Medical high-definition endoscope objective optical system and endoscope optical system

Abstract

The utility model discloses a medical high-definition endoscope objective optical system and an endoscope optical system, the objective optical system is composed of protective glass, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side along an optical axis, and a diaphragm is arranged between the first lens and the second lens; wherein the first lens has negative focal power; the second lens has positive focal power; the third lens has negative focal power; the fourth lens has positive focal power; the fifth lens has negative focal power; the sixth lens has positive focal power; the second lens is glued with the third lens; and the fourth lens is glued with the fifth lens. The utility model has the advantages of simple structure, low cost, easy installation and high image quality.

Description

TECHNICAL FIELD

[0001] The utility model belongs to medical endoscope imaging technical field, concretely relates to a kind of medical high-definition endoscope objective optical system and endoscope optical system. BACKGROUND

[0002] Endoscopic optical system is used to obtain high-definition image, to help doctor observe the condition inside human body.Endoscopic optical system needs to ensure clear imaging, and also needs to adapt to narrow space and small size.Optical system includes objective system, relay system, eyepiece system and optical adapter.Objective system is used to collect image, relay system is used to image and control the overall length of endoscopic optical system to adapt to different medical scenarios, eyepiece system is used to magnify observation.

[0003] Traditional endoscopic optical system gradually exposes technical bottleneck in the following aspects:

[0004] Contradiction between imaging quality and high-definition demand: the existing objective optical system is generally less than 0.2 when spatial frequency is 147lp / mm, which is difficult to meet 1080P high-definition imaging standard.

[0005] Balancing problem between size and performance: in order to adapt to narrow cavity, endoscope needs to strictly control optical aperture (usually required ≤4mm) and overall length, but in existing technology, large field angle (≥80°) and large pupil diameter (≥0.27mm) design often lead to complex optical system structure.

[0006] Limitation of manufacturing cost and reliability: part of existing scheme adopts multiple aspherical lenses or special coating process to improve imaging performance, but such design significantly increases processing difficulty and cost.

[0007] Deficiency of optical parameter coordination optimization: in traditional design, matching of IH / f (image height to focal length ratio), FNO / TTL (aperture number to total length ratio) and other key parameters lacks systematic optimization, which leads to difficulty in meeting the requirements of high resolution, large field angle and small aperture at the same time.

[0008] Therefore, an endoscopic optical system with high imaging quality, compact structure, low cost and high reliability is needed to meet the urgent needs of modern medical scenarios for accurate diagnosis and efficient operation. SUMMARY

[0009] In order to solve the prior art existing shortage, the utility model provides a kind of medical high-definition endoscope objective optical system and endoscope optical system, objective optical system can satisfy simultaneously entrance pupil diameter ≥0.27mm, field angle ≥80 °, optical aperture ≤4mm, 0.62≤IH / f≤0.72, definition satisfies 1080P high-definition imaging;By objective optical system, relay system, eyepiece system are adapted, so that the objective optical system of this endoscope optical system and the light aperture of relay system ≤4mm, eyepiece optical system light aperture ≤6mm, simultaneously have the advantages of structure simplification, low cost, easy to install, high image quality.

[0010] The utility model discloses a kind of medical high-definition endoscope objective optical system, and the purpose is realized by the following technical solutions:

[0011] As the first aspect of the utility model, a kind of medical high-definition endoscope objective optical system is provided, which is composed of protective glass F1, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5 and sixth lens L6 arranged in order along the optical axis from the object side, and an aperture stop STO is arranged between the first lens L1 and the second lens L2;Wherein, the first lens L1 has negative focal power;The second lens L2 has positive focal power;The third lens L3 has negative focal power;The fourth lens L4 has positive focal power;The fifth lens L5 has negative focal power;The sixth lens L6 has positive focal power;The second lens and the third lens are glued;The fourth lens and the fifth lens are glued.

[0012] Further, the first lens L1 is concave on both sides;The third lens L3 is convex on both sides;The fourth lens L4 is convex on both sides;The fifth lens L5 is concave on both sides;The sixth lens L6 is convex on both sides.

