Reflector Actuator With Ball Guide for Precise Multi-Axis Rotation
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Solution Overview
Problem
Conventional actuators for reflectors in camera modules face reduced driving precision due to mutual magnetic forces between magnets and weakened adhesion forces, leading to dynamic posture and position changes of moving elements during rotational movement.
Innovation Solution
An actuator design featuring a carrier with perpendicular magnets, a ball guide, and a housing with a yoke plate to generate attractive forces, allowing for independent rotational movement in multiple directions while minimizing magnetic interference and enhancing adhesion forces through a single yoke and ball system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple moving elements with magnets are used for independent rotation in each direction, then the actuator can achieve multi-directional movement, but mutual magnetic forces between magnets cause dynamic posture and position changes, reducing driving precision
Solution Approach 1:
The patent merges multiple moving elements into a single integrated carrier structure. Instead of having separate moving elements for different rotation directions, the patent combines them into one carrier that can rotate in multiple directions, eliminating the mutual magnetic interference between separate magnets while maintaining multi-directional movement capability
Solution Approach 2:
The carrier is designed as a universal moving element that performs multiple functions - it can rotate in multiple directions (first direction and second direction perpendicular to the first) while being driven by a single magnet-coil interaction system, thereby eliminating the need for multiple independent moving elements with their own magnets
2Reliability
If a yoke made of magnetic material is provided to generate attractive force with the magnet to maintain contact force with the ball, then the moving element can be supported during rotational movement, but the yoke structure increases device complexity and the attractive force may be weakened due to mutual interference of magnetic forces
Solution Approach 1:
The patent extracts and eliminates the magnetic yoke structure from the system. Instead of using a magnetic material yoke to generate attractive force with the magnet, the patent employs a non-magnetic support structure that physically guides and supports the carrier's rotational movement without interfering with the magnetic field or requiring magnetic attraction
Solution Approach 2:
The patent introduces a non-magnetic intermediary support structure (such as a guide rail or mechanical support) that mediates between the carrier and the ball, providing physical support and guidance during rotational movement without requiring magnetic attraction, thereby eliminating the need for magnetic yoke structures
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
The design improves driving precision and structural simplicity by reducing magnetic interference and maximizing attractive force efficiency, enabling efficient rotation in multiple directions without increasing device thickness.
Implementation Method 1
a ball guide configured to support rotational movement of the carrier in a first direction; a first ball placed between the carrier and the ball guide
Implementation Method 2
a yoke plate provided in the housing and configured to generate an attractive force with the second magnet exposed through the first space
Data Source
AI summary
An actuator for a reflector. The actuator includes: a carrier at which a reflector is installed; first and second magnets installed at the carrier and placed in directions perpendicular to each other, a ball guide configured to support rotational movement of the carrier in a first direction; a first ball placed between the carrier and the ball guide; a housing configured to support rotational movement of the ball guide in a second direction perpendicular to the first direction; and a second ball placed between the ball guide and the housing.