CN108968891B - Endoscope objective optical system - Google Patents
Endoscope objective optical system Download PDFInfo
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- CN108968891B CN108968891B CN201810521217.5A CN201810521217A CN108968891B CN 108968891 B CN108968891 B CN 108968891B CN 201810521217 A CN201810521217 A CN 201810521217A CN 108968891 B CN108968891 B CN 108968891B
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- endoscope objective
- objective optical
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- 230000003287 optical effect Effects 0.000 title claims abstract description 120
- 239000011521 glass Substances 0.000 claims abstract description 9
- 229910052594 sapphire Inorganic materials 0.000 claims abstract description 6
- 239000010980 sapphire Substances 0.000 claims abstract description 6
- 239000006185 dispersion Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 3
- 230000004075 alteration Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 7
- 238000003384 imaging method Methods 0.000 description 4
- 230000003902 lesion Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 2
- 230000009993 protective function Effects 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003026 hypopharynx Anatomy 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
Classifications
-
- 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
- A61B1/00064—Constructional details of the endoscope body
- A61B1/00071—Insertion part of the endoscope body
- A61B1/0008—Insertion part of the endoscope body characterised by distal tip features
- A61B1/00096—Optical elements
-
- 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
-
- 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
- G02B13/002—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
Abstract
The invention discloses an endoscope objective optical system, which sequentially comprises from an object side to an image side: the lens comprises a sapphire flat plate, an object side lens group with negative focal power, a diaphragm, a third lens with positive focal power, an infrared filter and chip protection glass, wherein the object side lens group is provided with negative focal power; the object side lens group comprises a first lens with negative focal power and a second lens with positive focal power, and the object side surface and the image side surface of the first lens are concave; the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the object side surface and the image side surface of the third lens are convex; and satisfies the following conditional expression: -1.5< (f (a) -f (b))/f < -1.4;1< (d3+d9)/T39 <1.2; the endoscope optical system can reduce the caliber of the endoscope lens to 1.85mm, can greatly relieve the pain of the patient in examination, and can clearly image the focus in the object distance range of 3-100mm, thereby being easier to find the focus in the examination process.
Description
[ field of technology ]
The present invention relates to an endoscope objective optical system.
[ background Art ]
The endoscope is a commonly used medical means at present, can enter a position of a lesion to be inspected through a natural duct of a human body, can dynamically image the condition of the lesion in real time, is widely applied to various physical inspections and treatments due to small harm to the human body, is one of the throat endoscopes, can be used for observing the condition of a glottic area, and can also be used for observing the lesions of the subglottic, laryngeal chamber, hypopharynx and upper sections of a trachea, and is transmitted to an imaging system after being imaged through the endoscope, so that the harm to a patient is greatly reduced, and diagnosis and treatment can be performed more accurately. The development of the current endoscope is mainly influenced by the caliber and the working distance, is limited by the structure of a human body, and has larger competitiveness in the market as the discomfort caused by the smaller size of the endoscope is smaller, and is particularly important for the imaging quality requirement of a larger working range.
Most of endoscope lenses used for throat examination in the market at present have apertures of more than 1.9mm, are made of glass materials, and have high single product cost. Aiming at the problems of the prior endoscope, the invention mainly aims at reducing the caliber, increasing the depth of field and reducing the cost.
[ invention ]
The invention aims to overcome the defects of the prior art, and provides the endoscope objective optical system with a simple structure, which can reduce the caliber of an endoscope lens to 1.85mm, greatly relieve the pain of a patient in examination, and can clearly image the focus in the examination process with the object distance range of 3-100 mm; in addition, the first lens, the second lens and the third lens adopt plastic aspherical lenses to replace the traditional glass lenses, so that the cost of the whole endoscope lens is reduced.
