Wearable Light Transmission Window with Solder Blocking
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Solution Overview
Problem
Wearable devices with light transmission window members experience issues such as discomfort due to recess formation, sweat retention, and aesthetic impairment from solder protrusion, which affects light intensity and appearance.
Innovation Solution
A light transmission window member with a metalized film on its side surfaces and a solder blocking portion, featuring a high wettability for solder on one part and low wettability on another, allowing seamless integration with the device housing without protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solder is used to seal the opening to ensure hermeticity, then sealing reliability is improved, but solder protrusion occurs causing aesthetic impairment and discomfort
Solution Approach 1:
The patent applies local quality by creating a solder blocking portion with specific surface properties (different from the surrounding metalized film) at the peripheral portion of the substrate. This localized modification prevents solder from spreading to unwanted areas while maintaining the necessary sealing function, thus solving the contradiction between reliable sealing and preventing solder protrusion.
Solution Approach 2:
The solder blocking portion acts as an intermediary element between the solder and the peripheral portion of the substrate. It controls the solder flow during the sealing process, allowing the solder to adhere to the substrate for hermetic sealing while preventing it from protruding outward, thereby resolving the conflict between sealing reliability and aesthetic quality.
2Reliability
If the substrate is disposed above the device surface to accommodate solder, then sealing is achieved, but a recess is formed causing discomfort and light intensity loss
Solution Approach 1:
The invention applies local quality by modifying only the peripheral portion of the substrate surface to create the solder blocking portion, while the central light transmission area remains unchanged. This localized surface treatment enables the substrate to be disposed flush with the device surface, preventing recess formation while maintaining sealing capability.
Solution Approach 2:
The solder blocking portion is formed in advance on the substrate surface before the sealing process. This preliminary action controls the solder flow path during bonding, ensuring that solder remains confined to the sealing area without protruding or creating recesses, thus achieving both hermeticity and a flush surface.
3Reliability
If metalized film is provided on the substrate for solder bonding, then sealing reliability is improved, but solder spreads to peripheral portions causing protrusion
Solution Approach 1:
The patent applies local quality by creating a solder blocking portion with distinct surface properties at the peripheral portion of the substrate, different from the metalized film in the central area. This localized differentiation allows solder to bond strongly where needed while preventing unwanted spreading at the periphery, resolving the contradiction between bonding strength and solder control.
Solution Approach 2:
The substrate surface is segmented into two functional zones: a metalized film area for solder bonding and a solder blocking portion for preventing solder spread. This segmentation of the surface properties enables the substrate to simultaneously achieve strong solder bonding and prevent solder protrusion.
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
Ensures comfortable wear, maintains light intensity, and enhances aesthetic appeal by preventing recess formation and solder visibility.
Implementation Method 1
a metalized film provided on at least a portion of a side surface of the substrate... having a high wettability for solder on one part and low wettability on another
Data Source
AI summary
Provided is a light transmission window member that, when used in an electronic device, such as a wearable device, can provide an excellent feeling of use and aesthetic quality and can make it less likely that a light intensity loss occurs. A light transmission window member 1 includes: a plate-shaped substrate 2 including a light transmission portion 5; and a metalized film 3 provided on at least a portion of a side surface 2c of the substrate 2, wherein a solder blocking portion 4 is provided on at least a portion of the side surface 2c of the substrate 2.