Endoscope objective lens, endoscope, and endoscope system

Abstract

The application relates to an endoscope objective. The endoscope objective comprises a first lens and a first cemented lens in sequence from an object plane to an image plane. The first cemented lens moves on the optical axis of the endoscope objective, so that the difference between the focal length of the first cemented lens in the endoscope objective and the value of the movement of the first cemented lens on the optical axis of the endoscope objective is between 15.00 and 35.00, which can make the appropriate proportion of the focal length of the first cemented lens and the distance of the first cemented lens in the far-focal switching, be beneficial to the correction of aberration and the tolerance sensitivity of the dynamic group, and the total length is short, which is beneficial to reducing the length of the whole endoscope hard part, can improve the observation depth of the endoscope, ensure the good image of the close-range observation, and effectively improve the observation and information acquisition accuracy of the endoscope.

Description

Technical Field

[0001] This application relates to the field of endoscopy technology, and in particular to an endoscopy objective, an endoscope, and an endoscopy system. Background Technology

[0002] With the widespread use of endoscopic technology in the medical field, images of various parts within body cavities are typically obtained through the insertion of an endoscope, enabling the observation and diagnosis of lesions. Traditional techniques, for precise diagnosis of abnormal areas, require endoscopes with excellent image quality, high pixel count, clear image quality, and good depth of field to better acquire abnormal information. A wide field of view is also desirable to increase the observation range and shorten examination time. Therefore, endoscopic observation aims to obtain a focused image over a wide range from near to far points. Some traditional techniques improve this by adjusting the aperture value (F-number), while others use zoom (focusing), thereby enhancing the image quality at both near and far focal points. However, traditional endoscopic techniques still suffer from drawbacks such as an unbalanced wide field of view, chromatic aberration correction, and system tolerance sensitivity, resulting in lower accuracy in observation and information acquisition. Summary of the Invention

[0003] Therefore, it is necessary to overcome the shortcomings of the existing technology and provide an endoscope objective lens that has a wide field of view, good chromatic aberration correction, good tolerance sensitivity, and meets the needs of close-range observation. It can effectively improve the accuracy of endoscope observation and information acquisition, and reducing the length of the CHA can effectively reduce the length of the rigid part of the endoscope.

[0004] The technical solution is as follows: An endoscope objective, comprising, 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, such that the endoscope objective satisfies the following condition:

[0005] 15.00 <Fm / D<35.00

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

[0007] The aforementioned endoscope objective, from the object plane to the image plane, sequentially includes: a first lens and a first cemented lens; the first cemented lens moves along the optical axis of the endoscope objective, such that the difference between the focal length of the first cemented lens in the endoscope objective and the value of the movement of the first cemented lens along the optical axis of the endoscope objective is between 15.00 and 35.00, which allows for an appropriate ratio between the focal length of the first cemented lens and the distance of the first cemented lens when switching between near and far focus, which is beneficial for aberration correction and tolerance sensitivity of motion group groups. Furthermore, the overall length is relatively short, which helps to reduce the length of the entire rigid part of the endoscope, while also increasing the observation depth of the endoscope, ensuring good images for close-up observation, and effectively improving the accuracy of endoscope observation and information acquisition.

[0008] In one embodiment, the endoscope objective further includes a lens imaging assembly on the side of the first cemented lens near the image plane.

[0009] In one embodiment, the lens imaging assembly includes a fourth lens; the fourth lens has positive optical power, and the convex surface of the fourth lens faces the image plane; the fourth lens and the endoscope objective satisfy the following condition:

[0010] 0.50 <F4 / Fa<3.50

[0011] Wherein, F4 is the focal length of the fourth lens; and Fa is the total focal length of the endoscope objective at the telephoto position.

[0012] In one embodiment, the lens imaging assembly 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 optical power; the first cemented lens and the fourth lens satisfy the following condition:

[0014] 1.00 <Fm / F4<7.50。

[0015] In one embodiment, the lens imaging assembly includes a fourth lens; on the image plane side of the fourth lens, the lens imaging assembly further includes a second cemented lens; the second cemented lens has positive optical power; the second cemented lens and the fourth lens satisfy the following condition:

[0016] -30.00 <Fn / F4<20.00

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

[0018] In one embodiment, the lens imaging assembly includes a fourth lens; on the image plane side of the fourth lens, the lens imaging assembly further includes a second cemented lens; the second cemented lens includes a fifth lens and a sixth lens sequentially from the object plane to the image plane, the fifth lens having positive or negative optical power and one of the sixth lenses having positive optical power and the other having negative optical power, or the fifth lens having positive or negative optical power and one of the sixth lenses having negative optical power and the other having positive optical power.

[0019] In one embodiment, the first cemented lens includes a second lens and a third lens sequentially from the object plane to the image plane, the second lens having positive or negative optical power, and the third lens having 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 indices of the fifth lens and the sixth lens satisfy the following condition:

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

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

[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 condition:

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

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

[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 indices of the second lens and the third lens satisfy the following condition:

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

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

[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; and 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 assembly includes a fourth lens; on the image plane side of the fourth lens, the lens imaging assembly further includes a second cemented lens; the second cemented lens includes a fifth lens and a sixth lens sequentially from the object plane to the image plane; on the image plane side of the sixth lens, the lens imaging assembly further includes an infrared filter and a chip protective glass sequentially from the object plane to the image plane; at least one side of the infrared filter is attached with a laser cutoff film.

