CN115067865A - High color rendering index endoscope laser light source system - Google Patents
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
- A61B1/0661—Endoscope light sources
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Abstract
The invention relates to the technical field of laser lighting, in particular to a high color rendering index endoscope laser light source system, which comprises a laser, a laser light source and a control circuit, wherein the laser is used for emitting laser; the heat dissipation device is arranged on the laser and used for dissipating heat of the laser; the fluorescence converter is arranged on the light emitting side of the laser and is used for absorbing the laser emitted by the laser and converting the laser into fluorescence; the lens group is arranged on the light emitting side of the fluorescence converter and is used for converging fluorescence and unconverted laser; the laser white light source obtained by mixing the blue laser and the fluorescence of the fluorescence converter has the advantages of small light-emitting area, high efficiency, long service life, proper color temperature and high color rendering index. The laser white light source with low optical expansion and the optical fiber have high coupling efficiency, and promote the miniaturization and development of the insertion part of the endoscope.
Description
Technical Field
The invention relates to the technical field of laser illumination, in particular to a high color rendering index endoscope laser light source system.
Background
The endoscope provides convenience for doctors to diagnose and treat patients since the invention, and becomes a necessary medical instrument for various departments such as surgery, respiratory department, digestive department, gynecology department and the like in hospitals. A commonly used illumination mode of an endoscope is to guide light from an external light source into a human body through an optical fiber light guide bundle. The endoscope needs to enter a human body for observation through a natural pore canal or an artificial small wound of the human body, the miniaturization of the endoscope can reduce surgical wounds, and the miniaturization of the endoscope is a development trend of the endoscope. The beam diameter of the light guide optical fiber is reduced, and the miniaturization of the endoscope can be promoted. However, the coupling efficiency of the small-beam-diameter optical fiber and the light source is low, which causes the problems of insufficient illumination brightness and energy waste. A low etendue light source is therefore required to couple to an optical fiber with high efficiency. Meanwhile, the color temperature and the color rendering index of the light source and the definition of the observed image are determined, so that the diagnosis of the patient by the doctor is influenced.
The national medical industry standard YY-1081-2011 requires that the color rendering index of the endoscope light source is more than 90 and the color temperature is 3000-7000K. The existing endoscope light source is a xenon lamp and an LED, the color rendering of the xenon lamp is good, the brightness is high, but the service life of the xenon lamp is short; although the LED has a long life, it has low luminance and a large light emitting area. Therefore, a light source with low etendue, good color rendering, appropriate color temperature, and high brightness is highly required to advance the miniaturization of the endoscope.
Disclosure of Invention
In order to solve the problems, the invention provides a high-color-rendering-index endoscope laser light source system, which applies a high-color-rendering-index laser white light source to an endoscope and promotes the miniaturization development of the endoscope.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a high color rendering index endoscope laser light source system comprising:
a laser for emitting laser light;
the heat dissipation device is arranged on the laser and used for dissipating heat of the laser;
the fluorescence converter is arranged on the light emitting side of the laser and is used for absorbing the laser emitted by the laser and converting the laser into fluorescence;
and the lens group is arranged on the light-emitting side of the fluorescence converter and is used for converging fluorescence and unconverted laser.
Further, the laser emits laser with the wavelength of 440 nm-460 nm, and the fluorescence converter absorbs the laser and converts the laser into fluorescence with the wavelength of 460 nm-800 nm.
Further, the fluorescence converter is a transmission-type fluorescence converter or a reflection-type fluorescence converter.
Further, the transmission-type fluorescence converter is a fluorescent film composite transparent heat-conducting substrate; the reflective fluorescence converter is a fluorescent ceramic composite fluorescent film or a multilayer fluorescent film composite heat conduction substrate which is of a double-layer or multilayer structure.
Further, the fluorescent film comprises a fluorescent material and a transparent adhesive; the transparent adhesive is any one of inorganic glue, silica gel and glass powder.
Furthermore, the fluorescent material in the fluorescent converter is at least two of cyan, green, yellow, orange and red fluorescent powder, wherein the dominant wavelength of the cyan fluorescent powder is 470-500 nm; the dominant wavelength of the green fluorescent powder is 500nm to 540 nm; the dominant wavelength of the yellow fluorescent powder is 540nm to 570 nm; the dominant wavelength of the orange fluorescent powder is 570-620 nm; the dominant wavelength of the red fluorescent powder is 620 nm-660 nm.
