A medical backlight source and its preparation method and application

Abstract

The present invention relates to the field of medical backlight sources, and in particular to a medical backlight source and its application. A structure of a medical backlight source comprises: a chip located at an internal core position, and a first fluorescent layer and a second fluorescent layer located to sequentially wrap the exposed surface of the chip. The present application provides a medical backlight source, which is a CSP backlight source with a flat spectrum in the 600-720nm band, does not require the use of an additional filter, has a simple structure, and is easy to prepare.

Description

Technical Field

[0001] The invention relates to the field of medical backlight sources, and in particular to a medical backlight source and application thereof. Background Art

[0002] Skin ulcers are common after radiotherapy and chemotherapy, and wound healing is poor after surgery. The healing time is long, which brings great pain to patients physically and mentally. Photodynamic therapy is a physical intervention therapy widely used in clinical practice. Studies have reported that red light with a wavelength of 600-700nm can directly act on blood vessels, nerve endings and subcutaneous tissue, improve cell metabolism, increase glycogen and protein biosynthesis, and promote cell synthesis and wound healing.

[0003] However, in the prior art, the wavelength of the light source device of 600~700nm is not flat enough in the red light band, which will affect the final healing effect during actual use. Therefore, the existing medical light sources will choose to use filters for adjustment so that the light source meets the above requirements. The prior art CN204654869U provides a LED medical cold light source, which adopts a structure in which an aspherical reflector, an LED light group, a focusing lens and a filter are installed from right to left in the light source housing, which reduces the harm of the light source to the human body and improves the utilization rate of the light source. However, the use of filters complicates the overall structure and is costly.

[0004] Therefore, the present application provides a medical backlight source, which is a CSP backlight source with a flat spectrum in the 600-720nm band, does not require the use of an additional filter, has a simple structure, and is easy to prepare. Summary of the invention

[0005] In order to solve the above problems, the first aspect of the present invention provides a medical backlight source, the structure of which includes: a chip located at an internal core position, and a first fluorescent layer and a second fluorescent layer that sequentially wrap the exposed surface of the chip.

[0006] As a preferred solution, the chip is a blue light chip; the wavelength of the blue light chip is 400-500nm.

[0007] As a preferred solution, the wavelength of the blue light chip is 450-457.5 nm.

[0008] As a preferred solution, the thickness of the first fluorescent layer is 300-500 μm; the thickness of the second fluorescent layer is 350-450 μm.

[0009] As a preferred solution, the thickness of the first fluorescent layer is 380-400 μm; the thickness of the second fluorescent layer is 350-360 μm.

[0010] As a preferred solution, the first fluorescent layer comprises, by weight percentage, 40-60% of fluorescent powder and a packaging agent to supplement the balance.

[0011] As a preferred solution, the second fluorescent layer comprises, by weight percentage, 60-80% of fluorescent powder and a packaging agent to supplement the balance.

[0012] As a preferred solution, the encapsulant is at least one of LED encapsulation silica gels.

[0013] As a preferred solution, the wavelength of the phosphor is 600-750nm.

[0014] As a preferred solution, the first fluorescent layer includes, by mass percentage, 40-50% of 600-620nm phosphor, 4-5% of 630-640nm phosphor, 4-5% of 660-670nm phosphor and the remainder of encapsulant.

[0015] As a preferred solution, the first fluorescent layer comprises, by mass percentage, 45% of 600nm fluorescent powder, 4% of 630nm fluorescent powder, 5% of 660nm fluorescent powder and an encapsulant to supplement the balance.

[0016] As a preferred solution, the second fluorescent layer comprises, by weight percentage, 65-70% of fluorescent powder with a wavelength of 720 nm and an encapsulant to supplement the balance.

[0017] As a preferred solution, the second fluorescent layer comprises, by weight percentage, 69% of fluorescent powder with a wavelength of 720 nm and an encapsulant to supplement the balance.

