CN115200703A - Light source detection device - Google Patents

Abstract

The application relates to a light source detection device, comprising: at least two light source parts, each of which is used for outputting emitted light; at least one dichroic mirror, the dichroic mirror has a first optical surface and a second optical surface, After each light source part emits light, the first optical surface is used for optical path integration of the corresponding emitted light to output a combined light, and the second optical surface is used for light quantity detection after splitting the emitted light. The above solution provided by the present application realizes light combining of multiple light source parts through the upper first optical surface of the dichroic mirror, and realizes light quantity detection after beam splitting of the emitted light through the upper second optical surface of the dichroic mirror. Spectroscopic detection can be realized without adding additional optical components, which effectively simplifies the system design.

Description

Light source detection device

technical field

The present invention relates to the technical field of endoscopes, and in particular, to a light source detection device.

Background technique

In the medical field, endoscopy has become a popular diagnostic method. The medical endoscope has an insertion part that is inserted into the human body, and the illumination light generated by the light source device is transmitted into the human body through the light guide for illumination, and the camera module at the front end of the insertion part takes pictures, and the corresponding image processor is used for image processing. processing, and finally image output through the display.

As an illuminating device that provides illuminating light for in vivo observation, LED (Light Emitting Diode) or LD (Laser Diode) solid-state light emitting devices have the advantages of low power consumption, long life, etc. instead of traditional xenon lamps and Halogen lamps are gradually being used in actual products. In the diagnosis of endoscopy, the white light observation mode is generally used to observe the overall shape of the surface of the living tissue. In addition, a variety of special light observation modes have been developed to strengthen the observation of blood vessels at different depths, thereby strengthening the screening of diseased tissue. Therefore, the lighting device is required to provide lighting modes with different spectral forms, such as: using LED as the light source of the light-emitting element, combining multiple LEDs, or using filters to achieve the above-mentioned white light or special light lighting output.

The camera module of the endoscope captures the observation image, which is processed by the image processing unit to generate a static or dynamic observation image, and the doctor diagnoses the lesion through the observation image. Since the spectral state of the illuminating light output by the illuminating device will affect the hue of the generated image, which has an important influence on the observation of lesions, it is of great significance to keep the spectrum or hue of the illuminating light output by the light source device stable. For the light source composed of LED as a light-emitting element, the change of the temperature of the LED itself will affect the amount of light emitted. Secondly, the temperature change will also cause a certain degree of wavelength shift of the LED, which will lead to the illumination light amount or/and spectrum cannot be kept constant; With the advancement of use time, the LED's own temperature (junction temperature) is too high during operation, which will lead to a certain degree of attenuation of its light output.

In order to facilitate the detection of the light output of the LEDs, the existing patent with the application number of CN201380001706.3 uses an illuminance sensor arranged on the side of the optical path space to receive the light emitted by each LED that is not used as the illuminating light or/and the optical element in the illuminating optical path. The reflected light is used to monitor the light quantity of the light-emitting element; the patent application number CN201410524810.7 and the patent application number CN201811007363.2 both use a beam splitter and a photodetector for spectroscopic detection; the patent application number CN209564106U does not use additional points The beam mirror performs light quantity monitoring, and collects parallel light leakage light that is not used for illumination by the first and second light-emitting elements.

However, the amount of light received by the illuminance sensor in the patent with application number CN201380001706.3 is relatively weak, so efficient light monitoring cannot be performed; application number CN201410524810.7 and application number CN201811007363.2 add additional beam splitting elements ( Beam splitting mirror), which also increases the complexity of the system; the application number CN209564106U detects the amount of light due to only collecting system light leakage, there may be a situation where the detection accuracy is low due to weak detection light, and it is impossible to monitor the light amount in real time.

Therefore, how to realize real-time light quantity monitoring with high precision and high dynamic range without adding additional optical elements has become a technical problem that those skilled in the art need to solve urgently.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a light source detection device, so as to realize real-time light quantity monitoring with high precision and high dynamic range without adding additional optical elements.

The application provides a light source detection device, comprising:

at least two light source parts, each of which is used for outputting emitted light;

At least one dichroic mirror, the dichroic mirror has a first optical surface and a second optical surface, after each of the light source parts emits light, the first optical surface is used to send the corresponding emitted light to the optical path After integration, synthetic light is output, and the second optical surface is used for light quantity detection after splitting the emitted light.

In one of the embodiments, the light source detection device further comprises at least one luminous flux measuring member for detecting the emitted light, the position of the luminous flux measuring member corresponds to the position of the light source part to be detected;

The second optical surface can enter the reflected light obtained by splitting the emitted light of the corresponding light source part into the luminous flux measuring element as detection light.

In one of the embodiments, the first optical surface on the dichroic mirror can only output synthesized light after optical path integration, or

The first optical surface on at least one of the dichroic mirrors can transmit light to detect the light quantity.

In one of the embodiments, a first optical zone and a second optical zone are provided on the first optical surface of at least one of the dichroic mirrors, and the first optical zone occupies an area of the first optical surface greater than or equal to 90%, the second optical zone occupies less than or equal to 10% of the area of the first optical surface;

The second optical zone is used to transmit the emitted light of the corresponding light source part, so that the emitted light enters the corresponding luminous flux measuring element.

In one embodiment, a dichroic filter film is disposed on the first optical zone; a beam splitter film is disposed on the second optical zone, or an anti-reflection film is disposed on the second optical zone.

In one of the embodiments, the photosensitive surface transmitted through the second optical zone to the corresponding luminous flux measuring element faces the direction of the detection optical axis of the dichroic mirror transmitted through the second optical zone.

In one of the embodiments, the size of the light beam transmitted through the second optical zone to the corresponding luminous flux measuring element is larger than the size of the photosensitive surface.

In one of the embodiments, the light-sensing surface of the corresponding luminous flux measuring element reflected by the second optical surface is arranged perpendicular to the direction of the detection optical axis of the dichroic mirror reflected by the second optical surface.

In one of the embodiments, the size of the photosensitive surface reflected by the second optical surface to the corresponding luminous flux measuring element is smaller than the size of the beam of the detection light corresponding to the light source part.

In one of the embodiments, a beam splitter film F3B is provided on the first optical surface of one of the dichroic mirrors; the beam splitter film F3B can transmit the emitted light of the corresponding light source part while reflecting, So that the transmitted light enters into the corresponding luminous flux measuring element.

In one embodiment, a dichroic filter film is disposed on the first optical surface of the dichroic mirror.

In one of the embodiments, the light source detection device further includes a background light detector, and the background light detector is located outside the range covered by the corresponding detection beam on the corresponding luminous flux measuring element.

In one of the embodiments, the light source detection device further includes an aperture diaphragm, and the front end of at least one of the luminous flux measuring pieces is provided with the aperture diaphragm.

In one embodiment, the light source detection device further includes an optical filter, and the front end of at least one of the luminous flux measuring elements is provided with the optical filter.

In one of the embodiments, there are multiple dichroic mirrors; beam splitting films are respectively provided on the second optical surfaces of the multiple dichroic mirrors, and the beam splitting films are used to perform the beam splitting process on the emitted light of the corresponding light source parts. For beam splitting, each beam splitting film is used for splitting emitted light of different wavelengths; the beam splitting wavelength range of the beam splitting film is determined by the wavelength of the emitted light.

In one of the embodiments, there are multiple dichroic mirrors; the second optical surfaces of the multiple dichroic mirrors are provided with the same beam splitting film; the same beam splitting film is used for beam splitting to be reflected by the second optical surface When the wavelength range of the emitted light reflected by the second optical surface is different, the beam splitting wavelength range of the same beam splitting film can cover the wavelength range of the emitted light with different wavelength bands.

