Endoscope objective lens, endoscope, and endoscope system

Abstract

The invention relates to an endoscope objective lens. The endoscope objective lens sequentially comprises a first lens and a first balsaming lens from an object plane to an image plane. The first bonding lens moves on the optical axis of the endoscope objective lens, so that the difference between the focal length of the first bonding lens in the endoscope objective lens and the value of the movement of the first bonding lens on the optical axis of the endoscope objective lens is between 15.00 and 35.00; according to the invention, the focal length of the first balsaming lens and the distance of far and near focus switching of the first balsaming lens can be properly proportioned, the aberration correction and the tolerance sensitivity of the moving group are facilitated, the total length is short, the length of the hard part of the whole endoscope is reduced, the observation depth of the endoscope can be improved, and the service life of the endoscope is prolonged. A good image observed in a close range is ensured, and the accuracy of observation and information acquisition of the endoscope is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of endoscopes, and in particular to an endoscope objective lens, an endoscope, and an endoscope system. Background Art

[0002] As endoscope technology is widely used in the medical field, images of various parts of the body cavity are usually obtained by inserting an endoscope into the body cavity to observe and diagnose the lesions. In traditional technology, in order to make precise diagnosis of abnormal areas, it is expected that the endoscope has good imaging quality, high pixels and clear image quality, and the imaging quality within the depth of field is good, which is conducive to better obtaining abnormal information of abnormal areas; at the same time, it is also expected that the endoscope has a wider field of view, improves the observation range, and is conducive to shortening the inspection time. Therefore, when using an endoscope for observation, it is expected to obtain a focused image in a large range from near point to far point during observation. Some traditional technologies adjust the aperture value (F number), and some traditional technologies use zoom (focusing) to improve the imaging quality of the endoscope at far and near focus. However, the endoscope of traditional technology still has the defects of wide field of view, chromatic aberration correction, and system tolerance sensitivity that are not well balanced, resulting in low accuracy of endoscopic observation and information acquisition. Summary of the invention

[0003] Based on this, it is necessary to overcome the defects of the prior art and provide an endoscope objective lens, which has a wide field of view, good chromatic aberration correction, good tolerance sensitivity and meets the needs of close-range observation, can effectively improve the accuracy of endoscope observation and information acquisition, and reducing the CHA length can effectively reduce the length of the hard part of the endoscope.

[0004] The technical solution is as follows: an endoscope objective lens, the endoscope objective lens comprises, from the object plane to the image plane, a first lens and a first cemented lens; the first cemented lens is movable along the optical axis of the endoscope objective lens, so that the endoscope objective lens satisfies the following conditional formula:

[0005] 15.00 <Fm / D<35.00

[0006] Wherein, Fm is the focal length of the first cemented lens; and D is the value of the first cemented lens that can be moved along the optical axis of the endoscope objective lens.

[0007] The above-mentioned endoscope objective lens includes, from the object plane to the image plane, in sequence: a first lens and a first cemented lens; the first cemented lens moves on the optical axis of the endoscope objective lens, so that the difference between the focal length of the first cemented lens in the endoscope objective lens and the numerical value of the movement of the first cemented lens on the optical axis of the endoscope objective lens is between 15.00 and 35.00, which can make the focal length of the first cemented lens and the distance of the first cemented lens switching between far and near focus in an appropriate ratio, which is beneficial to the correction of aberrations and the tolerance sensitivity of the moving group, and the overall length is short, which is beneficial to reducing the length of the entire hard part of the endoscope, and at the same time can increase the observation depth of the endoscope, ensure good images for close-range observation, and effectively improve the accuracy of endoscope observation and information acquisition.

[0008] In one of the embodiments, on the side of the first cemented lens close to the image plane, the endoscope objective lens also includes a lens imaging combination.

[0009] In one embodiment, the lens imaging combination includes a fourth lens; the fourth lens has a positive optical focal length, and the convex surface of the fourth lens faces the image plane; the fourth lens and the endoscope objective lens satisfy the following conditional formula:

[0010] 0.50 <F4 / Fa<3.50

[0011] Among them, F4 is the focal length of the fourth lens; Fa is the total focal length of the endoscope objective lens when it is at a far focus.

[0012] In one embodiment, the lens imaging combination includes a fourth lens; the fourth lens has positive optical power, and the convex surface of the fourth lens faces the image plane;

[0013] The first cemented lens has positive focal power; the first cemented lens and the fourth lens satisfy the following conditional formula:

[0014] 1.00 <Fm / F4<7.50。

[0015] In one embodiment, the lens imaging combination includes a fourth lens; on the image plane side of the fourth lens, the lens imaging combination also includes a second cemented lens; the second cemented lens has positive focal power; the second cemented lens and the fourth lens satisfy the following conditional formula:

[0016] -30.00 <Fn / F4<20.00

[0017] The Fn is the focal length of the second cemented lens.

[0018] In one embodiment, the lens imaging combination includes a fourth lens; on the image plane side of the fourth lens, the lens imaging combination also includes a second cemented lens; the second cemented lens includes a fifth lens and a sixth lens in sequence from the object plane to the image plane, the fifth lens has a positive or negative optical focal power and one of the sixth lens has a positive optical focal power and the other has a negative optical focal power, or the fifth lens has a positive or negative optical focal power and one of the sixth lens has a negative optical focal power and the other has a positive optical focal power.

[0019] In one embodiment, the first cemented lens includes a second lens and a third lens in sequence from the object plane to the image plane, the second lens has positive or negative optical power, and the third lens has positive or negative optical power.

[0020] In one embodiment, when one of the fifth lens and the sixth lens has a positive optical power and the other has a negative optical power, the refractive indexes of the fifth lens and the sixth lens satisfy the following conditional formula:

[0021] -0.50 <Nd4-Nd5<0.50;

[0022] Wherein, Nd4 is the refractive index of the lens with negative optical power among the fifth lens and the sixth lens; and Nd5 is the refractive index of the lens with positive optical power among the fifth lens and the sixth lens.

[0023] In one embodiment, when one of the fifth lens and the sixth lens has a positive optical power and the other has a negative optical power, the Abbe numbers of the fifth lens and the sixth lens satisfy the following conditional formula:

[0024] -50.0 <Vd4-Vd5<-15.0;

[0025] Wherein, the Vd4 is the Abbe number of the lens with negative optical power among the fifth lens and the sixth lens; and the Vd5 is the Abbe number of the lens with positive optical power among the fifth lens and the sixth lens.

[0026] In one embodiment, when one of the second lens and the third lens has a positive optical power and the other has a negative optical power, the refractive indexes of the second lens and the third lens satisfy the following conditional formula:

[0027] -0.50 <Nd2-Nd3<0.00;

[0028] Wherein, Nd2 is the refractive index of the lens with negative optical power among the second lens and the third lens; and Nd3 is the refractive index of the lens with negative optical power among the second lens and the third lens.

[0029] In one embodiment, when one of the second lens and the third lens has a positive optical power and the other has a negative optical power, the Abbe numbers of the second lens and the third lens satisfy the following conditional formula:

[0030] 5.00 <Vd2-Vd3<35.00;

[0031] Wherein, Vd2 is the Abbe number of the lens with negative optical power among the second lens and the third lens; Vd3 is the Abbe number of the lens with negative optical power among the second lens and the third lens.

[0032] In one embodiment, the lens imaging combination includes a fourth lens; on the image plane side of the fourth lens, the lens imaging combination also includes a second cemented lens; the second cemented lens includes a fifth lens and a sixth lens in sequence from the object plane to the image plane; on the image plane side of the sixth lens, the lens imaging combination also includes an infrared filter and a chip protection glass in sequence from the object plane to the image plane; a laser cutoff film is attached to at least one side of the infrared filter.

[0033] In one embodiment, the lens imaging combination includes a fourth lens, between the object of the fourth lens and the first cemented lens, and the lens imaging combination also includes an aperture.

[0034] In one embodiment, the first lens has negative optical power.

[0035] In one embodiment, an endoscope includes an endoscope objective.

[0036] In one embodiment, an endoscope system includes: a light source device, an imaging device, and an endoscope.

