CN106842547B - Imaging objective optical system for endoscope - Google Patents
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- G—PHYSICS
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- 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
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- G02B23/2423—Optical details of the distal end
- G02B23/243—Objectives for endoscopes
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- G02B13/00—Optical objectives specially designed for the purposes specified below
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- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
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Abstract
The invention discloses an endoscopic photographing objective optical system, which sequentially comprises a first lens group, a diaphragm and a second lens group from an object side to an image side, wherein the first lens group has positive focal power, the first lens group consists of a first lens and a second lens, the second lens group consists of a third lens with positive focal power, and the first lens, the second lens and the third lens are made of plastic materials and meet the following conditional expressions: f/H (L1 r 1) <4; h (L1 r 1)/IMH <0.5; where f is the focal length of the imaging objective optical system for endoscopic use, H (L1 r 1) is the height corresponding to the object-side surface of the first lens group through which the principal ray corresponding to the maximum image height passes in normal observation, and IMH is the maximum image height on the corresponding chip photosurface in normal observation. The imaging objective optical system for the endoscope has the characteristics of small diameter, wide view field, good aberration correction and low cost.
Description
Technical Field
The present invention relates to an objective optical system, and more particularly, to an imaging objective optical system for endoscopic use.
Background
The endoscope is a medical optical instrument which is sent into the body from the outside through the natural cavity of the human body to check the internal diseases, can directly observe the pathological changes of the internal cavity of the viscera, determine the position and the range of the pathological changes, can take pictures, carry out biopsy or brush sheets, greatly improves the diagnosis accuracy of cancers and can carry out certain minimally invasive surgery treatment.
In order to reduce the pain of the patient to a greater extent, shorten the time for postoperative rehabilitation, reduce the work of doctors, and improve the diagnosis level of visual and scientific datamation judgment, it is necessary to further reduce the endoscope imaging system and improve the imaging effect, so that research and use of an objective optical system for endoscopic imaging with a larger imaging field of view and smaller and clearer becomes a technical problem.
In order to achieve miniaturization and good optical performance, an endoscope objective system composed of a first lens having negative optical power, a stop, a second lens having positive optical power, and a third lens group in order from the object side is described in chinese patent document CN 204101801U. The first lens and the third lens which have weak focal power and mainly have the function of correcting aberration are used for realizing the structure of the second lens which has strong focal power and is used for realizing imaging, so that the three-lens structure which can achieve miniaturization is realized, and good imaging performance can be realized. However, the first lens adopts a glass molding aspheric surface, the manufacturing cost is very high, and compared with a plastic lens produced by high-speed injection molding, the production efficiency of the glass molding aspheric surface is low, so that the glass molding aspheric surface is not beneficial to mass production.
Disclosure of Invention
The invention aims to provide an endoscopic photographing objective optical system, which has the characteristics of small diameter, wide view field and low cost.
The invention discloses an endoscopic photographing objective optical system, which adopts the following technical scheme:
the utility model provides an endoscopic objective optical system that makes a video recording, includes first lens group, diaphragm and second lens group in proper order from object side to image side, first lens group has positive focal power, first lens group comprises first lens and second lens, the second lens group comprises a third lens group that has positive focal power, first lens, second lens and third lens are made by plastic materials to satisfy following conditional expression:
f/H(L1r1)<4；
H(L1r1)/IMH<0.5；
where f is the focal length of the imaging objective optical system for endoscopic use, H (L1 r 1) is the height corresponding to the object-side surface of the first lens group through which the principal ray corresponding to the maximum image height passes in normal observation, and IMH is the maximum image height on the corresponding chip photosurface in normal observation.
Preferably, the first lens group satisfies the following conditional expression:
0.4<f/f_G1<1.0；
wherein f_g1 is a focal length of the first lens group.
Preferably, the first lens group is composed of a first lens having negative optical power and a second lens having positive optical power, and satisfies the following conditional expression:
-2.0<f/f1<-0.3；
1.0<f/f2<1.8；
wherein f1 is the focal length of the first lens, and f2 is the focal length of the second lens.
Preferably, the third lens satisfies the following conditional expression:
f/f3<0.4；
wherein f3 is the focal length of the third lens.
Preferably, the first lens and the second lens further satisfy the following conditional expression:
|1/(f1*V1)+1/(f2*V2)+1/(f3*V3)|<0.02；
wherein V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, and V3 is the Abbe number of the third lens.