[0018] The second aspect of the present invention provides a method for preparing the above-mentioned medical backlight source, comprising the following steps: (1) mixing and stirring the materials required for the first fluorescent layer in a corresponding proportion, and after stirring, making the mixture into a fluorescent film in a B-Stage state to obtain the first fluorescent layer; (2) preparing the second fluorescent layer in the same manner as step (1); (3) subjecting the first fluorescent layer obtained in step (1) to high-temperature vacuum pressing with a chip, cutting them into CSPs one by one, and testing the single CSP with a current of 350 mA to obtain a CSP with a spectrum of 600 nm to 660 nm; (4) subjecting the second fluorescent layer obtained in step (2) to high-temperature vacuum pressing with the CSP in step (3), cutting them into CSPs one by one, and testing the single CSP with a current of 350 mA to obtain a product with a flat spectrum in the 600 nm to 700 nm band.

[0019] As a preferred solution, the temperature during the high-temperature vacuum pressing process is 100-120° C., and the pressure is 6-8 kN; the time for the high-temperature vacuum pressing is 4-8 minutes.

[0020] As a preferred solution, the temperature during the high-temperature vacuum pressing process is 110° C. and the pressure is 6.4 kN; the time for the high-temperature vacuum pressing is 6 minutes.

[0021] In the present application, by adopting the superposition structure of the first fluorescent layer and the second fluorescent layer and using the fluorescent powder of a specific wavelength, the flatness of the backlight source in the 600~720nm band can be effectively improved. This is mainly because: the blue light chip with a specific wavelength of 450~457.5nm used in the present application can effectively improve its red light flatness in the 600~720nm band through the dispersion in the first fluorescent layer and the second fluorescent layer and the scattering effect of the fluorescent powder, especially when the mass ratio of the 600nm fluorescent powder, the 630nm fluorescent powder and the 660nm fluorescent powder in the first fluorescent layer is 4.5:0.4:0.5, the light scattered outward at this time can be further improved by the 720nm fluorescent powder of the second fluorescent layer, thereby extending its wavelength retention over a longer band distance.

[0022] A third aspect of the present invention provides an application of the above-mentioned medical backlight source, including application of the medical backlight source in the preparation of medical optical treatment instruments and medical optical detection instruments.

[0023] Beneficial effects:

[0024] 1. This application provides a medical backlight source, which is different from the existing medical backlight source. It can achieve a CSP backlight source with a flat spectrum in the 600nm~700nm band without using a filter, providing a more professional LED light source environment solution for the entire industry.

[0025] 2. This application provides a medical backlight source, the selection conditions of the fluorescent layer and the chip are simple, the cost is greatly reduced, and the preparation operation is simple, which also reduces labor and equipment costs.

[0026] 3. The present application provides a medical backlight source, which can realize a CSP backlight source with a flat spectrum in the 600nm~700nm band by utilizing a double-layer CSP preparation method, and the raw materials of the first fluorescent layer and the second fluorescent layer are simple. During the preparation, an effective medical backlight source structure can be formed only by high-temperature vacuum pressing, and the luminous performance is stable.

[0027] 4. The present application provides a medical backlight source, which uses a blue light chip with a specific wavelength of 450~457.5nm, which can be dispersed in the first fluorescent layer and the second fluorescent layer and scattered by the fluorescent powder, especially when the mass ratio of the 600nm fluorescent powder, the 630nm fluorescent powder and the 660nm fluorescent powder in the first fluorescent layer is 4.5:0.4:0.5. At this time, the light scattered outward can be further improved by the 720nm fluorescent powder in the second fluorescent layer.

[0028] 5. This application provides a medical backlight source with excellent market prospects, which can be widely used in the preparation of medical optical treatment equipment and medical optical detection equipment and is suitable for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the medical backlight structure prepared in Example 1 of the present application.

[0030] Figure 2 This is a schematic diagram of the medical backlight structure prepared in Example 2 of the present application.

[0031] Figure 3 This is a spectrum diagram of the wavelength band of the medical backlight source prepared in Example 1 of the present application.

[0032] Figure 4 This is a spectrum diagram of the wavelength band of the medical backlight source prepared in Example 2 of the present application.

[0033] In the figure:

[0034] 1-chip, 2-first fluorescent layer, 3-second fluorescent layer. DETAILED DESCRIPTION

[0035] Example 1

[0036] Embodiment 1 A first aspect provides a medical backlight source, such as Figure 1 As shown, its structure includes a chip 1, a first fluorescent layer 2 and a second fluorescent layer 3.

[0037] The thickness of the first fluorescent layer is 390 μm; the thickness of the second fluorescent layer is 350 μm.

[0038] Among them, the chip is a blue light chip with a wavelength of 455nm.

