CN207473186U - A kind of small-bore optical system for endoscope - Google Patents
A kind of small-bore optical system for endoscope Download PDFInfo
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- CN207473186U CN207473186U CN201721683882.1U CN201721683882U CN207473186U CN 207473186 U CN207473186 U CN 207473186U CN 201721683882 U CN201721683882 U CN 201721683882U CN 207473186 U CN207473186 U CN 207473186U
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Abstract
The utility model is related to a kind of small-bore optical systems for endoscope; first lens (1), optical filter (2), fixed aperture (3), the second lens (4), third lens (5), the 4th lens (6), chip protective glass (7) are equipped with by object plane to image planes successively, endoscope optical system meets relationship：1<|fb/f|<1.8；0.7<|fa/f|<0.9；|f‑fw|<0.008；0.69<|R1+R2|/|R1‑R2|<1, the endoscope optical system of the utility model in human body with there is consistent optimal imaging object distance in air.
Description
【Technical field】
The utility model patent is related to a kind of medical instrument, particularly a kind of small-bore optical system for endoscope.
【Background technology】
With the fast development of science and technology, medical industry also achieves huge progress, checked using endoscope and
The gradual development of technology and the maturation of Minimally Invasive Surgery are carried out using endoscope.Endoscope can pass through human body as a kind of optical instrument
Natural channel enter diseased region is imaged in vivo, the lesion in internal organs can be observed directly.At present in major part
Sight glass bore is larger, and the process into human body is more painful, is also not easy to check the diseased region of channel relatively narrower；Separately
Outside, many endoscopes are also there are the smaller problem of the depth of field, can blur-free imaging object distance range it is very short, make the detection result of endoscope
It has a greatly reduced quality
Since there are the above problems, it is necessary to solution is proposed to it, the utility model is exactly in this context
It makes.
【Utility model content】
The technical problem to be solved by the utility model is to the deficiencies in for the above-mentioned prior art, provide one kind and are used for
The small-bore optical system of endoscope can narrow down to 2.0mm using the endoscope lens bore of this optical system, this means that
Can greatly mitigate patient inspection pain, while the utility model endoscope optical system can blur-free imaging object distance range
It for 5~60mm, can be applied in the lesion examining of large cavity, in addition, the endoscope optical system of the utility model is in human body
With in air have consistent optimal imaging object distance.
To achieve the above object, the utility model employs following technical proposals：
A kind of small-bore optical system for endoscope, including preceding group of G1 being made of the first lens 1, by three pieces eyeglass
The rear group of G2 formed, by the optical filter nearby organized, close to the fixed aperture and chip protective glass organized afterwards, wherein afterwards group include from
Object plane side is to tactic second lens 4 of image planes side, and 5 and the 4th lens 6 of third lens, the endoscope optical system is in air
During middle work, preceding group equivalent focal length is fb, and for rear equivalent focal length of organizing for fa, total equivalent focal length is f；The endoscope optical system
In human body during (following refer to each mean that there are in the human organ of tissue fluid or cavity " in human body ") work, total etc.
Effect focal length is fw；R1 is the object flank radius of the first lens, and R2 is the image side curvature radius of the first lens.The endoscope
Optical system meets following relationship：
1<|fb/f|<1.8 (1)
0.7<|fa/f|<0.9 (2)
|f-fw|<0.008 (3)
0.69<|R1+R2|/|R1-R2|<1 (4)
First lens 1 of above-mentioned endoscope optical system are negative lens, and image planes side is concave surface, and the second lens 4 is just thoroughly
Mirror, image planes side be convex surface, third lens 5 be positive lens, image planes side be convex surface, the 4th lens 6 be negative lens, object plane side
For concave surface；At least three pieces are plastic cement aspherical lens.
The bore of endoscope optical system is controlled while in order to realize wide angle, the first lens strength is negative, and
Image side surface is concave surface.
