LED light source for medical endoscope and spectrum design m

Time：2020-07-25 23:17 Click：/Second

LED light source for medical endoscope and spectrum design method
[Patent Abstract] The present invention discloses an LED light source for medical endoscopes and a spectral design method, including a blue light source, a cyan light source, a green light source, a yellow light source, a red light source and a current controller. The LED light source is composed of the above-mentioned various color light sources. The blue light source is composed of blue LED chips. The cyan light source, green light source, yellow light source and red light source are respectively composed of blue LED chip and corresponding cyan phosphor, green phosphor, and yellow. It is composed of phosphor, red phosphor and filter film, the filter film is a blue light filter film; the spectrum design method is: the LED light source and the reference light source are respectively irradiated to the human tissue and organ samples, the corresponding reflection spectrum is obtained by the test, and the color difference is calculated. According to the results, adjust the peak value and current of the chips and phosphors used in various light sources to achieve different spectral distributions, and repeat the calculation until the color difference is consistent. The obtained LED light source has high luminous intensity, full spectrum without loss, flexible control, strong color reduction, no ultraviolet and infrared parts, and is biologically friendly.
【Patent Description】
LED light source and spectrum design method for medical endoscope
Technical field
[0001] The present invention relates to an LED light source for medical endoscopes, which belongs to the field of medical special lighting.
【Background technique】
[0002] The light source used in medical endoscopes in the prior art is mainly a xenon lamp. The use time of the xenon lamp is only 500-1000 hours, the luminous efficiency is only tens of lumens per watt, the energy consumption is high, and the production and use costs are high. At the same time, there are high-intensity violet and infrared light in the spectrum of the xenon lamp. When used as an endoscope light source, it will cause burns to the tissues of the human body and cause high heat. With the development of LED light source technology, it has become a trend for LED light source to replace traditional light source in endoscopes. LED light source has small size, low heat dissipation, and low price. The optical structure and spectral distribution of the light source are easy to adjust. Convenience and other advantages, but the currently used LED light sources mainly focus on the optical structure design and heat dissipation structure design of the light source. There are no reports on the design of the spectrum. Because the endoscope is facing the tissues and organs of the human body during use, Because different tissues and organs have different colors, structures, and components, the spectrum of the light source required is also different. Therefore, it is necessary to design the light source spectrum according to the actual needs of the tissues and organs for different spectra to achieve the greatest degree of performance of the illuminated object. The true color is convenient for medical workers to judge.
[0003] Chinese patent CN101601572B discloses a cold light source device for medical endoscopes, which uses LED lights as light sources to prepare a light source device that includes a chassis, a light box, a fan, an output light hole mechanism, and dimming components, and has high brightness and long service life. The advantages of long, safe and reliable, but only the optical and thermal structure are described, the spectrum of the LED lamp used is not optimized, and the color reproduction ability in the actual application process is poor. Chinese patent CN202371523 discloses a multifunctional LED cold light source that achieves multifunctional and universal characteristics by setting a protection circuit and a universal light guide interface, but it does not mention the spectral characteristics of the LED light source used. Chinese patent CN102155715B discloses a A high-brightness LED cold light source device is designed to achieve a high-brightness illuminance of 25001m through structural design, and the spectral properties of the LED light source used for it are not designed and described.

[Content of the invention]