[0037] In the above-mentioned endoscope objective lens, the endoscope objective lens includes, from the object plane to the image plane, in sequence: a first lens and a first cemented lens; the first cemented lens moves on the optical axis of the endoscope objective lens, so that the difference between the focal length of the first cemented lens in the endoscope objective lens and the numerical value of the first cemented lens moving on the optical axis of the endoscope objective lens is between 15.00 and 35.00, which can make the focal length of the first cemented lens and the distance of the first cemented lens switching between far and near focus in an appropriate ratio, which is beneficial to the correction of aberrations and the tolerance sensitivity of the moving group, and the overall length is short, which is beneficial to reducing the length of the entire hard part of the endoscope, and at the same time can increase the observation depth of the endoscope, ensure good images for close-range observation, and effectively improve the accuracy of observation and information acquisition of the endoscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a first embodiment of the present invention;

[0041] Figure 2 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the first embodiment of the present invention;

[0042] Figure 3 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the first embodiment of the present invention;

[0043] Figure 4 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the first embodiment of the present invention;

[0044] Figure 5 is a schematic structural diagram showing a close focus of an endoscope lens according to a first embodiment of the present invention;

[0045] Figure 6 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at close focus according to the first embodiment of the present invention;

[0046] Figure 7 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the first embodiment of the present invention;

[0047] Figure 8 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at near focus according to the first embodiment of the present invention;

[0048] Fig. 9 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a second embodiment of the present invention;

[0049] Fig.10 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the second embodiment of the present invention;

[0050] Fig.11 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the second embodiment of the present invention;

[0051] Fig.12 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the second embodiment of the present invention;

[0052] Fig.13 is a schematic structural diagram showing a close focus of an endoscope lens according to a second embodiment of the present invention;

[0053] Fig.14 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at close focus according to the second embodiment of the present invention;

[0054] Fig.15 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the second embodiment of the present invention;

[0055] Fig.16 is a diagram schematically showing astigmatism and distortion of an endoscope lens at near focus according to a second embodiment of the present invention;

[0056] Fig.17 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a third embodiment of the present invention;

[0057] Fig.18 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the third embodiment of the present invention;

[0058] Fig.19 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the third embodiment of the present invention;

[0059] Fig. 20 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the third embodiment of the present invention;

[0060] Fig.21 is a schematic structural diagram showing a close focus of an endoscope lens according to a third embodiment of the present invention;

[0061] Fig. 22 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at close focus according to the third embodiment of the present invention;

[0062] Fig.23 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the third embodiment of the present invention;

[0063] Fig.24 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at near focus according to the third embodiment of the present invention;

[0064] Fig.25 is a schematic structural diagram showing the telefocus of an endoscope lens according to a fourth embodiment of the present invention;

[0065] Fig.26 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the fourth embodiment of the present invention;

[0066] Fig. 27 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the fourth embodiment of the present invention;

[0067] Fig.28 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the fourth embodiment of the present invention;

[0068] Fig.29 is a schematic structural diagram showing a close focus of an endoscope lens according to a fourth embodiment of the present invention;

[0069] Fig.30 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at near focus according to the fourth embodiment of the present invention;

[0070] Fig.31 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the fourth embodiment of the present invention;

[0071] Fig.32 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at near focus according to the fourth embodiment of the present invention;

[0072] Fig.33 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a fifth embodiment of the present invention;

[0073] Fig.34 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the fifth embodiment of the present invention;

[0074] Fig.35 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the fifth embodiment of the present invention;

[0075] Fig.36 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the fifth embodiment of the present invention;

[0076] Fig.37 is a schematic structural diagram showing a close focus of an endoscope lens according to a fifth embodiment of the present invention;

[0077] Fig.38 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at close focus according to the fifth embodiment of the present invention;

[0078] Fig.39 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the fifth embodiment of the present invention;

[0079] Fig.40 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at near focus according to the fifth embodiment of the present invention;

[0080] Fig.41 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a sixth embodiment of the present invention;

[0081] Fig.42 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the sixth embodiment of the present invention;

[0082] Fig.43 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the sixth embodiment of the present invention;

[0083] Fig.44 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the sixth embodiment of the present invention;

[0084] Fig.45 is a schematic diagram showing the structure of the close focus of an endoscope lens according to a sixth embodiment of the present invention;

[0085] Fig.46 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at close focus according to the sixth embodiment of the present invention;

[0086] Fig.47 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the sixth embodiment of the present invention;

[0087] Fig.48 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at near focus according to the sixth embodiment of the present invention;

[0088] Fig.49 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a seventh embodiment of the present invention;

[0089] Fig.50 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the seventh embodiment of the present invention;

[0090] Fig.51 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the seventh embodiment of the present invention;

[0091] Fig.52 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the seventh embodiment of the present invention;

[0092] Fig.53 is a schematic diagram showing the structure of the endoscope lens close focus according to the seventh embodiment of the present invention;

[0093] Fig.54 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at near focus according to the seventh embodiment of the present invention;

[0094] Fig.55 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the seventh embodiment of the present invention;

[0095] Fig.56 Schematically shows the astigmatism and distortion of the endoscope lens at near focus according to the seventh embodiment of the present invention.

[0096] Among them, there are an endoscope objective lens 100, a first lens 110, a first cemented lens 120, a lens imaging combination 130, a second lens 121, a third lens 122, an aperture 131, a fourth lens 132, a fifth lens 133, a sixth lens 134, an infrared filter 135, a chip protection glass 136, and an imaging screen 137. DETAILED DESCRIPTION

[0097] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0098] In order to make precise diagnosis of abnormal areas in traditional technology, the endoscope is expected to have good imaging quality, high pixels and clear image quality, and the imaging quality within the depth of field is good, which is conducive to better obtaining abnormal information of abnormal areas; at the same time, the endoscope is also expected to have a wider field of view to increase the observation range, which is conducive to shortening the inspection time. Therefore, when using an endoscope for observation, it is expected to obtain a focused image in a large range from near point to far point during observation. Some traditional technologies adjust the aperture value F number, and some traditional technologies use zoom focusing to improve the imaging quality of the endoscope at near and far focal points. However, endoscopes with traditional technology still have defects such as wide field of view, chromatic aberration correction, and system tolerance sensitivity that are not well balanced, resulting in low accuracy of endoscopic observation and information acquisition. The endoscope objective lens 100 of the present application includes, from the object plane to the image plane, in sequence: a first lens 110 and a first cemented lens 120; the first cemented lens 120 is movable along the optical axis of the endoscope objective lens 100, so that the difference between the focal length of the first cemented lens 120 in the endoscope objective lens 100 and the value of the first cemented lens 120 being movable along the optical axis of the endoscope objective lens 100 is between 15.00 and 35.00, which can make the focal length of the first cemented lens 120 and the distance of the first cemented lens 120 switching between far and near focus in an appropriate ratio, which is beneficial to the correction of aberrations and the tolerance sensitivity of the moving group, and the overall length is short, which is beneficial to reducing the length of the entire hard part of the endoscope, and at the same time can increase the observation depth of the endoscope, ensure good images for close-range observation, and effectively improve the accuracy of observation and information acquisition of the endoscope.

[0099] In one embodiment, Figure 1 Schematically shows the structure of the endoscope lens far focus according to the first embodiment of the present invention; Figure 1 It can be obtained that the endoscope objective lens 100 includes, from the object plane to the image plane, a first lens 110 and a first cemented lens 120; the first cemented lens 120 can move along the optical axis of the endoscope objective lens 100, so that the endoscope objective lens 100 satisfies the following conditional formula:

[0100] 15.00 <Fm / D<35.00

[0101] Among them, Fm is the focal length of the first cemented lens 120; D is the value of the first cemented lens 120 that can be moved along the optical axis in the endoscope objective lens 100. In general, the value of the first cemented lens 120 that can be moved along the optical axis in the endoscope objective lens 100 is the distance for switching between far focus and near focus.

[0102] Specifically, in the endoscope objective lens 100 system, after light is transmitted from the object plane, it first passes through the first lens 110 and then passes through the first cemented lens 120. By moving the first cemented lens 120 on the optical axis, its focal length can be adjusted. When the movement value of the first cemented lens 120 on the optical axis changes, the focal length will also be adjusted accordingly, so that the difference of the change is maintained between 15.00 and 35.00. If it exceeds the lower limit, the movement amount of the moving group will increase, resulting in a larger total length of the endoscope system, which is not conducive to reducing the length of the hard part, affecting clinical use, and at the same time, the image quality of the near point deteriorates; if it exceeds the upper limit, the focal length of the cemented lens is reduced, resulting in a larger optical focal length, and the tolerance sensitivity of the moving group group is poor, resulting in poor image quality during the switching process between far and near focus, and the correction of chromatic aberration is difficult, and high-resolution images cannot be obtained, thereby achieving precise imaging adjustment and optimization. This design ensures that the endoscope can obtain clear and stable images under different operating conditions.

