Lens Driving Device Radial Urging Member
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Solution Overview
Problem
Existing lens driving devices face inefficiencies in transmitting driving force from the actuator to the lens holder due to the placement of urging members on the driving force transmission path, leading to losses and vibrations that hinder proper force transmission.
Innovation Solution
The lens driving device positions the urging member to apply an urging force that rotates the lens holder towards the actuator, keeping a favorable contact state while keeping the urging member away from the driving force transmission path, ensuring efficient force transmission. This configuration includes a spring, arm member, substrate, and ball member to apply the urging force effectively without interfering with the actuator's force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the urging member is arranged between the lens holder and the actuator, then the lens holder and actuator can maintain contact, but the urging member is located on the driving force transmission path causing loss in force transmission
Solution Approach 1:
The urging member is repositioned from the optical axis direction (between lens holder and actuator) to the radial direction (at the corner of the lens holder). This spatial reconfiguration removes the urging member from the driving force transmission path while maintaining the necessary contact force between the actuator and lens holder through a different geometric arrangement.
2Reliability
If the urging member is arranged between the actuator and the securing part, then contact is maintained, but the urging member is substantially located on the driving force transmission path causing actuator vibration and force transmission loss
Solution Approach 1:
The urging member is relocated from the optical axis direction (where it would cause actuator vibration) to the radial direction at the corner of the lens holder. This dimensional shift allows the urging member to apply contact force without interfering with the actuator's driving force transmission path, thereby eliminating actuator vibration while maintaining reliable contact.
3Loss of energy
If the urging member is positioned away from the driving force transmission path, then force transmission efficiency is improved, but the contact state between lens holder and actuator may be compromised
Solution Approach 1:
The urging member is positioned asymmetrically at the corner of the lens holder rather than symmetrically on the optical axis. This asymmetric placement allows the urging member to apply radial contact force that maintains the contact state between the actuator and lens holder while being completely separated from the axial driving force transmission path, thus resolving the contradiction between force transmission efficiency and contact reliability.
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 solution enables efficient transmission of the driving force from the actuator to the lens holder, reducing friction and power consumption, and allowing for a larger lens holder size within a compact device, thus enabling the mounting of larger diameter lenses.
Implementation Method 1
The urging member comprises a spring, an arm member having one end in contact with the spring
Implementation Method 2
the ball member in contact with the substrate and lens holder is rotatable, frictions occurring between the ball member and the substrate and lens holder are very small
Data Source
AI summary
A lens driving device comprises a lens holder for holding a lens, a shaft for supporting the lens holder so as to make the lens holder movable in an optical axis direction of the lens and swingable about an axis of the shaft, an actuator for applying a driving force to the lens holder so as to move the lens holder in the optical axis direction; and an urging member for applying an urging force to the lens holder so as to rotate the lens holder toward the actuator. In the lens holder, a position where the urging force is applied by the urging member and a position where the driving force is applied by the actuator oppose each other, so that the urging force from the urging member is directed to the actuator.