Narrow-spectrum LED ultraviolet light source for phototherapy instrument and phototherapy instrument

Abstract

According to the narrow-spectrum LED ultraviolet light source for the phototherapy instrument and the phototherapy instrument, ultraviolet light is filtered through a coated optical filter, so that narrow-spectrum LED ultraviolet light is obtained, the central wavelength and the minimum bandwidth of the narrow-spectrum LED ultraviolet light source are closer to those of a traditional fluorescent lamp tube light source and a traditional excimer light source, and therefore the narrow-spectrum LED ultraviolet light source can be applied to the phototherapy instrument. Therefore, the phototherapy instrument equipped with the narrow-spectrum LED ultraviolet light source is more alternative to the phototherapy instrument adopting the traditional light source in the market, and the advantages of high safety and various output light source shapes of the ultraviolet LED light source can be better exerted.

Description

Technical Field

[0001] The utility model relates to an ultraviolet light therapy device, in particular to a narrow-spectrum LED ultraviolet light source for the light therapy device and the light therapy device. Background Art

[0002] Ultraviolet radiation therapy refers to a physical therapy technique that uses ultraviolet rays to irradiate the human body to prevent and treat diseases. It is one of the basic methods for the clinical treatment of various chronic skin diseases in dermatology, such as vitiligo and psoriasis. The clinical application of ultraviolet radiation therapy is also constantly improving with the continuous update of ultraviolet light sources.

[0003] In 1988, Philips of the Netherlands developed a fluorescent tube that can emit narrow-band UVB (NBUBB) 311nm. NBUVB has a significant effect in treating UV-sensitive diseases such as vitiligo and psoriasis, but has significantly fewer adverse reactions than PUVA therapy, so it quickly became popular in clinical practice. NBUVB ultraviolet light therapy has therefore become the basic treatment for a variety of chronic skin diseases in various clinical treatment guidelines.

[0004] In 1997, xenon chloride lasers and bulbs began to be used in dermatology clinics. Because the 308nm UVB they emit has a single wavelength, concentrated energy, and a wavelength shorter than 311nm, it has a stronger biological effect and can shorten the treatment course. Therefore, it is widely used in the treatment of localized vitiligo and psoriasis, commonly known as 308nm excimer laser ultraviolet phototherapy and 308nm excimer light ultraviolet phototherapy.

[0005] Since 2001, as light emitting diodes (LEDs) have been widely used in the lighting field, UV solid-state LED light sources have also begun to be developed and produced. UV LEDs have many advantages in the application of UV phototherapy products, including 1. Safety: Traditional Philips low-voltage fluorescent light sources and excimer light sources are glass lamps, and the driving voltage is high voltage; UV LEDs are completely the opposite, using safe materials and the driving voltage is even lower than the safety extra-low voltage; 2. Diversity of output light source shapes: UV LEDs are small in size and can be arranged to design treatment planes of any shape.

[0006] However, if Figure 1 As shown, taking UVB ultraviolet light therapy light source as an example, the LED light source has a wide output spectrum, which is quite different from traditional fluorescent tube light sources and excimer light sources, making it impossible for LED light sources on the market to replace other light sources. Utility Model Content

[0007] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to obtain narrow-spectrum LED ultraviolet rays for the phototherapy device so that its spectrum is close to that of the traditional fluorescent tube light source and the excimer light source.

[0008] To achieve the above-mentioned purpose, the utility model first provides a narrow-spectrum LED ultraviolet light source for a phototherapy device, wherein a coated filter is arranged outside the ultraviolet LED, and the coated filter can make the central wavelength of the spectrum of the LED ultraviolet light passing through the coated filter be between 290-320nm, and its half-wave width is between 1-10nm.

[0009] Furthermore, the narrow-spectrum LED ultraviolet light source includes a frame, an ultraviolet LED chip and the coated filter; the ultraviolet LED chip is fixedly arranged in the frame, and the coated filter is covered on the frame, so that the ultraviolet light emitted by the ultraviolet LED chip is filtered through the filter.

[0010] Furthermore, there are multiple ultraviolet LED chips.

[0011] Furthermore, the coated filter is coated with a bandpass filter film by vacuum coating.

[0012] Furthermore, the bandpass filter film is an interference filter film.

[0013] The utility model also provides a narrow-spectrum LED ultraviolet light therapy device, comprising the above-mentioned narrow-spectrum LED ultraviolet light source.

[0014] The utility model also provides another narrow-spectrum LED ultraviolet light therapy device, including an ultraviolet LED light source and a window, wherein a coated filter is arranged at the window, and the coated filter can make the central wavelength of the spectrum of the LED ultraviolet light passing through the coated filter be between 290-320nm, and its half-wave width be between 1-10nm.