[0013] Further, the optical parameters of the medical high-definition endoscope objective optical system satisfy the following relationship:

[0014] 0.62≤IH / f≤0.72

[0015] 3≤L≤4

[0016] 0.038≤IH / TTL≤0.046

[0017] 0.60≤LG1 / LG2≤0.77

[0018] 0.48≤d1 / f≤1.17

[0019] 0.97≤Bf / f≤1.39

[0020] 0.87≤|fL1 / f|≤1.10

[0021] 3.17≤|f23 / f|≤4.29

[0022] 2.30≤|f45 / f|≤4.35

[0023] 1.92≤|fL6 / f|≤2.37

[0024] 0.2≤FNO / TTL≤0.28

[0025] Wherein, f is the focal length of the medical high-definition endoscope objective optical system; IH is half of the image height of the medical high-definition endoscope objective optical system; L is the working distance of the medical high-definition endoscope objective optical system; TTL is the distance from the object side of the first lens to the imaging surface of the medical high-definition endoscope objective optical system on the optical axis; LG1 is the distance from the object side of the first lens to the diaphragm on the optical axis, LG2 is the distance from the diaphragm to the image side of the sixth lens on the optical axis; d1 is the central thickness of the first lens; Bf is the distance from the image side of the sixth lens to the imaging surface of the medical high-definition endoscope objective optical system on the optical axis; fL1 is the effective focal length of the first lens; f23 is the total effective focal length of the second and third lenses; f45 is the total effective focal length of the fourth and fifth lenses; fL6 is the effective focal length of the sixth lens; FNO is the aperture number of the medical high-definition endoscope objective optical system.

[0026] Further, the distance between the first lens and the second lens is 9mm-9.2mm; the distance between the third lens and the fourth lens is 6.4mm-7.0mm; the distance between the fifth lens and the sixth lens is 0.19mm-0.2mm.

[0027] As a second aspect of the utility model, provide a kind of endoscope objective optical system, it includes the objective optical system described in the utility model, still include relay system and eyepiece system, the objective optical system, relay system and eyepiece system are sequentially arranged by along optical axis from object side.

[0028] Further, the relay system includes front rod lens group and rear rod lens group, and the front rod lens group and the rear rod lens group are structurally identical and symmetrical along the central axis. The front rod lens group is composed of a seventh lens L7, an eighth lens L8 and a ninth lens L9 sequentially arranged along the optical axis from the object side. The eighth lens L8 has a positive focal power, and both sides are convex. The eighth lens L8 has a negative focal power. The ninth lens L9 has a negative focal power. The eighth lens and the ninth lens are glued together.

[0029] Further, the eyepiece system is composed of tenth transparent lens L10, eleventh transparent lens L11, twelfth lens L12, thirteenth lens L13 and fourteenth lens L14 arranged in sequence along the optical axis from the object; the tenth lens L10 has positive focal power; the eleventh lens L11 has negative focal power, and both sides thereof are concave; the twelfth lens L12 has positive focal power; the thirteenth lens L13 has negative focal power, and both sides thereof are concave; the fourteenth lens L14 has positive focal power, and both sides thereof are convex; the tenth lens and the eleventh lens are cemented together; and the thirteenth lens and the fourteenth lens are cemented together.

[0030] The utility model has the following beneficial effects:

[0031] The utility model provides a kind of medical high-definition endoscope objective optical system, when the spatial frequency is 147lp / mm, the full field of view MTF of optical system is greater than or equal to 0.2, satisfy 1080P high-definition imaging, imaging quality can reach diffraction limit, airy disk radius is greater than full field of view RMS radius, can simultaneously satisfy entrance pupil diameter greater than or equal to 0.27mm, field angle greater than or equal to 80 °, optical aperture less than or equal to 4mm, 0.62 less than or equal to IH / f less than or equal to 0.72, definition satisfies 1080P high-definition imaging.

[0032] The endoscope optical system provided by the utility model has the advantages of simple structure, low cost, easy installation and high image quality. BRIEF DESCRIPTION OF DRAWINGS

[0033] The utility model will be further described below in conjunction with the drawings:

[0034] Figure 1 It is a kind of medical high-definition endoscope objective optical system cross-sectional structure diagram described in embodiment 1 of the utility model;

[0035] Figure 2 It is the point array diagram of each field of view of the image surface of a kind of medical high-definition endoscope objective optical system described in embodiment 1 of the utility model;

[0036] Figure 3 It is the MTF curve of each field of view of the image surface of a kind of medical high-definition endoscope objective optical system described in embodiment 1 of the utility model;