Medical endoscope generally carries out image quality evaluation and test in air environment in process of production, but practical service environment but exists
In human body, since refractive index of the object space under two media is different, lead to the aerial optical parameter of many endoscopes
There are larger differences with the optical parameter of actual working environment.It makes the object side of first lens of this endoscope optical system
Nick shape reduces influence of the object space medium refraction index difference to system total focal length, so as to ensure endoscope optical system in sky
Gas, which is neutralized in human body, a similar equivalent focal length, ensures that endoscope optical system is consistent with having in human body best in air
Object distance is imaged, ensures Deep Canvas consistent with having in human body in air.
, will not be excessively recessed because of the first lens object side when ensureing work by meeting relational expression (4), and lead to dirt
The first lens surface is converged in, image quality is unintelligible when causing the endoscope to work in human body.
Above-mentioned endoscope optical system makes full use of gap larger among the first lens and fixed aperture, and tablet is filtered
Piece IR is placed among the first lens and fixed aperture, effectively reduces the overall length of optical system；On the other hand, in the first lens and
Setting plate glass can effectively reduce the ray height of outer visual field among fixed aperture, be conducive to the small of endoscope optical system
Bore.
Above-mentioned endoscope optical system meets following relationship：
1<CTo/TTL<6 (5)
Wherein, CTo is the optimal imaging object distance of the optical system；TTL is the first lens described in endoscope optical system
Distance on object side to the axis of imaging surface.
For the object distance of above-mentioned endoscope optical system to be limited remote, it is near that (5) formula mainly balances above-mentioned endoscope optical system
The resolution ratio of scape and distant view, when the optimal imaging object distance of optical system is less than lower limit, the resolution ratio of distant view is deteriorated, and works as optical system
When the optimal imaging object distance of system is more than the upper limit, the resolution ratio of close shot is deteriorated.
Above-mentioned endoscope optical system meets following relationship：
30<|Vd3-Vd4|<50 (6)
Wherein, Vd3 is the Abbe number of the optical system third lens；Vd4 is the Abbe number of the 4th lens of optical system.
Ratio chromatism, is corrected by reasonably selecting the material of third lens and the 4th lens, when the Abbe of the two lens
When the difference of number is less than lower limit or more than the upper limit, ratio chromatism, is larger, and picture will appear colored smear.
Above-mentioned endoscope optical system meets following relationship：
1.5<TTL/ImgH<3.5 (7)
Wherein, TTL is distance on the object side to the axis of imaging surface of first lens of optical system；ImgH is optical system
Maximum image height.
When relational expression (7) is less than lower limiting value, it is difficult to limit bore while endoscope optical system image quality is ensured, work as pass
Be formula (7) more than the upper limit when, the overall length of endoscope optical system will be long, is also unfavorable for the miniaturization of endoscope.
Above-mentioned endoscope optical system meets following relationship when working in air：
0.5<T12/f<0.9 (8)
0.04<Tst2/f<0.06 (9)
0.4<T4i/f<1.2 (10)
Wherein, T12 is spacing distance on optical system the first lens image side surface and the axis of the second lens object side；Tst2
For distance on the axis of the optical system fixed aperture to the second lens object side；T4i is the image side of the 4th lens of optical system
Distance on face to the axis of image planes.
Formula (8) and (9) common equilibrium fixed aperture front-end geometry are conducive to correct the astigmatism of endoscope optical system and abnormal
Become, certain contribution in addition is also functioned to the correction of ratio chromatism,.Formula (10) is mainly to control the rear coke of endoscope optical system
Away from when T4i/f is less than lower limiting value, the focusing space of endoscope lens will be inadequate, when T4i/f is more than upper limit value, will cause
Entire optical system overall length is long.
Above-mentioned endoscope optical system meets following relationship：
0.11<CT1/∑CT<0.17 (11)
0.17<CT2/∑CT<0.3 (12)
0.18<CT3/∑CT<0.36 (13)
0.19<CT4/∑CT<0.41 (14)
Wherein, ∑ CT is the first lens of optical system, the second lens, third lens, the 4th lens respectively on optical axis
Thickness summation；CT1 is first lens of optical system in the thickness on optical axis, and CT2 is second lens of optical system in light
Thickness on axis, CT3 are the optical system third lens in the thickness on optical axis, and CT4 is the 4th lens of optical system in light
Thickness on axis.
