Rotatable Cushioning Pick-and-Place Device for Semiconductor Handling
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Solution Overview
Problem
Existing pick-and-place devices for semiconductors face issues with incomplete cushioning and rotational accuracy due to magnetic suction mechanisms, which are prone to interference and air leaks, leading to potential damage and placement errors.
Innovation Solution
A rotatable cushioning pick-and-place device with a cushioning module using a rotary bearing, driven shaft sleeve, and a cushioning spring to absorb axial impact, combined with a pick-and-place module featuring securely fixed sealing rings to maintain air tightness and precise rotation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If magnetic suction mechanism is used for cushioning and rotation, then the device can provide cushioning effect and rotational drive, but the cushioning effect is incomplete and restoring is often incomplete
Solution Approach 1:
The patent replaces the magnetic suction mechanism with a mechanical cushioning mechanism consisting of a cushioning spring, rotary bearing, and driven shaft sleeve. This mechanical system provides reliable cushioning and restoring forces through elastic deformation of the spring and mechanical coupling, eliminating the incomplete restoring effect of magnetic attraction.
Solution Approach 2:
The cushioning spring is pre-installed between the driven shaft sleeve and the end cover, providing beforehand cushioning capability. The spring is compressed in advance to store elastic potential energy, which is then released to provide restoring force during operation, ensuring complete and reliable restoration.
2Speed
If magnetic suction mechanism is used for rotation, then rotational drive is achieved, but when rotation is affected by foreign objects or external forces, the cooperative linking action between drive shaft and driven shaft may not proceed
Solution Approach 1:
The patent replaces the magnetic field-based rotational drive with a direct mechanical coupling system. The drive shaft is directly connected to the driven shaft through the cushioning mechanism, providing reliable torque transmission that is not susceptible to external magnetic interference or foreign objects affecting magnetic attraction.
3Device complexity
If non-locked sealing member is used, then the device structure is simpler, but once the rotating shaft is axially displaced, the sealing member may be displaced easily so that an air gap is produced, resulting in loss of suction force
Solution Approach 1:
The patent employs a dynamic sealing solution where the sealing member is mounted on the pick-and-place shaft, allowing it to move axially with the shaft while maintaining continuous sealing contact. This dynamic sealing arrangement ensures the sealing member remains effective during axial displacement without requiring complex locking mechanisms.
4Strength
If the pick-and-place device is equipped with cushioning mechanism, then the object to be tested is protected from damage, but the device structure becomes more complex
Solution Approach 1:
The patent merges the cushioning function with the rotational drive function into a single integrated mechanism. The cushioning spring, rotary bearing, and driven shaft sleeve collectively provide both impact cushioning and rotational drive, eliminating the need for separate cushioning and drive mechanisms.
Solution Approach 2:
The driven shaft sleeve serves multiple functions: it transmits rotational motion from the drive shaft, provides axial cushioning through the spring, and maintains sealing contact. This multi-functional design reduces overall device complexity while providing comprehensive protection and control.
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 device effectively cushions impact forces, maintains air tightness during rotation, and ensures precise orientation and placement of fragile semiconductor components, reducing the risk of damage and placement errors.
Implementation Method 1
a cushioning spring arranged between the rotary bearing and the driven shaft sleeve
Implementation Method 2
a suction hole in communication with the second chamber connected to a negative pressure source
Data Source
AI summary
A rotatable cushioning pick-and-place device primarily comprises a motor, a body, a cushioning module and a pick-and-place module. The cushioning module is disposed in a first chamber of the body and comprises a rotary bearing which is connected to a drive shaft of the motor, and coupled to a driven shaft sleeve through a rotary follower. The rotary follower is driven by the rotary bearing to drive the driven shaft sleeve to rotate, thereby allowing the rotary bearing to displace relative to the driven shaft sleeve axially. The cushioning spring is arranged between the rotary bearing and the driven shaft sleeve. A first sealing ring and a second sealing ring of the pick-and-place module are fixed on the body to cooperatively and air-tightly seal the second chamber.