Optical Unit Shake Correction Flexible PCB Curved Design

Solution Overview

Problem

Existing optical units with shake correction functions face challenges in reducing swing load and maintaining actuator stability due to the use of flexible printed circuit boards, which require labor-intensive folding and are prone to deformation, leading to increased swing load and actuator deterioration.

Innovation Solution

The optical unit incorporates a flexible printed circuit board with a flat face part curved in an imaginary plane, a wider fixable region on the fixed body, and a bending assist member to reduce labor and prevent deformation, allowing the board to be easily resiliently bent without folding, thus minimizing swing load and maintaining actuator stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the flexible printed circuit board is folded back multiple times to enable easy resilient bending, then the board can be easily bent, but the manufacturing process becomes complex and time-consuming

Engineering Contradiction:

Improveease of resilient bendingVSAvoidmanufacturing process complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The flexible printed circuit board is designed with a curved shape in its planar state, specifically with a curvature radius that allows easy resilient bending when the movable body swings. This curved configuration eliminates the need for multiple folds while maintaining the required flexibility and ease of bending operation.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Ease of operation

If the flexible printed circuit board is folded back multiple times, then the board can be easily resiliently bent, but the production time and labor increase significantly

Engineering Contradiction:

Improveease of resilient bendingVSAvoidproduction efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The flexible printed circuit board is designed with a curved shape in its planar state, specifically with a curvature radius that allows easy resilient bending when the movable body swings. This curved configuration eliminates the need for multiple folds while maintaining the required flexibility and ease of bending operation.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Reliability

If the flexible printed circuit board is forcibly fitted to a positioning part when the fixed end position deviates, then the board can be fixed, but propping or deformation occurs

Engineering Contradiction:

Improvefixing reliabilityVSAvoidboard shape accuracy

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The flexible printed circuit board is designed with a curved shape in its planar state, specifically with a curvature radius that allows easy resilient bending when the movable body swings. This curved configuration eliminates the need for multiple folds while maintaining the required flexibility and ease of bending operation.

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Ease of operation

If the flexible printed circuit board is provided with a curved shape, then easy resilient bending is achieved without folding, but additional manufacturing steps are required

Engineering Contradiction:

Improveease of resilient bendingVSAvoidmanufacturing simplicity

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The flexible printed circuit board is designed with a curved shape in its planar state, specifically with a curvature radius that allows easy resilient bending when the movable body swings. This curved configuration eliminates the need for multiple folds while maintaining the required flexibility and ease of bending operation.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 reduces the swing load on the movable body, decreases labor and time required for installation, and enhances actuator stability by allowing the flexible printed circuit board to be fixed in a natural state, preventing unintended forces from affecting the movable body and improving the accuracy of the optical unit's shake correction functionality.

Implementation Method 1

the movable body is swung while resiliently bending the flexible printed circuit board

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11747643B2Optical unit with shake correction function

Publication Date: 2023.09.05 SANKYO SEIKI MFG CO LTD

AI summary

An optical unit with a shake correction function includes a movable body, a fixed body, a swing support mechanism structured to swingably support the movable body, a shake correction drive mechanism structured to swing the movable body, and a flexible printed circuit board extended from the movable body. The flexible printed circuit board is provided with a flat face part between the movable body and a circuit board fixing part provided in the fixed body, and a fixed part which is fixed to the circuit board fixing part. The flat face part is provided with a curved part, the fixed part is positioned in the optical axis direction by abutting with the circuit board fixing part, the circuit board fixing part comprises a fixable region capable of fixing the fixed part, and a width of the fixable region is larger than a width of the fixed part.