Light source detection device

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; and at least one dichroic mirror, which has a first optical surface and a second optical surface, wherein the first optical surface is used for outputting combined light after the corresponding emitted light is integrated in an optical path, and the second optical surface is used for detecting the light quantity after the emitted light is split. The above scheme provided by the application realizes light combination of the multiple light source parts through the first optical surface of the dichroic mirror, and realizes light quantity detection after the emitted light is split through the second optical surface of the dichroic mirror. The device can realize split detection without adding additional optical elements, and effectively simplifies system design.

Description

Technical Field

[0001] This invention relates to the field of endoscopy technology, and in particular to a light source detection device. Background Technology

[0002] In the medical field, endoscopy has become a widely used diagnostic method. A medical endoscope has an insertion part that is inserted into the human body. Illumination is provided by a light source device that is transmitted into the human body through a beam guide. The endoscope is captured by a camera module at the front end of the insertion part, and the image is processed by a corresponding image processor. Finally, the image is output to a display.

[0003] As illumination devices providing light for in vivo observation, solid-state light-emitting elements such as LEDs (Light Emitting Diodes) or LDs (Laser Diodes) are increasingly replacing traditional xenon and halogen lamps in practical applications due to their advantages such as low power consumption and long lifespan. In endoscopic diagnosis, white light observation mode is commonly used to observe the overall shape of the surface of living tissue. In addition, various special light observation modes have been developed to enhance the observation of blood vessels at different depths, thereby improving the screening of lesions. This requires illumination devices to provide illumination modes with different spectral forms, such as using LEDs as light sources, combining multiple LEDs, or using filters to achieve the aforementioned white light or special light illumination output.

[0004] The endoscope's camera module captures images for observation, which are then processed by the image processing unit to generate static or dynamic images. Doctors use these images to diagnose lesions. Since the spectral state of the illumination light output by the lighting device affects the hue of the generated image, significantly impacting lesion observation, maintaining a stable spectrum or hue of the illumination light output is crucial. For light sources composed of LEDs as light-emitting elements, changes in the LED's own temperature affect the amount of light emitted. Furthermore, temperature variations can cause a certain degree of wavelength shift in the LED, leading to a lack of constant illumination intensity and / or spectrum. Over time, excessively high LED temperatures (junction temperatures) during operation can cause a certain degree of attenuation in light output.

[0005] To facilitate the detection of LED light output, the existing patent with application number CN201380001706.3 uses an illuminance sensor configured on the side of the optical path to receive leakage light from each LED that is not used as illumination light or / and light reflected by optical elements in the illumination optical path, in order to monitor the light output of the light-emitting element; the patents with application numbers CN201410524810.7 and CN201811007363.2 both use a beam splitter and a photodetector for spectral detection; the patent with application number CN209564106U does not use an additional beam splitter for light output monitoring, but collects parallel light leakage from the first and second light-emitting elements that is not used for illumination.

[0006] However, the illuminance sensor in the patent application CN201380001706.3 receives relatively weak light, thus it cannot perform efficient light monitoring; the applications CN201410524810.7 and CN201811007363.2 add additional beam-splitting elements (beam-splitting mirrors), which also increases the system complexity; the light intensity detected by application CN209564106U is only collected from system leakage light, which may result in weak light intensity and low detection accuracy, and it cannot perform real-time light monitoring.

[0007] Therefore, how to achieve high-precision, high-dynamic-range real-time light intensity monitoring without adding additional optical components has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] The purpose of this invention is to provide a light source detection device that enables high-precision, high-dynamic-range real-time light quantity monitoring without the addition of additional optical components.

[0009] This application provides a light source detection device, including:

[0010] At least two light source units, each of which is used to output emitted light;

[0011] At least one dichroic mirror has a first optical surface and a second optical surface. After each of the light sources emits light, the first optical surface is used to integrate the corresponding emitted light into a composite light, and the second optical surface is used to split the emitted light and detect the amount of light.

[0012] In one embodiment, the light source detection device further includes at least one luminous flux measuring element for detecting emitted light, the position of which corresponds to the position of the light source to be detected;

[0013] The second optical surface can split the emitted light from the corresponding light source and reflect the reflected light as the detection light into the light flux measuring device.

[0014] In one embodiment, the first optical surface on the dichroic mirror can only output synthesized light after optical path integration, or

[0015] At least one of the first optical surfaces on the dichroic mirror is capable of transmitting light for light quantity detection.

[0016] In one embodiment, at least one of the dichroic mirrors has a first optical region and a second optical region disposed on a first optical surface, wherein the first optical region occupies an area of ​​greater than or equal to 90% of the first optical surface, and the second optical region occupies an area of ​​less than or equal to 10% of the first optical surface.

[0017] The second optical area is used to transmit the emitted light from the corresponding light source so that the emitted light enters the corresponding luminous flux measuring device.

[0018] In one embodiment, a dichroic filter film is disposed on the first optical region; a beam splitter film is disposed on the second optical region, or an antireflection film is disposed on the second optical region.

[0019] In one embodiment, the photosensitive surface of the corresponding luminous flux measuring device transmitted through the second optical region is aligned with the detection optical axis of the dichroic mirror transmitted through the second optical region.

[0020] In one embodiment, the size of the light beam transmitted through the second optical region to the corresponding light flux measuring element is larger than the size of the photosensitive surface.

[0021] In one embodiment, the photosensitive surface of the corresponding luminous flux measuring element, which is reflected by the second optical surface, is perpendicular to the direction of the detection optical axis of the dichroic mirror reflected by the second optical surface.

[0022] In one embodiment, the photosensitive surface size of the corresponding light flux measuring element reflected by the second optical surface is smaller than the beam size of the detection light on the corresponding light source.

[0023] In one embodiment, a beam splitter F3B is provided on the first optical surface of one of the dichroic mirrors; the beam splitter F3B can reflect and transmit the emitted light from the corresponding light source, so that the transmitted light enters the corresponding luminous flux measuring device.

[0024] In one embodiment, a dichroic filter film is disposed on the first optical surface of the dichroic mirror.

[0025] In one embodiment, the light source detection device further includes a background light detector located outside the range covered by the corresponding detection beam on the corresponding luminous flux measuring device.

[0026] In one embodiment, the light source detection device further includes an aperture stop, and the aperture stop is disposed at the front end of at least one of the luminous flux measuring devices.

[0027] In one embodiment, the light source detection device further includes a filter, and the filter is disposed at the front end of at least one of the luminous flux measuring devices.

[0028] In one embodiment, there are multiple dichroic mirrors; each of the multiple dichroic mirrors has a beam-splitting film disposed on its second optical surface. The beam-splitting film is used to split the emitted light from the corresponding light source, and 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.

[0029] In one embodiment, there are multiple dichroic mirrors; the same beam-splitting film is disposed on the second optical surface of the multiple dichroic mirrors; the same beam-splitting film is used to split the emitted light reflected by the second optical surface, and when the emitted light reflected by the second optical surface has different wavelength bands, the beam-splitting wavelength range of the same beam-splitting film can cover the wavelength range of the emitted light with different wavelength bands.

