Endoscope illumination optical system and electronic endoscope

Abstract

The invention discloses an endoscope illumination optical system which comprises a first lens group module, a second lens group module, a U-shaped lens group module and a light supply mechanism. The first lens group module comprises an outer sleeve, a first lens, a second lens, a third lens and a fourth lens; the U-shaped lens group module comprises a U-shaped outer sleeve, a first U-shaped lens, a second U-shaped lens, a third U-shaped lens and a fourth U-shaped lens; the light supply mechanism comprises a first optical fiber assembly, a second optical fiber assembly and a third optical fiber assembly. Under the condition that the endoscope is not adjusted frequently, the illumination position can be changed, the lesion position or the injury position can be shot more efficiently, and a patient feels more comfortable when doing the endoscope.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic endoscopes, and particularly to an endoscope illumination optical system and an electronic endoscope. Background Art

[0002] The endoscope system includes an electronic endoscope, a processor, and a light source device. The light source device emits light, and the light enters the illumination lens at the front end of the endoscope insertion part through a condenser lens and a light guide rod, and then the illumination of the observation part is realized through the illumination lens. However, the irradiation position needs to be repeatedly adjusted to align the irradiation position, and pulling or rotating back and forth causes great damage to the esophagus and stomach, and the operation process is also very uncomfortable. In order to emit illumination light with a large divergence angle as much as possible, in some prior arts, a glass rod is arranged between the light source device and the light guide rod to improve the illumination effect of the illumination light. However, such a solution cannot effectively emit illumination light with a large light beam angle in actual application. Therefore, multiple light sources need to be focused and overlapped to increase the light intensity. Since the light source focusing point at the position of the endoscope lens is not adjustable or the adjustment is troublesome, sometimes the light source needs to be focused at certain points to have strong illumination to ensure the brightness of the observation. However, the light at the end of the endoscope is generally not adjustable, and only by adjusting the position of the endoscope, the pain of the patient is aggravated during the operation process. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this reason, an object of the present invention is to provide an endoscope illumination optical system and an electronic endoscope, which solve the problems such as the non-adjustability of the light condensing position, insufficient light intensity, and the need to pull and rotate the endoscope back and forth during adjustment, making the patient very uncomfortable during the observation process.

[0004] An endoscope illumination optical system according to the present invention includes a first lens group module, a second lens group module, a U-shaped lens group module, and a light supply mechanism;

[0005] The structures of the first lens group module and the second lens group module are the same and the two are arranged side by side. The first lens group module includes an outer sleeve, and a first lens, a second lens, a third lens, and a fourth lens are sequentially arranged in the outer sleeve from the tail end to the front end. The rear sides of the first lens and the third lens are both spherical surfaces protruding outward, the two side surfaces of the second lens are both spherical surfaces concave inward, the sizes and areas of the spherical surface protruding outward and the spherical surface concave inward are the same, the rear side of the fourth lens is a semi-spherical surface concave inward, and gaps are left between adjacent lenses of the first lens, the second lens, the third lens, and the fourth lens;

[0006] The U-shaped lens group module includes a U-shaped outer sleeve, and the U-shaped outer sleeve is embedded with a first U-shaped lens, a second U-shaped lens, a third U-shaped lens, and a fourth U-shaped lens arranged in sequence from the tail end to the front end. The cross-sectional view of the U-shaped outer sleeve at any position perpendicular to its side wall is the same as the cross-sectional view of the lens inside the outer sleeve.

[0007] The light supply mechanism includes a first optical fiber assembly, a second optical fiber assembly, and a third optical fiber assembly.

[0008] The first optical fiber assembly and the second optical fiber assembly have the same structure and are symmetrically arranged. The first optical fiber assembly includes a first optical fiber, an optical fiber sleeve, a sleeve limit sleeve, and a pulling mechanism for pulling the optical fiber sleeve to move inside the sleeve limit sleeve. The end of the first optical fiber is sleeved with the optical fiber sleeve, so that the first optical fiber faces the tail end of the outer sleeve and is perpendicular to the first lens. Four sliding rods are symmetrically arranged on both sides of the optical fiber sleeve. Four symmetrically parallel sliding grooves are arranged on the inner side wall of the sleeve limit sleeve. The four sliding rods are correspondingly arranged in the four sliding grooves. The second optical fiber group is arranged at the tail end of the second lens group module.