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

[0034] In one embodiment, the first lens has a 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 aforementioned endoscope objective, the endoscope objective comprises, from the object plane to the image plane, a first lens and a first cemented lens. The first cemented lens moves along the optical axis of the endoscope objective, such that the difference between the focal length of the first cemented lens in the endoscope objective and the value of the movement of the first cemented lens along the optical axis of the endoscope objective is between 15.00 and 35.00. This ensures an appropriate ratio between the focal length of the first cemented lens and the distance of the first cemented lens when switching between near and far focus, which is beneficial for aberration correction and tolerance sensitivity of motion group groups. Furthermore, the overall length is shorter, which helps to reduce the length of the entire rigid part of the endoscope. At the same time, it can improve the observation depth of the endoscope, ensure good images for close-up observation, and effectively improve the accuracy of endoscope observation and information acquisition. Attached Figure Description

[0038] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a first embodiment of the present invention;

[0041] Figure 2 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at the telephoto focal length according to the first embodiment of the present invention;

[0042] Figure 3 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the first embodiment of the present invention;

[0043] Figure 4 This is a schematic diagram showing the astigmatism and distortion of the telephoto lens of an endoscope according to the first embodiment of the present invention;

[0044] Figure 5 This is a schematic diagram illustrating the structure of an endoscope lens in near focus according to a first embodiment of the present invention;

[0045] Figure 6 This is a schematic representation of the magnification chromatic aberration diagram of an endoscope lens at near focus according to a first embodiment of the present invention;

[0046] Figure 7 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to a first embodiment of the present invention;

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

[0048] Figure 9 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a second embodiment of the present invention;

[0049] Figure 10 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at the telephoto focal length according to the second embodiment of the present invention;

[0050] Figure 11 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the second embodiment of the present invention;

[0051] Figure 12 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at the telephoto focal length according to a second embodiment of the present invention;

[0052] Figure 13 This is a schematic diagram illustrating the structure of an endoscope lens in near focus according to a second embodiment of the present invention;

[0053] Figure 14 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the second embodiment of the present invention;

[0054] Figure 15 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to a second embodiment of the present invention;

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

[0056] Figure 17 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a third embodiment of the present invention;

[0057] Figure 18 This is a schematic representation of the chromatic aberration diagram at the telephoto focal length of an endoscope lens according to a third embodiment of the present invention;

[0058] Figure 19 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the third embodiment of the present invention;

[0059] Figure 20 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at the telephoto focal length according to a third embodiment of the present invention;

[0060] Figure 21 This is a schematic diagram illustrating the structure of an endoscope lens in near focus according to a third embodiment of the present invention;

[0061] Figure 22 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the third embodiment of the present invention;

[0062] Figure 23 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to a third embodiment of the present invention;

[0063] Figure 24 This is a schematic diagram showing the astigmatism and distortion of an endoscope lens at near focus according to a third embodiment of the present invention;

[0064] Figure 25 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a fourth embodiment of the present invention;

[0065] Figure 26 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at the telephoto focal length according to the fourth embodiment of the present invention;

[0066] Figure 27 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the fourth embodiment of the present invention;

[0067] Figure 28 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at the telephoto focal length according to the fourth embodiment of the present invention;

[0068] Figure 29 This is a schematic diagram illustrating the structure of an endoscope lens in near focus according to a fourth embodiment of the present invention;

[0069] Figure 30 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the fourth embodiment of the present invention;

[0070] Figure 31 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to the fourth embodiment of the present invention;

[0071] Figure 32 This is a schematic diagram showing the astigmatism and distortion of an endoscope lens at near focus according to the fourth embodiment of the present invention;

[0072] Figure 33 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a fifth embodiment of the present invention;

[0073] Figure 34 This is a schematic representation of the chromatic aberration diagram at the telephoto focal length of an endoscope lens according to the fifth embodiment of the present invention;

[0074] Figure 35 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the fifth embodiment of the present invention;

[0075] Figure 36 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at the telephoto focal length according to the fifth embodiment of the present invention;

[0076] Figure 37 This is a schematic diagram illustrating the structure of an endoscope lens in near focus according to a fifth embodiment of the present invention;

[0077] Figure 38 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the fifth embodiment of the present invention;

[0078] Figure 39 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to the fifth embodiment of the present invention;

[0079] Figure 40 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at near focus according to the fifth embodiment of the present invention;

[0080] Figure 41 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a sixth embodiment of the present invention;

[0081] Figure 42 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at the telephoto focal length according to the sixth embodiment of the present invention;

[0082] Figure 43 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the sixth embodiment of the present invention;

[0083] Figure 44 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at its telephoto focal length according to the sixth embodiment of the present invention;

[0084] Figure 45 This is a schematic diagram illustrating the structure of an endoscope lens in near-focus according to a sixth embodiment of the present invention;

[0085] Figure 46 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the sixth embodiment of the present invention;

[0086] Figure 47 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to the sixth embodiment of the present invention;

[0087] Figure 48 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at near focus according to the sixth embodiment of the present invention;

[0088] Figure 49 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to the seventh embodiment of the present invention;

[0089] Figure 50 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at the telephoto focal length according to the seventh embodiment of the present invention;

[0090] Figure 51 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the seventh embodiment of the present invention;

[0091] Figure 52 This is a schematic diagram showing the astigmatism and distortion of the telephoto lens of the endoscope according to the seventh embodiment of the present invention;

[0092] Figure 53 This is a schematic diagram illustrating the structure of an endoscope lens in near-focus according to a seventh embodiment of the present invention;

[0093] Figure 54 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the seventh embodiment of the present invention;

[0094] Figure 55 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to the seventh embodiment of the present invention;

[0095] Figure 56 This is a schematic diagram showing the astigmatism and distortion of an endoscope lens at near focus according to the seventh embodiment of the present invention.