In one of the embodiments, the beam splitting film can reflect less than or equal to 10% of the light beam and can transmit more than or equal to 90% of the light beam.

The beneficial effects of this application include:

The light source detection device provided by the present application realizes light combining of multiple light sources through the upper first optical surface of the dichroic mirror, and realizes light quantity detection after beam splitting of the emitted light through the upper second optical surface of the dichroic mirror. The device can realize spectroscopic detection without adding additional optical elements, which effectively simplifies the system design.

Description of drawings

FIG. 1 is a schematic structural diagram of an endoscope system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a first optical device according to an embodiment of the present application;

3A is a spectral curve diagram of each LED and a dichroic mirror in FIG. 2;

3B is a spectral curve diagram of the third dichroic mirror F3 in FIG. 2;

3C is a spectral curve diagram of the second dichroic mirror F2 in FIG. 2;

3D is a spectral curve diagram of the first dichroic mirror F1 in FIG. 2;

3E is a spectral curve diagram of the third dichroic mirrors F3 and F3B in the first optical device provided by an embodiment of the application;

4 is a schematic diagram of a detection optical path of a first optical device according to an embodiment of the present application;

FIG. 5A is a schematic diagram of the surface coating of the third dichroic mirror 33A in FIG. 4

5B is a schematic diagram of the positional structure of the first and second photoelectric sensors in FIG. 4;

5C is a schematic structural diagram of the position of the background light detector relative to the first and second photoelectric sensors according to an embodiment of the present application;

6 is a schematic diagram of a detection optical path of a second optical device according to an embodiment of the present application;

7A is a spectral curve diagram of each LED and a dichroic mirror in FIG. 6;

7B is a fourth dichroic mirror spectral curve diagram in FIG. 6;

Figure 7C is a third dichroic mirror spectral curve diagram in Figure 6;

Fig. 7D is the spectral curve diagram of the second dichroic mirror in Fig. 6;

Fig. 7E is the spectral curve diagram of the first dichroic mirror in Fig. 6;

7F is a spectral curve diagram of the second dichroic mirrors F2 and F2B in the second optical device provided by an embodiment of the application;

8 is a schematic diagram of a detection optical path of a second optical device according to an embodiment of the present application;

FIG. 9 is a schematic diagram of a detection optical path of a third optical device according to an embodiment of the present application;

Fig. 10 is the first dichroic mirror spectral curve diagram in Fig. 9;

FIG. 11 is a schematic diagram of an example of an optical path change detected by a third optical device according to an embodiment of the present application.

The figures are marked as follows:

11, the first LED light-emitting element; 12, the second LED light-emitting element; 13, the third LED light-emitting element; 14, the fourth LED light-emitting element; 15, the fifth LED light-emitting element; 21, the first collimating lens; 22, The second collimating lens; 23, the third collimating lens; 24, the fourth collimating lens; 25, the fifth collimating lens; 31, the first dichroic mirror; 32, the second dichroic mirror; 33, The third dichroic mirror; 34, the fourth dichroic mirror; 4, the focusing lens; 5, the light guide; 81, the first photoelectric sensor; 82, the second photoelectric sensor; 83, the third photoelectric sensor; 84, the first photoelectric sensor Four photoelectric sensors; 85, fifth photoelectric sensor; 100, light source detection device; 101, endoscope; 10, light combining module; 20, heat dissipation part; 30, image processing part; 40, control part; 50, light guide part ; 51, illuminating lens; 60, camera module; 70, input part; 80, display part.

Detailed ways

In order to make the above objects, features and advantages of the present application more clearly understood, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Back, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations on this application.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless expressly and specifically defined otherwise.

In this application, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

In this application, unless otherwise expressly stated and defined, a first feature "on" or "under" a second feature may be in direct contact with the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or an intervening element may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

In an embodiment of the present application, a light source detection device is provided, including: at least two light source parts and at least one dichroic mirror, wherein each light source part is used for outputting emitted light, and the dichroic mirror has a first optical After each light source part emits light, the first optical surface is used to integrate the corresponding emitted light in the optical path and output the synthesized light, and the second optical surface is used to detect the light quantity after splitting the emitted light.

The light source detection device in the present application is used for detection of a light source part in an endoscope, and below, the light source part of an endoscope is taken as an example for description.

By adopting the above technical solution, the light combining of multiple light source parts is realized through the upper first optical surface of the dichroic mirror, and the light quantity detection is realized after the emitted light is divided into beams through the upper second optical surface of the dichroic mirror. Spectroscopic detection can be realized by adding additional optical components, which effectively simplifies the system design.

In some embodiments, in order to be able to detect the split emitted light, the light source detection device further includes at least one luminous flux measuring element for detecting the emitted light, the position of the luminous flux measuring element corresponds to the position of the light source part to be detected; , the second optical surface can enter the reflected light obtained by splitting the emitted light of the corresponding light source part into the luminous flux measuring element as detection light.

Exemplarily, as shown in FIG. 4 , the luminous flux measuring element in this application includes a first photoelectric sensor 81, a third photoelectric sensor 83 and a fourth photoelectric sensor 84; the light source part includes a first LED light-emitting element 11 and a third LED light-emitting element 11. The element 13 and the fourth LED light-emitting element 14; the dichroic mirrors are the first dichroic mirror 31, the second dichroic mirror 32, and the third dichroic mirror 33;

As shown in FIG. 4 and in conjunction with FIG. 2 , the emitted light of the first LED light-emitting element 11 is split by the second optical surface 33B on the third dichroic mirror 33 and then enters the first photoelectric sensor 81 ; the third LED emits light. The emitted light of the element 13 passes through the second optical surface 32B on the second dichroic mirror 32 and then enters the third photoelectric sensor 83; the emitted light of the fourth LED light-emitting element 14 passes through the first dichroic mirror 31 The second optical surface 31B of the beam splits and enters the fourth photoelectric sensor 84 . Since the technical principle of measuring the luminous flux with the photoelectric sensor is in the prior art, it will not be repeated here.

Further, the luminous flux measuring elements in the present application correspond to the light source parts one by one, thereby realizing the detection of the light quantity of each light source part. It should be noted that, the number of the luminous flux measuring pieces can be selected according to the needs of the actual product, which is not limited here.

In some embodiments, the first optical surface on the dichroic mirror can only be integrated into the optical path to output synthetic light, or the first optical surface on at least one of the dichroic mirrors can transmit light to detect the light quantity. In practical applications, the first optical surface on the dichroic mirror still has a small amount of light leakage when the optical path is integrated. This application mainly describes the spectral characteristics of the first optical surface on the dichroic mirror.

Exemplarily, as shown in FIG. 2 in conjunction with FIG. 4 , the light source part in this application includes a first LED light-emitting element 11 , a second LED light-emitting element 12 , a third LED light-emitting element 13 and a fourth LED light-emitting element 14 ; The detection device includes a first dichroic mirror 31, a second dichroic mirror 32 and a third dichroic mirror 33; the luminous flux measuring element includes a first photoelectric sensor 81, a second photoelectric sensor 82, a third photoelectric sensor 83 and a third photoelectric sensor 83. Four photoelectric sensors 84. It can be understood that the luminous flux measuring components 81-84 have photoelectric sensors PD (Photo Diode). In other embodiments, other types of photodetecting elements can also be used.

The first LED light-emitting element 11 is a UV_LED that emits UV light in the violet to blue band, the second LED light-emitting element 12 is a B_LED that emits B light in the blue band, and the third LED light-emitting element 13 is a G_LED that emits G light in the green band. The fourth LED light-emitting element 14 is an R_LED of R light in the red wavelength band.

