Optical Element Light-Absorbing Structure for Thermal Stability
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Solution Overview
Problem
Current optical systems face issues with optical elements breaking due to temperature differences, leading to instability and poor optical quality, as glass components experience uneven heating when irradiated by light beams.
Innovation Solution
Incorporating a light-absorbing structure on the edges of optical elements, such as light-splitting elements and lenses, to absorb stray light and balance temperature distribution, preventing cracking and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If glass is used as the main material for optical elements to ensure good optical performance, then the optical quality is improved, but the glass is prone to breaking due to temperature difference and uneven heating
Solution Approach 1:
The patent applies local quality by introducing a light-absorbing structure specifically at the edge region of the optical element body, where heat accumulation occurs. This localized modification absorbs stray light and balances temperature distribution without affecting the overall optical performance of the glass material.
Solution Approach 2:
The patent converts the harmful effect of stray light into a beneficial one by using the light-absorbing structure to absorb this stray light. The absorbed light energy is converted to heat, which then balances the temperature difference between the center and edge of the optical element, preventing thermal stress and cracking.
2Power
If the light beam is focused on the wavelength conversion color wheel through various optical elements, then the optical performance is improved, but the center temperature of the glass increases while the edge temperature remains low, leading to imbalanced tensile stress
Solution Approach 1:
The patent converts the harmful temperature gradient into a beneficial balanced temperature distribution. The light-absorbing structure at the edge absorbs stray light and generates heat locally, which compensates for the heat loss at the edges and creates a more uniform temperature distribution throughout the optical element.
Solution Approach 2:
The patent changes the thermal parameters of the optical element by introducing a light-absorbing structure that modifies the heat absorption and distribution characteristics. This structural modification alters the temperature field distribution, transforming the harmful thermal stress condition into a balanced thermal state.
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 effectively prevents optical element cracking by balancing temperature differences, thereby improving the stability and optical quality of the illumination system and projection devices.
Implementation Method 1
the light-absorbing structure is distributed on at least a part of an edge of the body, and the at least a part is adjacent to the second region
Implementation Method 2
the wavelength conversion element is disposed on the transmission path of the laser beam from the at least one lens, and is configured to reflect the laser beam back to the light-splitting element and convert the laser beam into an excited beam
Data Source
AI summary
An illumination system including a light source module, a plurality of optical elements and a wavelength conversion element is provided. The optical elements include a light-splitting element and at least one lens, which is located between the light-splitting element and the wavelength conversion element. At least one of the optical elements includes a body and a light-absorbing structure. When the laser beam is incident to the body, a light spot is formed on the body, and a region where the light spot is located is defined as a first region. The first region is located at one side of a central axis of the body. Another side of the central axis of the body has a second region, wherein the light-absorbing structure is distributed on at least a part of an edge of the body, and the at least a part is adjacent to the second region.