Endoscope optical imaging system, endoscope imaging system, and endoscope device

Abstract

An endoscope optical imaging system disclosed by the present invention comprises an objective lens group, an internal sheath, an external sheath, an illumination optical fiber and an optical waveguide lens, the optical waveguide lens comprises a first lens body and a second lens body, the first surface of the first lens body is provided with a first transmission surface, the inclined surface is provided with a first reflection surface, and the second surface is provided with a second transmission surface; the fitting interface is provided with a first optical surface; the third surface of the second mirror body is provided with a third transmission surface; wherein the illumination light enters the first reflecting surface through the first transmission surface, is totally reflected, then enters the first optical surface, is totally reflected again and then enters the second transmission surface, and the imaging light enters the second transmission surface, is transmitted by the first optical surface and then exits from the third transmission surface to the objective lens group for imaging. By optimizing a light path, a target object can be uniformly illuminated at a short distance. The endoscope imaging system does not need to be additionally provided with an illuminating lens and omits a rod-shaped lens, so that the size of the endoscope imaging system is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to an endoscopic optical imaging system, an endoscopic imaging system, and an endoscopic device. Background Art

[0002] An endoscope is a medical device that combines optics, electronics, and mechanical technologies. It can enter the human body through natural cavities such as the oral cavity to clearly display lesions that cannot be observed by X-rays, helping doctors quickly locate the lesion sites and thus formulate more accurate treatment plans.

[0003] Currently, there are mainly two illumination methods for endoscopes: one is fiber-optic light guiding illumination, which directly illuminates the observation area by utilizing the divergence angle characteristics of optical fibers; the other is common-path illumination, in which part of the illumination light path and the imaging light path share the same path. After the illumination light irradiates the sample through the imaging system, the reflected light or the fluorescence generated by excitation of the sample is used for imaging.

[0004] For the fiber-optic illumination method, when the endoscope is close to the observed tissue, the optical fibers at the edge are difficult to effectively illuminate the central area of the tissue. Especially when the endoscope body is in contact with the tissue, the central area cannot obtain illumination at all, seriously affecting the imaging quality.

[0005] For the common-path illumination method, the illumination light is introduced into the imaging light path through a beam splitter. However, to achieve uniform illumination, it is still necessary to add an illumination lens system between the illumination optical fiber and the beam splitter, which significantly increases the volume of the side-end structure and is not conducive to the miniaturization design of the endoscope. At the same time, a rod lens is also required to transmit the image in the endoscope, and the setting of the rod lens is also not conducive to the miniaturization design of the endoscope.

[0006] Therefore, in view of the above technical problems, it is necessary to provide an endoscopic optical imaging system, an endoscopic imaging system, and an endoscopic device. Summary of the Invention

[0007] The purpose of the present invention is to provide an endoscopic optical imaging system, an endoscopic imaging system, and an endoscopic device, which can solve the problems of uneven illumination and large volume of the endoscope mentioned above.

[0008] To achieve the above purpose, a specific embodiment of the present invention provides an endoscopic optical imaging system, and the technical solution is as follows: An endoscopic optical imaging system includes an inner sheath for installing and accommodating an objective lens group, and an outer sheath sleeved around the outer periphery of the inner sheath. An annular space is formed between the inner sheath and the outer sheath, and illumination optical fibers are arranged in the annular space to provide illumination light; The optical imaging system further includes a light waveguide lens disposed at the same end of the inner mirror sheath and the outer mirror sheath. The light waveguide lens includes a first lens body and a second lens body that cooperate with each other. The first lens body includes a first surface close to the illumination optical fiber, a second surface far from the illumination optical fiber and parallel to the first surface, and an inclined surface connecting the first surface and the second surface. The second lens body includes a third surface close to the illumination optical fiber. The first lens body and the second lens body have a fitting interface. The first surface is provided with a first transmission surface for transmitting illumination light. The inclined surface is provided with a first reflection surface for totally reflecting illumination light. The fitting interface is provided with a first optical surface for totally reflecting illumination light or transmitting imaging light. The second surface is provided with a second transmission surface for transmitting illumination light and imaging light. The third surface is provided with a third transmission surface for transmitting imaging light. Wherein, the illumination light is incident on the first reflection surface through the first transmission surface and totally reflected, then incident on the first optical surface, and totally reflected again and then incident on the second transmission surface. The imaging light is incident through the second transmission surface, transmitted through the first optical surface, and exits from the third transmission surface to the objective lens assembly for imaging.