[0096] Among them, the endoscope objective lens 100, the first lens 110, the first cemented lens 120, the lens imaging assembly 130, the second lens 121, the third lens 122, the aperture 131, the fourth lens 132, the fifth lens 133, the sixth lens 134, the infrared filter 135, the chip protective glass 136, and the imaging screen 137. Detailed Implementation

[0097] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0098] In traditional techniques, for precise diagnosis of abnormal areas, endoscopes are expected to possess excellent imaging quality, high pixel count, clear image quality, and good image quality across the depth of field to better acquire abnormal information. A wide field of view is also desired to increase the observation range and shorten examination time. Therefore, when using endoscopes for observation, it is desirable to obtain a focused image over a wide range from near to far points. Some traditional techniques improve the imaging quality of the endoscope at near and far focal points by adjusting the aperture value (F-number), while others use zoom focusing. However, traditional endoscope techniques still suffer from shortcomings such as an unbalanced wide field of view, chromatic aberration correction, and system tolerance sensitivity, resulting in lower accuracy in endoscopic observation and information acquisition. The endoscope objective 100 of this application 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 100, such that the difference between the focal length of the first cemented lens 120 in the endoscope objective 100 and the value of the first cemented lens 120's movable value along the optical axis is between 15.00 and 35.00. This allows for an appropriate ratio between the focal length of the first cemented lens 120 and the distance of the first cemented lens 120 when switching between near and far focus, which is beneficial for aberration correction and tolerance sensitivity of motion group groups. Furthermore, the overall length is shorter, which helps to reduce the length of the entire rigid part of the endoscope. At the same time, it can improve the observation depth of the endoscope, ensure good images for close-up observation, and effectively improve the accuracy of endoscope observation and information acquisition.

[0099] In one embodiment, Figure 1 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a first embodiment of the present invention; from Figure 1 It can be seen that the endoscope objective 100, from the object plane to the image plane, includes: 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 100, such that the endoscope objective 100 satisfies the following condition:

[0100] 15.00 <Fm / D<35.00

[0101] Where Fm is the focal length of the first cemented lens 120; D is the value of the first cemented lens 120's movable distance along the optical axis in the endoscope objective 100. Under normal circumstances, the value of the first cemented lens 120's movable distance along the optical axis in the endoscope objective 100 is the distance for switching between telephoto and near focus.

[0102] Specifically, in the endoscope objective lens 100 system, after light enters from the object surface, it first passes through the first lens 110 and then through the first cemented lens 120. The focal length can be adjusted by moving the first cemented lens 120 along the optical axis. When the movement of the first cemented lens 120 along the optical axis changes, the focal length is adjusted accordingly, keeping the difference between 15.00 and 35.00. If the lower limit is exceeded, the movement of the motion group will increase, resulting in a larger overall length of the endoscope system, which is not conducive to reducing the length of the rigid section, affecting clinical use, and deteriorating the image quality at near points. If the upper limit is exceeded, the focal length of the cemented lens decreases, producing a larger optical power, resulting in poorer tolerance sensitivity to the motion group, poorer image quality during near-far focus switching, and difficulty in correcting chromatic aberration, making it impossible to obtain high-resolution images. This design ensures that the endoscope can obtain clear and stable images under different operating conditions, thus achieving precise imaging adjustment and optimization.

[0103] Therefore, in the aforementioned endoscope objective 100, the endoscope objective 100 sequentially 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 100, such that the difference between the focal length of the first cemented lens 120 in the endoscope objective 100 and the value of the first cemented lens 120's movable value along the optical axis is between 15.00 and 35.00. This ensures an appropriate ratio between the focal length of the first cemented lens 120 and the distance of the first cemented lens 120 when switching between near and far focus, which is beneficial for aberration correction and tolerance sensitivity of motion group groups. Furthermore, the shorter overall length helps reduce the length of the entire rigid part of the endoscope, while also increasing the observation depth of the endoscope, ensuring good images for close-up observation, and effectively improving the accuracy of endoscope observation and information acquisition.

[0104] In one embodiment, continue as follows Figure 1 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a first embodiment of the present invention; on the side of the first cemented lens 120 near the image plane, the endoscope objective lens 100 also includes a lens imaging group 130.

[0105] Specifically, in the endoscope objective 100, after light enters from the object surface, it first passes 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 closer to the image plane. This design adjusts the focal length by moving the first cemented lens 120 along the optical axis, while the lens imaging group 130 further optimizes the image quality, ensuring more precise light transmission and focusing during the imaging process, thereby achieving high-quality image output.

