Dichroic Filter on Absorbing Substrate for Flashlamp Cooling
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Solution Overview
Problem
Existing light flash treatment devices face inefficiencies due to high energy absorption by filters, leading to excessive heating and reduced power output, especially when light is not incident at normal angles, which can result in inadequate filtering and skin burning.
Innovation Solution
A device comprising a dichroic filter downstream of the flashlamp, followed by an absorbing filter, where the dichroic filter is formed on the absorbing filter via vacuum deposition, allowing efficient cooling and reducing energy dissipation in the absorbing filter, while maintaining effective filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dichroic filter is used to reduce heating, then filter resistance improves, but filtering effectiveness deteriorates when light is not incident at normal angles
Solution Approach 1:
The filtering function is divided into two separate filters: a dichroic filter for reducing heating by reflecting unwanted wavelengths, and an absorbing filter for ensuring effective filtering of remaining unwanted light. This segmentation allows each filter to specialize in one aspect of the filtering problem, resolving the contradiction between heat resistance and filtering effectiveness.
Solution Approach 2:
The invention uses a composite filtering system combining two different types of filters (dichroic and absorbing) with different operating principles. The dichroic filter provides thermal management through reflection, while the absorbing filter ensures spectral purity through absorption, creating a composite solution that achieves both heat resistance and filtering effectiveness.
2Power
If light energy is increased for better treatment, then treatment efficacy improves, but filter heating increases causing damage
Solution Approach 1:
The filtering system is segmented into a dichroic filter that reflects unwanted wavelengths (reducing heat absorption) and an absorbing filter that absorbs remaining unwanted light. This segmentation allows high light energy to pass through the dichroic filter's passband without excessive heating, while still achieving effective filtering of unwanted wavelengths.
Solution Approach 2:
The invention converts the harmful effect of high light energy causing filter heating into a benefit by using the dichroic filter's reflective property. The dichroic filter reflects unwanted wavelengths away from the absorbing filter, converting what would be harmful heat energy into reflected light that does not contribute to heating the absorbing filter.
3Manufacturing precision
If a single absorbing filter is used for filtering, then filtering is achieved, but energy dissipation is high causing excessive heating
Solution Approach 1:
The filtering function is segmented between a dichroic filter that handles the bulk of unwanted wavelength rejection through reflection (low energy dissipation) and an absorbing filter that handles remaining filtering needs. This segmentation significantly reduces energy dissipation compared to using a single absorbing filter for all filtering tasks.
Solution Approach 2:
The dichroic filter acts as an intermediary that pre-processes the light by reflecting unwanted wavelengths before the light reaches the absorbing filter. This intermediary action reduces the energy burden on the absorbing filter, allowing it to operate more efficiently with lower energy dissipation.
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 enables increased light energy emission without overheating the filters or risking skin burns, allowing for higher fluence and improved treatment efficacy by selectively filtering light and preventing excessive energy absorption.
Implementation Method 1
a dichroic filter for filtering the light emitted by the flashlamp
Implementation Method 2
an absorbing filter... The light energy absorbed by the filter is relatively high
Implementation Method 3
The dichroic filter is formed on the absorbent filter, for example by a technique of vacuum deposition on the absorbent filter
Implementation Method 4
The dichroic filter and the absorbent filter, in particular when the dichroic filter is formed on the absorbent filter, are advantageously cooled by a circulation of liquid
Implementation Method 5
cooled by a circulation of liquid, for example the same liquid as that used to cool the flash lamp
Data Source
AI summary
The invention relates to a device for treating the skin with flashing light emissions, comprising a flashlight (2), a dichroic filter (3) for filtering the light emitted by the flashlight, an absorbing filter (4), arranged after the dichroic filter (3), charcterised in that the dichroic filter (3) is formed on the absorbing filter (4).