A light source device and an endoscopic imaging system

Abstract

The present invention provides a light source device and an endoscope imaging system. The light source device includes a light source component for emitting illumination light, a first rotating member, a second rotating member, and a third rotating member that are arranged in sequence along the light-emitting direction of the light source component on the light-emitting side of the light source component. The rotation axes of the first rotating member, the second rotating member, and the third rotating member are all parallel to the light-emitting direction of the light source component. The first rotating member includes a first hollow hole and a disk surface provided around its rotation axis. The second rotating member includes a plurality of narrow-band filters provided around its rotation axis. The third rotating member includes a red filter, a green filter, a blue filter, and a third hollow hole provided around its rotation axis. In the light source device of the present invention, through the mutual cooperation of the first rotating member, the second rotating member, and the third rotating member, it is possible to be compatible with a variety of image sensors to achieve a hyperspectral imaging function, with strong compatibility and conducive to reducing the overall volume of the light source device.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a light source device and an endoscope imaging system. Background Art

[0002] In modern medicine, endoscope imaging devices are often used to observe important organs and tissues inside the human body in vivo. Through the color image information of the internal mucosa or tissue organs of the human body, doctors can make a preliminary diagnosis of the patient's disease.

[0003] Hyperspectral imaging technology is the combination of spectral technology and imaging technology, that is, after irradiating an object with multiple narrow-band lights, the photographed object in each spectral band is imaged. Different tissues in the human body have specific absorption spectra. By using hyperspectral imaging technology and with the help of narrow-band spectral recognition, the structures and information of different biological tissues in the human body can be distinguished, and different lesions of different tissues can be identified. For example, using hyperspectral imaging technology, early cancers can be screened and identified.

[0004] Applying hyperspectral imaging technology to the field of endoscopes to achieve in vivo hyperspectral imaging observation of internal tissues helps to give an accurate medical diagnosis result of the patient's physical condition and provides strong help for the early detection of cancer.

[0005] At present, existing hyperspectral endoscope imaging devices generally include an endoscope body, a hyperspectral light source, and an image processing unit. The endoscope body is partially inserted into the human body to provide an optical path carrier and an instrument channel; the hyperspectral light source is split by switching multiple narrow-band filters or rotating a reflection grating, and emits narrow-band lights in multiple spectral bands, so as to provide in vivo illumination for hyperspectral shooting and achieve the hyperspectral imaging function; the image processing unit processes the hyperspectral image. For example, a multispectral endoscope imaging device with the application number CN201710046429.8 performs hyperspectral shooting by rotating a runner equipped with multiple narrow-band filters; another example is a hyperspectral endoscope imaging system with the application number CN201410538199.3, which is split by rotating a reflection grating to emit lights in each spectral band for illumination imaging; both of the above two structures can achieve the hyperspectral function.

[0006] However, existing hyperspectral light sources usually need to be matched with a specific image sensor for imaging to achieve the hyperspectral function. For example, only a global exposure color sensor can be used. The exposure time of the global exposure sensor is short and the noise is large. It is very difficult to make a small-sized and high-pixel image sensor, resulting in a large volume and weight of the endoscope device and high costs; the sensitivity response curve of the color sensor is low, and the signal-to-noise ratio of the image obtained by the existing hyperspectral light source is poor, and a high-cost image sensor needs to be used. Summary of the Invention

[0007] The present invention provides a light source device and an endoscope imaging system, which are used to solve the defects that the hyperspectral light source device in the prior art cannot be compatible with progressive exposure and global exposure, black-and-white sensors and color sensors, and realize the hyperspectral imaging function compatible with multiple sensors.

[0008] The present invention provides a light source device, including:

[0009] A light source assembly for emitting illumination light;

[0010] A first rotating member, a second rotating member, and a third rotating member that are arranged in sequence along the light-emitting direction of the light source assembly on the light-emitting side of the light source assembly, and the rotation axes of the first rotating member, the second rotating member, and the third rotating member are all parallel to the light-emitting direction of the light source assembly; and

[0011] A driving mechanism for driving the first rotating member, the second rotating member, and the third rotating member to rotate respectively;

[0012] Wherein, the first rotating member includes a first empty hole and a disk surface arranged around its rotation axis, and the first rotating member can rotate around its rotation axis and drive the first empty hole and the disk surface to be respectively switched into the light-emitting optical path of the light source assembly;

[0013] The second rotating member includes a plurality of narrow-band filters arranged around its rotation axis, and the second rotating member can rotate around its rotation axis and drive the plurality of narrow-band filters to be respectively switched into the light-emitting optical path of the light source assembly;

[0014] The third rotating member includes a red filter, a green filter, a blue filter, and a third empty hole arranged around its rotation axis, and the third rotating member can rotate around its rotation axis and drive the red filter, the green filter, the blue filter, and the third empty hole to be respectively switched into the light-emitting optical path of the light source assembly.

[0015] According to the light source device provided by the present invention, the first rotating member includes two rotating baffles that are overlapped at the center, the rotating baffle is provided with a fan-shaped opening around the center, and the overlapping part of the fan-shaped openings of the two rotating baffles forms the first empty hole, and the remaining parts of the two rotating baffles form the disk surface; the two rotating baffles can also rotate relatively around an axis perpendicular to the center of the rotating baffle to adjust the size of the overlapping part of the fan-shaped openings of the two rotating baffles.

[0016] According to the light source device provided by the present invention, the light source device further includes a controller, the controller is electrically connected to the light source assembly and the driving mechanism, and the controller is used to control the light source assembly to emit illumination light and control the driving mechanism to drive the first rotating member, the second rotating member and the third rotating member to rotate respectively, so as to control the illumination mode of the light source device;

[0017] The light source device includes a hyperspectral illumination mode. In the hyperspectral illumination mode, the first rotating member rotates, the second rotating member rotates, and the third rotating member stops at a position where the third empty hole is located in the light-emitting optical path of the light source assembly, and is suitable for providing hyperspectral illumination for a black-and-white sensor or a color sensor.

[0018] According to the light source device provided by the present invention, the second rotating member further includes a first infrared filter and a first special light filter, and the first infrared filter, the first special light filter and the plurality of narrow-band filters are linearly arranged around the rotation axis of the second rotating member.

[0019] According to the light source device provided by the present invention, the light source device further includes a normal light illumination mode and a special light illumination mode;

[0020] In the normal light illumination mode, the first rotating member rotates, the second rotating member stops at a position where the first infrared filter is located in the light-emitting optical path of the light source assembly, the third rotating member rotates, and is suitable for providing normal light illumination for a black-and-white sensor; or, the first rotating member rotates, the second rotating member stops at a position where the first infrared filter is located in the light-emitting optical path of the light source assembly, and the third rotating member stops at a position where the third empty hole is located in the light-emitting optical path of the light source assembly, and is suitable for providing normal light illumination for a color sensor;

[0021] In the special light illumination mode, the first rotating member rotates, the second rotating member stops at a position where the first special light filter is located in the light-emitting optical path of the light source assembly, the third rotating member rotates, and is suitable for providing special light illumination for a black-and-white sensor; or, the first rotating member rotates, the second rotating member stops at a position where the first special light filter is located in the light-emitting optical path of the light source assembly, and the third rotating member stops at a position where the third empty hole is located in the light-emitting optical path of the light source assembly, and is suitable for providing special light illumination for a color sensor.

