Movable Light Source for Rod-Like Illumination Guide
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Solution Overview
Problem
Existing illumination devices with rod-like light guides experience fluctuations in light distribution due to changes in the distance between the light source and the light guide, primarily caused by temperature changes, leading to inconsistent light emission.
Innovation Solution
A movable light source connected to a flexible wiring system that adjusts relative to a circuit board, allowing the light source to move in conjunction with the light guide's elongation or contraction, thereby maintaining a consistent distance and reducing fluctuations in light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a rod-like light guide is used to guide light from a point source, then linear irradiation is achieved, but fluctuation in distance between the light source and light guide causes inconsistent light distribution
Solution Approach 1:
The light source is made movable relative to the circuit board, allowing it to dynamically adjust its position in response to thermal expansion or contraction of the light guide. This dynamic adjustment mechanism maintains a stable distance between the light source and light guide, ensuring consistent light distribution despite temperature changes.
Solution Approach 2:
The system changes the physical state or position of the light source based on temperature-induced dimensional changes in the light guide. By detecting and responding to these parameter changes, the system compensates for distance variations and maintains stable illumination.
2Temperature
If the light guide elongates or contracts due to temperature change, then the distance between light source and light guide changes, but this causes fluctuation in light distribution
Solution Approach 1:
The movable light source configuration creates a feedback mechanism where the light source position automatically adjusts in response to light guide dimensional changes. This passive feedback system compensates for temperature-induced expansion or contraction, maintaining stable light distribution without requiring active control.
3Device complexity
If the light source is fixed to the circuit board, then electrical connection is simple, but the light source cannot adjust to light guide dimensional changes
Solution Approach 1:
A flexible wiring board is used to connect the light source to the circuit board. This flexible connection allows the light source to move relative to the circuit board while maintaining electrical connectivity, thus accommodating light guide dimensional changes without compromising wiring simplicity.
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 configuration ensures stable and consistent light distribution across the light guide, minimizing fluctuations in light intensity and improving the overall performance of the illumination device.
Implementation Method 1
a rod-like light guide that is configured to guide light from the light source
Implementation Method 2
a flexible wiring configured to supply electricity from the circuit board to the light source
Data Source
AI summary
There is provided with an illumination device. The illumination device has a circuit board; a light source movable relative to the circuit board; a rod-like light guide that is configured to guide light from the light source and that is elongated in a longitudinal direction; and a flexible wiring configured to supply electricity from the circuit board to the light source. The light source is capable of moving in the longitudinal direction to reduce fluctuation in distance between the light source and a light receiving surface of the light guide when an end portion of the light guide in the longitudinal direction moves in the longitudinal direction.