[0103] Therefore, in the above-mentioned endoscope objective lens 100, the endoscope objective lens 100 includes, from the object plane to the image plane, a first lens 110 and a first cemented lens 120; the first cemented lens 120 is movable along the optical axis of the endoscope objective lens 100, so that the difference between the focal length of the first cemented lens 120 in the endoscope objective lens 100 and the value of the first cemented lens 120 being movable along the optical axis of the endoscope objective lens 100 is between 15.00 and 35.00, which can make the focal length of the first cemented lens 120 and the distance of the first cemented lens 120 switching between far and near focus in an appropriate ratio, which is beneficial to the correction of aberrations and the tolerance sensitivity of the moving group, and the total length is short, which is beneficial to reducing the length of the entire hard part of the endoscope, and at the same time can increase the observation depth of the endoscope, ensure good images for close-range observation, and effectively improve the accuracy of observation and information acquisition of the endoscope.

[0104] In one embodiment, continue as Figure 1 It is a schematic diagram showing the structure of the endoscope lens far focus according to the first embodiment of the present invention; on the side of the first cemented lens 120 close to the image plane, the endoscope objective 100 also includes a lens imaging group 130.

[0105] Specifically, in the endoscope objective lens 100, after light enters from the object plane, it first passes through the first lens 110, then passes through the first cemented lens 120, and a lens imaging group 130 is added on the side of the first cemented lens 120 close to the image plane. This design adjusts the focal length by moving the first cemented lens 120 on the optical axis, and the lens imaging group 130 further optimizes the imaging quality, ensuring that the light transmission and focusing during the imaging process are more accurate, thereby achieving high-quality image output.

[0106] In this embodiment, by adding a lens imaging group 130 on the side of the first cemented lens 120 close to the image plane, the endoscope objective lens 100 can better correct aberrations and improve imaging quality. At the same time, the accuracy of focal length adjustment is maintained during the movement of the optical axis, so that the endoscope can provide clear, stable and high-resolution images under various operating conditions, thereby improving the accuracy and effectiveness of diagnosis and operation.

[0107] In one embodiment, continuing as Figure 1 is a schematic structural diagram showing the telephoto of the endoscope lens according to the first embodiment of the present invention; the lens imaging group 130 includes a fourth lens 132; the fourth lens 132 has a positive optical power, and the convex surface of the fourth lens 132 faces the image plane; the following conditional formula is satisfied between the fourth lens 132 and the endoscope objective lens 100:

[0108] 0.50 < F4 / Fa < 3.50

[0109] Wherein, F4 is the focal length of the fourth lens 132; Fa is the total focal length of the endoscope objective lens 100 at telephoto.

[0110] Specifically, in the endoscope objective lens 100 system, after the light rays enter from the object plane, they first pass through the first lens 110, then through the first cemented lens 120, and a lens imaging group 130 is added on the side of the first cemented lens 120 close to the image plane. The lens imaging group 130 includes a fourth lens 132 with a positive optical power, and the convex surface of the fourth lens 132 faces the image plane. To ensure imaging quality, the relationship 0.50 < F4 / Fa < 3.50 is satisfied between the focal length F4 of the fourth lens 132 and the total focal length Fa of the endoscope objective lens 100 at telephoto. This design optimizes and controls the imaging process by adjusting the positions and characteristics of the optical elements.

[0111] In this embodiment, by adding a fourth lens 132 with a positive optical power and a convex surface facing the image plane in the lens imaging group 130, and making the ratio of its focal length to the total focal length of the endoscope objective lens 100 satisfy between 0.50 and 3.50, the endoscope objective lens 100 can effectively correct aberrations and optimize imaging quality. This not only improves the clarity and resolution of the image, but also enhances the flexibility and stability of the system, enabling the endoscope to provide high-quality images under various operating conditions, thereby improving the accuracy and reliability of diagnosis and operation.

[0112] In one embodiment, continuing as Figure 1It is a schematic structural diagram showing the telephoto of the endoscope lens according to the first embodiment of the present invention; when the first lens 110 has a negative optical power, the lens imaging group 130 includes a fourth lens 132; the fourth lens 132 has a positive optical power, and the convex surface of the fourth lens 132 faces the image plane; the following conditional formula is satisfied between the fourth lens 132 and the endoscope objective 100:

[0113] 0.50 < F4 / Fa < 3.50

[0114] Wherein, F4 is the focal length of the fourth lens 132; Fa is the total focal length of the endoscope objective 100 at telephoto.

[0115] Specifically, the first lens 110 is designed to have a negative optical power to achieve a specific optical adjustment effect. Then, a lens imaging group 130 is added to the endoscope objective 100, which includes a fourth lens 132 with a positive optical power. To ensure the imaging quality, the convex surface of the fourth lens 132 should face the image plane, and the optical conditional formula 0.50 < F4 / Fa < 3.50 needs to be satisfied, that is, the ratio of the focal length F4 of the fourth lens 132 to the total focal length Fa of the endoscope objective 100 at telephoto should be within this range. This design process ensures that the endoscope objective has excellent imaging performance and focal length control ability at telephoto.

[0116] In this embodiment, by designing the first lens 110 with a negative optical power and the fourth lens 132 with a positive optical power in the endoscope objective, ensuring that the convex surface of the fourth lens 132 faces the image plane, and satisfying the conditional formula 0.50 < F4 / Fa < 3.50, the imaging quality of the endoscope can be effectively optimized. This design can not only receive large-field incident light into the optical system, which is beneficial to increasing the field angle of the endoscope objective and ensuring the thinning of the front port diameter, is beneficial to the correction of lateral chromatic aberration, but also improves the imaging clarity and contrast, and can provide more accurate and stable focal length control under telephoto conditions, thereby enhancing the overall performance and applicability of the endoscope, especially in complex clinical application scenarios.

[0117] In one embodiment, continue as Figure 1 It is a schematic structural diagram showing the telephoto of the endoscope lens according to the first embodiment of the present invention; the first cemented lens 120 has a positive optical power; the following conditional formula is satisfied between the first cemented lens 120 and the fourth lens 132:

[0118] 1.00 < Fm / F4 < 7.50.

[0119] Specifically, in the endoscope objective lens 100 system, the first cemented lens 120 has a positive optical power, and the relationship 1.00 < Fm / F4 < 7.50 is satisfied between its focal length Fm and the focal length F4 of the fourth lens 132 in the lens imaging group 130. This design ensures that when the first cemented lens 120 is moved on the optical axis, the adjustment of the focal length can be coordinated with the optical characteristics of the fourth lens 132, thereby achieving the best imaging effect.

[0120] In this embodiment, by satisfying the conditional formula such that the focal lengths of the first cemented lens 120 and the fourth lens 132 fall within an appropriate ratio, it is beneficial for the correction of the diaphragm 131 aberration and the tolerance sensitivity of the moving group; if it exceeds the lower limit, the correction of the diaphragm 131 aberration is insufficient, and the optimization difficulty of the lens behind the diaphragm 131 increases; if it exceeds the upper limit, the correction of the diaphragm 131 aberration is excessive, and the tolerance sensitivity of the moving group is poor, resulting in poor image quality during the far and near focus switching process and unable to obtain high-resolution images; further, this embodiment ensures that the ratio between the focal length of the first cemented lens 120 and the focal length of the fourth lens 132 satisfies the relationship between 1.00 and 7.50, and the endoscope objective lens 100 system can better correct aberrations and optimize the imaging quality. This design improves the clarity and stability of the image, enables the endoscope to provide high-quality images under various operating conditions, and enhances the accuracy and reliability of diagnosis and operation.

[0121] In one embodiment, continue as Figure 1 is a schematic structural diagram showing the far focus of the endoscope lens according to the first embodiment of the present invention; when the first cemented lens 120 has a positive optical power, the second lens 121 has a positive or negative optical power, and the third lens 122 has a positive or negative optical power, the following conditional formula is satisfied between the first cemented lens 120 and the fourth lens 132:

[0122] 1.00 < Fm / F4 < 7.50

[0123] In this embodiment, the appropriate ratio of the focal length of the first cemented lens 120 and the focal length of the fourth lens 132 is beneficial for the correction of the diaphragm aberration and the tolerance sensitivity of the moving group; if it exceeds the lower limit, the correction of the diaphragm aberration is insufficient, and the optimization difficulty of the lens behind the diaphragm increases; if it exceeds the upper limit, the correction of the diaphragm aberration is excessive, and the tolerance sensitivity of the moving group is poor, resulting in poor image quality during the far and near focus switching process and unable to obtain high-resolution images.