Furthermore, the fluorescent film also comprises a second phase, wherein the second phase is air holes and Al 2 O 3 、 SiO 2 、TiO 2 And BN.
Furthermore, the heat conducting substrate of the reflective fluorescent converter is any one of a metal plate, a ceramic plate and a single crystal substrate.
Further, the heat dissipation device is any one or more of a heat dissipation fin, an air cooling heat dissipation device and a liquid cooling heat dissipation device; the lens group is an aspheric lens group.
Furthermore, the color rendering index of the light source is larger than 90, and the color temperature is 3000-7000K.
The invention has the following advantages:
1) the laser white light source obtained by mixing the blue laser and the fluorescence of the fluorescence converter has the advantages of small light emitting area, high efficiency, long service life, proper color temperature and high color rendering index. The laser white light source with low optical expansion and the optical fiber have high coupling efficiency, and promote the miniaturization and development of the insertion part of the endoscope. The endoscope adopts the laser white light source, the advantages of long service life, good observation effect, low power consumption and small size of the endoscope insertion part can be obtained, and the laser white light source can be an upper-level substitute of the existing xenon lamp light source or LED light source.
2) In the present invention, a transmission or reflection type fluorescence converter is used. The transmission-type fluorescence converter realizes the adjustability of color temperature on the premise that the color rendering index is larger than 90, and can meet different color temperature requirements in different use environments. Solves the problem that high color rendering index is difficult to obtain at high color temperature. In the reflection type structure, a double-layer or multi-layer structure is invented, the problem of spectrum adjustment in the reflection structure is successfully solved by regulating and controlling the absorption effect among fluorescent materials, and laser white light with high color rendering index and moderate color temperature is obtained. Secondly, the ceramic or heat dissipation substrate in the structure can conduct heat rapidly, so that the fluorescent converter is maintained at a lower temperature, and color coordinate drift is reduced while high luminous efficiency is maintained.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a high color rendering index endoscope laser light source system;
FIG. 2 is a schematic diagram of the structure of the fluorescence converter prepared in example 1;
FIG. 3 is a schematic diagram of the structure of the fluorescence converter prepared in example 2;
FIG. 4 is a CaAlSiN representation of the fluorescent converter prepared in example 2 3 :Eu 2+ Fluorescent thin film and CaAlSiN 3 :Eu 2+ Comparing the performance of the fluorescent powder with a histogram;
FIG. 5 is a white luminous flux and luminous efficiency line graph of a fluorescence converter prepared in example 2 under the excitation of 450nm laser;
FIG. 6 is a schematic diagram of the double-layer structure of the reflective fluorescence converter in example 4.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Referring to the attached drawing 1, the high color rendering index endoscope laser light source system provided by the invention has a light source color rendering index of more than 90 and a color temperature of 3000K to 7000K, and comprises:
the laser 1 is used for emitting laser with the wavelength of 440 nm-460 nm;
the heat dissipation device 3 can be any one or more of a heat dissipation sheet, an air cooling heat dissipation device and a liquid cooling heat dissipation device, is arranged on the laser 1 and is used for heat dissipation of the laser;
a fluorescence converter 2 disposed on the light-emitting side of the laser 1 for absorbing the laser light emitted from the laser 1 and converting it into fluorescence;
the lens group 4 is an aspheric lens group, disposed on the light emitting side of the fluorescence converter 2, and configured to converge fluorescence and unconverted laser light. Specifically, the laser 1 emits laser with a wavelength of 440nm to 460nm, the laser is emitted onto the fluorescence converter 2, the fluorescence converter 2 converts fluorescence with a wavelength of 460nm to 800nm, and the fluorescence and unconverted laser are mixed by the lens assembly 4 and focused to a small spot.