[0009] In one or more embodiments of the present invention, the illumination light incident into the first lens body through the first transmission surface is sequentially reflected by the first reflection surface and the first optical surface to the second surface to form an illumination area. Wherein, the illumination area is a simply connected area, and the second transmission surface is located within the illumination area.

[0010] In one or more embodiments of the present invention, in the reference section, the acute angle value of the angle between the inclined surface and the second surface is greater than or equal to the acute angle value of the angle between the fitting interface and the second surface. Wherein, the reference section is a plane obtained by cutting the first lens body with a plane passing through the central axis of the first lens body.

[0011] In one or more embodiments of the present invention, in the reference section, the angle between the inclined surface and the second surface is 45 degrees, and the angle between the fitting interface and the second surface is 45 degrees.

[0012] In one or more embodiments of the present invention, the illumination light incident into the first lens body through the first transmission surface satisfies: The adjacent edges of the first illumination beam and the second illumination beam converge at the center of the second transmission surface, and the illumination diameters of the first illumination beam and the second illumination beam are both greater than or equal to the reference radius of the second transmission surface. Wherein, the first illumination beam is the illumination light incident into the first lens body through the first reference incident surface, the second illumination beam is the illumination light incident into the first lens body through the second reference incident surface, the first reference incident surface and the second reference incident surface are the first transmission surfaces of two opposite parts on the reference section, the reference radius is the radius of the second transmission surface on the reference section, and the reference section is the plane obtained by cutting the first lens body with a plane passing through the central axis of the first lens body.

[0013] In one or more embodiments of the present invention, the first optical surface is formed by a dichroic mirror film disposed on the bonding interface.

[0014] In one or more embodiments of the present invention, the second lens body is fitted into the first lens body; Wherein, the central axes of the first lens body and the second lens body coincide; and / or, the first surface and the third surface are coplanarly arranged.

[0015] In one or more embodiments of the present invention, the optical imaging system further includes a third lens body attached to the second transmission surface, and the third lens body is used to transmit imaging light and the illumination light transmitted through the first lens body.

[0016] In one or more embodiments of the present invention, a collimating objective lens is installed between the light-emitting surface of the optical fiber and the objective lens module, and the focal point of the collimating objective lens is aligned with the light-emitting end face of the optical fiber; and / or, The second surface of the first lens body is perpendicular to the axis of the internal lens sheath; and / or, The second surface of the first lens body is flush with the end face of the external lens sheath.

[0017] A specific embodiment of the present invention further provides an endoscope imaging system, and the technical solution is as follows: An endoscope imaging system includes the above-mentioned endoscope optical imaging system. Wherein, the endoscope imaging system includes a photoelectric conversion module disposed inside the internal lens sheath and at the image distance position of the objective lens group for directly receiving imaging signals.

[0018] A specific embodiment of the present invention further provides an endoscope device, and the technical solution is as follows: An endoscope device includes the above-mentioned endoscope optical imaging system. Wherein, the endoscope device includes a light source for providing illumination light, an illumination optical fiber with one end connected to the light source and the other end extending and disposed inside the internal lens sheath and the external lens sheath for transmitting illumination light, a photoelectric conversion module disposed inside the internal lens sheath and at the image distance position of the objective lens group for receiving imaging signals, and a signal transmission line for transmitting the signals received by the photoelectric conversion module to a signal processing terminal.