Preferably, the endoscopic imaging objective optical system further satisfies the following conditional expression:
TTL/f<3.2；
BF/f>1.4；
wherein TTL is the distance from the object side surface of the first lens to the chip on the optical axis, and BF is the distance from the image side surface of the third lens to the chip on the optical axis.
Preferably, at least one surface of the first lens is aspheric, and at least one surface of the second lens is aspheric.
Preferably, the third lens has an aspherical surface on at least one surface.
Preferably, the image side surface of the first lens and the object side surface of the second lens are glued together by glue.
The imaging objective optical system for the endoscope has the beneficial effects that: the focal length of the objective optical system is limited by a condition f/H (L1 r 1) <4, the wide angle is better realized, the ratio of the height H (L1 r 1) corresponding to the surface of the object side of the first lens group, which is the main ray corresponding to the maximum image height in normal observation, to the maximum image height IMH on the chip light sensitive surface corresponding to normal observation is limited by the condition H (L1 r 1)/IMH <0.5, the image surface bending is optimized and the out-of-axis phase difference is restrained on the premise of realizing the small caliber, and the first lens group with positive focal power is formed by the first lens and the second lens, and the second lens group is formed by the third lens group with positive focal power.
Drawings
FIG. 1 is a schematic view of an embodiment of an endoscopic objective optical system according to the present invention;
FIG. 2 is a schematic view of aberration curves of a first embodiment of an endoscopic objective optical system according to the present invention;
FIG. 3 is a schematic view of a second embodiment of an endoscopic objective optical system according to the present invention;
fig. 4 is a schematic aberration diagram of a second embodiment of an endoscopic objective optical system according to the present invention.
FIG. 5 is a schematic view of a third embodiment of an endoscopic objective optical system according to the present invention;
fig. 6 is a schematic aberration diagram of a third embodiment of an endoscopic objective optical system according to the present invention.
Detailed Description
The invention is further illustrated and described below in conjunction with the specific embodiments and the accompanying drawings:
an optical system of an imaging objective lens for endoscope comprises a first lens group with negative focal power, a diaphragm, a second lens group with positive focal power, an optical filter, plate glass and a chip photosurface in sequence from an object side to an image side. The optical filter is mainly used for cutting off specific wavelength, and the plate glass is mainly used for protecting the photosurface of the chip.
The first lens group is composed of a first lens with negative focal power and a second lens with positive focal power, wherein the image side surface of the first lens group is concave, and compared with a single lens, the first lens group is favorable for correcting edge aberration, and the second lens group is composed of a third lens with positive focal power.
By setting the following conditional expressions (1) and (2), the reduction in diameter and the wide angle of the imaging objective optical system for endoscopic use are successfully achieved.
f/H(L1r1)<4； (1)
H(L1r1)/IMH<0.5； (2)
The condition (1) defines the focal length of the endoscope objective optical system, and if the focal length of the endoscope objective optical system is too long, the optical focal length is too weak, the focusing ability is insufficient, and the wide angle is difficult to realize.
The condition (2) defines an optical effective aperture of the first lens of the endoscopic objective optical system. It is generally known that the size of the imaging chip largely determines the diameter of the endoscope, and in order to continuously realize a small aperture, the size of the lens aperture is determined by the height H (L1 r 1) corresponding to the principal ray corresponding to the maximum image height through the object-side surface of the first lens group, that is, the physical aperture of the imaging objective optical system for endoscope is determined, and the aperture of the imaging objective optical system for endoscope can be reduced by the fact that H (L1 r 1)/IMH is smaller than a certain value.
Further, the endoscope imaging objective optical system satisfies the following conditional expression:
0.4<f/f_G1<1.0； (3)
by reasonably configuring the weak focal power of the first lens group, the optical system can fully turn off-axis light rays without bringing additional aberration, particularly field curvature aberration of off-axis view field, and if the focal power of the first lens group is too strong, the burden of aberration correction of the second lens group can be increased, so that the optical system of the endoscopic image pickup objective lens is more complex.
Further, it is preferable that the first lens group of the endoscopic image pickup objective optical system is constituted by a first lens having negative optical power and a second lens having positive optical power, and the first lens and the second lens satisfy the following conditional expression:
-2.0<f/f1<-0.3； (4)
1.0<f/f2<1.8； (5)
the focal power distribution of the first lens group is reasonably configured, so that the first lens group can better compress the light rays with large view fields and simultaneously effectively focus the light rays. If f/f1 exceeds the upper limit of the condition (4), the negative optical focal length of the first lens is too weak to effectively turn the light of the off-axis field; if f/f1 is lower than the lower limit of the condition (4), the negative focal power of the first lens group is too strong, and the aberration correction difficulty of the off-axis visual field is increased.
