Light Pipe Optical Film Thermal Stability
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Solution Overview
Problem
Illuminating devices using light pipes often experience non-uniform brightness due to varying illuminance levels along the longitudinal direction, primarily caused by heat-induced deformation of the optical film's prism patterns, which affects total reflection efficiency.
Innovation Solution
The optical film is formed with a material having a glass transition temperature (Tg) ranging from 110° C. to 180° C., ensuring thermal stability and preventing deformation from heat generated by the light source, while the light pipe includes a base pipe with a hollow conduit and prism patterns for efficient light transmission and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an optical film is used in a light pipe, then light transmission efficiency is improved, but the optical film deforms due to heat from the light source, causing non-uniform brightness
Solution Approach 1:
The patent changes the material parameter of the optical film by selecting a material with a glass transition temperature of 110°C to 180°C. This parameter change ensures the film maintains its shape stability under the heat conditions generated by the light source, preventing deformation and maintaining uniform brightness while preserving light transmission efficiency.
2Stability of the object's composition
If the glass transition temperature of the optical film is increased to prevent deformation, then thermal stability is improved, but the film may become more difficult to process or manufacture
Solution Approach 1:
The patent optimizes the glass transition temperature parameter to a specific range (110°C to 180°C) that balances thermal stability with manufacturability. This parameter selection ensures the film is stable under operating heat conditions while remaining processable during manufacturing, resolving the contradiction between thermal stability and ease of manufacture.
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 solution maintains the efficiency of the light pipe by preventing thermal deformation of the optical film, ensuring consistent light distribution and uniform brightness across the illuminating device, even at high temperatures.
Implementation Method 1
an optical film (322) including a plurality of prism patterns, wherein the optical film (322) is formed of a material having a glass transition temperature of 110° C. to 180° C.
Implementation Method 2
Light pipes may also be referred to as light conduits, light guides or light tubes, and have been used to effectively distribute light across a wide area for various purposes such as for illumination.
Data Source
AI summary
A light pipe and an illuminating device having the light pipe may be provided. The light pipe may include an optical film having a glass transition temperature of approximately 110° C. to approximately 180° C.