CN108968891A - A kind of endoscope objective optical system - Google Patents
A kind of endoscope objective optical system Download PDFInfo
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- CN108968891A CN108968891A CN201810521217.5A CN201810521217A CN108968891A CN 108968891 A CN108968891 A CN 108968891A CN 201810521217 A CN201810521217 A CN 201810521217A CN 108968891 A CN108968891 A CN 108968891A
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- objective optical
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- 230000003287 optical effect Effects 0.000 title claims abstract description 118
- 239000011521 glass Substances 0.000 claims abstract description 10
- 239000000571 coke Substances 0.000 claims abstract description 8
- 229910052594 sapphire Inorganic materials 0.000 claims abstract description 6
- 239000010980 sapphire Substances 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 8
- 238000007689 inspection Methods 0.000 abstract description 7
- 230000003902 lesion Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 230000004075 alteration Effects 0.000 description 13
- 201000009310 astigmatism Diseases 0.000 description 3
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 206010010071 Coma Diseases 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 210000004704 glottis Anatomy 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
- 239000000203 mixture Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 244000144985 peep Species 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 230000001755 vocal effect Effects 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
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Surgery (AREA)
- Optics & Photonics (AREA)
- Biomedical Technology (AREA)
- Medical Informatics (AREA)
- Radiology & Medical Imaging (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Biophysics (AREA)
- Heart & Thoracic Surgery (AREA)
- Pathology (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- General Physics & Mathematics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a kind of endoscope objective optical systems, from the object side to image side successively include: sapphire plate, the object side lens group with negative power, diaphragm, the third lens with positive light coke, infrared fileter, and chip protects glass；Wherein, object side lens group includes first lens with negative power and the second lens with positive light coke, and the first lens object side and image side surface are concave surface；Second lens object side is convex surface, and image side surface is concave surface；The third lens object side and image side surface are convex surface；And meet following conditionals: -1.5 < (f (a)-f (b))/f < -1.4；1<(D3+D9)/T39<1.2；The endoscope optical system can make endoscope lens bore narrow down to 1.85mm, can greatly mitigate patient inspection pain, while its can blur-free imaging object distance range be 3-100mm, during the inspection process be easier discovery lesion.
Description
[technical field]
The present invention relates to a kind of endoscope objective optical systems.
[background technique]
Endoscope is a kind of medical procedure being in daily use at present, and arrival can be entered through the natural hole of human body to be checked
Lesion position, real-time dynamic imaging is carried out to lesion situation, due to being widely used in items to human injury's very little
The case where physical examination and treatment, throat endoscope is exactly one of which, can not only see vocal area clearly, glottis can also be observed
Under, Hilton's sac, hypopharynx and tracheae upper section lesion, imaging system is transferred to after endoscopic imaging, is not only greatly mitigated pair
The injury of patient more can also accurately carry out diagnosing and treating.The development of current endoscope is mainly by caliber size and work
The influence for making distance, is limited by organization of human body, and the volume of endoscope is smaller, smaller to sense of discomfort caused by human body, in the market
To there is bigger competitiveness, requires also to be particularly important simultaneously for the image quality of more wide working range.
The endoscope lens bore of throat inspection is mostly used on the market at present in 1.9mm or more, and is glass material
Material, single-item higher cost.The present invention existing endoscope there are aiming at the problem that, be directed generally to reduce bore, increase the depth of field and
Reduce cost.
[summary of the invention]
The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a kind of simple endoscope lens optical systems of structure
System, the endoscope objective optical system can make endoscope lens bore narrow down to 1.85mm, can greatly mitigate patient's inspection
Pain, while the endoscope optical system can blur-free imaging object distance range be 3-100mm, during the inspection process be easier send out
Existing lesion；In addition, first lens, the second lens and the third lens replace traditional glass mirror using plastic cement aspherical lens
Piece reduces the cost of entire endoscope lens.
