Coupler and endoscope
By designing a coupler including an optical imaging mirror group and adjusting the position of the fourth lens with a motor, the imaging clarity of the endoscope at any position within a large depth of field range is achieved, and the problem of insufficient imaging clarity in the endoscope in the prior art is solved.
Patent Information
- Application Number
- CN202311120070.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-08-31
- Publication Date
- 2025-02-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The endoscope has a large depth of field range, and existing couplers are difficult to ensure imaging clarity at any position within a large depth of field range, affecting the observation of biological tissue.
A coupler including an optical imaging mirror group is designed, and the arrangement order of the mirror group along the optical axis direction is: a first lens with a meniscus shape with a negative power, a second lens with a meniscus shape with a positive power, a third lens with a biconvex shape with a negative power, a fourth lens with a biconvex shape with a positive power, a fifth lens with a flat convex shape with a negative power, and a sixth lens with a meniscus shape with a positive power, and a motor is controlled by a motor to change the position of the fourth lens in the optical axis direction to realize electric focus.
Through electric focus, the imaging clarity of the endoscope at any position within a large depth of field range is achieved, and the observation effect of biological tissue is improved.
Smart Images
Figure CN119535763A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of optical imaging technology, and in particular to a coupler and an endoscope. Background Art
[0002] An endoscope can be used to observe biological tissues so that doctors can check whether the biological tissues are diseased and the location of the diseased tissues. In order to observe the biological tissues more clearly, a coupler can be installed at the front end of the endoscope.
[0003] However, the depth of field of the endoscope is relatively large, and the current coupler cannot guarantee the imaging clarity of the endoscope at any position within the large depth of field, which affects the observation of biological tissues. Summary of the invention
[0004] Based on this, it is necessary to provide a coupler and an endoscope to address the above technical problems.
[0005] The present application provides a coupler, the coupler comprising an optical imaging lens group, the arrangement order of the optical imaging lens group along the optical axis direction from the aperture to the imaging surface is:
[0006] A first lens having a meniscus concave shape with negative power, a second lens having a meniscus concave shape with positive power, a third lens having a biconvex shape with negative power, a fourth lens having a biconvex shape with positive power, a fifth lens having a plano-concave shape with negative power, and a sixth lens having a meniscus convex shape with positive power;
[0007] The fourth lens is controlled by a motor; the motor is used to change the position of the fourth lens in the direction of the optical axis.
[0008] In one embodiment, the optical imaging lens assembly further includes: a seventh lens having a meniscus shape and positive optical power, and the seventh lens is located between the fourth lens and the fifth lens.
[0009] In one embodiment, the seventh lens is cemented to the fourth lens.
[0010] In one embodiment, when the optical imaging lens group includes the seventh lens, the thicknesses of the fourth lens, the fifth lens and the sixth lens included in the optical imaging lens group are smaller than the thicknesses of the fourth lens, the fifth lens and the sixth lens included in the optical imaging lens group when the optical imaging lens group does not include the seventh lens.
[0011] In one embodiment, the optical imaging lens assembly further includes: a meniscus-shaped eighth lens with positive optical power, and the eighth lens is located between the first lens and the second lens.
[0012] In one embodiment, the eighth lens and the first lens are cemented together.
[0013] In one embodiment, when the optical imaging lens group further includes the eighth lens, the thickness of the first lens included in the optical imaging lens group is less than the thickness of the first lens included in the optical imaging lens group when the optical imaging lens group does not include the eighth lens.
[0014] In one embodiment, the optical imaging lens assembly further includes: a ninth lens having a meniscus shape and positive optical power, and the ninth lens is located between the fifth lens and the sixth lens.
[0015] In one embodiment, the ninth lens and the sixth lens are cemented together.
[0016] In one embodiment, when the optical imaging lens group includes the ninth lens, the thickness of the sixth lens included in the optical imaging lens group is less than the thickness of the sixth lens included in the optical imaging lens group when the optical imaging lens group does not include the ninth lens.
[0017] In one embodiment, the ratio of focal length to entrance pupil diameter varies in a range greater than or equal to 6 and less than or equal to 11.
[0018] In one embodiment, the second lens and the third lens are cemented together.
[0019] The present application provides an endoscope, which includes a coupler according to any one of the above-mentioned embodiments.
