Small-caliber high-definition hard endoscope

Abstract

The utility model discloses a small-caliber high-definition hard endoscope, which comprises an objective lens group, six rod lens groups and an eyepiece group which are sequentially arranged, the focal length range of the objective lens group is 2.5 mm-3. 5mm, the length range of the conjugate plane of the objective lens group is 45 mm-60 mm, the number of the rod lens groups is six, the focal length range of the rod lens groups is 80 mm-100 mm, and the focal length range of the eyepiece group is 80 mm-100 mm. The length range of a conjugate plane of the rod lens group is 100-120mm, the focal length range of the eyepiece group is 10-25mm, the length range of the eyepiece group is 30-37mm, the objective lens group, the rod lens group and the eyepiece group are all composed of a plurality of lenses, and the outer diameter range of the lenses is 3.17-6.16 mm. According to the scheme, the endoscope is composed of the lens with the small caliber, the lens can be fixedly installed conveniently, fixation is firm, and the lens cannot be damaged in the long-time using process.

Description

Technical Field

[0001] The utility model belongs to the technical field of endoscopes, and in particular relates to a small-caliber high-definition rigid endoscope. Background Art

[0002] Medical endoscopes are used in minimally invasive surgery and include hysteroscopes, laparoscopic endoscopes, and sinusoscopes. The core of a medical endoscope consists of an optical imaging system and the mechanical structure that supports this imaging process. The optical imaging system consists of an objective lens, a rod lens, and an eyepiece. The eyepiece is connected to a camera system, which captures the image information on the back-end image sensor and displays it on a monitor.

[0003] Chinese patent application number 2022109541888 discloses a high-resolution, large-field-of-view medical endoscope optical light path system. The system comprises, from the object side, an objective lens, a rod lens, and an eyepiece. The objective lens comprises, from the object side, a light-gathering structure and a convex-concave-convex objective lens focal length structure composed of a convex lens, a concave lens, and a convex lens. The rod lens comprises multiple groups of single lens groups arranged in sequence, and each group of single lens groups is bilaterally symmetrical. The left and right portions respectively comprise a convex-concave-convex point spread function reduction structure composed of a convex lens, a concave lens, and a convex lens. The eyepiece comprises a convex lens, a convex lens, and a concave lens to form a convex-convex-concave structure. The improved combination of the objective lens, rod lens, and eyepiece can improve various performances of the endoscope optical path system.

[0004] The above solution has the advantage of increasing the field of view, but like the rigid endoscopes in the prior art, the optical aperture of the endoscope is basically 6.5 mm, which is not convenient for installation. Utility Model Content

[0005] To solve the above problems, the utility model provides a small-aperture high-definition rigid endoscope, comprising an objective lens group, a rod lens group, and an eyepiece group arranged in sequence, the focal length range of the objective lens group is 2.5mm-3.5mm, the conjugate surface length range of the objective lens group is 45mm-60mm, the rod lens group is provided with six groups in total, the focal length range of the rod lens group is 80mm-100mm, the conjugate surface length range of the rod lens group is 100mm-120mm, the focal length range of the eyepiece group is 10mm-25mm, the length range of the eyepiece group is 30mm-37mm, the objective lens group, the rod lens group and the eyepiece group are all composed of a plurality of lenses, and the outer diameter range of the lenses is 3.17mm-6.16mm.

[0006] Preferably, the focal length of the objective lens group is 2.9195 mm, and the conjugate surface length of the objective lens group is 51.14 mm.

[0007] Preferably, the focal length of the rod lens group is 88.4 mm, and the conjugate surface length of the rod lens group is 110.3 mm.

[0008] Preferably, the focal length of the eyepiece assembly is 17.7 mm, and the length range of the eyepiece assembly is 36.8 mm.

[0009] Preferably, the objective lens group includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9. The second lens L2 and the third lens L3 are cemented together, the fourth lens L4 and the fifth lens L5 are cemented together, and the sixth lens L6, the seventh lens L7, and the eighth lens L8 are cemented together.

[0010] Preferably, the rod lens group includes a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13 and a fourteenth lens L14, the eleventh lens L11 and the twelfth lens L12 are cemented together, and the thirteenth lens L13 and the fourteenth lens L14 are cemented together.

[0011] Preferably, the eyepiece group includes a fifteenth lens L15, a sixteenth lens L16, a seventeenth lens L17, an eighteenth lens L18, a nineteenth lens L19 and a twentieth lens L20, the fifteenth lens L15 and the sixteenth lens L16 are cemented together, and the seventeenth lens L17, the eighteenth lens L18 and the nineteenth lens L19 are cemented together.

[0012] Preferably, a front protective glass is provided at the front end of the first lens L1, and a rear protective glass is provided at the rear end of the nineteenth lens L19.