[0030] In one embodiment, the beam splitter is capable of reflecting less than or equal to 10% of the light beam and enabling greater than or equal to 90% of the light beam to be transmitted.

[0031] The beneficial effects of this application include:

[0032] The light source detection device provided in this application combines light from multiple light sources through the upper first optical surface of a dichroic mirror and detects the amount of light after beam splitting through the upper second optical surface of the dichroic mirror. This device can achieve beam splitting detection without adding additional optical components, which effectively simplifies the system design. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of an endoscope system structure provided in an embodiment of this application;

[0034] Figure 2 A schematic diagram of a first optical device provided in an embodiment of this application;

[0035] Figure 3A for Figure 2 Spectral curves of each LED and dichroic mirror in the diagram;

[0036] Figure 3B for Figure 2The spectrum curve of the third dichroic mirror F3 in the diagram;

[0037] Figure 3C for Figure 2 The spectrum curve of the second dichroic mirror F2 in the diagram;

[0038] Figure 3D for Figure 2 The spectrum curve of the first dichroic mirror F1 in the diagram;

[0039] Figure 3E Spectral curves of the third dichroic mirrors F3 and F3B in a first optical device provided in an embodiment of this application;

[0040] Figure 4 This is a schematic diagram of the detection optical path of a first optical device provided in an embodiment of this application;

[0041] Figure 5A for Figure 4 Schematic diagram of the coating on surface 33A of the third dichroic mirror.

[0042] Figure 5B for Figure 4 A schematic diagram showing the positional structure of the first and second photoelectric sensors in the diagram;

[0043] Figure 5C This is a schematic diagram of the positional structure of the background light detector relative to the first and second photoelectric sensors provided in an embodiment of this application;

[0044] Figure 6 This is a schematic diagram of the detection optical path of the second optical device provided in an embodiment of this application;

[0045] Figure 7A for Figure 6 Spectral curves of each LED and dichroic mirror in the diagram;

[0046] Figure 7B for Figure 6 Spectral curve of the fourth dichroic mirror in the middle;

[0047] Figure 7C for Figure 6 Spectral curve of the third dichroic mirror in the middle;

[0048] Figure 7D for Figure 6 Spectral curve of the second dichroic mirror in the middle;

[0049] Figure 7E for Figure 6 Spectral curve of the first dichroic mirror in the middle;

[0050] Figure 7F Spectral curves of the second dichroic mirror F2 and F2B in a second optical device provided in an embodiment of this application;

[0051] Figure 8 This is a schematic diagram of the detection optical path of the second optical device provided in an embodiment of this application;

[0052] Figure 9 This is a schematic diagram of the detection optical path of a third optical device provided in an embodiment of this application;

[0053] Figure 10 for Figure 9 Spectral curve of the first dichroic mirror in the middle;

[0054] Figure 11 This is a schematic diagram illustrating an example of a third optical device for detecting changes in the optical path, provided in an embodiment of this application.

[0055] The markings in the image are as follows:

[0056] 11. First LED light-emitting element; 12. Second LED light-emitting element; 13. Third LED light-emitting element; 14. Fourth LED light-emitting element; 15. Fifth LED light-emitting element; 21. First collimating lens; 22. Second collimating lens; 23. Third collimating lens; 24. Fourth collimating lens; 25. Fifth collimating lens; 31. First dichroic mirror; 32. Second dichroic mirror; 33. Third dichroic mirror; 34. Fourth dichroic mirror; 4. Focusing lens; 5. Beam guide; 81. First photoelectric sensor; 82. Second photoelectric sensor; 83. Third photoelectric sensor; 84. Fourth photoelectric sensor; 85. Fifth photoelectric sensor; 100. Light source detection device; 101. Endoscope; 10. Light combining module; 20. Heat dissipation unit; 30. Image processing unit; 40. Control unit; 50. Light guide unit; 51. Illumination lens; 60. Camera module; 70. Input unit; 80. Display unit. Detailed Implementation

[0057] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0058] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0061] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0063] In one embodiment of this application, a light source detection device is provided, comprising: at least two light source units and at least one dichroic mirror, wherein each light source unit is used to output emitted light, and the dichroic mirror has a first optical surface and a second optical surface. After each light source unit emits light, the first optical surface is used to integrate the corresponding emitted light into a composite light, and the second optical surface is used to split the emitted light beam and detect the light intensity.

[0064] The light source detection device in this application is used for detecting the light source part in an endoscope. Hereinafter, the light source part of the endoscope will be used as an example for explanation.

[0065] By adopting the above technical solution, multiple light sources are combined through the upper first optical surface of the dichroic mirror, and the emitted light is split and the light quantity is detected through the upper second optical surface of the dichroic mirror. This device can achieve beam splitting and detection without adding additional optical components, which effectively simplifies the system design.

[0066] In some embodiments, in order to detect the emitted light after beam splitting, 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 corresponding to the position of the light source to be detected; at the same time, the second optical surface can take the reflected light obtained by splitting the emitted light of the corresponding light source and enter it into the luminous flux measuring element as the detection light.

[0067] For example, such as Figure 4 As shown, the luminous flux measuring device in this application includes a first photoelectric sensor 81, a third photoelectric sensor 83, and a fourth photoelectric sensor 84; the light source includes a first LED light-emitting element 11, a third LED light-emitting element 13, and a fourth LED light-emitting element 14; and the dichroic mirrors are a first dichroic mirror 31, a second dichroic mirror 32, and a third dichroic mirror 33.

[0068] like Figure 4 and combined Figure 2As shown, the emitted light from 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 emitted light from the third LED light-emitting element 13 is split by the second optical surface 32B on the second dichroic mirror 32 and then enters the third photoelectric sensor 83; the emitted light from the fourth LED light-emitting element 14 is split by the second optical surface 31B on the first dichroic mirror 31 and then enters the fourth photoelectric sensor 84. Since the technical principle of measuring luminous flux using a photoelectric sensor is existing technology, it will not be elaborated here.

[0069] Furthermore, the luminous flux measuring devices in this application correspond one-to-one with the light source units, thereby enabling the detection of light quantity for each light source unit. It should be noted that the number of luminous flux measuring devices can be selected according to the actual product requirements, and is not limited here.

[0070] In some embodiments, the first optical surface of the dichroic mirror can only output synthesized light after optical path integration, or at least one of the first optical surfaces of the dichroic mirror can transmit light for light quantity detection. In practical applications, a small amount of light leakage still exists when the first optical surface of the dichroic mirror is integrated into the optical path. This application mainly describes the spectral characteristics of the first optical surface of the dichroic mirror.

[0071] For example, such as Figure 2 and combined Figure 4 As shown, the light source unit 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 light source detection device includes a first dichroic mirror 31, a second dichroic mirror 32, and a third dichroic mirror 33; the luminous flux measuring device includes a first photoelectric sensor 81, a second photoelectric sensor 82, a third photoelectric sensor 83, and a fourth photoelectric sensor 84. It can be understood that the luminous flux measuring devices 81 to 84 have photoelectric sensors PD (Photo Diode). In other embodiments, other types of photoelectric detection elements may also be used.

