Light source device and endoscope system

Abstract

The invention provides a light source device and an endoscope system.The light source device comprises a light source assembly, a light source receiver and a light combining device, and the light source assembly comprises a first light source, a second light source and a third light source; the optical axis of the second light source and the optical axis of the third light source intersect with the optical axis of the first light source; the light combining device can rotate relative to the optical axis of the first light source so as to change the incident angles of the first light source, the second light source and the third light source which irradiate the light combining device, so that the cut-off wavelengths of output target light rays are different; the light source receiver is used for receiving the target light, and the target light is parallel to the optical axis of the first light source. The light source device can achieve the purpose of giving consideration to white light illumination, specific bandwidth illumination and other illumination.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and in particular to a light source device and an endoscope system. Background Art

[0002] In the medical field, an endoscope system including a light source device, an endoscope, and a detector is usually used for diagnosis. The endoscope captures the observation object illuminated by the light source device to obtain a captured image, and the processor device captures the image to generate an observation image for diagnosis, and the doctor diagnoses the observation object based on the observation image.

[0003] Endoscopes usually have white light imaging mode or special imaging mode. Special imaging modes such as narrow-band light imaging mode, because vascular tissue has a strong absorption of light in a specific band (415nm, 540nm), when imaging in vascular tissue, narrow-band blue light and green light are usually used for illumination, so that the endoscope has a narrow-band light imaging mode, thereby achieving the separation of superficial and deep blood vessels and tissue mucosa.

[0004] The light source device in the related art usually adopts a combination of red, green and blue three-primary color LEDs, which can only provide white light illumination for white light imaging. If a light source device is to be used for a special imaging mode, it is necessary to add a specific bandwidth illumination light source on the basis of the three-primary color LED combination, such as an LED light source of other colors or specific bandwidth. The increase in the number of light sources not only leads to a larger light source device, but also increases the manufacturing cost accordingly, and the light source device cannot achieve the purpose of taking into account both white light illumination and specific bandwidth illumination. Summary of the invention

[0005] The embodiments of the present application provide a light source device and an endoscope system, which are used to enable the light source device in the related art to achieve the purpose of taking into account both white light illumination and specific bandwidth illumination.

[0006] In a first aspect, an embodiment of the present application provides a light source device, comprising a light source assembly, a light source receiver and a light combining device, wherein the light source assembly comprises a first light source, a second light source and a third light source; the optical axes of the second light source and the third light source intersect with the optical axis of the first light source; the light combining device can rotate relative to the optical axis of the first light source to change the incident angles of the first light source, the second light source and the third light source irradiated on the light combining device, so that the cutoff wavelengths of the output target light are different; the light source receiver is used to receive the target light, and the target light is parallel to the optical axis of the first light source.

[0007] The beneficial effect of the light source device provided in the embodiment of the present application is that: a light source assembly including three light sources is adopted, so that the first light source, the second light source and the third light source are irradiated toward the light combining device in different directions. At the same time, the light combining device can rotate relative to the optical axis of the first light source, so as to change the incident angles of the first light source, the second light source and the third light source on the light combining device, so that after the light passes through the light combining device, target light with different cutoff wavelengths parallel to the optical axis of the first light source is formed, and the target light is output after passing through the light source receiver, thereby realizing white light illumination or other illumination.

[0008] In some embodiments, the light combining device includes: a long-wave dichroic mirror and a short-wave dichroic mirror, the long-wave dichroic mirror having a first light-entering surface and a first reflecting surface, the first light-entering surface facing the first light source, the first reflecting surface facing the second light source, the long-wave dichroic mirror can rotate relative to the optical axis of the first light source to change the incident angle of the first light source and the incident angle of the second light source irradiated on the long-wave dichroic mirror; the short-wave dichroic mirror has a second light-entering surface and a second reflecting surface, the second light-entering surface facing the first light source, the second reflecting surface facing the third light source, the short-wave dichroic mirror can rotate relative to the optical axis of the first light source to change the incident angle of the first light source and the incident angle of the third light source irradiated on the short-wave dichroic mirror.

[0009] Through the above arrangement, the light source device can achieve the purpose of taking into account white light illumination and other illumination such as narrow-band light.

[0010] In some embodiments, the long-pass dichroic mirror is located between the first light source and the light source receiver, and the short-pass dichroic mirror is located between the first light source and the light source receiver.

[0011] Through the above arrangement, the wavelength of the first light source in a wider wavelength range is filtered to obtain the light in a smaller wavelength range, which is beneficial to improving the effect of narrow-band lighting.

[0012] In some embodiments, the short-wave pass dichroic mirror is located between the long-wave pass dichroic mirror and the light source receiver.

[0013] Through the above arrangement, the white light lighting effect is improved.

