Die Bonder Collet Replacement Mechanism
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Solution Overview
Problem
Conventional die bonding techniques face challenges with complex mechanisms, wide replacement areas, and height variations of collets, leading to reduced operation efficiency and difficulty in promptly confirming collet attachment during replacement.
Innovation Solution
A die bonder with a collet replacing unit that includes a discarding unit, a supplying unit, and a control device to manage collet engagement and attachment, along with a collet descent distance correcting unit using differential pressure and height measurement to ensure precise collet positioning and attachment confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional collet replacement mechanisms are used, then collet replacement can be performed, but the mechanism at the tip end becomes complicated
Solution Approach 1:
The patent extracts the collet replacement function from the complex mechanical mechanism by introducing a separate collet holder that can be independently inserted and removed. The collet holder is held by a holding unit with engagement portions that can engage with the collet, allowing the collet to be replaced without manipulating the complex tip end mechanism. This separates the replacement operation from the bonding mechanism complexity.
Solution Approach 2:
The collet holder serves as an intermediary component between the bonding head and the collet. Instead of directly manipulating the collet through the complex tip end mechanism, the collet holder is inserted to hold the collet via engagement portions. This intermediary simplifies the replacement process by providing a direct interface for collet attachment and detachment.
2Ease of operation
If conventional collet insertion methods are used, then collet replacement can be performed, but the inserting space and replacement area become wide
Solution Approach 1:
The collet holder is designed to be nested within the bonding head structure, with the holding unit positioned inside the bonder. The engagement portions are arranged to engage the collet in a compact configuration. When the collet holder is inserted, it nests the collet within the bonding head's internal space, minimizing the external footprint and replacement area required for the operation.
Solution Approach 2:
The patent transitions from a lateral insertion method to a vertical insertion method. The collet holder is inserted from the upper side in the vertical direction, utilizing the vertical space within the bonder. This dimensional change allows the replacement operation to occur within a smaller horizontal footprint, reducing the overall replacement area while maintaining ease of operation.
3Measurement precision
If optical means are used to confirm collet attachment, then attachment confirmation is possible, but additional optical means need to be provided or movement to another area is required
Solution Approach 1:
The holding unit with engagement portions serves multiple functions: it mechanically holds the collet, enables replacement operation, and provides attachment confirmation. The engagement portions are designed to engage with specific features of the collet, and the state of engagement itself serves as the confirmation mechanism. This eliminates the need for separate optical confirmation systems by making the mechanical engagement structure multi-functional.
Solution Approach 2:
The collet holder and engagement portions are designed to self-confirm attachment through their mechanical interaction. When the engagement portions successfully engage with the collet, the mechanical state itself indicates proper attachment. The system uses its own structural features for confirmation rather than requiring external optical measurement devices, making the attachment confirmation inherent to the replacement mechanism.
4Manufacturing precision
If collet height variations are not addressed, then manufacturing variations in nm units affect the descent distance, but addressing this requires additional measurement and correction mechanisms
Solution Approach 1:
The engagement portions are designed in advance to accommodate the expected range of collet height variations. The holding unit is positioned and dimensioned to provide proper engagement regardless of minor height differences in the collet. This preliminary design consideration built into the engagement structure eliminates the need for real-time measurement and correction mechanisms, as the system is pre-configured to handle manufacturing variations within the specified tolerance range.
Data Source
AI summary
The present invention provides a bonding device and a bonding method with a high operation ratio by solving the problems of conventional techniques.In the present invention, a collet holder grasping a used collet is inserted from a first opening portion with the upper face open; the used collet is engaged with first engagement portions provided at the first opening portion of a discarding unit; the used collet is removed from the collet holder to be discarded by lifting the collet holder; the collet holder is inserted from a second opening portion with the upper face open of a supplying unit; the uppermost unused collet among plural stacked unused collets is grasped; and the uppermost unused collet ejected from the first opening portion is attached to the collet holder.