Vehicle Outer Lens Parting Structure to Prevent Resin Mixing
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Solution Overview
Problem
The integration of resin-material outer lenses with different light transmitting properties in vehicle light-emitting components often results in visible mixing at the radial parting portion, affecting design and functionality due to heat transfer during molding.
Innovation Solution
The outer lens is designed with a second molded part having a radial parting portion that gradually reduces in thickness towards the first molded part, limiting heat transfer and preventing mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-color molding or insert molding method is used to produce outer lens with different light transmitting parts, then light shielding part and light transmitting part are firmly integrated, but heat transfer during molding causes resin mixing at radial parting portion
Solution Approach 1:
The patent applies local quality by making the thickness of the light shielding part non-uniform, specifically reducing thickness at the radial parting portion. This localized thickness variation prevents resin mixing at the critical parting area while maintaining adequate thickness elsewhere for structural integrity and light shielding function.
Solution Approach 2:
The patent changes the thickness parameter of the light shielding part at the radial parting portion. By reducing the thickness to 1mm or less at this specific location, the heat transfer from the light transmitting part is minimized, preventing resin mixing while maintaining overall component functionality.
2Adaptability or versatility
If radial parting portion is designed for functionality, then parting portion is disposed in radial direction, but resin mixing occurs more easily and is visually recognized
Solution Approach 1:
The patent maintains the radial parting portion configuration for design flexibility but applies local quality control by reducing thickness specifically at the parting portion. This allows the radial design to be preserved while preventing visible mixing defects at the critical interface area.
Solution Approach 2:
The patent utilizes the fluidity and viscosity characteristics of molten resin during the molding process. By controlling the thickness at the radial parting portion, the resin flow and heat transfer are managed to prevent mixing, leveraging the hydraulic-like behavior of the molten material.
3Manufacturing precision
If thickness of second molded part is reduced at radial parting portion, then heat transfer is limited and mixing is prevented, but structural strength may be reduced
Solution Approach 1:
The patent applies local quality by reducing thickness only at the radial parting portion where heat transfer causes mixing, while maintaining adequate thickness in other areas for structural strength. This localized approach prevents mixing defects without compromising overall component strength.
Solution Approach 2:
The patent compensates for reduced thickness at the parting portion by utilizing the third dimension (depth/length in radial direction). The light shielding part extends sufficiently in the radial direction, providing structural integrity even with reduced thickness at the critical parting interface.
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
This design effectively suppresses molding failures at the radial parting portion, maintaining the integrity and appearance of the lens by reducing visible mixing and preserving light transmitting properties.
Implementation Method 1
the material of the second molded part, which has been heated and fluidized, comes into contact with the first molded part formed in advance, whereby the first molded part is heated
Data Source
AI summary
An outer lens 3 of a vehicle light-emitting component 1 includes a first molded part 31, and a second molded part 42 that has a light transmitting property different from a light transmitting property of the first molded part 31 and that is formed integrally with the first molded part 31. The second molded part 42 includes a second radial parting portion 45 adjacent to the first molded part 31 in a radial direction. The outer lens 3 satisfies the following element (1) or (2): (1) the second molded part 42 in the second radial parting portion 45 having a thickness that is gradually reduced in the radial direction toward the first molded part 31; (2) the second molded part 42 in the second radial parting portion 45 having a thickness not greater than 0.8 mm at a radial end portion facing the first molded part 31.