[0020] The coupler provided in the present application can be used for an endoscope, which includes an optical imaging lens group, and the arrangement order of the optical imaging lens group along the optical axis from the aperture to the imaging surface is: a first lens with a meniscus concave shape with negative optical focal length, a second lens with a meniscus concave shape with positive optical focal length, a third lens with a biconvex shape with negative optical focal length, a fourth lens with a biconvex shape with positive optical focal length, a fifth lens with a plano-concave shape with negative optical focal length, and a sixth lens with a meniscus convex shape with positive optical focal length; wherein the fourth lens is controlled by a motor, and the motor can change the position of the fourth lens in the direction of the optical axis, thereby realizing electric focusing and focusing on the position included in the depth of field range. In summary, the embodiments of the present application can achieve imaging clarity at any position of the endoscope within a large depth of field. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 is a schematic structural diagram of a coupler in one embodiment;
[0022] Figure 2(a) shows Figure 1 The MTF modulation variation curve of the coupler shown at a depth of field of 15 mm;
[0023] Figure 2(b) shows Figure 1 The MTF modulation variation curve of the coupler shown at a depth of field of 20 mm;
[0024] Figure 2(c) shows Figure 1 The MTF modulation variation curve of the coupler shown at a depth of field of 40 mm;
[0025] Figure 2(d) shows Figure 1 The MTF modulation variation curve of the coupler shown at a depth of field of 160 mm;
[0026] Figure 3(a) shows Figure 1 The spot diagram of the coupler shown is at 15mm within the depth of field;
[0027] Figure 3(b) shows Figure 1 The spot diagram of the coupler shown is at 20 mm within the depth of field;
[0028] Figure 3(c) shows Figure 1 The spot diagram of the coupler shown is at 40mm within the depth of field;
[0029] Figure 3(d) shows Figure 1 The spot diagram of the coupler shown is at 160mm within the depth of field;
[0030] Figure 4(a) shows Figure 1 The field curvature distortion diagram of the coupler shown is at 15mm within the depth of field;
[0031] Figure 4(b) shows Figure 1 The field curvature distortion diagram of the coupler shown is at 20mm within the depth of field;
[0032] Figure 4(c) shows Figure 1 The field curvature distortion diagram of the coupler shown is at 40mm within the depth of field;
[0033] Figure 4(d) shows Figure 1 The field curvature distortion diagram of the coupler shown is at 160mm within the depth of field;
[0034] Figure 5(a) shows Figure 1 The aberration analysis diagram of the coupler shown is at 15mm within the depth of field;
[0035] Figure 5(b) shows Figure 1 The aberration analysis diagram of the coupler shown is at 20mm within the depth of field;
[0036] Figure 5(c) shows Figure 1 The aberration analysis diagram of the coupler shown is at 40mm within the depth of field;
[0037] Figure 5(d) shows Figure 1 The aberration analysis diagram of the coupler shown is at 160mm within the depth of field;
[0038] Figure 6 is a schematic structural diagram of a coupler in another embodiment;
[0039] Figure 7(a) shows Figure 6 The MTF modulation variation curve of the coupler shown at a depth of field of 15 mm;
[0040] Figure 7(b) shows Figure 6 The MTF modulation variation curve of the coupler shown at a depth of field of 20 mm;
[0041] Figure 7(c) shows Figure 6 The MTF modulation variation curve of the coupler shown at a depth of field of 40 mm;
[0042] Figure 7(d) shows Figure 6 The MTF modulation variation curve of the coupler shown at a depth of field of 160 mm;
[0043] Figure 8(a) shows Figure 6 The spot diagram of the coupler shown is at 15mm within the depth of field;
[0044] Figure 8(b) shows Figure 6 The spot diagram of the coupler shown is at 20 mm within the depth of field;
[0045] Figure 8(c) shows Figure 6 The spot diagram of the coupler shown is at 40mm within the depth of field;
[0046] Figure 8(d) shows Figure 6 The spot diagram of the coupler shown is at 160mm within the depth of field;
[0047] Figure 9(a) shows Figure 6 The field curvature distortion diagram of the coupler shown is at 15mm within the depth of field;
[0048] Figure 9(b) shows Figure 6 The field curvature distortion diagram of the coupler shown is at 20mm within the depth of field;
[0049] Figure 9(c) shows Figure 6 The field curvature distortion diagram of the coupler shown is at 40mm within the depth of field;
[0050] Figure 9(d) shows Figure 6 The field curvature distortion diagram of the coupler shown is at 160mm within the depth of field;
[0051] Figure 10(a) shows Figure 6 The aberration analysis diagram of the coupler shown is at 15mm within the depth of field;
[0052] Figure 10(b) shows Figure 6 The aberration analysis diagram of the coupler shown is at 20mm within the depth of field;
[0053] Figure 10(c) shows Figure 6 The aberration analysis diagram of the coupler shown is at 40mm within the depth of field;
[0054] Figure 10(d) shows Figure 6 The aberration analysis diagram of the coupler shown is at 160mm within the depth of field;
[0055] Fig.11 is a schematic structural diagram of a coupler in another embodiment;
[0056] Figure 12(a) shows Fig.11 The MTF modulation variation curve of the coupler shown at a depth of field of 15 mm;
[0057] Figure 12(b) shows Fig.11 The MTF modulation variation curve of the coupler shown at a depth of field of 20 mm;
[0058] Figure 12(c) shows Fig.11 The MTF modulation variation curve of the coupler shown at a depth of field of 40 mm;