In the case where CT1/ ∑s CT is lower limit, the central part of concavees lens is thinning, on the one hand the face in injection molding process
Precision can be poor, is on the other hand that the intensity of lens declines, impact resistant and does not fall；In the situation that CT1/ ∑s CT is the upper limit
Under, light height will increase, and aperture of lens will also become larger therewith.
(13) and (14) formula mainly corrects ratio chromatism, and axial chromatic aberration, and in addition the image side surface of third lens is convex surface,
The object side of the 4th lens is concave surface simultaneously, is conducive to inhibit the generation of endoscope optical system astigmatism and the correction of spherical aberration.
Above-mentioned endoscope optical system meets following relationship when working in air：
0.61<|f2/f|<1.03 (15)
0.82<|f3/f|<1.72 (16)
0.69<|f4/f|<1.2 (17)
Wherein, f2 is the equivalent focal length of second lens；F3 is the equivalent focal length of the third lens；F4 is the 4th lens
Equivalent focal length.
Second lens and third lens are positive lens, being capable of effective spherical aberration corrector and abnormal using the adjacent positive lens of two panels
Become, in addition the focal power of reasonable distribution third lens and the 4th lens can relatively easily correct endoscope optical system
Aberration on ratio chromatism, and axis.
Above-mentioned endoscope optical system meets following relationship：
35<FNO·ImgH/βw<102 (18)
45<FNO·ImgH/β<125 (19)
Wherein, FNO is the f-number of the optical system；β w are the vertical axis magnifying power that the optical system is placed in human body；β is
The optical system is placed in the vertical axis magnifying power in air.
When relational expression (18) and (19) are less than lower limiting value, the depth of field of endoscope optical system will be deteriorated, and work as relational expression
(18) when and (19) are more than upper limit value, the vertical enlargement of endoscope optical system will be less than normal, is unfavorable for sending out in use
Existing small lesion.
Above-mentioned endoscope optical system meets following relationship：
0.73<f·tan(ω/2)/ImgH<1.16 (20)
0.28<fw·tan(ωw/2)/ImgH<0.60 (21)
Wherein, ω is placed in the maximum field of view angle in air for the optical system；Fw is placed in human body always for the optical system
Equivalent focal length；ω w water is placed in the maximum field of view angle in human body for the optical system.
When relational expression (20) and (21) are less than lower limiting value, the wide angle of endoscope optical system will be unfavorable for, work as relationship
When formula (20) and (21) are more than upper limit value, the distortion of endoscope optical system is larger.
The beneficial effects of the utility model are：
1st, the endoscope optical system of the utility model, field angle is big, in four eyeglasses be more than three pieces be plastic lens, institute
It is relatively low with cost, disposable medical endoscope is can be widely applied to, the endoscope lens which is formed
Tolerance sensitivities are low, can use no step, and the simple metal lens barrel of no thread is assembled, and effectively reduces camera lens aperture,
The compatibility of camera lens is improved, in addition working focal distance variation of the endoscope optical system in air and human body is small, longer
Object distance range in can blur-free imaging.
【Description of the drawings】
Fig. 1 is a kind of integrally-built lens sectional view of the endoscope optical system of embodiment of the utility model.
Fig. 2 is the integrally-built lens sectional view of the endoscope optical system of the embodiment 1 of the utility model.
Fig. 3 is the aerial aberration curve figure of endoscope optical system of Fig. 2.
Fig. 4 is aberration curve figure of the endoscope optical system of Fig. 2 in human body.
Fig. 5 is the integrally-built lens sectional view of the endoscope optical system of the embodiment 2 of the utility model.
Fig. 6 is the aerial aberration curve figure of endoscope optical system of Fig. 5.
Fig. 7 is aberration curve figure of the endoscope optical system of Fig. 5 in human body.
Fig. 8 is the integrally-built lens sectional view of the endoscope optical system of the embodiment 3 of the utility model.
Fig. 9 is the aerial aberration curve figure of endoscope optical system of Fig. 8.
Figure 10 is aberration curve figure of the endoscope optical system of Fig. 8 in human body.
Figure 11 is the integrally-built lens sectional view of the endoscope optical system of the embodiment 4 of the utility model.
Figure 12 is the aerial aberration curve figure of endoscope optical system of Figure 11.