If f/f2 exceeds the upper limit of the condition (5), the positive power of the second lens group is too strong, and correction of system spherical aberration and correction of off-axis aberration, particularly curvature of field, are emphasized; if f/f1 is lower than the lower limit of the condition (5), the optical focal length of the second lens is too weak to effectively focus the light, increasing the structural length of the system.
Conditional expression (4) defines the refractive index of the first lens.
Further, the second lens group is constituted by a third lens, and the third lens satisfies the following conditional expression:
f/f3<0.4； (6)
the main function of the second lens group to configure the third lens having positive weak power is to correct aberrations. If f/f3 exceeds the upper limit of the condition (6), the optical power is too strong to correct on-axis spherical aberration and off-axis aberration.
In order to obtain a high-performance imaging objective optical system for endoscopic use, the following conditional expression is satisfied:
|1/(f1*V1)+1/(f2*V2)+1/(f3*V3)|<0.02； (7)
in order to miniaturize the imaging objective optical system for endoscopic use, the following conditional expression is also required to be satisfied:
TTL/f<3.2； (8)
BF/f>1.4； (9)
in order to achieve a small diameter, a wide angle, and high performance, the first lens has at least 1 surface that is aspherical, the second lens has at least 1 surface that is aspherical, and the third lens has at least 1 surface that is aspherical, and preferably the first lens, the second lens, and the third lens each have 2 surfaces that are aspherical. By providing the aspherical surface, aberration correction is facilitated. In the case where the first lens, the second lens, and the third lens are aspherical, plastic injection molding lenses are preferably used, which is high in mass productivity and low in cost.
The technical idea that the above-described endoscope objective optical system can achieve a small diameter, a wide angle, and a high-definition optical performance is as described above, however, specifically, an endoscope objective optical system in which the maximum lens among lenses of the whole system is 2.0mm or less in outer diameter, and preferably 1.0mm or less can be achieved.
In order to achieve a small diameter, a wide angle, and a high definition optical performance of millions or more, the following aspherical formula is used in the present embodiment:
wherein Z represents the sagittal height of the aspheric surface along the optical axis direction, y represents the distance of the aspheric surface along the direction perpendicular to the optical axis, c represents the central curvature, which is the inverse of the radius, k represents the conic coefficient or quadratic constant, and A4-A16 represent the aspheric coefficients 4-16 times, respectively
The above-mentioned coincidences are respectively described as follows:
f, the focal length of an endoscopic photographing objective optical system; f1, focal length of the first lens; f2, the focal length of the second lens; f3, the focal length of the third lens; h (L1 r 1) is the height at which the principal ray corresponding to the maximum image height passes through the object-side surface of the first lens in normal observation; IMH, the maximum image height on the corresponding chip photosurface during routine observation; v1, abbe number of the first lens; v2 Abbe number of the second lens; v3 Abbe number of the third lens; BF, the distance between the image side surface of the third lens and the chip on the optical axis; TTL is the distance between the object side surface of the first lens and the chip on the optical axis.
Example 1
Referring to fig. 1, an objective lens optical system for endoscopic imaging includes, in order from an object side to an image side, a first lens group 10 having negative optical power, a stop 30, a second lens group 20 having positive optical power, an optical filter 40, a plate glass 50, and a chip photosurface 60. The filter 40 is mainly used for cutting off a specific wavelength, and the plate glass 50 mainly protects a photosurface 60 of the chip.
The first lens group 10 is composed of a first lens 11 with negative focal power and a second lens 12 with positive focal power, the object side surface and the image side surface of the first lens 11 are both concave surfaces, the object side surface of the first lens 11 is a spherical surface, the image side surface of the first lens 11 is an aspherical surface, the object side surface and the image side surface of the second lens are both convex surfaces and are aspherical surfaces, the diaphragm 30 is arranged on the image side surface of the second lens 12, the second lens group 20 is composed of a third lens 21 with positive focal power, the object side surface of the third lens 21 is an aspherical surface with curvature inflection point, and the image side surface thereof is a convex surface and is an aspherical surface. The imaging objective optical system for endoscopic use in the embodiment achieves an image height of 1.05mm, a full field angle of greater than 100 degrees and a caliber of less than 1.2mm. The following table shows data of an optical system of an endoscopic objective lens according to the present embodiment, and various aberration diagrams of the present embodiment are shown in fig. 2.