[0009] The third optical fiber assembly includes a third optical fiber, an extended optical fiber sleeve, a swing rod, and a swing assembly. The end of the third optical fiber is sleeved with the extended optical fiber sleeve, so that the third optical fiber faces the tail end of the U-shaped outer sleeve and is perpendicular to the first U-shaped lens. The bottom end of the swing rod is sleeved on the tail end of the extended optical fiber sleeve. The swing assembly includes a swing motor. The top end of the swing rod is sleeved on the rotating shaft of the swing motor, and the rotating shaft is sleeved with bearing on both sides of the swing rod. When the extended optical fiber sleeve swings, it swings along the tail end of the U-shaped outer sleeve.

[0010] The first optical fiber, the second optical fiber in the second optical fiber group, and the input end of the third optical fiber are connected to the illumination optical system of the endoscope.

[0011] In some embodiments of the present invention, the central positions of the two outer sleeves and the central position of the middle line of the U-shaped outer sleeve are sequentially connected to form an equilateral triangle. The length of the connection line between the central position of any one of the outer sleeves and the central position of the middle line of the U-shaped outer sleeve is 1.5-2.0 times the length of the connection line between the central positions of the two outer sleeves. A camera optical module is arranged in the space between the two outer sleeves and the U-shaped outer sleeve.

[0012] In other embodiments of the present invention, the outer side wall and the inner side wall of the U-shaped outer sleeve are both cylindrical walls, and the radian of the outer side wall and the inner side wall is 120-145°. The distance between the outer side wall and the inner side wall of the U-shaped outer sleeve is 2 / 3 of the diameter of the outer sleeve.

[0013] In some other embodiments of the present invention, both ends of the sleeve limiting sleeve are semi-cylindrical walls, and there are two parallel plates in the middle. The inner side walls of the semi-cylindrical walls match the outer wall of the optical fiber sleeve. The distance between the two parallel plates is 0.5 - 0.8 mm larger than the diameter of the optical fiber sleeve. The length of the line connecting the middle positions at both ends of the sleeve limiting sleeve is equal to the diameter of the outer sleeve.

[0014] In some other embodiments of the present invention, the pulling mechanism includes a pull rod, a pulling lead screw, and a driving motor. The top end of the pull rod movably penetrates through the middle of the semi-cylindrical wall at the bottom end of the sleeve limiting sleeve and is fixed on the optical fiber sleeve. The pulling lead screw spirally penetrates from the bottom end of the pull rod into its interior. A first bevel gear disc is sleeved at the bottom end of the pulling lead screw, and a stable bearing is sleeved above the first bevel gear disc. A second bevel gear disc is sleeved at the end of the driving motor shaft, and a second stable bearing is sleeved on the inner shaft of the second bevel gear disc. The first bevel gear disc meshes with the second bevel gear disc.

[0015] In some other embodiments of the present invention, the sleeve limiting sleeve inclines inward from the top to the bottom, and the included angle between the sleeve limiting sleeve and the vertical plane is 30°.

[0016] In some other embodiments of the present invention, the gaps between adjacent ones of the first lens, the second lens, the third lens, and the fourth lens are 3 - 5 mm, and the gaps between the first lens, the second lens, the third lens, and the fourth lens are calculated based on the side planes.

[0017] In some other embodiments of the present invention, the first lens group module, the second lens group module, and the U-shaped lens group module are sleeved by a sleeve. The gaps between the first lens group module, the second lens group module, and the U-shaped lens group module and the gaps between them and the inner wall of the sleeve are filled with glue.