[0106] In this embodiment, by adding the lens imaging assembly on the side of the first cemented lens 120 adjacent to the image plane, the endoscope objective lens 100 can better correct aberrations and improve imaging quality, while maintaining the accuracy of focal length adjustment during the movement along 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 state of the endoscope lens according to the first embodiment of the present invention; the lens imaging assembly includes 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 following conditional expression 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 the telephoto state.

[0110] Specifically, in the endoscope objective lens 100 system, after light enters from the object plane, it first passes through the first lens 110, then passes through the first cemented lens 120, and the lens imaging assembly is added on the side of the first cemented lens 120 adjacent to the image plane. The lens imaging assembly includes a fourth lens 132 with 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 the telephoto state. This design realizes optimization and control of the imaging process by adjusting the positions and characteristics of the optical elements.

[0111] In this embodiment, by adding the fourth lens 132 which has positive optical power and has its convex surface facing the image plane in the lens imaging assembly, and making the ratio of its focal length to the total focal length of the endoscope objective lens 100 satisfy the range 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, so that the endoscope can 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 1is a schematic structural diagram illustrating the telephoto state of the endoscope lens according to the first embodiment of the present invention; in the case that the first lens 110 has negative optical power, the lens imaging group 130 includes 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 following conditional expression is satisfied between the fourth lens 132 and the endoscope objective lens 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 lens 100 in the telephoto state.

[0115] Specifically, the first lens 110 is designed to have negative optical power to achieve a specific optical adjustment effect. Next, the lens imaging group 130 is added into the endoscope objective lens 100, which includes a fourth lens 132 with positive optical power. To ensure imaging quality, the convex surface of the fourth lens 132 should face the image plane, and the optical conditional expression 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 lens 100 in the telephoto state shall be within this range. This design process ensures that the endoscope objective lens has excellent imaging performance and focal length control capability in the telephoto state.

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

[0117] In one embodiment, continuing as Figure 1 is a schematic structural diagram illustrating the telephoto state of the endoscope lens according to the first embodiment of the present invention; the first cemented lens 120 has positive optical power; the following conditional expression 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 positive optical power, and a relationship of 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 along the optical axis, the adjustment of the focal length can be coordinated with the optical properties of the fourth lens 132, so as to achieve the optimal imaging effect.

[0120] In this embodiment, by making the ratio of the focal length of the first cemented lens 120 to the focal length of the fourth lens 132 fall within an appropriate range as specified in the conditional expression, it is beneficial to the aberration correction of the diaphragm 131 and the tolerance sensitivity of the movable lens group; if the lower limit is exceeded, the aberration correction of the diaphragm 131 will be insufficient, and the optimization difficulty for the lenses behind the diaphragm 131 will increase; if the upper limit is exceeded, the aberration correction of the diaphragm 131 will be excessive, and the tolerance sensitivity of the movable lens group will be poor, resulting in poor image quality during the switching between far focus and near focus, and high-resolution images cannot be obtained; 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, so that the endoscope objective lens 100 system can better correct aberrations and optimize imaging quality. This design improves the clarity and stability of the image, enabling the endoscope to provide high-quality images under various operating conditions, and enhancing the accuracy and reliability of diagnosis and operation.

[0121] In one embodiment, continuing as Figure 1 is a schematic structural diagram showing the far focus state of the endoscope lens according to the first embodiment of the present invention; under the condition that the first cemented lens 120 has positive optical power, the second lens 121 has positive or negative optical power, and the third lens 122 has positive or negative optical power, the following conditional expression 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 to the focal length of the fourth lens 132 is beneficial to the aberration correction of the diaphragm and the tolerance sensitivity of the movable lens group; if the lower limit is exceeded, the aberration correction of the diaphragm will be insufficient, and the optimization difficulty for the lenses behind the diaphragm will increase; if the upper limit is exceeded, the aberration correction of the diaphragm will be excessive, and the tolerance sensitivity of the movable lens group will be poor, resulting in poor image quality during the switching between far focus and near focus, and high-resolution images cannot be obtained.

[0124] In one embodiment, continuing as Figure 1is a schematic structural diagram illustrating the telephoto state of the endoscope lens according to the first embodiment of the present invention; the lens imaging assembly 130 includes a fourth lens 132; on the image plane side of the fourth lens 132, the lens imaging assembly 130 further includes a second cemented lens; the second cemented lens has positive optical power; the following conditional expression 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 positive optical power is added on the image plane side of the fourth lens 132. The relationship of -30.00<Fn / F4<20.00 is satisfied between the focal length Fn of the second cemented lens and the focal length F4 of the fourth lens 132. This design ensures that the imaging process after the fourth lens 132 can further optimize the focusing and transmission of light rays, so as to achieve high-quality imaging effects.