The invention is realized by the following technical scheme:
an endoscope objective optical system comprising, in order from an object side to an image side:
the lens comprises a sapphire flat plate with a protective function, an object side lens group with negative focal power, a diaphragm, a third lens with positive focal power, an infrared filter and chip protection glass;
the object side lens group includes a first lens having negative optical power and a second lens having positive optical power, and the endoscope objective lens optical system satisfies the following conditional expression:
-1.5<(f(a)-f(b))/f<-1.4；
wherein f (a) is the focal length of the object side lens group, f (b) is the focal length of the third lens, and f is the focal length of the whole endoscope objective lens optical system;
the object side surface and the image side surface of the first lens are concave surfaces;
the object side surface of the second lens is a convex surface, and the image side surface is a concave surface;
the object side surface and the image side surface of the third lens are both convex surfaces;
the first lens, the second lens and the third lens are all plastic aspherical lenses;
the above-mentioned endoscope objective optical system satisfies the following conditional expression:
1<(D3+D9)/T39<1.2；
wherein D3 is the effective diameter of the first lens object side surface; d9 is the effective diameter size of the image side surface of the third lens; t39 is the distance between the object side surface of the first lens and the image side surface of the third lens on the optical axis.
The endoscope objective optical system as described above, characterized in that the following conditional expression is satisfied:
-0.6<f1/f<-0.2；
0.4<f2/f<1；
wherein f1 is an equivalent focal length of the first lens; f2 is the equivalent focal length of the second lens; f is the focal length of the entire endoscope objective optical system.
The endoscope objective optical system as described above, characterized in that the following conditional expression is satisfied:
0.5<Y/f<1.2；
wherein Y is half image height of the endoscope objective optical system; f is the focal length of the entire endoscope objective optical system.
The endoscope objective optical system as described above, characterized in that the following conditional expression is satisfied:
0.8<tanω<1.7；
where ω is the half field angle of the endoscope objective optical system.
The endoscope objective optical system as described above is characterized in that the following conditional expression is satisfied:
0.08<Sag4/f<0.18；
wherein Sag4 is the axial distance between the intersection point of the first lens image side surface and the optical axis and the vertex of the effective radius of the first lens image side surface; f is the focal length of the entire endoscope objective optical system.
The endoscope objective optical system as described above, characterized in that the following conditional expression is satisfied:
1<(Sag4+Sag3)/(Sag4-Sag3)<3；
and Sag3 is the axial distance between the intersection point of the first lens object side surface and the optical axis and the vertex of the effective radius of the first lens object side surface.
The endoscope objective optical system as described above is characterized in that the following conditional expression is satisfied:
-0.12<(Sag5/f-Sag9/f)<-0.04；
wherein Sag5 is the axial distance between the intersection point of the second lens object side surface and the optical axis and the vertex of the effective radius of the second lens object side surface; sag9 is the on-axis distance between the intersection point of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens; f is the focal length of the entire endoscope objective optical system.
The endoscope objective optical system as described above, characterized in that the following conditional expression is satisfied:
0.1<T34/∑T<0.3；
0.2<T56/∑T<0.5；
0.3<T89/∑T<0.8；
wherein T34 is the center thickness of the first lens on the optical axis; t56 is the center thickness of the second lens on the optical axis; t89 is the center thickness of the third lens on the optical axis; Σt is the sum of the center thicknesses of the first lens, the second lens, and the third lens on the optical axis.
The endoscope objective optical system as described above, characterized in that the following conditional expression is satisfied:
0.1<T45/T34<0.3；
wherein T45 is the distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis.
The endoscope objective optical system as described above, characterized in that the following conditional expression is satisfied:
Vd1-Vd2＞30；
wherein Vd1 is the abbe number of the first lens; vd2 is the dispersion coefficient of the second lens.
Compared with the prior art, the invention has the following advantages: the endoscope objective optical system can reduce the caliber of the endoscope lens to 1.85mm, can greatly relieve the pain of the patient in examination, and can clearly image the focus in the object distance range of 3-100mm in the examination process more easily; in addition, the first lens, the second lens and the third lens adopt plastic aspherical lenses to replace the traditional glass lenses, so that the cost of the whole endoscope lens is reduced.
[ description of the drawings ]
The invention is described in further detail below with reference to the attached drawing figures, wherein:
fig. 1 is a lens cross-sectional view showing the overall structure of an objective lens optical system of an endoscope of the present invention.
Fig. 2 is an aberration diagram of an endoscope objective optical system of the present invention.