The present invention is achieved by the following technical solutions:
A kind of endoscope objective optical system successively includes: from the object side to image side
Sapphire plate with protective effect, the object side lens group with negative power, diaphragm, with positive light coke
The third lens, infrared fileter, chip protect glass；
Object side lens group includes first lens with negative power and the second lens with positive light coke, it is described in peep
Endoscope objective lens optical system meets following condition formulae:
-1.5<(f(a)-f(b))/f<-1.4；
Wherein, f (a) is the focal length of object side lens group, and f (b) is the focal length of the third lens, and f is entire endoscope lens light
The focal length of system；
The object side of first lens and image side surface are concave surface；
The second lens object side is convex surface, and image side surface is concave surface；
The object side of the third lens and image side surface are convex surface；
First lens, the second lens, the third lens are plastic cement aspherical lens；
Above-mentioned endoscope objective optical system meets following condition formulae:
1<(D3+D9)/T39<1.2；
Wherein, D3 is the effective diameter size of the first lens object side；D9 is the effective of the third lens image side surface
Diameter size；T39 is the first lens object side at a distance from the third lens image side surface is on optical axis.
Endoscope objective optical system as described above, which is characterized in that meet following condition formulae:
-0.6<f1/f<-0.2；
0.4<f2/f<1；
Wherein, f1 is the equivalent focal length of first lens；F2 is the equivalent focal length of second lens；F is in entire
The focal length of sight glass objective lens optical system.
Endoscope objective optical system as described above, which is characterized in that meet following condition formulae:
0.5<Y/f<1.2；
Wherein, Y is half image height of the endoscope objective optical system；F is the focal length of entire endoscope objective optical system.
Endoscope objective optical system as described above, which is characterized in that meet following condition formulae:
0.8<tanω<1.7；
Wherein, ω is the angle of half field-of view of the endoscope objective optical system.
Endoscope objective optical system as described above, which is characterized in that meet following conditionals:
0.08<Sag4/f<0.18；
Wherein, Sag4 is the intersection point of the first lens image side surface and optical axis to the first lens image side surface effective radius vertex
Between axis on distance；F is the focal length of entire endoscope objective optical system.
Endoscope objective optical system as described above, which is characterized in that meet following condition formulae:
1<(Sag4+Sag3)/(Sag4-Sag3)<3；
Wherein, Sag3 is the intersection point of the first lens object side and optical axis to the first lens object side effective radius vertex
Between axis on distance.
Endoscope objective optical system as described above, which is characterized in that meet following conditionals:
-0.12<(Sag5/f-Sag9/f)<-0.04；
Wherein, Sag5 is the intersection point of the second lens object side and optical axis to the second lens object side effective radius vertex
Between axis on distance；Sag9 be the third lens image side surface and optical axis intersection point to the third lens image side surface effective radius vertex it
Between axis on distance；F is the focal length of entire endoscope objective optical system.
Endoscope objective optical system as described above, which is characterized in that meet following condition formulae:
0.1<T34/∑T<0.3；
0.2<T56/∑T<0.5；
0.3<T89/∑T<0.8；
Wherein, T34 is center thickness of first lens on optical axis；T56 is center of second lens on optical axis
Thickness；T89 is center thickness of the third lens on optical axis；∑ T is the first lens, the second lens and the third lens on optical axis
Center thickness summation.
Endoscope objective optical system as described above, which is characterized in that meet following condition formulae:
0.1<T45/T34<0.3；
Wherein, T45 is the distance of the first lens image side surface and the second lens object side on optical axis.
Endoscope objective optical system as described above, which is characterized in that meet following condition formulae:
Vd1-Vd2 > 30；
Wherein, Vd1 is the abbe number of first lens；Vd2 is the abbe number of the second lens.
Compared with prior art, the present invention has the following advantages: the endoscope objective optical system can make endoscope
Head bore narrow down to 1.85mm, can greatly mitigate patient inspection pain, while the endoscope optical system can clearly at
The object distance range of picture is 3-100mm, is easier discovery lesion during the inspection process；In addition, first lens, the second lens and
Three lens replace traditional glass lens using plastic cement aspherical lens, reduce the cost of entire endoscope lens.
[Detailed description of the invention]
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing, in which:
Fig. 1 is a kind of integrally-built lens sectional view of endoscope objective optical system of the invention.
Fig. 2 is the aberration curve figure of endoscope objective optical system of the invention.