[0128] In this embodiment, by satisfying that the ratio of the focal length of the second cemented lens to the focal length of the fourth lens 132 in the conditional expression falls within an appropriate range, it is beneficial to the correction of aberration, chromatic aberration and field curvature of the diaphragm 131 and the reduction of the total length of the endoscope system; if the value goes beyond the lower limit, the aberration of the diaphragm 131 will be insufficiently corrected, and the field curvature of the optical system cannot be well corrected at the same time; if the value goes beyond the upper limit, the aberration of the diaphragm 131 will be overcorrected, which 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 the total length of the optical system becomes longer, which is not conducive to the use of clinical products; further adding the second cemented lens on the image plane side of the fourth lens 132 and ensuring that the ratio between its focal length and the focal length of the fourth lens 132 satisfies the range from -30.00 to 20.00 enables the endoscope objective lens 100 system to 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, continuing as Figure 1 is a schematic structural diagram illustrating the telephoto state of the endoscope lens according to the first embodiment of the present invention; in the case that the fifth lens 133 has positive or negative optical power and the sixth lens 134 has positive or negative optical power, the second cemented lens has positive optical power; the following conditional expression 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, the appropriate ratio of the focal length of the second cemented lens and the focal length of the fourth lens 132 is beneficial for the correction of aperture aberration, chromatic aberration, and field curvature, as well as for reducing the overall length of the endoscope system. If the ratio exceeds the lower limit, the aperture aberration correction will be insufficient, and the field curvature of the optical system will also not be well corrected. If the ratio exceeds the upper limit, the aperture aberration correction will be excessive, and it will not be beneficial for the correction of chromatic aberration. In addition, the aberrations generated in front of the aperture cannot be well balanced, and the overall length of the optical system will increase, which is not conducive to the use of clinical products.

[0133] In one embodiment, continue as follows Figure 1 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a first embodiment of the present invention; the lens imaging assembly 130 includes a fourth lens 132; on the image plane side of the fourth lens 132, the lens imaging assembly 130 also includes a second cemented lens; the second cemented lens includes a fifth lens 133 and a sixth lens 134 sequentially from the object plane to the image plane, wherein the fifth lens 133 has a positive or negative optical power and one of the sixth lens 134 has a positive optical power and the other has a negative optical power, or the fifth lens 133 has a positive or negative optical power and one of the sixth lens 134 has a negative optical power and the other has a positive optical power.

[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 sequentially from the object plane to the image plane. The fifth lens 133 and the sixth lens 134 can each have positive or negative optical power. With this configuration, light passes through lenses of different optical powers when passing through the second cemented lens, thereby achieving further control and optimization of the light.

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

[0136] In one embodiment, continue as follows Figure 1 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a first embodiment of the present invention; the first cemented lens 120 includes a second lens 121 and a third lens 122 sequentially 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.

[0137] Specifically, in the endoscope objective lens 100 system, the first cemented lens 120 sequentially includes a second lens 121 and a third lens 122 from the object side to the image side. The second lens 121 and the third lens 122 may each have positive or negative optical power. With this configuration, when light passes through the first cemented lens 120, it passes through a lens combination with different optical powers, thereby realizing precise regulation and optimization of the light.

[0138] In this embodiment, by including the second lens 121 and the third lens 122 with positive or negative optical power 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, so that the endoscope can provide high-quality images under different operating conditions, thereby improving the accuracy and reliability of diagnosis and operation.

[0139] In one embodiment, continuing as Figure 1 is a schematic structural diagram showing the telephoto end of the endoscope lens according to the first embodiment of the present invention; in the case where one of the fifth lens 133 and the sixth lens 134 has positive optical power and the other has negative optical power, the refractive indices of the fifth lens 133 and the sixth lens 134 satisfy the following conditional expression:

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

[0141] wherein 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 satisfy the condition of -0.50<Nd4-Nd5<0.50, wherein 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 difference in refractive index between these two lenses, the light can be more precisely regulated 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, so that the endoscope can 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 illustrating the telephoto end of the endoscope lens according to the first embodiment of the present invention; in the case that one of the fifth lens 133 and the sixth lens 134 has positive optical power and the other has negative optical power, the Abbe numbers of the fifth lens 133 and the sixth lens 134 satisfy the following conditional expression:

[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, wherein 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 Abbe numbers of these two lenses, the dispersion characteristics of light can be precisely adjusted, thereby optimizing the imaging performance.

[0148] In this embodiment, the above two conditions constrain the relationship between the refractive index and the Abbe number of the positive lens and the negative lens in the first cemented lens 120, and the optical power and Abbe number of the positive and negative lenses in the cemented lens are reasonably matched, so that light can be better collected to the imaging plane, the brightness of the overall picture is improved, the total length of the system is reduced, it is also beneficial to the correction of axial chromatic aberration and lateral chromatic aberration, and the aberrations generated by other lenses are balanced. In addition, the tolerance sensitivity of the cemented lens is better than that of a single lens, which is more conducive to structural assembly, and greatly improves the imaging quality of the endoscope system; further ensuring that the difference in Abbe numbers between 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 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.

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

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

[0151] Wherein, 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.

[0152] Furthermore, the second 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 Abbe numbers of the fifth lens 133 and the sixth lens 134 then satisfy the following condition:

[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 Abbe number of the fifth lens 133 and the sixth lens 134 in the second cemented lens, by reasonably matching the optical power and Abbe number of the positive and negative lenses in the cemented lens, better collects light onto the imaging surface, improves the overall brightness of the image, reduces the total length of the system, and is also beneficial for the correction of axial and transverse chromatic aberration, balancing the aberrations generated by other lenses. Furthermore, the tolerance sensitivity of the cemented lens is relatively better than that of a single lens, which is more conducive to structural assembly and greatly improves the imaging quality of the endoscope system.

