CN206331170U - Objective lens optical system - Google Patents
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- CN206331170U CN206331170U CN201621328239.2U CN201621328239U CN206331170U CN 206331170 U CN206331170 U CN 206331170U CN 201621328239 U CN201621328239 U CN 201621328239U CN 206331170 U CN206331170 U CN 206331170U
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Abstract
The utility model discloses a kind of objective lens optical system, a kind of objective lens optical system, include the first lens group with negative power, diaphragm and the second lens group with positive light coke successively from object side to image side, first lens group includes the first lens positioned at object side, satisfies the following conditional expression：f/H(L1r1)<1.9, H (L1r1)/IMH<0.75；Wherein, f is the focal length of the objective lens optical system, H (L1r1) refers to that the corresponding chief ray of maximum image height is by the height corresponding to the face of the object side of the first lens group during normal observation, maximum image height when IMH is normal observation on corresponding chip photosurface.The objective lens optical system that the utility model is provided, the characteristics of with path, big visual field wide-angle and good aberration correction.
Description
Technical field
The utility model is related to a kind of objective lens optical system.
Background technology
Endoscopic technique undergoes the development of more than 100 years, using widely.Particularly have at present many different types and
The endoscope and its system of size, applied to visual inspection in industrial structure part inside or organism.Industrial endoscope is each
Plant in rugged environment（Such as high temperature deep water, poisonous region）, even more indispensable quick detection methods；Peeped simultaneously in medical treatment
In the clinical practice of mirror, particularly Minimally Invasive Surgery, wound opening is even more reduced, the pain of patient is alleviated, operation is shortened
The time recovered afterwards, while also mitigating the work of doctor, improve the diagnostic level that visualization and science dataization judge.
A kind of lens of objective lens used for endoscope described in patent document CN201050693187.5, it is arranged in order from object side
Have the first lens of the meniscus shape of negative power, the second lens of the meniscus shape of positive light coke, diaphragm, positive light coke it is double
3rd lens of convex form and object plane side for the plano-convex exterior shape on convex surface the 4th lens, although realize the path of bore, but its
Rear cut-off distance is too short, and practical set difficulty is big, without good realizability and good production.
Recorded in patent document CN200810217205 by the first negative lens group, diaphragm, the second positive lens group structure
Into, and the second lens group is made up of the lens assembly of endoscope for forming four chip architectures positive lens and balsaming lens, using glued saturating
Microscope group can preferably be corrected to aberration, but bore is excessive and angle is smaller.
A kind of small easy endoscope head is recorded in patent document CN201520142687, it is by with negative power
Plano-concave lens and positive light coke lenticular lens constitute, simple in construction, cost is relatively low, but can not comprehensively spherical aberration corrector,
Aberration come realize gluing imaging effect, be not suitable in the system high to imaging effect requirement.
In order to reduce as far as possible to the size of patient wound or in order to observe small sized pipeline region, expect to seek endoscope thing
The path of the bore of mirror system, but because diaphragm is in the middle of objective system, seek that incident side port can be brought while wide angle
The increasing in footpath.Therefore, seeking path and getting both for wide angle also turns into technical problem.
Utility model content
The purpose of this utility model is to provide a kind of objective lens optical system, with path, visual field wide-angle be big and aberration
The characteristics of correcting good.
The technical scheme that objective lens optical system disclosed in the utility model is used is：A kind of objective lens optical system, from thing
Side includes the first lens group with negative power, diaphragm and the second lens group with positive light coke, institute to image side successively
Stating the first lens group includes the first lens positioned at object side, satisfies the following conditional expression：
f/H(L1r1)<1.9；H(L1r1)/IMH<0.75 ；Wherein, f is the focal length of the objective lens optical system, H (L1r1)
Refer to that the corresponding chief ray of maximum image height passes through the height corresponding to the face of the object side of the first lens group, IMH during normal observation
Maximum image height when being normal observation on corresponding chip photosurface.
Preferably, first lens group is also satisfied the following conditional expression：
-2.1<f_G1/f<-0.7 ；Wherein, f_G1 is the focal length of above-mentioned first lens group.
