Laser Soldering Conical Lens Double Beam Heating
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Solution Overview
Problem
Conventional laser soldering technologies face inefficiencies and part burning issues when soldering annular and bar-shaped terminals, as ring-shaped laser beams fail to adequately heat both components, leading to prolonged soldering times and reduced work efficiency.
Innovation Solution
A laser soldering apparatus using a conical lens to convert a circular laser beam into a double circular beam with a ring and spot portion, allowing simultaneous heating of annular and bar-shaped terminals without burning, achieved through a simple optical configuration involving a semitransparent mirror and multiple optical lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular laser beam is projected on the to-be-soldered object, then the soldering can be performed in a non-contact manner, but the electronic part may be burnt through the clearance between terminals
Solution Approach 1:
The circular laser beam is segmented into a ring-shaped beam and a spot-shaped beam through the conical lens with central hole. The ring-shaped beam heats the annular terminal while the spot-shaped beam heats the bar-shaped terminal, preventing the burning problem by directing energy precisely to each terminal type.
2Object-affected harmful factors
If a ring shape laser beam is used to heat the annular terminal, then the burning problem is solved, but the bar-shaped terminal at the central portion cannot be heated
Solution Approach 1:
The ring-shaped laser beam is segmented by the conical lens to create two distinct heating zones: a ring-shaped heating zone for the annular terminal and a spot-shaped heating zone at the center for the bar-shaped terminal. This segmentation allows both terminals to be heated simultaneously, maintaining high soldering efficiency while preventing burning.
Solution Approach 2:
Different parts of the laser beam are given different shapes and positions to match different terminal types. The ring-shaped portion of the beam provides heating at the periphery for the annular terminal, while the spot-shaped portion provides concentrated heating at the center for the bar-shaped terminal, optimizing heating quality for each location.
3Object-affected harmful factors
If a ring shape laser beam is used, then the annular terminal can be heated, but the soldering time is increased due to rapid cooling by the low temperature bar-shaped terminal
Solution Approach 1:
The laser beam is segmented into ring-shaped and spot-shaped components that simultaneously heat both the annular terminal and the bar-shaped terminal. This concurrent heating prevents the temperature differential that causes rapid cooling, thereby reducing soldering time while maintaining burning prevention.
Solution Approach 2:
The conical lens with central hole is designed to pre-divide the laser beam into appropriate shapes before it reaches the soldering point. This preliminary beam shaping ensures that both terminals receive appropriate heating from the start, preventing temperature imbalances that would extend soldering time.
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 configuration enables efficient soldering of both terminal types without burning, reducing soldering time and improving work efficiency by ensuring both components are adequately heated, even in complex electronic part configurations.
Implementation Method 1
a conical lens converts the circular laser beam to a double circular beam having a ring portion with a circular ring shape and a spot portion located at a center of the ring portion
Implementation Method 2
the laser beam is projected on a to-be-soldered object such as a printed circuit bard from a soldering head, and a solder is melted with heat of the laser beam
Implementation Method 3
The incident unit and the projecting unit are disposed so that an optical axis can be refracted at an angle of 90 degree by the intermediary of a semitransparent mirror
Data Source
AI summary
Provided is a laser type soldering apparatus which performs soldering by projecting a laser beam on a to-be-soldered object, one of a plurality of optical lenses is a conical lens, wherein an incident surface or a emitting surface of the conical lens is a conical surface, and a central portion of the conical lens has a central hole having a diameter smaller than that of a circular laser beam that is incident to the conical lens, and the conical lens converts the circular laser beam to a double circular beam having a ring portion with a circular ring shape and a spot portion located at a center of the ring portion, so that the double circular beam is projected on the to-be-soldered object.