Endoscope

Abstract

The utility model provides an endoscope which comprises a connecting cap, an isolating tube and a light-transmitting piece, a shooting window is arranged in the connecting cap, one end of the isolating tube facing the connecting cap is provided with a light blocking part, the light blocking part extends into the shooting window and is provided with a boss part extending out of the connecting cap, and the boss part extends into the shooting window. The light-transmitting sheet is arranged on the boss part; the projection of the light blocking part is located in the projection range of the shooting window in the axial direction of the connecting cap. The utility model provides an endoscope which is used for solving the technical problem that imaging quality is affected by interference of stray light.

Description

Technical Field

[0001] This utility model relates to the field of medical equipment, and in particular to an endoscope. Background Technology

[0002] Endoscopes are widely used in medical diagnosis and treatment. By inserting a thin insertion tube assembly into a narrow space inside a living organism, the camera module at the front end of the insertion tube assembly can examine lesions within the organism, thereby enabling the diagnosis and treatment of diseases.

[0003] In endoscopes, the light source and camera module are usually arranged alternately. During the illumination process, the light emitted by the light source is prone to total internal reflection. Some of the reflected stray light enters the camera module, affecting the imaging quality of the camera module and thus affecting the effectiveness of the endoscope.

[0004] In view of this, it is urgent to solve the technical problem of stray light interference affecting image quality. Utility Model Content

[0005] This invention provides an endoscope to solve the technical problem of stray light interference affecting image quality.

[0006] To achieve the above objectives, this utility model provides an endoscope, comprising: a connecting cap, an isolation tube, and a light-transmitting sheet. The connecting cap has an imaging window, and the isolation tube has a light-blocking portion at one end facing the connecting cap. The light-blocking portion extends into the imaging window, and the light-blocking portion has a protrusion extending out of the connecting cap. The light-transmitting sheet is disposed on the protrusion.

[0007] Along the axial direction of the connecting cap, the projection of the light-blocking part is located within the projection range of the shooting window.

[0008] The endoscope provided by this utility model has a light-blocking part at the front end of the isolation tube. The camera module is placed inside the isolation tube. The light-blocking part blocks the area around the camera module, effectively preventing the light reflected from the connecting cap from entering the inner wall of the isolation tube, thus filtering stray light and avoiding affecting the operation of the camera module inside the isolation tube, preventing glare, and improving the clarity of the camera module's images.

[0009] In one possible implementation, the boss portion has an inwardly folded edge that folds toward the center of the shooting window, and the edge of the light-transmitting sheet is fixedly connected to the inwardly folded edge.

[0010] In one possible implementation, the light-blocking part is a separate plastic component, which is connected to the end of the isolation tube facing the connecting cap, and a seal is formed between the light-blocking part and the isolation tube.

[0011] In one possible implementation, an isolation cavity is formed inside the isolation tube, and the light-blocking part is formed by coating the inner wall surface of the isolation cavity and the front end surface of the isolation cavity facing the connecting cap with a light-blocking layer.

[0012] In one possible implementation, the light-blocking part is peripherally closed, a light-transmitting hole is provided inside the light-blocking part, an isolation cavity is formed inside the isolation tube, and the light-transmitting hole communicates with the isolation cavity.

[0013] In one possible implementation, a seal is formed between the light-blocking portion and the inner wall surface of the shooting window.

[0014] In one possible implementation, the connecting cap is a light-transmitting element, and the connecting cap also has light-emitting portions spaced apart from the shooting window, with the light-blocking portions positioned between the edge of the shooting window and the light-emitting portions.

[0015] In one possible implementation, the endoscope further includes a body comprising a light source and a light guide, one end of the light guide extending to the light source and the other end extending to the light-emitting portion.

[0016] In one possible implementation, the main body further includes an imaging component comprising a camera module located within the isolation tube and abutting against the light-transmitting sheet.

[0017] In one possible implementation, the light guide comprises a glass optical fiber or a plastic optical fiber.

[0018] The endoscope provided by this utility model has a light-blocking part set at the front end of the isolation tube. After the light source emits light, the light source is blocked by the light-blocking part due to total internal reflection, which reduces the adverse effects of stray light on the image captured by the camera module and effectively ensures the clarity of the image.

[0019] In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by an endoscope provided by the embodiments of the present invention, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A cross-sectional view of an endoscope provided in an embodiment of this utility model;

[0022] Figure 2 for Figure 1 Enlarged view of the structure at point A;

[0023] Figure 3 A three-dimensional structural diagram of the connecting cap of the endoscope provided in an embodiment of this utility model;

[0024] Figure 4 A schematic diagram of the connection structure in which the boss of the endoscope protrudes from the connecting cap, as provided in an embodiment of this utility model.