[0014] In some embodiments, the long-wave pass dichroic mirror rotates in an opposite direction to the short-wave pass dichroic mirror.

[0015] The above arrangement is advantageous in making the wavelength range of the target light wider.

[0016] In some embodiments, the rotation angle range of the long-wave pass dichroic mirror is 0 to 60°.

[0017] With the above settings, it is not conducive to white light illumination.

[0018] In some embodiments, the rotation angle range of the short-wave pass dichroic mirror is 0 to 60°.

[0019] With the above settings, it is not conducive to white light illumination.

[0020] In some embodiments, the main wavelength range of the first light source is 500 nm to 570 nm, and the full width at half maximum is greater than or equal to 100 nm.

[0021] With the above settings, not only is the wavelength range of the light emitted by the first light source after passing through the light combining device expanded, so that the wavelength range of the first light source overlaps with the wavelength range of the second light source, improving the effect of white light imaging, but also when the light emitted by the second light source is less, the light emitted by the first light source can compensate for the light in the overlapping band in the optical path, thereby increasing the diversity of illumination.

[0022] In some embodiments, the main wavelength range of the second light source is 440 nm to 500 nm, and the full width at half maximum range is 20 nm to 40 nm.

[0023] With the above settings, the diversity of illumination is further increased.

[0024] In some embodiments, the main wavelength range of the third light source is 570 nm to 650 nm, and the full width at half maximum range is 20 nm to 40 nm.

[0025] With the above settings, the diversity of illumination is further increased.

[0026] In some embodiments, the second light source can rotate to change the incident angle of the second light source on the long-wave pass dichroic mirror, so that the second light source after being reflected by the second reflection surface is parallel to the optical axis of the first light source.

[0027] With the above settings, the efficiency of the light emitted by the second light source entering the light source receiver is improved.

[0028] In some embodiments, the third light source can rotate to change the incident angle of the third light source on the short-wave pass dichroic mirror, so that the third light source after being reflected by the second reflection surface is parallel to the optical axis of the first light source.

[0029] With the above settings, the efficiency of the light emitted by the third light source entering the light source receiver is improved.

[0030] In a second aspect, an embodiment of the present application further provides an endoscope system, including the light source device described in the first aspect above and an endoscope, and the light source device is used to provide an illumination light source for the endoscope.

[0031] The endoscope system in the embodiments of the present application has the same technical effects as the light source device in the first aspect, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0033] Figure 1 Structural schematic diagram of the light source device according to the first embodiment of the present application;

[0034] Figure 2 Structural schematic diagram of the light combining device in the first embodiment and the corresponding target light rays;

[0035] Figure 3 Structural schematic diagram of the light source device according to the second embodiment and the corresponding target light rays;

[0036] Figure 4 Structural schematic diagram of the light source device according to the third embodiment and the corresponding target light rays;

[0037] Figure 5 Structural schematic diagram of the light combining device in the light source device according to the fourth embodiment and the corresponding target light rays.

[0038] Among them, the reference numerals in the drawings are as follows:

[0039] 1, first light source; 10, first optical axis; 2, second light source; 3, third light source; 4, lens; 5, long-pass dichroic mirror; 501, first position of the long-pass dichroic mirror; 502, second position of the long-pass dichroic mirror; 503, third position of the long-pass dichroic mirror; 504, fourth position of the long-pass dichroic mirror; 505, fifth position of the long-pass dichroic mirror; 506, sixth position of the long-pass dichroic mirror; 6, short-pass dichroic mirror; 601, first position of the short-pass dichroic mirror; 602, second position of the short-pass dichroic mirror; 603, third position of the short-pass dichroic mirror; 604, fourth position of the short-pass dichroic mirror; 605, fifth position of the short-pass dichroic mirror; 606, sixth position of the short-pass dichroic mirror; 7, light source receiver. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0040] For the convenience of understanding, the following will first explain and describe the English abbreviations and relevant technical terms involved in the embodiments of the present application.

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0042] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0043] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0044] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0045] In the medical field, an endoscope system including a light source device, an endoscope and a processor is usually used for diagnosis. The endoscope captures a captured image of the observation object irradiated by the light source device, and the processor device generates an observation image for diagnosis based on the captured image. A doctor diagnoses the observation object according to the observation image.

[0046] An endoscope usually has a white light imaging mode or a special imaging mode. The special imaging mode is, for example, a narrow band light imaging mode. Since vascular tissues have strong absorption of light in specific wavelength bands (415 nm, 540 nm), when imaging within vascular tissues, narrow band blue light and green light are usually used for illumination, so that the endoscope has a narrow band light imaging mode, thereby realizing the separation of superficial and deep blood vessels from tissue mucosa respectively.

