Lens Driving Device Spring Offset Stabilization
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Solution Overview
Problem
The existing lens driving devices for miniaturized cameras suffer from instability in the posture of the lens holder due to the elastic deformation of spring members, which causes the lens holder to rotate in the circumferential direction, leading to potential tilting away from the optical axis.
Innovation Solution
The design incorporates first and second spring members with offset connecting points in the circumferential direction, where the offset directions of these points are opposite for each spring member, allowing for controlled elastic deformation that stabilizes the lens holder's posture by ensuring it rotates in the same direction at both spring member positions, thereby maintaining alignment with the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the elastic arms are arranged with offset connecting points in the circumferential direction to enable lens holder movement, then the lens holder can move along the optical axis, but the lens holder rotates in the circumferential direction causing unstable posture
Solution Approach 1:
The patent applies asymmetry by arranging the connecting points of the elastic arms with opposite offset directions on either side of the optical axis. The first elastic arm has its second connecting point offset in one circumferential direction, while the second elastic arm has its second connecting point offset in the opposite circumferential direction. This asymmetric configuration ensures that when the lens holder moves along the optical axis, both elastic arms deform in a way that produces rotational moments in the same direction, stabilizing the lens holder posture.
2Stability of the object's composition
If the spring members are made rigid to prevent rotation, then the lens holder posture is stable, but the lens holder cannot move freely along the optical axis
Solution Approach 1:
The patent applies dynamics by using elastic arms instead of rigid connections, allowing the lens holder to move freely along the optical axis. The elastic arms can deform dynamically during movement, accommodating the motion requirements. Simultaneously, the specific arrangement of connecting points with opposite offset directions ensures that the elastic deformation produces stabilizing rotational moments, achieving both movement freedom and posture stability.
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 configuration reduces the likelihood of the lens holder tilting, ensuring a stable posture and maintaining focus during movement along the optical axis, while also allowing for a lower profile design and reduced gap in the optical axis direction.
Implementation Method 1
the elastic arms follow the movement of the lens holder and are elastically deformed along the optical axis direction
Data Source
AI summary
The lens driving device includes: a housing, a lens holder, and first and second spring members that support the lens holder at both sides of the lens holder in an optical axis direction; wherein the first and second spring member each has a housing side fixing member fixed to the housing, a lens holder side fixing member fixed to the lens holder, and elastic arms therebetween. A first connecting point connecting the elastic arm with the housing side fixing member and a second connecting point connecting the elastic arm with the lens holder side fixing member are arranged offset to each other in a circumferential direction and an offset direction of the second connecting point to the first connecting point in the first spring member and an offset direction of the second connecting point to the first connecting point in the second spring member are opposite.