[0025] Figure 5 A partial structural cross-sectional view of an endoscope provided in an embodiment of this utility model;

[0026] Figure 6 for Figure 1 Enlarged view of the structure at point B;

[0027] Figure 7 A three-dimensional structural diagram of the endoscope provided for an embodiment of this utility model;

[0028] Figure 8 This is a three-dimensional structural diagram of the inner shell of the endoscope provided in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 10-Connecting cap;

[0031] 11-Shooting window;

[0032] 12-Light emitting part;

[0033] 13-Front panel;

[0034] 14-Side panels;

[0035] 20-Isolation tube;

[0036] 21-Isolation chamber;

[0037] 30-Transparent film;

[0038] 40 - Light-blocking section;

[0039] 41 - Bossed section;

[0040] 411 - Inward flange;

[0041] 42 - Light-transmitting hole;

[0042] 50 - Insert tube;

[0043] 51-Inner cavity;

[0044] 52-Inner pipe;

[0045] 521 - Operation Channel;

[0046] 60-Main Body;

[0047] 61-Imaging component;

[0048] 611 - Camera Module;

[0049] 612 - Image sensor device;

[0050] 62 - Outer shell;

[0051] 621 - First accommodating cavity;

[0052] 63 - Inner shell;

[0053] 631 - Installation Department;

[0054] 632 - Tubular portion;

[0055] 633-Cap;

[0056] 64-Handle;

[0057] 641 - Operation button;

[0058] 65 - Connecting pipe;

[0059] 651 - First interface tube;

[0060] 652 - Second interface tube;

[0061] 71-Light source;

[0062] 72-Light guide;

[0063] 80 - Valve body. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0065] Endoscopes are widely used for in vivo diagnosis and treatment. When in use, the endoscope is inserted into the organ to be examined, allowing direct visualization of lesions that cannot be observed with the naked eye. Therefore, a camera module is usually installed at the front end of the endoscope to capture images and transmit them to an external receiver. The captured images are then magnified and displayed on a screen connected to the external receiver to assist medical personnel in diagnosing and treating diseases.

[0066] The endoscope provided by this utility model can be a hysteroscope, used for uterine cavity surgery. Before performing hysteroscopic surgery, it is necessary to inject fluid into the uterus to expand the uterus so as to examine the inside of the uterine cavity and obtain clear images. The surgical instruments are used to perform surgical operations on the patient's uterine cavity through the hysteroscope. Therefore, it is necessary to realize the injection and drainage of fluids such as distending fluid. Before the operation, distending fluid is introduced into the uterine cavity, and after the examination, the distending fluid is drained.

[0067] Because sufficient light is required for hysteroscopic imaging, optical fibers are usually installed to guide the light emitted from the light source to the front end of the endoscope. The light then shines out from the connecting cap at the front end of the endoscope. When the light shines into the air through the connecting cap, total internal reflection occurs, meaning that some light will exit from the connecting cap and re-enter the camera module, affecting the image quality and thus the effectiveness of the endoscopic surgery.

[0068] The endoscope provided in the embodiments of this utility model is described below with reference to the accompanying drawings.

[0069] refer to Figure 1 and Figure 2 As shown, this utility model provides an endoscope, including: a connecting cap 10, an isolation tube 20, and a light-transmitting plate 30, for reference. Figure 2 and Figure 3 As shown, a shooting window 11 is provided inside the connecting cap 10. The end of the isolation tube 20 facing the connecting cap 10 has a light-blocking part 40, which extends into the shooting window 11. The light-blocking part 40 has a protrusion 41 extending out of the connecting cap 10, and a light-transmitting sheet 30 is disposed on the protrusion 41. Along the axial direction of the connecting cap 10, the projection of the light-blocking part 40 is located within the projection range of the shooting window 11.

[0070] The endoscope provided by this utility model has a light-blocking part 40 at the front end of the isolation tube 20. The camera module 611 is placed inside the isolation tube 20. The light-blocking part 40 blocks the area around the camera module 611, effectively blocking the light reflected by the connecting cap 10 from entering the inner wall of the isolation tube 20, thereby filtering stray light and avoiding affecting the operation of the camera module 611 inside the isolation tube 20, preventing glare, and improving the clarity of the images captured by the camera module 611.