[0022] According to the light source device provided by the present invention, the fan angles of the red filter, the green filter, the blue filter and the third empty hole satisfy the following inequality group:

[0023] x1≥a×w2 / w1;

[0024] x2≥a×w2 / w1;

[0025] x3≥a×w2 / w1;

[0026] x4≥0°;

[0027] y + z≥0°;

[0028] x1 + 2y + z≤120°;

[0029] x1 + x2 + 2y + z≥120° + a×w2 / w1;

[0030] x1 + x2 + 4y + 2z≤180°;

[0031] x1 + x2 + x3 + 4y + 2z≥240° + a×w2 / w1;

[0032] x1 + x2 + x3 + x4 + 8y + 4z = 360°;

[0033] x1≥a×w3 / w1;

[0034] x3≥a×w3 / w1;

[0035] x1 + x2 + x3 + 4y + 2z≥180° + a×w3 / w1;

[0036] Wherein, w1 is the rotational angular velocity of the first rotating member, w2 is the rotational angular velocity of the third rotating member in the normal light illumination mode, w3 is the rotational angular velocity of the third rotating member in the special light illumination mode, a is the sector angle of the first hollow hole, y is the circular tangent angle of the light spot on the third rotating member, y + z is the sector angle corresponding to the interval on the third rotating member, x1 + y is the sector angle of the red filter, x2 + y is the sector angle of the green filter, x3 + y is the sector angle of the blue filter, and x4 + y is the sector angle of the third hollow hole.

[0037] According to the light source device provided by the present invention, the third rotating member includes an inner layer and an outer layer distributed radially, and the red filter, the green filter, the blue filter and the third hollow hole are arranged on the outer layer; the third rotating member further includes a second infrared filter and a second special light filter arranged on the inner layer around its rotation axis;

[0038] The third rotating member can also move in a direction perpendicular to its rotation axis and drive the inner layer and the outer layer to be respectively switched into the light output optical path of the light source assembly;

[0039] The second rotating member further includes a second empty hole, and the second empty hole, the first infrared filter, the first special light filter, and the plurality of narrowband filters are linearly arranged around the rotation axis of the second rotating member.

[0040] According to the light source device provided by the present invention, the controller is further configured to control the driving mechanism to drive the third rotating member to move in a direction perpendicular to its rotation axis, and the light source device further includes a normal light illumination mode, a special light illumination mode, and a dual light mode;

[0041] In the hyperspectral illumination mode, the first rotating member rotates, the second rotating member rotates, and the third rotating member stops at a position where the third empty hole in the outer layer is located in the light output optical path of the light source assembly, and is suitable for providing hyperspectral illumination for a black and white sensor or a color sensor;

[0042] In the normal light illumination mode, the first rotating member rotates, the second rotating member stops at a position where the first infrared filter is located in the light output optical path of the light source assembly, and the third rotating member moves to a position in the outer layer located in the light output optical path of the light source assembly and rotates, and is suitable for providing normal light illumination for a black and white sensor; or, the first rotating member rotates, the second rotating member stops at a position where the first infrared filter is located in the light output optical path of the light source assembly, and the third rotating member stops at a position where the third empty hole in the outer layer is located in the light output optical path of the light source assembly, and is suitable for providing normal light illumination for a color sensor;

[0043] In the special light illumination mode, the first rotating member rotates, the second rotating member stops at a position where the first special light filter is located in the light output optical path of the light source assembly, and the third rotating member moves to a position in the outer layer located in the light output optical path of the light source assembly and rotates, and is suitable for providing special light illumination for a black and white sensor; or, the first rotating member rotates, the second rotating member stops at a position where the first special light filter is located in the light output optical path of the light source assembly, and the third rotating member stops at a position where the third empty hole in the outer layer is located in the light output optical path of the light source assembly, and is suitable for providing special light illumination for a color sensor;

[0044] In the dual - light mode, the first rotating member rotates, and the second rotating member switches back and forth between the positions of the first special light filter and the first infrared filter in the light - emitting optical path of the light source assembly. The third rotating member moves to the outer layer in the light - emitting optical path of the light source assembly and rotates, being suitable for providing dual - light illumination for the black - and - white sensor; or, the first rotating member rotates, the second rotating member stops at the position of the second empty hole in the light - emitting optical path of the light source assembly, the third rotating member moves to the inner layer in the light - emitting optical path of the light source assembly and rotates, being suitable for providing dual - light illumination for the color sensor.

[0045] According to the light source device provided by the present invention, the light source device further includes a first optical device, a second optical device, and a third optical device. The first optical device, the second optical device, and the third optical device are arranged in sequence along the light - emitting direction of the light source assembly on the light - emitting side of the light source assembly. The first optical device is used for performing a first focusing on the illumination light emitted by the light source assembly, the second optical device is used for guiding the light that has undergone the first focusing into parallel light, and the third optical device is used for performing a second focusing on the parallel light; the first rotating member is arranged between the first optical device and the second optical device, the second rotating member is arranged between the first rotating member and the second optical device, and the third rotating member is arranged between the second optical device and the third optical device.

[0046] The present invention also provides an endoscope imaging system, including: an endoscope and the light source device as described in any one of the above.

[0047] The light source device and the endoscope imaging system provided by the present invention, by setting the first rotating member, the second rotating member, and the third rotating member, and the three rotating members cooperate with each other, can achieve the function of high - spectral imaging by being compatible with various image sensors such as progressive - scan sensors and global - exposure sensors, black - and - white sensors and color sensors. It has strong compatibility and a wide range of applications, which is beneficial to improving the quality of high - spectral imaging, optimizing the signal - to - noise ratio of the imaged image, and is also beneficial to reducing the overall volume of the high - spectral light source and lowering the cost, solving the defect that the light source device in the prior art cannot be compatible with progressive - scan and global - exposure, black - and - white sensors and color sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0049] Figure 1 It is a schematic diagram of the exposure state when a line-by-line exposure sensor is paired with a mechanical shutter;

[0050] Figure 2 It is a three-dimensional structural schematic diagram of the light source device provided by an embodiment of the present invention;

[0051] Figure 3 It is a top view of the light source device provided by an embodiment of the present invention;

[0052] Figure 4 It is a three-dimensional structural schematic diagram of the first rotating member provided by an embodiment of the present invention;

[0053] Figure 5 It is a three-dimensional structural schematic diagram of the first rotating member provided by another embodiment of the present invention;

[0054] Figure 6 It is a timing diagram of the light source device provided by an embodiment of the present invention when paired with a line-by-line exposure sensor and operating in the hyperspectral mode;

[0055] Figure 7 It is a three-dimensional structural schematic diagram of the second rotating member provided by an embodiment of the present invention;

[0056] Figure 8 It is a timing diagram of the light source device provided by an embodiment of the present invention when paired with a line-by-line exposure black-and-white sensor and operating in the normal light illumination mode;

[0057] Figure 9 It is a timing diagram of the light source device provided by an embodiment of the present invention when paired with a line-by-line exposure color sensor and operating in the normal light illumination mode;

[0058] Figure 10 It is a transmission spectrum diagram of the red filter, green filter, blue filter, and first special light filter provided by an embodiment of the present invention;

[0059] Figure 11 It is a timing diagram of the light source device provided by an embodiment of the present invention when paired with a line-by-line exposure black-and-white sensor and operating in the special light illumination mode;

[0060] Figure 12 It is a timing diagram of the light source device provided by an embodiment of the present invention when paired with a line-by-line exposure color sensor and operating in the special light illumination mode;

[0061] Figure 13 It is a timing diagram of the light source device provided by an embodiment of the present invention when paired with a line-by-line exposure black-and-white sensor and operating in the dual-light mode;

[0062] Figure 14 It is a structural schematic diagram of the third rotating member provided by an embodiment of the present invention;

[0063] Figure 15 It is a timing diagram of the light source device provided by an embodiment of the present invention in cooperation with a color sensor with progressive exposure operating in a dual-light mode.