[0047] The light source device in the related art usually adopts a combination of red, green and blue three-primary color LEDs, which can only provide white light illumination for white light imaging. If a light source device is to be used for a special imaging mode, it is necessary to add a specific bandwidth illumination light source on the basis of the three-primary color LED combination, such as an LED light source of other colors or specific bandwidth. The increase in the number of light sources not only leads to a larger light source device, but also increases the manufacturing cost accordingly, and the light source device cannot achieve the purpose of taking into account both white light illumination and specific bandwidth illumination.

[0048] In order to solve the above problems, the embodiment of the present application adopts three light sources, and a light combining device is arranged between one of the light sources and the light source receiver. The first light source, the second light source and the third light source are irradiated toward the light combining device in different directions. At the same time, the light combining device can rotate relative to the optical axis of the light source opposite to the light source receiver. The light emitted by the light source assembly forms different target lights after passing through the light combining device, thereby realizing white light illumination or other illumination.

[0049] like Figure 1 and Figure 2 As shown, an embodiment of the present application provides a light source device, including a light source assembly, a light source receiver 7 and a light combining device, the light source assembly including a first light source 1, a second light source 2 and a third light source 3; the optical axes of the second light source 2 and the third light source 3 intersect with the optical axis of the first light source 1; that is, the optical axis of the second light source 2 intersects with the optical axis of the first light source 1, and the optical axis of the third light source 3 intersects with the optical axis of the first light source 1; the light combining device can rotate relative to the optical axis of the first light source 1 to change the incident angles of the first light source 1, the second light source 2 and the third light source 3 irradiated on the light combining device, so that the cutoff wavelengths of the output target light are different; the light source receiver 7 is used to receive the target light, and the target light is parallel to the optical axis of the first light source.

[0050] For the sake of clarity, the optical axis of the first light source 1 is referred to as the first optical axis 10. The optical axes of the second light source 2 and the third light source 3 intersect with the optical axis of the first light source 1, which means that the optical axis of the second light source 2 intersects with the first optical axis 10, and the optical axis of the third light source 3 intersects with the first optical axis 10.

[0051] The light source receiver 7 is mainly used as an optical component for receiving target light and coupling and transmitting the target light. The light source receiver 7 may be an optical fiber bundle or other optical components for receiving and transmitting light.

[0052] The above-mentioned light source component refers to a component that can emit white light, that is, can provide a light source for white light imaging.

[0053] The beneficial effects of the light source device provided by the embodiments of the present application are as follows: Through the above settings, the first light source 1, the second light source 2, and the third light source 3 irradiate the light combining device in different directions. At the same time, the light combining device can rotate relative to the optical axis of the first light source 1, changing the incident angles of the first light source, the second light source, and the third light source on the light combining device, so that the light forms target light rays with different cut-off wavelengths parallel to the optical axis of the first light source 1 after passing through the light combining device. The target light rays are output after passing through the light source receiver 7, thereby realizing white light illumination or other illuminations.

[0054] In some embodiments, the main wavelength range of the first light source 1 is 500 nm to 570 nm, and the full width at half maximum is greater than or equal to 100 nm.

[0055] Generally, the wavelength range of green light is 490 nm to 580 nm. By designing the wavelength of the first light source 1 within the above range, the first light source 1 mainly emits green light and has a relatively wide wavelength range, which can not only cover the wavelength range of green light, but also cover part of blue light, yellow light, etc. That is to say, the light actually emitted by the first light source 1 not only includes green light, but also actually covers part of blue light, yellow light, etc. In this way, the first light source 1 after passing through the light combining device can still maintain a relatively wide wavelength range. For example, the wavelength of the first light source 1 after passing through the light combining device covers part of the blue light wavelength. When the blue light emitted by the second light source 2 is less, it can compensate for the blue light in the optical path, thereby increasing the diversity of illumination.

[0056] For example, when the main wavelength range of the light emitted by the first light source 1 is 500 nm to 570 nm and the full width at half maximum is 100 nm, the wavelength range of the light emitted by the first light source 1 is 400 nm to 670 nm. In this case, the light actually emitted by the first light source 1 not only includes green light, but also actually covers part of blue light from 450 nm to 490 nm, yellow light from 580 nm to 600 nm, and orange light from 600 nm to 620 nm.

[0057] The above-mentioned first light source 1 can be a green LED capable of emitting light within the above wavelength range. The user can adjust the parameters of the green LED so that the first light source 1 can emit the above wavelength.

[0058] In some embodiments, the main wavelength range of the second light source 2 is 440 nm to 500 nm, and the full width at half maximum range is 20 nm to 40 nm.

