Projection Optics Enclosure Heat Dissipation Design

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Solution Overview

Problem

In projection apparatuses using reflective optical elements, excessive light entry leads to heating issues, causing deformation of the optical system enclosure and affecting optical performance, particularly at high illumination intensities.

Innovation Solution

A projection apparatus design featuring a projection optics enclosure with a first opening section to expose the reflective optical element, allowing heat dissipation and using an integral or separate holder with a heat sink to dissipate heat directly to the environment, while maintaining a sealed state with seal members to prevent dust entry.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a reflective optical element is used in the projection optical system to handle large amounts of light, then the light deflection and image projection capability is improved, but the reflective optical element and projection optics enclosure are heated causing deformation and affecting optical performance

Engineering Contradiction:
Improveimage projection capabilityVSAvoidtemperature of reflective optical element
Core Design Contradiction:
ProductivityVSTemperature

Solution Approach 1:

The patent extracts the harmful heat from the projection optics enclosure by providing a dedicated heat dissipation path. The reflective optical element is configured to allow heat to escape through a specific direction (rearward or laterally) separate from the optical path, thereby removing the thermal burden that causes deformation while preserving the light deflection function.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces an intermediary heat dissipation structure (such as a heat sink or heat dissipation plate) between the reflective optical element and the enclosing environment. This intermediary component facilitates thermal energy transfer from the heated optical element to the surrounding air or heat sink, preventing direct heat accumulation that would cause deformation.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the projection optics enclosure is sealed to protect internal components, then dust protection is improved, but heat dissipation from the reflective optical element is hindered

Engineering Contradiction:
Improvedust protectionVSAvoidheat dissipation capability
Core Design Contradiction:
Object-affected harmful factorsVSTemperature

Solution Approach 1:

The patent segments the enclosure structure by providing a dedicated heat dissipation opening or pathway that is spatially separated from the sealed optical chambers. This allows the enclosure to maintain its protective sealing for dust while creating a specific channel for thermal energy to escape, effectively dividing the enclosure into protected and heat-dissipating zones.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by creating a specific region (heat dissipation opening or pathway) with different properties than the rest of the sealed enclosure. While the majority of the enclosure remains sealed for dust protection, the localized heat dissipation region allows thermal energy to escape, providing both functions simultaneously through differentiated local characteristics.

Inventive Principle:
Principle #3Local quality

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 effectively suppresses heat-induced deformation, maintains optical performance, and prevents misalignment, ensuring efficient cooling and dust protection even at high illumination levels.

Implementation Method 1

a reflective optical element that forms the projection optical system, deflects back the image light

Methodology Applied
Scientific EffectReflection: Reflection

Implementation Method 2

an integral or separate holder with a heat sink to dissipate heat directly to the environment

Methodology Applied
Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 3

allowing heat dissipation and using an integral or separate holder with a heat sink to dissipate heat directly to the environment

Methodology Applied
Scientific EffectConvection: Convection

Data Source

PatentUS11846868B2Projection apparatus with heat dissipation
Publication Date: 2023.12.19 SEIKO EPSON CORP
  • US11846868B2 patent drawing
  • US11846868B2 patent drawing
  • US11846868B2 patent drawing

AI summary

A projection apparatus (projector) includes a light source apparatus, an image generation unit that generates image light from the light from the light source apparatus, a projection optical system that projects the image light, a reflective optical element (reflection mirror) that forms the projection optical system, deflects back the image light, and causes the deflected image light to exit, a projection optics enclosure that accommodates the projection optical system, and a first opening section formed in the projection optics enclosure so as to open in the position of the reflective optical element (reflection mirror).