[0059] Figure 12(d) shows Fig.11 The MTF modulation variation curve of the coupler shown at a depth of field of 160 mm;
[0060] Figure 13(a) shows Fig.11 The spot diagram of the coupler shown is at 15mm within the depth of field;
[0061] Figure 13(b) shows Fig.11 The spot diagram of the coupler shown is at 20 mm within the depth of field;
[0062] Figure 13(c) shows Fig.11 Spot diagram of the coupler shown at 40mm depth of field
[0063] Figure 13(d) shows Fig.11 The spot diagram of the coupler shown is at 160mm within the depth of field;
[0064] Figure 14(a) shows Fig.11 The field curvature distortion diagram of the coupler shown is at 15mm within the depth of field;
[0065] Figure 14(b) shows Fig.11 The field curvature distortion diagram of the coupler shown is at 20mm within the depth of field;
[0066] Figure 14(c) shows Fig.11 The field curvature distortion diagram of the coupler shown is at 40mm within the depth of field;
[0067] Figure 14(d) shows Fig.11 The field curvature distortion diagram of the coupler shown is at 160mm within the depth of field;
[0068] Figure 15(a) shows Fig.11 The aberration analysis diagram of the coupler shown is at 15mm within the depth of field;
[0069] Figure 15(b) shows Fig.11 The aberration analysis diagram of the coupler shown is at 20mm within the depth of field;
[0070] Figure 15(c) shows Fig.11 The aberration analysis diagram of the coupler shown is at 40mm within the depth of field;
[0071] Figure 15(d) shows Fig.11 The aberration analysis diagram of the coupler shown is at 160mm within the depth of field;
[0072] Fig.16 is a schematic structural diagram of a coupler in another embodiment;
[0073] Figure 17(a) shows Fig.16 The MTF modulation variation curve of the coupler shown at a depth of field of 15 mm;
[0074] Figure 17(b) shows Fig.16 The MTF modulation variation curve of the coupler shown at a depth of field of 20 mm;
[0075] Figure 17(c) shows Fig.16 The MTF modulation variation curve of the coupler shown at a depth of field of 40 mm;
[0076] Figure 17(d) shows Fig.16 The MTF modulation variation curve of the coupler shown at a depth of field of 160 mm;
[0077] Figure 18(a) shows Fig.16 The spot diagram of the coupler shown is at 15mm within the depth of field;
[0078] Figure 18(b) shows Fig.16 The spot diagram of the coupler shown is at 20 mm within the depth of field;
[0079] Figure 18(c) shows Fig.16 The spot diagram of the coupler shown is at 40mm within the depth of field;
[0080] Figure 18(d) Fig.16The spot diagram of the coupler shown is at 160mm within the depth of field;
[0081] Figure 19(a) shows Fig.16 The field curvature distortion diagram of the coupler shown is at 15mm within the depth of field;
[0082] Figure 19(b) shows Fig.16 The field curvature distortion diagram of the coupler shown is at 20mm within the depth of field;
[0083] Figure 19(c) shows Fig.16 The field curvature distortion diagram of the coupler shown is at 40mm within the depth of field;
[0084] Figure 19(d) shows Fig.16 The field curvature distortion diagram of the coupler shown is at 160mm within the depth of field;
[0085] Figure 20(a) shows Fig.16 The aberration analysis diagram of the coupler shown is at 15mm within the depth of field;
[0086] Figure 20(b) shows Fig.16 The aberration analysis diagram of the coupler shown is at 20mm within the depth of field;
[0087] Figure 20(c) shows Fig.16 The aberration analysis diagram of the coupler shown is at 40mm within the depth of field;
[0088] Figure 20(d) shows Fig.16 The aberration analysis diagram of the coupler shown is at 160mm within the depth of field;
[0089] Fig.21 is a schematic structural diagram of a coupler in another embodiment;
[0090] Figure 22(a) shows Fig.21 The MTF modulation variation curve of the coupler shown at a depth of field of 15 mm;
[0091] Figure 22(b) shows Fig.21 The MTF modulation variation curve of the coupler shown at a depth of field of 20 mm;
[0092] Figure 22(c) shows Fig.21 The MTF modulation variation curve of the coupler shown at a depth of field of 40 mm;
[0093] Figure 22(d) shows Fig.21 The MTF modulation variation curve of the coupler shown at a depth of field of 160 mm;
[0094] Figure 23(a) shows Fig.21 The spot diagram of the coupler shown is at 15mm within the depth of field;
[0095] Figure 23(b) shows Fig.21 The spot diagram of the coupler shown is at 20 mm within the depth of field;
[0096] Figure 23(c) shows Fig.21 The spot diagram of the coupler shown is at 40mm within the depth of field;
[0097] Figure 23(d) Fig.21 The spot diagram of the coupler shown is at 160mm within the depth of field;
[0098] Figure 24(a) shows Fig.21 The field curvature distortion diagram of the coupler shown is at 15mm within the depth of field;
[0099] Figure 24(b) shows Fig.21 The field curvature distortion diagram of the coupler shown is at 20mm within the depth of field;
[0100] Figure 24(c) shows Fig.21 The field curvature distortion diagram of the coupler shown is at 40mm within the depth of field;
[0101] Figure 24(d) Fig.21 The field curvature distortion diagram of the coupler shown is at 160mm within the depth of field;
[0102] Figure 25(a) shows Fig.21 The aberration analysis diagram of the coupler shown is at 15mm within the depth of field;
[0103] Figure 25(b) shows Fig.21 The aberration analysis diagram of the coupler shown is at 20mm within the depth of field;
[0104] Figure 25(c) shows Fig.21 The aberration analysis diagram of the coupler shown is at 40mm within the depth of field;
[0105] Figure 25(d) Fig.21 The aberration analysis diagram of the coupler is shown at 160mm within the depth of field. DETAILED DESCRIPTION
[0106] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0107] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.