Aspheric coefficient
In the above table, the 2 nd plane is the object side surface of the first lens, the 3 rd plane is the image side surface of the first lens, the 4 th plane is the object side surface of the second lens, the 5 th plane is the image side surface of the second lens, the 6 th plane is the object side surface of the third lens, the 7 th plane is the image side surface of the third lens, the 8 th plane is the object side surface of the optical filter, the 9 th plane is the image side surface of the optical filter, the 10 th plane is the object side surface of the plate glass, and the 11 th plane is the image side surface of the plate glass.
Example two
Referring to fig. 3, an objective lens optical system for endoscopic imaging includes, in order from an object side to an image side, a first lens group 10 having negative optical power, a stop 30, a second lens group 20 having positive optical power, an optical filter 40, a plate glass 50, and a chip photosurface 60. The filter 40 is mainly used for cutting off a specific wavelength, and the plate glass 50 mainly protects a photosurface 60 of the chip.
The first lens group 10 is composed of a first lens 11 with negative focal power and a second lens 12 with positive focal power, the object side surface and the image side surface of the first lens 11 are both concave surfaces, the object side surface and the image side surface of the first lens 11 are both aspheric surfaces, the object side surface and the image side surface of the second lens are both convex surfaces and are aspheric surfaces, the diaphragm 30 is arranged on the image side surface of the second lens 12, the second lens group 20 is composed of a third lens 21 with positive focal power, the object side surface of the third lens 21 is aspheric surface with curvature inflection point, and the image side surface is convex surface and is aspheric surface. The imaging objective optical system for endoscopic use in the embodiment achieves an image height of 1.02mm, a full field angle of greater than 100 degrees and a caliber of less than 1.5mm. The following table shows data of an optical system of an endoscopic objective lens according to the present embodiment, and various aberration diagrams of the present embodiment are shown in fig. 4.
Aspheric parameters
In the above table, the 2 nd plane is the object side surface of the first lens, the 3 rd plane is the image side surface of the first lens, the 4 th plane is the object side surface of the second lens, the 5 th plane is the image side surface of the second lens, the 6 th plane is the object side surface of the third lens, the 7 th plane is the image side surface of the third lens, the 8 th plane is the object side surface of the optical filter, the 9 th plane is the image side surface of the optical filter, the 10 th plane is the object side surface of the plate glass, and the 11 th plane is the image side surface of the plate glass.
Example III
Referring to fig. 5, an objective lens optical system for endoscopic imaging includes, in order from an object side to an image side, a first lens group 10 having negative optical power, a stop 30, a second lens group 20 having positive optical power, an optical filter 40, a plate glass 50, and a chip photosurface 60. The filter 40 is mainly used for cutting off a specific wavelength, and the plate glass 50 mainly protects a photosurface 60 of the chip.
The first lens group 10 is formed by gluing a first lens 11 with negative focal power and a second lens 12 with positive focal power, the object side surface of the first lens 11 is concave, the image side surface is convex and is aspheric, the object side surface and the image side surface of the second lens are convex and are aspheric, the image side surface of the first lens 11 and the object side surface of the second lens 12 are glued together through glue, the chromatic aberration correction effect is improved, the diaphragm 30 is arranged on the image side surface of the second lens 12, the second lens group 20 is formed by a third lens 21 with positive focal power, the object side surface of the third lens 21 is concave and aspheric, and the image side surface of the third lens 21 is convex and aspheric. The imaging objective optical system for endoscopic use in the embodiment achieves an image height of 1.07mm, a full field angle of more than 108 degrees and a caliber of less than 1.5mm. The following table shows data of an optical system of an endoscopic objective lens according to the present embodiment, and various aberration diagrams of the present embodiment are shown in fig. 6.