[0072] Among them, the first LED light-emitting element 11 is a UV_LED that emits UV light in the purple to blue region, the second LED light-emitting element 12 is a B_LED that emits B light in the blue region, the third LED light-emitting element 13 is a G_LED that emits G light in the green region, and the fourth LED light-emitting element 14 is an R_LED that emits R light in the red region.

[0073] Meanwhile, the UV LED, based on the strong absorption characteristic of hemoglobin in the 405-415nm wavelength range, preferably has a peak wavelength of 405-415nm, and its wavelength range is preferably narrow-band with a bandwidth of about 20nm. Due to its high scattering and strong absorption characteristics, it is used to depict the morphology of blood vessels near the surface or superficial layers. The B LED, preferably has a peak wavelength of 430-460nm, and further preferably 430-450nm, distinguishes between superficial blood vessels and mucous membranes in the observed image by the difference in reflectivity. Its wavelength range is preferably narrow-band with a bandwidth of about 20nm. The G LED, preferably has a peak wavelength of 530-560nm, and its bandwidth can be selected as broadband, such as a bandwidth of about 100nm. The G LED is a fluorescent LED. The R LED, preferably has a peak wavelength of 600-640nm, and its wavelength range is preferably narrow-band with a bandwidth of about 20nm.

[0074] Specifically, the third LED light-emitting element 13 is a fluorescent G-LED that emits green light by exciting a phosphor with a blue LED. The blue LED has a blue excitation light with a peak wavelength in the range of 410 to 440 nm. The blue excitation light excites the fluorescent material to produce green light. A small amount of blue excitation light is not absorbed by the fluorescent material and is directly transmitted. Therefore, the emission spectrum of the third LED light-emitting element 13 includes not only the green band spectrum but also a small amount of blue excitation light. Compared with LEDs that emit green light themselves, fluorescent green LEDs are more likely to achieve high output light power.

[0075] In use, the first optical surface 32A on the second dichroic mirror 32 cuts off and filters the short-wavelength blue laser light in the G_LED emission light, preventing the blue excitation light from entering the subsequent optical path. The spectral bands of the G_LED and B_LED components in the output illumination light almost do not overlap. By independently adjusting the proportion of each color spectral component, the control strategy of spectrum and luminous flux is simplified, and high-precision control of illumination color tone and luminous flux stability is achieved.

[0076] 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 as follows: Figure 3A As shown, spectrum L1 corresponds to the UV_LED ultraviolet light spectrum, spectrum L2 corresponds to the 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 the R_LED red light spectrum.

[0077] like Figure 3B and combined Figure 2As shown, the first optical surface 33A on the third dichroic mirror 33 has a short-wavelength pass characteristic F3 with a transition region wavelength of about 410-430nm, which is used to transmit UV_LED light below 420nm and reflect B_LED light above 420nm, thus completing the optical path integration of the violet light emitted by the UV_LED and the blue light emitted by the B_LED.

[0078] like Figure 3C and combined Figure 2 As shown, the first optical surface 32A on the second dichroic mirror 32 has a long-wavelength pass characteristic F2 with a transition region wavelength of about 460-480nm. It is used to reflect light from UV_LED and B_LED below 470nm and transmit light from G_LED above 470nm, thus completing the optical path integration of the violet light emitted by UV_LED, the blue light emitted by B_LED and the green light emitted by G_LED.

[0079] like Figure 3D and combined Figure 2 As shown, the first optical surface 31A on the first dichroic mirror 31 has a long-wavelength pass characteristic F1 with a transition region wavelength of about 590-610nm. It is used to reflect light from UV_LED, B_LED and G_LED below 600nm and transmit light from R_LED above 600nm. After integrating the optical paths 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 composite light is output.

[0080] In this application, the UV_LED is spectrally separated from the B_LED by the long-wavelength cutoff of the first optical surface 33A on the third dichroic mirror 33, achieving an independent spectrum B1 (≤420nm); the B_LED is spectrally separated by the short-wavelength cutoff of the first optical surface 33A on the third dichroic mirror 33 and the long-wavelength cutoff of the first optical surface 32A on the second dichroic mirror 32, achieving an independent spectrum B2 (420~470nm); the G_LED is spectrally separated by the short-wavelength cutoff of the first optical surface 32A on the second dichroic mirror 32 and the long-wavelength cutoff of the first optical surface 31A on the first dichroic mirror 32, achieving an independent spectrum B3 (470~600nm); and the R_LED is spectrally separated by the short-wavelength cutoff (600nm) of the first optical surface 31A on the third dichroic mirror, achieving an independent spectrum B4 (≥600nm). In this application, the short-wavelength cutoff and long-wavelength cutoff are relative to specific emission wavelengths, referring to the short-wavelength and long-wavelength ends of each LED's emission wavelength.

[0081] The first dichroic mirror 31, the second dichroic mirror 32, and the third dichroic mirror 33 in this application, while integrating the optical paths of the violet light emitted by the UV-LED, the blue light emitted by the B-LED, the green light emitted by the G-LED, and the red light emitted by the R-LED to output composite light, can also achieve independent spectral curves B1 to B4 for the UV-LED, B-LED, G-LED, and R-LED components, such as... Figure 3A As shown, the UV_LED, B_LED, G_LED and R_LED component spectral bands in the output illumination light of this application hardly overlap. By independently adjusting the proportion of each color spectral component, the control strategy of spectrum and luminous flux is simplified, and high-precision control of illumination color tone and luminous flux stability is achieved.

[0082] This device, while outputting synthesized light, such as Figure 4 and combined Figure 2 As shown, the emitted light from 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 emitted light from the third LED light-emitting element 13 is split by the second optical surface 32B on the second dichroic mirror 32 and then enters the third photoelectric sensor 83; the emitted light from the fourth LED light-emitting element 14 is split by the second optical surface 31B on the first dichroic mirror 31 and then enters the fourth photoelectric sensor 84. Since the technical principle of measuring luminous flux using a photoelectric sensor is existing technology, it will not be elaborated here.

[0083] Meanwhile, the emitted light from 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 emitted light from the second LED light-emitting element 12 can be detected.

[0084] Furthermore, the emitted light of the third LED light-emitting element 13 in this embodiment can also be transmitted through the first optical surface 32A on the second dichroic mirror 32, and then transmitted through the first optical surface 31A on the first dichroic mirror 31 to obtain a detection beam, which enters the corresponding photoelectric sensor 83 for measurement.

[0085] This application achieves beam combining of multiple light sources and beam splitting detection of the emission amount of each light source by designing the different optical characteristics of the first and second optical surfaces of a dichroic mirror. The detection beam is obtained without adding additional optical components (such as a beam splitter or other beam splitting optical components), and beam splitting detection is achieved. The detection beam is a small amount of reflected and transmitted light through the first or second optical surface of the dichroic mirror, which has a simplified system design and feedback control strategy.