[0071] refer to Figure 4 and Figure 5 As shown, the protrusion 41 extends from the front end face of the connector cap 10, so that the light reflected by the connector cap 10 can be effectively blocked by the protrusion 41, preventing the light from entering the isolation tube 20 along the front end face of the connector cap 10. The protrusion 41 can improve the light blocking effect and reduce the amount of light entering the isolation tube 20 from the edge of the shooting window 11, thereby improving the clarity of the image captured by the camera module 611.

[0072] Along the axial direction of the connecting cap 10, the projection of the light-blocking part 40 is located within the projection range of the shooting window 11, making the installation of the light-blocking part 40 and the isolation tube 20 more convenient and helping to reduce the precision requirements for the assembly of the light-blocking part 40. The extended length of the light-blocking part 40 can compensate for assembly errors. The axial direction of the connecting cap 10, referenced... Figure 2 The direction indicated by the arrow X in the diagram.

[0073] refer to Figure 2 As shown, the light-transmitting sheet 30 can be, for example, a transparent glass sheet or a transparent resin sheet, so that light can pass through the light-transmitting sheet 30 and enter the isolation tube 20 to provide illumination for the camera module 611 to capture images.

[0074] The cross-sectional shape of the isolation tube 20 can be rectangular, circular, elliptical, etc. The isolation tube 20 serves to isolate the camera module 611, preventing it from being contaminated and facilitating its reuse. The shape of the shooting window 11 is consistent with the cross-sectional shape of the isolation tube 20.

[0075] In one possible implementation method, refer to Figure 2 and Figure 3 As shown, the boss portion 41 has an inwardly folded edge 411 that folds towards the center of the shooting window 11, and the edge of the light-transmitting sheet 30 is fixedly connected to the inwardly folded edge 411. The inwardly folded edge 411 is provided to improve the sealing effect and facilitate the installation of the light-transmitting sheet 30.

[0076] The space between the light-transmitting sheet 30 and the inner flange 411 is filled with sealant, which not only fixes the light-transmitting sheet 30, but also provides a waterproof seal. During the operation, it can prevent distending fluid from entering the isolation tube 20 from the front end of the connecting cap 10, thereby protecting the camera module 611 located inside the isolation tube 20 from contamination by the distending fluid.

[0077] In one possible implementation method, refer to Figure 4 and Figure 5As shown, the light-blocking part 40 is an independent plastic component. The light-blocking part 40 is connected to the end of the isolation tube 20 facing the connecting cap 10, and a seal is formed between the light-blocking part 40 and the isolation tube 20. For example, the light-blocking part 40 and the isolation tube 20 can be connected by sealant to achieve the sealing effect.

[0078] To ensure the effective light-blocking effect of the light-blocking part 40, the light-blocking part 40 can be black or dark blue, etc., to effectively block light from entering the interior of the isolation tube 20 through the light-blocking part 40.

[0079] In one possible implementation, an isolation cavity 21 is formed inside the isolation tube 20. The inner wall surface of the isolation cavity 21 and the front end surface of the isolation cavity 21 facing the connecting cap 10 are coated with a light-shielding layer to form a light-blocking portion 40. The light-shielding layer can be, for example, an ink layer, which is low in cost and has a good light-blocking effect.

[0080] In one possible implementation, the light-blocking part 40 is closed on all sides, a light-transmitting hole 42 is provided inside the light-blocking part 40, an isolation cavity 21 is formed inside the isolation tube 20, and the light-transmitting hole 42 is connected to the isolation cavity 21.

[0081] The light-blocking part 40 is closed around its periphery, providing a 360° light-blocking effect on the periphery of the camera module 611 located in the isolation cavity 21. The light-blocking part 40 is ring-shaped, so that light can only be received through the light-transmitting hole 42, effectively filtering stray light reflected by the connecting cap 10, thereby improving the shooting quality of the camera module 611.

[0082] In one possible implementation, a seal is formed between the light-blocking portion 40 and the inner wall surface of the shooting window 11. For example, sealant is applied between the light-blocking portion 40 and the inner wall surface of the shooting window 11 to achieve a waterproof seal.

[0083] In one possible implementation, the connecting cap 10 is a light-transmitting element, and the connecting cap 10 also has light-emitting portions 12 spaced apart from the shooting window 11, and light-blocking portions 40 are blocked between the edge of the shooting window 11 and the light-emitting portions 12.

