Stage Lighting Fixture Heat-Shield Filter Overheating

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Solution Overview

Problem

Stage lighting fixtures experience frequent overheating of discharge lamps, leading to impaired reliability and user discomfort due to the heating caused by visible and invisible hot light reflected by dichroic filters.

Innovation Solution

A stage lighting fixture with a heat-shield assembly that filters out invisible and visible hot light using a heat-shield filter with specific transmittance properties, preventing overheating and protecting the light source while maintaining the quality of the light beam.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If dichroic filters are used to selectively intercept and colour the light beam, then the light quality and colour selection are improved, but the light source overheats due to reflected hot light

Engineering Contradiction:

Improvelight qualityVSAvoidlight source temperature

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

A heat-shield filter is introduced as an intermediary element between the light source and the dichroic filters. This heat-shield filter selectively absorbs invisible hot light (infrared radiation) while allowing visible light to pass through, thereby protecting the light source from overheating without compromising the colour quality provided by the dichroic filters.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The harmful invisible hot light component is extracted and removed from the light beam before it reaches the light source. The heat-shield filter isolates and absorbs the infrared radiation, separating it from the useful visible light that contributes to illumination and colour rendering.

Inventive Principle:

Principle #2Taking out (Extraction)

2Illumination intensity

If dichroic filters reflect hot light to maintain colour quality, then the colour rendering is improved, but the light source reliability deteriorates due to overheating

Engineering Contradiction:

Improvecolour renderingVSAvoidlight source reliability

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The heat-shield filter serves as a protective intermediary that absorbs the harmful reflected hot light from the dichroic filters before it reaches the light source. This maintains the colour rendering function of the dichroic filters while protecting the light source reliability by preventing thermal damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The heat-shield filter converts the harmful reflected hot light into a beneficial effect by absorbing the infrared radiation and preventing it from reaching the light source. The harmful thermal energy is transformed into heat within the heat-shield filter itself, protecting the overall system reliability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Power

If the light source is allowed to operate at high power, then the illumination output is improved, but the working life is reduced due to frequent overheating

Engineering Contradiction:

Improveillumination outputVSAvoidworking life

Core Design Contradiction:

PowerVSDuration of action of stationary object

Solution Approach 1:

The heat-shield filter acts as a protective intermediary that enables the light source to operate at high power levels by absorbing the reflected hot light from the dichroic filters. This prevents thermal accumulation that would otherwise limit the operating duration and working life of the light source.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The heat-shield filter performs preliminary action by absorbing the harmful hot light before it can accumulate and overheat the light source. This preventive measure allows the light source to maintain high power output for extended periods without thermal damage, thereby extending its working life.

Inventive Principle:

Principle #10Preliminary action

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 heat-shield assembly effectively reduces overheating of the light source, enhancing its reliability and extending its working life without affecting the light quality or useful light projection.

Implementation Method 1

a first heat-shield filter 21 with a first transmittance of less than 10% for invisible hot light

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

a first heat-shield filter 21 with a first transmittance of more than 80% for visible light

Methodology Applied

Scientific EffectOptical transmission:

Implementation Method 3

at least one dichroic filter for selectively intercepting and colouring the light beam

Methodology Applied

Scientific EffectDichroic filtering: Dichroic Filter

Data Source

PatentUS8820973B2Stage lighting fixture

Publication Date: 2014.09.02 CLAY PAKY SPA

AI summary

A stage lighting fixture having :a light source for emitting a light beam along an optical axis;a reflector coupled to the light source;at least one dichroic filter for selectively intercepting the light beam; andat least one heat-shield assembly located between the light source and the dichroic filter, and having a heat-shield filter, in turn having a first portion with first beam filtering properties, and a second portion with second beam filtering properties.