Actuator Inner Frame Roughness for Accurate Optical Inspection
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Solution Overview
Problem
The existing actuator inspection methods face inaccuracies due to light interference from materials with high reflectance, leading to incorrect identification of defective connection members, especially when using certain materials for the inner frame part.
Innovation Solution
The actuator design incorporates an inner frame part made of materials like brass or stainless steel with specific surface roughness greater than 1.0 μm for brass and 0.1 μm for stainless steel, or resin, to reduce light reflectance and ensure accurate inspection by minimizing light interference, and a connection body with viscoelastic properties for effective adhesion and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If materials with high light reflectance (such as certain metals) are used for the inner frame part, then the aesthetic appearance and structural strength are improved, but light interference occurs during inspection causing inaccurate defect detection
Solution Approach 1:
The invention changes the surface roughness parameter of the inner frame part from smooth to rough (Ra≥0.1μm). This parameter modification reduces light reflectance and eliminates interference patterns during optical inspection, allowing accurate defect detection while maintaining metal materials for structural integrity
Solution Approach 2:
The invention applies different surface qualities to different parts: the inner frame part has a rough surface (Ra≥0.1μm) to reduce light reflection, while other components maintain their original surface qualities. This localized quality change solves the inspection problem without compromising overall structural performance
2Reliability
If the surface roughness of the inner frame part is increased to reduce light reflectance, then inspection accuracy is improved, but the adhesion of the connection body to the inner frame part may be compromised
Solution Approach 1:
The invention optimizes the surface roughness parameter to a specific range (Ra≥0.1μm and Ra≤3.2μm). This controlled parameter change reduces light reflection for inspection while maintaining sufficient surface area and mechanical interlocking for adequate adhesion of the connection body
Solution Approach 2:
The invention specifies a numerical range for surface roughness (0.1μm≤Ra≤3.2μm) that simultaneously satisfies both inspection accuracy requirements (by reducing light reflection) and adhesion requirements (by maintaining sufficient bonding surface area). This dual-optimized parameter range resolves the contradiction between inspection and adhesion
3Ease of manufacture
If the inner frame part is made of metal materials like brass or stainless steel, then structural strength and cost-effectiveness are improved, but light reflectance increases causing inspection interference
Solution Approach 1:
The invention changes the surface roughness parameter of metal inner frame parts to Ra≥0.1μm, which reduces light reflectance and eliminates inspection interference while maintaining the cost-effectiveness and structural advantages of metal materials like brass and stainless steel
Solution Approach 2:
The invention applies surface roughness treatment specifically to the outer peripheral face of the inner frame part that is visible during inspection. This localized quality change reduces light reflection in the inspection area while maintaining the overall structural integrity and cost-effectiveness of metal materials
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 approach allows for accurate inspection of connection members by reducing light interference and ensuring proper adhesion, thereby enhancing the reliability of the actuator's connection member inspection process while maintaining cost-effectiveness.
Implementation Method 1
a connection body which is connected with the outer frame part and the inner frame part and is provided with at least one of elasticity and viscoelasticity
Implementation Method 2
arithmetic surface roughness of an outer peripheral face of the inner frame part is not less than 1.0 μm (micrometre)... reduce light reflectance and ensure accurate inspection by minimizing light interference
Data Source
AI summary
An actuator includes a support having a tubular case, a movable body having a shaft at a center of the case, a connection member connecting the support with the movable body, and a magnet and a coil structured to relatively move the movable body along the shaft with respect to the support. The connection member includes a ring-shaped inner frame having a through-hole to which the shaft is fitted, a ring-shaped outer frame which is held on an inner side of the case and is disposed on an outer peripheral side with respect to the inner frame, and a connection body which is connected with the outer frame and the inner frame and is provided with at least one of elasticity and viscoelasticity. The inner frame is made of brass, and arithmetic surface roughness of an outer face of the inner frame is not less than 1.0 μm.