[specific embodiment]
The invention will be further described below in conjunction with the accompanying drawings:
A kind of endoscope objective optical system as shown in Figure 1, IMG successively includes: that there is protection to make from the object side to image side
Sapphire plate SP, object side lens group G01, diaphragm ST with negative power, the third lens L3 with positive light coke,
Infrared fileter IR, chip protect glass GS；Wherein, the object side lens group G01 successively includes having to bear from the object side to image side
First lens L1 of focal power and the second lens L2 with positive light coke.
The sapphire plate SP has object side S1 and image side surface S2；First lens L1 has object side S3 and image side surface
S4, and object side S3 and image side surface S4 are concave surface；Second lens L2 has object side S5 and image side surface S6, and object side S5 is
Convex surface, image side surface are concave surface；Diaphragm ST among second lens L2 and the third lens L3, the third lens L3 have object side S8 and
Image side surface S9, and object side S8 and image side surface S9 are convex surface；Infrared fileter IR has object side S10 and image side surface S11.
When the endoscope objective optical system imaging of the invention, subject is issued or the light of reflection is flat from sapphire
The object side S1 of plate SP enters optical system and passes through the object side S12 and image side surface S13 of chip protection glass GS, finally in picture
It is imaged on the S14 of face.
The endoscope objective optical system meets following conditionals:
-1.5<(f(a)-f(b))/f<-1.4；
Wherein, f (a) is the focal length of object side lens group G01, and f (b) is the focal length of the third lens L3, and f is entire endoscope object
The focal length of mirror optical system；
The endoscope objective optical system for meeting above-mentioned relation formula passes through the light focus of reasonable distribution front group and rear group lens
Degree, on the one hand can correct various aberrations, such as coma and ratio chromatism, so that the endoscope objective optical system is in larger view
In the case where rink corner, off-axis aberration is still effectively controlled；It on the other hand, can be to avoid individual surface tolerance quite sensitive.
Meanwhile the endoscope objective optical system also meets following conditionals:
1<(D3+D9)/T39<1.2；
Wherein, D3 is the effective diameter size of the first lens L1 object side, and D9 is that the effective diameter of the third lens L3 image side surface is big
Small, T39 is the first lens L1 object side at a distance from the third lens L3 image side surface is on optical axis；
The bore of the endoscope objective optical system is mainly limited by the bore of the first lens and the third lens, needs to pass through
(D3+D9)/T39 relational expression limits system bore, this relational expression ratio is excessive, be unfavorable for controlling entire bore；It is too small then
It is unfavorable for correcting chromatic aberration.
Preferably, this endoscope objective optical system meets following conditionals:
-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；
Since the first lens L1 has negative power, it can effectively increase the field angle of endoscope objective optical system, and
Guarantee that the relative illumination of imaging surface S14 is conducive to control by the focal power of reasonable distribution the first lens L1 and the second lens L2
The color difference and spherical aberration of this endoscope objective optical system.
Preferably, endoscope objective optical system meets following conditionals:
0.5<Y/f<1.2；
Wherein, Y is half image height of the endoscope objective optical system；
Above-mentioned relation formula one side is the structure proportion for limiting entire endoscope objective optical system, when above-mentioned relation formula is super
When crossing upper limit value, the bore of endoscope objective optical system will be will increase, and not be able to satisfy the small-bore requirement of endoscope；When above-mentioned
When relational expression is lower than lower limit value, endoscope objective optical system overall length will be too long, is unfavorable for realizing endoscope objective optical system
Wide angle.On the other hand it is the enlargement ratio and depth of field size for balancing entire endoscope objective optical system, works as above-mentioned relation
When formula is more than upper limit value, the enlargement ratio of endoscope objective optical system will be less than normal, and the object space resolution ratio of system will be deteriorated therewith；
When above-mentioned relation formula is lower than lower limit value, endoscope objective optical system will not be able to satisfy the requirement of the big depth of field.
Preferably, endoscope objective optical system meets following conditionals:
0.8<tanω<1.7；
Wherein, ω is the angle of half field-of view of the endoscope objective optical system；Ensure that endoscope objective optical system has with this
Enough visual angles are to obtain required imaging range.
