Flexible Connecting Frame for Wire Bonding Actuator Mounting
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Solution Overview
Problem
Existing wire bonding technologies face issues with secure clamping of electrically-driven actuators, leading to weakened vibration amplitude and potential dislodgment, which affects bonding quality, especially for sensitive electronic devices.
Innovation Solution
A wire bonding apparatus with a flexible connecting frame and pivot points adjacent to an elongated slit, allowing rotatable oscillatory motion and secure clamping of electrically-driven actuators, ensuring stable and consistent transverse scrubbing motions at the capillary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If actuators are fixed directly to the transducer, then the transducer can be driven to oscillate, but vertical vibrations are generated that damage the die surface and affect bonding quality
Solution Approach 1:
A flexible connecting frame is introduced as an intermediary component between the actuators and the transducer. This frame allows the actuators to be mounted on one side while transmitting motion to the transducer on the opposite side, thereby eliminating direct vertical coupling and the associated harmful vibrations.
Solution Approach 2:
The flexible connecting frame enables motion transmission in a different dimensional orientation. Instead of direct vertical actuation, the frame converts actuator motion into transverse oscillation of the transducer, changing the direction of force transmission from vertical to lateral.
2Ease of manufacture
If epoxy is used to glue actuators onto the transducer support portion, then assembly is simplified, but the epoxy absorbs the actuator stroke and generates gaps that alter actuator positions and may cause dislodgment
Solution Approach 1:
The flexible connecting frame acts as a thin film structure that provides both mechanical support and motion transmission. Unlike epoxy glue, this flexible film maintains continuous contact with the actuators throughout their stroke, preventing gap formation and position alteration while still allowing for simple assembly.
3Force
If the oscillatory stroke of actuators is magnified by the oscillating mounting structure, then vibration amplitude at the capillary increases, but secure clamping of actuators becomes difficult to maintain
Solution Approach 1:
The flexible connecting frame is designed with dynamic characteristics that allow it to amplify actuator stroke during oscillation while maintaining secure clamping in the static or quasi-static state. The frame's flexibility enables stroke magnification, while its structural design ensures actuators remain firmly positioned during operation.
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 solution provides stable and consistent multi-linear scrubbing motions with variable amplitudes and frequencies, improving bonding quality by securely clamping actuators and reducing vibration interference, thus enhancing the cleaning and adhesion of die pad surfaces.
Implementation Method 1
an elongated slit located in the flexible connecting frame which extends substantially transversely to the actuation direction of the at least one actuator to form at least one pivot point adjacent to an end of the slit about which the flexible connecting frame is rotatable
Implementation Method 2
at least one electrically-driven actuator which is connected to a second side of the flexible connecting frame that is opposite to the first side thereof, the actuator having a longitudinal actuation direction
Implementation Method 3
an ultrasonic transducer including a capillary
Data Source
AI summary
A wire bonding apparatus comprises an ultrasonic transducer including a capillary, a flexible connecting frame having a first side to which the ultrasonic transducer is connected and at least one electrically-driven actuator which is connected to a second side of the flexible connecting frame that is opposite to the first side thereof, the actuator having a longitudinal actuation direction. An elongated slit located in the flexible connecting frame extends substantially transversely to the actuation direction of the at least one actuator to form at least one pivot point adjacent to an end of the slit about which the flexible connecting frame is rotatable when it is driven by the at least one actuator.