Figure 13 is the aberration curve figure of the endoscope optical system of Figure 11 in human body.
【Specific embodiment】
Further detailed description is done to the utility model below in conjunction with the accompanying drawings.
As shown in figure 1 to figure 13, a kind of small-bore optical system for endoscope is equipped with the successively by object plane to image planes
One lens 1, optical filter 2, the second lens 4, third lens 5, the 4th lens 6, grating 6, chip protective glass 7, described first thoroughly
Mirror 1 organizes G1 before forming optics, and second lens 4, third lens 5, the 4th lens 6 organize G2 after forming optics, endoscopic optical
When system works in air, the equivalent focal length that G1 is organized before optics is fb, G2 equivalent focal lengths is organized after optics as fa, endoscopic optical
The total equivalent focal length of system is f；When endoscope optical system works in human body, the total equivalent focal length of endoscope optical system is
fw；R1 is the object flank radius of first lens 1, and R2 is the image side curvature radius of first lens 1, endoscope
Optical system meets following relationship：
1<|fb/f|<1.8
0.7<|fa/f|<0.9
|f-fw|<0.008
0.69<|R1+R2|/|R1-R2|<1
According to the endoscope optical system that conditions above is formed, appropriate focal length point is given from the first lens to the 4th lens
Match, the small-bore optical system for endoscope that in human body and best object distance is consistent in air can be formed, and should
Endoscope optical system can blur-free imaging object distance range it is wide, the wosap tv system energy being made of the endoscope optical system
Enough take more lesion informations.The endoscope optical system of the utility model, field angle is big, is more than three pieces in four eyeglasses
For plastic lens, so cost is relatively low, disposable medical endoscope is can be widely applied to, which is formed
Endoscope lens tolerance sensitivities it is low, no step can be used, the simple metal lens barrel of no thread is assembled, effectively reduce
Camera lens aperture improves the compatibility of camera lens, and in addition the working focal distance of the endoscope optical system in air and human body becomes
Change small, the equal energy blur-free imaging in longer object distance range.
As shown in Figure 1 and Figure 2, in the present embodiment, first lens 1 are negative lens, and image planes side is concave surface, described
Second lens 4 are positive lens, and image planes side is convex surface, and the third lens 5 are positive lens, and image planes side is convex surface, described the
Four lens 6 are negative lens, and object plane side is concave surface, in first lens 1, the second lens 4, third lens 5, the 4th lens 6
At least three pieces are plastic cement aspherical lens.
As shown in Figure 1 and Figure 2, in the present embodiment, endoscope optical system meets following relationship：
1<CTo/TTL<6
Wherein, CTo is the object distance of endoscope optical system；TTL is the object side of the first lens described in endoscope optical system
Distance on face to the axis of imaging surface.
As shown in Figure 1 and Figure 2, in the present embodiment, endoscope optical system meets following relationship：
30<|Vd3-Vd4|<50
Wherein, Vd3 is the Abbe number of third lens 5 described in endoscope optical system；Vd4 is described in endoscope optical system
The Abbe number of 4th lens 6.
As shown in Figure 1 and Figure 2, in the present embodiment, endoscope optical system meets following relationship：
1.5<TTL/ImgH<3.5
Wherein, TTL is distance on the object side to the axis of imaging surface of the first lens 1 described in endoscope optical system；ImgH
Maximum image height for endoscope optical system.
As shown in Figure 1 and Figure 2, in the present embodiment, meet following relationship when endoscope optical system works in air
Formula：
0.5<T12/f<0.9
0.04<Tst2/f<0.06
0.4<T4i/f<1.2
Wherein, T12 is spacing distance on endoscope optical system the first lens image side surface and the axis of the second lens object side；
Tst2 is distance on endoscope optical system fixed aperture to the axis of the second lens object side；T4i is endoscope optical system the
Distance on the image side surface of four lens to the axis of image planes.