[0086] In some embodiments, a first optical region R1 and a second optical region R2 are provided on the first optical surface of at least one dichroic mirror. The first optical region R1 occupies more than or equal to 90% of the area of ​​the first optical surface, and the second optical region R2 occupies less than or equal to 10% of the area of ​​the first optical surface. The second optical region R2 is used to transmit the emitted light from the corresponding light source so that the emitted light enters the corresponding luminous flux measuring device.

[0087] For example, to facilitate the detection of the luminous flux in the second LED light-emitting element 12, i.e., B_LED, the first optical surface 33A of the third dichroic mirror 33 has a partitioned coating characteristic, specifically, as shown in... Figure 5A As shown in the left and right figures, this application provides a first optical region R1 and a second optical region R2 on the first optical surface 33A of the third dichroic mirror 33. The first optical region R1 and the second optical region R2 have different coating characteristics. The first optical region R1 occupies more than or equal to 90% of the area of ​​the first optical surface, and the second optical region R2 occupies less than or equal to 10% of the area of ​​the first optical surface.

[0088] The first optical region R1 is used to transmit light beams with wavelengths below 420nm from the first LED light-emitting element 11 and reflect light beams with wavelengths greater than 420nm from the second LED light-emitting element 12 to form composite light; the second optical region R2 is used to transmit the emitted light from the second LED light-emitting element 12 so that the emitted light enters the second photoelectric sensor 82.

[0089] In use, the first optical region R1 has a dichroic filter film F3, the second optical region R2 is not coated, or the second optical region R2 is provided with a beam splitting film F5 that mainly transmits the blue light emitted by the B-LED, or the second optical region R2 is provided with an anti-reflection film F6 with anti-reflection properties, so that the light emitted by the B-LED is transmissively split into the corresponding second photoelectric sensor 82 through the second optical region R2.

[0090] Furthermore, such as Figure 5A As shown, the second optical region R2 in this application can be square or circular. The design of the size and shape of the second optical region R2 should match the size of the photosensitive surface of the second photoelectric sensor 82. That is, the transmitted beam of the B-LED emitted light through the second optical region R2 is used as the detection light to enter the photosensitive surface of the second photoelectric sensor 82, and the size of the detection light is greater than or approximately equal to the size of the photosensitive surface of the second photoelectric sensor 82.

[0091] In this application, when the second optical region R2 is not coated, based on the Fresnel reflection characteristics of the optical material, if BK7 optical glass is used as the substrate material of the third dichroic mirror 33, then region R2 has a transmittance of nearly 90%, which can achieve transmissive spectral dispersion of B-LED emitted light, and has the characteristics of simplifying the process.

[0092] In some embodiments, the photosensitive surface of the corresponding luminous flux measuring device transmitted through the second optical region R2 is aligned with the detection optical axis of the dichroic mirror transmitted through the second optical region.

[0093] For example, such as Figure 4 and combined Figure 5A As shown, the direction of the light transmitted from the second optical region R2 to the photosensitive surface of the second photoelectric sensor 82 is directly opposite to the direction of the optical axis (detection optical axis) of the detection beam transmitted from the second optical region R2 of the second LED light-emitting element 12 through the dichroic mirror 33. At the same time, the detection beam emitted by the second LED light-emitting element 12, after being transmitted through the second optical region R2 of the first optical surface 33A on the third dichroic mirror 33, directly illuminates the photosensitive surface of the second photoelectric sensor 82, thereby enabling the second photoelectric sensor 82 to optimally receive the corresponding detection light.

[0094] In some embodiments, the size of the light beam transmitted through the second optical region R2 to the corresponding light flux measuring element 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 on the second photoelectric sensor 82.

[0095] For example, such as Figure 4 and combined Figure 5A As shown, the beam size of the light emitted by the second LED light-emitting element 12, i.e., the B_LED, transmitted through the second optical area R2 to the second photoelectric sensor 82 is larger than the size of the photosensitive surface of the second photoelectric sensor 82. Therefore, the detection light incident on the second photoelectric sensor 82 by the B_LED has a certain margin to cover the photosensitive surface of the second photoelectric sensor 82, thereby making the second photoelectric sensor 82 insensitive to the installation position, ensuring system reliability, and controlling production costs.

[0096] In some embodiments, the photosensitive surface of the corresponding luminous flux measuring element reflected by the second optical surface is perpendicular to the direction of the detection optical axis of the dichroic mirror reflected by the second optical surface.

[0097] For example, such as Figure 4 As shown, the vertical light reflected by the second optical surface 32B on the third dichroic mirror 33 from the first LED light-emitting element 11 is the direction of the detection optical axis. The vertical light reflected by the second optical surface 32B on the third dichroic mirror 33 is perpendicular to the photosensitive surface of the corresponding first photoelectric sensor 81. The photosensitive surface on the third photoelectric sensor 83 is perpendicular to the detection optical axis reflected by the second optical surface 32B on the corresponding second dichroic mirror 32. The photosensitive surface on the fourth photoelectric sensor 84 is perpendicular to the detection optical axis reflected by the second optical surface 31B on the corresponding first dichroic mirror 31.

[0098] In this application, since the photosensitive surfaces of the first photoelectric sensor 81, the third photoelectric sensor 83, and the fourth photoelectric sensor 84 are perpendicular to the detection light axes reflected by 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, the first photoelectric sensor 81, the third photoelectric sensor 83, and the fourth photoelectric sensor 84 can optimally receive the corresponding detection light.

[0099] In some embodiments, the photosensitive surface size 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.

[0100] For example, the photosensitive surface size on the first photoelectric sensor 81 is much smaller than the beam size of the light detected on the first LED light-emitting element 11, the photosensitive surface size on the third photoelectric sensor 83 is much smaller than the beam size of the light detected on the third LED light-emitting element 13, and the photosensitive surface size on the fourth photoelectric sensor 84 is much smaller than the beam size of the light detected on the fourth LED light-emitting element 14.

[0101] 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 their corresponding second optical surfaces is much larger than the size of the photosensitive surfaces on the corresponding first photoelectric sensor 81, the second photoelectric sensor 82, the third photoelectric sensor 83, and the fourth photoelectric sensor 84. This makes the light flux measurement device insensitive to the installation position, improves the reliability of the overall device, and reduces production costs.

[0102] To avoid spatial interference between the first photoelectric sensor 81 and the second photoelectric sensor 82, such as Figure 5B As shown, in the design, the first photoelectric sensor 81, used to receive light reflected from the second optical surface, is spatially offset to avoid the space occupied by the second photoelectric sensor 82, used to receive light transmitted from the first optical surface. For example, the first photoelectric sensor 81 and the second photoelectric sensor 82 are offset vertically or horizontally in the detection optical path space. See... Figure 5B As shown in the figure, the diameter of the circle is the beam diameter of the detection optical axis. The detection beam is the beam of the approximately collimated beam C1 to C4 after reflection 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, either vertically or horizontally, to optimally receive the detection light from the first LED light-emitting element 11 and the second LED light-emitting element 12. Even after the first photoelectric sensor 81 is offset, the detection beam of the second LED light-emitting element 12 still completely covers the photosensitive surface on the second photoelectric sensor 82. At this time, the received luminous flux is not less than 90% of the original luminous flux.