Preferably, first lens group includes the first lens and the second lens from object side to image side, described
First lens are the negative lens that image side surface is concave surface, and second lens are the positive lens that image side surface is convex surface, and described first is saturating
Microscope group is satisfied the following conditional expression：
f2/f1<-2.5；f2/f >2.0；Wherein, f1 is the focal length of first lens, and f2 is Jiao of second lens
Away from.
Preferably, second lens are also satisfied the following conditional expression：
V2<35 ；V1-V2>10；Wherein, V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.
Preferably, second lens group is satisfied the following conditional expression：
0.7<f_G2/f<1.3；Wherein, f_G2 is the focal length of above-mentioned second lens group.
Preferably, second lens group from object side to image side successively include the 3rd lens, the 4th lens and
5th lens, the 3rd lens are positive lens, and the 4th lens are the positive lens that image side surface is convex surface, the 5th lens
For the meniscus shaped negative lens that image side surface is convex surface.
Preferably, the image planes side of the 4th lens passes through transparent adhesion glue glued adhesion with the object plane side of the 5th lens
Form veneer.
Preferably, second lens group is also satisfied the following conditional expression：
f3/f<1.2 ；|f45/f|>3.4 ；Wherein f3 is the focal length of the 3rd lens, and f45 is the 4th lens and the 5th
The combined focal length of lens.
Preferably, second lens group is also satisfied the following conditional expression：
V3>40；V4-V5>20；Wherein, V3 is the Abbe number of the 3rd lens, and V4 is the Abbe number of the 4th lens, and V5 is
The Abbe number of five lens.
Preferably, first lens group and the second lens group are also satisfied the following conditional expression：
|1/(f1*V1)+1/(f2*V2)|<0.02；|1/(f3*V3)+1/(f4*V4)+1/(f5*V5)|<0.02；d_
G12/f<0.09；
Wherein, d_G12 is the axial airspace of the first lens group and the second lens group, and f4 is Jiao of the 4th lens
Away from f5 is the focal length of the 5th lens.
Preferably, first lens group and the second lens group are also satisfied the following conditional expression：
T2/TTL>0.13；BF/TTL>0.22；Wherein T2 is thickness of second lens on optical axis, and BF is the 5th lens
Distance of the image side surface to chip on optical axis, TTL be the first lens thing side to chip on optical axis distance.
Preferably, first lens, the second lens, the 3rd lens, the 4th lens and the 5th lens are ball
Face lens.
The beneficial effect of objective lens optical system disclosed in the utility model is：Pass through conditional f/H (L1r1)<1.9 pairs of things
The focal length of mirror optical system is defined, and wide angle, conditional H (L1r1)/IMH is better achieved<0.75 to conventional by seeing
The corresponding chief ray of maximum image height passes through the height H (L1r1) corresponding to the face of the object side of the first lens group and seen with conventional when examining
The ratio between maximum image height IMH when examining on corresponding chip photosurface is defined, on the premise of downsizing is realized,
Optimize curvature of the image, and difference outside axle is suppressed so that the objective lens optical system that the utility model is provided, with path
The characteristics of change, big visual field wide-angle and good aberration correction.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model objective lens optical system；
Fig. 2 is the incident schematic diagram of light beam of the utility model objective lens optical system；
Fig. 3 is the structural representation of the utility model objective lens optical system embodiment one；
Fig. 4 is the aberration curve schematic diagram of the utility model objective lens optical system embodiment one；
Fig. 5 is the structural representation of the utility model objective lens optical system embodiment two；
Fig. 6 is the aberration curve schematic diagram of the utility model objective lens optical system embodiment two；
Fig. 7 is the structural representation of the utility model objective lens optical system embodiment three；
Fig. 8 is the aberration curve schematic diagram of the utility model objective lens optical system embodiment three；
Fig. 9 is the structural representation of the utility model objective lens optical system example IV；
Figure 10 is the aberration curve schematic diagram of the utility model objective lens optical system example IV；
Figure 11 is the structural representation of the utility model objective lens optical system embodiment five；
Figure 12 is the aberration curve schematic diagram of the utility model objective lens optical system embodiment five；
Figure 13 is the structural representation of the utility model objective lens optical system embodiment six；
Figure 14 is the aberration curve schematic diagram of the utility model objective lens optical system embodiment six.
