness to be reduced while maintaining sufficient structural strength, thereby downsizing the optical unit
Solution Approach 2:
Instead of uniformly thickening the entire holder, the metal reinforcement portion is strategically placed only in specific areas where high strength is needed. The metal plate is positioned to reinforce the holder structure locally, providing maximum strength with minimum material addition, which prevents overall size increase
3Strength
If a yoke member and thrust receiving member are added to fix the spherical body to the resin holder, then the fixing strength is improved, but the device complexity and holder size increase
Solution Approach 1:
The metal reinforcement portion serves multiple functions simultaneously: it reinforces the holder structure, provides a mounting surface for the spherical body, and eliminates the need for separate yoke members and thrust receiving members. By combining these functions into a single integrated metal portion, the structure is simplified while maintaining fixing strength
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves a downsized holder with enhanced strength and lightness, preventing damage from excessive movement and simplifying the optical unit's configuration, thereby improving the overall compactness and reliability of the shake correction function.
Implementation Method 1
The shake correction drive mechanism includes a driving magnet to be fixed to the holder frame, and a driving coil to be fixed to the fixed body
Implementation Method 2
The holder is structured of a metal portion formed of a metal material, and a resin portion formed of a resin material and integrated with the metal portion by insert molding
Data Source
AI summary
In an optical unit with a shake correction function, a frame-shaped holder to which a camera module is fixed to an inner periphery being structured of a metal portion formed of a metal material, and a resin portion formed of a resin material and integrated with the metal portion by insert molding. The metal portion includes magnet fixing portions formed of a magnetic material and to which a driving magnet is fixed, and spherical body contact portions in contact with a spherical body made of metal and serving as a fulcrum for pivotal movement of the holder.