Reflecting Plate for Rod-Integrator Lighting Device
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Solution Overview
Problem
In projection display apparatuses, unnecessary light emitted from a light source can cause heating of peripheral members, leading to positional deviations and reduced luminance due to inefficient light shielding and increased temperature, which existing technologies attempt to address but with limitations such as increased complexity and potential heat distortion.
Innovation Solution
A lighting device comprising a light source, a rod-integrator, a light guiding section, and a first reflecting plate positioned close to the rod-integrator's incident face to reflect unnecessary light, thereby reducing heat transfer to peripheral members and maintaining a stable temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a light shielding plate is disposed to cut off unnecessary light, then heating of the rod-integrator holder is reduced, but light having passed through the opening of the light shielding plate still travels to peripheral members including the holder
Solution Approach 1:
A first reflecting plate is introduced as an intermediary element between the light guiding section and the rod-integrator. This reflecting plate reflects unnecessary light away from the rod-integrator holder, preventing direct heating while allowing the light shielding plate to maintain its primary function. The reflecting plate acts as a mediator that redirects light paths without requiring complex shielding structures.
Solution Approach 2:
The light shielding function is segmented into two separate components: a light shielding plate that blocks unnecessary light, and a first reflecting plate that redirects remaining light away from the holder. This segmentation allows each component to perform its specific function more effectively, with the reflecting plate handling light redirection and the shielding plate handling direct blockage, thereby reducing overall complexity.
2Object-affected harmful factors
If the first reflecting plate is disposed closely to the incident face, then unnecessary light is reflected effectively, but the structure requires precise positioning
Solution Approach 1:
The first reflecting plate is merged with the light shielding plate to form an integrated light control assembly. This combination eliminates the need for separate positioning mechanisms and reduces manufacturing complexity. The integrated structure ensures that the reflecting plate maintains its optimal position relative to the incident face without requiring high-precision independent positioning.
Solution Approach 2:
The design allows for adjustment of the distance between the first reflecting plate and the incident face within a specific range (0.1-10mm). This parameter flexibility enables optimization of light reflection effectiveness while accommodating variations in manufacturing tolerances and assembly conditions, thereby reducing the strictness of positioning precision requirements.
3Stability of the object's composition
If high heat-proof adhesives are used to assemble components, then thermal stability is improved, but assembly efficiency and cost are reduced
Solution Approach 1:
The first reflecting plate converts harmful unnecessary light into beneficial reflected light that does not reach the rod-integrator holder. By redirecting light away from the holder, the design reduces heat generation in the assembly, thereby reducing the thermal load on adhesives. This allows the use of lower heat-proof adhesives that are easier to apply and more cost-effective.
Solution Approach 2:
The design changes the thermal environment parameter of the assembly by reducing heat exposure through light reflection. This parameter change in the operating conditions allows the use of adhesives with lower heat resistance specifications, thereby improving assembly efficiency and reducing costs while maintaining sufficient thermal stability.
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 reduces heating of peripheral members, prevents positional deviations, and maintains high luminance by efficiently reflecting unnecessary light, allowing for the use of lower heat-proof adhesives and improved assembly efficiency.
Implementation Method 1
a first reflecting plate... reflects unnecessary light among light emitted from the light guiding section, the unnecessary light not entering the incident light
Implementation Method 2
The reflections from the lateral faces are caused generally by total internal reflection produced due to a difference in refractive indexes between glass and air. During a travel of the incoming light in the rod-integrator, the foregoing mechanism allows the light in the center and the light in the circumference of the beam to mix with each other
Data Source
AI summary
A lighting device includes a light source, a rod-integrator, a light guiding section for guiding light emitted from the light source to an incident face of the rod-integrator and a first reflecting plate. The first reflecting plate has a through-hole and is adjacent to the incident face of the rod-integrator with the rod-integrator being inserted into the through-hole of the first reflecting plate. The first reflecting plate is configured to reflect unnecessary light emitted from the light guiding section, the unnecessary light not entering incident light.