[0059] Generally, the wavelength range of blue light is 400nm - 450nm. By designing the wavelength of the second light source 2 within the above range, the second light source 2 mainly emits blue light and has a relatively wide wavelength range, which can not only cover the wavelength range of green light, but also cover part of cyan light and green light, etc. That is to say, actually the light emitted by the second light source 2 not only includes blue light, but also actually covers part of green light, etc., making the wavelength range of the second light source 2 partially overlap with that of the first light source 1. Thus, it is not only beneficial for white light illumination, but also further increases the diversity of illumination.

[0060] The above-mentioned second light source 2 can be a blue LED capable of emitting light within the above wavelength range. Users can adjust the parameters of the blue LED so that the second light source 2 can emit the above wavelength.

[0061] In some embodiments, the main wavelength range of the third light source 3 is 570nm - 650nm, and the full width at half maximum range is 20nm - 40nm.

[0062] Generally, the wavelength range of red light is 620nm - 760nm. By designing the wavelength of the third light source 3 within the above range, the third light source 3 mainly emits red light and has a relatively wide wavelength range, which can not only cover the wavelength range of red light, but also cover part of orange light and yellow light, etc. That is to say, actually the light emitted by the third light source 3 not only includes red light, but also actually covers part of orange light, yellow light, etc., making the wavelength range of the third light source 3 partially overlap with that of the first light source 1. Thus, it is not only beneficial for white light illumination, but also further increases the diversity of illumination.

[0063] The above-mentioned third light source 3 can be a red LED capable of emitting light within the above wavelength range. Users can adjust the parameters of the red LED so that the third light source 3 can emit the above wavelength.

[0064] In summary, the first light source 1 is a green LED, the second light source 2 is a blue LED, and the third light source 3 is a red LED. The first light source 1, the second light source 2, and the third light source 3 form a trichromatic light source capable of emitting white light through the above design. In this way, not only can the light source assembly emit white light, but also special illumination within a specific wavelength range can be achieved.

[0065] Of course, the wavelength ranges of the first light source 1, the second light source 2, and the third light source 3 can be interchanged, and no specific limitation is made here.

[0066] For a clear description of the following, the light source assembly is described by taking the first light source 1 as a green LED capable of emitting light within the above wavelength range, the second light source 2 as a blue LED capable of emitting light within the above wavelength range, and the third light source 3 as a red LED capable of emitting light within the above wavelength range as an example.

[0067] In some embodiments, a lens 4 is provided on the light-emitting sides of the first light source 1, the second light source 2, and the third light source 3. In this way, the green light emitted by the first light source 1, the blue light emitted by the second light source 2, and the red light emitted by the third light source 3 are parallelly irradiated onto the light combining device.

[0068] In some embodiments, the light combining device includes a long-pass dichroic mirror 5 and a short-pass dichroic mirror 6. The long-pass dichroic mirror 5 has a first light incident surface and a first reflection surface. The first light incident surface faces the first light source 1, and the first reflection surface faces the second light source 2. The long-pass dichroic mirror 5 can rotate relative to the first optical axis 10 to change the incident angles of the first light source 1 and the second light source 2 irradiated onto the long-pass dichroic mirror 5. The short-pass dichroic mirror 6 has a second light incident surface and a second reflection surface. The second light incident surface faces the first light source 1, and the second reflection surface faces the third light source 3. The short-pass dichroic mirror 6 can rotate relative to the first optical axis 10 to change the incident angles of the first light source 1 and the third light source 3 irradiated onto the short-pass dichroic mirror 6.

[0069] Among them, the dichroic mirror is also called a dichroic mirror (Dichroic Mirrors). It almost completely transmits light of a certain wavelength and almost completely reflects light of other wavelengths. That is to say, it separates the light source into a specific spectrum. Dichroic mirrors are commonly used in laser technology. When the dichroic mirror rotates, the cut-off wavelength of the incident transmitted light will change accordingly with the change of the incident light angle; for the incident reflected light, its cut-off wavelength remains constant. That is to say, when the dichroic mirror rotates relatively, the cut-off wavelength of the target light after passing through the light combining device changes.

[0070] The above-mentioned long-pass dichroic mirror 5 is also called a long-pass filter (Long pass filter). It means that in a specific wavelength range, the long-wave direction is transmitted, and the short-wave direction is blocked, playing the role of isolating short waves and passing long waves. That is to say, light with a wavelength greater than the cut-off wavelength will pass through the long-pass dichroic mirror 5, while light with a wavelength less than the cut-off wavelength will not be able to pass through the long-pass dichroic mirror 5 and will not enter the optical path.

[0071] The above-mentioned short-pass dichroic mirror 6 is also called a short-pass filter (Short pass filter). It means that in a specific wavelength range, the short-wave direction is transmitted, and the long-wave direction is blocked, playing the role of isolating long waves and passing short waves. That is to say, light with a wavelength less than the cut-off wavelength will pass through the short-pass dichroic mirror 6, while light with a wavelength greater than the cut-off wavelength will not be able to pass through the short-pass dichroic mirror 6 and will not enter the optical path.