[0019] In one or more embodiments of the present invention, one of the light source and the signal processing terminal is provided with a connection end, and the connection end is integrated with an optical signal interface and an optoelectronic signal interface; the illumination optical fiber is connected to the light source through the optical signal interface, and the signal transmission line is connected to the signal processing terminal through the optoelectronic signal interface.

[0020] In one or more embodiments of the present invention, the endoscope device includes a handle. One end of the handle is connected to the external sheath, and the other end is connected to the light source and the signal processing terminal through a wire harness. The wire harness includes the illumination optical fiber and the signal transmission line.

[0021] Compared with the prior art, in the illumination optical path of the endoscope optical imaging system of the present invention, the illumination light conducted by the illumination optical fiber is incident through the first transmission surface and finally exits from the second transmission surface. In the imaging optical path, the imaging light returning from the imaging target is incident through the second transmission surface and finally exits from the third transmission surface to the objective lens group for imaging. In the above illumination optical path, the illumination light can be incident from the area of the relative side edge of the optical waveguide lens and exit from the relative middle area of the optical waveguide lens. Such a setting method can match the optical path structure design of fiber illumination, and through the control of the illumination light shifting towards the center, it ensures the illumination effect of the observed area of the target object when in close contact with the target object and guarantees the imaging quality. At the same time, the endoscope imaging system of the present invention does not need to add an illumination lens between the illumination optical fiber and the beam splitter, and eliminates the traditional rod lens for transmitting images, significantly reducing the volume of the endoscope. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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 recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of an endoscope optical imaging system in an embodiment of the present invention; Figure 2 It is a schematic cross-sectional structure diagram of an optical waveguide lens in an embodiment of the present invention; Figure 3 It is a schematic diagram of the illumination optical path in an optical waveguide lens in an embodiment of the present invention; Figure 4 It is a schematic structural diagram of an endoscope optical imaging system in another embodiment of the present invention; Figure 5 It is a schematic structural diagram of a light source and a signal processing terminal in an embodiment of the present invention; Figure 6 Schematic structural diagram of a handle in an embodiment of the present invention.

[0024] Description of main reference numerals: 1. Objective lens group; 2. Inner lens sheath; 3. Outer lens sheath; 4. Illumination optical fiber; 5. Optical waveguide lens; 51. First lens body; 52. Second lens body; 53. Third lens body; 54. First surface; 541. First transmission surface; 55. Second surface; 551. Second transmission surface; 56. Inclined surface; 561. First reflection surface; 57. Third surface; 571. Third transmission surface; 58. Fitting interface; 581. First optical surface; 6. Collimating objective lens; 7. Light source; 8. Signal processing terminal; 9. Connection end; 10. Handle; 11. Photoelectric conversion module; 12. Signal transmission line. Detailed implementation manners

[0025] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] An endoscope is a medical device that enters the human body through a natural cavity to examine lesions, and its imaging depends on effective illumination. In traditional fiber illumination, a dark area is likely to appear in the central area when approaching the tissue, while in common-path illumination, although the uniformity can be improved, a lens needs to be added between the illumination optical fiber and the beam splitter, resulting in an increase in its lateral volume. The endoscopic optical imaging system of the present invention is applied to an endoscopic imaging system, which solves the problems of uneven illumination and excessive volume while ensuring the imaging quality.

[0027] Referring to Figure 1 , in an embodiment of the present invention, an endoscopic optical imaging system is provided, including an inner lens sheath 2 for mounting and accommodating the objective lens group 1, and an outer lens sheath 3 sleeved outside the inner lens sheath 2. An annular space is formed between the inner lens sheath 2 and the outer lens sheath 3, and an illumination optical fiber 4 is arranged in the annular space to provide illumination light. The illumination optical fiber 4 can be connected to an illumination host to provide illumination light.