Preferably, the intersection point of the first lens L1 image side surface and optical axis is to the first lens L1 image side surface effective radius vertex
Between axis on distance be Sag4；The endoscope objective optical system meets following conditionals:
0.08<Sag4/f<0.18；
When Sag4/f meets above-mentioned condition, the first lens L1 has preferable processability, can reduce and regards outside image planes S14
In addition the chief ray incidence angles of field can reduce the first lens image side surface S4 to eccentric and inclined susceptibility.
Preferably, the endoscope objective optical system meets following condition formulae:
1<(Sag4+Sag3)/(Sag4-Sag3)<3；
Wherein, Sag3 is the intersection point of the first lens L1 object side and optical axis to the first lens L1 object side effective radius vertex
Between axis on distance；
When (Sag4+Sag3)/(Sag4-Sag3) meets above-mentioned condition, be conducive to correct endoscope objective optical system
Spherical aberration.
Preferably, the endoscope objective optical system meets following condition formulae:
-0.12<(Sag5/f-Sag9/f)<-0.04；
Wherein, Sag5 is the intersection point of the second lens L2 object side and optical axis to the second lens L2 object side effective radius vertex
Between axis on distance；Sag9 is the intersection point of the third lens L3 image side surface and optical axis to the third lens L3 image side surface effective radius top
Distance on axis between point；
When (Sag5/f-Sag9/f) meets above-mentioned condition, be conducive to correct endoscope objective optical system astigmatism and
Spherical aberration.
Preferably, endoscope objective optical system meets following conditionals:
0.1<T34/∑T<0.3；
0.2<T56/∑T<0.5；
0.3<T89/∑T<0.8；
Wherein, T34 is center thickness of the first lens L1 on optical axis；T56 is center of the second lens L2 on optical axis
Thickness；T89 is center thickness of the third lens L3 on optical axis；∑ T is the first lens L1, the second lens L2 and the third lens L3
The summation of center thickness on optical axis；
Meet the center thickness that the above conditions are conducive to the first lens of reasonable disposition L1, the second lens L2 and the third lens L3
Degree, balances each aberration of endoscope objective optical system, while guaranteeing that eyeglass has reasonable thickness ratio, advantageously ensures that high-precision
The injection molding of degree and good assembling capacity.
Preferably, endoscope objective optical system meets following conditionals:
0.1<T45/T34<0.3；
Wherein, T45 is the distance of the first lens L1 image side surface and the second lens L2 object side on optical axis；
Since the first lens L1 is negative lens, have the function of increasing field angle, when T45/T34 is more than upper limit value, no
Conducive to the miniaturization of system, it is unfavorable for the correction of axial chromatic aberration.
Preferably, endoscope objective optical system meets following conditionals:
Vd1-Vd2 > 30；
Wherein, Vd1 is the abbe number of the first lens L1；Vd2 is the abbe number of the second lens L2.
Lens are organized before endoscope objective optical system by negative and positive structure composition, by the difference for increasing positive and negative lens achromatic coefficient
Value achievees the purpose that correcting chromatic aberration.
As shown in Fig. 2, the ginseng of the endoscope objective optical system tri- curves of a, b, c in the aberration curve figure of institute's reference
Examining wavelength is respectively 656nm, 587nm, 486nm, and wherein aberration curve figure is followed successively by axial spherical aberration figure, astigmatism from the left side toward the right
Figure and distortion figure, and the S (solid line) and T (dotted line) in astigmatism figure respectively represent sagittal image surface and meridianal image surface.
The following are the endoscope objective optical system tables of data of embodiment:
Wherein, the unit of the radius in table 1 and thickness is mm,
Table 1 is the structural parameters table of the endoscope objective optical system.
Table 1
Each aspherical rise and radius R that table 2 is the endoscope objective optical system the first lens L1 and the second lens L2
Ratio range.
Table 2
Table 3 is the ratio range of endoscope objective optical system the third lens L3 each aspherical rise and radius R.