Embodiment
The utility model is further elaborated and illustrated with reference to specific embodiment and Figure of description：
Fig. 1 is refer to, it is saturating that a kind of objective lens optical system includes first with negative power from object side to image side successively
Microscope group 10, diaphragm 30 and the second lens group 20 with positive light coke.Reference 40 represents optical filter, is mainly used for cut-off
Specific wavelength；50 represent plate glass, the photosurface of main protection sensor；60 represent the photosurface of sensor.Described first
Lens group 10 by negative power that image side surface is concave surface the first lens 11 and positive light coke that image side surface is convex surface it is second saturating
Mirror 12 is constituted, and the second lens group 20 is burnt by the 3rd lens 21 of positive light coke, the 4th lens 22 of positive light coke and with negative light
Degree, image side surface are constituted for the 5th lens 23 of meniscus shaped on convex surface, first lens 11, the second lens 12, the 3rd lens 21,
4th lens 22 and the 5th lens 23 are spherical lens.
Objective lens optical system including the first lens group, diaphragm and the second lens group is satisfied the following conditional expression：
f/H(L1r1)<1.9；（1）
H(L1r1)/IMH<0.75；（2）
-2.1<f_G1/f<-0.7；（3）
f2/f1<-2.5；（4）
f2/f >2.0；（5）
V2<35；（6）
V1-V2>10；（7）
0.7<f_G2/f<1.3；（8）
f3/f<1.2；（9）
|f45/f|>3.4；（10）
V3>40;（11）
V4-V5>20；（12）
|1/(f1*V1)+1/(f2*V2)|<0.02；（13）
|1/(f3*V3)+1/(f4*V4)+1/(f5*V5)|<0.02；（14）
d_G12/f<0.09；（15）
T2/TTL>0.13；（16）
BF/TTL>0.22；（17）
Wherein, f is the focal length of the objective lens optical system, and f1 is the focal length of the first lens 11, and f2 is Jiao of the second lens 12
Away from f3 is the focal length of the 3rd lens 21, and f4 is the focal length of the 4th lens 22, and f5 is the focal length of the 5th lens 23, and H (L1r1) refers to
The corresponding chief ray of maximum image height is by the height corresponding to the face of the object side of the first lens group 10 during normal observation, and IMH is
Maximum image height during normal observation on corresponding chip photosurface, f_G1 is the focal length of above-mentioned first lens group 10, and f_G2 is
The focal length of two lens groups 20, V1 is the Abbe number of the first lens 11, and V2 is the Abbe number of the second lens 12, and V3 is the 3rd lens 21
Abbe number, V4 is the Abbe number of the 4th lens 22, and V5 is the Abbe number of the 5th lens 23, and f45 is the 4th lens 22 and the 5th
The combined focal length of lens 23, d_G12 is the axial airspace of the first lens group 10 and the second lens group 20, and T2 is second saturating
Thickness of the mirror 12 on optical axis, BF is distance of the image side surface of the 5th lens 23 to chip on optical axis, and TTL is the first lens 11
Thing side distance on optical axis to chip.
Fig. 2 is refer to, observation axle outer light beam is understood, in the thing side 1 of the first lens 11, the axle outer light beam from wide-angle
With the thing of larger incident angles to the first lens 11 sideways, it is compressed into after the refraction of the first lens group 10 through diaphragm smaller
Angle incidence enter the second lens group 20, the first lens group 10 have negative power, will transmit through the light beam of the first lens group 10
Diverging, the second lens group 20 has positive light coke, and the light beam that will transmit through the second lens group 20 is assembled.It can be seen by above-mentioned opticpath
The focal length for going out to reduce objective lens optical system is conducive to the wide angle of objective lens optical system, but reduces the focal length of optical system, then can
Stronger curvature of the image is produced, and difference suppresses more difficult outside axle.Thus conditional（1）Pass through Jiao to objective lens optical system
Away from being defined, wide angle, conditional is better achieved（2）The corresponding chief ray of maximum image height passes through during by normal observation
Maximum when height H (L1r1) corresponding to the face of the object side of first lens group is with normal observation on corresponding chip photosurface
Ratio between image height IMH is defined, on the premise of downsizing is realized, optimize curvature of the image, and to differed outside axle into
Row suppresses.