At the same time, UV_LED, according to the characteristics of hemoglobin having strong absorption to the 405-415nm band spectrum, preferably has a peak wavelength of 405-415nm, and its wavelength range is preferably a narrow band with a bandwidth of about 20nm. According to its high scattering and strong absorption characteristics, It is used to describe the shape of blood vessels near the superficial layer or the superficial layer; B_LED, preferably has a peak wavelength of 430-460 nm, and further, its peak wavelength is preferably 430-450 nm, through the difference in the reflectivity of the superficial blood vessels and the mucosa forms two on the observed image. To distinguish between them, its wavelength range is preferably narrowband, and its bandwidth is about 20nm; G_LED, preferably has a peak wavelength of 530-560nm, and its bandwidth can be selected to be wideband, such as a bandwidth of about 100nm, and G_LED is a fluorescent LED; R_LED, Preferably, it has a peak wavelength of 600-640 nm, and its wavelength range is preferably a narrow band with a bandwidth of about 20 nm.

Specifically, the third LED light-emitting element 13 is a phosphor excited by a blue LED to emit green light, namely a fluorescent G_LED, wherein the blue LED has blue excitation light with a peak wavelength of 410-440 nm, and is excited by the blue excitation light The fluorescent material generates green light, and a small amount of blue excitation light is not absorbed by the fluorescent material and directly transmits, so the emission spectrum of the third LED light-emitting element 13 not only includes the green band spectrum, but also includes a small amount of blue excitation light, which is green compared to its own emission. LED, fluorescent green LED is easier to achieve high output optical power.

In use, the first optical surface 32A on the second dichroic mirror 32 realizes the cut-off filtering of the blue laser light in the short wavelength band in the emission light of the G_LED, preventing the blue excitation light from entering the subsequent optical path, and the output illumination light of the G_LED and the The spectral bands of the B_LED components hardly overlap each other. By independently adjusting the proportion of the spectral components of each color, the control strategy of the spectrum and luminous flux is simplified, and the high-precision lighting color tone and luminous flux stability control are realized.

The spectral curves of the first LED light-emitting element 11 , the second LED light-emitting element 12 , the third LED light-emitting element 13 and the fourth LED light-emitting element 14 in this application are shown in FIG. 3A , the spectrum L1 corresponds to the UV_LED ultraviolet light spectrum, and the spectrum L2 corresponds to B_LED blue light spectrum, spectrum L3 corresponds to the mixed light spectrum of G_LED blue excitation light and (fluorescent) green light, and spectrum L4 corresponds to R_LED red light spectrum.

As shown in FIG. 3B and in conjunction with FIG. 2 , the first optical surface 33A on the third dichroic mirror 33 has a short-wave pass characteristic F3 with a wavelength of about 410-430 nm in the transition region, which is used to transmit UV_LED below 420 nm and reflect B_LED The light above 420nm completes the optical path integration of the violet light emitted by UV_LED and the blue light emitted by B_LED.

As shown in FIG. 3C and in conjunction with FIG. 2 , the first optical surface 32A on the second dichroic mirror 32 has a long-wavelength characteristic F2 with a wavelength of about 460-480 nm in the transition region, which is used to reflect UV_LED and B_LED below 470 nm And transmit the light of G_LED higher than 470nm, complete the optical path integration of violet light emitted by UV_LED, blue light emitted by B_LED and green light emitted by G_LED.

As shown in FIG. 3D and in conjunction with FIG. 2 , the first optical surface 31A on the first dichroic mirror 31 has a long-wave-pass characteristic F1 with a wavelength of about 590-610 nm in the transition region, which is used to reflect UV_LED, B_LED and G_LED lower than 600nm and transmits the light of R_LED higher than 600nm, after completing the optical path integration of the violet light emitted by UV_LED, the blue light emitted by B_LED, the green light emitted by G_LED and the red light emitted by R_LED, the synthesized light is output.

In this application, the UV_LED is spectrally separated from the B_LED through the long-wave cutoff of the first optical surface 33A on the third dichroic mirror 33 to achieve an independent spectrum B1 (≤420 nm); The short-wave cutoff of the first optical surface 33A and the long-wave cutoff of the first optical surface 32A on the second dichroic mirror 32 are spectrally separated to achieve an independent spectrum B2 (420-470 nm); G_LED passes through the second dichroic mirror 32 The short-wave cutoff of the first optical surface 32A and the long-wave cutoff of the first optical surface 31A on the first dichroic mirror 32 are spectrally separated to achieve an independent spectrum B3 (470-600nm); R_LED passes through the third dichroic mirror The short-wave cut-off (600nm) of the first optical surface 31A on the first optical surface 31A is spectrally separated to realize an independent spectrum B4 (≥600nm); wherein, the short-wave cut-off and long-wave cut-off in the present application are both relative to the specific light-emitting band, which is each The short-wave end and the long-wave end of the LED light-emitting band.

The first dichroic mirror 31 , the second dichroic mirror 32 and the third dichroic mirror 33 in the present application are used to realize the violet light emitted by UV_LED, the blue light emitted by B_LED, the green light emitted by G_LED and the red light emitted by R_LED After the optical path is integrated, the synthesized light can be output, and at the same time, the spectrum B1 to B4 of the UV_LED, B_LED, G_LED and R_LED component spectral curves that are independent of each other can be realized. As shown in FIG. 3A , the UV_LED, B_LED, G_LED and The spectral bands of the R_LED components almost do not overlap each other. By independently adjusting the ratio of the spectral components of each color, the control strategy of the spectrum and luminous flux is simplified, and the high-precision lighting color tone and luminous flux stability control are realized.

While the device outputs synthesized light, as shown in FIG. 4 and in conjunction with FIG. 2 , the emitted light of the first LED light-emitting element 11 is split by the second optical surface 33B on the third dichroic mirror 33 and then enters the first In the photoelectric sensor 81 ; the emitted light of the third LED light-emitting element 13 enters the third photoelectric sensor 83 after being split by the second optical surface 32B on the second dichroic mirror 32 ; the emitted light of the fourth LED light-emitting element 14 After being split by the second optical surface 31B on the first dichroic mirror 31 , the beams enter the fourth photoelectric sensor 84 . Since the technical principle of measuring the luminous flux with the photoelectric sensor is in the prior art, it will not be repeated here.

At the same time, the emitted light of the second LED light-emitting element 12 can enter the second photoelectric sensor 82 after being transmitted through the first optical surface 33A on the third dichroic mirror 33 . At this time, the second LED light-emitting element 12 can be detected. of emitted light.

Further, the emitted light of the third LED light-emitting element 13 in the embodiment of the present application can also be transmitted through the first optical surface 32A on the second dichroic mirror 32 , and then pass through the first optical surface 32A on the first dichroic mirror 31 . An optical surface 31A transmits a detection beam, which enters the corresponding photoelectric sensor 83 for measurement.

In the present application, through the design of different optical characteristics of the first optical surface and the second optical surface of the dichroic mirror, the light combining of multiple light source parts is completed, and the spectroscopic detection of the light emission of each light source part is realized without adding additional optical elements. The detection beam is obtained under the circumstance (such as beam-splitting mirror or other beam-splitting optical element) to realize spectroscopic detection, wherein the detection beam is a small amount of reflected and transmitted light passing through the first optical surface or the second optical surface of the dichroic mirror , with simplified system design and feedback control strategy.

In some embodiments, a first optical area R1 and a second optical area R2 are provided on the first optical surface of at least one dichroic mirror, and the first optical area R1 occupies 90% or more of the area of the first optical surface, The second optical area R2 occupies less than or equal to 10% of the area of the first optical surface; the second optical area R2 is used to transmit the emitted light of the corresponding light source part, so that the emitted light enters the corresponding luminous flux measuring element.

