Vehicular Lamp Light Guide Positioning and Leakage Prevention
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Solution Overview
Problem
In lamps with semiconductor light-emitting elements, the relative positions of the light source socket and the light guide are difficult to maintain constantly due to vibrations, leading to light leakage from the light-incident portion to unexpected regions.
Innovation Solution
A lamp design that includes a holding member with a positioning portion to securely position the light guide's light-incident portion with respect to the semiconductor light-emitting element, using a light-shielding wall with a reflective film to ensure consistent light incidence and prevent leakage, and a holding member that sandwiches the light-incident portion between two components to maintain its position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light guide is assembled to the lamp housing using a separate assembly member from the light source socket, then the assembly process is simplified and the light guide can be independently positioned, but the relative positions of the light source socket and the light guide cannot be maintained constantly due to vibration
Solution Approach 1:
The holding member is integrated with the light source socket assembly, combining the functions of securing the light guide and maintaining relative position stability. The holding member includes a positioning portion that engages with the light guide and a fixing portion that attaches to the light source socket, ensuring the light guide maintains its correct position relative to the semiconductor light-emitting element even during vehicle vibration.
2Device complexity
If no positioning mechanism is used for the light guide, then the device complexity is reduced, but light leakage occurs from the periphery of the light-incident portion to unexpected regions
Solution Approach 1:
The positioning portion of the holding member acts as an intermediary element between the light guide and the light source socket. It provides precise mechanical engagement that eliminates light leakage by ensuring the light-incident portion is accurately positioned, while adding minimal complexity to the overall device structure.
3Ease of manufacture
If the light-incident portion is not held at a fixed position, then the assembly process is simpler, but the light emission uniformity and reliability are compromised
Solution Approach 1:
The positioning portion is designed in advance to engage with the light guide during assembly, preliminarily establishing the correct position of the light-incident portion relative to the semiconductor light-emitting element. This preliminary positioning action ensures high precision light incidence while maintaining a simple assembly process.
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 solution ensures that the light-incident portion is always held at a constant position relative to the semiconductor light-emitting element, enhancing the reliability of the lamp by preventing light leakage and ensuring efficient light distribution.
Implementation Method 1
A reflective film is provided on the inner surface of the light-shielding wall so as to return the light emitted from the semiconductor light-emitting element to the periphery of the light-incident portion to the light-incident portion
Data Source
AI summary
A light source socket is detachably attached to a housing of a vehicular lamp, and the light emitted by an LED on the light source socket is incident on a light-incident portion of a light guide to be guided to a light-emitting portion. The light guide is held by a pair of holding members at a predetermined position of a lamp housing via a reflector. Positioning portions configured to sandwich the light-emitting portion therebetween are formed on the holding members, respectively, and the light-incident portion is held at a fixed position with respect to the LED. The LED is surrounded by light-shielding walls of the holding members, and the light emitted to the periphery of the light-incident portion is returned to the light-incident portion by reflective films of the light-shielding walls.