[0108] The present application provides a coupler that can be used in an endoscope system. It can perform electric focusing according to the distance between the endoscope and biological tissue. The distance between the lens groups of the coupler is adjusted by a motor so that the endoscope can image clearly at different positions within a large depth of field; the large depth of field range is such as a depth of field range of 15 to 160 mm.
[0109] The coupler includes an optical imaging lens assembly, referring to Figure 1 The arrangement order of the optical imaging lens group along the optical axis from the aperture to the imaging surface 109 is: a first lens 101 with a meniscus concave shape having a negative optical focal length, a second lens 102 with a meniscus concave shape having a positive optical focal length, a third lens 103 with a biconvex shape having a negative optical focal length, a fourth lens 104 with a biconvex shape having a positive optical focal length, a fifth lens 105 with a plano-concave shape having a negative optical focal length, and a sixth lens 106 with a meniscus convex shape having a positive optical focal length; the fourth lens 104 is controlled by a motor; and the motor is used to change the position of the fourth lens 104 in the optical axis direction.
[0110] The light passes through the first lens 101 , the second lens 102 , the third lens 103 , the fourth lens 104 , the fifth lens 105 , and the sixth lens 106 in sequence, and forms an image on the imaging plane 109 .
[0111] The second lens 102 and the third lens 103 may be cemented together.
[0112] The imaging surface 109 is the surface where the detector chip is located. In some embodiments, the detector chip may be a 1 / 1.8 inch chip with a 4K resolution.
[0113] In addition, in order to ensure the focusing accuracy, a rear fixing group can be set between the sixth lens 106 and the imaging surface 109. In some embodiments, the rear fixing group includes a protective sheet to protect each lens and the detector chip. The number of protective sheets can be determined according to actual needs. In one embodiment, two protective sheets can be set, such as Figure 1 Protective sheets 107 and 108 are shown.
[0114] By driving and controlling the rotation of the motor, the fourth lens 104 is displaced in the direction of the optical axis, and the distance between the fourth lens 104 and the front and rear lenses is changed, so as to adjust the focal length of the system and realize electric focusing. The positions of other lenses in the direction of the optical axis can remain unchanged. The electric focusing can be in the form of a handle button, so that the doctor can operate it with one hand. The embodiment of the present application does not impose too many restrictions on the type of motor and the specific motor parameters (such as adjustment stroke, sensitivity, size and tension, etc.), which can be determined according to actual needs.
[0115] In some specific embodiments, the motor type may be a voice coil motor. In some specific embodiments, the motor parameters may include but are not limited to: an adjustment stroke of 0.55 mm, a sensitivity of 3.3±0.5 μm / mA, a motor size of 13.7*13.2*3.5 mm, and a maximum pulling force of 3N.
[0116] In the present application, the position of the fourth lens 104 in the optical axis direction is adjusted, and compared with adjusting other lenses, the desired imaging effect can be achieved with a smaller moving distance.
