CN114675409A - 4K zooming coupler for endoscope - Google Patents
4K zooming coupler for endoscope Download PDFInfo
- Publication number
- CN114675409A CN114675409A CN202210202478.7A CN202210202478A CN114675409A CN 114675409 A CN114675409 A CN 114675409A CN 202210202478 A CN202210202478 A CN 202210202478A CN 114675409 A CN114675409 A CN 114675409A
- Authority
- CN
- China
- Prior art keywords
- lens
- cemented lens
- cemented
- positive
- zoom
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1431—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive
- G02B15/143103—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive arranged ++-
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/00163—Optical arrangements
- A61B1/00188—Optical arrangements with focusing or zooming features
- A61B1/0019—Optical arrangements with focusing or zooming features characterised by variable lenses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
- A61B1/04—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor combined with photographic or television appliances
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
- G02B23/2423—Optical details of the distal end
- G02B23/243—Objectives for endoscopes
- G02B23/2438—Zoom objectives
Abstract
The invention relates to a 4K zoom coupler for an endoscope, which comprises an optical imaging lens group between a front protection plate and a detector chip. The optical imaging lens group is sequentially provided with a first cemented lens, a second cemented lens, a third cemented lens, a first positive lens, a second positive lens and a first negative lens from the front protection plate to the detector chip along the direction of an optical axis. The third cemented lens and the first positive lens form a zoom lens group, and the second positive lens and the first negative lens form a compensation lens group; the zoom lens group and the compensation lens group are linked along the optical axis direction to realize the zooming effect. Each of the lenses of the zoom coupler has parameters adapted to provide the 4K zoom coupler with a zoom effect with a focal length from 14mm to 32mm, an entrance pupil diameter of 3.5 mm. With a 4K resolution 1/1.8 inch detector chip, the distortion is less than 2%. The coupler adopts spherical lenses, and can be better matched with a visual endoscopic system to carry out stepless zooming to realize zoom observation on an object space.
Description
Technical Field
The invention belongs to a zoom coupling optical system for an endoscope, and particularly relates to a minimally invasive medical operation, wherein a 4K zoom coupler for the endoscope is simultaneously suitable for visible and near-infrared wave bands.
Background
The zoom coupler is used for being matched with an endoscope, is a switching system between an endoscope eyepiece and an imaging chip, transmits an image detected by the endoscope to a detector, is convenient for better observation, and is commonly used in modern medical minimally invasive surgery. The coupler with both ultra-high definition imaging and zoom functions is an urgent need in various practical application scenarios.
In order to meet the above requirements, for example, chinese patent publication No. CN111929877A discloses a medical endoscope optical zoom 4K adapter, which has 9 lenses, includes one aspheric lens, has a zoom effect with a focal length from 16mm to 32mm, and uses a 4K resolution 1/2.5 inch chip, so as to be able to clearly and uniformly image. However, the device belongs to optical zooming, can only realize complete stabilization of an image plane at a plurality of specific positions, is not stepless zooming, and does not have a focusing function.
Disclosure of Invention
The invention aims to provide a 4K zoom coupler for an endoscope, which is an optical system with ultrahigh-definition imaging and stepless zooming aiming at the defects of the prior art. The coupler adopts spherical lenses, and can be better matched with a visual endoscopic system to carry out stepless zooming so as to realize variable-power observation on an object space.
The invention provides a 4K zoom coupler for an endoscope, which comprises a front protection sheet, a detector chip and an optical imaging lens group arranged between the front protection sheet and the detector chip.
The optical imaging lens group is sequentially provided with a first cemented lens, a second cemented lens, a third cemented lens, a first positive lens, a second positive lens and a first negative lens from the front protection plate to the detector chip along the direction of an optical axis. The first cemented lens and the second cemented lens form a fixed lens group; the third cemented lens and the first positive lens form a zoom lens group, and the second positive lens and the first negative lens form a compensation lens group; the fixed lens group is fixed, and the zoom lens group and the compensation lens group are linked along the optical axis direction to realize the zooming effect.