The fluorescence converter is a transmission-type fluorescence converter or a reflection-type fluorescence converter. The transmission-type fluorescence converter is a fluorescent film composite transparent heat-conducting substrate; the reflective fluorescence converter is a fluorescent ceramic composite fluorescent film or a multilayer fluorescent film composite heat-conducting substrate (the heat-conducting substrate is any one of a metal plate, a ceramic plate and a single crystal substrate), and is of a double-layer or multilayer structure.
The fluorescent film comprises a fluorescent material and a transparent adhesive; the transparent adhesive is any one of inorganic adhesive, silica gel and glass powder. A second phase can be added into the fluorescent film; the second phase is pore and Al 2 O 3 、SiO 2 、TiO 2 And BN.
The fluorescent material in the fluorescent converter is at least two of cyan, green, yellow, orange and red fluorescent powder, wherein the dominant wavelength of the cyan fluorescent powder is 470-500 nm; the dominant wavelength of the green fluorescent powder is 500nm to 540 nm; the dominant wavelength of the yellow fluorescent powder is 540nm to 570 nm; the dominant wavelength of the orange fluorescent powder is 570-620 nm; the dominant wavelength of the red fluorescent powder is 620 nm-660 nm.
Specifically, the fluorescent converter 2 selects fluorescent powders (at least two fluorescent powders of cyan, green, yellow, orange and red fluorescent powders) with different emission wavelengths, and respectively sinters each fluorescent powder into fluorescent ceramic or mixes the fluorescent ceramic with a transparent adhesive (one of inorganic adhesive, silica gel and glass powder) to prepare a fluorescent film, and the fluorescent ceramic or the fluorescent film with different emission wavelengths is bonded into a complex phase material. When the complex phase material does not contain fluorescent ceramic, bonding the complex phase material and a heat conduction substrate (the heat conduction substrate comprises a metal plate, a ceramic plate and a single crystal substrate) into a fluorescent converter with a double-layer or multi-layer structure; when the complex phase material contains a fluorescent ceramic, the complex phase material may be selected to be directly used as the fluorescent converter 2.
Example 1
The transmissive fluorescent converter in this embodiment includes a sapphire substrate, glass, YAGG phosphor, and CASN phosphor. Wherein the mass ratio of YAGG fluorescent powder to CASN fluorescent powder is 6:1, and the mass ratio of the fluorescent powder to glass is PtG which is 6:1, 5:1, 4:1, 3:1 and 2:1 respectively. Mixing glass and fluorescent powder, coating the mixed slurry on a sapphire substrate by a doctor blade, controlling the thickness of the doctor blade to be 60 mu m and 105 mu m respectively, sintering at high temperature, melting the glass to wrap the fluorescent powder, and forming a glass film to be bonded on the sapphire substrate.
The following table 1 shows the color temperature and color rendering index of white light obtained by the excitation of the transmission type fluorescence converter by the laser of 450nm in this embodiment.
TABLE 1
Under the excitation of 450nm laser, the thickness of the glass film on the fluorescent converter is 105 μm, and when the mass ratio PtG of the fluorescent powder to the glass is from 2:1 to 6:1, white light with the color temperature of 2500K-3700K and the color rendering index of more than 95 is obtained. When the thickness of the glass film on the fluorescent converter is 60 μm and the mass ratio PtG of the fluorescent powder to the glass is from 3:1 to 6:1, white light with a color temperature of 4000K-5637K and a display index higher than 90 is obtained.
The contrast shows that the color temperature of the white light is improved along with the reduction of the thickness of the film and the reduction of the concentration of the fluorescent powder. However, when the thickness of the glass film is 60 μm and PtG is 2:1, the blue light intensity in the white light is strong because of low fluorescence conversion rate, and the color temperature of the white light is more than 10000K, and the color rendering index is less than 90. White light with a color rendering index higher than 90 and a color temperature higher than 6000K cannot be obtained.
Example 2
In order to obtain white light with a color temperature higher than 6000K and a color rendering index greater than 90, the transmissive fluorescence converter of this embodiment is introduced with second phase Al 2 O 3 Examples include sapphire substrate, glass, and Al 2 O 3 YAGG fluorescent powder and CASN fluorescent powder. Wherein the mass ratio of YAGG fluorescent powder to CASN fluorescent powder is 6:1, and the mass ratio of the fluorescent powder to the glass is controlled (1:1 is not less than PtG is not more than 3: 1); controlling the thickness of the glass film to be 55-70 μm; control of second phase Al 2 O 3 Content wt% (0<wt% is less than or equal to 40) to obtain the fluorescent converters with different color rendering indexes and color temperatures. As shown in fig. 3 and 4, the transmissive fluorescent converter introduces different contents of alumina to withstand the effects of laser saturation power density and color rendering index.