[0018] An electronic endoscope includes the above endoscopic illumination optical system, and further includes a camera optical module, an illumination optical system, and a control system. The camera optical module is arranged at the spatial position between the first lens group module, the second lens group module, and the U-shaped lens group module. Both the camera optical module and the illumination optical system are electrically connected to the control system. The first optical fiber assembly, the second optical fiber assembly, and the third optical fiber assembly in the endoscopic illumination optical system are all connected to the illumination optical system.

[0019] In the present invention, the first optical fiber assembly, the second optical fiber assembly, and the third optical fiber assembly are not directly connected to the first lens group module, the second lens group module, and the U-shaped lens group module respectively. There is a gap at the docking position. By adjusting the alignment positions of the fiber heads of the first optical fiber assembly, the second optical fiber assembly, and the third optical fiber assembly, the light penetrates different paths in the corresponding lens group modules, realizing the change of the light irradiation position on the endoscope head. Thus, without frequently adjusting the endoscope, the change of the illumination position can be achieved, and the diseased or damaged positions can be photographed more efficiently, making the patient feel more comfortable during the endoscopy. Description of the Drawings

[0020] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0021] Figure 1 It is a schematic structural diagram of an endoscopic illumination optical system proposed by the present invention.

[0022] Figure 2 is Figure 1 A schematic structural diagram of the structure at position A in

[0023] Figure 3 It is a schematic cross-sectional structure diagram of the first optical fiber of the present invention at the outer edge position of the first lens group module.

[0024] Figure 4 It is a schematic structural diagram of the cross-section of the first optical fiber of the present invention at the center position of the first lens group module.

[0025] Figure 5 It is a schematic cross-sectional structure diagram of the first optical fiber of the present invention at the inner edge position of the first lens group module.

[0026] Figure 6 It is a schematic cross-sectional structure diagram of the sleeve limiting sleeve and a part of the pulling mechanism proposed by the present invention.

[0027] Figure 7 It is a schematic structural diagram of the position of the sleeve limiting sleeve and two outer sleeves proposed by the present invention.

[0028] Figure 8 It is a schematic principle diagram of the third optical fiber aligning with the left edge position of the third lens group module and the second optical fiber aligning with the outer edge position of the second lens group module proposed by the present invention.

[0029] Figure 9 It is a schematic principle diagram of the third optical fiber aligning with the middle position of the left half of the third lens group module and the second optical fiber aligning with the position near the central edge of the second lens group module proposed by the present invention.

[0030] Figure 10Schematic diagram of the principle of the third optical fiber aligning with the middle position of the third lens group module, the second optical fiber aligning with the center position of the second lens group module, and the first optical fiber aligning with the center position of the first lens group module proposed by the present invention.

[0031] Figure 11 Schematic diagram of the principle of the third optical fiber aligning with the right edge position of the third lens group module and the first optical fiber aligning with the outer edge position of the first lens group module proposed by the present invention.

[0032] Figures 8-11 The dotted circle in the figure is the light diffusion position.

[0033] In the figure: 1. The first lens group module; 11. The first lens; 12. The second lens; 13. The third lens; 14. The fourth lens; 2. The second lens group module; 3. The U-shaped lens group module; 4. ; 5. The sleeve limit sleeve; 6. The first optical fiber; 61. The optical fiber sleeve; 611. The slide bar; 62. The extended optical fiber sleeve; 7. The swing rod; 71. The swing motor; 8. The drive motor; 81. The second stable bearing; 82. The second bevel gear disk; 9. The pull rod; 91. The pull screw rod; 92. The stable bearing; 93. The first bevel gear disk. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described 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.