[0072] The above-mentioned incident angle refers to the incident light, for example, the angle between the light and the normal of the incident surface of the long-pass dichroic mirror 5 or the short-pass dichroic mirror 6.

[0073] Through the above arrangement, the light emitted by the first light source 1 obtains green light of a specific wavelength range after passing through the long-wave dichroic mirror 5 and / or the short-wave dichroic mirror 6. That is to say, the green light of a wider wavelength range can be obtained by passing through the light combining device to obtain narrow-band green light of a smaller wavelength range. In this way, not only narrow-band illumination can be achieved, which is suitable for narrow-band light imaging, but also the user can adjust the angle values ​​of the long-wave dichroic mirror 5 and the short-wave dichroic mirror 6 relative to the first optical axis 10 as needed so that the green light emitted by the first light source 1 maintains a relatively wide wavelength range, the second light source 2 is opposite to the first reflection surface of the long-wave dichroic mirror 5, and the third light source 3 is opposite to the second reflection surface of the short-wave dichroic mirror 6, and then enters the optical path together with the reflected blue light and red light, and is coupled to form white light illumination of a wider wavelength range after passing through the light source receiver 7, which is suitable for white light imaging, so that the light source device can achieve the purpose of taking into account white light illumination and other illumination such as narrow-band light.

[0074] It should be noted that the above optical path refers to the optical path between the first light source 1 and the light source receiver 7 along the first optical axis 10 .

[0075] Of course, in addition to being able to rotate relative to the first optical axis 10, the long-wave dichroic mirror 5 and the short-wave dichroic mirror 6 can also be rotated by one of them while the angle of the other is fixed, which is not specifically limited here.

[0076] like Figure 1 As shown, in some embodiments, the long-wave pass dichroic mirror 5 is located between the first light source 1 and the light source receiver 7 , and the short-wave pass dichroic mirror 6 is located between the first light source 1 and the light source receiver 7 .

[0077] Through the above arrangement, the green light emitted by the first light source 1 is transmitted twice by the long-wave dichroic mirror 5 and the short-wave dichroic mirror 6, thereby filtering the green light in a wider wavelength range to obtain narrow-band green light in a smaller wavelength range, which is beneficial to improving the effect of green light narrow-band lighting.

[0078] like Figure 1 As shown, in some embodiments, the short-wave pass dichroic mirror 6 is located between the long-wave pass dichroic mirror 5 and the light source receiver 7 .

[0079] Through the above arrangement, the green light emitted by the first light source 1 first passes through the long-wave dichroic mirror 5, and then passes through the short-wave dichroic mirror 6 to enter the light source receiver 7, while the blue light emitted by the second light source 2 first enters the light path after a large reflection by the long-wave dichroic mirror 5, and then passes through the short-wave dichroic mirror 6 to enter the light source receiver 7, thereby filtering out part of the blue light, thereby improving the white light lighting effect.

[0080] Of course, in addition to the short-pass dichroic mirror 6 being able to be located between the long-pass dichroic mirror 5 and the light source receiver 7, the positions of the short-pass dichroic mirror 6 and the long-pass dichroic mirror 5 can also be interchanged, that is, the long-pass dichroic mirror 5 is located between the short-pass dichroic mirror 6 and the light source receiver 7, and no specific limitation is made here.

[0081] As Figure 2 shown, in some embodiments, the rotation directions of the long-pass dichroic mirror 5 and the short-pass dichroic mirror 6 are opposite.

[0082] Through the above settings, the difference in the incident angle between the long-pass dichroic mirror 5 and the short-pass dichroic mirror 6 relative to the first optical axis 10 is increased, which is beneficial to making the wavelength range of the target light wider, that is, it is possible to achieve both broad-spectrum illumination and narrow-spectrum illumination.

[0083] It should be noted that narrow-spectrum illumination refers to the fact that the wavelength bandwidth of the target light is relatively narrow, and the minimum can reach a bandwidth less than 1 nm, which is applied to narrow-band imaging. Broad-spectrum imaging refers to the fact that the wavelength bandwidth of the target light is relatively wide, which is applied to broad-spectrum imaging.

[0084] Of course, in addition to the rotation directions of the long-pass dichroic mirror 5 and the short-pass dichroic mirror 6 being opposite, their rotation directions can also be the same and the speeds are different, and no specific limitation is made here.

[0085] In some embodiments, the rotation angle range of the long-pass dichroic mirror 5 is 0 to 60°.

[0086] The above rotation angle refers to the rotation range of the incident angle when the green light emitted by the first light source 1 irradiates on the long-pass dichroic mirror 5.