[0039] The first fluorescent layer includes, by mass percentage, 45% of 600nm fluorescent powder, 4% of 630nm fluorescent powder, 5% of 660nm fluorescent powder and a rest of an encapsulant.

[0040] The second fluorescent layer, in terms of mass percentage, comprises: 69% of 720nm wavelength fluorescent powder and a packaging agent to supplement the balance.

[0041] The encapsulant was LED encapsulation silica gel, purchased from Beijing Kangmeite Technology Co., Ltd.

[0042] Phosphor was purchased from Shandong Yingguang New Materials Co., Ltd.

[0043] The second aspect of the present embodiment provides a method for preparing the above-mentioned medical backlight source, comprising the following steps: (1) mixing and stirring the materials required for the first fluorescent layer in a corresponding proportion, and after stirring, making the mixture into a fluorescent film in a B-Stage state to obtain the first fluorescent layer; (2) preparing the second fluorescent layer in the same manner as step (1); (3) subjecting the first fluorescent layer obtained in step (1) to high-temperature vacuum pressing with a chip, cutting them into CSPs one by one, and testing the single CSP with a current of 350 mA to obtain a CSP with a spectrum of 650 nm; (4) subjecting the second fluorescent layer obtained in step (2) to high-temperature vacuum pressing with the CSP in step (3), cutting them into CSPs one by one, and testing the single CSP with a current of 350 mA to obtain a product with a flat spectrum in the 600 nm to 700 nm band.

[0044] The temperature during the high-temperature vacuum pressing process was 110° C., the pressure was 6.4 kN, and the time for the high-temperature vacuum pressing was 6 minutes.

[0045] Example 2

[0046] The specific implementation of this embodiment is the same as that of embodiment 1, except that: the medical backlight source, such as Figure 2 As shown, its structure includes a chip 1 and a first fluorescent layer 2 , but does not include a second fluorescent layer 3 .

[0047] The preparation method does not include steps related to the preparation of the second fluorescent layer 3.

[0048] Performance Evaluation

[0049] Spectrum test: The spectrum test of the light source formulations prepared in Examples 1 and 2 was performed. The test results are as follows: Figure 3~4 As shown, the flatness of the emission wavelength of Examples 1 and 2 in the 600-720 nm band was observed.

Claims

1. A medical backlight source, characterized in that: The structure of the medical backlight source includes: a chip located at an internal core position, and a first fluorescent layer and a second fluorescent layer located to sequentially wrap the exposed surface of the chip; The thickness of the first fluorescent layer is 390 μm; the thickness of the second fluorescent layer is 350 μm; Among them, the chip is a blue light chip with a wavelength of 455nm; The first fluorescent layer, in terms of mass percentage, comprises: 45% of 600nm fluorescent powder, 4% of 630nm fluorescent powder, 5% of 660nm fluorescent powder and a rest of encapsulant; The second fluorescent layer, in terms of mass percentage, comprises: 69% of 720nm wavelength fluorescent powder and a packaging agent to supplement the balance; The encapsulant is LED encapsulation silicone.

2. A method for preparing a medical backlight source according to claim 1, characterized in that: The method comprises the following steps: (1) mixing and stirring the materials required for the first fluorescent layer in a corresponding proportion, and after stirring, making the mixture into a fluorescent film in a B-Stage state to obtain the first fluorescent layer; (2) preparing the second fluorescent layer in the same manner as step (1); (3) performing high-temperature vacuum pressing on the first fluorescent layer obtained in step (1) and the chip, cutting them into CSPs one by one, and using a 350 mA current to test the single CSP to obtain a CSP with a spectrum of 600 nm to 660 nm; (4) performing high-temperature vacuum pressing on the second fluorescent layer obtained in step (2) and the CSP in step (3), cutting them into CSPs one by one, and using a 350 mA current to test the single CSP to obtain a product with a flat spectrum in the 600 nm to 700 nm band.

3. The method for preparing a medical backlight source according to claim 2, characterized in that: The temperature during the high-temperature vacuum pressing process is 100-120° C., and the pressure is 6-8 kN; the time of the high-temperature vacuum pressing is 4-8 minutes.

4. An application of the medical backlight according to claim 1, characterized in that: This includes the application of the medical backlight source in the preparation of medical optical treatment equipment and medical optical detection equipment.

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