The optical imaging lens group satisfies the following conditional expressions (1), (2), (3) and (4)
0.7<La/L0<0.95 (1)
0.7<fz/f0<1.3 (2)
-0.1>fb/fg>-0.4 (3)
-0.1>fc/fg>-0.4 (4)
Wherein the content of the first and second substances,
la: the distance between the optical imaging lens group and the image plane of the third cemented lens along the optical axis direction is larger than the distance between the optical imaging lens group and the image plane of the third cemented lens along the optical axis direction;
l0: the optical imaging lens group protects the distance from the object space surface of the front protection plate to the image surface along the optical axis direction;
fz: the distance of the optical imaging lens group from the object side surface of the third cemented lens to the image side surface of the first negative lens along the optical axis direction;
f 0: an effective focal length of the optical imaging lens group;
fb is the effective focal length of the zoom lens group;
fg is the effective focal length of the fixed lens group;
fc is the effective focal length of the compensating lens group;
preferably, the first cemented lens, the second cemented lens, the third cemented lens, the first positive lens, the second positive lens, and the first negative lens satisfy the following conditions:
RC1A1<0；RC1A2>0；RC1B2>RC1B1>0；RC2A2>0；RC2B1>0；RC2B2<0；RC3A1>0；RC3A2<0；RC3B2<RC3B1<0；RZ11>0；RZ12<0；RZ22<0；RF11<0；RF12>0；
wherein the first cemented lens includes a first cemented lens a adjacent to the front protective sheet and a first cemented lens B adjacent to the second cemented lens, the second cemented lens includes a second cemented lens a adjacent to the first cemented lens and a second cemented lens B adjacent to the third cemented lens, and the third cemented lens includes a third cemented lens a adjacent to the second cemented lens and a third cemented lens B adjacent to the first positive lens.
Wherein RC1a1 is the radius of curvature of the object-side surface of the first cemented lens a; RC1a2 is the radius of curvature of the image-side surface of the first cemented lens a; RC1B2 is the radius of curvature of the image-side surface of the first cemented lens B; RC1B1 is the radius of curvature of the object side surface of the first cemented lens B; RC2a2 is the radius of curvature of the image-side surface of the second cemented lens a; RC2B1 is the radius of curvature of the object-side surface of the second cemented lens B; RC2B2 is the radius of curvature of the image-side surface of the second cemented lens B; RC3a1 is the radius of curvature of the object-side surface of the third cemented lens a; RC3a2 is the radius of curvature of the image-side surface of the third cemented lens a; RC3B1 is the radius of curvature of the object-side surface of the third cemented lens B; RC3B2 is the radius of curvature of the image-side surface of the third cemented lens B; RZ11 is the radius of curvature of the object side surface of the first positive lens; RZ12 is the radius of curvature of the image-side surface of the first positive lens; RZ22 is the radius of curvature of the image-side surface of the second positive lens; RF11 is the radius of curvature of the object side surface of the first negative lens; RF12 is the radius of curvature of the object side surface of the first negative lens;
Further, the lens types are specifically: the first cemented lens A is a biconcave lens with negative focal power; the first cemented lens B is a meniscus lens and has positive focal power; the second cemented lens A is a plano-concave lens and has negative focal power; the second cemented lens B is a biconvex lens and has positive focal power; the third cemented lens A is a biconvex lens and has positive focal power; the third cemented lens B is a meniscus lens and has negative focal power; the first positive lens is a biconvex lens; the second positive lens is a plano-convex lens; the first negative lens is a biconcave lens.
Further, the diaphragm surface of the optical imaging lens group is attached to the object side surface of the front protection sheet.
Further, the focal length of the first cemented lens is between-25 mm and-5 mm; the focal length of the second cemented lens is between 10mm and 30 mm; the focal length of the third cemented lens is between 40mm and 60 mm; the first positive lens focal length is between 10mm and 30 mm; the second positive lens focal length is between 10mm and 30 mm; the focal length of the first negative lens is between-20 mm and-5 mm.
Further, the refractive index of the first cemented lens a is between 1.60 and 1.70; the refractive index of the first cemented lens B is between 1.85 and 2.00; the refractive index of the second cemented lens A is between 1.55 and 1.70; the refractive index of the second cemented lens B is between 1.50 and 1.65; the refractive index of the third cemented lens A is between 1.50 and 1.65; the refractive index of the third cemented lens B is between 1.85 and 2.00; the refractive index of the first positive lens is between 1.50 and 1.65; the refractive index of the second positive lens is between 1.85 and 2.00; the refractive index of the first negative lens is between 1.70 and 1.80.