Table 3
Claims (10)
1. a kind of endoscope objective optical system, successively includes: from the object side to image side
Sapphire plate (SP) with protective effect, the object side lens group (G01) with negative power, diaphragm (ST) have
The third lens (L3) of positive light coke, infrared fileter (IR), chip protect glass (GS)；
Object side lens group (G01) includes first lens (L1) with negative power and the second lens with positive light coke
(L2), the endoscope objective optical system meets following condition formulae:
-1.5<(f(a)-f(b))/f<-1.4；
Wherein, f (a) is the focal length of object side lens group (G01), and f (b) is the focal length of the third lens (L3), and f is entire endoscope object
The focal length of mirror optical system；
The object side of first lens (L1) and image side surface are concave surface；
Second lens (L2) the object side is convex surface, and image side surface is concave surface；
The object side of the third lens (L3) and image side surface are convex surface；
First lens (L1), the second lens (L2), the third lens (L3) are plastic cement aspherical lens；
Above-mentioned endoscope objective optical system meets following condition formulae:
1<(D3+D9)/T39<1.2；
Wherein, D3 is the effective diameter size of the first lens (L1) object side；D9 is the third lens (L3) image side surface
Effective diameter size；T39 is the first lens (L1) object side at a distance from the third lens (L3) image side surface is on optical axis.
2. endoscope objective optical system according to claim 1, which is characterized in that meet following condition formulae:
-0.6<f1/f<-0.2；
0.4<f2/f<1；
Wherein, f1 is the equivalent focal length of first lens (L1)；F2 is the equivalent focal length of second lens (L2)；F is whole
The focal length of a endoscope objective optical system.
3. endoscope objective optical system according to claim 1, which is characterized in that meet following condition formulae:
0.5<Y/f<1.2；
Wherein, Y is half image height of the endoscope objective optical system；F is the focal length of entire endoscope objective optical system.
4. endoscope objective optical system according to claim 1, which is characterized in that meet following condition formulae:
0.8<tanω<1.7；
Wherein, ω is the angle of half field-of view of the endoscope objective optical system.
5. endoscope objective optical system according to claim 1, which is characterized in that meet following conditionals:
0.08<Sag4/f<0.18；
Wherein, Sag4 is the intersection point of the first lens (L1) image side surface and optical axis to the first lens (L1) image side surface effective radius
Distance on axis between vertex；F is the focal length of entire endoscope objective optical system.
6. endoscope objective optical system according to claim 5, which is characterized in that meet following condition formulae:
1<(Sag4+Sag3)/(Sag4-Sag3)<3；
Wherein, Sag3 is the intersection point of the first lens (L1) object side and optical axis to the first lens (L1) object side effective radius
Distance on axis between vertex.
7. endoscope objective optical system according to claim 1, which is characterized in that meet following conditionals:
-0.12<(Sag5/f-Sag9/f)<-0.04；
Wherein, Sag5 is the intersection point of the second lens (L2) object side and optical axis to the second lens (L2) object side effective radius
Distance on axis between vertex；Sag9 has for intersection point to the third lens (L3) image side surface of the third lens (L3) image side surface and optical axis
Imitate distance on the axis between radius vertex；F is the focal length of entire endoscope objective optical system.
8. endoscope objective optical system according to claim 1, which is characterized in that meet following condition formulae:
0.1<T34/∑T<0.3；
0.2<T56/∑T<0.5；
0.3<T89/∑T<0.8；
Wherein, T34 is center thickness of first lens (L1) on optical axis；T56 is the second lens (L2) on optical axis
Center thickness；T89 is the center thickness of the third lens (L3) on optical axis；∑ T be the first lens (L1), the second lens (L2) and
The summation of center thickness of the third lens (L3) on optical axis.
9. endoscope objective optical system according to claim 8, which is characterized in that meet following condition formulae:
0.1<T45/T34<0.3；
Wherein, T45 is the distance of the first lens (L1) image side surface and the second lens (L2) object side on optical axis.
10. endoscope objective optical system according to claim 1, which is characterized in that meet following condition formulae:
Vd1-Vd2 > 30；
Wherein, Vd1 is the abbe number of first lens (L1)；Vd2 is the abbe number of the second lens (L2).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114384678A (en) * | 2022-03-24 | 2022-04-22 | 浙江华诺康科技有限公司 | Objective lens for endoscope and endoscope |
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| CN114384678A (en) * | 2022-03-24 | 2022-04-22 | 浙江华诺康科技有限公司 | Objective lens for endoscope and endoscope |
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| CN108968891B (en) | 2024-03-22 |
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