The following table 2 shows the color temperature and color rendering index of white light obtained after the color temperature adjustable high-color-rendering-index transmission-type fluorescence converter is excited by 450nm laser.
TABLE 2
Since the white light is not high in color rendering index due to the low fluorescence intensity required for high color temperature, white light with high color temperature (CCT > 6000K) and high rendering index (Ra > 90) is difficult to obtain for the transmission type fluorescence converter. However, as can be seen from the test data of examples 1-2 (see tables 1-2), when the transmissive fluorescent converter is used in the present invention, the color temperature can be continuously adjusted (2400K. ltoreq. CCT. ltoreq. 6300K) at high color rendering index (Ra > 90) by reasonably setting the layered structure, components and process.
Example 3
As shown in FIG. 5, the fluorescence converter of the present embodiment comprises Lu 3 Al 5 O 12 :Ce 3+ (LuAG) fluorescent ceramic 211 and CaAlSiN 3 :Eu 2+ (CASN) fluorescent film 212. Mixing Lu 2 O 3 、Al 2 O 3 、CeO 2 The powder is weighed according to the stoichiometric ratio, 0.5 percent of tetraethoxysilane is added as a sintering aid, the mixture is uniformly mixed and dried, and the mixture is pressed into a wafer under the pressure of 20MPa and then is subjected to cold isostatic pressing under the pressure of 250 MPa. Sintering the powder compact in vacuum at 1720-1780 ℃ for 5h under 103Pa, and then annealing at 1450 ℃ for 10h in air environment to obtain Lu 3 Al 5 O 12 :Ce 3+ A fluorescent ceramic 211.
Adding CaAlSiN 3 :Eu 2+ The fluorescent powder and the inorganic glue are stirred and mixed to obtain uniform slurry, and the slurry is scraped and coated on the Lu by a scraper 3 Al 5 O 12 :Ce 3+ Curing the fluorescent ceramic 211 in a vacuum oven at 70 ℃ for 1h to obtain CaAlSiN 3 :Eu 2+ Fluorescent film 212 and Lu 3 Al 5 O 12 :Ce 3+ The fluorescent ceramic 211 is a tightly bonded complex phase material, which is used as a fluorescent converter.
Example 4
Referring to FIG. 6, the fluorescence converter of the present embodiment comprises a highly thermally conductive aluminum substrate 221 and CaAlSiN 3 :Eu 2+ Fluorescent film 222 and Lu 3 Al 5 O 12 :Ce 3+ A fluorescent film 223. Adding CaAlSiN 3 :Eu 2+ The fluorescent powder (0.1g) and the inorganic adhesive (0.2g) are stirred and mixed to obtain uniform slurry, the slurry is coated on the aluminum substrate 221 by a scraper, the coating thickness is 30 mu m, and the curing is completed in a vacuum oven at 70 ℃ for 1 h.
Mixing Lu 3 Al 5 O 12 :Ce 3+ Phosphor powder (0.16g) and inorganic glue (0.2g) were stirred and mixed to obtain a uniform slurry, which was then knife-coated on CaAlSiN 3 :Eu 2+ And (3) coating the fluorescent film 222 with the thickness of 30 micrometers, and curing in a vacuum oven at 70 ℃ for 1 hour to obtain the double-layer reflection type fluorescent converter.
Under the excitation of the blue laser with the wavelength of 450nm, the fluorescence emitted by the fluorescence converter is mixed with the laser to obtain white light with the color temperature of 5300K and the color rendering index of 91, and the white light is extremely suitable for being used as an endoscope light source.
Table 3 shows the color temperature and color rendering index of the single layer reflective fluorescent converter compared to the two layer reflective fluorescent converter of example 4.
