Beam Detector Mounting via Extended Solder Cream Self-Alignment
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Solution Overview
Problem
Conventional scanning optical devices face challenges in accurately managing the attachment position of the beam detector (BD), leading to increased costs due to the need for a larger light receiving portion, which affects the manufacturing cost and efficiency.
Innovation Solution
A method of reflow mounting electronic components, such as the BD, onto a substrate using solder cream portions applied beyond the copper foil patterns, ensuring precise alignment and reducing the range of variation in attachment positions through self-alignment during the reflow process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the light receiving portion of the BD is made larger to accommodate attachment position variation, then the attachment position tolerance is improved, but the manufacturing cost increases
Solution Approach 1:
The solder cream is applied in advance beyond the copper foil pattern boundaries to create an extended solderable area. This preliminary action ensures that even if the BD attachment position varies, the solder will always reach the copper foil pattern, effectively enlarging the functional light receiving area without physically enlarging the BD component itself.
Solution Approach 2:
The extended solder cream acts as an intermediary element between the BD terminals and the copper foil patterns. By extending the solder cream beyond the copper foil patterns, it creates a buffer zone that accommodates attachment position variations, allowing the BD to be mounted accurately without requiring a larger light receiving portion.
2Reliability
If the light receiving portion is made larger to ensure light reception despite attachment variation, then the reliability of light detection is improved, but the device complexity and cost increase
Solution Approach 1:
The solder cream is preliminarily applied extending beyond the copper foil patterns to ensure that the bonding area is always sufficient regardless of attachment position variations. This preliminary extension of the solder cream creates a reliable connection that ensures light detection functionality without modifying the BD structure.
Solution Approach 2:
The solder cream self-aligns during the reflow mounting process to ensure proper bonding between the BD terminals and the copper foil patterns. The extended solder cream automatically adjusts to accommodate position variations, providing self-service alignment that ensures reliable light detection without adding structural complexity to the BD.
3Productivity
If the attachment position accuracy is improved by reducing variation range, then the light receiving efficiency is improved, but the mounting process complexity increases
Solution Approach 1:
The solder cream is applied in advance with an extended length beyond the copper foil patterns. This preliminary extension creates a larger effective bonding area that maintains high light receiving efficiency even with standard mounting precision, without requiring complex mounting processes or specialized equipment.
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 method enhances the accuracy of the attachment position, reducing the range of variation from ±0.20 mm to ±0.05 mm, thereby decreasing manufacturing costs and improving the efficiency of the scanning optical device.
Implementation Method 1
method of mounting electronic component onto substrate in reflow manner
Implementation Method 2
ensuring precise alignment and reducing the range of variation in attachment positions through self-alignment during the reflow process
Data Source
AI summary
The method of mounting an electronic component onto a substrate by a reflow process, the electronic component having at least one first terminal provided along one side of the electronic component and at least one second terminal provided along another side of the electronic component opposed to the one side, the substrate having a first copper foil pattern to which the at least one first terminal is soldered and a second copper foil pattern to which the at least one second terminal is soldered, the method including applying a first solder cream portion to the first copper foil pattern and applying a second solder cream portion to the second copper foil pattern.