Exemplarily, in order to facilitate the detection of the luminous flux in the second LED light-emitting element 12, namely the B_LED, the first optical surface 33A of the third dichroic mirror 33 has the characteristics of partitioned coating, specifically, as shown in the left and right figures in FIG. 5A . , the present application is provided with a first optical zone R1 and a second optical zone R2 on the first optical surface 33A on the third dichroic mirror 33, and the first optical zone R1 and the second optical zone R2 have different coating characteristics , the first optical zone R1 occupies 90% or more of the area of the first optical surface, and the second optical zone R2 occupies 10% or less of the area of the first optical surface.

The first optical zone R1 is used to transmit the light beam with the wavelength lower than 420 nm on the first LED light-emitting element 11 and reflect the light beam with the wavelength greater than 420 nm on the second LED light-emitting element 12 to form composite light; the second optical zone R2 is used for transmitting the first LED light-emitting element 12. The outgoing light of the two LED light-emitting elements 12 makes the outgoing light enter the second photoelectric sensor 82 .

In use, the first optical area R1 has a dichroic filter film F3, the second optical area R2 is not coated, or the second optical area R2 is provided with a beam splitting film F5 that mainly transmits blue light emitted by the B_LED , or the second optical zone R2 is provided with an anti-reflection film F6 with anti-reflection properties, so that the light emitted by the B_LED can be transmitted and split into the corresponding second photosensor 82 through the second optical zone R2.

Further, as shown in FIG. 5A , the second optical zone R2 in the present application may be a square or a circle, and the design of the size and shape of the second optical zone R2 should match the size of the photosensitive surface of the second photoelectric sensor 82 That is, the transmitted light beam of the light emitted by B_LED through the second optical region R2 enters the photosensitive surface of the second photoelectric sensor 82 as detection light, and the detection light size is greater than or approximately equal to the photosensitive surface size of the second photoelectric sensor 82 .

In this application, when the second optical region R2 is not coated, according to the Fresnel reflection characteristics of the optical material, if BK7 optical glass is used as the base material of the third dichroic mirror 33, the region R2 has nearly 90% light transmittance The transmission rate of the light emitted by the B_LED can be achieved, which has the characteristics of simplifying the process.

In some embodiments, the photosensitive surface transmitted to the corresponding luminous flux measuring element through the second optical zone R2 is in the direction of the detection optical axis of the dichroic mirror transmitted through the second optical zone.

Exemplarily, as shown in FIG. 4 in conjunction with FIG. 5A , the direction of the light transmitted from the second optical zone R2 to the photosensitive surface of the second photosensor 82 is directed to the second LED light-emitting element 12 through the second optical zone of the dichroic mirror 33 . The direction of the optical axis (detecting optical axis) of the detection beam transmitted by R2, at the same time, the detection after the emission light of the second LED light-emitting element 12 is transmitted through the second optical zone R2 of the first optical surface 33A on the third dichroic mirror 33 The light beam directly irradiates the photosensitive surface on the second photoelectric sensor 82, so that the second photoelectric sensor 82 can optimally receive the corresponding detection light.

In some embodiments, the size of the beam transmitted to the corresponding luminous flux measuring element through the second optical region R2 is larger than the size of the photosensitive surface, and the detection beam of the second LED light-emitting element 12 completely covers the photosensitive surface of the second photosensor 82 .

Exemplarily, as shown in FIG. 4 in conjunction with FIG. 5A , the size of the light beam transmitted from the second LED light-emitting element 12 , namely the B_LED, to the second photosensor 82 through the second optical region R2 is larger than that of the photosensitive surface of the second photosensor 82 . size. Therefore, the detection light of the B_LED incident on the second photoelectric sensor 82 has a certain margin to cover the photosensitive surface of the second photoelectric sensor 82, so that the second photoelectric sensor 82 is not sensitive to the installation position, ensuring system reliability and controlling production. cost.

In some embodiments, the photosensitive surface of the corresponding luminous flux measuring element reflected by the second optical surface is disposed perpendicular to the direction of the detection optical axis of the dichroic mirror reflected by the second optical surface.

Exemplarily, as shown in FIG. 4 , the light in the vertical direction reflected by the first LED light-emitting element 11 through the second optical surface 32B on the third dichroic mirror 33 is the direction of the detection optical axis, and after the third The light in the vertical direction reflected by the second optical surface 32B on the dichroic mirror 33 is perpendicular to the photosensitive surface of the corresponding first photoelectric sensor 81 ; the photosensitive surface of the third photoelectric sensor 83 corresponds to the corresponding second dichroic The detection optical axis reflected by the second optical surface 32B on the mirror 32 is vertical;

In this application, since the photosensitive surfaces of the first photoelectric sensor 81 , the third photoelectric sensor 83 and the fourth photoelectric sensor 84 correspond to the second optical surface 33B on the third dichroic mirror 33 and the second optical surface 33B on the second dichroic mirror 32 The detection optical axis reflected by the second optical surface 32B of the first dichroic mirror 31 and the second optical surface 31B on the first dichroic mirror 31 are vertically arranged, so that the first photosensor 81, the third photosensor 83 and the fourth photosensor 84 The corresponding detection light is optimally received.

In some embodiments, the size of the photosensitive surface reflected by the second optical surface to the corresponding luminous flux measuring element is much smaller than the beam size of the detection light on the corresponding light source part.

Exemplarily, the size of the photosensitive surface on the first photosensor 81 is much smaller than the beam size of the detected light on the first LED light-emitting element 11 , and the size of the photosensitive surface on the third photoelectric sensor 83 is much smaller than the size of the detected light on the third LED light-emitting element 13 . The size of the light beam on the fourth photoelectric sensor 84 is much smaller than the size of the light beam detected on the fourth LED light-emitting element 14 .

Specifically, the size of the detection light beam reflected by the first LED light-emitting element 11 , the second LED light-emitting element 12 , the third LED light-emitting element 13 and the fourth LED light-emitting element 14 through the corresponding second optical surface is much larger than that of the corresponding first photoelectric The size of the photosensitive surfaces on the sensor 81, the second photoelectric sensor 82, the third photoelectric sensor 83 and the fourth photoelectric sensor 84 can make the luminous flux measuring element insensitive to the installation position, improve the reliability of the whole device, and reduce the production cost.

In order to avoid the spatial position interference of the first photoelectric sensor 81 and the second photoelectric sensor 82, as shown in FIG. 5B, in the design, the first photoelectric sensor 81 for receiving the reflected light from the second optical surface performs an appropriate spatial position shift to Avoid the space where the second photosensor 82 for receiving the transmission of the first optical surface is located. For example, the first photoelectric sensor 81 and the second photoelectric sensor 82 are shifted up and down or left and right in the detection optical path space. As shown in FIG. 5B , the diameter of the circle shown in the figure is the beam diameter of the detection optical axis, and the detection beam is the beam after the approximately collimated beams C1 to C4 are reflected by the second optical surface of the dichroic mirror. The first photoelectric sensor 81 and the second photoelectric sensor 82 are arranged side by side up and down or left and right to optimally receive the detection light of the first LED light-emitting element 11 and the second LED light-emitting element 12. After the first photoelectric sensor 81 is offset, it still meets the requirements of the second LED light-emitting element 12. The detected light beam completely covers the photosensitive surface of the second photoelectric sensor 82, and at this time, the received luminous flux is not lower than 90% of the original luminous flux.