The beneficial effects of the invention are: the endoscope can realize the zooming effect of focal length from 14mm to 32mm by using the 4K zoom coupler, and the diameter of an entrance pupil is 3.5 mm. With a 4K resolution 1/1.8 inch detector chip, the distortion is less than 2%. The coupler adopts spherical lenses, so that the cost can be effectively controlled, and the coupler can be better matched with a visual endoscopic system to carry out stepless zooming to realize variable-power observation on an object space.
Drawings
Fig. 1 is a schematic view of the overall structure of a 4K zoom coupler for an endoscope according to the present invention;
fig. 2 is a schematic view of a fixed lens group, a zoom lens group and a compensation lens group of the 4K zoom coupler for an endoscope according to the present invention;
FIG. 3 is a graph of image spherical aberration, image field curvature and distortion for the embodiment;
FIG. 4 is an MTF curve for the embodiment;
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings, which are illustrated in the appended drawings. It should be understood that the examples are given by way of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, the present invention provides an endoscopic 4K zoom coupler, which is characterized in that: it comprises an optical imaging mirror group between the front protective sheet 10 and the detector chip 20. The optical imaging lens group is arranged in the optical axis direction from the front protective sheet 10 to the detector chip 20 and sequentially comprises a first cemented lens C10, a second cemented lens C20, a third cemented lens C30, a first positive lens Z10, a second positive lens Z20 and a first negative lens F10. The first cemented lens C10 and the second cemented lens C20 constitute a fixed lens group 100; the third cemented lens C30 and the first positive lens Z10 form a zoom lens assembly 200, and the second positive lens Z20 and the first negative lens F10 form a compensation lens assembly 300; the fixed lens group 100 is fixed, and in the dashed line of fig. 1, the zoom lens group 200 and the compensation lens group 300 are linked along the optical axis direction to achieve the zooming effect. Each of the lenses of the zoom coupler has parameters adapted to provide the 4K zoom coupler with a zoom effect with a focal length from 14mm to 32mm, an entrance pupil diameter of 3.5 mm. With a 4K resolution 1/1.8 inch detector chip, the distortion is less than 2%. The coupler adopts spherical lenses, and can be better matched with a visual endoscopic system to carry out stepless zooming to realize zoom observation on an object space.
The first cemented lens C10 includes a first cemented lens a near the front protective sheet 10 and a first cemented lens B near the second cemented lens C20, the second cemented lens C20 includes a second cemented lens a near the first cemented lens C10 and a second cemented lens B near the third cemented lens C30, and the third cemented lens C30 includes a third cemented lens a near the second cemented lens C20 and a third cemented lens B near the first positive lens Z10.
Referring to fig. 2, C1a1 is the object surface of the first cemented lens a; c1a2 is the image side surface of the first cemented lens a; C1B2 is the object side surface of the first cemented lens B; C1B1 is the image-side surface of the first cemented lens B; c2a2 is the image-side surface of the second cemented lens a; C2B1 is the object-side surface of the second cemented lens B; C2B2 is the image-side surface of the second cemented lens B; c3a1 is the object side surface of the third cemented lens a; c3a2 is the image-side surface of the third cemented lens a; C3B1 is the object-side surface of the third cemented lens B; C3B2 is the image-side surface of the third cemented lens B; z11 is the object side surface of the first positive lens Z10; z12 is the image-side surface of the first positive lens Z10; z22 is the image-side surface of the second positive lens Z20; f11 is the object side surface of the first negative lens F10; f12 is the object side surface of the first negative lens F20;
Further, the lens types are specifically: the first cemented lens A is a biconcave lens and has negative focal power; the first cemented lens B is a meniscus lens and has positive focal power; the second cemented lens A is a plano-concave lens and has negative focal power; the second cemented lens B is a biconvex lens and has positive focal power; the third cemented lens A is a biconvex lens and has positive focal power; the third cemented lens B is a meniscus lens and has negative focal power; the first positive lens Z10 is a biconvex lens; the second positive lens Z20 is a plano-convex lens; the first negative lens F10 is a biconcave lens.