[0087] When the above incident angle is relatively large, it will cause less light from the blue light emitted by the second light source 2 to irradiate on the reflection surface of the short-pass dichroic mirror 6, resulting in less blue light in the target light in the optical path entering the light source receiver 7, causing an imbalance in the light distribution of the three primary colors and being not conducive to generating white light, that is, white light illumination.

[0088] It should be noted that the above optical path refers to the optical path along the first optical axis 10 between the first light source 1 and the light source receiver 7.

[0089] By making the rotation angle of the long-pass dichroic mirror 5 satisfy the above angle range, the green light, blue light and red light after passing through the long-pass dichroic mirror 5 can be well balanced, so as to achieve white light illumination and other illuminations in other wavelength ranges.

[0090] In some embodiments, the rotation angle range of the short-pass dichroic mirror 6 is 0 to 60°.

[0091] The above-mentioned rotation angle refers to the rotation range of the incident angle of the green light emitted by the first light source 1 when it irradiates on the short-wave pass dichroic mirror 6.

[0092] By making the rotation angle of the short-wave pass dichroic mirror 6 satisfy the above-mentioned angle range, the green light, blue light and red light after passing through the short-wave pass dichroic mirror 6 can be well balanced, so as to further realize white light illumination and other illuminations within other wavelength ranges.

[0093] When the above-mentioned incident angle is relatively large, it will cause less light of the red light emitted by the third light source 3 to irradiate on the reflecting surface of the short-wave pass dichroic mirror 6, resulting in less red light in the target light rays of the light path entering the light source receiver 7, leading to an unbalanced distribution of the three primary color lights and being unfavorable for generating white light, that is, white light illumination.

[0094] In some embodiments, the second light source 2 can rotate to change the incident angle of the second light source 2 when it irradiates on the long-pass dichroic mirror, so that the blue light emitted by the second light source 2 after being reflected by the second reflecting surface is parallel to the first optical axis 10.

[0095] During the rotation of the long-wave pass dichroic mirror 5 relative to the first optical axis 10, if the second light source 2 does not rotate, the incident angle of the blue light emitted by the second light source 2 when it irradiates on the long-wave pass dichroic mirror 5 will also change, that is, the outgoing light rays of the blue light after being reflected by the first reflecting surface intersect with the first optical axis 10, resulting in less blue light entering the light source receiver 7.

[0096] By changing the rotation angle of the second light source 2, more light rays of the blue light emitted by the second light source 2 can enter the light source receiver 7 after passing through the long-wave pass dichroic mirror 5, thereby improving the efficiency of the blue light emitted by the second light source 2 entering the light source receiver 7.

[0097] In some embodiments, the third light source 3 can rotate to change the incident angle of the third light source 3 when it irradiates on the long-pass dichroic mirror, so that the red light emitted by the third light source 3 after being reflected by the second reflecting surface is parallel to the first optical axis 10.

[0098] During the rotation of the short-wave pass dichroic mirror 6 relative to the first optical axis 10, if the third light source 3 does not rotate, the incident angle of the red light emitted by the third light source 3 when it irradiates on the short-wave pass dichroic mirror 6 will also change, that is, the outgoing light rays of the red light after being reflected by the second reflecting surface intersect with the first optical axis 10, resulting in less red light entering the light source receiver 7.

[0099] By changing the rotation angle of the third light source 3, more light rays of the red light emitted by the third light source 3 can enter the light source receiver 7 after passing through the short-wave pass dichroic mirror 6, thereby improving the efficiency of the red light emitted by the third light source 3 entering the light source receiver 7.

[0100] Such asFigure 1 and Figure 2 As shown in Figure 2 , in some embodiments, when the long-pass dichroic mirror 5 rotates clockwise from the first position 501 to the second position 502, the cut-off wavelength of the long-pass dichroic mirror 5 changes from the solid line 801λ 11 to the right to the double-dashed line 802λ 12 (where λ 11 < λ 12 ). That is, when the incident angle of the long-pass dichroic mirror 5 increases from small to large, its cut-off wavelength will undergo a red shift; when the short-pass dichroic mirror 6 rotates counterclockwise from the first position 601 to the second position 602, the cut-off wavelength of the short-pass dichroic mirror 6 changes from the solid line 901λ 21 to the left to the double-dashed line 902λ 22 (where λ 21 < λ 22 ), and its cut-off wavelength will undergo a blue shift.

[0101] It should be noted that Figure 2 in the abscissa is the wavelength, and the wavelength increases from left to right.

[0102] Among them, the relationship between the changes of the long-pass dichroic mirror 5 and the short-pass dichroic mirror 6 with the rotation angle θ and the offset of the wavelength λ can be obtained by calculation with the formula:

[0103]

[0104] Among them, n eff is called the effective refractive index, and has different values for different dichroic mirrors.