[0124] In one embodiment, continue as Figure 1It is a schematic structural diagram showing the telephoto of the endoscope lens according to the first embodiment of the present invention; the lens imaging combination 130 includes a fourth lens 132; on the image side of the fourth lens 132, the lens imaging combination 130 further includes a second cemented lens; the second cemented lens has a positive optical power; the following conditional formula is satisfied between the second cemented lens and the fourth lens 132:

[0125] -30.00 < Fn / F4 < 20.00

[0126] Fn is the focal length of the second cemented lens.

[0127] Specifically, in the endoscope objective lens 100 system, a second cemented lens with a positive optical power is added on the image side of the fourth lens 132. The relationship between the focal length Fn of the second cemented lens and the focal length F4 of the fourth lens 132 satisfies -30.00 < Fn / F4 < 20.00. This design ensures that the imaging process after the fourth lens 132 can continue to optimize the focusing and transmission of light, thereby achieving high-quality imaging effects.

[0128] In this embodiment, by satisfying that the focal length of the second cemented lens and the focal length of the fourth lens 132 fall into an appropriate ratio in the conditional formula, it is beneficial to correct the aberration, chromatic aberration, and field curvature of the diaphragm 131 and reduce the total length of the endoscope system; if it exceeds the lower limit, the aberration correction of the diaphragm 131 is insufficient, and at the same time, the field curvature of the optical system cannot be well corrected; if it exceeds the upper limit, the aberration correction of the diaphragm 131 is excessive, and it is not conducive to the correction of chromatic aberration. In addition, the aberration generated in front of the diaphragm 131 cannot be well balanced, and at the same time, the total length of the optical system becomes longer, which is not conducive to the use of clinical products; further, a second cemented lens is added on the image side of the fourth lens 132, and it is ensured that the ratio between its focal length and the focal length of the fourth lens 132 satisfies the relationship between -30.00 and 20.00. The endoscope objective lens 100 system can further correct aberrations and improve imaging quality. This design not only enhances the clarity and stability of the image but also expands the applicable range of the system, enabling the endoscope to provide high-quality images under various operating conditions, thereby improving the accuracy and reliability of diagnosis and operation.

[0129] In one embodiment, continue as Figure 1 It is a schematic structural diagram showing the telephoto of the endoscope lens according to the first embodiment of the present invention; when the fifth lens 133 has a positive or negative optical power and the sixth lens 134 has a positive or negative optical power, the second cemented lens has a positive optical power; the following conditional formula is satisfied between the second cemented lens and the fourth lens 132:

[0130] -30.00 < Fn / F4 < 20.00

[0131] Fn is the focal length of the second cemented lens.

[0132] In this embodiment, an appropriate ratio between the focal length of the second cemented lens and the focal length of the fourth lens 132 is beneficial to the correction of aperture aberration, chromatic aberration, field curvature and the reduction of the total length of the endoscope system; if it exceeds the lower limit, the aperture aberration is insufficiently corrected and the field curvature of the optical system cannot be well corrected; if it exceeds the upper limit, the aperture aberration is over-corrected and is not conducive to the correction of chromatic aberration. In addition, the aberration generated in front of the aperture cannot be well balanced and the total length of the optical system becomes longer, which is not conducive to the use of clinical products.

[0133] In one embodiment, continue as Figure 1 It is a structural diagram schematically showing the telephoto endoscope lens according to the first embodiment of the present invention; the lens imaging combination 130 includes a fourth lens 132; on the image plane side of the fourth lens 132, the lens imaging combination 130 also includes a second cemented lens; the second cemented lens includes a fifth lens 133 and a sixth lens 134 in sequence from the object plane to the image plane, the fifth lens 133 has a positive or negative optical focal length and one of the sixth lens 134 is a positive optical focal length and the other is a negative optical focal length, or the fifth lens 133 has a positive or negative optical focal length and one of the sixth lens 134 is a negative optical focal length and the other is a positive optical focal length.

[0134] Specifically, in the endoscope objective lens 100 system, the second cemented lens includes a fifth lens 133 and a sixth lens 134, which are arranged in sequence from the object plane to the image plane. The fifth lens 133 and the sixth lens 134 can have positive or negative optical focal lengths, respectively. Through this configuration, when light passes through the second cemented lens, it passes through lenses with different optical focal lengths, thereby achieving further control and optimization of the light.

[0135] In this embodiment, by including the fifth lens 133 and the sixth lens 134 with positive or negative optical power in the second cemented lens, the endoscope objective lens 100 system can more finely adjust and correct the path and focal length of the light. This design further improves the clarity and accuracy of imaging, so that the endoscope can provide high-quality images under different operating conditions, and enhances the reliability and effectiveness of diagnosis and operation.

[0136] In one embodiment, continue as Figure 1 It is a schematic diagram showing the structure of the endoscope lens telephoto according to the first embodiment of the present invention; the first cemented lens 120 includes a second lens 121 and a third lens 122 in sequence from the object plane to the image plane, the second lens 121 has a positive or negative optical focal length, and the third lens 122 has a positive or negative optical focal length.

[0137] Specifically, in the endoscope objective lens 100 system, the first cemented lens 120 includes a second lens 121 and a third lens 122 in sequence from the object surface to the image surface. The second lens 121 and the third lens 122 can respectively have positive or negative optical powers. With this configuration, when light passes through the first cemented lens 120, it passes through a combination of lenses with different optical powers, thereby achieving precise control and optimization of light.

[0138] In this embodiment, by including the second lens 121 and the third lens 122 with positive or negative optical powers in the first cemented lens 120, the endoscope objective lens 100 system can more flexibly adjust and correct the path and focal length of light. This design can not only better correct aberrations and improve imaging quality, but also enhance the adaptability of the system, enabling the endoscope to provide high-quality images under different operating conditions, thereby improving the accuracy and reliability of diagnosis and operation.

[0139] In one embodiment, continue as Figure 1 is a schematic structural diagram showing the telephoto of the endoscope lens according to the first embodiment of the present invention; when one of the fifth lens 133 and the sixth lens 134 has a positive optical power and the other has a negative optical power, the refractive indices of the fifth lens 133 and the sixth lens 134 meet the following conditional formula:

[0140] -0.50 < Nd4 - Nd5 < 0.50;

[0141] where, Nd4 is the refractive index of the lens with negative optical power among the fifth lens 133 and the sixth lens 134; Nd5 is the refractive index of the lens with positive optical power among the fifth lens 133 and the sixth lens 134.

[0142] Specifically, in the endoscope objective lens 100 system, the refractive indices of the fifth lens 133 and the sixth lens 134 need to meet the condition of -0.50 < Nd4 - Nd5 < 0.50, where Nd4 represents the refractive index of the lens with negative optical power in the fifth lens 133 or the sixth lens 134, and Nd5 represents the refractive index of the lens with positive optical power in the fifth lens 133 or the sixth lens 134. By controlling the refractive index difference between these two lenses, light can be more precisely controlled when passing through these lenses, thereby optimizing the imaging performance.

[0143] In this embodiment, by ensuring that the refractive index difference between the fifth lens 133 and the sixth lens 134 is between -0.50 and 0.50, the endoscope objective lens 100 system can effectively correct aberrations and improve imaging quality. This design not only improves the clarity and contrast of the image, but also enhances the adaptability of the system under different operating conditions, enabling the endoscope to provide high-quality images in various environments, thereby improving the accuracy and reliability of diagnosis and operation.

[0144] In one embodiment, continuing as Figure 1 is a schematic structural diagram showing the telephoto of the endoscope lens according to the first embodiment of the present invention; when one of the fifth lens 133 and the sixth lens 134 has a positive optical power and the other has a negative optical power, the Abbe numbers of the fifth lens 133 and the sixth lens 134 satisfy the following conditional formula:

[0145] -50.0 < Vd4 - Vd5 < -15.0;

[0146] wherein, Vd4 is the Abbe number of the lens with negative optical power among the fifth lens 133 and the sixth lens 134; Vd5 is the Abbe number of the lens with positive optical power among the fifth lens 133 and the sixth lens 134.

