Deep-Access Ribbon Bond Head With External Ribbon Guide
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Solution Overview
Problem
Conventional ribbon bond heads face issues with ribbon damage and wear due to wide slots and insecure clamping, particularly when dealing with wide ribbons, and difficulty in accessing ribbons for deep access bonding.
Innovation Solution
A ribbon bond head assembly featuring a ribbon guide tube that directs the ribbon outside the transducer and a clamping assembly with a stationary body and movable clamp arm, allowing easy access and secure clamping of the ribbon, eliminating the need for a slot through the transducer and preventing ribbon twisting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide slot is used in the transducer to accommodate wide ribbons, then the ribbon can pass through the bond head, but the ribbon is damaged or subject to unnecessary wear
Solution Approach 1:
The patent removes the slot from the transducer entirely and extracts the ribbon guiding function to a separate guide tube positioned at the rear of the bond head. This eliminates the harmful interaction between the ribbon and the transducer slot, preventing ribbon damage while maintaining the ability to accommodate wide ribbons through the guide tube's opening.
Solution Approach 2:
The patent introduces a guide tube as an intermediary component between the ribbon source and the bonding area. This guide tube serves as a mediator that directs the ribbon through its opening to the bonding zone without requiring the ribbon to pass through the transducer, thus protecting the ribbon from damage while enabling wide ribbon accommodation.
2Reliability
If a clamping mechanism with two opposing clamp arms is used to hold the ribbon, then the ribbon can be secured, but the user has difficult access to the ribbon for deep access bonding
Solution Approach 1:
The patent segments the clamping function into two independent components: a stationary clamp arm fixed to the bond head body and a movable clamp arm that can be independently actuated. This segmentation allows the stationary arm to provide stable support while the movable arm provides secure clamping, and crucially, creates open space between the arms for user access to the ribbon during deep access bonding operations.
Solution Approach 2:
The patent implements a dynamic clamping system where one clamp arm is stationary and the other is movable. The movable clamp arm can be dynamically adjusted and actuated to clamp the ribbon only when needed, while remaining open during positioning and bonding operations. This dynamic behavior enables both secure clamping when required and easy access when the clamp is opened, resolving the contradiction between reliability and ease of operation.
3Device complexity
If the clamp arm faces are not as wide as the ribbon, then the clamping mechanism is compact, but the ribbon may not be clamped securely
Solution Approach 1:
The patent designs the movable clamp arm with an open interior portion that can accommodate the ribbon width, while the clamping surfaces (faces) of both clamp arms can be narrower than the full ribbon width. The open interior portion allows the ribbon to be positioned and secured, while the clamping faces provide the necessary contact area for secure clamping. This nested design enables compact dimensions while maintaining adequate clamping security.
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 design enhances ribbon security and accessibility, reducing wear and improving bond quality by allowing for deep access bonding without damaging the ribbon, and simplifies the transducer design to accommodate various ribbon sizes.
Implementation Method 1
Motion of the wire is generated by an ultrasonic transducer excited by an ultrasonic generator to produce high-frequency mechanical vibrations
Implementation Method 2
During this time, the wire portion under the bond tool is deformed, primarily widened, with the actual change in shape depending on the size and the physical properties of the wire, the bond tool geometry, and the process parameter settings
Data Source
AI summary
A ribbon bond head capable of deep access bonding is configured to pass the bonding ribbon outside the transducer, e.g., in front of the transducer, instead of through the transducer. A clamping mechanism includes a stationary flat clamp base and a movable clamp arm with an opening, where the bonding ribbon passes through, not around, the clamp arm. The ribbon is clamped between the movable clamp and the stationary clamp and held securely during looping.