Camera Actuator Welding at Magnetic Pole Boundary
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Solution Overview
Problem
Conventional actuator designs for cameras face challenges in maintaining the angular position accuracy of the outputting member relative to the rotor and suffer from degradation of magnetic characteristics due to welding, especially when the rotor and outputting member are jointed by welding.
Innovation Solution
The actuator design includes a coil for excitation, a stator with different magnetic poles, a rotor magnetized with circumferential magnetic poles, and an outputting member rotated in conjunction with the rotor, where the welding portion of the rotor is located at the boundary of the magnetic poles, minimizing magnetic characteristic degradation and improving positional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotor and outputting member are jointed by welding, then the strength and reliability of the connection is improved, but the magnetic characteristic of the rotor is degraded
Solution Approach 1:
The welding portion is specifically positioned at the boundary of magnetic poles where the magnetic flux density is low, creating a local quality difference that minimizes magnetic characteristic degradation while maintaining connection reliability
Solution Approach 2:
The invention converts the potentially harmful effect of welding on magnetic characteristics into a beneficial solution by strategically positioning the welding at the magnetic pole boundary, where it causes minimal interference with the magnetic field while still providing strong mechanical connection
2Ease of manufacture
If the rotor and outputting member are insert-molded, then the manufacturing ease is improved, but the positional accuracy of the outputting member relative to the rotor is degraded
Solution Approach 1:
The invention replaces the insert-molding process with a welding process, substituting a mechanical joining method with a thermal joining method that provides superior positional accuracy while maintaining manufacturing feasibility
Solution Approach 2:
The invention changes the joining method from insert-molding to welding, altering the manufacturing parameter to achieve better positional accuracy between the outputting member and rotor
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 enhances the positional accuracy of the outputting member relative to the rotor while suppressing magnetic characteristic degradation, ensuring high-performance operation even under high loads, such as fast shutter speeds.
Implementation Method 1
a coil for excitation; a stator excited with different magnetic poles by energization of the coil
Implementation Method 2
a rotor magnetized with different magnetic poles in a circumferential direction thereof, and rotated by a magnetic force generated between the rotor and the stator
Data Source
AI summary
An electromagnetic actuator includes; a coil for excitation; a stator excited with different magnetic poles by energization of the coil; a rotor magnetized with different magnetic poles in a circumferential direction thereof, and rotated by a magnetic force generated between the rotor and the stator; and an outputting member rotated in conjunction with the rotor and outputting rotational movement of the rotor to a first blade and a second blade. The rotor and the outputting member are jointed by welding and a welding portion of the rotor lies in a boundary of the magnetic poles thereof.