Molding Die Structure for Lens Eccentricity Control
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Solution Overview
Problem
Existing molding die structures face challenges in achieving high eccentricity accuracy for lenses, particularly in small lenses used in digital cameras, endoscopes, and mobile phones, due to axial displacement issues between optical surfaces during the injection molding process.
Innovation Solution
A molding die structure comprising a fixed die and a movable die with coaxially formed sleeves and accommodating portions that allow for precise alignment and transfer of optical functional surfaces, utilizing first and second transfer portions to maintain contact and release the molded article while minimizing axial displacement, thereby improving eccentricity accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If molding dies are press-fitted into hole portions formed by combining two dies in advance, then axial displacement of molding dies is improved and eccentricity accuracy is improved, but the structure complexity increases due to pre-combined dies and accommodating portions
Solution Approach 1:
The invention divides the molding system into separate components: a fixed die and a movable die that are not permanently combined. The molding dies are held by accommodating portions during molding but can be independently positioned. This segmentation allows precise control of axial displacement while maintaining structural flexibility, resolving the contradiction between precision and complexity.
Solution Approach 2:
The invention introduces accommodating portions as intermediary structures that temporarily hold the molding dies in precise positions during the molding process. These accommodating portions act as mediators between the fixed and movable dies, ensuring accurate alignment without requiring permanent combination of the dies, thus reducing overall structure complexity while maintaining high precision.
2Manufacturing precision
If ball retainers are provided between molding die and die to reduce clearance and improve axial displacement, then eccentricity accuracy is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts and eliminates the ball retainer component from the molding system. Instead of using ball retainers to reduce clearance, the design relies on the inherent fit between the molding dies and accommodating portions, along with precise machining of the fixed and movable dies. This removal of the ball retainer simplifies the structure while maintaining axial displacement control.
3Ease of operation
If sliding clearances are used in traditional molding dies, then ease of operation is improved, but axial displacement increases and manufacturing precision deteriorates
Solution Approach 1:
The invention changes the clearance parameter from sliding clearance to a controlled fit between molding dies and accommodating portions. By precisely controlling the dimensional parameters of the accommodating portions and molding dies, the system achieves minimal axial displacement without requiring sliding clearances, thus maintaining both precision and operational ease through parameter optimization.
Data Source
AI summary
Fixed side molding dies are removed from fixed side molding dies insertion hole portions in accordance with the disconnection in the connection/disconnection while maintaining a contact state that a second transfer portion is in contact with a portion other than a fixed side optical functional surface of each molded article at the time of mold opening of a fixed die and a movable die. Thereby a first transfer portion is released from the fixed side optical functional surface.