[0028] Referring to Figure 1 and Figure 2, the optical imaging system further includes a light waveguide lens 5 disposed at the same end of the inner sheath 2 and the outer sheath 3. The light waveguide lens 5 includes a first lens body 51 and a second lens body 52 that cooperate with each other. The first lens body 51 includes a first surface 54 close to the illumination optical fiber 4, a second surface 55 away from the illumination optical fiber 4 and parallel to the first surface 54, and an inclined surface 56 connected between the first surface 54 and the second surface 55. The second lens body 52 includes a third surface 57 close to the illumination optical fiber 4. The first lens body 51 and the second lens body 52 have a fitting interface 58.

[0029] In this embodiment, taking the outer shape of the first lens body 51 being set as a frustum of a cone and the second lens body 52 being set as a cone as an example for a demonstrative elaboration. Therefore, the above-mentioned first surface 54 and second surface 55 can be understood as two opposite circular optical surfaces of the frustum of a cone, and the inclined surface 56 can be understood as the optical surface on the circumferential side of the frustum of a cone in a three-dimensional space. The third surface 57 can be understood as the circular optical surface of the cone, and the fitting interface 58 can be understood as the optical surface on the circumferential side of the cone in a three-dimensional space.

[0030] Referring to Figure 2 and Figure 3 , the first surface 54 is provided with a first transmission surface 541 for transmitting illumination light, the inclined surface 56 is provided with a first reflection surface 561 for totally reflecting illumination light, the fitting interface 58 is provided with a first optical surface 581 for totally reflecting illumination light or transmitting imaging light, the second surface 55 is provided with a second transmission surface 551 for transmitting illumination light and imaging light, and the third surface 57 is provided with a third transmission surface 571 for transmitting imaging light.

[0031] In the illumination optical path of the endoscope optical imaging system of this embodiment, the illumination light conducted by the illumination optical fiber 4 is incident on the first reflection surface 561 through the first transmission surface 541, totally reflected and then incident on the first optical surface 581, and totally reflected again and then incident on the second transmission surface 551 for transmission. Correspondingly, in the imaging optical path, the imaging light returning from the imaging target is incident through the second transmission surface 551, transmitted through the first optical surface 581 and then exits from the third transmission surface 571 to the objective lens group 1 for imaging.

[0032] It can be seen that in the above illumination optical path, the illumination light can be incident from the area of the opposite side edge of the light waveguide lens 5 and exit from the relatively middle area of the light waveguide lens 5. Such a setting method can match the optical path structure design of fiber illumination, and through the control of the illumination light shifting towards the center, it ensures the illumination effect of the observed area of the target object when in close contact with the target object and guarantees the imaging quality.

[0033] It can be understood that the first reflective surface 561 can be set in part or all of the inclined surface 56, and can be set in coordination with the optical path of the illumination light. Similarly, the first optical surface 581 can also be set in part or all of the bonding interface 58, and can be set in coordination with the illumination light and the imaging light. Similarly, the third transmissive surface 571 can also be set in part or all of the third surface 57, and can be set in coordination with the imaging light. This application does not specifically limit the above forms.

[0034] In this embodiment, the first transmission surface 541 is set to be annular, and the second transmission surface 551 and the third transmission surface 571 are set to be circular as an example to exemplify the optical waveguide lens 5 of this embodiment. In other embodiments, the first transmission surface 541, the second transmission surface 551 and the third transmission surface 571 can also be other shapes, and this application does not make specific restrictions on this. Correspondingly, the outer mirror sheath 3 and the inner mirror sheath 2 can be set to be cylindrical, and the optical fiber can be evenly arranged between the outer mirror sheath 3 and the inner mirror sheath 2 at equal distances around the circumference, further ensuring the uniformity of the illumination light.

