Testing Tool for Panel Cover Residual Stress Detection
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Solution Overview
Problem
Metal panel covers in portable electronic devices often develop residual stress during manufacturing, leading to inward deformation and potential damage to liquid crystal panels, causing display quality issues like moire or hotspot problems.
Innovation Solution
A testing tool with a probe device and indicating system that simulates inward deformation by using a panel imitation member and conductive member to detect contact and prevent damage, allowing for structural enhancements or stress relief before assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal panel cover undergoes surface treatment processes (punching, milling), then appearance quality and functionality are improved, but residual stress accumulates causing inward deformation that may damage the liquid crystal panel
Solution Approach 1:
The patent applies preliminary action by performing the inward deformation test on the panel cover before it is assembled into the portable electronic apparatus. The testing tool simulates user pressing actions to detect inward deformation tendencies in advance, allowing manufacturers to identify and address residual stress issues before final assembly, thereby preventing potential damage to the liquid crystal panel while maintaining the beneficial surface treatment processes
Solution Approach 2:
The patent introduces an intermediary testing mechanism between the panel cover manufacturing process and the final assembly. The testing tool, with its probe device and indicating member, serves as an intermediary assessment system that evaluates the panel cover's resistance to inward deformation without requiring actual assembly with the liquid crystal panel, enabling safe detection of potential issues
2Ease of operation
If the panel cover is pressed during use, then user interaction functionality is enabled, but residual stress causes inward deformation generating drumbeat sound and potential panel damage
Solution Approach 1:
The testing tool performs preliminary assessment of the panel cover's resistance to inward deformation before the product reaches the user. By simulating pressing actions during manufacturing testing, the system identifies panel covers with excessive residual stress that would cause drumbeat sounds or damage during normal use, ensuring only reliable products are assembled and shipped
Solution Approach 2:
The testing tool provides immediate feedback through its indicating device (such as a flag or indicator) that shows whether the panel cover has excessive inward deformation tendency. This feedback mechanism allows manufacturers to sort and separate panel covers based on their resistance to pressing, ensuring that only those meeting reliability standards are assembled into final products
3Ease of manufacture
If residual stress is excessive in the panel cover, then manufacturing processes (punching, milling) have been completed, but the panel cover may collide with the liquid crystal panel causing moire or hotspot problems
Solution Approach 1:
The testing tool implements preliminary quality control by assessing inward deformation resistance immediately after surface treatment processes are completed, but before assembly with the liquid crystal panel. This timing allows manufacturers to detect and address residual stress issues while the panel cover is still separate, preventing display quality problems like moire or hotspot effects that would occur if defective panels were assembled
Solution Approach 2:
The testing tool serves as an intermediary quality gate between the manufacturing process and final assembly. It provides an assessment mechanism that determines whether the panel cover is suitable for assembly with the liquid crystal panel, ensuring manufacturing precision and display quality without requiring actual assembly of potentially defective components
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
Accurately determines the risk of inward deformation and enables users to prevent damage to liquid crystal panels by determining whether the panel cover has excessive residual stress, thereby improving display quality.
Implementation Method 1
The first elastic member is mounted on the probe and disposed between the limiting block and the conductive member for providing elastic force to drive the probe to the initial position
Implementation Method 2
The probe contacts with the conductive member to electrically conduct the indicating device when the test panel cover is sunken inward to contact with the panel imitation member
Data Source
AI summary
A testing tool includes a tool body, a panel imitation member disposed on the tool body, an indicating device, and a probe device. A test panel cover is detachably disposed on the tool body. The probe device is disposed in the panel imitation member and includes a probe and a conductive member disposed under the probe. The probe is elastically disposed through the panel imitation member between initial and triggering positions. When the probe is located at the initial position, the probe extends out from the panel imitation member to abut against the test panel cover. When the test panel cover is sunken inward to contact with the panel imitation member so as to drive the probe to the triggering position, the probe contacts with the conductive member to electrically conduct the indicating device.