[0156] In one embodiment, continue as follows Figure 1 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a 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 refractive indices of the second lens 121 and the third lens 122 satisfy the following conditional expression:

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

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

[0159] Specifically, in the endoscope 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 lens with negative optical power among the second lens 121 and the third lens 122, and Nd3 represents the refractive index of the lens with positive optical power among the second lens 121 and the third lens 122. By controlling the refractive index difference between these two lenses, the light rays can be regulated more precisely 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 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, so that the endoscope can 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 illustrating the telephoto end of the endoscope lens according to the first embodiment of the present invention; in the case where one of the second lens 121 and the third lens 122 has positive optical power and the other has negative optical power, the Abbe numbers of the second lens 121 and the third lens 122 satisfy the following conditional expression:

[0162] 5.00<Vd2-Vd3<35.00;

[0163] 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.

[0164] Specifically, in the endoscope 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 or the third lens 122, and Vd3 represents the Abbe number of the lens with positive optical power among the second lens 121 or the third lens 122. By controlling the Abbe number difference between these two lenses, the dispersion characteristics of light rays can be precisely regulated, thereby optimizing the imaging performance.

[0165] In this embodiment, by satisfying the above two conditional expressions regarding the relationship between the refractive index and Abbe number of the positive and negative lenses 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. This is beneficial for correcting axial and transverse chromatic aberration, balancing the aberrations generated by the light received by the first lens 110, and the tolerance sensitivity of the cemented lens is better than that of a single lens, which is more conducive to structural assembly and ensures that the moving group can maintain high imaging quality during movement. Furthermore, by ensuring that the Abbe number difference between 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, enabling the endoscope to provide high-quality images in various environments, thereby improving the accuracy and reliability of diagnosis and operation.

[0166] In one embodiment, continue as follows Figure 1 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a first embodiment of the present invention; if the first condition is met, and 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 expression:

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

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

[0169] Furthermore, if the second condition is met, and one of the second lens 121 and the third lens 122 has a positive optical power and the other has a negative optical power, then the Abbe numbers of the second lens 121 and the third lens 122 satisfy the following condition:

[0170] 5.00 <Vd2-Vd3<35.00;

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

[0172] In this embodiment, the relationship between the refractive index and Abbe number of the second lens 121 and the third lens 122 in the first cemented lens 120, by reasonably matching the optical power and Abbe number of the positive and negative lenses in the cemented lens, is beneficial to the correction of axial chromatic aberration and transverse chromatic aberration, balances the aberrations generated by the first lens 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 and ensures that the moving group can maintain a high imaging quality during the movement process.

[0173] In one embodiment, continue as follows Figure 1 This is a schematic diagram illustrating the structure of a telephoto lens of an endoscope according to a first embodiment of the present invention; the lens imaging assembly 130 includes a fourth lens 132; on the image plane side of the fourth lens 132, the lens imaging assembly 130 also includes a second cemented lens; the second cemented lens includes a fifth lens 133 and a sixth lens 134 sequentially from the object plane to the image plane; on the image plane side of the sixth lens 134, the lens imaging assembly 130 also includes an infrared filter 135 and a chip protective glass 136 sequentially from the object plane to the image plane; at least one side of the infrared filter 135 is attached with a laser cutoff film.

[0174] Specifically, on the image plane side of the sixth lens 134, the lens imaging assembly 130 also includes an infrared filter 135 and a chip protective glass 136 in sequence, and an imaging screen 137 is also located on the chip protective glass 136 near the image plane side. The infrared filter 135 has a laser cutoff film attached to at least one side. This configuration can effectively filter out unwanted infrared rays and lasers, protect the imaging sensor, and optimize imaging performance.

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

[0176] In one embodiment, continue as follows Figure 1 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a first embodiment of the present invention; the lens imaging assembly 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 assembly 130 also includes an aperture stop 131.

[0177] Specifically, between the fourth lens 132 and the first cemented lens 120, the lens imaging group 130 further includes a diaphragm 131. The diaphragm 131 is used to control the amount of light entering the lens system, so as to optimize the light path and focal point, and ensure 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 incoming light, reduce the influence of stray light and glare, thereby improving the clarity and contrast of imaging. This design not only improves the image quality, 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 operations.

[0179] In one embodiment, continuing as shown in Figure 1 is a schematic structural diagram showing the telephoto end 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, which can diverge the incoming light, thereby expanding the light path, and cooperating with subsequent lenses for further focusing and imaging processing.

[0181] In this embodiment, 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 fourth lens 132 and the endoscope objective lens 100 satisfy the following conditional expression: 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 the telephoto end. Through the negative optical power of the first lens 110, the incident light with a large field of view is received into the optical system, which is beneficial to increasing the field angle of the endoscope objective lens 100, ensuring the miniaturization of the front aperture, and facilitating the correction of lateral chromatic aberration; in addition, the fourth lens 132 with positive optical power is disposed on the right side of the diaphragm 131, which is beneficial to reducing the aberration generated by light passing through the diaphragm 131, improving the imaging quality, and making the entire system have good tolerance sensitivity; by using the first lens 110 with negative optical power in the system, the endoscope objective lens 100 can effectively control and expand the path of the incoming light, providing a better optical basis for subsequent lenses. This design not only helps to correct aberrations and improve imaging quality, but also enhances the flexibility 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 operations.