TABLE 3
In table 3, the single-layer fluorescent converters 1 to 5 all comprise a high thermal conductivity aluminum substrate, fluorescent powder (0.26g) and inorganic glue (0.4 g); the preparation method comprises the steps of stirring and mixing 0.4g of fluorescent powder inorganic glue to obtain uniform slurry, coating the slurry on an aluminum substrate by a scraper, wherein the coating thickness is 60 mu m, and curing the slurry in a vacuum oven at 70 ℃ for 1 h. Wherein the fluorescent powder is prepared from Lu 3 Al 5 O 12 :Ce 3+ And CaAlSiN 3 :Eu 2+ Are mixed according to the mass ratio of 5-9: 1.
As can be seen from Table 3, compared with the single-layer fluorescent film, the multi-layer fluorescent film prepared by the invention has the advantages of higher color rendering index, lower color temperature, CCT (continuous clear temperature) of 3000-7000K, and suitability for being used as an endoscope light source.
The high color rendering index endoscope laser light source system prepared by the scheme of the invention can realize the adjustment of the color temperature between 3000K and 7000K under the condition of high color rendering index (Ra is more than 90), so that the prepared laser light source system can be suitable for different organ examinations, has strong applicability and is suitable for further popularization and application.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the present invention as defined by the appended claims.
Claims (10)
1. A high color rendering index endoscope laser light source system, comprising:
a laser for emitting laser light;
the heat dissipation device is arranged on the laser and used for dissipating heat of the laser;
the fluorescence converter is arranged on the light emitting side of the laser and is used for absorbing the laser emitted by the laser and converting the laser into fluorescence;
and the lens group is arranged on the light-emitting side of the fluorescence converter and is used for converging fluorescence and unconverted laser.
2. The high color rendering index endoscope laser light source system according to claim 1, wherein the laser emits laser light with a wavelength of 440nm to 460nm, and the fluorescence converter absorbs the laser light and converts it into fluorescence with a wavelength of 460nm to 800 nm.
3. The high color rendering index endoscope laser light source system according to claim 1, wherein the fluorescence converter is a transmissive fluorescence converter or a reflective fluorescence converter.
4. The high color rendering index endoscope laser light source system according to claim 3, wherein the transmission-type fluorescence converter is a fluorescent thin film composite transparent heat conducting substrate; the reflective fluorescence converter is a fluorescent ceramic composite fluorescent film or a multilayer fluorescent film composite heat-conducting substrate which is of a double-layer or multilayer structure.
5. The high color rendering index endoscope laser light source system according to claim 4, wherein the fluorescent film comprises a fluorescent material and a transparent adhesive; the transparent adhesive is any one of inorganic adhesive, silica gel and glass powder.
6. The laser light source system of the endoscope with the high color rendering index as claimed in claim 1 or 5, wherein the fluorescent material in the fluorescent converter is at least two of cyan, green, yellow, orange and red fluorescent powders, wherein the dominant wavelength of the cyan fluorescent powder is 470nm to 500 nm; the dominant wavelength of the green fluorescent powder is 500nm to 540 nm; the dominant wavelength of the yellow fluorescent powder is 540nm to 570 nm; the dominant wavelength of the orange fluorescent powder is 570-620 nm; the dominant wavelength of the red fluorescent powder is 620 nm-660 nm.
7. The high color rendering index endoscope laser light source system according to claim 5, wherein the fluorescent film further comprises a second phase, the second phase is air hole, Al 2 O 3 、SiO 2 、TiO 2 And BN.
8. The high color rendering index endoscope laser light source system according to claim 4, wherein the heat conducting substrate of the reflective fluorescence converter is selected from any one of a metal plate, a ceramic plate and a single crystal substrate.
9. The high color rendering index endoscope laser light source system according to claim 1, wherein the heat sink is selected from any one or more of a heat sink, an air-cooled heat sink, and a liquid-cooled heat sink; the lens group is an aspheric lens group.
10. The high color rendering index endoscope laser light source system according to claim 1, characterized in that the light source color rendering index is larger than 90 and the color temperature is between 3000K and 7000K.
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| CN105467737A (en) * | 2015-12-29 | 2016-04-06 | 海信集团有限公司 | Laser light source device and laser projection equipment |
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