[0037] Figure 4 It is the field curvature and distortion curve of each field of view of the image surface of a kind of medical high-definition endoscope objective optical system described in embodiment 1 of the utility model;

[0038] Figure 5 It is a kind of medical high-definition endoscope objective optical system cross-sectional structure diagram described in embodiment 2 of the utility model;

[0039] Figure 6The point array diagram of each field of view of the image surface of the medical high-definition endoscope objective optical system according to the utility model embodiment 2;

[0040] Figure 7 The MTF curve of each field of view of the image surface of the medical high-definition endoscope objective optical system according to the utility model embodiment 2;

[0041] Figure 8 The field curvature and distortion curve of each field of view of the image surface of the medical high-definition endoscope objective optical system according to the utility model embodiment 2;

[0042] Figure 9 The sectional structure diagram of the medical high-definition endoscope objective optical system according to the utility model embodiment 3;

[0043] Figure 10 The point array diagram of each field of view of the image surface of the medical high-definition endoscope objective optical system according to the utility model embodiment 3;

[0044] Figure 11 The MTF curve of each field of view of the image surface of the medical high-definition endoscope objective optical system according to the utility model embodiment 3;

[0045] Figure 12 The field curvature and distortion curve of each field of view of the image surface of the medical high-definition endoscope objective optical system according to the utility model embodiment 3;

[0046] Figure 13 The sectional structure diagram of the endoscope optical system according to the utility model embodiment 4;

[0047] In the figure,

[0048] G1-Objective optical system; G2-Relay system; G3-Eye lens system;

[0049] F1-Protective glass; L1-First lens; STO-Stop; L2-Second lens; L3-Third lens; L4-Fourth lens; L5-Fifth lens; L6-Sixth lens; L7-Seventh lens; L8-Eighth lens; L9-Ninth lens; L10-Tenth lens; L11-Eleventh lens; L12-Twelfth lens; L13-Thirteenth lens; L14-Fourteenth lens. DETAILED DESCRIPTION

[0050] In order to clearly describe the purpose, technical scheme and advantages of the embodiments of the utility model, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. It should be noted that the specific embodiments described here are only used to explain but not to limit the utility model.

[0051] Embodiment 1

[0052] As shown in Figures 1 to 4 The embodiment is a medical high-definition endoscope objective optical system, which is composed of a protection glass F1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 arranged in sequence along the optical axis from the object side, and a diaphragm STO arranged between the first lens L1 and the second lens L2; wherein the first lens L1 has a negative focal power, and both sides thereof are concave; the second lens L2 has a positive focal power; the third lens L3 has a negative focal power, and both sides thereof are convex; the fourth lens L4 has a positive focal power, and both sides thereof are convex; the fifth lens L5 has a negative focal power, and both sides thereof are concave; the sixth lens L6 has a positive focal power, and both sides thereof are convex; the second lens and the third lens are cemented together; and the fourth lens and the fifth lens are cemented together.

[0053] Further, the optical parameters of the medical high-definition endoscope objective optical system satisfy the following relationships:

[0054] 0.62≤IH / f≤0.72

[0055] 3≤L≤4

[0056] 0.038≤IH / TTL≤0.046

[0057] 0.60≤LG1 / LG2≤0.77

[0058] 0.48≤d1 / f≤1.17

[0059] 0.97≤Bf / f≤1.39

[0060] 0.87≤|fL1 / f|≤1.10

[0061] 3.17≤|f23 / f|≤4.29

[0062] 2.30≤|f45 / f|≤4.35

[0063] 1.92≤|fL6 / f|≤2.37

[0064] 0.2≤FNO / TTL≤0.28

[0065] Wherein, f is the focal length of the medical high-definition endoscope objective optical system; IH is half of the image height of the medical high-definition endoscope objective optical system; L is the working distance of the medical high-definition endoscope objective optical system; TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the medical high-definition endoscope objective optical system; LG1 is the distance on the optical axis from the object side of the first lens to the diaphragm; LG2 is the distance on the optical axis from the diaphragm to the image side of the sixth lens; d1 is the central thickness of the first lens; Bf is the distance on the optical axis from the image side of the sixth lens to the imaging surface of the medical high-definition endoscope objective optical system; fL1 is the effective focal length of the first lens; f23 is the total effective focal length of the second and third lenses; f45 is the total effective focal length of the fourth and fifth lenses; fL6 is the effective focal length of the sixth lens; FNO is the aperture number of the medical high-definition endoscope objective optical system.