[0182] The technical solutions in the embodiments of this application will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0183] The following provides some embodiments to explain and clearly and completely describe this application. The parameters of each embodiment that specifically meets the above conditions are shown in Table 1 below:

[0184] 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 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a first embodiment of the present invention; Figure 2 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at the telephoto focal length according to the first embodiment of the present invention; Figure 3 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the first embodiment of the present invention; Figure 4 This is a schematic diagram showing the astigmatism and distortion of the telephoto lens of an endoscope according to the first embodiment of the present invention; Figure 5 This is a schematic diagram illustrating the structure of an endoscope lens in near focus according to a first embodiment of the present invention; Figure 6 This is a schematic representation of the magnification chromatic aberration diagram of an endoscope lens at near focus according to a first embodiment of the present invention; Figure 7 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to a first embodiment of the present invention; Figure 8 This diagram schematically illustrates the astigmatism and distortion of an endoscope lens at near focus according to a first embodiment of the present invention. The lens parameters of the endoscope objective 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-up: Total length: 6.95mm, Focal length: 0.80mm, Image height: 0.81mm, Field of view: 135°

[0188] 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, Figure 9 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a second embodiment of the present invention; Figure 10 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at the telephoto focal length according to the second embodiment of the present invention; Figure 11 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the second embodiment of the present invention; Figure 12This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at the telephoto focal length according to a second embodiment of the present invention; Figure 13 This is a schematic diagram illustrating the structure of an endoscope lens in near focus according to a second embodiment of the present invention; Figure 14 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the second embodiment of the present invention;

[0190] Figure 15 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to a second embodiment of the present invention; Figure 16 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at near focus according to a second embodiment of the present invention; the lens parameters of the endoscope objective 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-up: Total length: 6.78mm, Focal length: 0.80mm, Image height: 0.81mm, Field of view: 135°

[0193] 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, Figure 17 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a third embodiment of the present invention; Figure 18 This is a schematic representation of the chromatic aberration diagram at the telephoto focal length of an endoscope lens according to a third embodiment of the present invention; Figure 19 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the third embodiment of the present invention; Figure 20 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at the telephoto focal length according to a third embodiment of the present invention; Figure 21 This is a schematic diagram illustrating the structure of an endoscope lens in near focus according to a third embodiment of the present invention; Figure 22 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the third embodiment of the present invention;

[0195] Figure 23 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to a third embodiment of the present invention; Figure 24 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at near focus according to a third embodiment of the present invention; the lens parameters of the endoscope objective 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-up: Total length: 8.10mm, Focal length: 0.79mm, Image height: 0.81mm, Field of view: 135°

[0198] 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, Figure 25 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a fourth embodiment of the present invention; Figure 26 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at the telephoto focal length according to the fourth embodiment of the present invention; Figure 27 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the fourth embodiment of the present invention; Figure 28 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at the telephoto focal length according to the fourth embodiment of the present invention; Figure 29 This is a schematic diagram illustrating the structure of an endoscope lens in near focus according to a fourth embodiment of the present invention; Figure 30 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the fourth embodiment of the present invention;

[0200] Figure 31 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to the fourth embodiment of the present invention; Figure 32 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at near focus according to the fourth embodiment of the present invention; the lens parameters of the endoscope objective in this embodiment include: surface type, radius of curvature (R value), thickness, refractive index of the material, and Abbe number, as shown in Table 5 below:

[0201] Telephoto: Total length: 8.10mm, Focal length: 0.84mm, Image height: 0.81mm, Field of view: 135°

[0202] Close-up: Total length: 8.10mm, Focal length: 0.81mm, Image height: 0.81mm, Field of view: 135°

[0203] 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, Figure 33 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a fifth embodiment of the present invention; Figure 34 This is a schematic representation of the chromatic aberration diagram at the telephoto focal length of an endoscope lens according to the fifth embodiment of the present invention; Figure 35 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the fifth embodiment of the present invention; Figure 36This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at the telephoto focal length according to the fifth embodiment of the present invention; Figure 37 This is a schematic diagram illustrating the structure of an endoscope lens in near focus according to a fifth embodiment of the present invention; Figure 38 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the fifth embodiment of the present invention;

[0205] Figure 39 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to the fifth embodiment of the present invention; Figure 40 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at near focus according to the fifth embodiment of the present invention; the lens parameters of the endoscope objective 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-up: Total length: 8.20mm, Focal length: 0.78mm, Image height: 0.81mm, Field of view: 156°

[0208] 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, Figure 41 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to a sixth embodiment of the present invention; Figure 42 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at the telephoto focal length according to the sixth embodiment of the present invention; Figure 43 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the sixth embodiment of the present invention; Figure 44 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at its telephoto focal length according to the sixth embodiment of the present invention; Figure 45 This is a schematic diagram illustrating the structure of an endoscope lens in near-focus according to a sixth embodiment of the present invention; Figure 46 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the sixth embodiment of the present invention;