[0105] In some embodiments, when the light combining device is in the third position, as Figure 3 (a) shows, when the long-pass dichroic mirror 5 is in the third position 503 (the incident angle is 45°) and the short-pass dichroic mirror 6 is in the third position 603 (the incident angle is 30°), the wavelength of the green light emitted by the first light source 1 after passing through the light combining device is as Figure 3 (b) shows. The cut-off wavelength of the long-pass dichroic mirror 5 is at the solid line 803λ 13 position, and the cut-off wavelength of the short-pass dichroic mirror 6 is at the dotted line 903λ 23 position.

[0106] From Figure 3 (b), it can be seen that when the light combining device is in the position as Figure 3 (a) shows, the green light emitted by the first light source 1 will have a relatively wide spectrum after passing through the light combining device, and if it is coupled with the blue light emitted by the second light source 2 and the red light emitted by the third light source 3, wide-spectrum imaging can be achieved.

[0107] In some embodiments, when the light combining device is in the fourth position, asFigure 4 As shown in (a), when the long-pass dichroic mirror 5 is in the fourth position 504 (the incident angle is 30°), and the short-pass dichroic mirror 6 is in the fourth position 604 (the incident angle is 45°), the wavelength of the green light emitted by the first light source 1 after passing through the light combining device is as follows Figure 4 As shown in (b). The cut-off wavelength of the long-pass dichroic mirror 5 is at the solid line 804λ 14 position, and the cut-off wavelength of the short-pass dichroic mirror 6 is at the dotted line 904λ 24 position.

[0108] From Figure 4 (b), it can be seen that when the light combining device is in the position shown in Figure 4 (a), the green light emitted by the first light source 1 will have a relatively narrow spectrum after passing through the light combining device. If the blue light emitted by the second light source 2 and the red light emitted by the third light source 3 are selectively turned off, then narrow and broadband imaging can be achieved.

[0109] Compared with Figure 3 (a) and Figure 4 (a), when the light combining device rotates, that is, when the long-pass dichroic mirror 5 and the short-pass dichroic mirror 6 are in different positions, the angles of the corresponding second light source 2 and third light source 3 also change at any time, so as to ensure that the blue light emitted by the second light source 2 and the red light emitted by the third light source 3 enter the light source receiver 7 in parallel after reflection.

[0110] In some embodiments, as shown in Figure 5 (a), when the long-pass dichroic mirror 5 rotates clockwise from the fifth position 505 to the sixth position 506, and the short-pass dichroic mirror 6 rotates counterclockwise from the fifth position 605 to the sixth position 606, the cut-off wavelength of the long-pass dichroic mirror 5 moves from the solid line 805λ 15 to the right to the dotted line 806λ 16 position, that is, when the incident angle of the long-pass dichroic mirror 5 increases from small to large, its cut-off wavelength will undergo a red shift; the cut-off wavelength of the short-pass dichroic mirror 6 moves from the solid line 905λ 25 position to the right to the dotted line 906λ 26 position, and its cut-off wavelength will undergo a red shift. Among them, Figure 5 The wavelength relationship in (b): λ 15 <λ 16 <λ 25 <λ 26 .

[0111] From Figure 5 (b), it can be seen that when the long-pass dichroic mirror 5 and the short-pass dichroic mirror 6 in the light combining device rotate in the same direction, the spectral range of the output target light remains unchanged, only undergoing a red shift or a blue shift.

[0112] The feasible application scenarios of the above light source device include injecting fluorescent dyes in advance and performing labeled imaging on cancerous tissues or normal tissues during surgery. The band - pass spectral range and bandwidth can be adjusted accordingly according to the excitation wavelength and emission wavelength of the fluorescent dyes. For example, in combination with sodium fluorescein dye (excitation wavelength 465nm - 490nm, emission wavelength 510nm - 530nm), angiography of blood vessels can be performed or imaging of brain tumor tissues can be carried out; or in combination with BODIPYFL dye (excitation wavelength 488nm - 503nm, emission wavelength 511nm), Cy3 (excitation wavelength 554nm, emission wavelength 566nm), imaging of cancerous tissues can be performed, etc. Since the excitation wavelengths of different dyes vary, and the excitation wavelength and emission wavelength of each dye are close (the interval is 10nm - 20nm), it is necessary to select the corresponding excitation wavelength and bandwidth for different dyes to reduce the interference of stray light of the excitation wavelength scattered on the tissue surface on the fluorescence emission signal.

[0113] The embodiment of the present application also provides an endoscope system, including a light source device and an endoscope. The light source device is used to provide a lighting source for the endoscope.

