Lens Drive Device Flow Stopper for OIS Accuracy
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Solution Overview
Problem
The existing hand shake correction device experiences reduced accuracy due to the damper adhering to the stopper protrusion and inner surface of the cover, which creates resistance and affects the displacement of the OIS movable part during shake correction.
Innovation Solution
A lens driving device with a damper composed of viscous fluid that contacts the suspension wires, featuring a stopper protrusion on the light reception side with a flow stopper part to prevent the damper from adhering to the tip end surface, allowing for reduced resistance and improved shake correction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a damper is disposed to surround each suspension wire in the movable part, then generation of unnecessary resonance of each suspension wire is suppressed, but the damper may adhere to the tip end surface of the stopper protrusion and the inner surface of the cover, creating resistance to the displacement of the OIS movable part and reducing the accuracy of shake correction
Solution Approach 1:
The patent introduces a flow stopper part that extends in the optical axis direction (Z-direction) from the stopper protrusion. This adds a dimensional barrier perpendicular to the damper's natural flow direction, blocking the damper from reaching the tip end surface of the stopper protrusion and the inner surface of the cover, thereby preventing adhesion while maintaining resonance suppression.
2Device complexity
If the damper moves in the optical axis direction and adheres to the tip end surface of the stopper protrusion and the inner surface of the cover, then the adhered damper becomes a resistance to the displacement of the OIS movable part, but the flow stopper part is needed to stop the flow of the damper
Solution Approach 1:
The flow stopper part acts as an intermediary barrier between the damper and the critical surfaces (tip end surface of stopper protrusion and inner surface of cover). It intercepts the damper's flow in the optical axis direction, preventing direct contact and adhesion, thus maintaining shake correction accuracy without requiring complex additional mechanisms.
Data Source
AI summary
A lens drive device comprises: a fixing part disposed away from the movable part; a cover for covering the movable part in the direction of an optical axis; and suspension wires for supporting the movable part relative to the fixing part, one ends of the suspension wires being secured to the fixing part and the other ends being secured to the movable part. The movable part is configured so as to be provided with: a damper material disposed so as to come in contact with the suspension wires; a stopper protrusion provided near a portion of the light-receiving-side surface where the other ends of the suspension wires are secured, the tip end of the stopper protrusion facing the inner surface of the cover in the direction of the optical axis; and a flow-stopper part stopping a flow of the damper flowing.