Conditional（3）Angular to the first lens group is defined, and objective lens optical system configuration is had rationally negative light
First lens group of focal power, can realize the downsizing of objective lens optical system, and configuration is not required to again has stronger positive light coke
Second lens group, simplifies aberration correction, while avoiding the negative power of the first lens group very few and causing objective lens optical system axle
It is oversize to length.
Conditional（4）And conditional（5）The positive light coke of second lens is defined, off-axis image can be preferably corrected
Difference.
The combination of materials of different Abbe numbers can preferably eliminate the aberration of objective lens optical system, pass through conditional（6）And bar
Part formula（7）Restriction the second lens 12 and the first lens 11 Abbe number, the aberration of off-axis ray is corrected.
The focal power of second lens group is too weak, then can not effectively assemble the light projected from the first lens group, focal power
It is excessive, then increase the aberration of the outer focal power of axle, increase the cost of objective lens optical system, pass through conditional（8）To the second lens group
Focal power be defined, make it have rational positive light coke, can preferably aberration correction and balance cost.
Second lens group includes the 3rd lens 21, the 4th lens 22 and the 5th lens 23 from thing side to image side successively, described
3rd lens 21 are positive lens, are mainly used in assembling light, the 4th lens 22 are the positive lens that image side surface is convex surface, described
5th lens 23 are the meniscus shaped negative lens that image side surface is convex surface, and the image side surface of the 4th lens 22 and the thing of the 5th lens 23 are sideways
By transparent adhesion glue glued adhesion formation veneer, for eliminating aberration, particularly aberration.Meet conditional（9）And conditional
（10）, no matter the 4th lens 22 and the gluing of the 5th lens 23 or separation, can realize preferable aberration correction.
The 3rd lens 21 that the larger material of Abbe number is made can reduce newly-increased aberration, be particularly conducive to the school of off-axis aberration
Just, the correction of the 4th lens 22 and the 5th lens 23 configuration Abbe number difference big material, more conducively aberration, particularly aberration,
Conditional（11）And conditional（12）The Abbe number of 3rd lens 21, the 4th lens 22 and the 5th lens 23 is defined.For
Preferably correct the aberration of objective lens optical system, conditional（13）, conditional（14）And conditional（15）To the first lens group
The focal length and Abbe number of each lens and each lens of the second lens group are defined.Reduce the first lens group and the second lens group exists
Airspace on axle, is conducive to the miniaturization of objective lens optical system bore.
In order to coordinate the characteristic of chip in itself, it is desirable to which the chief ray angle on incident chip can not be too big, conditional（16）
And conditional（17）The thickness of second lens is defined, reduces the refraction angle of light, reduces the key light for inciding chip
The angle of line.
In order to reduce the cost of objective lens optical system, each lens of constitute the objective lens optical system all select spherical lens.
Hereinafter, the embodiment 1-7 that Fig. 3-Figure 14 illustrates the objective lens optical system of the embodiment above is refer to, in each reality
Apply in example, r represents radius of curvature (unit mm), as r1 represents the radius of curvature of the first lens thing side, r2 represents the first lens
The radius of curvature of image side surface, r3 represents the radius of curvature of the second lens thing side, the like, d represents face interval, and such as d1 is represented
First lens thing side and interval of the image side surface on optical axis, d2 represent the first lens image side surface and the second lens thing sideways
Interval on optical axis, the like, Nd represents the refractive index of relative d lines, and Vd represents the Abbe number of relative d lines.