Aspheric parameters
In the above table, the 2 nd plane is the object side surface of the first lens, the 3 rd plane is the image side surface of the first lens, the 4 th plane is the object side surface of the second lens, the 5 th plane is the image side surface of the second lens, the 6 th plane is the object side surface of the third lens, the 7 th plane is the image side surface of the third lens, the 8 th plane is the object side surface of the optical filter, the 9 th plane is the image side surface of the optical filter, the 10 th plane is the object side surface of the plate glass, and the 11 th plane is the image side surface of the plate glass.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (8)
1. The imaging objective optical system for endoscopic use comprises a first lens group, a diaphragm and a second lens group in sequence from an object side to an image side, and is characterized in that the first lens group has positive focal power, the first lens group comprises a first lens and a second lens, the second lens group comprises a third lens group with positive focal power, and the first lens, the second lens and the third lens are made of plastic materials and satisfy the following conditional expressions:
f/H(L1r1)<4；
H(L1r1)/IMH<0.5；
wherein f is the focal length of the imaging objective optical system for endoscopic use, H (L1 r 1) is the height corresponding to the object-side surface of the first lens group through which the principal ray corresponding to the maximum image height passes during normal observation, and IMH is the maximum image height on the corresponding chip photosurface during normal observation;
the first lens group is composed of a first lens having negative optical power and a second lens having positive optical power, and satisfies the following conditional expression:
-2.0<f/f1<-0.3；
1.0<f/f2<1.8；
wherein f1 is the focal length of the first lens, and f2 is the focal length of the second lens.
2. The endoscopic objective optical system according to claim 1, wherein said first lens group satisfies the following conditional expression:
0.4<f/f_G1<1.0；
wherein f_g1 is a focal length of the first lens group.
3. The endoscopic objective optical system according to claim 2, wherein said third lens satisfies the following conditional expression:
f/f3<0.4；
wherein f3 is the focal length of the third lens.
4. The endoscopic objective optical system according to any one of claims 1 to 3, wherein said first lens and said second lens further satisfy the following conditional expression:
|1/(f1*V1)+1/(f2*V2)+ 1/(f3*V3)|<0.02；
wherein V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, and V3 is the Abbe number of the third lens.
5. The endoscopic objective optical system according to claim 4, wherein the following conditional expression is also satisfied:
TTL/f<3.2；
BF/f>1.4；
wherein TTL is the distance from the object side surface of the first lens to the chip on the optical axis, and BF is the distance from the image side surface of the third lens to the chip on the optical axis.
6. The endoscopic objective optical system according to any one of claims 1 to 3, wherein at least one surface of said first lens is aspherical, and at least one surface of said second lens is aspherical.
7. The endoscopic objective optical system according to claim 6, wherein said third lens has an aspherical surface on at least one surface.
8. The endoscopic objective optical system according to any one of claims 1 to 3, wherein an image side surface of said first lens element and an object side surface of said second lens element are glued together by glue.
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| CN107874733B (en) * | 2017-12-04 | 2024-03-22 | 中山市众盈光学有限公司 | Small-caliber endoscope optical system |
| WO2022021417A1 (en) * | 2020-07-31 | 2022-02-03 | 深圳市大疆创新科技有限公司 | Optical system, photographing device and movable platform |
| CN114280762B (en) * | 2022-03-04 | 2022-05-27 | 精微致远医疗科技(武汉)有限公司 | Be applied to miniature camera lens of pancreaticobiliary duct's miniature probe |
| CN117130166B (en) * | 2023-10-26 | 2024-03-15 | 江西联昊光电有限公司 | Optical system and near-eye display device |
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| JP2015045837A (en) * | 2013-07-31 | 2015-03-12 | パナソニックＩｐマネジメント株式会社 | Endoscope lens unit and endoscope having the same |
| JP5972441B1 (en) * | 2015-08-31 | 2016-08-17 | パナソニック株式会社 | Endoscope |
| CN206321868U (en) * | 2017-02-24 | 2017-07-11 | 东莞市宇光光电科技有限公司 | Camera Objective Optical System for Endoscopy |
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| JP2000019390A (en) * | 1999-04-27 | 2000-01-21 | Olympus Optical Co Ltd | Objective lens |
| JP2015045837A (en) * | 2013-07-31 | 2015-03-12 | パナソニックＩｐマネジメント株式会社 | Endoscope lens unit and endoscope having the same |
| CN204101801U (en) * | 2013-09-18 | 2015-01-14 | 富士胶片株式会社 | Objective lens for endoscope and introscope |
| JP5972441B1 (en) * | 2015-08-31 | 2016-08-17 | パナソニック株式会社 | Endoscope |
| CN206321868U (en) * | 2017-02-24 | 2017-07-11 | 东莞市宇光光电科技有限公司 | Camera Objective Optical System for Endoscopy |
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| CN106842547A (en) | 2017-06-13 |
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