[0066] Further, the distance between the first lens and the second lens is 9mm-9.2mm; the diaphragm is located between the first lens and the second lens; the distance between the third lens and the fourth lens is 6.4mm-7.0mm; the distance between the fifth lens and the sixth lens is 0.19mm-0.2mm.

[0067] The detailed parameters of the medical high-definition endoscope objective optical system of embodiment 1 are shown in Table 1. In Table 1, the focal length, refractive index and Abbe number of each lens at a reference wavelength of 587.6nm, and the same applies to other embodiments. The elements from the object surface (not shown in the figure) to the imaging surface are arranged in the order of the elements from top to bottom in Table 1. The first row of the first lens L1 represents the object side of the first lens L1, the second row represents the image side of the first lens L1, and so on. The first value in the "thickness" parameter column of the first lens L1 is the thickness of the first lens L1 on the optical axis, and the second value is the distance on the optical axis from the image side of the first lens L1 to the next surface in the image side direction (the object side of the second lens L2). The meanings of other values in the thickness parameter column can be inferred accordingly.

[0068] Table 1: Parameter table of the medical high-definition endoscope objective optical system of embodiment 1

[0069]

[0070]

[0071] The maximum field angle 2ω of embodiment 1 is 80°, the effective focal length f is 2.07, and the aperture number FNO is 7.68.

[0072] Embodiment 2

[0073] AsFigures 5 to 8 As shown, the embodiment is a medical high-definition endoscope objective optical system, which is composed of a protection glass F1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 arranged in sequence along the optical axis from the object side, and a diaphragm STO arranged between the first lens L1 and the second lens L2; wherein the first lens L1 has a negative focal power, and both sides thereof are concave; the second lens L2 has a positive focal power; the third lens L3 has a negative focal power, and both sides thereof are convex; the fourth lens L4 has a positive focal power, and both sides thereof are convex; the fifth lens L5 has a negative focal power, and both sides thereof are concave; the sixth lens L6 has a positive focal power, and both sides thereof are convex; the second lens and the third lens are cemented together; and the fourth lens and the fifth lens are cemented together.

[0074] Further, the optical parameters of the medical high-definition endoscope objective optical system satisfy the following relationships:

[0075] 0.62≤IH / f≤0.72

[0076] 3≤L≤4

[0077] 0.038≤IH / TTL≤0.046

[0078] 0.60≤LG1 / LG2≤0.77

[0079] 0.48≤d1 / f≤1.17

[0080] 0.97≤Bf / f≤1.39

[0081] 0.87≤|fL1 / f|≤1.10

[0082] 3.17≤|f23 / f|≤4.29

[0083] 2.30≤|f45 / f|≤4.35

[0084] 1.92≤|fL6 / f|≤2.37

[0085] 0.2≤FNO / TTL≤0.28

[0086] Wherein, f is the focal length of the medical high-definition endoscope objective optical system; IH is half of the image height of the medical high-definition endoscope objective optical system; L is the working distance of the medical high-definition endoscope objective optical system; TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the medical high-definition endoscope objective optical system; LG1 is the distance on the optical axis from the object side of the first lens to the diaphragm; LG2 is the distance on the optical axis from the diaphragm to the image side of the sixth lens; d1 is the central thickness of the first lens; Bf is the distance on the optical axis from the image side of the sixth lens to the imaging surface of the medical high-definition endoscope objective optical system; fL1 is the effective focal length of the first lens; f23 is the total effective focal length of the second and third lenses; f45 is the total effective focal length of the fourth and fifth lenses; fL6 is the effective focal length of the sixth lens; FNO is the aperture number of the medical high-definition endoscope objective optical system.

[0087] Further, the distance between the first lens and the second lens is 9mm-9.2mm; the diaphragm is located between the first lens and the second lens; the distance between the third lens and the fourth lens is 6.4mm-7.0mm; the distance between the fifth lens and the sixth lens is 0.19mm-0.2mm.