[0035] As Figures 1-11 shown, an endoscope illumination optical system proposed by the present invention includes a first lens group module 1, a second lens group module 2, a U-shaped lens group module 3, and a light supply mechanism;

[0036] The structure of the first lens group module 1 is the same as that of the second lens group module 2 and the two are arranged side by side. The first lens group module 1 includes an outer sleeve and a first lens 11, a second lens 12, a third lens 13, and a fourth lens 14 that are sequentially arranged from the tail end to the front end inside the outer sleeve. The rear sides of the first lens 11 and the third lens 13 are both spherical surfaces protruding outward, the two side surfaces of the second lens 12 are both spherical surfaces concave inward, the sizes and areas of the spherical surfaces protruding outward and the spherical surfaces concave inward are the same, the rear side of the fourth lens is a semi-spherical surface concave inward, and there are gaps between adjacent lenses of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14;

[0037] The structure of the first lens group module 1 is symmetric with the second lens group module 2 in the upper half, which can independently use the first lens group module 1 or the second lens group module 2 to perform precise focusing on the left and right halves, or the two can focus in the middle position to increase the brightness of the center position.

[0038] The U-shaped lens group module 3 includes a U-shaped outer sleeve, and the U-shaped outer sleeve is embedded with a first U-shaped lens, a second U-shaped lens, a third U-shaped lens, and a fourth U-shaped lens arranged in sequence from the tail end to the front end. The cross-section of the U-shaped outer sleeve at any position perpendicular to its side wall is the same as the cross-section of the lens inside the outer sleeve;

[0039] The U-shaped lens group module 3 is used to provide illumination in an arc shape at the lower part. Because the imaging optical module 4 is arranged at the central position, light diffusion and overlap are used to illuminate the central position, so as to facilitate the imaging optical module 4 to collect light and photograph the position of the patient.

[0040] Figures 7-11 It is a schematic diagram of light irradiation. The irradiation is focused at different positions.

[0041] The light supply mechanism includes a first optical fiber assembly, a second optical fiber assembly, and a third optical fiber assembly;

[0042] The first optical fiber assembly and the second optical fiber assembly have the same structure and are symmetrically arranged. The first optical fiber assembly includes a first optical fiber 6, an optical fiber sleeve 61, a sleeve limit sleeve 5, and a pulling mechanism for pulling the optical fiber sleeve 61 to move within the sleeve limit sleeve 5. The end of the first optical fiber 6 is sleeved with the optical fiber sleeve 61 so that the first optical fiber 6 faces the tail end of the outer sleeve and is perpendicular to the first lens 11. Four sliding rods 611 are symmetrically arranged on both sides of the optical fiber sleeve 61. Four symmetrically parallel sliding grooves are arranged on the inner side wall of the sleeve limit sleeve 5. The four sliding rods 611 are correspondingly arranged in the four sliding grooves. The second optical fiber group is arranged at the tail end of the second lens group module 2;

[0043] The first optical fiber 6 (the same material as the second optical fiber and the third optical fiber) uses an optical fiber tube, a light guide tube, etc. of a certain thickness, which belongs to the commonly used materials for endoscopes. Since the first optical fiber 6 can move at the position where it is sleeved by the optical fiber sleeve 61 and in a neighboring section, the pulling mechanism is used to pull the optical fiber sleeve 61 to move, so as to align different positions at the tail end of the first lens 11 ( Figures 3-5 , from the outer edge to the inner edge), the light focusing points are different. After passing through multiple lenses, the light is more uniform. However, it is not limited to the above four lenses and can be set more complex according to needs, so that after the light passes through, the adjustment ability is stronger.

[0044] The third optical fiber assembly includes a third optical fiber, an extended optical fiber sleeve 62, a swing rod 7, and a swing assembly. The end of the third optical fiber is sleeved with the extended optical fiber sleeve 62 so that the third optical fiber faces the tail end of the U-shaped outer sleeve and is perpendicular to the first U-shaped lens. The bottom end of the swing rod 7 is sleeved on the tail end of the extended optical fiber sleeve 62. The swing assembly includes a swing motor. The top end of the swing rod 7 is sleeved on the rotating shaft of the swing motor 71, and the rotating shaft is sleeved with bearing on both sides of the swing rod 7. When the extended optical fiber sleeve 62 swings, it swings along the tail end of the U-shaped outer sleeve;

[0045] The first optical fiber 6, the second optical fiber in the second optical fiber group, and the input ends of the third optical fiber are connected to the illumination optical system of the endoscope.

