Optical Unit Shake Correction Using Sheet-Shaped Coil
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Solution Overview
Problem
Existing optical units, such as those in cell phones, require significant assembly time and space to correct hand shake due to the need for multiple air-core coils positioned and electrically connected around the optical axis, which increases complexity and size.
Innovation Solution
An optical unit with a shake correcting function using a sheet-shaped coil extended in the circumferential direction, where permanent magnets are placed on the movable module and the coil parts are integrally connected, allowing for reduced assembly time and space by eliminating the need for separate coil positions and connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete air-core coils are used to correct hand shake in all directions, then shake correction capability is improved, but assembly time and device complexity increase due to multiple coils requiring separate positioning and electrical connection
Solution Approach 1:
Multiple discrete air-core coils are merged into a single sheet-shaped coil structure. The sheet-shaped coil integrates multiple coil windings in different directions within one continuous component, eliminating the need for separate positioning and electrical connection of multiple discrete coils while maintaining the capability to generate electromagnetic forces for shake correction in all directions
Solution Approach 2:
The sheet-shaped coil serves multiple functions simultaneously: it provides electromagnetic coupling with permanent magnets for shake correction, acts as a structural component between the movable and fixed bodies, and integrates multiple electrical connection points for different coil windings into a single component. This multi-functionality reduces the number of separate parts and simplifies assembly
2Reliability
If discrete air-core coils are positioned at multiple locations around the optical axis, then comprehensive shake correction is achieved, but the distance between movable and fixed bodies increases
Solution Approach 1:
The coil structure transitions from discrete point-like coils distributed radially around the optical axis to a sheet-shaped coil that extends in the circumferential direction. This dimensional change allows the coil to cover multiple angular positions while maintaining a compact radial profile, thereby reducing the distance between the movable and fixed bodies while achieving comprehensive shake correction coverage
3Reliability
If multiple discrete coils are electrically connected separately, then complete electromagnetic coupling is achieved, but assembly time increases
Solution Approach 1:
Multiple separate coil assembly operations are merged into a single assembly process. The sheet-shaped coil is installed as one integrated component, and its internal electrical connections are pre-established during manufacturing. This eliminates the need for separate positioning and electrical connection of multiple discrete coils, significantly reducing assembly time while maintaining complete electromagnetic coupling
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
The solution reduces assembly time and size by integrating coil parts with a terminal on a sheet-shaped coil, enabling efficient shake correction while minimizing the distance between the movable and fixed bodies, thus enhancing the optical unit's compactness and functionality.
Implementation Method 1
a shake correction drive mechanism which is structured to generate a drive force for swinging the movable module with respect to the fixed body. The shake correction drive mechanism includes a plurality of permanent magnets which are provided on an outer peripheral face of the movable module and a sheet-shaped coil which is extended in a circumferential direction in the fixed body and is integrally provided with a plurality of coil parts facing the permanent magnets
Data Source
AI summary
An optical unit may include a fixed body; a movable module which holds an optical element; and a shake correction drive mechanism which is structured to generate a drive force for swinging the movable module with respect to the fixed body. The shake correction drive mechanism may include a plurality of permanent magnets which are provided on an outer peripheral face of the movable module at positions separated in a circumferential direction around an optical axis of the optical element; and a sheet-shaped coil which is extended in a circumferential direction in the fixed body and is integrally provided with a plurality of coil parts facing the permanent magnets and a terminal part electrically connected with the coil parts.