[0117] In some embodiments, in order to verify the effect of the coupler in the embodiment of the present application, four positions can be selected within the depth of field range of the endoscope system, such as 15 mm, 20 mm, 40 mm, and 160 mm, and the endoscope system can be optimized. The imaging quality obtained by adjusting the fourth lens 104 by the motor at different positions is as follows: Figure 2(a) to Figure 5(d) shown. Figure 2(a) to Figure 2(d) The MTF modulation change curve at different positions between 0 and 200 lp / mm. The vertical axis of the MTF modulation change curve is the OTF modulus (English name is Modulus of the OTF), and the horizontal axis is the spatial frequency (English name is Spatial Frequency). This application does not limit the unit of spatial frequency. In this embodiment, the unit of spatial frequency can be set to cycle / mm. Figure 2(a) is Figure 1 The MTF modulation curve of the coupler at 15mm in the depth of field is shown in Figure 2(b). Figure 1 The MTF modulation curve of the coupler at 20mm in the depth of field is shown in Figure 2(c). Figure 1 The MTF modulation curve of the coupler at 40mm in the depth of field is shown in Figure 2(d). Figure 1 The MTF modulation curve of the coupler at 160mm within the depth of field is shown in Figure 3(a). Figure 1 The spot diagram of the coupler at 15 mm in the depth of field is shown in Figure 3(b). Figure 1 The spot diagram of the coupler at 20 mm in the depth of field is shown in Figure 3(c). Figure 1The spot diagram of the coupler at 40 mm in the depth of field is shown in Figure 3(d). Figure 1 The spot diagram of the coupler at 160mm in the depth of field is shown in Figure 4(a). Figure 1 The field curvature distortion diagram of the coupler at 15mm in the depth of field is shown in Figure 4(b). Figure 1 The field curvature distortion diagram of the coupler at 20mm in the depth of field is shown in Figure 4(c). Figure 1 The field curvature distortion diagram of the coupler at 40mm within the depth of field is shown in Figure 4(d). Figure 1 The field curvature distortion diagram of the coupler at 160mm within the depth of field is shown in Figure 5(a). Figure 1 The aberration analysis diagram of the coupler at 15mm in the depth of field is shown in Figure 5(b). Figure 1 The aberration analysis diagram of the coupler at 20mm in the depth of field is shown in Figure 5(c). Figure 1 The aberration analysis diagram of the coupler at 40mm in the depth of field is shown in Figure 5(d). Figure 1 The aberration analysis diagram of the coupler is shown at 160mm within the depth of field.
[0118] In one embodiment, referring to Figure 6 The optical imaging lens group further includes: a seventh lens 110 having a meniscus shape and positive optical power, and the seventh lens is located between the fourth lens 104 and the fifth lens 105.
[0119] The seventh lens 110 and the fourth lens 104 may be glued together.
[0120] When the optical imaging lens group includes the seventh lens 110, the thicknesses of the fourth lens 104, the fifth lens 105 and the sixth lens 106 included in the optical imaging lens group are smaller than the thicknesses of the fourth lens 104, the fifth lens 105 and the sixth lens 106 included in the optical imaging lens group when the optical imaging lens group does not include the seventh lens 110.
[0121] After the seventh lens 110 is provided between the fourth lens 104 and the fifth lens 105 , the thickness of each of the fourth lens 104 , the fifth lens 105 , and the sixth lens 106 becomes smaller.
[0122] In some embodiments, in order to verify the effect of the coupler in the embodiment of the present application, four positions can be selected within the depth of field range of the endoscope system, such as 15 mm, 20 mm, 40 mm, and 160 mm, and the endoscope system can be optimized. The imaging quality obtained by adjusting the fourth lens 104 by the motor at different positions is as follows: Figure 7(a) to Figure 10(d) shown. Figure 7(a) to Figure 7(d) Figure 7(a) is the MTF modulation variation curve at different positions between 0 and 200lp / mm. Figure 6 The MTF modulation curve of the coupler at 15mm in the depth of field is shown in Figure 7(b). Figure 6 The MTF modulation curve of the coupler at 20mm in the depth of field is shown in Figure 7(c). Figure 6 The MTF modulation curve of the coupler at 40mm in the depth of field is shown in Figure 7(d). Figure 6 The MTF modulation curve of the coupler at 160mm within the depth of field is shown in Figure 8(a). Figure 6 The spot diagram of the coupler at 15 mm in the depth of field is shown in Figure 8(b). Figure 6 The spot diagram of the coupler at 20 mm in the depth of field is shown in Figure 8(c). Figure 6 The spot diagram of the coupler at 40 mm in the depth of field is shown in Figure 8(d). Figure 6 The spot diagram of the coupler at 160mm in the depth of field is shown in Figure 9(a). Figure 6 The field curvature distortion diagram of the coupler at 15mm in the depth of field is shown in Figure 9(b). Figure 6 The field curvature distortion diagram of the coupler at 20mm in the depth of field is shown in Figure 9(c). Figure 6 The field curvature distortion diagram of the coupler at 40mm in the depth of field is shown in Figure 9(d). Figure 6 The field curvature distortion diagram of the coupler at 160mm within the depth of field is shown in Figure 10(a). Figure 6 The aberration analysis diagram of the coupler at 15mm in the depth of field is shown in Figure 10(b). Figure 6 The aberration analysis diagram of the coupler at 20mm in the depth of field is shown in Figure 10(c). Figure 6 The aberration analysis diagram of the coupler at 40mm in the depth of field is shown in Figure 10(d). Figure 6 The aberration analysis diagram of the coupler is shown at 160mm within the depth of field.
[0123] In one embodiment, referring to Fig.11 The optical imaging lens group further includes: a meniscus-shaped eighth lens 111 with positive optical power, and the eighth lens 111 is located between the first lens 101 and the second lens 102.
[0124] The eighth lens 111 and the first lens 101 may be glued together.
[0125] When the optical imaging lens assembly further includes the eighth lens 111 , the thickness of the first lens 101 included in the optical imaging lens assembly is smaller than the thickness of the first lens 101 included in the optical imaging lens assembly when the optical imaging lens assembly does not include the eighth lens 111 .