[0046] The moving mode of the third optical fiber assembly is arc-shaped. The lenses in the U-shaped lens group module 3 do not have Figures 3-5 the effect, but the movement of the third optical fiber assembly can be realized according to needs to achieve the same diffusion purpose. The swing rod 7 swings, causing the lengthened optical fiber sleeve 62 to swing along the tail end of the U-shaped outer sleeve.

[0047] The central positions of the two outer sleeves and the central position of the middle line of the U-shaped outer sleeve are sequentially connected to form an equilateral triangle. The length of the connection line between the central position of any one of the outer sleeves and the central position of the middle line of the U-shaped outer sleeve is 1.5 - 2.0 times the length of the connection line between the central positions of the two outer sleeves. A camera optical module 4 is provided in the space between the two outer sleeves and the U-shaped outer sleeve.

[0048] Ensure independent control of the upper half for left-right symmetry. Since the lenses in the U-shaped outer sleeve do not have Figures 3-5 the effect, its width is reduced to achieve Figure 4 the diffused light effect.

[0049] The outer side wall and the inner side wall of the U-shaped outer sleeve are both cylindrical walls, and the radian of both the outer side wall and the inner side wall is 120 - 145°. The distance between the outer side wall and the inner side wall of the U-shaped outer sleeve is 2 / 3 of the diameter of the outer sleeve.

[0050] The light adjustment range is to wrap the camera optical module 4. Due to light diffusion, there is no need for complete docking at the docking position, and a gap is left to facilitate filling glue to fix each component.

[0051] Both ends of the sleeve limit sleeve 5 are semi-cylindrical walls, and the middle is two parallel plates. The inner side wall of the semi-cylindrical wall matches the outer wall of the optical fiber sleeve 61. The distance between the two parallel plates is 0.5 - 0.8 mm larger than the diameter of the optical fiber sleeve 61. The length of the connection line between the middle positions at both ends of the sleeve limit sleeve 5 is equal to the diameter of the outer sleeve.

[0052] The optical fiber sleeve 61 is cylindrical, and both ends are semi-cylindrical walls that match it just right to be suitable for clamping when adjusting at both ends. The outer side wall of the sleeve limit sleeve 5 is fixed to the inner side wall of the endoscope outer sleeve through a connecting rod. The distance between the two parallel plates is 0.5 - 0.8 mm larger than the diameter of the optical fiber sleeve 61 to prevent over-tight clamping and the occurrence of inflexible movement.

[0053] The pulling mechanism includes a pull rod 9, a pulling lead screw 91, and a drive motor 8. The top end of the pull rod 9 movably penetrates through the middle of the semi-cylindrical wall at the bottom end of the sleeve limiting sleeve 5 and is fixed to the optical fiber sleeve 61. The pulling lead screw 91 spirally penetrates from the bottom end of the pull rod 9 into its interior. A first bevel gear disk 93 is sleeved at the bottom end of the pulling lead screw 91, and a stable bearing 92 is sleeved above the first bevel gear disk 93. A second bevel gear disk 82 is sleeved at the end of the rotating shaft of the drive motor 8, and a second stable bearing 81 is sleeved on the rotating shaft inside the second bevel gear disk 82. The first bevel gear disk 93 meshes with the second bevel gear disk 82.

[0054] The drive motor 8 (a micro servo motor) drives the second bevel gear disk 82 to rotate. After the first bevel gear disk 93 is driven to rotate, it drives the pulling lead screw 91 to pull the pull rod 9 to move up and down, thereby realizing the reciprocating movement of the optical fiber sleeve 61.

[0055] The sleeve limiting sleeve is inclined inward from top to bottom, and the included angle between the sleeve limiting sleeve and the vertical plane is 30°. This is to adjust the light provided by the following U-shaped outer sleeve at a better angle, with a higher degree of mutual matching ( Figures 9-11 During the movement process, it can well reflect the mutual cooperation of light).