Embodiment 1
The structure of the objective lens optical system of Fig. 3 embodiments 1 is refer to, in the objective lens optical system of the present embodiment, first
Lens are negative lens, and the second lens are the weaker positive lens of focal power, and the 3rd lens are positive lens, and the 4th lens are positive lens,
5th lens are bent moon negative lens.The various aberration curve figures of the present embodiment refer to Fig. 4.
As table 1 below shows each lens data of the objective lens optical system of the present embodiment.
The embodiment 2 of table 1：The structure of the objective lens optical system of Fig. 5 embodiments 2 is refer to, in the object lens optics of the present embodiment
In system, the first lens are negative lens, and the second lens are the weaker positive lens of focal power, and the 3rd lens are positive lens, and the 4th is saturating
Mirror is positive lens, and the 5th lens are bent moon negative lens.It refer to Fig. 6 aberration curve figures.
As table 2 below shows the lens data of the objective lens optical system of embodiment 2 of the present utility model.
The embodiment 3 of table 2：The structure of the objective lens optical system of Fig. 7 embodiments 3 is refer to, in the object lens optics of the present embodiment
In system, the first lens are negative lens, and the second lens are the weaker positive lens of focal power, and the 3rd lens are positive lens, and the 4th is saturating
Mirror is positive lens, and the 5th lens are bent moon negative lens.It refer to Fig. 8 aberration curve figures.
Table 3 below shows the lens data of the objective lens optical system of embodiment 3.
The embodiment 4 of table 3：The structure of the objective lens optical system of Fig. 9 embodiments 4 is refer to, in the object lens optics of the present embodiment
In system, the first lens are negative lens, and the second lens are the weaker positive lens of focal power, and the 3rd lens are positive lens, and the 4th is saturating
Mirror is positive lens, and the 5th lens are bent moon negative lens.It refer to Figure 10 aberration curve figures.
As table 4 below shows the lens data of the objective lens optical system of embodiment 4.
The embodiment 5 of table 4：The structure of the objective lens optical system of Figure 11 embodiments 5 is refer to, in the object lens optics of the present embodiment
In system, the first lens are negative lens, and the second lens are the weaker positive lens of focal power, and the 3rd lens are positive lens, and the 4th is saturating
Mirror is positive lens, and the 5th lens are bent moon negative lens.It refer to Figure 12 aberration curve figures.
As table 5 below shows the lens data of the objective lens optical system of embodiment 5.
The embodiment 6 of table 5：The structure of the objective lens optical system of Figure 13 embodiments 6 is refer to, in the object lens optics of the present embodiment
In system, the first lens are negative lens, and the second lens are the weaker positive lens of focal power, and the 3rd lens are positive lens, and the 4th is saturating
Mirror is positive lens, and the 5th lens are bent moon negative lens, the 4th lens and the 5th lens glue integrator.It refer to Figure 14 aberrations bent
Line chart.
Show the lens data of the objective lens optical system of embodiment 6 of the present utility model below.（It is glued）
As can be seen here, the utility model can be provided seeks path, wide-angle and the good object lens light of aberration correction to table 6
System.
Finally it should be noted that above example is only illustrating the technical solution of the utility model, rather than to this reality
With the limitation of novel protected scope, although being explained with reference to preferred embodiment to the utility model, this area it is general
Lead to it will be appreciated by the skilled person that can be modified to the technical solution of the utility model or equivalent, without departing from this
The spirit and scope of utility model technical scheme.
Claims (12)
1. a kind of objective lens optical system, include successively from object side to image side the first lens group with negative power, diaphragm and
The second lens group with positive light coke, first lens group includes the first lens positioned at object side, it is characterised in that full
It is enough lower conditional：
f/H(L1r1)<1.9；H(L1r1)/IMH<0.75；Wherein, f is the focal length of the objective lens optical system, and H (L1r1) refers to often
The corresponding chief ray of maximum image height is by the height corresponding to the face of the object side of the first lens group during rule observation, and IMH is conventional
Maximum image height during observation on corresponding chip photosurface.
2. objective lens optical system according to claim 1, it is characterised in that first lens group also meets following condition
Formula：
-2.1<f_G1/f<-0.7 ；Wherein, f_G1 is the focal length of above-mentioned first lens group.