[0064] Reference numerals:

[0065] 1: Light source assembly; 2: First rotating member; 3: Second rotating member; 4: Third rotating member; 5: First optical device; 6: Second optical device; 7: Third optical device;

[0066] 11: Visible light lamp; 12: Ultraviolet and infrared lamp; 13: First collimating lens; 14: Second collimating lens; 15: Dichroic mirror; 16: Reflecting mirror; 21: First empty hole; 22: Disk surface; 23: Rotating shutter; 24: Sector opening: 31: Narrowband filter; 32: First infrared filter; 33: First special light filter; 34: Second empty hole; 41: Red filter; 42: Green filter; 43: Blue filter; 44: Third empty hole; 45: Second infrared filter; 46: Second special light filter;

[0067] 200: Light guiding device. Detailed implementation manners

[0068] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0069] Image sensors are classified into global shutter sensors and rolling shutter sensors (also called curtain shutter sensors) according to the exposure type, and into color sensors and black-and-white sensors according to the color.

[0070] Global shutter sensors are realized by all pixel points being exposed and extinguished simultaneously for data transmission. Its characteristics are short exposure time but large noise. Most CCD (Charge-coupled Device) image sensors use global exposure. Since each pixel has a storage unit, it is difficult to make a miniaturized high-pixel sensor.

[0071] The line-by-line exposure sensor exposes pixels line by line and then extinguishes them line by line for data transmission. Its characteristic is high frame rate. However, when the object moves rapidly, phenomena such as shaking and partial exposure will occur. Most CMOS (Complementary Metal Oxide Semiconductor) image sensors use line-by-line exposure.

[0072] As Figure 1 shown, the first horizontal row represents the working state of the line-by-line exposure sensor. When using the line-by-line exposure sensor, the sensor exposes pixels row by row. After the first row of pixels starts to be exposed, after a certain time interval, the second row of pixels starts to be exposed, and so on; there is a certain time interval for the start exposure time of each row of pixels, but the exposure time length of each row of pixels is the same. Finally, the exposure timing sequence of all pixels of the entire sensor presents as a parallelogram, and it can be seen that the exposure timing sequence of each frame of image presents as a parallelogram. Figure 1 The second horizontal row in

[0073] is the timing diagram of the working state of the line-by-line exposure sensor represented by a square wave, where the peak represents the sensor exposure and the trough represents the sensor extinction. Figure 1 The third horizontal row in Figure 1 is the timing diagram of the working state of the mechanical shutter represented by a square wave, where the peak represents the mechanical shutter passing light and the trough represents the mechanical shutter closing. After using the mechanical shutter, if the light passing time of the mechanical shutter is less than the common exposure time range of all pixels, each row of pixels can be exposed and extinguished simultaneously, so that problems such as object deformation, overexposure, and uneven color in the image when the photographed object changes can be eliminated.

[0074] The difference between a color sensor and a black-and-white sensor is that a Bayer filter is provided on the image sensor of the color sensor, which can realize the recognition of red, green, and blue colors. While the black-and-white sensor needs to be additionally equipped with a red, green, and blue color wheel for red, green, and blue color recognition, and then uses time-sharing imaging technology to obtain a color image. The Bayer filter of the color sensor has a smaller sensitivity response than the black-and-white sensor in the hyperspectral mode.

[0075] The existing hyperspectral endoscope light source device can only use a globally exposed color sensor to achieve the hyperspectral imaging function, and cannot be compatible with the use of a line-by-line exposed sensor and a black-and-white sensor. The globally exposed one has large noise, it is difficult to make a miniaturized image sensor, and the cost is high; the sensitivity response curve of the color sensor is lower than that of the black-and-white sensor. For the image finally obtained by the existing hyperspectral endoscope light source device, the signal-to-noise ratio may be relatively poor and the cost is high.

[0076] The following will describe the light source device of the present invention in conjunction with Figures 2 - 15 to describe.

[0077] As Figure 2 and Figure 3 shown, the light source device provided by the present invention includes a light source assembly 1, a first rotating member 2, a second rotating member 3, a third rotating member 4 and a driving mechanism. The light source assembly 1 is used for emitting illumination light; the first rotating member 2, the second rotating member 3 and the third rotating member 4 are arranged on the light-emitting side of the light source assembly 1 and are arranged in sequence along the light-emitting direction of the light source assembly 1, and the rotation axes of the first rotating member 2, the second rotating member 3 and the third rotating member 4 are all parallel to the light-emitting direction of the light source assembly 1; the driving mechanism is used for driving the first rotating member 2, the second rotating member 3 and the third rotating member 4 to rotate respectively.

[0078] Among them, the first rotating member 2 includes a first empty hole 21 and a disk surface 22 arranged around its rotation axis. The first rotating member 2 can rotate around its rotation axis and drive the first empty hole 21 and the disk surface 22 to be respectively switched into the light-emitting optical path of the light source assembly 1. The second rotating member 3 includes a plurality of narrow-band filters 31 arranged around its rotation axis. The second rotating member 3 can rotate around its rotation axis and drive the plurality of narrow-band filters 31 to be respectively switched into the light-emitting optical path of the light source assembly 1. The third rotating member 4 includes a red filter 41, a green filter 42, a blue filter 43 and a third empty hole 44 arranged around its rotation axis. The third rotating member 4 can rotate around its rotation axis and drive the red filter 41, the green filter 42, the blue filter 43 and the third empty hole 44 to be respectively switched into the light-emitting optical path of the light source assembly 1.

[0079] In the light source device of the above embodiment, the first rotating member 2 is provided with a first empty hole 21 for being compatible with a progressive exposure sensor and a global exposure sensor. By rotating the first rotating member 2, the first empty hole 21 and the disk surface 22 are alternately located in the light output optical path of the light source assembly 1, and an exposure sequence of 1010 can be realized, that is, the exposure timing of a mechanical shutter is realized. At this time, it can be paired with a progressive exposure sensor; when the first rotating member 2 stops at the position where the first empty hole 21 is located in the light output optical path of the light source assembly 1 or the first rotating member 2 rotates at the shooting frame rate of the image sensor, an exposure sequence of 1111 can be realized, that is, continuous light transmission. At this time, it can be paired with a global exposure sensor. On the second rotating member 3, narrowband filters 31 of each spectral band are provided, mainly for realizing a hyperspectral imaging mode. By rotating the second rotating member 3, the narrowband filters 31 of each spectral band are alternately located in the light output optical path of the light source assembly 1, and hyperspectral imaging can be performed on different wavelength bands to obtain image data of imaging with each narrowband light. On the third rotating member 4, red, green, and blue color filters and a third empty hole 44 are provided, mainly for being compatible with a black-and-white sensor and a color sensor. When the third rotating member 4 rotates at a specific angular velocity, the red, green, and blue color filters are alternately located in the light output optical path of the light source assembly 1 to play a role in color recognition. At this time, it can be paired with a black-and-white sensor; when the third rotating member 4 stops at the position where the third empty hole 44 is located in the light output optical path of the light source assembly 1, it can be paired with a color sensor at this time.

[0080] In the light source device of the present invention, by providing the first rotating member 2, the second rotating member 3, and the third rotating member 4, the three rotating members cooperate with each other, and functions of compatible matching with a progressive exposure sensor and a global exposure sensor, a black-and-white sensor and a color sensor, etc. can be realized to perform hyperspectral shooting and imaging. It has strong compatibility, wide application range, is beneficial to improving the hyperspectral imaging quality, optimizing the signal-to-noise ratio of the imaging image, and is also beneficial to reducing the overall volume of the hyperspectral light source and lowering the cost, solving the defect that the light source device in the prior art cannot be compatible with progressive exposure and global exposure, and a black-and-white sensor and a color sensor, and has strong practicability.