[0084] refer to Figure 1 , Figure 2 and Figure 3 As shown, the connecting cap 10 is made of transparent resin. This structure allows the light from the light guide 72 to illuminate a larger area with the help of the connecting cap 10, improving the uniformity of illumination and enhancing the shooting effect. To improve the illumination effect of the light from the light guide 72 on the front side of the connecting cap 10, the light emitting part 12 can be curved, protruding from the front end face of the connecting cap 10, which helps to increase the angle of the light and expand the illumination range.

[0085] In one possible implementation method, refer to Figure 2 and Figure 4 As shown, the endoscope also includes an insertion tube 50, a connecting cap 10 is disposed at the front end of the insertion tube 50, an inner cavity 51 is formed within the insertion tube 50, and an isolation tube 20 is disposed within the inner cavity 51. (Reference) Figure 3 and Figure 4 As shown, the connecting cap 10 includes a front panel 13 and a side panel 14. The side panel 14 is connected to the edge of the front panel 13. The shooting window 11 is opened inside the front panel 13. One end of the side panel 14 relative to the front panel 13 is connected to the front end of the insertion tube 50.

[0086] The end of the side panel 14 relative to the front panel 13 can overlap with the insertion tube 50 and then be connected by sealant to improve the waterproofness of the connection position between the connecting cap 10 and the insertion tube 50.

[0087] The side panel 14 overlaps at the connection point between the isolation tube 20 and the light-blocking part 40, and sealant is filled between the side panel 14 and the isolation tube 20, as well as between the side panel 14 and the light-blocking part 40, to ensure the stability of the connection and the sealing effect.

[0088] refer to Figure 4 and Figure 5 As shown, the endoscope also includes an inner tube 52, which is arranged parallel to the isolation tube 20 inside the insertion tube 50. The inner tube 52 has an operating channel 521 inside, which is used for the passage of surgical instruments and distending fluid. A flow channel is also formed on the inner wall of the insertion tube 50 and between the inner tube 52 and the isolation tube 20, which is used for the passage of distending fluid. One of the operating channel 521 and the flow channel serves as a channel for injecting distending fluid into the uterine cavity, and the other serves as a channel for draining distending fluid from the uterine cavity.

[0089] The present invention provides an endoscope in which an insertion tube 50 is inserted into a biological body during use. The insertion tube 50 and the connecting cap 10 are in direct contact with the biological tissue to achieve examination and treatment of lesions. The insertion tube 50 is a circumferentially closed tubular structure, which serves to protect the isolation tube 20 and the inner tube 52.

[0090] In one possible implementation method, refer to Figure 1 and Figure 4 As shown, the endoscope also includes a main body 60, which includes a light source 71 and a light guide 72. One end of the light guide 72 extends to the light source 71, and the other end extends to the light emission section 12. The light source 71 can be disposed inside the main body 60. The light source 71 can be, for example, a light-emitting diode (LED). LEDs have the advantages of small size, low power consumption, high brightness, long lifespan, and energy saving and environmental protection.

[0091] In one possible implementation, the light guide 72 comprises glass optical fiber or plastic optical fiber, resulting in low optical signal loss.

[0092] refer to Figure 1 and Figure 2 As shown, the main body 60 also includes an imaging component 61, which includes a camera module 611 located within the isolation tube 20 and abutting against the light-transmitting sheet 30. The imaging component 61 also includes an image sensor 612 connected to the camera module 611 via a signal line located within the isolation tube 20. The image sensor 612 may be, for example, an image sensor chip.

[0093] The main body 60 also includes an outer shell 62 and an inner shell 63. The outer shell 62 has a first accommodating cavity 621 inside. The inner shell 63 includes a mounting portion 631 and a tubular portion 632. The tubular portion 632 is disposed within the first accommodating cavity 621. The mounting portion 631 is exposed at the rear end of the outer shell 62 and is used to mount a light source 71, an image sensor device 612, etc. (Reference) Figure 1 , Figure 7 and Figure 8 As shown, a cover 633 is pivotally connected to one end of the mounting part 631 away from the tubular part 632. The cover 633 can be flipped to facilitate opening the cover 633 and disassembling the light source 71 and image sensor 612 inside the mounting part 631.

[0094] refer to Figure 2 As shown, the isolation tube 20 is a long and thin pipe. One end of the isolation tube 20 extends into the mounting part 631, and the other end of the isolation tube 20 is located inside the insertion tube 50.