[0015] The utility model obtains narrow-spectrum LED ultraviolet light by filtering ultraviolet light through a coated filter, whose central wavelength and minimum bandwidth are closer to traditional fluorescent tube light sources and excimer light sources, making phototherapy devices equipped with narrow-spectrum LED ultraviolet light sources more replaceable for phototherapy devices using traditional light sources in the market, thereby better utilizing the advantages of high safety and diverse output shapes of ultraviolet LED light sources.

[0016] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a spectrum comparison chart of conventional UV LED light source, conventional fluorescent tube light source, excimer light source and filtered narrow spectrum LED UV light source;

[0018] Figure 2 It is a structural schematic diagram of a narrow-spectrum LED ultraviolet light source in a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0019] The following describes several preferred embodiments of the utility model with reference to the drawings in the specification, so that the technical content is clearer and easier to understand. The utility model can be embodied in many different forms of embodiments, and the protection scope of the utility model is not limited to the embodiments mentioned in the text.

[0020] like Figure 2 As shown, the utility model first provides a narrow spectrum LED ultraviolet light source for a phototherapy device. The light source includes a frame 2, an ultraviolet LED chip 3 and a filter 1. The ultraviolet LED chip 3 can be one or more and is fixedly arranged in the frame 2. The filter 1 is covered on the frame 2 so that the light emitted by the ultraviolet LED chip 3 is filtered through the filter 1.

[0021] A bandpass filter film is coated on the glass substrate of the filter 1 by vacuum coating, so that the central wavelength of the spectrum of the LED output light source passing through the filter 1 is between 290-320nm and its half-wave width is between 1-10nm.

[0022] In one embodiment, the bandpass filter film adopts interference filters, and the specific structure is: a semi-transparent metal layer is coated on the glass bottom, followed by a magnesium fluoride interlayer, and then a semi-transparent metal layer. The two metal layers constitute the two parallel plates of the Fabry-Perot etalon. The metal layer can generally be made of Ta, Nb, Ti and Ag. When the interval between the two poles is of the same order of magnitude as the wavelength, the interference peaks of different wavelengths in the transmitted light are separated. Other absorption filter films can be used to filter out the light that is not allowed to pass through, thereby obtaining a narrow passband bandpass filter film, and its passband bandwidth is much narrower than that of ordinary absorption filters. For bandpass filter films that achieve specific wavelengths and bandwidths, domestic manufacturers can currently customize and purchase them according to customer needs.

[0023] In one embodiment, the ultraviolet spectrum after filtering is as follows Figure 1 As shown in , it can be seen that the spectrum of the LED light source after filtering is greatly narrowed, and is closer to the traditional fluorescent tube light source and excimer light source.

[0024] A light therapy device generally contains an ultraviolet LED light source and a window. In other embodiments, the coated filter can also be separately set at the window of the body of the light therapy device to achieve the above-mentioned filtering effect.

[0025] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. A narrow spectrum LED ultraviolet light source for a phototherapy device, characterized in that: A coated filter is arranged outside the ultraviolet LED, and the coated filter can make the central wavelength of the spectrum of the LED ultraviolet light passing through the coated filter be between 290-320nm, and the half-wave width be between 1-10nm.

2. The narrow spectrum LED ultraviolet light source for phototherapy apparatus according to claim 1, wherein: It includes a frame, an ultraviolet LED chip and the coated filter; the ultraviolet LED chip is fixedly arranged in the frame, and the coated filter is covered on the frame, so that the ultraviolet light emitted by the ultraviolet LED chip is filtered through the filter.

3. The narrow spectrum LED ultraviolet light source for phototherapy apparatus according to claim 2, wherein: There are multiple ultraviolet LED chips.

4. The narrow spectrum LED ultraviolet light source for phototherapy apparatus according to claim 1, wherein: The coated filter is coated with a bandpass filter film by vacuum coating.

5. The narrow spectrum LED ultraviolet light source for phototherapy apparatus according to claim 4, wherein: The bandpass filter film is an interference filter film.

6. A narrow spectrum LED ultraviolet light therapy device, characterized in that: It comprises a narrow spectrum LED ultraviolet light source as described in any one of claims 1-5.

7. A narrow spectrum LED ultraviolet light therapy device, comprising an ultraviolet LED light source and a window, characterized in that: A coated filter is arranged at the window, and the coated filter can make the central wavelength of the spectrum of the LED ultraviolet light passing through the coated filter be between 290-320nm, and the half-wave width be between 1-10nm.

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