[0126] After the eighth lens 111 is disposed between the first lens 101 and the second lens 102 , the thickness of the first lens 101 becomes smaller.
[0127] Refer again Fig.11 The coupler provided in this embodiment includes an optical imaging lens group, and the arrangement order of the optical imaging lens group along the optical axis from the aperture to the imaging surface 109 is: a first lens 101, an eighth lens 111, a second lens 102, a third lens 103, a fourth lens 104, a seventh lens 110, a fifth lens 105, a sixth lens 106, a protective sheet 107 and a protective sheet 108.
[0128] The first lens 101 and the eighth lens 111 are glued together, the second lens 102 and the third lens 103 are glued together, and the fourth lens 104 and the seventh lens 110 are glued together.
[0129] In some embodiments, in order to verify the effect of the coupler in the embodiment of the present application, four positions can be selected within the depth of field range of the endoscope system, such as 15 mm, 20 mm, 40 mm, and 160 mm, and the endoscope system can be optimized. The imaging quality obtained by adjusting the fourth lens 104 by the motor at different positions is as follows: Figure 12(a) to Figure 15(d) shown. Figure 12(a) to Figure 12(d) Figure 12(a) is the MTF modulation variation curve at different positions between 0 and 200 lp / mm. Fig.11 The MTF modulation curve of the coupler at 15mm in the depth of field is shown in Figure 12(b). Fig.11 The MTF modulation curve of the coupler at 20mm in the depth of field is shown in Figure 12(c). Fig.11 The MTF modulation curve of the coupler at 40mm in the depth of field is shown in Figure 12(d). Fig.11 The MTF modulation curve of the coupler at 160mm within the depth of field is shown in Figure 13(a). Fig.11 The spot diagram of the coupler at 15 mm in the depth of field is shown in Figure 13(b). Fig.11 The spot diagram of the coupler at 20 mm in the depth of field is shown in Figure 13(c). Fig.11 The spot diagram of the coupler at 40 mm in the depth of field is shown in Figure 13(d). Fig.11 The spot diagram of the coupler at 160 mm in the depth of field is shown in Figure 14(a). Fig.11 The field curvature distortion diagram of the coupler at 15mm in the depth of field is shown in Figure 14(b). Fig.11 The field curvature distortion diagram of the coupler at 20mm in the depth of field is shown in Figure 14(c). Fig.11The field curvature distortion diagram of the coupler at 40mm within the depth of field is shown in Figure 14(d). Fig.11 The field curvature distortion diagram of the coupler at 160mm within the depth of field is shown in Figure 15(a). Fig.11 The aberration analysis diagram of the coupler at 15mm in the depth of field is shown in Figure 15(b). Fig.11 The aberration analysis diagram of the coupler at 20mm in the depth of field is shown in Figure 15(c). Fig.11 The aberration analysis diagram of the coupler at 40mm in the depth of field is shown in Figure 15(d). Fig.11 The aberration analysis diagram of the coupler is shown at 160mm within the depth of field.
[0130] In one embodiment, referring to Fig.16 The optical imaging lens assembly further includes: a ninth lens 112 having a meniscus shape and positive optical power, and the ninth lens 112 is located between the fifth lens 105 and the sixth lens 106 .
[0131] When the optical imaging lens assembly includes the ninth lens 112 , the thickness of the sixth lens 106 included in the optical imaging lens assembly is smaller than the thickness of the sixth lens 106 included in the optical imaging lens assembly when the optical imaging lens assembly does not include the ninth lens 112 .
[0132] After the ninth lens 112 is disposed between the fifth lens 105 and the sixth lens 106 , the thickness of the sixth lens 106 becomes smaller.
[0133] Refer again Fig.16 The coupler provided in this embodiment includes an optical imaging lens group, and the arrangement order of the optical imaging lens group along the optical axis from the aperture to the imaging surface 109 is: a first lens 101, an eighth lens 111, a second lens 102, a third lens 103, a fourth lens 104, a seventh lens 110, a fifth lens 105, a ninth lens 112, a sixth lens 106, a protective sheet 107 and a protective sheet 108.
[0134] The first lens 101 and the eighth lens 111 are glued together, the second lens 102 and the third lens 103 are glued together, and the fourth lens 104 and the seventh lens 110 are glued together.
[0135] The coupler satisfies the following conditions: assuming the entrance pupil diameter is D, then 1mm≤D≤5mm; assuming the focal length of the coupler is F, then the ratio of the focal length to the entrance pupil diameter (F / D) varies in the range of 6≤F / D≤11.