[0095] In one possible implementation method, refer to Figure 1 and Figure 6 As shown, the main body 60 also includes a connecting tube 65, which may be sleeved on the outer wall of the tubular portion 632. A first interface tube 651 and a second interface tube 652 are connected to the connecting tube 65. The first interface tube 651 and the second interface tube 652 are separated between the connecting tube 65 and the tubular portion 632, so that the first interface tube 651 and the second interface tube 652 remain relatively independent. The first interface tube 651 and the second interface tube 652 are respectively connected to the valve body 80. One of the first interface tube 651 and the second interface tube 652 is an injection tube for the distending fluid to enter the endoscope, and the other of the first interface tube 651 and the second interface tube 652 is an discharge tube for the distending fluid to exit.

[0096] For example, the first interface tube 651 is the inlet tube and the second interface tube 652 is the outlet tube. When the distending fluid needs to be injected into the uterus, the distending fluid enters the flow channel from the first interface tube 651 and then enters the uterine cavity from the inlet port on the front panel 13 of the connecting cap 10. When the distending fluid needs to be discharged from the uterus, the distending fluid enters the operating channel 521 inside the inner tube 52 through the outlet port on the front panel 13 of the connecting cap 10 and then is discharged through the second interface tube 652, thereby realizing the discharge of the distending fluid.

[0097] refer to Figure 1 and Figure 7 As shown, a handle 64 is connected to one side of the outer casing 62. An operating button 641 is provided on the handle 64. Medical staff can use the endoscope by holding the handle 64. The operating button 641 can be a button or a knob, for example, it can be used to control the operation of the imaging component 61.

[0098] The endoscope provided by this utility model has a light-blocking part 40 set at the front end of the isolation tube 20. After the light source 71 emits light, the light source 71 is blocked by the light-blocking part 40 due to total internal reflection, which will not affect the image captured by the camera module 611 and effectively ensures the clarity of the image.

[0099] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", etc., used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the indicated position or component must have a specific orientation, or a specific structure and operation, and therefore should not be construed as a limitation of this utility model.

[0100] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0101] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0102] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An endoscope, characterized in that, include: The assembly includes a connecting cap (10), an isolation tube (20), and a light-transmitting sheet (30). The connecting cap (10) has a shooting window (11) inside. The isolation tube (20) has a light-blocking part (40) at one end facing the connecting cap (10). The light-blocking part (40) extends into the shooting window (11), and the light-blocking part (40) has a protrusion (41) extending out of the connecting cap (10). The light-transmitting sheet (30) is disposed on the protrusion (41). Along the axial direction of the connecting cap (10), the projection of the light-blocking part (40) is located within the projection range of the shooting window (11).

2. The endoscope according to claim 1, characterized in that, The boss portion (41) has an inner flange (411) that folds toward the center of the shooting window (11), and the edge of the light-transmitting sheet (30) is fixedly connected to the inner flange (411).

3. The endoscope according to claim 1, characterized in that, The light-blocking part (40) is an independent plastic part. The light-blocking part (40) is connected to one end of the isolation tube (20) facing the connecting cap (10), and a seal is formed between the light-blocking part (40) and the isolation tube (20).

4. The endoscope according to claim 1, characterized in that, An isolation cavity (21) is formed inside the isolation tube (20), and the light-blocking part (40) is formed by coating a light-blocking layer on the inner wall surface of the isolation cavity (21) and the front end surface of the isolation cavity (21) facing the connecting cap (10).

5. The endoscope according to claim 1, characterized in that, The light-blocking part (40) is closed on the periphery, and a light-transmitting hole (42) is provided inside the light-blocking part (40). An isolation cavity (21) is formed inside the isolation tube (20), and the light-transmitting hole (42) is connected to the isolation cavity (21).

6. The endoscope according to claim 1, characterized in that, A seal is formed between the light-blocking part (40) and the inner wall surface of the shooting window (11).

7. The endoscope according to any one of claims 1-6, characterized in that, The connecting cap (10) is a light-transmitting component. The connecting cap (10) also has light-emitting portions (12) spaced apart from the shooting window (11). The light-blocking portion (40) is blocked between the edge of the shooting window (11) and the light-emitting portion (12).

8. The endoscope according to claim 7, characterized in that, It also includes a main body (60), which includes a light source (71) and a light guide (72), one end of which extends to the light source (71) and the other end of which extends to the light-emitting part (12).

9. The endoscope according to claim 8, characterized in that, The main body (60) also includes an imaging component (61), which includes a camera module (611) located inside the isolation tube (20) and abutting against the light-transmitting sheet (30).

10. The endoscope according to claim 8, characterized in that, The light guide (72) includes glass optical fiber or plastic optical fiber.

Images