[ detailed description ] of the invention
The invention is further described below with reference to the accompanying drawings:
an endoscope objective optical system as shown in fig. 1, comprising, in order from an object side to an image side: the lens comprises a sapphire flat plate SP with a protective function, an object side lens group G01 with negative focal power, a diaphragm ST, a third lens L3 with positive focal power, an infrared filter IR and a chip protection glass GS; wherein the object side lens group G01 includes, in order from an object side to an image side, a first lens L1 having negative optical power and a second lens L2 having positive optical power.
The sapphire flat plate SP is provided with an object side surface S1 and an image side surface S2; the first lens element L1 has an object-side surface S3 and an image-side surface S4, and the object-side surface S3 and the image-side surface S4 are concave; the second lens element L2 has an object-side surface S5 and an image-side surface S6, wherein the object-side surface S5 is convex and the image-side surface is concave; a diaphragm ST is arranged between the second lens element L2 and the third lens element L3, the third lens element L3 has an object-side surface S8 and an image-side surface S9, and the object-side surface S8 and the image-side surface S9 are convex surfaces; the infrared filter IR has an object side surface S10 and an image side surface S11.
When the endoscope objective optical system of the invention is used for imaging, light rays emitted or reflected by a shot object enter the optical system from the object side surface S1 of the sapphire flat plate SP and pass through the object side surface S12 and the image side surface S13 of the chip protection glass GS, and finally are imaged on the image surface S14.
The endoscope objective optical system satisfies the following conditional expression:
-1.5<(f(a)-f(b))/f<-1.4；
wherein f (a) is the focal length of the object side lens group G01, f (b) is the focal length of the third lens L3, and f is the focal length of the entire endoscope objective lens optical system;
the endoscope objective optical system meeting the relation can correct various aberrations, such as coma aberration and chromatic aberration of magnification, on one hand by reasonably distributing the focal power of the front group lens and the rear group lens, so that the off-axis aberration of the endoscope objective optical system is still effectively controlled under the condition of a larger field angle; on the other hand, individual surface tolerance anomalies are avoided.
Meanwhile, the endoscope objective optical system also satisfies the following conditional expression:
1<(D3+D9)/T39<1.2；
wherein D3 is the effective diameter of the object side surface of the first lens element L1, D9 is the effective diameter of the image side surface of the third lens element L3, and T39 is the distance between the object side surface of the first lens element L1 and the image side surface of the third lens element L3 on the optical axis;
the aperture of the endoscope objective optical system is mainly limited by the apertures of the first lens and the third lens, the aperture of the system is limited by a (D3 +D9)/T39 relation, and the excessive relation ratio is unfavorable for controlling the whole aperture; too small is disadvantageous for correcting chromatic aberration.
Preferably, this endoscope objective optical system satisfies the following conditional expression:
-0.6<f1/f<-0.2；
0.4<f2/f<1；
wherein f1 is the equivalent focal length of the first lens L1, and f2 is the equivalent focal length of the second lens L2;
because the first lens L1 has negative focal power, the view angle of the endoscope objective optical system can be effectively increased, the relative illumination of the imaging surface S14 is ensured, and the chromatic aberration and the spherical aberration of the endoscope objective optical system can be controlled by reasonably distributing the focal power of the first lens L1 and the second lens L2.
Preferably, the endoscope objective optical system satisfies the following conditional expression:
0.5<Y/f<1.2；
wherein Y is half image height of the endoscope objective optical system;
on the one hand, the relation is to limit the structural proportion of the whole endoscope objective optical system, and when the relation exceeds the upper limit value, the caliber of the endoscope objective optical system is increased, and the requirement of the small caliber of the endoscope cannot be met; if the above-mentioned relation is lower than the lower limit value, the total length of the endoscope objective optical system becomes too long, which is disadvantageous in realizing a wide angle of the endoscope objective optical system. On the other hand, the magnification and depth of field of the whole endoscope objective optical system are balanced, when the relation exceeds the upper limit value, the magnification of the endoscope objective optical system is smaller, and the object resolution of the system is deteriorated; when the above relation is lower than the lower limit value, the endoscope objective optical system will not meet the requirement of a large depth of field.
Preferably, the endoscope objective optical system satisfies the following conditional expression:
0.8<tanω<1.7；
wherein ω is the half field angle of the endoscope objective optical system; thereby ensuring that the endoscope objective optical system has sufficient viewing angle to obtain the desired image capture range.