Preferably, the first cemented lens, the second cemented lens, the third cemented lens, the first positive lens, the second positive lens, and the first negative lens satisfy the following conditions:
RC1A1<0；RC1A2>0；RC1B2>RC1B1>0；RC2A2>0；RC2B1>0；RC2B2<0；RC3A1>0；RC3A2<0；RC3B2<RC3B1<0；RZ11>0；RZ12<0；RZ22<0；RF11<0；RF12>0；
wherein RC1a1 is the radius of curvature of the object-side surface of the first cemented lens a; RC1a2 is the radius of curvature of the image-side surface of the first cemented lens a; RC1B2 is the radius of curvature of the image-side surface of the first cemented lens B; RC1B1 is the radius of curvature of the object side surface of the first cemented lens B; RC2a2 is the radius of curvature of the image-side surface of the second cemented lens a; RC2B1 is the radius of curvature of the object-side surface of the second cemented lens B; RC2B2 is the radius of curvature of the image-side surface of the second cemented lens B; RC3a1 is the radius of curvature of the object-side surface of the third cemented lens a; RC3a2 is the radius of curvature of the image-side surface of the third cemented lens a; RC3B1 is the radius of curvature of the object-side surface of the third cemented lens B; RC3B2 is the radius of curvature of the image-side surface of the third cemented lens B; RZ11 is the radius of curvature of the object side surface of the first positive lens; RZ12 is the radius of curvature of the image-side surface of the first positive lens; RZ22 is the radius of curvature of the image-side surface of the second positive lens; RF11 is the radius of curvature of the object side surface of the first negative lens; RF12 is the radius of curvature of the object side surface of the first negative lens;
The 4K zoom coupler for an endoscope satisfies the following conditions (1), (2), (3) and (4):
0.7<La/L0<0.95 (1)
0.7<fz/f0<1.3 (2)
-0.1>fb/fg>-0.4 (3)
-0.1>fc/fg>-0.4 (4)
wherein, the first and the second end of the pipe are connected with each other,
la: the distance from the object space surface of the third cemented lens to the image surface of the optical imaging lens group along the optical axis direction;
l0: the optical imaging lens group protects the distance from the object space surface of the front protection plate to the image surface along the optical axis direction;
fz: the distance of the optical imaging lens group from the object side surface of the third cemented lens to the image side surface of the first negative lens along the optical axis direction;
f 0: an effective focal length of the optical imaging lens group;
fb is the effective focal length of the zoom lens group;
fg is the effective focal length of the fixed lens group;
fc is the effective focal length of the compensating lens group;
taking a 1/1.8 inch detector chip and a coupler coaxially arranged as an example, a specific embodiment of the endoscopic 4K zoom coupler of the present invention is given as follows:
the optical path structure of this embodiment is as shown in fig. 1. Specific lens data of each lens are shown in table 1, zoom data are shown in table 2, and aberrations are shown in fig. 3 to 4.
TABLE 1
TABLE 2
| Focal length/mm | 14 | 24 | 32 |
| D9/mm | 16.888 | 9.425 | 2.498 |
| D14/mm | 9.725 | 3.285 | 2.103 |
| D18/mm | 4.057 | 17.960 | 26.069 |
The endoscopic 4K zoom coupler provided by the embodiment can finally realize the zoom effect of the focal length from 14mm to 32mm, the entrance pupil diameter is 3.5mm, a 4K resolution 1/1.8 inch detector chip is used, and the distortion is less than 2%.
Fig. 3 is a diagram showing aberration diagrams of spherical aberration, astigmatism, and distortion of the endoscopic 4K zoom coupler optical imaging lens assembly according to the embodiment in order from the left. In the spherical aberration graph, a spherical aberration curve is shown by a solid line. In the astigmatism graphs, aberrations in the tangential plane are shown by solid lines, and aberrations in the sagittal plane are shown by broken lines. In the distortion graph, distortion aberration of the system is shown by a solid line.
FIG. 4 is a graph of MTF curves corresponding to the central field, 0.15mm (0.5 field), 0.2mm (0.707 field), and 0.3mm (peripheral field) at frequencies of 0-150cy/mm for the central field and the sagittal plane at four different positions, and comparing the MTF curves at the diffraction limit. The MTF curve for each field at 250lp/mm is greater than 0.1. 3840 × 2160 pixels of a 1/1.8 inch chip are 2 μm, corresponding to a nyquist frequency of 250lp/mm, and an MTF value >0.1 under the line pair meets the resolution requirement of the chip.