[0004] To solve the above technical problems, the purpose of the present invention is to provide an LED light source for medical endoscopes, which is composed of a blue light source, a cyan light source, a green light source, a yellow light source, a red light source, and a current controller. The LED light source is composed of the above-mentioned various color light sources. The blue light source is composed of blue LED chips. The cyan light source, green light source, yellow light source and red light source are respectively composed of blue LED chip and corresponding cyan phosphor, green phosphor, and yellow. It is composed of phosphor, red phosphor and filter film, and the filter film is a blue light filter film.
[0005] The emission peak of the blue LED chip is 400-480nm;
The emission peak of the cyan phosphor is 480-500nm, and the composition is (Sr, Ba, Pr, YbWi2O2N2: Eu or (Ba, M) N2Zn05: R, M is at least one of Mg, Ca, Sr, N It is one of La and Y, and R is at least one of Eu2+ and Bi3+;
The emission wavelength of the green phosphor is 500-540nm, and the composition is (Ba, Ca, La) S14: Eu or (Ba, M) N2ZnO5: R, M is at least one of Mg, Ca, Sr, N It is one of La and Y, and R is Eu2+ and Mn2+;
The emission wavelength of the yellow phosphor is 540-590nm, the composition is ￥3(41,6&)5012:(^ or (8&,10N2ZnO5: R, M is at least one of Mg, Ca, Sr, and N is One of La and Y, R is at least one of Ce3+ and Sm3+;
The emission wavelength of the red phosphor is 590-670nm, the composition is N2Zn05:R, M is at least one of Mg, Ca, Sr, N is one of La, Y, and R is Eu3+, Mn4+, Bi3+ At least one of; the spectrum of the blue light filter film forbidden to pass through the range of 400-480nm;
Another object of the present invention is to provide the above-mentioned method for designing the spectrum of the LED light source for medical endoscopes. The specific steps are: (1) irradiate the human tissue and organ sample with the LED light source and the reference light source respectively, and test to obtain the corresponding reflection spectrum;
(2) According to the reflection spectrum, calculate the corresponding color difference value;
(3) Adjust the emission peaks and currents of the chips and phosphors of various light sources according to the color difference value to achieve different spectral distribution performance, and repeat the calculation and adjustment until the color difference is consistent.
[0006] The reference light source is one of xenon lamp, D65, and halogen lamp.
[0007] Beneficial effects:
The LED light source and spectrum design method for medical endoscopes proposed by the present invention has the following advantages:
(1) Using a combination of blue light source, cyan light source, green light source, yellow light source, and red light source, the obtained LED light source is saturated without loss, and at the same time it is easy to adjust and transform the spectrum;
(2) The LED light source and the reference light source are respectively irradiated to the sample of human tissues and organs to measure the relationship of color difference, and the optimized spectrum obtained can more truly show the color essence of the sample;
(3) Compared with the traditional light source, the LED light source has the advantages of adjustable spectrum, energy saving and environmental protection, biological safety and low cost.
[0008]
【Explanation of drawings】
[0009] FIG. 1 is a flow chart of a method for spectral design of an LED light source for medical endoscopes;
【detailed description】
[0010] The present invention will be further described in detail in conjunction with implementation cases, but the scope of protection of the present invention is not limited to the content.
[0011] Example 1:
(1) Choose a blue light chip with 450nm emission wavelength as the excitation source, (Ba,Ca)La2Zn05:Eu2+cyan phosphor, (Ba,Sr)Y2ZnO5:Eu2+,Mn2+green phosphor, (Ba,Ca)La2ZnO5:Ce3+ Yellow phosphor and (Ba,Sr)La2ZnO5:Eu3+, Mn4+ red phosphor, blue light filter film, respectively prepared blue light source, cyan light source, green light source, yellow light source and red light source;
(2) Input different currents to prepare the LED light source; select the skin of the human arm as the test sample, first test the reflection spectrum of the sample under the irradiation of xenon lamp, and then illuminate the sample with the selected LED light source to test the corresponding reflection spectrum;
(3) Calculate the color difference based on the two spectra, and repeat the steps (1), (2) and (3) according to the size of the color difference value until the color difference value is consistent, and the spectrum design is completed.
【Sovereignty Item】
1. An LED light source for medical endoscopes, characterized in that it is composed of a blue light source, a cyan light source, a green light source, a yellow light source, a red light source and a current controller, and the LED light source is composed of the above-mentioned various color light sources , The blue light source is composed of blue LED chips, the cyan light source, green light source, yellow light source and red light source are respectively composed of blue LED chip and corresponding cyan phosphor, green phosphor, yellow phosphor, red phosphor and filter Film composition, the filter film is a blue light filter film. 2. The LED light source for medical endoscopes according to claim 1, wherein the emission peak of the blue LED chip is 400_480nm 3. The LED light source for medical endoscopes according to claim 1 The light source is characterized in that: the emission peak of the cyan phosphor is 480-500nm, the composition is (Sr, Ba, Pr, Yb) Si2O2N2: Eu or (Ba, M)N2Zn05: R, M is Mg, Ca, At least one of Sr, N is one of La and Y, and R is at least one of Eu2+ and Bi3+. 4. The LED light source for medical endoscopes according to claim 1, wherein the emission wavelength of the green phosphor is 500-540nm, and the composition is (Ba, Ca, La) Si04: Eu or (Ba, M) N2Zn05: R, M is at least one of Mg, Ca, and Sr, N is one of La and Y, and R is Eu2+ and Mn2+. 5. The LED light source for medical endoscopes according to claim 1, characterized in that: the emission wavelength of the yellow phosphor is 540-590nm, and the composition is Y3(Al,Ga)5012:Ce or ( Ba, M) N2Zn05: R, M is at least one of Mg, Ca, and Sr, N is one of La and Y*, and R is at least one of Ce3+ and Sm3+. 6. The LED light source for medical endoscopes according to claim 1, wherein the emission wavelength of the red phosphor is 590-670nm, and the composition is (Ca, Sr) SiAlN3: Eu or (Ba , DN2ZnO5: R, M is at least one of Mg, Ca, Sr, N is one of La, Y, and R is at least one of Eu3+, Mn4+, and Bi3+. 7. The method of claim 1 An LED light source for medical endoscopes, characterized in that: the spectrum forbidden pass range of the blue light filter film is 400-480 nm. The spectral design of the LED light source for medical endoscopes according to claim 1 The method is as follows: (1) Illuminate the human tissue and organ samples with the LED light source and the reference light source respectively, and test the corresponding reflection spectrum; (2) According to the reflection spectrum, calculate the corresponding color difference value; (3), Adjust the emission peaks and currents of the chips and phosphors used in various light sources to achieve different spectral distributions according to the size of the color difference, and repeat the calculation and adjustment until the color difference is consistent. 9. An LED light source for medical endoscopes as claimed in claim 8 The spectral design method is characterized in that: the reference light source is one of a gas lamp, a D65, and a tooth lamp.

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LED light source for medical endoscope and spectrum design m

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