Camera Module Stiffener Grounding for Static Dissipation
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Solution Overview
Problem
Camera modules are susceptible to performance degradation due to static electricity, which affects their operational efficiency.
Innovation Solution
A camera module design incorporating a stiffener with a conductive adhesive and insulative coating to prevent static interference, where the stiffener supports the circuit board and lens module while being grounded to mitigate electrical shorts and enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stiffener is added to support the camera module, then structural support is improved, but static electricity accumulation increases
Solution Approach 1:
The stiffener, which normally accumulates static electricity, is converted into a beneficial component by applying a conductive coating. This coating transforms the harmful static charge into a controlled electrical pathway that dissipates charge to ground, turning the stiffener from a hazard into part of the electrostatic protection system.
Solution Approach 2:
A conductive coating is introduced as an intermediary layer between the stiffener and the ground. This coating acts as a mediator that provides a controlled electrical pathway, allowing the stiffener to be grounded without direct metal-to-metal contact, thus preventing static accumulation while maintaining structural support.
2Reliability
If the stiffener is grounded to prevent static interference, then electrostatic protection is improved, but risk of short circuit increases
Solution Approach 1:
The conductive coating is applied selectively only to the portions of the stiffener that require grounding for electrostatic protection, rather than making the entire stiffener conductive. This localized approach provides ESD protection where needed while maintaining insulation properties in other areas to prevent short circuits.
Solution Approach 2:
The stiffener is constructed as a composite structure combining insulative material with a conductive coating layer. This composite design integrates both the electrical insulation properties of the base material and the conductive properties of the coating, enabling simultaneous ESD protection and short circuit prevention.
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 solution effectively reduces the impact of static electricity on camera module performance by grounding the stiffener and preventing electrical shorts, thereby maintaining the reliability and efficiency of the camera module.
Implementation Method 1
a conductive adhesive 40 is located on the bottom plate 31 of the stiffener 30 and located under the circuit board 20
Implementation Method 2
An insulative coating 320 is coated on inside surface of each sidewall 32. The insulative coating 320 can avoid short circuit between the lens module 10 and other units of the camera module 100
Data Source
AI summary
A camera module includes an image sensor, a circuit board, and a stiffener. The stiffener is located one side of the circuit board and includes a bottom plate grounded. The image sensor is located on another side of the circuit board. The stiffener includes a sidewall extending from the bottom plate. The sidewall and the bottom plate cooperatively hold the circuit board. An insulative coating is coated on the sidewall to avoid short circuiting.