Reflective Module Ball Bearing Rotation Mechanism
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Solution Overview
Problem
Existing camera modules with autofocusing, zoom, and image stabilization functions face challenges in accurately rotating reflective members due to complex structures and limited space, making it difficult to implement these features in portable electronic devices without increasing device thickness.
Innovation Solution
A camera module design featuring a reflective module with a rotation plate and movable holder supported by ball members and guide grooves, allowing for precise rotation of the reflective member in two axes, enabling accurate light reflection and stabilization while minimizing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a complex structure is used to implement rotation of the reflective member, then rotation accuracy may be improved, but device complexity increases and space requirements increase
Solution Approach 1:
The rotation mechanism is divided into two independent single-axis rotation systems instead of one complex two-axis system. The rotation plate rotates about a first axis while the movable holder rotates about a second axis, allowing each component to be simpler and more manageable while achieving the overall rotation function
Solution Approach 2:
Ball members are used as spherical elements to facilitate smooth rotation between the rotation plate and movable holder. The spherical shape of the ball members enables precise rotational movement with reduced friction and wear, improving rotation accuracy without requiring complex mechanical structures
2Measurement precision
If a complex structure is used to implement rotation of the reflective member, then rotation accuracy may be improved, but the available space is exceeded
Solution Approach 1:
The movable holder is nested within the rotation plate, and the ball members are positioned in gaps between these components. This nested arrangement allows the rotation mechanism to be compact while maintaining the necessary degrees of freedom for accurate reflection positioning
Solution Approach 2:
The two-axis rotation system utilizes perpendicular axes (first axis and second axis) to achieve rotation in multiple dimensions. This dimensional approach allows compact positioning of the reflective member without requiring linear space extensions in a single direction
3Volume of moving object
If the reflective member rotation is implemented in limited space, then device compactness is improved, but rotation accuracy deteriorates
Solution Approach 1:
The pulling yoke and pulling magnet system replaces traditional mechanical connection methods. The magnetic attraction force enables precise positioning and controlled rotation of the movable holder relative to the rotation plate, achieving high rotation accuracy in a compact space without complex mechanical linkages
Solution Approach 2:
Ball members provide spherical contact surfaces that enable precise rotational movement in confined spaces. The spherical geometry allows for accurate angular positioning while maintaining a compact footprint, resolving the conflict between device size and rotation precision
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 enables accurate rotation of the reflective member, effectively implementing autofocusing and zoom functions while reducing the size of portable electronic devices and minimizing power consumption for image stabilization, thus maintaining a compact device form factor.
Implementation Method 1
The ball members are inserted into and three-point supported by the guide grooves
Implementation Method 2
The housing may include one of a pulling yoke or a pulling magnet and the movable holder may include the other of the pulling yoke or the pulling magnet, and the movable holder and the rotation plate may be supported by the internal wall of the housing by attractive force produced between the pulling yoke and the pulling magnet
Data Source
AI summary
A reflective module includes a rotation plate supported by an internal wall of a housing; and a movable holder supported by the rotation plate and including a reflective member. The movable holder moves the reflective member in a first axis direction perpendicular to an optical axis and in a second axis direction perpendicular to the optical axis and the first axis direction. At least two ball members aligned in the first axis direction are disposed in at least one of a first gap between the housing and the rotation plate and a second gap between the rotation plate and the movable holder. A guide groove is disposed in the rotation plate and in at least one of the housing and the movable holder, and the ball members are inserted into the guide grooves. The ball members are inserted into and three-point supported by the guide grooves.