UV Sterilizer Band Pass Filter and Absorbing Member Design
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Solution Overview
Problem
Existing ultraviolet sterilizers using excimer lamps emit harmful ultraviolet light in the 230 to 300 nm wavelength range, which can be transmitted by band pass filters at larger incidence angles, compromising the effectiveness of skin sterilization and medical treatments.
Innovation Solution
An ultraviolet sterilizer design incorporating a band pass filter and an ultraviolet absorbing member within the light guiding part to selectively block and absorb harmful light, ensuring high emission intensity of effective light in the 200 to 230 nm range while reducing ozone generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a band pass filter is used to block harmful ultraviolet light in the 230 to 300 nm wavelength range, then harmful light is reduced, but light at larger incidence angles is transmitted through the filter, compromising sterilization effectiveness
Solution Approach 1:
The light path is segmented into multiple sections with different filtering mechanisms. A band pass filter is placed at the first position to block harmful light at normal incidence, while a second band pass filter or ultraviolet absorbing member is placed at the second position to catch and absorb harmful light that passes through the first filter at larger incidence angles, ensuring comprehensive blocking without compromising sterilization effectiveness
Solution Approach 2:
An ultraviolet absorbing member is introduced as an intermediary element between the excimer lamp and the treated object. This member selectively absorbs harmful ultraviolet light in the 230 to 300 nm wavelength range while allowing effective sterilization light to pass through, thereby mediating between the need to block harmful light and maintain sterilization effectiveness
2Object-affected harmful factors
If multiple filtering components are added to block harmful light at various incidence angles, then harmful light is reduced, but device complexity increases
Solution Approach 1:
Multiple filtering functions are merged into a compact integrated structure. The band pass filter and ultraviolet absorbing member are positioned in sequence within the same optical path, combining their filtering capabilities into a unified system that achieves comprehensive harmful light blocking without requiring separate complex systems
Solution Approach 2:
The ultraviolet absorbing member serves multiple functions: it absorbs harmful ultraviolet light that passes through the band pass filter at larger incidence angles, and it can also serve as part of the housing or structural component of the device, thereby reducing overall device complexity while maintaining filtering effectiveness
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 harmful light emission without diminishing the intensity of effective ultraviolet light for sterilization, while also minimizing ozone generation outside the device.
Implementation Method 1
a band pass filter for reducing ultraviolet light in a wavelength region harmful to a human body is provided at least one of a position between the light guiding part and the lamp storage chamber and a position of a light outputting leading end of the light guiding part
Implementation Method 2
an inner surface of the light guiding part is formed from an ultraviolet absorbing member that absorbs the ultraviolet light in the wavelength region harmful to the human body
Implementation Method 3
a high-frequency high-voltage is applied between the outer electrode 55 and the inner electrode 56 by the high-frequency power source 59. This generates excimer discharge in the internal space S1, and so excimer light is thereby emitted
Data Source
AI summary
The present invention has as its object the provision of an ultraviolet sterilizer that can reduce ultraviolet light in a wavelength region of 230 to 300 nm, which is harmful to the human body, and can output effective light in a wavelength region of 200 to 230 nm with high emission intensity. The ultraviolet sterilizer of the present invention is an ultraviolet sterilizer comprising: an ultraviolet light source; a lamp storage chamber for storing the ultraviolet light source; and a light guiding part for guiding light from the ultraviolet light source, in which a band pass filter for reducing ultraviolet light in a wavelength region harmful to a human body is provided at least one of a position between the light guiding part and the lamp storage chamber and a position of a light outputting leading end of the light guiding part, and an inner surface of the light guiding part is formed from an ultraviolet absorbing member that absorbs the ultraviolet light in the wavelength region harmful to the human body.