[0088] The detailed parameters of the medical high-definition endoscope objective optical system of embodiment 2 are shown in Table 2:

[0089] Table 2: Parameter table of the medical high-definition endoscope objective optical system of embodiment 2 Unit: mm

[0090] Face number r d nd vd Object plane ∞ 3.045 1 ∞ 1.000 1.77 71.7 2 ∞ 0.337 3 -5.004 1.500 2.00 28.3 4 2.334 9.001 5(S) ∞ 0.199 6 3.674 1.114 2.02 29.1 7 1.982 1.000 1.67 48.4 8 -10.410 6.408 9 6.735 1.000 1.52 59.5 10 -2.569 3.000 1.85 23.8 11 3.946 0.198 12 4.467 1.000 1.58 40.7 13 -3.249 2.000 Image plane ∞

[0091] The maximum field angle 2ω of embodiment 2 is 90°, the effective focal length f is 1.65, and the aperture number FNO is 6.15.

[0092] Embodiment 3

[0093] As Figures 9 to 12As shown, the embodiment is a medical high-definition endoscope objective optical system, which is composed of a protection glass F1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 arranged in sequence along the optical axis from the object side, and a diaphragm STO arranged between the first lens L1 and the second lens L2; wherein the first lens L1 has a negative focal power, and both sides thereof are concave; the second lens L2 has a positive focal power; the third lens L3 has a negative focal power, and both sides thereof are convex; the fourth lens L4 has a positive focal power, and both sides thereof are convex; the fifth lens L5 has a negative focal power, and both sides thereof are concave; the sixth lens L6 has a positive focal power, and both sides thereof are convex; the second lens and the third lens are cemented together; and the fourth lens and the fifth lens are cemented together.

[0094] Further, the optical parameters of the medical high-definition endoscope objective optical system satisfy the following relationships:

[0095] 0.62≤IH / f≤0.72

[0096] 3≤L≤4

[0097] 0.038≤IH / TTL≤0.046

[0098] 0.60≤LG1 / LG2≤0.77

[0099] 0.48≤d1 / f≤1.17

[0100] 0.97≤Bf / f≤1.39

[0101] 0.87≤|fL1 / f|≤1.10

[0102] 3.17≤|f23 / f|≤4.29

[0103] 2.30≤|f45 / f|≤4.35

[0104] 1.92≤|fL6 / f|≤2.37

[0105] 0.2≤FNO / TTL≤0.28

[0106] Wherein, f is the focal length of the medical high-definition endoscope objective optical system; IH is half the image height of the medical high-definition endoscope objective optical system; L is the working distance of the medical high-definition endoscope objective optical system; TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging surface of the medical high-definition endoscope objective optical system; LG1 is the distance on the optical axis from the object-side surface of the first lens to the aperture stop; LG2 is the distance on the optical axis from the aperture stop to the image-side surface of the sixth lens; d1 is the center thickness of the first lens; Bf is the distance on the optical axis from the image-side surface of the sixth lens to the imaging surface of the medical high-definition endoscope objective optical system; fL1 is the effective focal length of the first lens; f23 is the overall effective focal length of the second and third transparent lenses; f45 is the overall effective focal length of the fourth and fifth lenses; fL6 is the effective focal length of the sixth lens; and FNO is the aperture number of the medical high-definition endoscope objective optical system.

[0107] Furthermore, the distance between the first lens and the second lens is 9mm to 9.2mm; the aperture stop is located between the first lens and the second lens; the distance between the third lens and the fourth lens is 6.4mm to 7.0mm; and the distance between the fifth lens and the sixth lens is 0.19mm to 0.2mm.

[0108] Detailed parameters of the medical high-definition endoscope objective optical system described in Example 3 are shown in Table 3:

[0109] Table 3. Parameters of the Medical High-Definition Endoscope Objective Lens Optical System as Described in Example 3 (Unit: mm)

[0110] Face number r d nd vd Object plane ∞ 3.444 1 ∞ 0.999 1.77 71.7 2 ∞ 0.198 3 -5.561 1.676 2.00 28.3 4 2.245 9.000 5(S) ∞ 0.200 6 4.480 1.000 1.91 35.3 7 2.359 1.000 1.62 53.9 8 -7.395 7.000 9 4.440 1.000 1.52 64.2 10 -4.002 2.839 1.81 25.4 11 2.175 0.193 12 2.511 0.999 1.52 52.1 13 -2.863 2.000 Image plane ∞

[0111] Example 3 has a maximum field of view 2ω = 100°, an effective focal length f = 1.44, and an aperture number FNO = 5.38.