In some embodiments, there are multiple dichroic mirrors; beam splitting films are respectively provided on the second optical surfaces of the multiple dichroic mirrors, and the beam splitting films are used for splitting the emitted light of the corresponding light source parts, Each beam splitting film is used to split the emitted light of different wavelengths; the beam splitting wavelength range of the beam splitting film is determined by the wavelength of the emitted light.

In the present application, the second optical surface 31B on the first dichroic mirror 31 , the second optical surface 32B on the second dichroic mirror 32 and the second optical surface 33B on the third dichroic mirror 33 all have Spectroscopic characteristics, through the beam splitting characteristics with reflection characteristics as the auxiliary and transmission characteristics as the main, that is, reflecting a small amount of light, transmitting most of the light, and realizing reflective beam splitting. When the reflective beam is irradiated into the corresponding photoelectric sensor, the corresponding Detection of LED luminous flux.

Specifically, the second optical surface 33B on the third dichroic mirror 33 in the present application has a third dichroic film FT3, which can have a partial reflection characteristic of less than or equal to 10% low reflection and greater than or equal to the violet light emitted by the UV_LED The transmission characteristic of 90% high transmission; the second optical surface 32B on the second dichroic mirror 32 has a second dichroic film FT2, which can have a partial reflection characteristic of less than or equal to 10% low reflection to the green light emitted by the G_LED and Transmission characteristics of greater than or equal to 90% high transmission; the second optical surface 31B on the first dichroic mirror 31 has a third dichroic film FT1, which can have a partial reflection of less than or equal to 10% low reflection to the red light emitted by the R_LED characteristics and transmission characteristics of 90% or more high transmission.

In use, less than or equal to 10% of the violet light emitted by the first LED light-emitting element 11, namely the UV_LED, is reflected by the second optical surface 33B on the third dichroic mirror 33, and part of the reflected light enters the corresponding first photoelectric In the sensor 81; the green light emitted by the third LED light-emitting element 13, that is, the G_LED, is less than or equal to 10% of the light quantity is reflected by the second optical surface 32B on the second dichroic mirror 32, and part of the reflected light enters the corresponding third In the photoelectric sensor 83; 10% or less of the red light emitted by the fourth LED light-emitting element 14, namely the R_LED, is reflected by the second optical surface 31B on the first dichroic mirror 31, and part of the reflected light enters the corresponding In the four photoelectric sensors 84, the detection of the luminous flux of UV_LED, G_LED and R_LED can be realized.

The second optical surface 33B on the third dichroic mirror 33, the second optical surface 32B on the second dichroic mirror 32, and the second optical surface 31B on the first dichroic mirror 31 in the present application can reflect less than or equal to 10% of the light quantity, or 5% or less of the reflected light quantity, according to the photosensitive characteristics of the photosensors 81-84, the device can ensure that the detected light quantity is kept at an appropriate level without sacrificing too much effective illumination light.

In some embodiments, there are multiple dichroic mirrors; the second optical surfaces of the multiple dichroic mirrors are provided with the same beam splitting film; the same beam splitting film is used to split the emitted light reflected by the second optical surface , when the wavelength bands of the emitted light reflected by the second optical surface are different, the wavelength range of the beam splitting film of the same beam splitting film can cover the wavelength range of the emitted light of different wavelengths.

Exemplarily, in the present application, the second optical surface 31B on the first dichroic mirror 31 , the second optical surface 32B on the second dichroic mirror 32 , and the second optical surface on the third dichroic mirror 33 The surfaces 33B are all provided with the same optical film FT4, which can be a wide-band beam splitter film. At the same time, the optical film FT4 covers at least the broadband (370-650 nm) of the above-mentioned UV_LED, G_LED and R_LED emission light bands. In the broad band range of 370-650 nm, it has a partial reflection characteristic of less than or equal to 10% low reflection and a transmission characteristic of greater than or equal to 90% high transmission. The same optical film FT4 is used in the embodiments of the present application, which simplifies the process and reduces the system cost.

In some embodiments, the light source detection device further includes an aperture diaphragm, wherein the front ends of the first photoelectric sensor 81 , the second photoelectric sensor 82 , the third photoelectric sensor 83 and the fourth photoelectric sensor 84 are provided with an aperture diaphragm.

The present application adjusts the amount of detected light incident to the first photoelectric sensor 81 , the second photoelectric sensor 82 , the third photoelectric sensor 83 and the fourth photoelectric sensor 84 through the size limitation of the aperture diaphragm to achieve detection sensitivity and maximum detection saturation The balance of light quantity realizes light quantity monitoring with high dynamic range.

In some embodiments, the light source detection device further includes a background light detector 8A, and the position of the background light detector 8A corresponds to the position of the second photosensor 82 .

Exemplarily, as shown in FIG. 5C , the background light detector 8A is set to eliminate the influence of background stray light on the measurement result of the second photosensor 82 . In the present application, a background light detector 8A is provided on one side of the second photosensor 82 , and the background light detector 8A can hardly receive the detection light beam transmitted by the light emitted by the B_LED through the first optical region R1 . By subtracting the detection signal of the second photoelectric sensor 82 and the background light signal detected by the background light detector 8A, a B light detection signal more consistent with the output B light is obtained, thereby achieving higher precision B light quantity control.

Further, in order not to increase the use of the background light detector 8A, the present application can use the first photoelectric sensor 81 as the background light detection photodetector, which basically cannot receive the B light detection beam, so as to achieve the purpose of simplifying the system.

Further, as shown in FIG. 5C , the present application is also provided with a background light detection photodetector 8B, and the background light detection photodetector 8B is located at the diameter of the UV light detection beam obtained by the approximately collimated beam C1 reflected by the second optical surface 31B. In other words, the background light detection photodetector 8B hardly receives the UV light reflected by the second optical surface 31B, and the detection signal of the first photoelectric sensor 81 and the background detected by the background light detection photodetector 8B The light signals are subtracted to obtain a UV light detection signal that is more consistent with the output UV light, so as to achieve higher-precision UV light quantity control; similarly, the third photoelectric sensor 83 and the fourth photoelectric sensor 84 can be set with corresponding background light detection A photodetector is used to eliminate the influence of background stray light and improve the detection accuracy, which will not be repeated here.

In some embodiments, the light source detection device further includes a filter, and the front ends of the first photosensor 81 , the second photosensor 82 , the third photosensor 83 and the fourth photosensor 84 are provided with filters.

In order to achieve stable illumination light tone and high-precision control of brightness, spectral filtering can be performed on the spectrum of the detection beam of one of the photosensors or more than one photosensors. Optionally, the present application performs spectral filtering on the spectra of the detected light beams of the first photosensor 81, the second photosensor 82, the third photosensor 83, and the fourth photosensor 84. Filters are arranged in the measurement optical paths of the photoelectric sensor 82, the third photoelectric sensor 83 and the fourth photoelectric sensor 84 to cut off the part that exceeds the spectral range of the output illumination light, so as to realize the integration with the first LED light-emitting element 11 and the second LED light-emitting element 12. , the third LED light-emitting element 13 and the fourth LED light-emitting element 14 output the measured spectra whose spectra B1 to B4 are identical or similar.

In this application, the first LED light-emitting element 11 , the second LED light-emitting element 12 , the third LED light-emitting element 11 , the second LED light-emitting element 12 , and the third LED light-emitting element 11 , the second LED light-emitting element 12 , and the third LED light-emitting element 11 , the second LED light-emitting element 12 , and the third LED light-emitting element 11 , the second LED light-emitting element 12 , and the third LED light-emitting element 11 , the second LED light-emitting element 12 , and the third LED light-emitting element 11 , the second LED light-emitting element 12 , and the third LED light-emitting element in the output light are detected and output by the light quantity of the first photoelectric sensor 81 , the second photoelectric sensor 82 , the third photoelectric sensor 83 , and the fourth photoelectric sensor 84 . The light-emitting element 13 and the fourth LED light-emitting element 14 have a strongly correlated correspondence between the component outputs to ensure the accuracy of light quantity detection, thereby maintaining the stability of illumination light tone and luminous flux, and simplifying the light quantity control strategy.