[0103] In some embodiments, there are multiple dichroic mirrors; each of the multiple dichroic mirrors has a beam-splitting film disposed on its second optical surface. The beam-splitting film is used to split the emitted light from the corresponding light source, and 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.

[0104] 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 in this application all have beam-splitting characteristics. Through beam splitting characteristics with reflection characteristics as a secondary feature and transmission characteristics as the primary feature, that is, reflecting a small amount of light and transmitting most of the light, reflective beam splitting is achieved. When the reflective beam splitting illuminates the corresponding photoelectric sensor, the corresponding LED luminous flux can be detected.

[0105] Specifically, the second optical surface 33B of the third dichroic mirror 33 in this application has a third dichroic film FT3, which has a low reflection characteristic of less than or equal to 10% and a high transmission characteristic of greater than or equal to 90% for the violet light emitted by the UV-LED; the second optical surface 32B of the second dichroic mirror 32 has a second dichroic film FT2, which has a low reflection characteristic of less than or equal to 10% and a high transmission characteristic of greater than or equal to 90% for the green light emitted by the G-LED; the second optical surface 31B of the first dichroic mirror 31 has a third dichroic film FT1, which has a low reflection characteristic of less than or equal to 10% and a high transmission characteristic of greater than or equal to 90% for the red light emitted by the R-LED.

[0106] In use, less than or equal to 10% of the violet light emitted by the first LED light-emitting element 11 (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 sensor 81; less than or equal to 10% of the green light emitted by the third LED light-emitting element 13 (G_LED) is reflected by the second optical surface 32B on the second dichroic mirror 32, and part of the reflected light enters the corresponding third photoelectric sensor 83; less than or equal to 10% of the red light emitted by the fourth LED light-emitting element 14 (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 fourth photoelectric sensor 84, thereby enabling the detection of the luminous flux of UV_LED, G_LED, and R_LED.

[0107] 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 can reflect less than or equal to 10% of the light, or less than or equal to 5% of the light. Based on the photosensitive characteristics of the photoelectric sensors 81-84, the device can ensure that the detected light is kept at an appropriate level without sacrificing too much effective illumination light.

[0108] In some embodiments, there are multiple dichroic mirrors; the same beam-splitting film is disposed on the second optical surface of the multiple dichroic mirrors; the same beam-splitting film is used to split the emitted light reflected by the second optical surface, and when the emitted light reflected by the second optical surface has different wavelength bands, the beam-splitting wavelength range of the same beam-splitting film can cover the wavelength range of emitted light of different wavelengths.

[0109] For example, in this 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 are all provided with the same optical film FT4. This optical film FT4 can be a broadband beam-splitting film. Simultaneously, this optical film FT4 at least covers a broadband band (370–650 nm) of the emitted light bands of the aforementioned UV_LED, G_LED, and R_LED, exhibiting consistent low-reflection partial reflection characteristics of less than or equal to 10% and high-transmission characteristics of greater than or equal to 90% within the broadband band of 370–650 nm. The use of the same optical film FT4 in this embodiment simplifies the process and reduces system costs.

[0110] In some embodiments, the light source detection device further includes an aperture stop, wherein the front end of the first photoelectric sensor 81, the second photoelectric sensor 82, the third photoelectric sensor 83 and the fourth photoelectric sensor 84 is provided with an aperture stop.

[0111] This application adjusts the amount of light incident on the first photoelectric sensor 81, the second photoelectric sensor 82, the third photoelectric sensor 83, and the fourth photoelectric sensor 84 by limiting the size of the aperture, so as to achieve a balance between detection sensitivity and maximum detection saturation light amount, and realize high dynamic range light amount monitoring.

[0112] In some embodiments, the light source detection device further includes a background light detector 8A, the position of which corresponds to the position of the second photoelectric sensor 82.

[0113] For example, such as Figure 5CAs shown, a background light detector 8A is configured to eliminate the influence of background stray light on the measurement results of the second photoelectric sensor 82. In this application, a background light detector 8A is configured on one side of the second photoelectric sensor 82. The background light detector 8A can hardly receive the detection beam transmitted through the first optical region R1 by the B-LED emitted light. By subtracting the background light signal detected by the background light detector 8A from the detection signal of the second photoelectric sensor 82, a B-light detection signal that is more consistent with the output B-light is obtained, thereby achieving more precise control of the B-light quantity.

[0114] Furthermore, in order to avoid using the background light detector 8A, this application can use the first photoelectric sensor 81 as the background light detection photoelectric detector, which is basically unable to receive the B light detection beam, thereby simplifying the system.

[0115] Furthermore, such as Figure 5C As shown, this application also includes a background light detection photodetector 8B. The background light detection photodetector 8B is located outside the diameter of the UV light detection beam obtained by reflecting the approximately collimated beam C1 through the second optical surface 31B. That is, the background light detection photodetector 8B receives almost no UV light reflected by the second optical surface 31B. By subtracting the background light signal detected by the background light detection photodetector 8B from the detection signal of the first photoelectric sensor 81, a UV light detection signal that is more consistent with the output UV light is obtained, thereby achieving higher precision UV light quantity control. Similarly, corresponding background light detection photodetectors can be set for the third photoelectric sensor 83 and the fourth photoelectric sensor 84 to eliminate the influence of background stray light and improve detection accuracy, which will not be elaborated here.

[0116] In some embodiments, the light source detection device further includes a filter, and the front end of the first photoelectric sensor 81, the second photoelectric sensor 82, the third photoelectric sensor 83 and the fourth photoelectric sensor 84 is provided with a filter.

[0117] To achieve stable color tone and high-precision control of illumination light brightness, spectral filtering can be applied to the spectrum of the light beam detected by one or more photoelectric sensors. Optionally, this application applies spectral filtering to the spectra of the light beams detected by the first photoelectric sensor 81, the second photoelectric sensor 82, the third photoelectric sensor 83, and the fourth photoelectric sensor 84. Filters are configured in the measurement optical paths of the first photoelectric sensor 81, the second photoelectric sensor 82, the third photoelectric sensor 83, and the fourth photoelectric sensor 84 to cut off portions exceeding the spectral range of the output illumination light, thereby achieving a measurement spectrum that is consistent with or approximately similar to the output spectra B1 to B4 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.

[0118] This application ensures the accuracy of light quantity detection by establishing a strong correlation between the light quantity detection of the first photoelectric sensor 81, the second photoelectric sensor 82, the third photoelectric sensor 83, and the fourth photoelectric sensor 84 and the output components 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 the output light, thereby maintaining the stability of the lighting color tone and luminous flux, and also simplifying the light quantity control strategy.