[0035] Reference Figure 1 In this embodiment, the illumination light incident into the first mirror body 51 through the first transmission surface 541 is reflected to the second surface 55 through the first reflection surface 561 and the first optical surface 581 in sequence to form an illumination area, wherein the illumination area is a single connected area, and the second transmission surface 551 is located in the illumination area. The illumination area is a single connected area, which can effectively ensure its integrity, thereby effectively covering the imaging area of the tissue, so as to ensure the integrity and clarity of the tissue imaging.

[0036] In this embodiment, the first optical surface 581 is formed by a dichroic mirror film disposed on the bonding interface 58. That is, in this embodiment, when the illumination light passes through the first optical surface 581, it can reflect the illumination light; when the imaging light passes through the first optical surface 581, it can transmit the imaging light. Among them, the wavelength ranges of the illumination light and the imaging light do not overlap, so it can be ensured that the first optical surface 581 reflects the illumination light and transmits the imaging light. Specifically, the dichroic mirror film can be attached to the first mirror body 51, and can also be attached to the second mirror body 52.

[0037] Among them, according to the design principle of endoscope imaging, it can be divided into two types: white light imaging and fluorescence imaging. The endoscope optical imaging system in this embodiment is applied to fluorescence imaging. The illumination light involved in this embodiment is an excitation light source, and the imaging light is the fluorescence generated by the excitation light. The excitation light is incident from the first transmission surface 541, emitted from the second transmission surface 551 and irradiated to the tissue. Based on the principle of photoluminescence, the tissue can be excited by the excitation light to produce fluorescence. At this time, the fluorescence is incident from the second transmission surface 551 and emitted from the third transmission surface 571. Therefore, in this embodiment, the wavelength ranges of the illumination light (excitation light) and the imaging light (fluorescence) do not overlap.

[0038] Referring to Figure 2 and Figure 3 , on the reference cross-section, the acute angle value of the angle between the inclined surface 56 and the second surface 55 is greater than or equal to the acute angle value of the angle between the fitting interface 58 and the second surface 55. The reference cross-section is the plane obtained by cutting the first lens body 51 with a plane passing through the central axis of the first lens body 51. Therefore, by setting the positional and angular relationships among the first surface 54, the second surface 55, the inclined surface 56, and the fitting interface 58, it can be effectively ensured that the light incident from the first transmission surface 541 exits from the second transmission surface 551, and it can be ensured that the formed illumination area is a simply connected area to cover the second transmission surface 551.

[0039] Referring to Figure 2 , on the reference cross-section, in this embodiment, the angle between the inclined surface 56 and the second surface 55 is 45 degrees, and the angle between the fitting interface 58 and the second surface 55 is 45 degrees as an exemplary illustration. In other embodiments, the angles can also be adjusted. For example, the inclined surface 56 and the second surface 55 can also be parallelly arranged and set to other angle values.

[0040] Referring to Figure 2 and Figure 3 , the illumination light incident into the first lens body 51 through the first transmission surface satisfies: The adjacent edges of the first illumination beam and the second illumination beam converge at the center of the second transmission surface 551, and the illumination diameters of both the first illumination beam and the second illumination beam are greater than or equal to the reference radius of the second transmission surface 551; wherein, the first illumination beam is the illumination light incident into the first lens body 51 through the first reference incident surface, the second illumination beam is the illumination light incident into the first lens body 51 through the second reference incident surface, the first reference incident surface and the second reference incident surface are two opposite parts of the first transmission surface 541 on the reference cross-section, the reference radius is the radius of the second transmission surface 551 on the reference cross-section, and the reference cross-section is the plane obtained by cutting the first lens body 51 with a plane passing through the central axis of the first lens body 51. Figure 2 and Figure 3 The cross-section of the optical waveguide lens 5 shown in

[0041] is the above-mentioned reference cross-section.