[0112] Example 4

[0113] like Figure 13 As shown, this embodiment is an endoscope optical system, which consists of an objective lens optical system G1, a relay system G2 and an eyepiece system G3 arranged sequentially along the optical axis from the object side.

[0114] The objective optical system G1 is composed of a protection glass F1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 arranged in order along the optical axis from the object side, a diaphragm STO is arranged between the first lens L1 and the second lens L2; wherein the first lens L1 has a negative focal power, both sides of which are concave; the second lens L2 has a positive focal power; the third lens L3 has a negative focal power, both sides of which are convex; the fourth lens L4 has a positive focal power, both sides of which are convex; the fifth lens L5 has a negative focal power, both sides of which are concave; the sixth lens L6 has a positive focal power, both sides of which are convex; the second lens and the third lens are cemented together; the fourth lens and the fifth lens are cemented together;

[0115] The relay system includes a front rod lens group and a rear rod lens group, the front rod lens group and the rear rod lens group are structurally identical and symmetrical along the central axis; the front rod lens group is composed of a seventh lens L7, an eighth lens L8 and a ninth lens L9 arranged in order along the optical axis from the object side; the eighth lens L8 has a positive focal power, both sides of which are convex; the eighth lens L8 has a negative focal power; the ninth lens L9 has a negative focal power; the eighth lens and the ninth lens are cemented together;

[0116] The eyepiece system is composed of a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13 and a fourteenth lens L14 arranged in order along the optical axis from the object side; the tenth lens L10 has a positive focal power; the eleventh lens L11 has a negative focal power, both sides of which are concave; the twelfth lens L12 has a positive focal power; the thirteenth lens L13 has a negative focal power, both sides of which are concave; the fourteenth lens L14 has a positive focal power, both sides of which are convex; the tenth lens and the eleventh lens are cemented together; the thirteenth lens and the fourteenth lens are cemented together.

[0117] The high-precision imaging system of the endoscope optical system described in the embodiment can realize high-fidelity image presentation in the target observation area through the combination of positive and negative lenses, and effectively suppresses the problems of dispersion and aberration. The optical elements of the system are all made of glass material, which has significant advantages over high-molecular resin material: its high light transmission property ensures excellent imaging resolution, and its natural anti-reflection ability reduces the need for traditional coating process, thereby simplifying the manufacturing process and improving productivity; the thermal stability of glass material meets the strict high-pressure sterilization requirements of medical devices, and also has excellent chemical corrosion resistance and surface hardness, which greatly improves the wear resistance and prolongs the service life. This material combination not only optimizes the optical performance indicators, but also meets the special standards of medical equipment in terms of health safety and durability.

[0118] Further, the optical parameters of the medical high-definition endoscope objective optical system satisfy the following relationship:

[0119] 0.62≤IH / f≤0.72

[0120] 3≤L≤4

[0121] 0.038≤IH / TTL≤0.046

[0122] 0.60≤LG1 / LG2≤0.77

[0123] 0.48≤d1 / f≤1.17

[0124] 0.97≤Bf / f≤1.39

[0125] 0.87≤|fL1 / f|≤1.10

[0126] 3.17≤|f23 / f|≤4.29

[0127] 2.30≤|f45 / f|≤4.35

[0128] 1.92≤|fL6 / f|≤2.37

[0129] 0.2≤FNO / TTL≤0.28

[0130] wherein, f is the focal length of the medical high-definition endoscope objective optical system; IH is half of the image height of the medical high-definition endoscope objective optical system; L is the working distance of the medical high-definition endoscope objective optical system; TTL is the distance from the object side surface of the first lens to the imaging surface of the medical high-definition endoscope objective optical system on the optical axis; LG1 is the distance from the object side surface of the first lens to the diaphragm on the optical axis, LG2 is the distance from the diaphragm to the image side surface of the sixth lens on the optical axis; d1 is the center thickness of the first lens; Bf is the distance from the image side surface of the sixth lens to the imaging surface of the medical high-definition endoscope objective optical system on the optical axis; fL1 is the effective focal length of the first lens; f23 is the total effective focal length of the second and third lenses; f45 is the total effective focal length of the fourth and fifth lenses; fL6 is the effective focal length of the sixth lens; FNO is the aperture number of the medical high-definition endoscope objective optical system.

[0131] Further, the diameters of the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are in the range of 1.4mm-4mm; and the diameters of the tenth, eleventh, twelfth, thirteenth, and fourteenth lenses are in the range of 3.1mm-6mm.