[0081] Optionally, the wavelength bandwidth range of the illumination light provided by the light source assembly 1 is 400 - 1000 nanometers. The light source assembly 1 can provide a full-spectrum light source including infrared light.

[0082] Optionally, as Figure 2 and Figure 3 shown, the light source assembly 1 is a synthetic light source and is composed of a visible light lamp 11 and an ultraviolet and infrared lamp 12. Since the blue-violet light and the infrared light part of the visible light lamp 11 are weak, the ultraviolet and infrared lamp 12 is provided to complement the spectral range to obtain a full-spectrum light source.

[0083] Specifically, the visible light lamp 11 is a xenon lamp. There are multiple ultraviolet and infrared lamps 12, and the ultraviolet and infrared lamps 12 are LEDs (Light-Emitting Diodes) or LDs (Laser Diodes); for example, the ultraviolet and infrared lamps 12 include violet LEDs, blue LEDs, and infrared LEDs.

[0084] In a specific embodiment, the xenon lamp emits parallel illumination light output. The illumination light emitted by the violet LED, blue LED, and infrared LED is collimated into parallel light output through their respective first collimating lenses 13 and second collimating lenses 14, and then passes through the dichroic mirror 15 and the reflecting mirror 16, and is coupled into the xenon lamp optical path to output synthetic light in the wavelength range of 400 - 1000 nanometers.

[0085] Optionally, as Figure 2 and Figure 3 shown, the light source device further includes a first optical device 5, a second optical device 6, and a third optical device 7. The first optical device 5, the second optical device 6, and the third optical device 7 are arranged in sequence along the light output direction of the light source assembly 1 on the light output side of the light source assembly 1. The first optical device 5 is used to perform the first focusing on the illumination light emitted by the light source assembly 1, the second optical device 6 is used to guide the light after the first focusing into parallel light, and the third optical device 7 is used to perform the second focusing on the parallel light; the first rotating member 2 is disposed between the first optical device 5 and the second optical device 6, the second rotating member 3 is disposed between the first rotating member 2 and the second optical device 6, and the third rotating member 4 is disposed between the second optical device 6 and the third optical device 7.

[0086] By setting the first optical device 5, the illumination light emitted by the light source assembly 1 is first focused, so that the image-side aperture angle is not greater than 20°. The first rotating member 2 is at the first focal point. Then the synthetic beam passes through the second rotating member 3, and the incident angle of the synthetic beam on the second rotating member 3 is not greater than 20°; when the light is incident on the filter (including narrow-band filters 31 and red, green, and blue color filters, etc.) at an incident angle less than 20°, all the filtered light rays at this time conform to the nominal value of the filter. For example, for a 450-nanometer filter, when the light is incident on the filter at an aperture angle of 20°, the light rays received by the 450-nanometer filter are in the range of -20° to 20°. At this time, the filtered light rays are all around 450 nanometers, and differences can be avoided, and the filtering effect of the filter will not change. By setting the second optical device 6, the synthetic light is guided into parallel light, and the beam realizes nearly parallel transmission, with a parallelism less than 10°. The third rotating member 4 is located on the parallel beam transmission optical path, and finally, the second focusing is performed through the third optical device 7, and the beam converges to the light guiding device 200, with an aperture angle less than 40° and a spot size less than 3 mm in diameter.

[0087] In a specific embodiment, the first optical device 5 is a first focusing lens, the second optical device 6 is a second focusing lens, and the third optical device 7 is a third focusing lens.

[0088] Specifically, as Figure 4 shown, the first rotating member 2 is in the shape of a turntable. At least one fan-shaped first empty hole 21 is formed on the first rotating member 2, and the remaining part of the first rotating member 2 forms a disk surface 22. Of course, a plurality of first empty holes 21 may also be formed on the first rotating member 2, and the plurality of first empty holes 21 are arranged at equal angular intervals along the circumferential direction of the first rotating member 2.

[0089] In a specific embodiment, the first rotating member 2 is a butterfly wheel. The fan-shaped angle of the first empty hole 21 of the first rotating member 2 is 120°. The butterfly wheel adopts a structure with a fan-shaped angle of the empty hole of 120°, which can meet the exposure timing with a duty cycle of 1:2. The duty cycle is the ratio of the time when the first empty hole 21 is located in the light-emitting optical path of the light source assembly 1 to the time when the disk surface 22 is located in the light-emitting optical path of the light source assembly 1 when the first rotating member 2 rotates; the angular velocity of the rotation of the first rotating member 2 corresponds to the frame rate of the image sensor for shooting and exposure.

[0090] Optionally, as Figure 5 shown, the first rotating member 2 includes two rotating baffles 23 that are overlapped at the center. A fan-shaped opening 24 is formed on the rotating baffle 23 around the center. The overlapping part of the fan-shaped openings 24 of the two rotating baffles 23 forms the first empty hole 21, and the remaining parts of the two rotating baffles 23 form the disk surface 22. The two rotating baffles 23 can also rotate relative to each other around an axis perpendicular to the center of the rotating baffle 23 to adjust the size of the overlapping part of the fan-shaped openings 24 of the two rotating baffles 23, and further adjust the fan-shaped angle of the first empty hole 21.

[0091] In this embodiment, the first rotating member 2 has a double-layer adjustable structure. By adjusting the overlapping position of the two rotating baffles 23, the fan-shaped angle of the first empty hole 21 can be adjusted, and further the duty cycle of the first rotating member 2 can be adjusted; by adjusting the duty cycle of the first rotating member 2, the light source device can match image sensors with different imaging frame rates, and has a wide range of applications.

[0092] Specifically, the light source device further includes a controller. The controller is electrically connected to the light source assembly 1 and the driving mechanism. The controller is used to control the light source assembly 1 to emit illumination light, and the controller is also used to control the driving mechanism to drive the first rotating member 2, the second rotating member 3, and the third rotating member 4 to rotate respectively to control the illumination mode of the light source device.

[0093] Among them, the light source device at least includes a hyperspectral illumination mode.

[0094] When paired with a black-and-white sensor or a color sensor with progressive exposure, in the hyperspectral illumination mode, the controller controls the drive mechanism to drive the first rotating member 2 and the second rotating member 3 to rotate respectively, and the third rotating member 4 stops at the position where the third empty hole 44 is in the light output optical path of the light source assembly 1, suitable for providing hyperspectral illumination for the black-and-white sensor or the color sensor.

[0095] As Figure 6 shown, it is a timing diagram when the light source device works in the hyperspectral illumination mode when paired with a black-and-white sensor or a color sensor with progressive exposure. Figure 6 The first horizontal row in it represents the timing diagram when the first rotating member 2 is in the light output optical path of the light source assembly 1, the second horizontal row represents the timing diagram when the second rotating member 3 is in the light output optical path of the light source assembly 1, and the third horizontal row represents the timing diagram when the third rotating member 4 is in the light output optical path of the light source assembly 1. It can be seen that in the hyperspectral illumination mode, the first rotating member 2 rotates at a constant angular velocity, so that the first empty hole 21 and the disk surface 22 are alternately located in the light output optical path of the light source assembly 1; the second rotating member 3 rotates to drive each narrowband filter 31 (such as narrowband filter one, narrowband filter two, narrowband filter three,...) to be successively located in the light output optical path of the light source assembly 1; the third rotating member 4 stops at the position where the third empty hole 44 is in the light output optical path of the light source assembly 1; and the rotation angular velocities of the first rotating member 2 and the second rotating member 3 match the imaging frame rate of the image sensor, so that the image sensor is exposed when each narrowband filter 31 and the first empty hole 21 are simultaneously located in the light output optical path of the light source assembly 1, so that each narrowband filter 31 images one frame, realizing the output of the hyperspectral image.