[0147] Specifically, in the endoscope objective lens 100 system, the Abbe numbers of the fifth lens 133 and the sixth lens 134 need to satisfy the condition of -50.0 < Vd4 - Vd5 < -15.0, where Vd4 represents the Abbe number of the lens with negative optical power in the fifth lens 133 or the sixth lens 134, and Vd5 represents the Abbe number of the lens with positive optical power in the fifth lens 133 or the sixth lens 134. By controlling the difference in the Abbe numbers of these two lenses, the dispersion characteristics of light can be precisely regulated, thereby optimizing the imaging performance.

[0148] In this embodiment, by the above two conditions, the relationship between the refractive indices and Abbe numbers of the positive lens and the negative lens in the first cemented lens 120 is restricted, the optical powers and Abbe numbers of the positive and negative lenses in the cemented lens are reasonably matched, the light is better collected on the imaging surface, the brightness of the overall picture is increased, the total length of the system is reduced, and it is also beneficial to the correction of axial chromatic aberration and lateral chromatic aberration, balancing the aberrations generated by other lenses. In addition, the tolerance sensitivity of the cemented lens is relatively better than that of a single lens, which is more conducive to structural assembly, greatly improving the imaging quality of the endoscope system; further ensuring that the difference in the Abbe numbers of the fifth lens 133 and the sixth lens 134 is between -50.0 and -15.0, the endoscope objective lens 100 system can effectively correct chromatic aberration and improve the imaging quality. This design not only improves the color reproducibility and contrast of the image, but also enhances the adaptability of the system under different operating conditions, enabling the endoscope to provide high-quality images in various environments, thereby improving the accuracy and reliability of diagnosis and operation.

[0149] In one embodiment, continuing as Figure 1 is a schematic structural diagram showing the telephoto of the endoscope lens according to the first embodiment of the present invention; if the first mentioned condition is satisfied, when one of the fifth lens 133 and the sixth lens 134 has a positive optical power and the other has a negative optical power, the refractive indices of the fifth lens 133 and the sixth lens 134 satisfy the following conditional formula:

[0150] -0.50 <Nd4-Nd5<0.50;

[0151] Wherein, Nd4 is the refractive index of the lens with negative power among the fifth lens 133 and the sixth lens 134; Nd5 is the refractive index of the lens with positive power among the fifth lens 133 and the sixth lens 134;

[0152] And the second condition is satisfied when one of the fifth lens 133 and the sixth lens 134 has a positive refractive power and the other has a negative refractive power, the Abbe numbers of the fifth lens 133 and the sixth lens 134 satisfy the following conditional formula:

[0153] -50.0 <Vd4-Vd5<-15.0;

[0154] Wherein, Vd4 is the Abbe number of the lens with negative optical power among the fifth lens 133 and the sixth lens 134 ; Vd5 is the Abbe number of the lens with positive optical power among the fifth lens 133 and the sixth lens 134 .

[0155] In this embodiment, the relationship between the refractive index and the Abbe number of the fifth lens 133 and the sixth lens 134 in the second cemented lens is achieved by reasonably matching the optical focal length and the Abbe number of the positive and negative lenses in the cemented lens, so that light can be better collected to the imaging surface, the brightness of the overall image can be improved, and the total length of the system can be reduced. In addition, it is beneficial to correct axial chromatic aberration and vertical chromatic aberration, balance the aberrations caused by other lenses, and the tolerance sensitivity of the cemented lens is better than that of a single lens, which is more conducive to structural assembly, greatly improving the imaging quality of the endoscope system.

[0156] In one embodiment, continue as Figure 1 Schematically shows the structure of the endoscope lens far focus according to the first embodiment of the present invention; when one of the second lens 121 and the third lens 122 has a positive focal length and the other has a negative focal length, the refractive indexes of the second lens 121 and the third lens 122 meet the following conditional formula:

[0157] -0.50 <Nd2-Nd3<0.00;

[0158] Wherein, Nd2 is the refractive index of the lens with negative optical power among the second lens 121 and the third lens 122; Nd3 is the refractive index of the lens with negative optical power among the second lens 121 and the third lens 122.

[0159] Specifically, in the endoscopic objective lens 100 system, the refractive indices of the second lens 121 and the third lens 122 need to satisfy the condition of -0.50 < Nd2 - Nd3 < 0.00, where Nd2 represents the refractive index of the negative-power lens among the second lens 121 and the third lens 122, and Nd3 represents the refractive index of the positive-power lens among the second lens 121 and the third lens 122. By controlling the refractive index difference between these two lenses, the light can be more precisely regulated when passing through these lenses, thereby optimizing the imaging performance.

[0160] In this embodiment, by ensuring that the refractive index difference between the second lens 121 and the third lens 122 is between -0.50 and 0.00, the endoscopic objective lens 100 system can effectively correct aberrations and improve the imaging quality. This design not only improves the clarity and contrast of the image, but also enhances the adaptability of the system under different operating conditions, enabling the endoscope to provide high-quality images in various environments, thereby improving the accuracy and reliability of diagnosis and operation.

[0161] In one embodiment, continuing as Figure 1 is a schematic structural diagram showing the telephoto of the endoscopic lens according to the first embodiment of the present invention; when one of the second lens 121 and the third lens 122 has a positive optical power and the other has a negative optical power, the Abbe numbers of the second lens 121 and the third lens 122 satisfy the following conditional formula:

[0162] 5.00 < Vd2 - Vd3 < 35.00;

[0163] where Vd2 is the Abbe number of the lens with negative optical power among the second lens 121 and the third lens 122; Vd3 is the Abbe number of the lens with negative optical power among the second lens 121 and the third lens 122.

[0164] Specifically, in the endoscopic objective lens 100 system, the Abbe numbers of the second lens 121 and the third lens 122 need to satisfy the condition of 5.00 < Vd2 - Vd3 < 35.00, where Vd2 represents the Abbe number of the lens with negative optical power among the second lens 121 and the third lens 122, and Vd3 represents the Abbe number of the lens with positive optical power among the second lens 121 and the third lens 122. By controlling the Abbe number difference between these two lenses, the dispersion characteristics of the light can be precisely regulated, thereby optimizing the imaging performance.

[0165] In this embodiment, by satisfying the above two conditional expressions about the relationship between the refractive index and Abbe number of the positive lens and the negative lens in the first cemented lens 120, the optical power and Abbe number of the positive and negative lenses in the cemented lens are reasonably matched, which is conducive to the correction of axial chromatic aberration and vertical chromatic aberration, balancing the aberration generated by the first lens 110 receiving light, and the tolerance sensitivity of the cemented lens is better than that of a single lens, which is more conducive to structural assembly, ensuring that the moving group can maintain a high imaging quality during the movement; further ensuring that the difference in the Abbe number of the second lens 121 and the third lens 122 is between 5.00 and 35.00, the endoscope objective lens 100 system can effectively correct chromatic aberration and improve imaging quality. This design not only improves the color reproduction and contrast of the image, but also enhances the adaptability of the system under different operating conditions, so that the endoscope can provide high-quality images in various environments, thereby improving the accuracy and reliability of diagnosis and operation.

[0166] In one embodiment, continue as Figure 1 Schematically shows the structure of the endoscope lens telephoto according to the first embodiment of the present invention; if the first condition is satisfied, in the case where one of the second lens 121 and the third lens 122 has a positive focal length and the other has a negative focal length, the refractive indexes of the second lens 121 and the third lens 122 meet the following conditional formula:

[0167] -0.50 <Nd2-Nd3<0.00;

[0168] Wherein, Nd2 is the refractive index of the lens with negative optical power among the second lens 121 and the third lens 122; Nd3 is the refractive index of the lens with negative optical power among the second lens 121 and the third lens 122;

[0169] And the second condition is satisfied when one of the second lens 121 and the third lens 122 has a positive refractive power and the other has a negative refractive power, the Abbe numbers of the second lens 121 and the third lens 122 meet the following conditional formula:

[0170] 5.00 <Vd2-Vd3<35.00;

[0171] Wherein, Vd2 is the Abbe number of the lens with negative optical power among the second lens 121 and the third lens 122; Vd3 is the Abbe number of the lens with negative optical power among the second lens 121 and the third lens 122.