Table 3 shows conditional expressions (1), (3), and (4) for implementing an endoscopic 4K zoom coupler optical imaging lens assembly, and their respective parameter values. Table 4 shows conditional expression (2) and the corresponding parameter values related thereto. The values shown in tables 3 and 4 are 586nm as the design dominant wavelength.
TABLE 3
TABLE 4
| Number of | Parameter(s) | Value 1 | Number 2 | Number 3 |
| 1 | fz | 15.621 | 22.455 | 25.824 |
| 2 | f0 | 14 | 24 | 32 |
| 3 | fz/f0 | 1.116 | 0.936 | 0.807 |
The present invention has been described above by way of the embodiments and examples, but the present invention is not limited to the embodiments and examples described above, and various modifications are possible. For example, the curvature radius, thickness, surface interval, refractive index, and abbe number of each lens are not limited to those shown in the above-described embodiments, and may be other values. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A4K zoom coupler for an endoscope is characterized by comprising a front protection sheet, a detector chip and an optical imaging lens group arranged between the front protection sheet and the detector chip;
the optical imaging lens group is composed of a first cemented lens, a second cemented lens, a third cemented lens, a first positive lens, a second positive lens and a first negative lens which are arranged in sequence along the optical axis direction from the front protective sheet to the detector chip; the first cemented lens and the second cemented lens form a fixed lens group; the third cemented lens and the first positive lens form a zoom lens group, and the second positive lens and the first negative lens form a compensation lens group; the fixed lens group is fixed, and the zoom lens group and the compensation lens group are linked along the optical axis direction to realize the zooming effect;
The optical imaging lens group satisfies the following conditional expressions (1) (2)
0.7<La/L0<0.95(1)
0.7<fz/f0<1.3(2)
Wherein, the first and the second end of the pipe are connected with each other,
la: the distance between the optical imaging lens group and the image plane of the third cemented lens along the optical axis direction is larger than the distance between the optical imaging lens group and the image plane of the third cemented lens along the optical axis direction;
l0: the optical imaging lens group protects the distance from the object space surface of the front protection plate to the image surface along the optical axis direction;
fz: the distance of the optical imaging lens group from the object side surface of the third cemented lens to the image side surface of the first negative lens along the optical axis direction; f 0: an effective focal length of the optical imaging lens group;
the 4K zoom coupler can achieve a stepless zoom effect with a focal length from 14mm to 32 mm.
2. The 4K zoom coupler for an endoscope according to claim 1, wherein the optical imaging lens group satisfies the following conditional expression
-0.1>fb/fg>-0.4(3)
Wherein the content of the first and second substances,
fb is the effective focal length of the zoom lens group;
fg is the effective focal length of the fixed lens group.
3. The 4K zoom coupler for an endoscope according to claim 2, wherein the optical imaging lens group satisfies the following conditional expression
-0.1>fc/fg>-0.4(4)
Wherein the content of the first and second substances,
fc is the effective focal length of the compensation set.
4. The 4K zoom coupler for an endoscope according to claim 1, wherein: the optical imaging lens group further comprises a diaphragm surface, and the diaphragm surface is attached to the object space surface of the front protection sheet.
5. The 4K zoom coupler for an endoscope according to claim 1, wherein: the focal length of the first cemented lens is between-25 mm and-5 mm; the focal length of the second cemented lens is between 10mm and 30 mm; the focal length of the third cemented lens is between 40mm and 60 mm; the first positive lens focal length is between 10mm and 30 mm; the second positive lens focal length is between 10mm and 30 mm; the focal length of the first negative lens is between-20 mm and-5 mm.