[0119] In the design, at least a bandpass filter L3 with transmission characteristics in the spectral range B3 is configured at the front end of the third photoelectric sensor 83 to effectively filter out the blue excitation light in the emission spectrum of the fluorescent G-LED, and keep the spectrum of the G-LED detection beam approximately or consistent with the output spectrum B3; or, a short-pass or bandpass filter L1 with transmission characteristics in the spectral range B1 is configured at the front end of the first photoelectric sensor 81; a bandpass filter L2 with transmission characteristics in the spectral range B2 is configured at the front end of the second photoelectric sensor 82; and a long-pass or bandpass filter L4 with transmission characteristics in the spectral range B4 is configured at the front end of the fourth photoelectric sensor 84.

[0120] In some embodiments, the light source detection device further includes a plurality of collimating lenses, wherein the emitted light from each light source passes through the corresponding collimating lens and then illuminates the corresponding dichroic mirror.

[0121] For example, such as Figure 2 As shown, the light source detection device includes a first collimating lens 21, a second collimating lens 22, a third collimating lens 23, and a fourth collimating lens 24. The first collimating lens 21, the second collimating lens 22, the third collimating lens 23, and the fourth collimating lens 24 collimate the illumination light emitted 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, respectively, to obtain approximately collimated beams C1 to C4. Subsequently, the first dichroic mirror 31, the second dichroic mirror 32, and the third dichroic mirror 33 complete the optical path integration by transmitting or reflecting the corresponding approximately collimated beams C1 to C4, to obtain the combined beam C5.

[0122] In some embodiments, the light source detection device further includes a focusing lens disposed on the illumination path of the output synthesized light. For example... Figure 2 As shown, 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. The focused light beam A is coupled into the corresponding guide beam 5.

[0123] In some embodiments, such as Figure 1 As shown, the light source detection device also includes a heat dissipation unit 20, which is positioned corresponding to the position of the light source unit and is used to dissipate heat from the light source unit.

[0124] During use, the relevant 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 of light emitted and the spectrum. The heat generated during the operation of the LED causes the junction temperature (PN junction temperature) to rise. On the one hand, this causes the peak wavelength to drift, and on the other hand, the luminous flux decreases as the junction temperature rises. This is particularly noticeable with the R_LED used in the fourth LED light-emitting element 14. The endoscope light source device performs heat dissipation control on each LED light-emitting element to maintain the operating temperature within a reasonable range.

[0125] The heat dissipation unit 20 can employ various combined heat dissipation methods, such as using thermally conductive adhesive, thermally conductive sheets, heat dissipation fins, water cooling, or liquid cooling to conduct heat dissipation for each LED light-emitting element; furthermore, the heat dissipation unit 20 also includes one or more fans disposed on each LED light-emitting element or in the external space for air cooling, used to dissipate heat from each LED light-emitting element and / or other components of the endoscope light source device (such as circuit control components) as a whole.

[0126] The light source detection device in this application is not limited to detecting four LED light-emitting elements, such as... Figure 6 As shown, 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, a fourth LED light-emitting element 14, and a fifth LED light-emitting element 15; Figure 7A The spectral curves of each LED and dichroic mirror are given; Figure 7B , Figure 7C , Figure 7D as well as Figure 7E The spectral curves of the fourth, third, second, and first dichroic mirrors are given accordingly. Figure 7F Given Figure 6 Spectral curves of the second dichroic mirrors F2 and F2B in the image; Figure 8 Corresponding to Figure 6 The detection device, in addition to the aforementioned, also includes a fifth collimating lens 25, a fourth dichroic mirror 34, and a fifth photoelectric sensor 85.

[0127] Figure 6The device described above adds an amber LED 15 (A-LED) compared to the previous one. That is, the five LED light-emitting elements LED11 to 15 are ultraviolet LED 11 (UV-LED), blue LED 12 (B-LED), green LED 13 (G-LED), red LED 14 (R-LED), and amber LED 15 (A-LED). Among them, the amber LED 15 (A-LED) preferably has a peak wavelength of 590-610nm. Hemoglobin has a large variation in the degree of light absorption near 600nm. The peak wavelength of LED 14 (R-LED) is located at 620-640nm, which has a smaller light absorption coefficient than the 600nm wavelength. At the same time, the scattering coefficient of living tissue is also smaller. Based on the difference in the absorption and scattering characteristics of the narrow band light near 600nm and 630nm of the emission spectrum of LED 15 and LED 16, it is beneficial to improve the visibility of deep blood vessels. The other structures are the same as those described above, and will not be repeated here. A beam splitter F1B is provided on the second optical surface of the first dichroic mirror 31; the beam splitter F3B can reflect and transmit the light beam emitted by the second LED light-emitting element 12 to obtain a B-light detection beam, which enters the second photoelectric sensor 82 for detection.

[0128] Specifically, the wavelength of the transition region of the first optical surface of the first dichroic mirror 31A is in the range of 410-430nm. For ultraviolet light (≤420nm) emitted by the UV-LED, its transmittance reaches the optimal transmittance T1 according to the coating process, preferably T1≥97%. At the same time, for blue light (≥420nm) emitted by the B-LED, it has a spectral splitting characteristic with reflection characteristics as the main feature and transmission characteristics as the secondary feature. Preferably, the reflectance R1 and transmittance T2 of the first optical surface 31A in the wavelength band above 430nm are... Through the beam-splitting film design, it has the characteristics of transmitting less than or equal to 10% of B light and reflecting more than or equal to 90% of B light. The F1B coating characteristics are high transmittance of violet light emitted by UV_LED and reflect more than or equal to 90% of blue light emitted by B_LED while transmitting less than or equal to 10%. This allows the UV_LED emitted light to be combined with the B_LED light, achieving transmissive beam splitting of B_LED. The light is then used as detection light to enter the luminous flux measurement device PD82 to detect the output luminous flux of B_LED.

[0129] The emitted light from the R_LED is reflected sequentially by the first optical surface 34A of the fourth dichroic mirror 34, then by the first optical surface 33A of the third dichroic mirror 33, and then by the second optical surface 32B of the second dichroic mirror 32 to obtain the R-light detection beam. This beam is then used as the detection light to enter the luminous flux measuring device PD84 to detect the output luminous flux of the R_LED.

[0130] The optical path integration of G_LED is carried out before the optical path integration of B_LED. The first optical surface 32A of the dichroic mirror 32, which serves as the optical path integration of G_LED and B_LED, cuts off the blue excitation light in the emitted light of G_LED. It has the characteristics of completely cutting off the blue excitation light in the reflected light of G_LED and completely reflecting the emitted light of B_LED. That is, the reflectivity of the 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.

[0131] Since the other inspection principles in this application embodiment are the same as those described above, they will not be repeated here.

[0132] like Figure 9 As shown, this application also provides a schematic diagram of the detection optical 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, a fourth LED light-emitting element 14, and a fifth LED light-emitting element 15. 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 described above and will not be repeated here. The fifth LED light-emitting element 15 is an amber light source. Figure 10 The spectral curve of the first dichroic mirror 31 in this embodiment is given. Figure 11 A schematic diagram illustrating the detection of changes in the optical path using this optical device is provided.

[0133] Specifically, the five-way light combining system includes a first LED light-emitting element 11, a second LED light-emitting element 12, a third LED light-emitting element 13, a fourth LED light-emitting element 14, and a fifth LED light-emitting element 15, which correspond to ultraviolet (UV-LED), blue (B-LED), green (G-LED), red (R-LED), and amber (A-LED).