[0172] In this embodiment, the relationship between the refractive index and the Abbe number of the second lens 121 and the third lens 122 in the first cemented lens 120 is conducive to the correction of axial chromatic aberration and vertical chromatic aberration, and the balance of the aberration generated by the first lens receiving light, by reasonably matching the optical power and the Abbe number of the positive and negative lenses in the cemented lens. In addition, the tolerance sensitivity of the cemented lens is better than that of a single lens, which is more conducive to structural assembly, ensuring that the moving group can maintain a high imaging quality during the movement.

[0173] In one embodiment, continue as Figure 1 It is a structural diagram schematically showing the telephoto focus of the endoscope lens according to the first embodiment of the present invention; the lens imaging combination 130 includes a fourth lens 132; on the image plane side of the fourth lens 132, the lens imaging combination 130 also includes a second cemented lens; the second cemented lens includes a fifth lens 133 and a sixth lens 134 in sequence from the object plane to the image plane; on the image plane side of the sixth lens 134, the lens imaging combination 130 also includes an infrared filter 135 and a chip protection glass 136 in sequence from the object plane to the image plane; a laser cutoff film is attached to at least one side of the infrared filter 135.

[0174] Specifically, on the image plane side of the sixth lens 134, the lens imaging group 130 further includes an infrared filter 135 and a chip protection glass 136 in sequence, and an imaging screen 137 is also provided on the chip protection glass 136 near the image plane side. A laser cut-off film is attached to at least one side of the infrared filter 135, and this configuration can effectively filter out unnecessary infrared rays and lasers, protect the safety of the imaging sensor, and optimize the imaging performance.

[0175] In this embodiment, by adding an infrared filter 135 and a chip protection glass 136 on the image side of the sixth lens 134, and attaching a laser cut-off film on the infrared filter 135, the endoscope objective lens 100 system can effectively filter out excess infrared and laser light, and protect the imaging sensor from damage. This not only improves the clarity and contrast of the image, but also enhances the safety and durability of the system, so that the endoscope can provide high-quality images under various operating conditions, thereby improving the accuracy and reliability of diagnosis and operation.

[0176] In one embodiment, continue as Figure 1 It is a schematic structural diagram of the endoscope lens telephoto according to the first embodiment of the present invention; the lens imaging combination 130 includes a fourth lens 132, and between the object side of the fourth lens 132 and the first cemented lens 120, the lens imaging combination 130 also includes an aperture 131.

[0177] Specifically, between the fourth lens 132 and the first cemented lens 120, the lens imaging group 130 also includes a diaphragm 131. The diaphragm 131 is used to control the amount of light entering the lens system, thereby optimizing the light path and focus, and ensuring the accuracy and clarity of imaging.

[0178] In this embodiment, by adding the diaphragm 131 between the fourth lens 132 and the first cemented lens 120, the endoscope objective lens 100 system can better control the amount of light entering, reduce the influence of stray light and glare, and thus improve the clarity and contrast of imaging. This design not only improves the quality of the image, but also enhances the adaptability of the system under various operating conditions, enabling the endoscope to provide high-quality images and improving the accuracy and reliability of diagnosis and operation.

[0179] In one embodiment, continuing as Figure 1 is a schematic structural diagram showing the telephoto of the endoscope lens according to the first embodiment of the present invention; the first lens 110 has a negative optical power.

[0180] Specifically, in the endoscope objective lens 100 system, the first lens 110 has a negative optical power. This means that the first lens 110 is a concave lens that can diverge the incident light, thereby expanding the light path and cooperating with the subsequent lenses for further focusing and imaging processing.

[0181] In this embodiment, the combined lens imaging group 130 includes a fourth lens 132; the fourth lens 132 has a positive optical power, and the convex surface of the fourth lens 132 faces the image plane; the following conditional formula is satisfied between the fourth lens 132 and the endoscope objective lens 100: 0.50 < F4 / Fa < 3.50, where F4 is the focal length of the fourth lens 132; Fa is the total focal length of the endoscope objective lens 100 at telephoto. Through the negative optical power of the first lens 110, large-field incident light is received into the optical system, which is beneficial to increasing the field angle of the endoscope objective lens 100, ensuring the thinning of the front end aperture, and is beneficial to the correction of lateral chromatic aberration; in addition, the fourth lens 132 with positive optical power is placed on the right side of the diaphragm 131, which is beneficial to reducing the aberration generated by the light passing through the diaphragm 131, improving the imaging quality, and making the tolerance sensitivity of the entire system better; by using the first lens 110 with negative optical power in the system, the endoscope objective lens 100 can effectively control and expand the incident light path, providing a better optical basis for the subsequent lenses. This design not only helps to correct aberrations and improve imaging quality, but also enhances the flexibility of the system, enabling the endoscope to provide high-quality images under various operating conditions, thereby improving the accuracy and reliability of diagnosis and operation.

[0182] Combined with the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0183] Some embodiments are provided below to explain the present application clearly and completely. The parameters of each embodiment that specifically meets the above conditional formula are as follows in Table 1:

[0184] Conditional expression Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 15.00<Fm / d<35.00 17.50 21.80 24.70 29.50 28.50 23.70 24.70 0.50<F4 / Fa<3.50 2.40 1.90 2.10 2.70 2.60 1.40 2.20 1.00<Fm / F4<7.50 1.80 2.10 5.20 6.10 6.70 3.40 6.70 -0.50<Nd2-Nd3<0.00 -0.29 -0.36 -0.28 -0.39 -0.37 -0.30 -0.13 5.00<Vd2-Vd3<35.00 27.12 24.04 15.61 29.63 22.51 19.26 7.39 -30.00<Fn / F4<20.00 3.10 9.70 14.60 2.80 -23.60 -5.20 -7.70 -0.50<Nd4-Nd5<0.50 -0.01 0.05 0.19 0.19 0.25 0.07 0.22 -50.0<Vd4-Vd5<-15.0 -21.09 -22.22 -43.77 -43.77 -32.93 -29.16 -41.91

[0185] In Example 1, Figure 1 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a first embodiment of the present invention; Figure 2 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the first embodiment of the present invention; Figure 3 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the first embodiment of the present invention; Figure 4 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the first embodiment of the present invention; Figure 5 is a schematic structural diagram showing a close focus of an endoscope lens according to a first embodiment of the present invention; Figure 6 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at close focus according to the first embodiment of the present invention; Figure 7 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the first embodiment of the present invention; Figure 8 It is a schematic diagram showing the astigmatism and distortion of the endoscope lens at near focus according to the first embodiment of the present invention. The lens parameters of the endoscope objective lens in this embodiment include: surface type, radius of curvature (R value), thickness, refractive index of the material, and Abbe number, as shown in Table 2 below:

[0186] Telephoto: Total length: 6.95mm, focal length: 0.83mm, image height: 0.81mm, field of view: 135°

[0187] Close focus: total length: 6.95mm, focal length: 0.80mm, image height: 0.81mm, field of view: 135°

[0188] Surface number Surface type R-Value Thickness(mm) Refractive Index Abbe number OBJ Standard Infinity 15.0(4.00) S1 Standard Infinity 0.500 1.83 42.00 S2 Standard 0.93 0.473(0.686) S3 Standard 15.81 0.499 1.59 67.28 S4 Standard 0.85 0.787 1.88 40.16 S5 Standard 6.03 0.567(0.354) STO Standard Infinity 0.170 S7 Standard -9.52 0.858 1.58 61.34 S8 Standard -1.075 0.049 S9 Standard 3.98 0.780 1.82 46.56 S10 Standard -1.21 0.598 1.81 25.47 S11 Standard 13.86 0.661 S12 Standard Infinity 0.650 1.52 64.2 S13 Standard Infinity 0.350 1.52 64.2 IMAGE Standard Infinity /

[0189] In Example 2, Fig. 9 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a second embodiment of the present invention; Fig.10 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the second embodiment of the present invention; Fig.11 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the second embodiment of the present invention; Fig.12is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the second embodiment of the present invention; Fig.13 is a schematic structural diagram showing a close focus of an endoscope lens according to a second embodiment of the present invention; Fig.14 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at close focus according to the second embodiment of the present invention;

[0190] Fig.15 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the second embodiment of the present invention; Fig.16 It is a schematic diagram showing the astigmatism and distortion of the endoscope lens at near focus according to the second embodiment of the present invention; the lens parameters of the endoscope objective lens in this embodiment include: surface type, radius of curvature (R value), thickness, refractive index of the material, and Abbe number, as shown in Table 3 below:

[0191] Telephoto: Total length: 6.78mm, focal length: 0.83mm, image height: 0.81mm, field of view: 135°