In the design, at least the front end of the third photoelectric sensor 83 is equipped with a band-pass filter L3 with transmission characteristics in the range of spectrum B3, which can effectively filter out the blue excitation light in the emission spectrum of the fluorescent G_LED, and keep the G_LED detection beam spectrum and The output spectrum B3 is similar or consistent; alternatively, a short-wave or band-pass filter L1 with transmission characteristics within the range of spectrum B1 is arranged at the front end of the first photoelectric sensor 81; The bandpass filter L2; the front end of the fourth photoelectric sensor 84 is configured with a long-wavelength or bandpass filter L4 with transmission characteristics within the range of the spectrum B4.

In some embodiments, the light source detection device further includes a plurality of collimating lenses, and the emitted light of each light source portion is irradiated on the corresponding dichroic mirror after passing through the corresponding collimating lens.

Exemplarily, as shown in FIG. 2 , the light source detection device has a first collimating lens 21 , a second collimating lens 22 , a third collimating lens 23 and a fourth collimating lens 24 ; The second collimating lens 22 , the third collimating lens 23 and the fourth collimating lens 24 respectively emit illumination to the first LED light-emitting element 11 , the second LED light-emitting element 12 , the third LED light-emitting element 13 and the fourth LED light-emitting element 14 The light is collimated to obtain approximately collimated beams C1 to C4, and then the first dichroic mirror 31, the second dichroic mirror 32 and the third dichroic mirror 33 transmit or reflect the corresponding approximately collimated beams C1 to C4. The optical path integration is completed, and the combined light beam C5 is obtained.

In some embodiments, the light source detection device further includes a focusing lens, and the focusing lens is arranged on the irradiation path of the output synthetic light. As shown in FIG. 2 , the focusing lens 4 converges the obtained light beam C5 to form a focused light beam A with a certain aperture angle β at the light outlet, and the focused light beam A is coupled into the corresponding light guide 5 .

In some embodiments, as shown in FIG. 1 , the light source detection device further includes a heat dissipation part 20, the position of the heat dissipation part 20 corresponds to the position of the light source part, and is used to dissipate heat from the light source part.

During use, since the related parameters of the first LED light-emitting element 11 , the second LED light-emitting element 12 , the third LED light-emitting element 13 and the fourth LED light-emitting element 14 are affected by the operating temperature, such as the amount and spectrum of light emitted, during the LED operation The heat generation causes the junction temperature (PN junction temperature) to rise, which on the one hand leads to the shift of the peak wavelength, and on the other hand, the luminous flux decreases with the rise of the junction temperature. The R_LED used in the fourth LED light-emitting element 14 is particularly obvious. The mirror light source device controls the heat dissipation of each LED light-emitting element to maintain the operating temperature within a reasonable range.

The heat dissipation part 20 can be combined to dissipate heat in various ways, such as using thermal conductive glue, heat conduction sheet, heat dissipation fins, water cooling or liquid cooling for each LED light-emitting element to conduct heat dissipation; further, the heat dissipation part 20 further includes: Each LED light emitting element or one or more fans in the external space is used for air cooling and fan heating for overall heat dissipation of each LED light emitting element, or/and other components (such as circuit control components) of the endoscope light source device.

The light source detection device in this application is not limited to detecting four LED light-emitting elements. As shown in FIG. 6 , the light source detection device includes a first LED light-emitting element 11, a second LED light-emitting element 12, a third LED light-emitting element 13, The fourth LED light-emitting element 14 and the fifth LED light-emitting element 15; Fig. 7A shows the spectral curves of each LED and the dichroic mirror; Fig. 7B, Fig. 7C, Fig. 7D and Fig. 7E correspondingly give the fourth dichroic The spectral graph of the mirror, the spectral graph of the third dichroic mirror, the spectral graph of the second dichroic mirror and the spectral graph of the first dichroic mirror; Figure 7F provides the second dichroic mirror in Figure 6. The spectral curves of the dichroic mirrors F2 and F2B; FIG. 8 corresponds to the detection device of FIG.

The device in FIG. 6 has an amber LED15 (A-LED) added to the aforementioned device, that is, the five LED light-emitting elements LED11-15 are respectively an ultraviolet LED11 (UV-LED), a blue LED12 (B-LED), a green LED13 ( G-LED), red LED14 (R-LED), amber LED15 (A-LED); wherein, amber LED15 (A-LED), preferably, its peak wavelength is 590-610nm, and hemoglobin is near 600nm. The absorption degree of LED14 (R_LED) varies greatly. The peak wavelength of LED14 (R_LED) is located at 620-640nm, which is smaller than the light absorption coefficient of 600nm wavelength, and the scattering coefficient of living tissue is also smaller. According to the narrow band near 600nm and 630nm of LED15 and LED16 The difference in light absorption and scattering characteristics is beneficial to improve the visibility of deep blood vessels. Other structures are the same as the above, and will not be repeated here. The second optical surface of the first dichroic mirror 31 is provided with a beam splitter film F1B; the beam splitter film F3B can reflect the light beam emitted by the second LED light-emitting element 12 while transmitting to obtain a B light detection beam. The detection beam enters the second photoelectric sensor 82 for detection.

Specifically, the wavelength of the transition region of the first optical surface of the first dichroic mirror 31A is in the range of 410-430 nm, and the transmittance of the ultraviolet light (≤420 nm) emitted by the UV_LED reaches the optimum transmittance according to the coating process T1, preferably, T1≥97%; at the same time, for the blue light (≥420nm) emitted by B_LED, it has spectroscopic characteristics with reflection characteristics as the main and transmission characteristics as the auxiliary, preferably, the first optical surface 31A has a wavelength above 430nm. The reflectivity R1 and transmittance T2 are designed through the beam splitter film, which has the transmission characteristics of B light less than or equal to 10%, and the reflection characteristics of B light greater than or equal to 90%. The F1B coating characteristics are highly transparent to the violet light emitted by UV_LED , the blue light emitted by B_LED is more than or equal to 90% of reflection and less than or equal to 10% of transmission, so that UV_LED emits light and B_LED photosynthetic light while achieving B_LED transmittance splitting, as the detection light enters the luminous flux measuring device PD82 to measure the output luminous flux of B_LED detection.

The emitted light of R_LED is sequentially reflected by the first optical surface 34A of the fourth dichroic mirror 34 , then reflected by the first optical surface 33A of the third dichroic mirror 33 , and then reflected by the second optical surface 32B of the second dichroic mirror 32 The R light detection beam is obtained, and enters the luminous flux measuring element PD84 as the detection light to detect the output luminous flux of the R_LED.

Among them, the optical path integration of G_LED is performed before the optical path integration of B_LED, as the first optical surface 32A of the dichroic mirror 32 that integrates the optical path of G_LED and the optical path of B_LED, realizes the cut-off of blue excitation light in the emitted light of G_LED, and has complete Cut off the characteristics of blue excitation light and completely reflected B_LED emission light in the reflected light of G_LED, that is, the reflectivity of blue light emitted by B_LED reaches the highest according to the coating process, and it has almost no spectral characteristics of transmitting blue light.

Since other inspection principles in the embodiments of the present application are the same as those described above, they are not repeated here.