[0134] In this process, the optical path integration of G_LED is performed after the optical path integration of B_LED. Furthermore, the light source unit performs optical path integration sequentially from short to long according to the emission wavelength. As a result, the first optical surface 31A of the first dichroic mirror 31, 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-wavelength or short-wavelength characteristics, which simplifies the coating process and reduces system costs.

[0135] 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 below. Figure 3C and 3B As shown; the characteristics of the first optical surface 32A of the second dichroic mirror 32 are shown in [reference needed]. Figure 7CAs shown; the first optical surface 31A of the first dichroic mirror 31 has a long-wavelength pass characteristic with a transition region wavelength of about 600-630nm, which transmits light from R_LED above 610nm and reflects light from A-LED below 610nm, thus completing the optical path integration of the violet, blue, green and amber light emitted by UV_LED, B_LED, G_LED and A_LED with the red light emitted by R_LED;

[0136] The device achieves stable color tone and precise control of output light through feedback control of the luminous flux of each LED. Specifically, multiple luminous flux measuring devices 81-85 are set to detect the output luminous flux of each LED. Preferably, the luminous flux measuring devices 81-85 have photoelectric sensors PD81-85.

[0137] The beam-splitting characteristics of the second optical surfaces 31B, 33B, and 34B of the dichroic mirrors 31, 33, and 34 are used to split the emitted light from R_LED, G_LED, and UV_LED into the corresponding luminous flux measuring devices 84, 83, and 81. The beam-splitting characteristics of the second optical region R2 on the first optical surface 32A of the dichroic mirror 32 are used to split the emitted light from A_LED through the second optical region R2 and into the luminous flux measuring device 85. The beam-splitting characteristics of the first optical surface of the dichroic mirror 34 are used to split the emitted light from A_LED through the second optical region R2 and into the corresponding luminous flux measuring device 85. The beam splitting characteristics of the second optical region R2 of 34A, or the beam splitting characteristics of the first optical surface 34A on the dichroic mirror 34, transmit and split the emitted light from the B_LED and enter the luminous flux measuring device 82; the beam splitting characteristics of the second optical surfaces 31B, 33B, and 34B of the dichroic mirrors 31, 33, and 34, as well as the partition coating characteristics or dichroic beam splitting characteristics of the first optical surfaces 32A and 34A of the dichroic mirrors 32 and 34, are designed in the same way as in embodiments one to three, so that each LED can complete beam splitting detection while integrating the optical path.

[0138] 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, they have a beam splitting film F5 that simultaneously transmits about 95% of the amber light emitted by the A-LED and reflects about 5% of the blue light emitted by the B-LED, or an anti-reflection film F6 with anti-reflection properties. Referring to the second coating process of Embodiment 1, the second optical regions R2 of the first optical surfaces 32A and 34A of the dichroic mirrors 32 and 34 can be coated in the same batch, simplifying the coating process and reducing system costs.

[0139] Light flux measuring devices 81 and 82, offsetting light flux measuring device 82, photoelectric sensors PD81 and PD82 are in Figure 9 The detection optical path shown is arranged vertically or horizontally side by side to optimally receive the detection light from LED11 and LED12.

[0140] An example of how this device detects changes in the optical path is shown below. Figure 11 As shown, optionally, the spectral detection scheme for the B light emitted by the B_LED employs a method where the second optical surface 32B of the dichroic mirror 32 is configured to have beam-splitting characteristics. The B_LED emitted light is reflected sequentially by the first optical surfaces 34A and 33A of the dichroic mirrors 34 and 33, and then enters the second optical surface 32B of the dichroic mirror 32 for spectral splitting to obtain the B light for detection and observation. This B light is then used as the detection light to enter the luminous flux measuring device 82, achieving B light reflection and spectral splitting detection. The luminous flux measuring devices 82 and 85 deflect the luminous flux measuring device 82, and the photoelectric sensors 82 and 85 are... Figure 10 The second optical device shown is arranged vertically or horizontally in the detection optical path space.

[0141] Preferably, the ratio of the amount of light received by the luminous flux measuring devices 81-85 to the amount of light emitted by each LED is moderate. On the one hand, it achieves sufficient light to meet the system's monitoring accuracy; on the other hand, it avoids excessive light emission, preventing excessive detection light from saturating the photoelectric sensors 11-15. It also achieves the maximum dynamic detection range required by the system, enabling high-precision and high-dynamic-range detection of the luminous flux of each LED without excessive loss of effective output illumination light.

[0142] Simultaneously, the fluorescent G-LED emits green light while also possessing blue excitation light. To prevent the blue excitation light of the G-LED from being transmitted into the effective illumination light path through the dichroic beam splitting characteristics of the dichroic mirror in the downstream optical path, the detection optical path must meet the following conditions:

[0143] The first optical surface of the dichroic mirror that integrates the optical paths of G_LED and B_LED achieves the cutoff of blue excitation light in the emitted light of G_LED, and has the characteristics of completely cutting off blue excitation light in the reflected light of G_LED and completely reflecting the emitted light of B_LED. That is, the reflectivity of blue light emitted by B_LED reaches the highest level according to the coating process, and it has almost no spectral splitting characteristics of transmitted blue light.

[0144] The above conditions restrict the mixing of the blue excitation light of G_LED and the blue light emitted by B_LED in the output illumination light, so that the spectral curves of each light source in the output illumination light are independent and there is as little or almost no overlap between the bands as possible; the detection optical path of the endoscope light source device 100 that uses other fluorescent LEDs for light combining has similar characteristics.

[0145] Under the premise of meeting the above conditions and detection effect, the detection optical path can have different combinations and variations according to the above-mentioned multiple detection schemes, which belong to the scope of this invention.

[0146] like Figure 1As shown, the endoscope system of this 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. The light source detection device 100 includes N light source units and a light combining module 10. The light source type of the light source units 11 to 1N is LED or LD, including fluorescent LED or LD, such as fluorescent green LED or LD, or other types of light sources.

[0147] The endoscope 101 includes a light guide 50 disposed therein, which is composed of a light guide beam 5; the endoscope 101 also includes an illumination lens 51 disposed at the front end and a camera module 60, the camera module 60 including a camera objective lens and an image sensor, such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) sensor and other photoelectric conversion devices; the endoscope 101 also includes connecting cables distributed in the endoscope 101.

[0148] The light combining module 10 integrates the output light from each light source section 11 to 1N and outputs a composite light. The composite light is coupled into the light guide section 50 inside the endoscope 101. The light guide section 50 contains a beam guide 5 composed of closely arranged optical fibers for light propagation. The beam guide 50 is transmitted to the front illumination lens 51 for beam diffusion, forming illumination light projected onto the observation target.

[0149] The light source detection device 100 provides the illumination light required for observing the target (living tissue in the body cavity). The camera module 60 images the observation area (living tissue mucosa and blood vessels, etc.). The light guide 50 transmits the output light of the light source detection device 100 to the front end of the endoscope 101. The illumination lens 51 diffuses the illumination light at the divergence angle 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 for signal processing via the connecting cable, and then output to the display unit 80 for image display.