[0096] In addition, the existing hyperspectral endoscope light source device can only provide hyperspectral illumination. If it is necessary to be compatible with ordinary light illumination and special light illumination, the optical path needs to be additionally re-transformed, the structure is relatively complex, and the use cost is increased. Among them, special light illumination refers to providing illumination light in a special wavelength band. For example, using two wavelengths of light (blue light: 400 - 440 nm / green light: 520 - 560 nm) that are easily absorbed by hemoglobin to irradiate and image, so that the capillaries on the surface layer of the mucosa and the fine structure of the mucosa can be emphasized, which can provide strong help for the early detection of cancer. Utilizing the induced fluorescence characteristics of tissues, using blue light (390 - 470 nm) excitation light to irradiate the submucosa, so that the tissue produces strong fluorescence, emphasizing the subtle differences between normal mucosa and lesions, providing a basis for diagnosing the pathological changes of tissues.

[0097] Optionally, as Figure 7 shown, the second rotating member 3 further includes a first infrared filter 32 and a first special light filter 33, and the first infrared filter 32, the first special light filter 33 and multiple narrowband filters 31 are linearly arranged around the rotation axis of the second rotating member 3.

[0098] The second rotating member 3 can achieve the function of ordinary white light illumination by setting the first infrared filter 32, and can achieve the function of special light illumination emitting special band illumination light by setting the first special light filter 33; through the cooperation of the three rotating members, multiple illumination modes can be achieved simultaneously, including at least the ordinary light illumination mode, the special light illumination mode, the hyperspectral illumination mode, etc., without the need for additional reconfiguration of the optical path, with a simple structure, convenient and flexible use, wide application range, and meeting the user's needs.

[0099] In this embodiment, the light source device further includes an ordinary light illumination mode and a special light illumination mode.

[0100] When paired with a black-and-white sensor with progressive exposure, in the ordinary light illumination mode, the first rotating member 2 rotates, the second rotating member 3 stops at the position where the first infrared filter 32 is located in the light output optical path of the light source assembly 1, and the third rotating member 4 rotates, suitable for providing ordinary light illumination for the black-and-white sensor. In the special light illumination mode, the first rotating member 2 rotates, the second rotating member 3 stops at the position where the first special light filter 33 is located in the light output optical path of the light source assembly 1, and the third rotating member 4 rotates, suitable for providing special light illumination for the black-and-white sensor.

[0101] When paired with a color sensor with progressive exposure, in the ordinary light illumination mode, the first rotating member 2 rotates, the second rotating member 3 stops at the position where the first infrared filter 32 is located in the light output optical path of the light source assembly 1, and the third rotating member 4 stops at the position where the third empty hole 44 is located in the light output optical path of the light source assembly 1, suitable for providing ordinary light illumination for the color sensor. In the special light illumination mode, the first rotating member 2 rotates, the second rotating member 3 stops at the position where the first special light filter 33 is located in the light output optical path of the light source assembly 1, and the third rotating member 4 stops at the position where the third empty hole 44 is located in the light output optical path of the light source assembly 1, suitable for providing special light illumination for the color sensor.

[0102] Specifically, the sector angles of the red filter 41, the green filter 42, the blue filter 43 of the third rotating member 4 and the third empty hole 44 satisfy the following inequality group:

[0103] x1≥a×w2 / w1;

[0104] x2≥a×w2 / w1;

[0105] x3≥a×w2 / w1;

[0106] x4≥0°;

[0107] y + z≥0°;

[0108] x1 + 2y + z≤120°;

[0109] x1 + x2 + 2y + z ≥ 120° + a × w2 / w1;

[0110] x1 + x2 + 4y + 2z ≤ 180°;

[0111] x1 + x2 + x3 + 4y + 2z ≥ 240° + a × w2 / w1;

[0112] x1 + x2 + x3 + x4 + 8y + 4z = 360°;

[0113] x1 ≥ a × w3 / w1;

[0114] x3 ≥ a × w3 / w1;

[0115] x1 + x2 + x3 + 4y + 2z ≥ 180° + a × w3 / w1.

[0116] Wherein, w1 is the rotational angular velocity of the first rotating member 2, w2 is the rotational angular velocity of the third rotating member 4 in the normal light illumination mode, w3 is the rotational angular velocity of the third rotating member 4 in the special light illumination mode, a is the sector angle of the first empty hole 21, y is the circular tangent angle of the light spot on the third rotating member 4, y + z is the sector angle corresponding to the interval on the third rotating member 4, x1 + y is the sector angle of the red filter 41, x2 + y is the sector angle of the green filter 42, x3 + y is the sector angle of the blue filter 43, and x4 + y is the sector angle of the third empty hole 44.

[0117] The interval on the third rotating member 4 refers to the spacer bracket provided between any two of the red filter 41, the green filter 42, the blue filter 43 and the third empty hole 44. Setting the spacer bracket is beneficial to enhancing the structural strength of the third rotating member 4; for example, a metal spacer bracket. Of course, the red filter 41, the green filter 42 and the blue filter 43 can also be seamlessly connected, in which case y + z = 0. By setting the sector angles of the red filter 41, the green filter 42, the blue filter 43 and the third empty hole 44 of the third rotating member 4 to satisfy the above inequality group, a frame-drop-free image output can be achieved.

[0118] Specifically, as Figure 8 shown, it is the timing diagram when the light source device works in the normal light illumination mode for matching with a line-by-line exposure black-and-white sensor. Figure 8The first horizontal row in [Figure] shows the timing diagram of the first rotating member 2 in the light-emitting optical path of the light source assembly 1. The second horizontal row shows the timing diagram of the second rotating member 3 in the light-emitting optical path of the light source assembly 1. The third horizontal row shows the timing diagram of the third rotating member 4 in the light-emitting optical path of the light source assembly 1. It can be seen that in the normal light illumination mode, the first rotating member 2 rotates at an angular velocity of w1, causing the first empty hole 21 and the disk surface 22 to alternately be in the light-emitting optical path of the light source assembly 1. The second rotating member 3 stops at the position where the first infrared filter 32 with a grid is in the light-emitting optical path of the light source assembly 1. The rotational angular velocity w2 of the third rotating member 4 rotates at 1 / 3 of the rotational angular velocity w1 of the first rotating member 2, that is, w2 = 1 / 3w1. Since the sector angles of the red filter 41, green filter 42, blue filter 43, and the third empty hole 44 of the third rotating member 4 satisfy the above inequality group, when a certain initial phase is matched, the third empty hole 44 of the third rotating member 4 can always correspond to the position of the disk surface 22 of the first rotating member 2. Thus, the third rotating member 4 can filter out the third empty hole 44 and achieve the output of red, green, and blue color images without frame drops. The black-and-white sensor uses time-division imaging technology to obtain a color image and achieve the output of a color image.

[0119] As Figure 9 shown, it is the timing diagram when the light source device operates in the normal light illumination mode when paired with a color sensor with progressive exposure. Figure 9 The first horizontal row in [Figure] shows the timing diagram of the first rotating member 2 in the light-emitting optical path of the light source assembly 1. The second horizontal row shows the timing diagram of the second rotating member 3 in the light-emitting optical path of the light source assembly 1. The third horizontal row shows the timing diagram of the third rotating member 4 in the light-emitting optical path of the light source assembly 1. It can be seen that in the normal light illumination mode, the first rotating member 2 rotates at an angular velocity of w1, causing the first empty hole 21 and the disk surface 22 to alternately be in the light-emitting optical path of the light source assembly 1. The second rotating member 3 stops at the position where the first infrared filter 32 with a grid is in the light-emitting optical path of the light source assembly 1. The third rotating member 4 stops at the position where the third empty hole 44 area is in the light-emitting optical path of the light source assembly 1. The color sensor uses real-time imaging technology to output a color image in real time.