[0056] The gaps between adjacent ones of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 are 3 - 5 mm, and the gaps between the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 are calculated based on the side planes. Leaving gaps facilitates a certain diffusion distance for the light between the lenses.

[0057] The first lens group module 1, the second lens group module 2, and the U-shaped lens group module 3 are sleeved by a sleeve. The gaps between the first lens group module 1, the second lens group module 2, and the U-shaped lens group module 3 and the gaps between them and the inner wall of the sleeve are filled with glue. Ensure that the ends are sealed with glue, without air leakage, and can also stabilize the positions of each component.

[0058] An electronic endoscope includes the above endoscopic illumination optical system, and further includes a camera optical module 4, an illumination optical system, and a control system. The camera optical module 4 is arranged at the spatial position between the first lens group module 1, the second lens group module 2, and the U-shaped lens group module 3. Both the camera optical module 4 and the illumination optical system are electrically connected to the control system. The first optical fiber assembly, the second optical fiber assembly, and the third optical fiber assembly in the endoscopic illumination optical system are all connected to the illumination optical system. The camera optical module 4, the illumination optical system, and the control system are all existing endoscopic configurations, and the main improvement point lies in the endoscopic illumination optical system.

[0059] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. An endoscope illumination optical system, characterized in that: It includes a first lens group module (1), a second lens group module (2), a U-shaped lens group module (3) and a light supply mechanism; The structure of the first lens group module (1) is the same as that of the second lens group module (2), and the two are arranged side by side. The first lens group module (1) includes an outer sleeve, and the outer sleeve is embedded with a first lens (11), a second lens (12), a third lens (13) and a fourth lens (14) arranged in sequence from the tail end to the front end. The rear sides of the first lens (11) and the third lens (13) are both spherical surfaces protruding outward, and both side surfaces of the second lens (12) are spherical surfaces concave inward. The sizes and areas of the spherical surface protruding outward and the spherical surface concave inward are the same. The rear side of the fourth lens is a semi-spherical surface concave inward. There are gaps between adjacent lenses of the first lens (11), the second lens (12), the third lens (13) and the fourth lens (14); The U-shaped lens group module (3) includes a U-shaped outer sleeve, and the U-shaped outer sleeve is embedded with a first U-shaped lens, a second U-shaped lens, a third U-shaped lens and a fourth U-shaped lens arranged in sequence from the tail end to the front end. The cross-sectional view of the U-shaped outer sleeve at any position perpendicular to its side wall is the same as the cross-sectional view of the lens in the outer sleeve; The light supply mechanism includes a first optical fiber assembly, a second optical fiber assembly and a third optical fiber assembly; The first optical fiber assembly and the second optical fiber assembly have the same structure and are symmetrically arranged. The first optical fiber assembly includes a first optical fiber (6), an optical fiber sleeve (61), a sleeve limit sleeve (5) and a pulling mechanism for pulling the optical fiber sleeve (61) to move within the sleeve limit sleeve (5). The end of the first optical fiber (6) is sleeved with the optical fiber sleeve (61) so that the first optical fiber (6) faces the tail end of the outer sleeve and is perpendicular to the first lens (11). Four sliding rods (611) are symmetrically arranged on both sides of the optical fiber sleeve (61). Four symmetrically parallel sliding grooves are provided on the inner side wall of the sleeve limit sleeve (5). The four sliding rods (611) are correspondingly arranged in the four sliding grooves. The second optical fiber group is arranged at the tail end of the second lens group module (2); The third optical fiber assembly includes a third optical fiber, an extended optical fiber sleeve (62), a swing rod (7) and a swing assembly. The end of the third optical fiber is sleeved with the extended optical fiber sleeve (62) so that the third optical fiber faces the tail end of the U-shaped outer sleeve and is perpendicular to the first U-shaped lens. The bottom end of the swing rod (7) is sleeved on the tail end of the extended optical fiber sleeve (62). The swing assembly includes a swing motor. The top end of the swing rod (7) is sleeved on the rotating shaft of the swing motor (71), and the rotating shaft is sleeved with bearing sleeves on both sides of the swing rod (7). When the extended optical fiber sleeve (62) swings, it swings along the tail end of the U-shaped outer sleeve; The first optical fiber (6), the second optical fiber in the second optical fiber group and the input end of the third optical fiber are connected to the illumination optical system of the endoscope.

