Optical Module Shield Cushion for Consistent Cover Distance
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Solution Overview
Problem
Optical proximity sensors in electronic devices often experience measurement errors due to inconsistent air gaps between the cover and the shield, leading to interference and reduced product performance.
Innovation Solution
An optical module package structure and method that incorporates a cushion on the notch of the shield to maintain a constant distance between the cover and the shield, preventing interference and ensuring precise assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical proximity sensor is covered with a cover during assembly, then the sensor is protected, but an air gap between the cover and the shield is formed causing inconsistent distance and measurement errors
Solution Approach 1:
A cushion element is introduced as an intermediary component between the cover and the shield. This cushion fills the air gap and provides a consistent reference distance, allowing the cover to protect the sensor while maintaining accurate distance measurements through the cushion's known thickness and compressibility characteristics.
Solution Approach 2:
The cushion element is pre-installed on the shield before the cover is assembled. This beforehand cushioning ensures that when the cover is placed, the distance between the cover and shield is predetermined and consistent, eliminating measurement errors while still providing protection.
2Reliability
If the cover is assembled tightly to the optical proximity sensor, then protection is improved, but the cover cannot fit perfectly against the shield causing air gaps and measurement errors
Solution Approach 1:
The cushion element changes its physical parameters (compression, deformation) under applied force. When the cover is assembled, the cushion compresses to accommodate slight variations in assembly fit, maintaining consistent distance characteristics while absorbing manufacturing tolerances and preventing air gaps.
3Adaptability or versatility
If the distance between the cover and shield is inconsistent, then assembly flexibility is improved, but measurement errors occur reducing product performance
Solution Approach 1:
The cushion element provides self-adjusting functionality through its elastic properties. During assembly, the cushion automatically adjusts its compression level to maintain a consistent effective distance, eliminating the need for precise manual adjustment while ensuring measurement accuracy through the cushion's inherent elastic recovery characteristics.
Data Source
AI summary
The present disclosure discloses an optical module package structure and method thereof. The optical module includes a substrate, a shield, a photosensitive unit and a cover. The shield is disposed on the top of the substrate and forms a first housing space with the upper surface of the substrate. The photosensitive unit is disposed on the substrate and located in the first housing space. The shield has a light-receiving part above the photosensitive unit. At least one notch is on the outer surface of the shield. A cushion is disposed on the notch and protrudes on the upper surface of the shield. The cover is disposed on the cushion(s) and kept a constant distance to the upper surface of the shield by contacting with the cushion(s).