[0192] Close focus: total length: 6.78mm, focal length: 0.80mm, image height: 0.81mm, field of view: 135°

[0193] Surface number Surface type R-Value Thickness(mm) Refractive Index Abbe number OBJ Standard Infinity 15.0(4.00) S1 Standard Infinity 0.500 1.83 42.81 S2 Standard 0.82 0.405(0.553) S3 Standard -34.55 0.651 1.52 64.20 S4 Standard 0.79 0.801 1.88 40.16 S5 Standard 5.02 0.506(0.358) STO Standard Infinity 0.133 S7 Standard 3.45 0.801 1.60 78.34 S8 Standard -1.28 0.081 S9 Standard 47.78 0.400 1.81 25.50 S10 Standard 1.22 0.731 1.76 47.72 S11 Standard -7.91 0.770 S12 Standard Infinity 0.650 1.52 64.2 S13 Standard Infinity 0.350 1.52 64.2 IMAGE Standard Infinity /

[0194] In Example 3, Fig.17 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a third embodiment of the present invention; Fig.18 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the third embodiment of the present invention; Fig.19 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the third embodiment of the present invention; Fig. 20 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the third embodiment of the present invention; Fig.21 is a schematic structural diagram showing a close focus of an endoscope lens according to a third embodiment of the present invention; Fig. 22 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at close focus according to the third embodiment of the present invention;

[0195] Fig.23 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the third embodiment of the present invention; Fig.24 It is a schematic diagram showing the astigmatism and distortion of the endoscope lens at near focus according to the third embodiment of the present invention; the lens parameters of the endoscope objective lens in this embodiment include: surface type, radius of curvature (R value), thickness, refractive index of the material, and Abbe number, as shown in Table 4 below:

[0196] Telephoto: Total length: 8.10mm, focal length: 0.82mm, image height: 0.81mm, field of view: 135°

[0197] Close focus: total length: 8.10mm, focal length: 0.79mm, image height: 0.81mm, field of view: 135°

[0198] Surface number Surface type R-Value Thickness(mm) Refractive Index Abbe number OBJ Standard Infinity 15.0(4.00) S1 Standard Infinity 0.450 1.86 35.10 S2 Standard 0.93 1.115(1.480) S3 Standard 14.80 0.800 1.84 42.73 S4 Standard -1.15 0.499 1.56 58.34 S5 Standard 2.56 0.713(0.348) STO Standard Infinity 0.121 S7 Standard 1.58 0.902 1.45 73.44 S8 Standard -1.42 0.114 S9 Standard -183.12 1.000 1.57 71.30 S10 Standard -0.76 0.400 1.76 27.55 S11 Standard -2.83 0.978 S12 Standard Infinity 0.650 1.52 64.2 S13 Standard Infinity 0.350 1.52 64.2 IMAGE Standard Infinity /

[0199] In Example 4, Fig.25 is a schematic structural diagram showing the telefocus of an endoscope lens according to a fourth embodiment of the present invention; Fig.26 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the fourth embodiment of the present invention; Fig. 27 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the fourth embodiment of the present invention; Fig.28 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the fourth embodiment of the present invention; Fig.29 is a schematic structural diagram showing a close focus of an endoscope lens according to a fourth embodiment of the present invention; Fig.30 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at near focus according to the fourth embodiment of the present invention;

[0200] Fig.31 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the fourth embodiment of the present invention; Fig.32 Schematically shows the astigmatism and distortion diagram of the endoscope lens near focus according to the fourth embodiment of the present invention; the lens parameters of the endoscope objective lens in this embodiment include: surface type, curvature radius (R value), thickness, refractive index of the material, and Abbe number, as shown in the following Table 5:

[0201] Telephoto: Total length: 8.10mm, focal length: 0.84mm, image height: 0.81mm, field of view: 135°

[0202] Close focus: total length: 8.10mm, focal length: 0.81mm, image height: 0.81mm, field of view: 135°

[0203] Surface number Surface type R-Value Thickness(mm) Refractive Index Abbe number OBJ Standard Infinity 15.0(4.00) S1 Standard Infinity 0.450 1.80 48.81 S2 Standard 0.99 0.896(1.375) S3 Standard -4.37 0.498 1.49 70.44 S4 Standard 1.46 0.801 1.88 40.81 S5 Standard 8.33 0.844(0.365) STO Standard Infinity 0.099 S7 Standard 2.14 0.901 1.55 81.61 S8 Standard -2.14 0.395 S9 Standard 2.25 1.001 1.57 71.30 S10 Standard -1.13 0.399 1.76 27.53 S11 Standard -10.24 0.810 S12 Standard Infinity 0.650 1.52 64.2 S13 Standard Infinity 0.350 1.52 64.2 IMAGE Standard Infinity /

[0204] In Example 5, Fig.33 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a fifth embodiment of the present invention; Fig.34 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the fifth embodiment of the present invention; Fig.35 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the fifth embodiment of the present invention; Fig.36is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the fifth embodiment of the present invention; Fig.37 is a schematic structural diagram showing a close focus of an endoscope lens according to a fifth embodiment of the present invention; Fig.38 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at close focus according to the fifth embodiment of the present invention;

[0205] Fig.39 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the fifth embodiment of the present invention; Fig.40 Schematically shows the astigmatism and distortion diagram of the endoscope lens near focus according to the fifth embodiment of the present invention; the lens parameters of the endoscope objective lens in this embodiment include: surface type, radius of curvature (R value), thickness, refractive index of the material, and Abbe number, as shown in Table 6 below:

[0206] Telephoto: Total length: 8.20mm, focal length: 0.81mm, image height: 0.81mm, field of view: 156°

[0207] Close focus: total length: 8.20mm, focal length: 0.78mm, image height: 0.81mm, field of view: 156°

[0208] Surface number Surface type R-Value Thickness(mm) Refractive Index Abbe number OBJ Standard Infinity 15.0(4.00) S1 Standard Infinity 0.450 1.82 45.81 S2 Standard 0.95 0.899(1.397) S3 Standard -6.82 0.502 1.51 63.36 S4 Standard 1.52 0.801 1.88 40.85 S5 Standard 7.69 1.277(0.780) STO Standard Infinity 0.147 S7 Standard 1.60 0.900 1.40 94.52 S8 Standard -1.80 0.208 S9 Standard 1.76 1.002 1.51 60.48 S10 Standard -0.99 0.400 1.76 27.55 S11 Standard 5.57 0.644 S12 Standard Infinity 0.650 1.52 1.52 S13 Standard Infinity 0.350 1.52 1.52 IMAGE Standard Infinity /

[0209] In Example 6, Fig.41 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a sixth embodiment of the present invention; Fig.42 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the sixth embodiment of the present invention; Fig.43 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the sixth embodiment of the present invention; Fig.44 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the sixth embodiment of the present invention; Fig.45 is a schematic diagram showing the structure of the close focus of an endoscope lens according to a sixth embodiment of the present invention; Fig.46 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at close focus according to the sixth embodiment of the present invention;

[0210] Fig.47 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the sixth embodiment of the present invention; Fig.48 Schematically shows the astigmatism and distortion diagram of the endoscope lens at near focus according to the sixth embodiment of the present invention; the lens parameters of the endoscope objective lens in this embodiment include: surface type, radius of curvature (R value), thickness, refractive index of the material, and Abbe number, as shown in Table 7 below:

[0211] Telephoto: Total length: 8.33mm, focal length: 0.85mm, image height: 0.81mm, field of view: 156°

[0212] Close focus: total length: 8.33mm, focal length: 0.82mm, image height: 0.81mm, field of view: 156°

[0213] Surface number Surface type R-Value Thickness(mm) Refractive Index Abbe number OBJ Standard Infinity 15.0(4.00) S1 Standard Infinity 0.450 1.88 45.10 S2 Standard 0.95 1.410(1.583) S3 Standard 4.49 0.650 1.50 66.02 S4 Standard 0.88 0.760 1.80 46.76 S5 Standard 3.15 0.799(0.626) STO Standard Infinity 0.148 S7 Standard 1.46 0.672 1.56 58.71 S8 Standard -1.23 0.156 S9 Standard -1.10 0.398 1.69 31.18 S10 Standard 1.19 0.806 1.62 60.34 S11 Standard -1.57 1.069 S12 Standard Infinity 0.650 1.52 64.2 S13 Standard Infinity 0.350 1.52 64.2 IMAGE Standard Infinity /