[0120] As Figure 10As shown in the figure, it is the transmission spectrum diagram of the red filter 41, green filter 42, and blue filter 43 of the third rotating member 4, and the first special light filter 33 of the second rotating member 3. Among them, the horizontal axis is the wavelength of light, and the vertical axis is the transmittance. It can be seen that the first special light filter 33 can only transmit illumination light within two wavelength ranges of 420 - 450 nm and 530 - 560 nm, and the transmittance in other wavelength ranges is close to 0. Therefore, after the second rotating member 3 and the third rotating member 4 are combined, when the red filter 41 overlaps with the first special light filter 33, since the transmittance of the first special light filter 33 is 0, no illumination light is emitted, and a black image will appear at this time; when the green filter 42 overlaps with the first special light filter 33, since the transmission spectrum range of the first special light filter 33 in the green spectral band is smaller than that of the green filter 42, the green transmitted light corresponding to the special spectral band is filtered out by the combination of the two; similarly, when the blue filter 43 overlaps with the first special light filter 33, since the transmission spectrum range of the first special light filter 33 in the blue spectral band is smaller than that of the blue filter 43, the blue transmitted light corresponding to the special spectral band is filtered out by the combination of the two.

[0121] As Figure 11 shown, it is the timing diagram when the light source device operates in the special light illumination mode when paired with a black-and-white sensor with progressive exposure. Figure 11 The first horizontal row in the figure represents the timing diagram when the first rotating member 2 is in the light output optical path of the light source assembly 1, the second horizontal row represents the timing diagram when the second rotating member 3 is in the light output optical path of the light source assembly 1, and the third horizontal row represents the timing diagram when the third rotating member 4 is in the light output optical path of the light source assembly 1. It can be seen that in the special light illumination mode, the first rotating member 2 rotates at an angular velocity of w1, causing the first empty hole 21 and the disk surface 22 to alternately be in the light output optical path of the light source assembly 1; the second rotating member 3 stops at the position where the first special light filter 33 is in the light output optical path of the light source assembly 1; the rotational angular velocity w3 of the third rotating member 4 rotates at 1 / 2 of the rotational angular velocity w1 of the first rotating member 2, that is, w3 = 1 / 2w1. Since the fan angles of the red filter 41, green filter 42, blue filter 43, and the third empty hole 44 of the third rotating member 4 satisfy the above inequality group, when a certain initial phase is paired, it can make the third empty hole 44 and the red filter 41 of the third rotating member 4 always correspond to the position of the disk surface 22 of the first rotating member 2, so that the third empty hole 44 and the red filter 41 can be filtered out; at the same time, the first special light filter 33 alternately cooperates with the blue filter 43 and the green filter 42, and finally alternately outputs a non-drop-frame image of blue light and green light in the special spectral band.

[0122] As Figure 12 shown, it is the timing diagram when the light source device operates in the special light illumination mode when paired with a color sensor with progressive exposure.Figure 12 The first horizontal row represents the timing diagram of the first rotating member 2 in the light-emitting optical path of the light source assembly 1, the second horizontal row represents the timing diagram of the second rotating member 3 in the light-emitting optical path of the light source assembly 1, and the third horizontal row represents the timing diagram of the third rotating member 4 in the light-emitting optical path of the light source assembly 1. It can be seen that in the special light illumination mode, the first rotating member 2 rotates at an angular velocity of w1, so that the first empty hole 21 and the disk surface 22 are alternately located in the light-emitting optical path of the light source assembly 1; the second rotating member 3 stops at the position where the first special light filter 33 is located in the light-emitting optical path of the light source assembly 1; the third rotating member 4 stops at the position where the third empty hole 44 area is located in the light-emitting optical path of the light source assembly 1.

[0123] In this embodiment, the light source device further includes a dual-light mode. The dual-light mode means that the normal light illumination mode of emitting white light and the special light illumination mode appear alternately.

[0124] As Figure 13 shown, it is the timing diagram when the light source device works in the dual-light mode when matching with a black sensor for line-by-line exposure. Figure 13The first horizontal row represents the timing diagram of the first rotating member 2 in the light-emitting optical path of the light source assembly 1, the second horizontal row represents the timing diagram of the second rotating member 3 in the light-emitting optical path of the light source assembly 1, and the third horizontal row represents the timing diagram of the third rotating member 4 in the light-emitting optical path of the light source assembly 1. It can be seen that in the dual-light mode, at this time, the first rotating member 2 rotates at an angular velocity of w1, so that the first empty hole 21 and the disk surface 22 are alternately located in the light-emitting optical path of the light source assembly 1; the second rotating member 3 switches back and forth between the positions where the first infrared filter 32 and the first special light filter 33 are located in the light-emitting optical path of the light source assembly 1; the rotational angular velocity w2 of the third rotating member 4 rotates at 1 / 3 of the rotational angular velocity w1 of the first rotating member 2. At this time, after matching a certain initial phase, due to the design of the red filter 41, green filter 42, blue filter 43 and the sector angle of the third empty hole 44 of the third rotating member 4 according to the above inequality group, the third empty hole 44 of the third rotating member 4 can always correspond to the position of the disk surface 22 of the first rotating member 2, so that the third empty hole 44 will be filtered out; when the second rotating member 3 switches to the first infrared filter 32, the third rotating member 4 rotates at 1 / 3w1, and outputs three frames of red, green, and blue images; when the second rotating member 3 switches to the first special light filter 33, the third rotating member 4 still rotates at 1 / 3w1. When the first special light filter 33 overlaps with the red filter 41, a black image is output. When it overlaps with the green filter 42, a green image in a special spectral band is output. When it overlaps with the blue filter 43, a blue image in a special spectral band is output. Thus, a red image, a green image, a blue image, a black image, a green image in a special spectral band, and a blue image in a special spectral band will be output in sequence. Finally, during image processing, three frames of red, green, and blue images are taken to synthesize an image in the normal light illumination mode, and two frames of images of green in the special spectral band and blue in the special spectral band are taken to synthesize an image in the special light illumination mode, thereby realizing the dual-light mode.

[0125] When paired with a color sensor with progressive exposure, in the dual-light mode, at this time, the first rotating member 2 rotates at an angular velocity of w1, so that the first empty hole 21 and the disk surface 22 are alternately located in the light-emitting optical path of the light source assembly 1; the second rotating member 3 switches back and forth between the positions where the first infrared filter 32 and the first special light filter 33 are located in the light-emitting optical path of the light source assembly 1; the third rotating member 4 stops at the position where the third empty hole 44 is located in the light-emitting optical path of the light source assembly 1.

[0126] Optionally, as Figure 7 shown, the second rotating member 3 further includes a second empty hole 34, and the second empty hole 34, the first infrared filter 32, the first special light filter 33 and a plurality of narrow-band filters 31 are linearly arranged around the rotation axis of the second rotating member 3. As Figure 14As shown, the third rotating member 4 includes an inner layer and an outer layer distributed radially. The red filter 41, the green filter 42, the blue filter 43 and the third empty hole 44 are arranged on the outer layer. The third rotating member 4 further includes a second infrared filter 45 and a second special light filter 46 that surround its rotation axis and are arranged on the inner layer. The third rotating member 4 can also move in a direction perpendicular to its rotation axis and drive the inner layer and the outer layer to be respectively switched into the light output optical path of the light source assembly 1.