3. objective lens optical system according to claim 2, it is characterised in that first lens group is from object side to image side
Including the first lens and the second lens, first lens are the negative lens that image side surface is concave surface, and second lens are image side
Face is the positive lens on convex surface, and first lens group is satisfied the following conditional expression：
f2/f1<-2.5；f2/f >2.0；Wherein, f1 is the focal length of first lens, and f2 is the focal length of second lens.
4. objective lens optical system according to claim 3, it is characterised in that second lens also meet following condition
Formula：
V2<35 ；V1-V2>10；Wherein, V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.
5. the objective lens optical system according to claim any one of 1-4, it is characterised in that second lens group meet with
Lower conditional：
0.7<f_G2/f<1.3；Wherein, f_G2 is the focal length of above-mentioned second lens group.
6. objective lens optical system according to claim 5, it is characterised in that second lens group is from object side to image side
Include the 3rd lens, the 4th lens and the 5th lens successively, the 3rd lens are positive lens, and the 4th lens are image side surface
For the positive lens on convex surface, the 5th lens are the meniscus shaped negative lens that image side surface is convex surface.
7. objective lens optical system according to claim 6, it is characterised in that the image planes side of the 4th lens and the 5th saturating
The object plane side of mirror passes through transparent adhesion glue glued adhesion formation veneer.
8. the objective lens optical system according to claim 6 or 7, it is characterised in that：Second lens group also meets following
Conditional：
f3/f<1.2 ；|f45/f|>3.4 ；Wherein f3 is the focal length of the 3rd lens, and f45 is the 4th lens and the 5th lens
Combined focal length.
9. objective lens optical system according to claim 8, it is characterised in that second lens group also meets following condition
Formula：
V3>40；V4-V5>20；Wherein, V3 is the Abbe number of the 3rd lens, and V4 is the Abbe number of the 4th lens, and V5 is the 5th saturating
The Abbe number of mirror.
10. objective lens optical system according to claim 9, it is characterised in that first lens group and the second lens group
Also satisfy the following conditional expression：
|1/(f1*V1)+1/(f2*V2)|<0.02；|1/(f3*V3)+1/(f4*V4)+1/(f5*V5)|<0.02;d_G12/f<
0.09；
Wherein, d_G12 is the axial airspace of the first lens group and the second lens group, and f4 is the focal length of the 4th lens, f5
It is the focal length of the 5th lens.
11. objective lens optical system as claimed in claim 10, it is characterised in that first lens group and the second lens group are also
Satisfy the following conditional expression：
T2/TTL>0.13；BF/TTL>0.22；Wherein T2 is thickness of second lens on optical axis, and BF is the image side of the 5th lens
Distance of the face to chip on optical axis, TTL be the first lens thing side to chip on optical axis distance.
12. the objective lens optical system according to claim any one of 1-4, it is characterised in that first lens, second saturating
Mirror, the 3rd lens, the 4th lens and the 5th lens are spherical lens.
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| CN201621328239.2U CN206331170U (en) | 2016-12-02 | 2016-12-02 | Objective lens optical system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646824A (en) * | 2016-12-02 | 2017-05-10 | 东莞市宇光光电科技有限公司 | Object lens optical system |
| CN111095069A (en) * | 2017-09-12 | 2020-05-01 | Hoya株式会社 | Objective lens unit for endoscope and endoscope |
-
2016
- 2016-12-02 CN CN201621328239.2U patent/CN206331170U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646824A (en) * | 2016-12-02 | 2017-05-10 | 东莞市宇光光电科技有限公司 | Object lens optical system |
| CN106646824B (en) * | 2016-12-02 | 2022-12-02 | 东莞市宇光光电科技有限公司 | Objective optical system |
| CN111095069A (en) * | 2017-09-12 | 2020-05-01 | Hoya株式会社 | Objective lens unit for endoscope and endoscope |
| CN111095069B (en) * | 2017-09-12 | 2022-01-11 | Hoya株式会社 | Objective lens unit for endoscope and endoscope |
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