[0013] The advantages of the utility model are:

[0014] 1. This solution utilizes a small-aperture lens to form the endoscope, facilitating secure installation and ensuring long-term protection from damage. The reduced outer diameter of the lens also reduces the overall diameter of the endoscope, enabling easier insertion through natural body cavities or minimally invasive surgical incisions. This small-aperture design significantly reduces surgical trauma, shortening patient pain and postoperative recovery time, thereby enhancing the patient's surgical experience and overall recovery.

[0015] 2. In this solution, the focal length range of the objective lens group is set to 2.5mm-3.5mm, and the conjugate surface length range is set to 45mm-60mm. This setting helps to improve the imaging quality, performance and optical design flexibility of medical endoscopes, while reducing the difficulty of processing and assembly as well as production costs.

[0016] 3. The focal length of the rod lens assembly in this solution ranges from 80mm to 100mm, and the conjugate length of the rod lens assembly ranges from 100mm to 120mm. As the relay component of the endoscopic imaging system, the rod lens assembly's longer focal length design helps optimize image quality. This long focal length reduces image distortion, improves image clarity and resolution, and enables surgeons to more accurately observe lesions during surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the overall structure diagram of the utility model.

[0018] In the figure: 1 objective lens group, 2 rod lens group, 3 eyepiece group, 4 front protective glass, 5 rear protective glass. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front end", "rear end", "two ends", "one end", "the other end", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0021] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a communication between the two elements. At the same time, when an element is referred to as "fixed on" or "provided on" another element, it can be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. When an element is referred to as being "fixedly connected to" another element, it can be a common fixed connection method such as welding, bolt connection, or gluing connection. In short, for ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] Example 1, as Figure 1As shown, a small-aperture high-definition rigid endoscope includes an objective lens group 1, a rod lens group 2, and an eyepiece group 3 arranged in sequence. The focal length range of the objective lens group 1 is 2.5mm-3.5mm, and the conjugate surface length range of the objective lens group 1 is 45mm-60mm. The purpose of setting the focal length range of the objective lens group 1 to 2.5mm-3.5mm in this embodiment is that the shorter focal length helps to capture more details in a limited space and improve the resolution of the image. This is particularly important for surgical operations that require fine observation. While maintaining a certain imaging quality, a shorter focal length can usually provide a wider field of view, allowing doctors to observe a wider area and reduce blind spots. The conjugate surface length range is set to 45mm-60mm, providing more flexibility for optical design. Designers can adjust the conjugate surface length within this range according to specific imaging needs and mechanical structure requirements to achieve the best imaging effect and performance. The shorter focal length and reasonable conjugate surface length help control the size and weight of the lens, making the lens processing and assembly easier. Preferably, the focal length of the objective lens group 1 is 2.9195 mm, and the conjugate surface length of the objective lens group 1 is 51.14 mm.

[0023] Specifically, objective lens assembly 1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9, arranged in sequence. Second lens L2 and third lens L3 are cemented together, fourth lens L4 and fifth lens L5 are cemented together, and sixth lens L6, seventh lens L7, and eighth lens L8 are cemented together. First lens L1 and ninth lens L9 are aspherical lenses, and the remaining lenses are spherical lenses.

[0024] The focal length of the rod lens assembly 2 ranges from 80mm to 100mm, and the conjugate surface length of the rod lens assembly 2 ranges from 100mm to 120mm. Preferably, the focal length of the rod lens assembly 2 is 88.4mm, and the conjugate surface length of the rod lens assembly 2 is 110.3mm. As the relay part of the endoscopic imaging system, the rod lens assembly 2 has a focal length range of 80mm to 100mm. The longer focal length design helps optimize imaging quality. The long focal length can reduce imaging distortion, improve image clarity and resolution, and enable doctors to more accurately observe the lesion area during surgery. The appropriate extension of the conjugate surface length provides more flexibility in optical design, helping to optimize the light transmission path and imaging effect. This helps ensure that the image maintains high imaging quality throughout the entire field of view. The conjugate surface length ranges from 100mm to 120mm. The appropriate extension of the conjugate surface length provides more flexibility in optical design, helping to optimize the light transmission path and imaging effect. This helps ensure that the image maintains high imaging quality throughout the entire field of view. The focal length and conjugate plane length within the above range help reduce aberrations in the imaging process, such as spherical aberration, coma, etc. The reduction of these aberrations can further improve the clarity and accuracy of the image, providing doctors with more reliable diagnosis basis.

[0025] Specifically, in this embodiment, the rod lens group 2 includes a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, and a fourteenth lens L14 arranged in sequence. The eleventh lens L11 and the twelfth lens L12 are cemented together, and the thirteenth lens L13 and the fourteenth lens L14 are cemented together.