[0214] In Example 7, Fig.49 is a schematic structural diagram showing the telephoto focus of an endoscope lens according to a seventh embodiment of the present invention; Fig.50 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at a far focus according to the seventh embodiment of the present invention; Fig.51 is a diagram schematically showing the spherical aberration of the endoscope lens at a far focus according to the seventh embodiment of the present invention; Fig.52 is a diagram schematically showing the astigmatism and distortion of the endoscope lens at a far focus according to the seventh embodiment of the present invention; Fig.53 is a schematic diagram showing the structure of the endoscope lens close focus according to the seventh embodiment of the present invention; Fig.54 is a diagram schematically showing the magnification chromatic aberration of the endoscope lens at near focus according to the seventh embodiment of the present invention;

[0215] Fig.55 is a diagram schematically showing the spherical aberration of the endoscope lens at near focus according to the seventh embodiment of the present invention; Fig.56 Schematically shows the astigmatism and distortion diagram of the endoscope lens at near focus according to the seventh embodiment of the present invention; the lens parameters of the endoscope objective lens in this embodiment include: surface type, radius of curvature (R value), thickness, refractive index of the material, and Abbe number, as shown in Table 8 below:

[0216] Telephoto: Total length: 8.10mm, focal length: 0.80mm, image height: 0.81mm, field of view: 156°

[0217] Close focus: total length: 8.10mm, focal length: 0.77mm, image height: 0.81mm, field of view: 156°

[0218] Surface number Surface type R-Value Thickness(mm) Refractive Index Abbe number OBJ Standard Infinity 15.0(4.00) S1 Standard Infinity 0.450 1.88 40.81 S2 Standard 0.95 1.273(1.751) S3 Standard 7.78 0.782 1.69 53.38 S4 Standard -0.97 0.500 1.56 60.77 S5 Standard 3.70 0.849(0.371) STO Standard Infinity 0.149 S7 Standard 1.77 0.675 1.65 65.34 S8 Standard -2.65 0.305 S9 Standard 3.91 1.000 1.59 67.29 S10 Standard -0.85 0.560 1.81 25.38 S11 Standard -29.21 0.550 S12 Standard Infinity 0.650 1.52 64.2 S13 Standard Infinity 0.350 1.52 64.2 IMAGE Standard Infinity /

[0219] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0220] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

[0221] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0222] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0223] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0224] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0225] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0226] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0227] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An endoscope objective lens (100), characterized in that: The endoscope objective lens (100) comprises, from the object plane to the image plane, a first lens (110) and a first cemented lens (120); the first cemented lens (120) is movable along the optical axis of the endoscope objective lens (100), so that the endoscope objective lens (100) satisfies the following conditional formula: 15.00 <Fm / D<35.00 Wherein, Fm is the focal length of the first cemented lens (120); and D is the value of the first cemented lens (120) that can be moved along the optical axis of the endoscope objective lens (100).

2. The endoscope objective lens (100) according to claim 1, characterized in that: The endoscope objective lens (100) further comprises a lens imaging assembly (130) on the side of the first cemented lens (120) close to the image plane.

3. The endoscope objective lens (100) according to claim 1, characterized in that: The lens imaging assembly (130) comprises a fourth lens (132); the fourth lens (132) has a positive optical focal length, and the convex surface of the fourth lens (132) faces the image plane; the fourth lens (132) and the endoscope objective lens (100) satisfy the following conditional formula: 0.50 <F4 / Fa<3.50 Wherein, F4 is the focal length of the fourth lens (132); and Fa is the total focal length of the endoscope objective lens (100) at a far focus.

4. The endoscope objective lens (100) according to claim 1, characterized in that: The lens imaging assembly (130) comprises a fourth lens (132); the fourth lens (132) has positive optical power, and the convex surface of the fourth lens (132) faces the image plane; The first cemented lens (120) has positive optical power; the first cemented lens (120) and the fourth lens (132) satisfy the following conditional expression: 1.00 <Fm / F4<7.50。 5. The endoscope objective lens (100) according to claim 1, characterized in that: The lens imaging assembly (130) comprises a fourth lens (132); on the image plane side of the fourth lens (132), the lens imaging assembly (130) further comprises a second cemented lens; the second cemented lens has positive focal power; the second cemented lens and the fourth lens (132) satisfy the following conditional formula: -30.00 <Fn / F4<20.00 The Fn is the focal length of the second cemented lens.

6. The endoscope objective lens (100) according to claim 1, characterized in that: The lens imaging combination (130) comprises a fourth lens (132); on the image plane side of the fourth lens (132), the lens imaging combination (130) further comprises a second cemented lens; the second cemented lens comprises a fifth lens (133) and a sixth lens (134) in sequence from the object plane to the image plane, the fifth lens (133) having a positive or negative optical focal length and one of the sixth lens (134) having a positive optical focal length and the other having a negative optical focal length, or the fifth lens (133) having a positive or negative optical focal length and one of the sixth lens (134) having a negative optical focal length and the other having a positive optical focal length.

7. The endoscope objective lens (100) according to any one of claims 1 to 6, characterized in that: The first cemented lens (120) comprises a second lens (121) and a third lens (122) in sequence from the object plane to the image plane, the second lens (121) having positive or negative optical power, and the third lens (122) having positive or negative optical power.

8. The endoscope objective lens (100) according to claim 6, characterized in that: When one of the fifth lens (133) and the sixth lens (134) has a positive optical power and the other has a negative optical power, the refractive indices of the fifth lens (133) and the sixth lens (134) satisfy the following conditional formula: -0.50 <Nd4-Nd5<0.50; Wherein, Nd4 is the refractive index of the lens with negative optical power among the fifth lens (133) and the sixth lens (134); and Nd5 is the refractive index of the lens with positive optical power among the fifth lens (133) and the sixth lens (134).

9. The endoscope objective lens (100) according to claim 6, characterized in that: When one of the fifth lens (133) and the sixth lens (134) has a positive optical power and the other has a negative optical power, the Abbe numbers of the fifth lens (133) and the sixth lens (134) satisfy the following conditional expression: -50.0 <Vd4-Vd5<-15.0; Wherein, Vd4 is the Abbe number of the lens with negative optical power among the fifth lens (133) and the sixth lens (134); and Vd5 is the Abbe number of the lens with positive optical power among the fifth lens (133) and the sixth lens (134).

10. The endoscope objective (100) according to claim 7, characterized in that: When one of the second lens (121) and the third lens (122) has a positive optical power and the other has a negative optical power, the refractive indices of the second lens (121) and the third lens (122) satisfy the following conditional formula: -0.50 <Nd2-Nd3<0.00; Wherein, Nd2 is the refractive index of the lens with negative optical power among the second lens (121) and the third lens (122); and Nd3 is the refractive index of the lens with negative optical power among the second lens (121) and the third lens (122).

11. The endoscope objective lens (100) according to claim 7, characterized in that: When one of the second lens (121) and the third lens (122) has a positive optical power and the other has a negative optical power, the Abbe numbers of the second lens (121) and the third lens (122) satisfy the following conditional expression: 5.00 <Vd2-Vd3<35.00; Wherein, Vd2 is the Abbe number of the lens with negative optical focal length among the second lens (121) and the third lens (122); and Vd3 is the Abbe number of the lens with negative optical focal length among the second lens (121) and the third lens (122).

12. The endoscope objective (100) according to claim 1, characterized in that: The lens imaging combination (130) includes a fourth lens (132); on the image plane side of the fourth lens (132), the lens imaging combination (130) also includes a second cemented lens; the second cemented lens includes a fifth lens (133) and a sixth lens (134) in sequence from the object plane to the image plane; on the image plane side of the sixth lens (134), the lens imaging combination (130) also includes an infrared filter (135) and a chip protection glass (136) in sequence from the object plane to the image plane; at least one side of the infrared filter (135) is attached with a laser cutoff film.

13. The endoscope objective (100) according to claim 2, characterized in that: The lens imaging combination (130) includes a fourth lens (132), and between the object side of the fourth lens (132) and the first cemented lens (120), the lens imaging combination (130) also includes a stop (131).

14. The endoscope objective (100) according to claim 1, characterized in that: The first lens (110) has negative optical power.

15. An endoscope, characterized in that: include: An endoscope objective (100) as claimed in any one of claims 1 to 14.

16. An endoscope system, characterized in that: include: A light source device, an imaging device, and an endoscope as claimed in claim 15.

Images