2. The endoscopic illumination optical system according to claim 1, wherein: The central positions of the two outer sleeves are sequentially connected to the central position of the middle line of the U-shaped outer sleeve to form an equilateral triangle. The length of the connection line between the central position of any one of the outer sleeves and the central position of the middle line of the U-shaped outer sleeve is 1.5 - 2.0 times the length of the connection line between the central positions of the two outer sleeves. A camera optical module (4) is provided in the space between the two outer sleeves and the U-shaped outer sleeve.

3. An endoscopic illumination optical system according to claim 1, wherein: The outer side wall and the inner side wall of the U-shaped outer sleeve are both cylindrical walls, and the radian of the outer side wall and the inner side wall is 120 - 145°. The distance between the outer side wall and the inner side wall of the U-shaped outer sleeve is 2 / 3 of the diameter of the outer sleeve.

4. An endoscopic illumination optical system according to claim 1, characterized in that: Both ends of the sleeve limiting sleeve (5) are semi-cylindrical walls, and the middle is two parallel plates. The inner side wall of the semi-cylindrical wall matches the outer wall of the optical fiber sleeve (61). The distance between the two parallel plates is 0.5 - 0.8 mm larger than the diameter of the optical fiber sleeve (61). The length of the connection line between the middle positions at both ends of the sleeve limiting sleeve (5) is equal to the diameter of the outer sleeve.

5. An endoscopic illumination optical system according to claim 4, characterized in that: The pulling mechanism includes a pull rod (9), a pulling lead screw (91) and a driving motor (8). The top end of the pull rod (9) movably penetrates through the middle of the semi-cylindrical wall at the bottom end of the sleeve limiting sleeve (5) and is fixed on the optical fiber sleeve (61). The pulling lead screw (91) spirally penetrates from the bottom end of the pull rod (9) into its interior. A first bevel gear disc (93) is sleeved at the bottom end of the pulling lead screw (91), and a stable bearing (92) is sleeved above the first bevel gear disc (93). A second bevel gear disc (82) is sleeved at the end of the rotating shaft of the driving motor (8), and a second stable bearing (81) is sleeved on the rotating shaft inside the second bevel gear disc (82). The first bevel gear disc (93) meshes with the second bevel gear disc (82).

6. The endoscopic illumination optical system according to claim 1, wherein: The sleeve limiting sleeve inclines inward from the top to the bottom, and the included angle between the sleeve limiting sleeve and the vertical plane is 30°.

7. An endoscopic illumination optical system according to claim 1, wherein: The gaps between the adjacent first lens (11), second lens (12), third lens (13) and fourth lens (14) are 3 - 5 mm. The gaps between the first lens (11), second lens (12), third lens (13) and fourth lens (14) are calculated based on the side plane.

8. An endoscopic illumination optical system according to any one of claims 1-7, characterized in that: The first lens group module (1), the second lens group module (2) and the U-shaped lens group module (3) are sleeved by a sleeve. The gaps between the first lens group module (1), the second lens group module (2) and the U-shaped lens group module (3) and the gaps between them and the inner wall of the sleeve are filled with glue.

9. An electronic endoscope, characterized in that: An endoscope illumination optical system according to any one of claims 1 - 7 further includes a camera optical module (4), an illumination optical system and a control system. The camera optical module (4) is arranged at the spatial position between the first lens group module (1), the second lens group module (2) and the U-shaped lens group module (3). The camera optical module (4) and the illumination optical system are both electrically connected to the control system. The first optical fiber component, the second optical fiber component and the third optical fiber component in the endoscope illumination optical system are all connected to the illumination optical system.

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