Camera Actuator Bobbin Structure for Optical Axis Alignment
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Solution Overview
Problem
Existing camera modules face issues with performance deterioration due to long movements of lenses, requiring improved optical axis alignment and enhanced coupling force between the lens holder and guiding unit, especially in ultra-slim and high-resolution cameras.
Innovation Solution
A camera actuator and module design featuring a bobbin with a lens holder and guiding unit connected by a bonding member, incorporating grooves and protrusions for precise alignment, and a driving unit to move the bobbin in the optical axis direction, ensuring efficient performance and angle correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens moves over a long distance for zoom or focus adjustment, then the zoom and focus ranges are improved, but the optical axis alignment deteriorates causing performance degradation
Solution Approach 1:
The guiding unit is divided into multiple guiding portions (first guiding portion, second guiding portion, third guiding portion) that guide the lens holder at different stages of movement. Each guiding portion provides precise alignment for specific movement ranges, ensuring optical axis alignment is maintained throughout the entire long movement distance for both zoom and focus adjustments.
Solution Approach 2:
Different guiding portions are positioned at different locations and orientations to provide localized guidance for specific movement segments. The first guiding portion guides in the optical axis direction, the second guiding portion guides in a direction intersecting the optical axis, and the third guiding portion provides additional constraint, creating locally optimized guidance for each stage of lens movement.
2Stability of the object's composition
If the lens holder and guiding unit are strongly coupled for stable movement, then the movement stability is improved, but the optical axis alignment becomes difficult to maintain
Solution Approach 1:
The coupling between lens holder and guiding unit is segmented into multiple guiding portions rather than a single rigid connection. This allows the lens holder to be stably coupled to the housing while maintaining degrees of freedom for precise alignment adjustment through the multi-stage guiding mechanism.
Solution Approach 2:
The guiding structure allows for adjustment of alignment parameters through the relative positions and orientations of the guiding portions. The first guiding portion constrains movement in the optical axis direction, while the second guiding portion at an intersecting angle provides adjustment capability for maintaining optical axis alignment during movement.
3Volume of moving object
If the camera module is made ultra-slim for compact design, then the compactness is improved, but the coupling force between lens holder and guiding unit decreases
Solution Approach 1:
The guiding unit extends in a direction intersecting the optical axis (second direction) to provide coupling force in a dimension perpendicular to the main movement direction. This allows the camera module to maintain ultra-slim profile in the optical axis direction while the guiding unit provides sufficient coupling force through its extended structure in the intersecting direction.
Solution Approach 2:
The guiding portions are strategically positioned and oriented to provide localized coupling forces where needed. The second guiding portion extending in the intersecting direction provides specific coupling force for stabilizing the lens holder during zoom movement, while maintaining overall compact dimensions.
Data Source
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AI summary
A camera actuator according to an embodiment of the present invention comprises: a housing; a first bobbin moving in an optical axis direction within the housing; and a drive unit moving the first bobbin. The first bobbin comprises: a first lens holder accommodating a lens; a guiding unit facing the housing; and a bonding member arranged between the first lens holder and the guiding unit.