[0042] Referring to Figure 2, the second lens body 52 is fitted inside the first lens body 51; wherein, the central axes of the first lens body 51 and the second lens body 52 coincide. In this embodiment, the first surface 54 and the third surface 57 are coplanar. In other embodiments, the first surface 54 and the third surface 57 may not be coplanar, that is, there may be a height difference between the third surface 57 and the first surface 54. Among them, the third surface 57 only needs to be ensured to be perpendicular to the imaging light, and its purpose is to ensure that the refraction direction of the imaging light when exiting from the third transmission surface 571 is towards the objective lens group 1 for imaging.

[0043] Referring to Figure 2 , in an alternative embodiment, the endoscopic optical imaging system further includes a third lens body 53 attached to the second transmission surface 551, and the third lens body 53 is used to transmit the imaging light and the illumination light transmitted through the first lens body 51. In this example, when the endoscopic objective module is applied to the endoscope, the third lens body 53 can be abutted against the tissue surface, reducing the vibration of the tissue and not affecting the imaging effect of the tissue. And the third lens body 53 can be used as a consumable, and its position setting can have a certain protective effect on the first lens body 51.

[0044] Referring to Figure 1 and Figure 2 , in this embodiment, the second surface 55 of the optical waveguide lens 5 is perpendicular to the axis of the inner sheath 2; and / or, the second surface 55 of the optical waveguide lens 5 is flush with the end face of the outer sheath 3. In the prior art, the end face of the endoscopic outer sheath 3 is mostly inclined, and the illumination optical path and the imaging optical path are arranged side by side at the position of the inclined surface 56. In this embodiment, the second surface 55 of the optical waveguide lens 5 is perpendicular to the axis of the inner sheath 2, and the second surface 55 of the optical waveguide lens 5 is flush with the end face of the outer sheath 3, which can realize imaging by the endoscope close to the imaging area to achieve distance-free adjustment with the imaging area.

[0045] Referring to Figure 4 , in an alternative embodiment, a collimating objective lens 6 is installed between the light-emitting surface of the optical fiber and the objective module, the focus of the collimating objective lens 6 is aligned with the light-emitting end face of the optical fiber, and the collimating objective lens 6 can collimate the illumination beam. It can be understood that in other embodiments, if the numerical aperture of the optical fiber itself is relatively low, the collimating objective lens 6 may not be used.

[0046] Referring to Figure 1, in an embodiment of the present invention, an endoscopic imaging system is further provided, including the above endoscopic optical imaging system. Among them, the endoscopic imaging system includes a photoelectric conversion module disposed inside the inner sheath 2 and at the image distance position of the objective lens group 1 for directly receiving imaging signals. In this embodiment, the light conversion module is located on the side of the objective lens group 1 away from the optical waveguide lens 5. The photoelectric conversion module can be a CMOS image sensor or a CCD image sensor. In the prior art, a rod lens is usually provided inside an endoscope, and the image is transmitted by means of the rod lens. In this embodiment, the photoelectric conversion module is directly disposed at the image distance position of the objective lens group 1, so that the rod lens can be omitted, and further, the volume of the endoscopic imaging system is reduced.

[0047] In the illumination optical path of the endoscopic optical imaging system of the present invention, the illumination light conducted by the illumination optical fiber 4 is incident through the first transmission surface 541 and finally exits from the second transmission surface 551. In the imaging optical path, the imaging light returning from the imaging target is incident through the second transmission surface 551 and finally exits from the third transmission surface 571 to the objective lens group 1 for imaging. In the above illumination optical path, the illumination light can be incident from the area of the opposite side edge of the optical waveguide lens 5 and exit from the relatively middle area of the optical waveguide lens 5. Such a setting method can match the optical path structure design of fiber illumination, and through the control of the illumination light shifting towards the center, it ensures the illumination effect of the observed area of the target object when in close contact with the target object, guaranteeing the imaging quality. At the same time, the endoscopic imaging system of the present invention does not need to add an illumination lens between the illumination optical fiber 4 and the beam splitter, and the traditional rod lens for transmitting images is omitted, significantly reducing the volume of the endoscope.