[0150] The control unit 40 adjusts the output luminous flux based on the driving current (or voltage) of each light source unit 11 to 1N, or changes the luminous flux by adjusting the current pulse duty cycle (PWM). The control unit 40 controls the working state of the light source detection device 100 and the camera module 60. For example, it controls the output luminous flux ratio of each light source unit 11 to 1N according to a preset luminous flux ratio, adjusts the output luminous flux of each light source unit 11 to 1N as a whole according to the brightness level of the image captured by the camera module 60, or switches between various illumination modes such as ordinary white light, mixed light, or special light according to external input commands from the input unit 70.

[0151] Specifically, the control unit 40 uses the measurement results from the luminous flux measuring devices to achieve feedback control of the driving current (or voltage) of each LED light-emitting element. First, the detection signals of each luminous flux measuring device are calibrated to establish the correspondence between the driving current of each light source, the detection signal, and the output luminous flux components of each LED light-emitting element. During calibration, the driving current of each LED light-emitting element is changed or increased point by point, and the detection signal of each luminous flux measuring device and the output luminous flux components of each LED light-emitting element are tested at the corresponding current. The relationship curve of the driving current, detection signal, and output luminous flux of each LED light-emitting element is obtained to complete the calibration. Then, the calibration results are stored in the control unit 40. By detecting the real-time signals of each luminous flux measuring device and combining the calibration results, the feedback control of the output light of each LED light-emitting element is accurately realized.

[0152] 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, thereby obtaining a variety of observation modes suitable for the endoscope system. Basically, the system includes a standard light observation mode M1 with white light illumination, which obtains an overall contour image of the living tissue; a first special light observation mode M2, which differs from standard white light illumination, for example, by setting the output luminous flux of the first LED light-emitting element 11 or the second LED light-emitting element 12 emitting violet or blue light as the main illumination light component, and using the high absorption characteristics of violet or blue light by blood in blood vessels for emphasized observation of superficial or superficial blood vessels; or, a mixed light observation mode M3, which differs from both standard and special light illumination, having a portion of the spectrum of special light illumination and a portion of the spectrum of standard light illumination, to obtain a mixed spectrum output that is different from both, achieving an image that takes into account both the overall contour of the living tissue and the emphasized observation of blood vessels; and a second special light observation mode M4, which is used for observing bleeding points, by setting the third LED light-emitting element 13, the fifth LED light-emitting element 15, and the fourth LED light-emitting element 14 emitting green, amber, and red light to work simultaneously, displaying the location of bleeding points on the observed image.

[0153] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0154] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A light source detection device, characterized in that, include: At least two light source units, wherein the light source units include light-emitting diodes or laser diodes; Each of the aforementioned light sources is used to output emitted light; The at least two light source units include a first light source unit and a second light source unit; At least one dichroic mirror, the dichroic mirror having a first optical surface and a second optical surface, after the first light source and the second light source emit light, the first optical surface is used to integrate the emitted light from the first light source and the second light source and output composite light, and the second optical surface is used to split the emitted light emitted by either the first light source or the second light source and detect the light quantity. The light source detection device further includes at least one luminous flux measuring element for detecting emitted light, the position of which corresponds to the position of the light source to be detected; the second optical surface can use the reflected light obtained by splitting the emitted light from the first light source as detection light and reflect it into the luminous flux measuring element, and the first optical surface can transmit the transmitted light obtained by splitting the emitted light from the first light source. At least one dichroic mirror has a first optical region R1 and a second optical region R2 disposed on its first optical surface. The first optical region R1 is used to transmit the emitted light from the first light source and reflect the emitted light from the second light source to obtain the reflected light from the second light source. The reflected light from the second light source and the transmitted light from the first light source are optically integrated to output the composite light. The second optical region R2 is used to transmit the emitted light from the second light source, so that the emitted light from the second light source is transmitted into the corresponding light flux measuring device. The first optical region occupies more than or equal to 90% of the area of ​​the first optical surface, the second optical region occupies less than or equal to 10% of the area of ​​the first optical surface, and either a beam splitter or an antireflective coating is disposed on the second optical region.

2. The light source detection device according to claim 1, characterized in that, The at least one dichroic mirror includes a second dichroic mirror, which is at least one dichroic mirror other than the one corresponding to the first light source and the second light source. The first optical surface on the second dichroic mirror can only output synthesized light after optical path integration, or At least one of the first optical surfaces on the dichroic mirror is capable of transmitting light for light quantity detection.

3. The light source detection device according to claim 1, characterized in that, A dichroic filter film is provided on the first optical region.

4. The light source detection device according to claim 1, characterized in that, The photosensitive surface of the corresponding luminous flux measuring device, transmitted through the second optical area, is aligned with the detection optical axis of the dichroic mirror transmitted through the second optical area.

5. The light source detection device according to claim 4, characterized in that, The size of the light beam transmitted through the second optical zone to the corresponding light flux measuring device is larger than the size of the photosensitive surface.

6. The light source detection device according to claim 1, characterized in that, The photosensitive surface of the corresponding luminous flux measuring device, which is reflected by the second optical surface, is set perpendicular to the direction of the detection optical axis of the dichroic mirror reflected by the second optical surface.

7. The light source detection device according to claim 6, characterized in that, The photosensitive surface size reflected by the second optical surface to the corresponding luminous flux measuring element is smaller than the beam size of the detection light on the first light source.

8. The light source detection device according to claim 1, characterized in that, The light source detection device also includes a background light detector, which is located outside the range covered by the corresponding detection beam on the corresponding luminous flux measuring device.

9. The light source detection device according to claim 1, characterized in that, The light source detection device further includes an aperture stop, and the aperture stop is provided at the front end of at least one of the luminous flux measuring devices.

10. The light source detection device according to claim 1, characterized in that, The light source detection device further includes a filter, and the filter is disposed at the front end of at least one of the light flux measuring devices.

11. The light source detection device according to claim 1, characterized in that, There are multiple dichroic mirrors; A beam-splitting film is respectively disposed on the second optical surface of a plurality of dichroic mirrors. The beam-splitting film is used to split the emitted light from the corresponding light source. Each beam-splitting film is used to split the emitted light of a different wavelength. The beam-splitting wavelength range of the beam-splitting film is determined by the wavelength of the emitted light.

12. The light source detection device according to claim 1, characterized in that, There are multiple dichroic mirrors; The same beam-splitting film is disposed on the second optical surface of multiple dichroic mirrors; the same beam-splitting film is used to split the emitted light reflected by the second optical surface. When the emitted light reflected by the second optical surface has different wavelength bands, the wavelength range of the beam splitting film can cover the wavelength range of the emitted light with different wavelength bands.

13. The light source detection device according to any one of claims 11 or 12, characterized in that, The beam splitter is capable of reflecting less than or equal to 10% of the light beam and enabling greater than or equal to 90% of the light beam to be transmitted.

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