Motion-Detecting Module Light-Sensing Die Protection
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Solution Overview
Problem
The existing motion-detecting modules in optical mouse technology require costly packaging processes to protect light-sensing dies during transport, increasing material and process costs without providing necessary protection against external forces and stray light.
Innovation Solution
A motion-detecting module design where the light-sensing die is directly and electrically disposed on a PCB without packaging, using a package cover with a transparent area to shield the die from damage and stray light, eliminating the need for extra protective packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a package protection body is used to protect the light-sensing die during transport, then the light-sensing die is protected from damage, but extra cost (package material and device) and process (package process) are increased
Solution Approach 1:
The patent merges the protection function into the existing package cover by adding a transparent element, eliminating the need for a separate package protection body. The package cover simultaneously serves as both the protective element and the structural component, reducing device complexity while maintaining protection reliability.
Solution Approach 2:
The transparent element in the package cover serves multiple functions: it protects the light-sensing die from external forces during transport, shelters the die from stray light, and maintains optical transparency for normal operation. This multi-functionality eliminates the need for dedicated protection structures.
2Reliability
If a package protection body is used to protect the light-sensing die during transport, then the light-sensing die is protected from damage, but extra packaging materials and processes are required
Solution Approach 1:
The protection function is merged into the existing package cover assembly process. The transparent element is integrated into the package cover during normal manufacturing, eliminating the need for separate packaging processes and reducing manufacturing complexity.
Solution Approach 2:
The package cover with transparent element serves its own protection function without requiring additional external protection structures. The design is self-sufficient, using the existing package cover infrastructure to provide protection during transport and operation.
3Device complexity
If the light-sensing die is directly disposed on PCB without packaging, then cost is reduced, but the light-sensing die may be damaged by external force
Solution Approach 1:
The package cover with transparent element provides multiple functions simultaneously: it protects the light-sensing die from external forces during transport, shelters the die from stray light during operation, and maintains optical transparency. This eliminates the need for additional protection structures while reducing device complexity.
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 reduces costs by eliminating unnecessary packaging materials and processes while effectively protecting the light-sensing die from external forces and stray light, ensuring reliable operation.
Implementation Method 1
the package cover has a through hole corresponding to the light-sensing die and a transparent element disposed in the through hole
Data Source
AI summary
A motion-detecting module includes a PCB, a light-emitting unit, and a light-sensing unit. The light-emitting unit is electrically disposed over the PCB. The light-sensing unit has a light-sensing die electrically disposed on the PCB and a package cover covered on the light-sensing die, and the package cover has a through hole corresponding to the light-sensing die and a transparent element disposed in the through hole. The present invention does not need extra package protection body of the prior art for protecting the light-sensing die during the transport of the light-sensing module. The present invention use original package cover to prevent the light-sensing die from being damaged by external force, and the original package cover shelters the light-sensing die from extra stray light.