[0127] The third rotating member 4 uses a double-layer structure. The outer layer has red, green, and blue primary color filters and the third empty hole 44, and the inner layer has the second infrared filter 45 containing a grid and the second special light filter 46. When the inner layer of the third rotating member 4 is located in the light output optical path of the light source assembly 1, the third rotating member 4 can realize the ordinary light illumination function of emitting white light by setting the second infrared filter 45, and can realize the special light illumination function of emitting special band illumination light by setting the second special light filter 46. The third rotating member 4 of this embodiment, in cooperation with the first rotating member 2 and the second rotating member 3, can simultaneously realize multiple illumination modes, at least including the ordinary light illumination mode, the special light illumination mode, the hyperspectral illumination mode, and the dual light mode, without the need for additional retransformation of the optical path, with a simple structure, convenient and flexible use, a wide range of uses, and meeting the user's usage requirements.

[0128] Specifically, the controller is further configured to control the driving mechanism to drive the third rotating member 4 to move in a direction perpendicular to its rotation axis.

[0129] In this embodiment, when paired with a black-and-white sensor or a color sensor with progressive exposure, in the hyperspectral illumination mode, the first rotating member 2 rotates, the second rotating member 3 rotates, and the third rotating member 4 stops at a position where the third empty hole 44 on the outer layer is located in the light output optical path of the light source assembly 1, suitable for providing hyperspectral illumination for the black-and-white sensor and the color sensor. The timing diagram of the light source device operating in the hyperspectral illumination mode is as Figure 6 shown.

[0130] When paired with a black-and-white sensor with progressive exposure, in the ordinary light illumination mode, the first rotating member 2 rotates, the second rotating member 3 stops at a position where the first infrared filter 32 is located in the light output optical path of the light source assembly 1, and the third rotating member 4 moves to a position where the outer layer is located in the light output optical path of the light source assembly 1 and rotates, suitable for providing ordinary light illumination for the black-and-white sensor. The timing diagram of the light source device operating in the ordinary light illumination mode is as Figure 8 shown.

[0131] In the special light illumination mode, the first rotating member 2 rotates, the second rotating member 3 stops at the position where the first special light filter 33 is in the light output optical path of the light source assembly 1, and the third rotating member 4 moves to the outer layer and is in the light output optical path of the light source assembly 1 and rotates, being suitable for providing special light illumination for the black and white sensor. The timing diagram of the light source device operating in the special light illumination mode is as shown in Figure 11 shown.

[0132] In the dual light mode, the first rotating member 2 rotates, the second rotating member 3 switches back and forth between the positions where the first special light filter 33 and the first infrared filter 32 are in the light output optical path of the light source assembly 1, and the third rotating member 4 moves to the outer layer and is in the light output optical path of the light source assembly 1 and rotates, being suitable for providing dual light illumination for the black and white sensor. The timing diagram of the light source device operating in the dual light mode is as shown in Figure 13 shown. At this time, in the dual light mode, the first rotating member 2 rotates at an angular velocity of w1, so that the first empty hole 21 and the disk surface 22 are alternately in the light output optical path of the light source assembly 1; the second rotating member 3 switches back and forth between the positions where the first infrared filter 32 with a grid and the first special light filter 33 are in the light output optical path of the light source assembly 1; the rotational angular velocity w2 of the third rotating member 4 rotates at 1 / 3 of the rotational angular velocity w1 of the first rotating member 2.

[0133] Specifically, when matching with a color sensor with progressive exposure, in the normal light illumination mode, the first rotating member 2 rotates, the second rotating member 3 stops at the position where the first infrared filter 32 is in the light output optical path of the light source assembly 1, and the third rotating member 4 stops at the position where the third empty hole 44 in the outer layer is in the light output optical path of the light source assembly 1, being suitable for providing normal light illumination for the color sensor. The timing diagram of the light source device operating in the normal light illumination mode is as shown in Figure 9 shown.

[0134] In the special light illumination mode, the first rotating member 2 rotates, the second rotating member 3 stops at the position where the first special light filter 33 is in the light output optical path of the light source assembly 1, and the third rotating member 4 stops at the position where the third empty hole 44 in the outer layer is in the light output optical path of the light source assembly 1, being suitable for providing special light illumination for the color sensor. The timing diagram of the light source device operating in the special light illumination mode is as shown in Figure 12 shown.

[0135] In the dual light mode, the first rotating member 2 rotates, the second rotating member 3 stops at the position where the second empty hole 34 is in the light output optical path of the light source assembly 1, and the third rotating member 4 moves to the inner layer and is in the light output optical path of the light source assembly 1 and rotates, being suitable for providing dual light illumination for the color sensor.

[0136] As shown in Figure 15As shown, it is a timing diagram of the light source device operating in the dual-light mode when paired with a color sensor for line-by-line exposure. Figure 15 The first row represents the timing diagram of the first rotating member 2 in the light-emitting optical path of the light source assembly 1. The second row represents the timing diagram of the second rotating member 3 in the light-emitting optical path of the light source assembly 1. The third row represents the timing diagram of the third rotating member 4 in the light-emitting optical path of the light source assembly 1. It can be seen that in the dual-light mode, the first rotating member 2 rotates at an angular velocity of w1, causing the first empty hole 21 and the disk surface 22 to alternately be in the light-emitting optical path of the light source assembly 1; the second rotating member 3 stops at the position where the second empty hole 34 is in the light-emitting optical path of the light source assembly 1; the third rotating member 4 rotates at an angular velocity of w3 in the position where the inner layer is in the light-emitting optical path of the light source assembly 1, and w3 = 1 / 2w1.

[0137] In the light source device of this embodiment, in the dual-light mode, it is not necessary for the second rotating member 3 to switch back and forth at a high frequency, and no great noise will be generated, improving the illumination imaging quality.

[0138] In a specific embodiment, the sector angles of the green filter 42 and the blue filter 43 of the third rotating member 4 are 127.333°, the sector angle of the red filter 41 is 67.333°, and the sector angle of the third empty hole 44 is 38°.

[0139] The embodiment of the present invention also provides an endoscope imaging system, including an endoscope and a light source device provided by any of the above embodiments. The endoscope is used to provide an optical path channel, and its end directly enters the tissue area to be measured in the human body. The light source device is used to provide illumination light.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A light source device, characterized in that, Comprising: A light source assembly for emitting illumination light; A first rotating member, a second rotating member, and a third rotating member disposed on the light-emitting side of the light source assembly and arranged in sequence along the light-emitting direction of the light source assembly. The rotation axes of the first rotating member, the second rotating member, and the third rotating member are all parallel to the light-emitting direction of the light source assembly; And A driving mechanism for driving the first rotating member, the second rotating member, and the third rotating member to rotate respectively; Wherein, the first rotating member includes a first empty hole and a disk surface arranged around its rotation axis. The first rotating member can rotate around its rotation axis and drive the first empty hole and the disk surface to be respectively switched into the light-emitting optical path of the light source assembly; The second rotating member includes a plurality of narrow-band filters arranged around its rotation axis. The second rotating member can rotate around its rotation axis and drive the plurality of narrow-band filters to be respectively switched into the light-emitting optical path of the light source assembly; The third rotating member includes a red filter, a green filter, a blue filter, and a third empty hole arranged around its rotation axis. The third rotating member can rotate around its rotation axis and drive the red filter, the green filter, the blue filter, and the third empty hole to be respectively switched into the light-emitting optical path of the light source assembly; The first rotating member includes two rotating baffles arranged with their centers overlapping. The rotating baffle is provided with a fan-shaped opening around the center. The overlapping part of the fan-shaped openings of the two rotating baffles forms the first empty hole, and the remaining parts of the two rotating baffles form the disk surface; the two rotating baffles can also rotate relative to each other around an axis perpendicular to the center of the rotating baffle to adjust the size of the overlapping part of the fan-shaped openings of the two rotating baffles, thereby adjusting the fan-shaped angle of the first empty hole and the duty ratio of the first rotating member. The duty ratio is the ratio of the time when the first empty hole is located in the light-emitting optical path of the light source assembly to the time when the disk surface is located in the light-emitting optical path of the light source assembly during the rotation of the first rotating member.