[0026] In this embodiment, the focal length range of the eyepiece assembly 3 is 10mm-25mm, and the length range of the eyepiece assembly 3 is 30mm-37mm. Preferably, the focal length of the eyepiece assembly 3 is 17.7mm, and the length range of the eyepiece assembly 3 is 36.8mm. Setting the focal length range to 10mm-25mm not only ensures sufficient magnification but also takes into account the width of the field of view, making it suitable for a variety of observation tasks and achieving a good balance. The length range of the eyepiece assembly 3 is set to 30mm-37mm. This range ensures the compactness of the eyepiece assembly 3, helps reduce the volume and weight of the entire optical system, and improves portability. At the same time, setting the length to 36.8mm as the preferred value is based on the fact that at this length, the layout of the optical elements is more reasonable, which can better control aberrations and improve image quality. In addition, the shorter length also helps to reduce light loss during transmission and improve optical efficiency. By reasonably setting the focal length and length, this solution not only ensures good observation results, but also takes into account the compactness and portability of the optical system.

[0027] Specifically, in this embodiment, the eyepiece assembly 3 includes a fifteenth lens L15, a sixteenth lens L16, a seventeenth lens L17, an eighteenth lens L18, a nineteenth lens L19, and a twentieth lens L20, arranged in sequence. The fifteenth lens L15 and the sixteenth lens L16 are cemented together, and the seventeenth lens L17, the eighteenth lens L18, and the nineteenth lens L19 are cemented together. A front protective glass 4 is provided at the front end of the first lens L1. A rear protective glass 5 is provided at the rear end of the eighteenth lens L18.

[0028] In this embodiment, the outer diameter of all lenses ranges from 3.17mm to 6.16mm, and the optical aperture of the lens is reduced to within the range of 3.17mm to 6.16mm, which is conducive to the fixed installation of the endoscope, and the fixation is firm and can not be damaged for a long time. The reduction in the outer diameter of the lens reduces the overall diameter of the endoscope accordingly, so that it can more easily enter the body through the natural cavity of the human body or minimally invasive surgical incision. This small-caliber design significantly reduces surgical trauma, reduces the patient's pain and postoperative recovery time, and improves the patient's surgical experience and rehabilitation effect. This solution achieves higher image clarity by precisely designing the focal length and conjugate surface length of the objective lens group 1, the rod lens group 2 and the eyepiece group 3, and adopting a combination of multiple groups of lenses. This helps doctors observe the lesion area more clearly during surgery, improving surgical accuracy and success rate.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small-caliber high-definition rigid endoscope, characterized by: The invention comprises an objective lens group, a rod lens group and an eyepiece group arranged in sequence. The focal length range of the objective lens group is 2.5mm-3.5mm, the conjugate surface length range of the objective lens group is 45mm-60mm, and there are six rod lens groups in total. The focal length range of the rod lens group is 80mm-100mm, the conjugate surface length range of the rod lens group is 100mm-120mm, the focal length range of the eyepiece group is 10mm-25mm, and the length range of the eyepiece group is 30mm-37mm. The objective lens group, the rod lens group and the eyepiece group are all composed of a plurality of lenses, and the outer diameter range of the lenses is 3.17mm-6.16mm.

2. The small-caliber high-definition rigid endoscope according to claim 1, characterized in that: The focal length of the objective lens group is 2.9195 mm, and the conjugate surface length of the objective lens group is 51.14 mm.

3. The small-caliber high-definition rigid endoscope according to claim 2, characterized in that: The focal length of the rod mirror set is 88.4 mm, and the conjugate surface length of the rod mirror set is 110.3 mm.

4. The small-caliber high-definition rigid endoscope according to claim 3, characterized in that: The focal length of the eyepiece assembly is 17.7 mm, and the length range of the eyepiece assembly is 36.8 mm.

5. The small-caliber high-definition rigid endoscope according to claim 4, characterized in that: The objective lens group includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9. The second lens L2 and the third lens L3 are cemented together, the fourth lens L4 and the fifth lens L5 are cemented together, and the sixth lens L6, the seventh lens L7, and the eighth lens L8 are cemented together.

6. The small-caliber high-definition rigid endoscope according to claim 5, characterized in that: The rod lens group includes a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13 and a fourteenth lens L14. The eleventh lens L11 and the twelfth lens L12 are cemented together, and the thirteenth lens L13 and the fourteenth lens L14 are cemented together.

7. The small-caliber high-definition rigid endoscope according to claim 6, characterized in that: The eyepiece group includes a fifteenth lens L15, a sixteenth lens L16, a seventeenth lens L17, an eighteenth lens L18, a nineteenth lens L19 and a twentieth lens L20. The fifteenth lens L15 and the sixteenth lens L16 are cemented together, and the seventeenth lens L17, the eighteenth lens L18 and the nineteenth lens L19 are cemented together.

8. The small-caliber high-definition rigid endoscope according to claim 7, characterized in that: A front protective glass is provided at the front end of the first lens L1 , and a rear protective glass is provided at the rear end of the nineteenth lens L19 .

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