[0048] With reference to Figure 5 and Figure 6 , in an embodiment of the present invention, an endoscopic device is further provided, including the above endoscopic optical imaging system. Among them, the endoscopic device includes a light source 7 for providing illumination light, an illumination optical fiber 4 with one end connected to the light source 7 and the other end extending and disposed inside the inner sheath 2 and the outer sheath 3 for transmitting the illumination light, a photoelectric conversion module 11 disposed inside the inner sheath 2 and at the image distance position of the objective lens group 1 for receiving imaging signals, and a signal transmission line 12 for transmitting the signals received by the photoelectric conversion module to the signal processing terminal 8. When the endoscopic device of this embodiment is in use, the light source 7 conducts the illumination light to the optical waveguide lens 5 of the endoscopic optical imaging system through the illumination optical fiber 4 for illuminating the imaging target. The imaging light returning from the imaging target can travel to the photoelectric conversion module 11, and finally transmit the photoelectric signal to the signal processing terminal 8 through the signal transmission line 12.

[0049] It can be understood that since the endoscope device of this embodiment is provided with the above-mentioned endoscope optical imaging system, by controlling the illumination light to shift towards the center, it ensures the illumination effect of the observed area of the target object when in close contact with the target object, and guarantees the imaging quality.

[0050] Referring to Figure 5 and Figure 6 , in this embodiment, the endoscope device includes a handle 10. One end of the handle 10 is connected to an external sheath 3, and the other end is connected to a light source 7 and a signal processing terminal 8 through a wire harness. The wire harness includes an illumination optical fiber 4 and a signal transmission line 12. One of the light source 7 and the signal processing terminal 8 is provided with a connection end 9, and the connection end 9 integrates an optical signal interface and an optoelectronic signal interface; the illumination optical fiber 4 is connected to the light source 7 through the optical signal interface, and the signal transmission line 12 is connected to the signal processing terminal 8 through the optoelectronic signal interface. Exemplarily, the connection end 9 can be arranged on the host of the light source 7, or the connection end 9 can be arranged on the signal processing terminal 8.

[0051] One of the light source 7 and the signal processing terminal 8 is provided with a connection end 9, and the connection end 9 integrates an optical signal interface and an optoelectronic signal interface. When connecting to the endoscope handle 10 through this connection end 9, the situation of mutual entanglement between the optical fiber and the cable can be reduced, thereby ensuring the smooth progress of the on-site operation.

[0052] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0053] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An endoscopic optical imaging system, comprising an inner sheath for mounting and accommodating an objective lens group, and an outer sheath sleeved around the periphery of the inner sheath. An annular space is formed between the inner sheath and the outer sheath, and illumination optical fibers are arranged in the annular space to provide illumination light. It is characterized in that: The optical imaging system further comprises a waveguide lens disposed at the same end of the inner sheath and the outer sheath. The waveguide lens comprises a first lens body and a second lens body which cooperate with each other. The first lens body comprises a first surface close to the illumination optical fiber, a second surface far from the illumination optical fiber and parallel to the first surface, and an inclined surface connecting the first surface and the second surface. The second lens body comprises a third surface close to the illumination optical fiber. The first lens body and the second lens body have a fitting interface. The first surface is provided with a first transmission surface for transmitting illumination light, the inclined surface is provided with a first reflection surface for totally reflecting illumination light, the fitting interface is provided with a first optical surface for totally reflecting illumination light or transmitting imaging light, the second surface is provided with a second transmission surface for transmitting illumination light and imaging light, and the third surface is provided with a third transmission surface for transmitting imaging light. Wherein, the illumination light is incident on the first reflection surface through the first transmission surface and totally reflected, then incident on the first optical surface, and totally reflected again and then incident on the second transmission surface. The imaging light is incident through the second transmission surface, transmitted through the first optical surface and exits from the third transmission surface to the objective lens group for imaging.