As shown in FIG. 9 , the present application also provides a schematic diagram of a detection light path of a third optical device, which includes a first LED light-emitting element 11 , a second LED light-emitting element 12 , a third LED light-emitting element 13 , and a fourth LED light-emitting element 14 and the fifth LED light-emitting element 15 , wherein the first LED light-emitting element 11 , the second LED light-emitting element 12 , the third LED light-emitting element 13 , and the fourth LED light-emitting element 14 have been correspondingly described in the foregoing, and will not be repeated here. . The fifth LED light-emitting element 15 is an amber light source. FIG. 10 shows a spectral curve diagram of the first dichroic mirror 31 in this embodiment, and FIG. 11 shows a schematic diagram of an example of a change in the detection optical path of the optical device.

Specifically, the five-way light combining system including the first LED light-emitting element 11 , the second LED light-emitting element 12 , the third LED light-emitting element 13 , the fourth LED light-emitting element 14 and the fifth LED light-emitting element 15 corresponds to the ultraviolet (UV-LED), blue (B-LED), green (G-LED), red (R-LED) and amber (A-LED).

The optical path integration of the G_LED is performed after the optical path integration of the B_LED. Further, the light source unit performs optical path integration in sequence from short to long according to the emission wavelength, so that the first optical surface 31A, The first optical surface 32A of the second dichroic mirror 32 , the first optical surface 33A of the third dichroic mirror 33 , and the first optical surface 34A of the fourth dichroic mirror 34 have long-wave or short-pass characteristics: Features that simplify the coating process and reduce system costs.

Meanwhile, the characteristics of the first optical surface 33A of the second dichroic mirror 33 and the first optical surface 34A of the fourth dichroic mirror 34 are shown in FIGS. 3C and 3B ; The characteristics of the surface 32A are shown in Fig. 7C; the first optical surface 31A of the first dichroic mirror 31 has a long-wavelength characteristic with a wavelength of about 600-630nm in the transition region, the transmission R_LED is higher than 610nm and the reflection A-LED is lower than 610nm complete the optical path integration of the violet, blue, green and amber light emitted by UV_LED, B_LED, G_LED and A_LED and the red light emitted by R_LED;

The device realizes the stable color tone of the illumination light and the precise control of the output light quantity through the feedback control of the luminous flux of each LED. 81 to 85 have photoelectric sensors PD81 to 85.

Through the beam splitting characteristics of the second optical surfaces 31B, 33B, 34B of the dichroic mirrors 31, 33, 34, the emitted light parts of the R_LED, G_LED and UV_LED are split into beams and enter the luminous flux measuring element 84 corresponding to each LED , 83, 81; through the spectroscopic properties of the second optical zone R2 on the first optical surface 32A on the dichroic mirror 32, the A_LED emission light passes through the transmission beam splitting of the second optical zone R2 and enters with the luminous flux measuring element 85 By the light-splitting characteristic of the second optical zone R2 of the first optical surface 34A of the dichroic mirror 34, or the beam-splitting characteristic of the first optical surface 34A on the dichroic mirror 34, the B_LED emission light transmits the beam-splitting and enters with the luminous flux Measuring part 82; beam splitting characteristics of the second optical surfaces 31B, 33B, 34B of the dichroic mirrors 31, 33, 34, and partitioned coating characteristics or dichroic characteristics of the first optical surfaces 32A, 34A of the dichroic mirrors 32, 34 The color beam splitting characteristics are designed in the same way as the first to third embodiments, so that each LED can be integrated in the optical path and complete the spectral detection at the same time.

Preferably, the second optical regions R2 of the first optical surfaces 32A and 34A corresponding to the dichroic mirrors 32 and 34 are not coated, or have the same coating characteristics, that is to say, the A_LED emits amber light and B_LED emits blue light by about 95%. The beam splitter film F5 with % transmission and about 5% reflection, or the anti-reflection film F6 with anti-reflection characteristics, refer to the second coating process of Example 1, for the second optical surface of the first optical surfaces 32A and 34A of the dichroic mirrors 32 and 34 Zone R2 can be coated in the same batch, simplifying the coating process and reducing the system cost.

The luminous flux measuring parts 81 and 82 are offset to the luminous flux measuring part 82, and the photoelectric sensors PD81 and PD82 are arranged side by side in the detection light path space shown in FIG.

An example of the change of the detection optical path of the device is shown in Figure 11. Optionally, for the spectroscopic detection scheme of the B light emitted by the B_LED, the second optical surface 32B of the dichroic mirror 32 is set to have beam splitting characteristics, and the B_LED emits light. It is reflected by the first optical surfaces 34A and 33A of the dichroic mirrors 34 and 33 in turn, and enters the second optical surface 32B of the dichroic mirror 32 to perform light splitting to obtain B light detection and viewing. In reflection spectroscopic detection, the luminous flux measuring elements 82 and 85 offset the luminous flux measuring element 82, and the photoelectric sensors 82 and 85 are arranged side by side up and down or left and right in the detection optical path space of the second optical device shown in FIG. 10 .

Preferably, the amount of detected light received by the luminous flux measuring elements 81 to 85 accounts for a moderate proportion of the amount of light emitted by each LED. On the one hand, sufficient light is achieved to meet the monitoring accuracy of the system, and on the other hand, the amount of emitted light is not excessive to avoid excessive light The detected light quantity brings saturation of the photoelectric sensors 11-15, and can achieve the maximum dynamic detection range required by the system. While performing high-precision and high-dynamic range detection on the luminous flux of each LED, the effective output illumination light is not lost too much.

At the same time, the fluorescent G_LED emits green light and has blue excitation light. In order to prevent the blue excitation light of the G_LED from being transmitted into the effective illumination light path through the subdivision coating splitting or dichroic beam splitting characteristics of the dichroic mirror in the downstream optical path, The detection optical path meets the following conditions:

Realize G_LED as the first optical surface of the dichroic mirror integrating the optical path of G_LED and the optical path of B_LED, realize the cut-off of blue excitation light in the emission light of G_LED, and have complete cut-off of blue excitation light and complete reflection in the reflected light of G_LED The characteristics of the light emitted by the B_LED, that is, the reflectivity of the blue light emitted by the B_LED reaches the highest level according to the coating process, and hardly has the spectral characteristics of transmitting blue light.

The above constraints prevent the blue excitation light of G_LED and the blue light emitted by B_LED from being confused with each other in the output illumination light, so that the spectral curves of each light source part in the output illumination light are independent of each other, and there are as few or almost no overlapping bands as possible; The detection light path of the endoscope light source device 100 that uses other fluorescent LEDs to combine light has similar characteristics.

Under the premise of satisfying the above conditions and detection effects, the detection optical path has different combinations and variations according to the above-mentioned various detection schemes, and belongs to the scope of the present invention;

As shown in FIG. 1 , the endoscope system of the present application includes a light source detection device 100 , an endoscope 101 , an image processing unit 30 , a control unit 40 , an input unit 70 , and a display unit 80 , wherein the light source detection device 100 includes N Each of the light source parts and the light combining module 10, wherein the light source types of the light source parts 11-1N are LEDs or LDs, including fluorescent LEDs or LDs, such as fluorescent green LEDs or LDs, or other types of light sources.

The endoscope 101 includes a light guide portion 50 disposed therein, and the light guide portion is composed of a light guide 5; the endoscope 101 also includes an illumination lens 51 and a camera module 60 arranged at the front end, and the camera module 60 includes a camera objective lens and an image The sensor, for example, a photoelectric conversion device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) sensor; the endoscope 101 further includes connecting cables distributed in the endoscope 101 .

The light combining module 10 integrates the output light of each light source part 11-1N and outputs the combined light, and the combined light is coupled into the light guide part 50 inside the endoscope 101. The light guide 5 formed by the combined optical fibers is transmitted to the front-end illumination lens 51 through the light guide portion 50 for light beam diffusion, forming illumination light projected on the observation target.