[0132] The above detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort, fall within the scope of the present application.

[0133] It should be noted that like numbers and letters refer to like items throughout the drawings, and once an item is defined in one drawing, it is not necessary to further define and explain it in the subsequent drawings.

[0134] The above only represents the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A medical high-definition endoscope objective optical system characterized by comprising: Consist of protection glass F1, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5 and sixth lens L6 arranged in order along the optical axis from the object side, the first lens L1 and the second lens L2 are provided with a diaphragm STO; wherein, the first lens L1 has negative focal power; the second lens L2 has positive focal power; the third lens L3 has negative focal power; the fourth lens L4 has positive focal power; the fifth lens L5 has negative focal power; the sixth lens L6 has positive focal power; the second lens and the third lens are cemented; the fourth lens and the fifth lens are cemented.

2. The medical high-definition endoscope objective optical system according to claim 1, wherein The first lens L1 is concave on both sides; the third lens L3 is convex on both sides; the fourth lens L4 is convex on both sides; the fifth lens L5 is concave on both sides; the sixth lens L6 is convex on both sides.

3. The medical high-definition endoscope objective optical system according to claim 1, wherein The optical parameters of the medical high-definition endoscope objective optical system satisfy the following relationships: 0.62≤IH / f≤0.72 3≤L≤4 0.038≤IH / TTL≤0.046 0.60≤LG1 / LG2≤0.77 0.48≤d1 / f≤1.17 0.97≤Bf / f≤1.39 0.87≤|fL1 / f|≤1.10 3.17≤|f23 / f|≤4.29 2.30≤|f45 / f|≤4.35 1.92≤|fL6 / f|≤2.37 0.2≤FNO / TTL≤0.28 Wherein, f is the focal length of the medical high-definition endoscope objective optical system; IH is half of the image height of the medical high-definition endoscope objective optical system; L is the working distance of the medical high-definition endoscope objective optical system; TTL is the distance from the object side of the first lens to the imaging surface of the medical high-definition endoscope objective optical system on the optical axis; LG1 is the distance from the object side of the first lens to the diaphragm on the optical axis, LG2 is the distance from the diaphragm to the image side of the sixth lens on the optical axis; d1 is the center thickness of the first lens; Bf is the distance from the image side of the sixth lens to the imaging surface of the medical high-definition endoscope objective optical system on the optical axis; fL1 is the effective focal length of the first lens; f23 is the total effective focal length of the second lens and the third lens; f45 is the total effective focal length of the fourth lens and the fifth lens; fL6 is the effective focal length of the sixth lens; FNO is the aperture number of the medical high-definition endoscope objective optical system.

4. The medical high-definition endoscope objective optical system according to claim 1, wherein The distance between the first lens and the second lens is 9mm-9.2mm; the distance between the third lens and the fourth lens is 6.4mm-7.0mm; the distance between the fifth lens and the sixth lens is 0.19mm-0.2mm.

5. An endoscope objective optical system characterized by comprising: It includes the objective optical system as claimed in any one of claims 1-4, and further includes a relay system and an eyepiece system, which are arranged in order along the optical axis from the object side.

6. An endoscope objective optical system as set forth in claim 5, wherein The relay system comprises a front rod lens group and a rear rod lens group, the front rod lens group and the rear rod lens group are structurally identical and symmetrical along the central axis; the front rod lens group is composed of a seventh lens L7, an eighth lens L8 and a ninth lens L9 arranged in sequence from the object side along the optical axis; the eighth lens L8 has positive focal power, and both sides thereof are convex; the eighth lens L8 has negative focal power; the ninth lens L9 has negative focal power; the eighth lens and the ninth lens are cemented.

7. An endoscope objective optical system as set forth in claim 5, wherein The eyepiece system is composed of a tenth lens L10, an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13 and a fourteenth lens L14 arranged in sequence from the object side along the optical axis; the tenth lens L10 has positive focal power; the eleventh lens L11 has negative focal power, and both sides thereof are concave; the twelfth lens L12 has positive focal power; the thirteenth lens L13 has negative focal power, and both sides thereof are concave; the fourteenth lens L14 has positive focal power, and both sides thereof are convex; the tenth lens and the eleventh lens are cemented; the thirteenth lens and the fourteenth lens are cemented.

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