Wire Bonding Trajectory Control via Dynamic Pivot Point
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Solution Overview
Problem
Conventional wire bonding methods lack precise control over arc motions, leading to issues such as wire leaning, buckling, and uncontrollable bends due to the use of predefined look-up tables that may not accurately represent the desired trajectory.
Innovation Solution
A method is introduced to determine the trajectory of arc motions by defining a pivot point and calculating a plurality of data points with radius and angle values as functions of time, allowing for real-time generation of trajectory data usable by wire bonding machines, thereby providing improved control over wire loop formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If predefined look-up tables are used for arc motions, then the wire bonding process is simplified and easier to operate, but the trajectory control precision deteriorates leading to wire leaning, buckling, and uncontrollable bends
Solution Approach 1:
The patent changes the parameter representation from discrete look-up table values to continuous mathematical functions (polynomials, trigonometric functions, or spline curves) that define the arc trajectory. This allows precise control of trajectory parameters such as radius, center position, and timing, eliminating the precision loss inherent in discrete table-based approaches while maintaining operational simplicity through automated calculation.
2Device complexity
If predefined fixed time based position functions are used, then the device complexity is reduced, but the adaptability to different arc motions deteriorates
Solution Approach 1:
The patent implements dynamic trajectory generation where the arc parameters (radius, center coordinates, timing functions) can be adjusted based on specific bonding requirements. The system dynamically selects and configures mathematical functions to match different arc motion needs, providing versatility without requiring multiple fixed function sets or complex hardware configurations.
Solution Approach 2:
The patent enables flexible adaptation to different arc motions by allowing changes in trajectory parameters such as polynomial degree, function type (trigonometric, spline), and timing characteristics. These parameter adjustments provide diverse arc motion capabilities using a unified mathematical framework, maintaining low device complexity while achieving high adaptability.
3Ease of operation
If closest approximation from predefined look-up tables is selected, then the ease of operation is maintained, but the manufacturing precision of the wire loop formation deteriorates
Solution Approach 1:
The patent transitions from selecting approximate discrete values from look-up tables to precisely defining continuous mathematical functions with adjustable parameters. Users can specify exact radius, center position, and timing characteristics, ensuring the wire loop formation matches design requirements precisely while maintaining operational simplicity through automated parameter calculation and trajectory generation.
Data Source
AI summary
A method of determining a trajectory of an arc motion of a wire used in the formation of a wire loop is provided. The arc motion is between a first point and a second point of the trajectory. The method includes: (1) defining a pivot point with respect to the first point and the second point; (2) determining a plurality of data points for generating the trajectory, each of the data points including a radius value and an angle value as a function of time, each of the angle values being between (a) a first angle defined by the pivot point and the first point, and (b) a second angle defined by the pivot point and the second point; and (3) converting the plurality of data points into trajectory data that may be used by a wire bonding machine.