Multi-layer Thermal Insulation for Optical System Stability
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Solution Overview
Problem
The optical system in wire bonding apparatuses experiences thermal instability due to heat from the heater block, leading to inaccurate determination of the die position during wire bonding, especially when fine wires and bond pitches are involved.
Innovation Solution
A multi-layer thermal insulation system is implemented, comprising a cover layer, a dynamic air layer, and a static air layer, which reduces heat transfer from the heater block to the optical system, maintaining thermal stability by isolating and dissipating heat through moving air and additional insulating layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the optical system is positioned over the heating zone during wire bonding, then wire bonding can be performed, but the optical system is exposed to heat from the heater block causing thermal expansion and inaccurate wire bonding
Solution Approach 1:
A multi-layer thermal insulation system is introduced as an intermediary between the heater block and the optical system. This insulation system includes multiple layers of insulating material that block heat transfer while allowing the optical system to remain positioned over the heating zone during wire bonding operations.
Solution Approach 2:
The thermal insulation system is designed to automatically maintain the optical system's temperature stability without requiring active cooling or heating mechanisms. The insulation layers work passively to shield the optical system from heat, allowing it to self-maintain dimensional stability throughout the wire bonding process.
2Stability of the object's composition
If the optical system is moved away from the heating zone to avoid heat exposure, then thermal stability is improved, but the ability to perform wire bonding is compromised
Solution Approach 1:
The thermal insulation system acts as a mediator that enables the optical system to remain in the optimal position for wire bonding while protecting it from heat exposure. The insulation layers create a thermal barrier that allows close proximity to the heating zone without compromising thermal stability.
3Temperature
If thermal insulation layers are added between the heater block and optical system, then heat transfer is reduced, but device complexity increases
Solution Approach 1:
The thermal insulation system is divided into multiple discrete layers, each serving a specific thermal insulation function. This segmentation allows for modular design and assembly, making the complex insulation requirement manageable through systematic layering of insulating materials with different thermal properties.
Solution Approach 2:
The thermal insulation system employs composite construction with multiple layers of different insulating materials. Each layer may have different thermal conductivity, thickness, and material composition to optimize heat blocking while managing the overall structural complexity through standardized composite insulation design.
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
The multi-layer thermal insulation system ensures minimal thermal expansion and contraction of the optical system, maintaining a consistent light path and achieving accurate wire bonding by maintaining thermal stability, thereby improving the accuracy of ball placement on bonding pads.
Implementation Method 1
at least one layer of moving air injected into the layer
Implementation Method 2
multiple insulation layers located between the component and a heat source
Data Source
AI summary
A thermal insulation system is provided for a component of a bonding system, such as an optical system. The thermal insulation system comprises multiple insulation layers located between the component and a heat source. The multiple insulation layers comprise at least one layer of moving air injected into the layer and a cover layer enclosing the layer of moving air. The multiple insulation layers may further comprise a layer of static air.