6. The 4K zoom coupler for an endoscope according to claim 1, wherein the first, second, third, first positive, second positive, and first negative lenses satisfy the following conditions:
RC1A1<0；RC1A2>0；RC1B2>RC1B1>0；RC2A2>0；RC2B1>0；RC2B2<0；RC3A1>0；RC3A2<0；RC3B2<RC3B1<0；RZ11>0；RZ12<0；RZ22<0；RF11<0；RF12>0；
wherein the first cemented lens includes a first cemented lens a adjacent to the front protective sheet and a first cemented lens B adjacent to the second cemented lens, the second cemented lens includes a second cemented lens a adjacent to the first cemented lens and a second cemented lens B adjacent to the third cemented lens, and the third cemented lens includes a third cemented lens a adjacent to the second cemented lens and a third cemented lens B adjacent to the first positive lens;
wherein RC1a1 is the radius of curvature of the object-side surface of the first cemented lens a; RC1a2 is the radius of curvature of the image-side surface of the first cemented lens a; RC1B2 is the radius of curvature of the image-side surface of the first cemented lens B; RC1B1 is the radius of curvature of the object side surface of the first cemented lens B; RC2a2 is the radius of curvature of the image-side surface of the second cemented lens a; RC2B1 is the radius of curvature of the object-side surface of the second cemented lens B; RC2B2 is the radius of curvature of the image-side surface of the second cemented lens B; RC3a1 is the radius of curvature of the object-side surface of the third cemented lens a; RC3a2 is the radius of curvature of the image-side surface of the third cemented lens a; RC3B1 is the radius of curvature of the object-side surface of the third cemented lens B; RC3B2 is the radius of curvature of the image-side surface of the third cemented lens B; RZ11 is the radius of curvature of the object side surface of the first positive lens; RZ12 is the radius of curvature of the image-side surface of the first positive lens; RZ22 is the radius of curvature of the image-side surface of the second positive lens; RF11 is the radius of curvature of the object side surface of the first negative lens; RF12 is the radius of curvature of the object side surface of the first negative lens.
7. The endoscopic 4K zoom coupler of claim 6, wherein the lens type is specifically: the first cemented lens A is a biconcave lens with negative focal power; the first cemented lens B is a meniscus lens and has positive focal power; the second cemented lens A is a plano-concave lens and has negative focal power; the second cemented lens B is a biconvex lens and has positive focal power; the third cemented lens A is a biconvex lens and has positive focal power; the third cemented lens B is a meniscus lens and has negative focal power; the first positive lens is a biconvex lens; the second positive lens is a plano-convex lens; the first negative lens is a biconcave lens.
8. The 4K zoom coupler for an endoscope according to claim 6, a refractive index of the first cemented lens a being between 1.60 and 1.70; the refractive index of the first cemented lens B is between 1.85 and 2.00; the refractive index of the second cemented lens A is between 1.55 and 1.70; the refractive index of the second cemented lens B is between 1.50 and 1.65; the refractive index of the third cemented lens A is between 1.50 and 1.65; the refractive index of the third cemented lens B is between 1.85 and 2.00; the refractive index of the first positive lens is between 1.50 and 1.65; the refractive index of the second positive lens is between 1.85 and 2.00; the refractive index of the first negative lens is between 1.70 and 1.80.
9. The 4K zoom coupler of claim 1, wherein the coupler is capable of coupling to a visual endoscope and imaging a scene perceived by an object of the endoscope on a detector chip within the coupler, the zoom coupler being capable of infinitely variable zooming and variable magnification viewing of the object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210202478.7A CN114675409B (en) | 2022-03-03 | 2022-03-03 | 4K zooming coupler for endoscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210202478.7A CN114675409B (en) | 2022-03-03 | 2022-03-03 | 4K zooming coupler for endoscope |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114675409A true CN114675409A (en) | 2022-06-28 |
| CN114675409B CN114675409B (en) | 2023-02-03 |
Family