[0114] The above - mentioned endoscope has an insertion portion inserted into the body to be examined, an operation portion provided at the proximal end portion of the insertion portion, a bending portion provided at the front - end side of the insertion portion, and a front - end portion. The bending portion is bent by operating the operation portion.

[0115] An optical lens and a photosensitive element are also provided inside the above - mentioned endoscope. The light source receiver 7 in the light source device transmits the received target light through multiplexing coupling to provide a lighting source for the endoscope, and forms an image on the photosensitive element after passing through the endoscope.

[0116] The working principle of the endoscope system is as follows: The light source device provides a light source. The light reflected by the object to be photographed generates an optical image through the optical lens and projects it onto the photosensitive surface of the photosensitive element. The photosensitive element converts the optical image into an electrical signal, that is, an analog image signal, and transmits it to the processor.

[0117] Among them, the photosensitive element (also called an image sensor) is a semiconductor chip with hundreds of thousands to millions of photodiodes on its surface. When irradiated by light, it generates electric charges. The photosensitive element can be a charge - coupled device (CCD) or a complementary metal - oxide - semiconductor device (CMOS). CCD is made of a high - sensitivity semiconductor material and can convert light into electric charges. The charge - coupled device is composed of many photosensitive units, usually in units of millions of pixels. When the surface of the photosensitive element is irradiated by light, each photosensitive unit reflects the electric charge on the component, and the signals generated by all the photosensitive units are added together to form a complete picture.

[0118] Among them, the optical lens mainly uses the refraction principle of the lens to form an image, that is, the light of the scene passes through the optical lens, forms a clear image on the focal plane, and the image of the scene is recorded by the photosensitive element located on the focal plane.

[0119] Among them, the structure and the achieved effects of the light source device are the same as those of the light source device in any of the above embodiments, and will not be described in detail here.

[0120] In the description of this specification, the specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0121] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A light source device, characterized in that, Comprising: A light source assembly, including a first light source, a second light source and a third light source; the optical axes of the second light source and the third light source intersect with the optical axis of the first light source; A light combining device capable of rotating relative to the optical axis of the first light source to change the incident angles of the first light source, the second light source and the third light source irradiated on the light combining device, so that the cut-off wavelengths of the output target light rays are different; A light source receiver for receiving the target light rays, and the target light rays are parallel to the optical axis of the first light source.

2. The light source device according to claim 1, characterized in that, The light combining device includes: A long-pass dichroic mirror having a first light incident surface and a first reflection surface, the first light incident surface faces the first light source, the first reflection surface faces the second light source, and the long-pass dichroic mirror can rotate relative to the optical axis of the first light source to change the incident angle of the first light source and the incident angle of the second light source irradiated on the long-pass dichroic mirror; A short-pass dichroic mirror having a second light incident surface and a second reflection surface, the second light incident surface faces the first light source, the second reflection surface faces the third light source, and the short-pass dichroic mirror can rotate relative to the optical axis of the first light source to change the incident angle of the first light source and the incident angle of the third light source irradiated on the short-pass dichroic mirror.

3. The light source device according to claim 2, characterized in that, The long-pass dichroic mirror is located between the first light source and the light source receiver, and the short-pass dichroic mirror is located between the first light source and the light source receiver.

4. The light source device according to claim 3, characterized in that, The short-pass dichroic mirror is located between the long-pass dichroic mirror and the light source receiver.

5. The light source device according to claim 4, characterized in that, The rotation directions of the long-pass dichroic mirror and the short-pass dichroic mirror are opposite.

6. The light source device according to claim 5, characterized in that, The rotation angle range of the long-pass dichroic mirror is 0 to 60°; And / or, the rotation angle range of the short-pass dichroic mirror is 0 to 60°.

7. The light source device according to any one of claims 2 to 6, characterized in that, The main wavelength range of the first light source is 500 nm to 570 nm, and the full width at half maximum is greater than or equal to 100 nm.

8. The light source device according to claim 7, characterized in that, The main wavelength range of the second light source is 440 nm to 500 nm, and the full width at half maximum range is 20 nm to 40 nm; And / or, the main wavelength range of the third light source is 570 nm to 650 nm, and the full width at half maximum range is 20 nm to 40 nm.

9. The light source device according to claim 8, characterized in that, The second light source can rotate to change the incident angle of the second light source irradiated on the long-pass dichroic mirror, so that the second light source reflected by the second reflection surface is parallel to the optical axis of the first light source; And / or, the third light source can rotate to change the incident angle of the third light source irradiated on the short-pass dichroic mirror, so that the third light source reflected by the second reflection surface is parallel to the optical axis of the first light source.

10. An endoscope system, characterized in that, Comprising: An endoscope, The light source device according to any one of claims 1 to 9, and the light source device is used to provide a lighting source for the endoscope.

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