2. The light source device according to claim 1, wherein The light source device further includes a controller. The controller is electrically connected to the light source assembly and the driving mechanism. The controller is used to control the light source assembly to emit illumination light and control the driving mechanism to drive the first rotating member, the second rotating member, and the third rotating member to rotate respectively, so as to control the illumination mode of the light source device; The light source device includes a hyperspectral illumination mode. In the hyperspectral illumination mode, the first rotating member rotates, the second rotating member rotates, and the third rotating member stops at a position where the third empty hole is located in the light-emitting optical path of the light source assembly, suitable for providing hyperspectral illumination for a black-and-white sensor or a color sensor.

3. The light source device according to claim 2, wherein The second rotating member further includes a first infrared filter and a first special light filter. The first infrared filter, the first special light filter, and the plurality of narrow-band filters are linearly arranged around the rotation axis of the second rotating member.

4. A light source device according to claim 3, wherein the light source device further includes a normal light illumination mode and a special light illumination mode; In the normal light illumination mode, the first rotating member rotates, the second rotating member stops at a position where the first infrared filter is located in the light output optical path of the light source assembly, the third rotating member rotates, and is adapted to provide normal light illumination for the black and white sensor; or, the first rotating member rotates, the second rotating member stops at a position where the first infrared filter is located in the light output optical path of the light source assembly, the third rotating member stops at a position where the third empty hole is located in the light output optical path of the light source assembly, and is adapted to provide normal light illumination for the color sensor; In the special light illumination mode, the first rotating member rotates, the second rotating member stops at a position where the first special light filter is located in the light output optical path of the light source assembly, the third rotating member rotates, and is adapted to provide special light illumination for the black and white sensor; or, the first rotating member rotates, the second rotating member stops at a position where the first special light filter is located in the light output optical path of the light source assembly, the third rotating member stops at a position where the third empty hole is located in the light output optical path of the light source assembly, and is adapted to provide special light illumination for the color sensor.

5. A light source device according to claim 4, wherein the sector angles of the red filter, the green filter, the blue filter, and the third empty hole satisfy the following inequality group: x1≥a×w2 / w1; x2≥a×w2 / w1; x3≥a×w2 / w1; x4≥0°； y + z≥0°; x1 + 2y + z≤120°; x1 + x2 + 2y + z≥120° + a×w2 / w1; x1 + x2 + 4y + 2z≤180°; x1 + x2 + x3 + 4y + 2z≥240° + a×w2 / w1; x1 + x2 + x3 + x4 + 8y + 4z = 360°; x1≥a×w3 / w1; x3≥a×w3 / w1; x1 + x2 + x3 + 4y + 2z≥180° + a×w3 / w1; wherein, w1 is the rotation angular velocity of the first rotating member, w2 is the rotation angular velocity of the third rotating member in the normal light illumination mode, w3 is the rotation angular velocity of the third rotating member in the special light illumination mode, a is the sector angle of the first empty hole, y is the circular tangent angle of the light spot on the third rotating member, y + z is the sector angle corresponding to the interval on the third rotating member, x1 + y is the sector angle of the red filter, x2 + y is the sector angle of the green filter, x3 + y is the sector angle of the blue filter, and x4 + y is the sector angle of the third empty hole; wherein, the interval on the third rotating member refers to the interval bracket provided between any two of the red filter, the green filter, the blue filter, and the third empty hole.

6. A light source device according to claim 3, wherein The third rotating member includes an inner layer and an outer layer distributed radially. The red filter, the green filter, the blue filter, and the third empty hole are arranged on the outer layer. The third rotating member further includes a second infrared filter and a second special light filter that surround its rotation axis and are arranged on the inner layer. The third rotating member can also move in a direction perpendicular to its rotation axis and drive the inner layer and the outer layer to be respectively switched into the light-emitting optical path of the light source assembly. The second rotating member further includes a second empty hole. The second empty hole, the first infrared filter, the first special light filter, and the plurality of narrowband filters are linearly arranged around the rotation axis of the second rotating member.

7. The light source device according to claim 6, wherein The controller is further configured to control the drive mechanism to drive the third rotating member to move in a direction perpendicular to its rotation axis. The light source device further includes a normal light illumination mode, a special light illumination mode, and a dual-light mode. In the hyperspectral illumination mode, the first rotating member rotates, the second rotating member rotates, and the third rotating member stops at a position where the third empty hole in the outer layer is located in the light-emitting optical path of the light source assembly, suitable for providing hyperspectral illumination for a black-and-white sensor or a color sensor. In the normal light illumination mode, the first rotating member rotates, the second rotating member stops at a position where the first infrared filter is located in the light-emitting optical path of the light source assembly, and the third rotating member moves to a position where the outer layer is located in the light-emitting optical path of the light source assembly and rotates, suitable for providing normal light illumination for a black-and-white sensor; or, the first rotating member rotates, the second rotating member stops at a position where the first infrared filter is located in the light-emitting optical path of the light source assembly, and the third rotating member stops at a position where the third empty hole in the outer layer is located in the light-emitting optical path of the light source assembly, suitable for providing normal light illumination for a color sensor. In the special light illumination mode, the first rotating member rotates, the second rotating member stops at a position where the first special light filter is located in the light-emitting optical path of the light source assembly, and the third rotating member moves to a position where the outer layer is located in the light-emitting optical path of the light source assembly and rotates, suitable for providing special light illumination for a black-and-white sensor; or, the first rotating member rotates, the second rotating member stops at a position where the first special light filter is located in the light-emitting optical path of the light source assembly, and the third rotating member stops at a position where the third empty hole in the outer layer is located in the light-emitting optical path of the light source assembly, suitable for providing special light illumination for a color sensor. In the dual - light mode, the first rotating member rotates, and the second rotating member switches back and forth between the positions of the first special light filter and the first infrared filter in the light - emitting optical path of the light source assembly. The third rotating member moves to the outer layer in the light - emitting optical path of the light source assembly and rotates, being suitable for providing dual - light illumination for the black - and - white sensor; or, the first rotating member rotates, the second rotating member stops at the position of the second empty hole in the light - emitting optical path of the light source assembly, the third rotating member moves to the inner layer in the light - emitting optical path of the light source assembly and rotates, being suitable for providing dual - light illumination for the color sensor.

8. A light source device according to any one of claims 1 to 7, characterized in that the light source device further includes a first optical device, a second optical device, and a third optical device. The first optical device, the second optical device, and the third optical device are arranged in sequence along the light - emitting direction of the light source assembly on the light - emitting side of the light source assembly. The first optical device is used for performing a first focusing on the illumination light emitted by the light source assembly, the second optical device is used for guiding the light that has undergone the first focusing into parallel light, and the third optical device is used for performing a second focusing on the parallel light; the first rotating member is arranged between the first optical device and the second optical device, the second rotating member is arranged between the first rotating member and the second optical device, and the third rotating member is arranged between the second optical device and the third optical device.

9. An endoscopic imaging system, characterized in that, Comprising: an endoscope and a light source device according to any one of claims 1 to 8.

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