ID=82071759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210202478.7A Active CN114675409B (en) | 2022-03-03 | 2022-03-03 | 4K zooming coupler for endoscope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114675409B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115327763A (en) * | 2022-08-31 | 2022-11-11 | 重庆西山科技股份有限公司 | Zoom optical adapter and 4K endoscope |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000338400A (en) * | 1999-05-31 | 2000-12-08 | Asahi Optical Co Ltd | Zoom lens |
| US20040169934A1 (en) * | 2003-02-28 | 2004-09-02 | Makoto Oomura | Large zoom ratio, four-group zoom lens |
| CN102736240A (en) * | 2011-04-08 | 2012-10-17 | 富士胶片株式会社 | Camera module for endoscope |
| US20160306162A1 (en) * | 2014-08-28 | 2016-10-20 | Olympus Corporation | Endoscope objective optical system |
| CN111880302A (en) * | 2020-06-28 | 2020-11-03 | 浙江大学 | Medical endoscopic optical zoom lens with high magnification and wide angle |
| CN111929877A (en) * | 2020-09-09 | 2020-11-13 | 杭州有人光电技术有限公司 | Optical zoom 4K adapter of medical endoscope |
| CN112099212A (en) * | 2020-10-12 | 2020-12-18 | 淄博海泰新光光学技术有限公司 | Endoscope adapter optical system of internal focusing |
| CN213122420U (en) * | 2020-10-30 | 2021-05-04 | 重庆西山科技股份有限公司 | Endoscope adaptive lens |
| CN213122422U (en) * | 2020-10-30 | 2021-05-04 | 重庆西山科技股份有限公司 | Endoscope adaptive lens |
| CN112826421A (en) * | 2020-12-02 | 2021-05-25 | 长春理工大学 | Three-wafer fluorescence dual-band endoscope zooming adapter |
-
2022
- 2022-03-03 CN CN202210202478.7A patent/CN114675409B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000338400A (en) * | 1999-05-31 | 2000-12-08 | Asahi Optical Co Ltd | Zoom lens |
| US20040169934A1 (en) * | 2003-02-28 | 2004-09-02 | Makoto Oomura | Large zoom ratio, four-group zoom lens |
| CN102736240A (en) * | 2011-04-08 | 2012-10-17 | 富士胶片株式会社 | Camera module for endoscope |
| US20160306162A1 (en) * | 2014-08-28 | 2016-10-20 | Olympus Corporation | Endoscope objective optical system |
| CN111880302A (en) * | 2020-06-28 | 2020-11-03 | 浙江大学 | Medical endoscopic optical zoom lens with high magnification and wide angle |
| CN111929877A (en) * | 2020-09-09 | 2020-11-13 | 杭州有人光电技术有限公司 | Optical zoom 4K adapter of medical endoscope |
| CN112099212A (en) * | 2020-10-12 | 2020-12-18 | 淄博海泰新光光学技术有限公司 | Endoscope adapter optical system of internal focusing |
| CN213122420U (en) * | 2020-10-30 | 2021-05-04 | 重庆西山科技股份有限公司 | Endoscope adaptive lens |
| CN213122422U (en) * | 2020-10-30 | 2021-05-04 | 重庆西山科技股份有限公司 | Endoscope adaptive lens |
| CN112826421A (en) * | 2020-12-02 | 2021-05-25 | 长春理工大学 | Three-wafer fluorescence dual-band endoscope zooming adapter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115327763A (en) * | 2022-08-31 | 2022-11-11 | 重庆西山科技股份有限公司 | Zoom optical adapter and 4K endoscope |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114675409B (en) | 2023-02-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7085064B2 (en) | Object lens and endoscope using it | |
| US9645383B2 (en) | Objective lens for endoscope and endoscope | |
| US7773318B2 (en) | Objective optical system for endoscopes | |
| JP2697822B2 (en) | Endoscope objective lens | |
| US9405095B2 (en) | Imaging lens and imaging apparatus | |
| CN105074531B (en) | Amplify endoscope optical system | |
| CN109416459B (en) | Endoscope objective optical system | |
| US8824067B2 (en) | Endoscope objective optical system | |
| JP4895169B2 (en) | Infrared optics | |
| JP6563130B2 (en) | Imaging optical system and imaging apparatus | |
| US11903560B2 (en) | Objective optical system, image pickup apparatus, endoscope and endoscope system | |
| US11194136B2 (en) | Optical system for image pickup and image pickup apparatus | |
| CN114675409B (en) | 4K zooming coupler for endoscope | |
| CN113589477B (en) | Near-infrared band and visible light confocal lens and magnifying lens group | |
| JP3758801B2 (en) | Endoscope objective lens system | |
| CN107874733B (en) | Small-caliber endoscope optical system | |
| JP4634578B2 (en) | Endoscope objective variable magnification optical system | |
| US11480762B2 (en) | Short-wavelength infrared imaging lens and imaging device including two lens groups of −+ refractive powers having seven lenses of −++−−++ refractive powers or eight lenses of −+++−−++ refractive powers | |
| EP3514597A1 (en) | Optical system for image capturing and image capturing device | |
| KR101725982B1 (en) | Imaging Lens System for Endoscope | |
| CN110251049A (en) | Endoscope lens | |
| US8503113B2 (en) | Wide-angle relay lens and imaging system having same | |
| CN219842588U (en) | Wide-angle large-aperture fixed-focus monitoring lens | |
| CN113721361B (en) | Optical imaging system for stereoscopic endoscope and stereoscopic endoscope | |
| CN219516193U (en) | Wide-angle lens, imaging system and endoscope |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |