Sheet-Shaped Coil Attachment in Optical Shake Correction
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Solution Overview
Problem
Conventional optical units with sheet-shaped coils for shake correction face challenges in stable attachment and high adhesive strength due to the coils' rigidity and shape instability, leading to complex fixing processes and reduced attachment strength.
Innovation Solution
The optical device incorporates a flexible printed circuit board with a coil attaching part that is thinner and narrower than the sheet-shaped coil, allowing for easier handling and stabilization, with a gap space utilized as an adhesive reservoir to enhance attachment strength, and includes protruded parts to maintain coil alignment and prevent inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the sheet-shaped coil is made with relatively large thickness to provide rigidity, then the coil structure is more stable, but the shape stability deteriorates when bent into a rectangular tube shape
Solution Approach 1:
The sheet-shaped coil is divided into multiple coil parts connected by bent portions, allowing each segment to be optimized independently. The coil parts can be made thicker for rigidity while the bent portions provide flexibility for shaping into a rectangular tube without compromising overall shape stability.
Solution Approach 2:
The patent uses a sheet-shaped coil that can be bent into a rectangular tube shape to fit the inner peripheral face of the upper cover. By optimizing the thickness and material properties, the coil maintains both rigidity for structural stability and flexibility for conforming to the housing shape.
2Ease of manufacture
If the sheet-shaped coil is bent into a rectangular tube shape to fit the inner peripheral face, then the coil can be attached to the housing, but the shape becomes unstable during attachment
Solution Approach 1:
The sheet-shaped coil is pre-bent into a rectangular tube shape that matches the inner peripheral face of the upper cover before attachment. This preliminary shaping ensures that the coil conforms to the housing geometry, facilitating easier attachment while maintaining shape stability during the fixing process through proper structural design.
3Ease of manufacture
If adhesive is applied to the inner peripheral face of the upper cover for attachment, then the coil can be fixed, but the adhesive is scraped by the rigid sheet-shaped coil reducing attachment strength
Solution Approach 1:
The sheet-shaped coil is designed with optimized thickness and material properties that allow it to conform to the inner peripheral face without being excessively rigid. This flexibility prevents the coil from scraping away the adhesive during attachment while maintaining sufficient structural integrity for strong bonding.
4Strength
If the sheet-shaped coil is made thicker for rigidity, then the coil structure is more stable, but the attachment process becomes more complex
Solution Approach 1:
The sheet-shaped coil is segmented into multiple coil parts with specific thickness optimizations. This segmentation allows each part to achieve necessary rigidity while the overall structure remains manageable and easy to attach to the housing, reducing the complexity of the fixing process.
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 simplifies the attachment process of sheet-shaped coils, increases their attachment strength to the holding part, and maintains the gap space between the coil and the drive magnet, ensuring effective shake correction and image quality.
Implementation Method 1
a sheet-shaped coil which is integrally provided with a coil part
Data Source
AI summary
An optical device may include a movable part including a lens; a holding part to hold the movable part; and a drive mechanism to drive the movable part. The holding part may include a case body. The drive mechanism may include a plurality of drive magnets; a plurality of sheet-shaped coils including a coil part; and a flexible printed circuit board including a coil attaching part. A plurality of the sheet-shaped coils may be attached to one face of the coil attaching part. A thickness of the coil attaching part is thinner than the sheet-shaped coil. A width of the coil attaching part may be narrower than a width of the sheet-shaped coil.