Preferably, an on-axis distance between an intersection point of the image side surface of the first lens L1 and the optical axis and an apex of an effective radius of the image side surface of the first lens L1 is Sag4; the endoscope objective optical system satisfies the following conditional expression:
0.08<Sag4/f<0.18；
when Sag4/f satisfies the above conditions, the first lens L1 has better workability, and can reduce the chief ray incidence angle of the field of view outside the image plane S14, and can further reduce the sensitivity of the first lens image side S4 to decentration and tilting.
Preferably, the endoscope objective optical system satisfies the following conditional expression:
1<(Sag4+Sag3)/(Sag4-Sag3)<3；
sag3 is the axial distance between the intersection point of the object side surface of the first lens L1 and the optical axis and the vertex of the effective radius of the object side surface of the first lens L1;
when (Sag4+Sag3)/(Sag4—Sag3) satisfies the above condition, it is advantageous to correct the spherical aberration of the objective lens optical system of the endoscope.
Preferably, the endoscope objective optical system satisfies the following conditional expression:
-0.12<(Sag5/f-Sag9/f)<-0.04；
sag5 is the axial distance between the intersection point of the object side surface of the second lens L2 and the optical axis and the vertex of the effective radius of the object side surface of the second lens L2; sag9 is the axial distance between the intersection point of the image side surface of the third lens element L3 and the optical axis and the vertex of the effective radius of the image side surface of the third lens element L3;
when (Sag 5/f-Sag 9/f) satisfies the above conditions, it is advantageous to correct astigmatism and spherical aberration of the objective optical system of the endoscope.
Preferably, the endoscope objective optical system satisfies the following conditional expression:
0.1<T34/∑T<0.3；
0.2<T56/∑T<0.5；
0.3<T89/∑T<0.8；
wherein T34 is the center thickness of the first lens L1 on the optical axis; t56 is the center thickness of the second lens L2 on the optical axis; t89 is the center thickness of the third lens L3 on the optical axis; Σt is the sum of the center thicknesses of the first lens L1, the second lens L2, and the third lens L3 on the optical axis;
satisfying the above conditional expression is favorable to reasonably configuring the center thicknesses of the first lens L1, the second lens L2 and the third lens L3, balancing each aberration of the endoscope objective optical system, ensuring that the lenses have a reasonable thickness ratio, and being favorable to ensuring high-precision injection molding and good assemblability.
Preferably, the endoscope objective optical system satisfies the following conditional expression:
0.1<T45/T34<0.3；
wherein T45 is the distance between the image side surface of the first lens element L1 and the object side surface of the second lens element L2 on the optical axis;
since the first lens L1 is a negative lens, it has an effect of increasing the angle of view, and when T45/T34 exceeds the upper limit value, it is unfavorable for downsizing of the system and for correction of axial chromatic aberration.
Preferably, the endoscope objective optical system satisfies the following conditional expression:
Vd1-Vd2＞30；
wherein Vd1 is the Abbe number of the first lens L1; vd2 is the dispersion coefficient of the second lens L2.
The front lens of the endoscope objective optical system consists of a negative structure and a positive structure, and the purpose of correcting chromatic aberration is achieved by increasing the difference value of chromatic dispersion coefficients of the positive and negative lenses.
As shown in fig. 2, the reference wavelengths of the three curves a, b and c in the reference aberration diagrams are 656nm, 587nm and 486nm respectively, wherein the aberration diagrams are an axial spherical aberration diagram, an astigmatic diagram and a distortion diagram in sequence from left to right, and S (solid line) and T (broken line) in the astigmatic diagram represent a sagittal image surface and a meridional image surface respectively.
The following is a table of endoscope objective optical system data for the examples:
wherein the unit of radius and thickness in Table 1 is mm,
table 1 is a structural parameter table of the endoscope objective optical system.
TABLE 1
Table 2 shows the ratio ranges of the aspherical sagittal heights of the first lens L1 and the second lens L2 to the radius R in the endoscope objective optical system.
TABLE 2
Table 3 shows the ratio ranges of the aspherical sagittal heights of the third lens L3 and the radius R of the endoscope objective optical system.
