Slanted Ejector Pin Marks for Resin Scanning Lens Mold Release
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Solution Overview
Problem
Conventional methods for manufacturing scanning lenses made of plastic resin struggle to easily and smoothly remove lenses with slant surfaces from molds due to the inability of traditional ejector pins with flat distal ends to align with slant surfaces.
Innovation Solution
A scanning lens design featuring a lens portion with elongate shape and slant surfaces, along with ejector pins having end faces shaped to match the slanting direction of these surfaces, allowing for the formation of ejector pin marks during removal, facilitating easy and smooth ejection from the mold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional ejector pins with flat distal end faces are used to remove scanning lenses, then the removal process is simple and straightforward, but lenses with slant surfaces cannot be removed easily and smoothly
Solution Approach 1:
The ejector pin is designed with different local geometries: a flat distal end face for general contact and a slanting surface portion that matches the slant surface of the lens. This local adaptation allows the same ejector pin to effectively handle both flat and slanted lens surfaces, resolving the contradiction between simplicity and adaptability.
Solution Approach 2:
Instead of attempting to make the lens surface flat to match the conventional ejector pin, the invention inverts the approach by modifying the ejector pin itself to have a slanting surface portion that matches the lens's slant surface. This reversal of the adaptation direction enables effective ejection of lenses with slant surfaces while maintaining the simplicity of the conventional pin design.
2Force
If ejector pins are positioned to contact slant surfaces, then effective ejection force is applied, but the positioning becomes complex and difficult
Solution Approach 1:
The ejector pin incorporates an asymmetric slanting surface portion that corresponds to the asymmetric slant surface of the lens. This asymmetric design allows the pin to naturally align with and contact the slant surface at the correct position, applying effective ejection force without requiring complex positioning mechanisms or multiple pins.
3Reliability
If multiple ejector pins are used to remove lenses with slant surfaces, then complete contact is achieved, but the manufacturing cost and process complexity increase
Solution Approach 1:
The single ejector pin incorporates a slanting surface portion that provides localized adaptation to the lens's slant surface. This local quality enhancement allows one pin to achieve complete and reliable contact with the slant surface, eliminating the need for multiple pins while maintaining ejection completeness and reliability.
Data Source
AI summary
A scanning lens molded of resin includes: a lens portion having an elongate shape extending in a main scanning direction and having an optical surface; a slant portion having at least one slant surface slanting relative to the main scanning direction; and an ejector pin mark formed on the slant surface when thrusting out the scanning lens by ejector pins. The ejector pin mark is formed along a slanting direction of the slant surface.