[0210] Figure 47 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to the sixth embodiment of the present invention; Figure 48 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at near focus according to the sixth embodiment of the present invention; the lens parameters of the endoscope objective 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-up: Total length: 8.33mm, Focal length: 0.82mm, Image height: 0.81mm, Field of view: 156°

[0213] 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, Figure 49 This is a schematic diagram illustrating the structure of the telephoto lens of an endoscope according to the seventh embodiment of the present invention; Figure 50 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at the telephoto focal length according to the seventh embodiment of the present invention; Figure 51 This is a schematic representation of the spherical aberration of the endoscope lens at its far focal point according to the seventh embodiment of the present invention; Figure 52 This is a schematic diagram showing the astigmatism and distortion of the telephoto lens of the endoscope according to the seventh embodiment of the present invention; Figure 53 This is a schematic diagram illustrating the structure of an endoscope lens in near focus according to a seventh embodiment of the present invention; Figure 54 This is a schematic representation of the magnification chromatic aberration diagram of the endoscope lens at near focus according to the seventh embodiment of the present invention;

[0215] Figure 55 This is a schematic representation of the spherical aberration of an endoscope lens at near focus according to the seventh embodiment of the present invention; Figure 56 This is a schematic diagram illustrating the astigmatism and distortion of an endoscope lens at near focus according to the seventh embodiment of the present invention; the lens parameters of the endoscope objective 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-up: Total length: 8.10mm, Focal length: 0.77mm, Image height: 0.81mm, Field of view: 156°

[0218] 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 can be combined in any way. For the sake of brevity, 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0221] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0222] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0223] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0224] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0225] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0226] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An endoscope objective (100), characterized in that, The endoscope objective (100) is composed of a first lens (110), a first cemented lens (120), a fourth lens (132), and a second cemented lens from the object plane to the image plane. The first cemented lens (120) is composed of a second lens (121) and a third lens (122) from the object plane to the image plane. The second cemented lens is composed of a fifth lens (133) and a sixth lens (134) from the object plane to the image plane. The first lens (110) has negative optical power, the first cemented lens (120) has positive optical power, the fourth lens (132) has positive optical power, and the second cemented lens has positive optical power. The first cemented lens (120) can move along the optical axis in the endoscope objective (100) such that the endoscope objective (100) satisfies the following condition: 15.00 < Fm / D < 35.00 Wherein, Fm is the focal length of the first cemented lens (120); and D is the value by which the first cemented lens (120) can move along the optical axis in the endoscope objective (100).

2. The endoscope objective (100) according to claim 1, characterized in that, The convex surface of the fourth lens (132) faces the image plane; the fourth lens (132) and the endoscope objective (100) satisfy the following condition: 0.50 <F4 / Fa<3.50 Wherein, F4 is the focal length of the fourth lens (132); Fa is the total focal length of the endoscope objective (100) at the telephoto position.

3. The endoscope objective (100) according to claim 1, characterized in that, The convex surface of the fourth lens (132) faces the image plane; the first cemented lens (120) and the fourth lens (132) satisfy the following condition: 1.00 <Fm / F4<7.50 Wherein, F4 is the focal length of the fourth lens (132).

4. The endoscope objective (100) according to claim 1, characterized in that, The second cemented lens and the fourth lens (132) satisfy the following condition: -30.00 <Fn / F4<20.00 Wherein, F4 is the focal length of the fourth lens (132), and Fn is the focal length of the second cemented lens.

5. The endoscope objective (100) according to claim 1, characterized in that, One of the fifth lens (133) and the sixth lens (134) has a positive optical power and the other has a negative optical power.

6. The endoscope objective (100) according to any one of claims 1 to 5, characterized in that, The second lens (121) has a positive or negative optical power, and the third lens (122) has a positive or negative optical power.

7. The endoscope objective (100) according to claim 5, characterized in that, The refractive indices of the fifth lens (133) and the sixth lens (134) satisfy the following condition: -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).

8. The endoscope objective (100) according to claim 5, characterized in that, The Abbe numbers of the fifth lens (133) and the sixth lens (134) satisfy the following condition: -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).

9. The endoscope objective (100) according to claim 6, 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 condition: -0.50 <Nd2-Nd3<0.00; Wherein, Nd2 is the refractive index of the lens with negative optical power in the second lens (121) and the third lens (122); and Nd3 is the refractive index of the lens with positive optical power in the second lens (121) and the third lens (122).

10. The endoscope objective (100) according to claim 6, 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 condition: 5.00 <Vd2- Vd3<35.00; Wherein, Vd2 is the Abbe number of the lens with negative optical power in the second lens (121) and the third lens (122); and Vd3 is the Abbe number of the lens with positive optical power in the second lens (121) and the third lens (122).

11. The endoscope objective (100) according to claim 1, characterized in that, On the image plane side of the sixth lens (134), the endoscope objective (100) further includes an infrared filter (135) and a chip protective 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.

12. The endoscope objective (100) according to claim 2, characterized in that, Between the object side of the fourth lens (132) and the first cemented lens (120), the endoscope objective (100) also includes an aperture stop (131).

13. An endoscope, characterized in that, include: The endoscope objective (100) as described in any one of claims 1 to 12.

14. An endoscope system, characterized in that, include: Light source device, imaging device, and endoscope as claimed in claim 13.

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