The light source detection device 100 provides the illumination light required for the observation of the target (living tissue in the body cavity), the camera module 60 images the observation area (living tissue mucosa and blood vessels, etc.), and the light guide part 50 transmits the output light of the light source detection device 100 to the At the front end of the endoscope 101, the illumination light is diffused by the illumination lens 51 to provide sufficient illumination for the observation area; the image signal captured by the camera module 60 is transmitted to the image processing unit 30 through the connecting cable for signal processing, and then output to the display The section 80 performs image display.

The control part 40 adjusts the output luminous flux based on the driving current (or voltage) of each light source part 11-1N, or changes the luminous flux by adjusting the current pulse duty ratio PWM (Pulse Width Modulation); the control part 40 controls the light source detection device 100 and the camera module. The working state of the group 60, for example, controlling the output luminous flux ratio of each light source part 11-1N according to the preset luminous flux ratio; The unit 70 externally inputs an instruction to switch among various illumination light modes of ordinary white light, mixed light or special light.

Specifically, the control unit 40 realizes feedback control of the driving current (or voltage) of each LED light-emitting element through the measurement result of the luminous flux measuring element. First, the detection signal of each luminous flux measuring element is calibrated, and the driving current and detection signal of each light source part are established. and the corresponding relationship between the components of each LED light-emitting element of the output luminous flux. During calibration, change or increase the driving current of each LED light-emitting element point by point, test the detection signal and output luminous flux of each LED light-emitting element component of each luminous flux measuring element under the corresponding current, and obtain the driving current, detection signal and output luminous flux of each LED light-emitting element. The relationship curve of the three is calibrated, and then the calibration result is stored in the control unit 40 . Through the real-time signal detection of each luminous flux measuring element, combined with the calibration results, the feedback control of the output light quantity of each LED light-emitting element is accurately realized.

Through the control strategy of the control unit 40, the output luminous flux of each LED light-emitting element is output according to a preset ratio and kept constant, so as to obtain various observation modes suitable for the endoscope system. Basically, the general light observation mode M1 with white light illumination obtains the overall contour image of the living tissue; there is also a first special light observation mode M2 that is different from ordinary white light illumination, such as by setting the first LED light-emitting element that emits violet light or blue light 11 or the output luminous flux of the second LED light-emitting element 12 is the main illumination light component, and is used for the emphasis observation of superficial or superficial blood vessels according to the high absorption characteristics of blood in the blood vessels to violet light or blue light; or, it also has a mixed light observation mode M3, Different from ordinary light illumination and special light illumination, it has part of the spectrum of special light illumination, and has part of the spectrum of ordinary light illumination, and obtains a mixed spectral output different from the two, and realizes the image that takes into account the overall outline of the living tissue and the emphasized observation of blood vessels; It also has a second special light observation mode M4 for performing bleeding point observation, by setting the third LED light-emitting element 13, the fifth LED light-emitting element 15 and the fourth LED light-emitting element 14 that emit green, amber and red to work simultaneously, The position of the bleeding point is displayed on the observation image.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but should not be construed as a limitation on the scope of the patent application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the appended claims.

Claims (17)

1. A light source detection device, characterized in that, comprising: at least two light source parts, each of which is used for outputting emitted light; At least one dichroic mirror, the dichroic mirror has a first optical surface and a second optical surface, after each of the light source parts emits light, the first optical surface is used to send the corresponding emitted light to the optical path After integration, synthetic light is output, and the second optical surface is used for light quantity detection after splitting the emitted light. 2 . The light source detection device according to claim 1 , wherein the light source detection device further comprises at least one luminous flux measuring element for detecting the emitted light, and the position of the luminous flux measuring element is the same as that of the light source part to be detected. 3 . corresponding to the location; The second optical surface can enter the reflected light obtained by splitting the emitted light of the corresponding light source part into the luminous flux measuring element as detection light. 3 . The light source detection device according to claim 2 , wherein the first optical surface on the dichroic mirror can only output synthesized light after optical path integration, or The first optical surface on at least one of the dichroic mirrors can transmit light to detect the light quantity. 4. The light source detection device according to claim 3, wherein a first optical zone and a second optical zone are provided on the first optical surface of at least one of the dichroic mirrors, and the first optical zone is the area of the first optical surface is greater than or equal to 90%, and the second optical zone occupies less than or equal to 10% of the area of the first optical surface; The second optical zone is used to transmit the emitted light of the corresponding light source part, so that the emitted light enters the corresponding luminous flux measuring element. 5 . The light source detection device according to claim 4 , wherein a dichroic filter film is provided on the first optical zone; 6 . A beam splitting film is arranged on the second optical zone, or an anti-reflection film is arranged on the second optical zone. 6 . The light source detection device according to claim 4 , wherein the photosensitive surface transmitted to the corresponding luminous flux measuring member through the second optical zone faces the dichroic mirror transmitted through the second optical zone. 7 . Detects the direction of the optical axis. 7 . The light source detection device according to claim 6 , wherein the size of the light beam transmitted to the corresponding luminous flux measuring element through the second optical zone is larger than the size of the photosensitive surface. 8 . 8 . The light source detection device according to claim 2 , wherein a dichroic mirror reflected by the second optical surface to the corresponding photosensitive surface of the luminous flux measuring member and reflected by the second optical surface The direction of the detection optical axis is set vertically. 9 . The light source detection device according to claim 8 , wherein the size of the photosensitive surface reflected by the second optical surface to the corresponding luminous flux measuring member is smaller than the light beam corresponding to the detection light on the light source part. 10 . size. 10 . The light source detection device according to claim 3 , wherein a beam splitting film F3B is provided on the first optical surface of one of the dichroic mirrors; the beam splitting film F3B can separate the corresponding light source part. 11 . The emitted light is reflected and transmitted at the same time, so that the transmitted light enters the corresponding luminous flux measuring element. 11 . The light source detection device according to claim 3 , wherein a dichroic filter film is provided on the first optical surface of the dichroic mirror. 12 . 12 . The light source detection device according to claim 2 , wherein the light source detection device further comprises a background light detector, and the background light detector is located in the area covered by the corresponding detection beam on the corresponding luminous flux measuring element. 13 . outside the scope. 13 . The light source detection device according to claim 2 , wherein the light source detection device further comprises an aperture diaphragm, and the front end of at least one of the luminous flux measuring elements is provided with the aperture diaphragm. 14 . 14 . The light source detection device according to claim 2 , wherein the light source detection device further comprises an optical filter, and the front end of at least one of the luminous flux measuring elements is provided with the optical filter. 15 . 15. The light source detection device according to claim 1, wherein there are multiple dichroic mirrors; The second optical surfaces of the plurality of dichroic mirrors are respectively provided with beam splitting films, the beam splitting films are used for splitting the emitted light of the corresponding light source parts, and each beam splitting film is used for different wavelengths of the beam splitting The emitted light; the beam splitting wavelength range of the beam splitting film is determined by the wavelength of the emitted light. 16. The light source detection device according to claim 1, wherein there are multiple dichroic mirrors; The second optical surfaces of the plurality of dichroic mirrors are provided with the same beam splitting film; the same beam splitting film is used to split the emitted light reflected by the second optical surface, and the wavelength of the emitted light reflected by the second optical surface is different. At the same time, the beam splitting wavelength range of the same beam splitting film can cover the wavelength range of the emitted light with different wavelength bands. 17 . The light source detection device according to claim 15 , wherein the beam splitting film can reflect 10% or less of the light beam and can transmit 90% or more of the light beam. 18 .

Images