TABLE 3 Table 3
Claims (1)
1. An endoscope objective optical system comprising, in order from an object side to an image side:
a sapphire flat plate (SP) with a protective effect, an object side lens group (G01) with negative focal power, a diaphragm (ST), a third lens (L3) with positive focal power, an infrared filter (IR) and chip protection Glass (GS);
the object side lens group (G01) includes a first lens (L1) having negative optical power and a second lens (L2) having positive optical power, and the endoscope objective optical system satisfies the following conditional expression:
-1.5<(f(a)-f(b))/f<-1.4；
wherein f (a) is the focal length of the object side lens group (G01), f (b) is the focal length of the third lens (L3), and f is the focal length of the whole endoscope objective optical system;
the object side surface and the image side surface of the first lens (L1) are concave surfaces;
the object side surface of the second lens (L2) is a convex surface, and the image side surface is a concave surface;
the object side surface and the image side surface of the third lens (L3) are convex;
the first lens (L1), the second lens (L2) and the third lens (L3) are all plastic aspherical lenses;
the above-mentioned endoscope objective optical system satisfies the following conditional expression:
1<(D3+D9)/T39<1.2；
wherein D3 is the effective diameter of the object side surface of the first lens (L1); d9 is the effective diameter size of the image-side surface of the third lens element (L3); t39 is the distance between the object side surface of the first lens element (L1) and the image side surface of the third lens element (L3) on the optical axis;
the above endoscope objective optical system also satisfies the following conditional expression:
-0.6<f1/f<-0.2；
0.4<f2/f<1；
wherein f1 is the equivalent focal length of the first lens (L1); f2 is the equivalent focal length of the second lens (L2); f is the focal length of the whole endoscope objective optical system;
the above endoscope objective optical system also satisfies the following conditional expression:
0.5<Y/f<1.2；
wherein Y is half image height of the endoscope objective optical system; f is the focal length of the whole endoscope objective optical system;
0.8<tanω<1.7；
wherein ω is the half field angle of the endoscope objective optical system;
the above endoscope objective optical system also satisfies the following conditional expression:
0.08<Sag4/f<0.18；
wherein Sag4 is the axial distance between the intersection point of the image side surface of the first lens (L1) and the optical axis and the effective radius vertex of the image side surface of the first lens (L1); f is the focal length of the whole endoscope objective optical system;
the above endoscope objective optical system also satisfies the following conditional expression:
1<(Sag4+Sag3)/(Sag4-Sag3)<3；
wherein Sag3 is the axial distance between the intersection point of the object side surface of the first lens (L1) and the optical axis and the vertex of the effective radius of the object side surface of the first lens (L1);
the above endoscope objective optical system also satisfies the following conditional expression:
-0.12<(Sag5/f-Sag9/f)<-0.04；
wherein Sag5 is the axial distance between the intersection point of the object side surface of the second lens (L2) and the optical axis and the vertex of the effective radius of the object side surface of the second lens (L2); sag9 is the on-axis distance between the intersection point of the image side surface of the third lens element (L3) and the optical axis and the vertex of the effective radius of the image side surface of the third lens element (L3); f is the focal length of the whole endoscope objective optical system;
the above endoscope objective optical system also satisfies the following conditional expression:
0.1<T34/∑T<0.3；
0.2<T56/∑T<0.5；
0.3<T89/∑T<0.8；
wherein T34 is a center thickness of the first lens (L1) on an optical axis; t56 is the center thickness of the second lens (L2) on the optical axis; t89 is the center thickness of the third lens (L3) on the optical axis; Σt is the sum of the center thicknesses of the first lens (L1), the second lens (L2), and the third lens (L3) on the optical axis;
the above endoscope objective optical system also satisfies the following conditional expression:
0.1<T45/T34<0.3；
wherein T45 is the distance between the image side surface of the first lens element (L1) and the object side surface of the second lens element (L2) on the optical axis;
the above endoscope objective optical system also satisfies the following conditional expression:
Vd1-Vd2＞30；
wherein Vd1 is the dispersion coefficient of the first lens (L1); vd2 is the dispersion coefficient of the second lens (L2).
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| CN108968891A (en) | 2018-12-11 |
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