2. The endoscopic optical imaging system according to claim 1, wherein The illumination light incident into the first lens body through the first transmission surface is sequentially reflected by the first reflection surface and the first optical surface to the second surface to form an illumination area. The illumination area is a simply connected area, and the second transmission surface is located within the illumination area.

3. The endoscopic optical imaging system according to claim 1, wherein On a reference section, the acute value of the angle between the inclined surface and the second surface is greater than or equal to the acute value of the angle between the fitting interface and the second surface. Wherein, the reference section is a plane obtained by cutting the first lens body with a plane passing through the central axis of the first lens body.

4. The endoscopic optical imaging system according to claim 3, wherein, On the reference section, the angle between the inclined surface and the second surface is 45 degrees, and the angle between the fitting interface and the second surface is 45 degrees.

5. The endoscopic optical imaging system according to claim 2, wherein The illumination light incident into the first lens body through the first transmission surface satisfies: The adjacent edges of the first illumination beam and the second illumination beam converge at the center of the second transmission surface, and the illumination diameters of the first illumination beam and the second illumination beam are both greater than or equal to the reference radius of the second transmission surface. Wherein, the first illumination beam is the illumination light incident into the first lens body through a first reference incident surface, the second illumination beam is the illumination light incident into the first lens body through a second reference incident surface. The first reference incident surface and the second reference incident surface are the first transmission surfaces of two opposite parts on the reference section. The reference radius is the radius of the second transmission surface on the reference section. The reference section is a plane obtained by cutting the first lens body with a plane passing through the central axis of the first lens body.

6. The endoscopic optical imaging system according to claim 1, characterized in that, The first optical surface is formed by a dichroic mirror film disposed on the fitting interface.

7. The endoscopic optical imaging system according to claim 1, characterized in that, The second lens body is fitted into the first lens body. Wherein, the central axes of the first lens body and the second lens body coincide; and / or, the first surface and the third surface are coplanar.

8. The endoscopic optical imaging system according to claim 1, wherein The optical imaging system further includes a third lens body attached to the second transmissive surface, and the third lens body is configured to transmit imaging light and the illumination light transmitted through the first lens body.

9. The endoscopic optical imaging system according to claim 1, wherein A collimating objective lens is installed between the light-emitting surface of the optical fiber and the objective lens module, and the focal point of the collimating objective lens is aligned with the light-emitting end face of the optical fiber; and / or, The second surface of the first lens body is perpendicular to the axis of the inner lens sheath; and / or, The second surface of the first lens body is flush with the end face of the outer lens sheath.

10. An endoscope imaging system, characterized in that: An endoscopic optical imaging system according to any one of claims 1-9, wherein the endoscopic imaging system includes a photoelectric conversion module disposed inside the inner lens sheath and at the image distance position of the objective lens group for directly receiving imaging signals.

11. An endoscope device, characterized in that: An endoscopic optical imaging system according to any one of claims 1-9, wherein the endoscopic device includes a light source for providing illumination light, an illumination optical fiber having one end connected to the light source and the other end extending inside the inner lens sheath and the outer lens sheath for transmitting the illumination light, a photoelectric conversion module disposed inside the inner lens sheath and at the image distance position of the objective lens group for receiving imaging signals, and a signal transmission line for transmitting the signals received by the photoelectric conversion module to a signal processing terminal.

12. The endoscopic device according to claim 11, characterized in that: One of the light source and the signal processing terminal is provided with a connection end, and the connection end is integrated with an optical signal interface and an optoelectronic signal interface; the illumination optical fiber is connected to the light source through the optical signal interface, and the signal transmission line is connected to the signal processing terminal through the optoelectronic signal interface.

13. The endoscopic device according to claim 11, characterized in that: The endoscopic device includes a handle, one end of the handle is connected to the outer lens sheath, and the other end is connected to the light source and the signal processing terminal through a wire harness, and the wire harness includes the illumination optical fiber and the signal transmission line.

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