[0136] In some embodiments, in order to verify the effect of the coupler in the embodiment of the present application, four positions can be selected within the depth of field range of the endoscope system, such as 15 mm, 20 mm, 40 mm, and 160 mm, and the endoscope system can be optimized. The imaging quality obtained by adjusting the fourth lens 104 by the motor at different positions is as follows: Figure 17(a) to Figure 20(d) shown. Figure 17(a) to Figure 17(d) Figure 17(a) is a graph showing the MTF modulation variation at different positions between 0 and 200 lp / mm. At 200 lp / mm, the MTF value is greater than 0.1. Fig.16 The MTF modulation curve of the coupler at 15mm in the depth of field is shown in Figure 17(b). Fig.16 The MTF modulation curve of the coupler at 20mm in the depth of field is shown in Figure 17(c). Fig.16 The MTF modulation curve of the coupler at 40mm within the depth of field is shown in Figure 17(d). Fig.16 The MTF modulation variation curve of the coupler at 160mm within the depth of field is shown. Figure 17(a) to Figure 17(d) The MTF curves corresponding to the meridian and sagittal planes at five different positions of the central field of view, 1mm field of view, 2mm field of view, 3mm field of view, and 4.4mm field of view at the frequency of 0-200lp / mm are given, and the MTF curve under the diffraction limit condition is given for comparison. Figure 17(a) to Figure 17(d) As we know, MTF approaches the diffraction limit. Fig.16 The spot diagram of the coupler at 15 mm in the depth of field is shown in Figure 18(b). Fig.16 The spot diagram of the coupler at 20 mm in the depth of field is shown in Figure 18(c). Fig.16 The spot diagram of the coupler at 40 mm in the depth of field is shown in Figure 18(d). Fig.16 The spot diagram of the coupler at 160 mm in the depth of field is shown in Figure 19(a). Fig.16 The field curvature distortion diagram of the coupler at 15mm in the depth of field is shown in Figure 19(b). Fig.16 The field curvature distortion diagram of the coupler at 20mm in the depth of field is shown in Figure 19(c). Fig.16 The field curvature distortion diagram of the coupler at 40mm within the depth of field is shown in Figure 19(d). Fig.16 The field curvature distortion diagram of the coupler at 160mm within the depth of field is shown. Figure 19(a) to Figure 19(d) It can be seen that the distortion is relatively small. Fig.16 The aberration analysis diagram of the coupler at 15mm in the depth of field is shown in Figure 20(b). Fig.16 The aberration analysis diagram of the coupler at 20mm in the depth of field is shown in Figure 20(c). Fig.16The aberration analysis diagram of the coupler at 40mm in the depth of field is shown in Figure 20(d). Fig.16 The aberration analysis diagram of the coupler is shown at 160mm within the depth of field.
[0137] The geometric radius of the diffuse spots of the coupler of this embodiment is all within the radius of the Airy disk, the aberration is small, the relative illumination is more than 90%, the sagittal field curvature is less than 0.026mm, the meridional field curvature is less than 0.04mm, and the relative distortion is less than 0.17%.
[0138] The field of view is described based on the real image height. The coupler of this embodiment can achieve large image field imaging within the diameter range of 0 to 8.8 mm. The ratio of the illumination at the edge of the field of view to the illumination at the center is expressed as relative illumination, and the higher this ratio is, the brighter the edge is.
[0139] In addition, the coupler can achieve an ultra-high-definition high resolution of 7.94 million pixels (3680×2160), with a relative illumination of more than 90%, and can produce clear images in a wide band of 400 to 700nm, enabling endoscopic visible light imaging.
[0140] Among them, refer to Fig.21 , the ninth lens 112 and the sixth lens 106 can be glued together. In this embodiment, the coupler includes Fig.21 The optical imaging lens group shown in the figure has an arrangement order along the optical axis direction from the aperture to the imaging surface 109 as follows: a first lens 101, an eighth lens 111, a second lens 102, a third lens 103, a fourth lens 104, a seventh lens 110, a fifth lens 105, a ninth lens 112, a sixth lens 106, a protective sheet 107 and a protective sheet 108.
[0141] The first lens 101 and the eighth lens 111 are glued together, the second lens 102 and the third lens 103 are glued together, the fourth lens 104 and the seventh lens 110 are glued together, and the ninth lens 112 and the sixth lens 106 are glued together.
[0142] In some embodiments, in order to verify the effect of the coupler in the embodiment of the present application, four positions can be selected within the depth of field range of the endoscope system, such as 15 mm, 20 mm, 40 mm, and 160 mm, and the endoscope system can be optimized. The imaging quality obtained by adjusting the fourth lens 104 by the motor at different positions is as follows: Figure 22(a) to Figure 25(d) shown. Figure 22(a) to Figure 22(d) Figure 22(a) is the MTF modulation variation curve at different positions between 0 and 200lp / mm. Fig.21 The MTF modulation variation curve of the coupler at 15mm in the depth of field is shown in Figure 22(b). Fig.21The MTF modulation variation curve of the coupler at 20mm within the depth of field is shown in Figure 22(c). Fig.21 The MTF modulation variation curve of the coupler at 40mm within the depth of field is shown in Figure 22(d). Fig.21 The MTF modulation curve of the coupler at 160mm within the depth of field is shown in Figure 23(a). Fig.21 The spot diagram of the coupler at 15 mm in the depth of field is shown in Figure 23(b). Fig.21 The spot diagram of the coupler at 20 mm in the depth of field is shown in Figure 23(c). Fig.21 The spot diagram of the coupler at 40 mm in the depth of field is shown in Figure 23(d). Fig.21 The spot diagram of the coupler at 160 mm in the depth of field is shown in Figure 24(a). Fig.21 The field curvature distortion diagram of the coupler at 15mm in the depth of field is shown in Figure 24(b). Fig.21 The field curvature distortion diagram of the coupler at 20mm in the depth of field is shown in Figure 24(c). Fig.21 The field curvature distortion diagram of the coupler at 40mm within the depth of field is shown in Figure 24(d). Fig.21 The field curvature distortion diagram of the coupler at 160mm within the depth of field is shown in Figure 25(a). Fig.21 The aberration analysis diagram of the coupler at 15mm in the depth of field is shown in Figure 25(b). Fig.21 The aberration analysis diagram of the coupler at 20mm in the depth of field is shown in Figure 25(c). Fig.21 The aberration analysis diagram of the coupler at 40mm in the depth of field is shown in Figure 25(d). Fig.21 The aberration analysis diagram of the coupler is shown at 160mm within the depth of field.
[0143] Compared to Fig.16 For the coupler shown, Fig.21 The curvature of the lens in the coupler shown does not vary significantly.
[0144] Relative to Fig.16 In terms of Fig.11 The curvature and thickness of the lenses in the coupler shown vary slightly. Fig.11 The thickness of the sixth lens 106 is increased.
[0145] Relative to Fig.16 In terms of Figure 6 The curvature and thickness of the lenses in the coupler shown vary slightly; compared to Fig.11 In terms of Figure 6 The curvature and thickness of the first lens 101 are increased.
[0146] Relative to Fig.16 In terms of Figure 1 The curvature and thickness of the lenses in the coupler shown vary slightly; compared to Figure 6 In terms of Figure 1 The thickness of the fourth lens 104, the fifth lens 105 and the sixth lens 106 in the coupler are shown to be increased.
[0147] The present application also provides an endoscope, which includes a coupler as described in any of the above embodiments.
[0148] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the above-mentioned computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).
[0149] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0150] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.
Claims
1. A coupler, characterized in that: The coupler includes an optical imaging lens group, and the arrangement order of the optical imaging lens group along the optical axis from the aperture to the imaging surface is: A first lens having a meniscus concave shape with negative power, a second lens having a meniscus concave shape with positive power, a third lens having a biconvex shape with negative power, a fourth lens having a biconvex shape with positive power, a fifth lens having a plano-concave shape with negative power, and a sixth lens having a meniscus convex shape with positive power; The fourth lens is controlled by a motor; the motor is used to change the position of the fourth lens in the direction of the optical axis.
2. The coupler according to claim 1, characterized in that The optical imaging lens assembly also includes: A seventh lens having a meniscus shape and positive optical power, the seventh lens being located between the fourth lens and the fifth lens.
3. The coupler according to claim 2, characterized in that: The seventh lens is cemented to the fourth lens.
4. The coupler according to claim 2 or 3, characterized in that: When the optical imaging lens group includes the seventh lens, the thicknesses of the fourth lens, the fifth lens and the sixth lens included in the optical imaging lens group are smaller than the thicknesses of the fourth lens, the fifth lens and the sixth lens included in the optical imaging lens group when the optical imaging lens group does not include the seventh lens.
5. The coupler according to claim 2, characterized in that: The optical imaging lens assembly also includes: An eighth lens having a meniscus shape and positive optical power, the eighth lens being located between the first lens and the second lens.
6. The coupler according to claim 5, characterized in that The eighth lens is cemented to the first lens.
7. The coupler according to claim 5 or 6, characterized in that: When the optical imaging lens group further includes the eighth lens, the thickness of the first lens included in the optical imaging lens group is less than the thickness of the first lens included in the optical imaging lens group when the optical imaging lens group does not include the eighth lens.
8. The coupler according to claim 5, characterized in that The optical imaging lens assembly also includes: A ninth lens having a meniscus shape and positive optical power, the ninth lens being located between the fifth lens and the sixth lens.
9. The coupler according to claim 8, characterized in that The ninth lens and the sixth lens are cemented and connected.
10. The coupler according to claim 8 or 9, characterized in that: When the optical imaging lens group includes the ninth lens, the thickness of the sixth lens included in the optical imaging lens group is less than the thickness of the sixth lens included in the optical imaging lens group when the optical imaging lens group does not include the ninth lens.
11. The coupler according to claim 8 or 9, characterized in that: The ratio of the focal length of the coupler to the entrance pupil diameter varies in a range greater than or equal to 6 and less than or equal to 11.
12. The coupler according to claim 1, characterized in that The second lens and the third lens are cemented and connected.
13. An endoscope, characterized in that: Comprising a coupler as claimed in any one of claims 1 to 12.