As shown in Figure 1 and Figure 2, in the present embodiment, endoscope optical system meets following relationship：
0.11<CT1/∑CT<0.17
0.17<CT2/∑CT<0.3
0.18<CT3/∑CT<0.36
0.19<CT4/∑CT<0.41
Wherein, ∑ CT is the first lens 1, the second lens 4, third lens 5, the 4th lens 6 described in endoscope optical system
Respectively at the thickness summation on optical axis；For the first lens 1 described in endoscope optical system, in the thickness on optical axis, CT2 is interior to CT1
Second lens 4 described in sight glass optical system are third lens 5 described in endoscope optical system in light in the thickness on optical axis, CT3
Thickness on axis, CT4 are the 4th lens 6 described in endoscope optical system in the thickness on optical axis.
As shown in Figure 1 and Figure 2, in the present embodiment, meet following relationship when endoscope optical system works in air
Formula：
0.61<|f2/f|<1.03
0.82<|f3/f|<1.72
0.69<|f4/f|<1.2
Wherein, f2 is the equivalent focal length of second lens 4；F3 is the equivalent focal length of the third lens 5；F4 is the institute
State the equivalent focal length of the 4th lens 6.
As shown in Figure 1 and Figure 2, in the present embodiment, endoscope optical system meets following relationship：
35<FNO·ImgH/βw<102
45<FNO·ImgH/β<125
Wherein, FNO is the f-number of endoscope optical system；β w are that the vertical axis that endoscope optical system is placed in human body is put
Big rate；β is the vertical axis magnifying power that endoscope optical system is placed in air.
As shown in Figure 1 and Figure 2, in the present embodiment, endoscope optical system meets following relationship：
0.73<f·tan(ω/2)/ImgH<1.16
0.28<fw·tan(ωw/2)/ImgH<0.60
Wherein, ω is placed in the maximum field of view angle in air for endoscope optical system；Fw is placed in for endoscope optical system
Total equivalent focal length in human body；ω w are placed in the maximum field of view angle in human body for endoscope optical system.
Illustrate four kinds of embodiments of the endoscope optical system referring to Fig. 2~Figure 13, it is corresponding in each embodiment
In mirror tables of data, the unit of radius and thickness is mm, institute's reference aberration curve figure reference wavelength for 656nm, 587nm,
486nm, wherein the aberration curve figure left side are axial spherical aberration figure, and intermediate for astigmatism figure, the right is distortion figure, and astigmatism figure
In S (solid line) and T (dotted line) represent sagittal image surface and meridianal image surface respectively.
Embodiment 1：
By the representation of the endoscope optical system of the embodiment 1 of the utility model in fig. 2, by the utility model
The aerial aberration curve of endoscope optical system of embodiment 1 represents that in figure 3 the aberration curve in human body represents
In Fig. 4.
Table 1 is the lens data table of endoscope optical system embodiment 1.
Table 1
Table 2 is each aspherical rise of 1 first lens 1 of endoscope optical system embodiment and the second lens 4 with radius R's
Ratio range.
Table 2
Table 3 is each aspherical rise of 1 third lens 5 of endoscope optical system embodiment and the 4th lens 6 with radius R's
Ratio range.
Table 3
Embodiment 2：
By the representation of the endoscope optical system of the embodiment 2 of the utility model in Figure 5, by the utility model
The aerial aberration curve of endoscope optical system of embodiment 2 represents that in figure 6 the aberration curve in human body represents
In Fig. 7.
Table 4 is the lens data table of endoscope optical system embodiment 2.
Table 4
Table 5 is each aspherical rise of 2 first lens 1 of endoscope optical system embodiment and the second lens 4 with radius R's
Ratio range.
Table 5
Table 6 is each aspherical rise of 2 third lens 5 of endoscope optical system embodiment and the 4th lens 6 with radius R's
Ratio range.
Table 6
Embodiment 3：
By the representation of the endoscope optical system of the embodiment 3 of the utility model in fig. 8, by the utility model
The aerial aberration curve of endoscope optical system of embodiment 3 represents that in fig.9 the aberration curve in human body represents
In Figure 10.
Table 7 is the lens data table of endoscope optical system embodiment 3.
Table 7
Table 8 is each aspherical rise of 3 first lens 1 of endoscope optical system embodiment and the second lens 4 with radius R's
Ratio range.
Table 8
Table 9 is each aspherical rise of 3 third lens 5 of endoscope optical system embodiment and the 4th lens 6 with radius R's
Ratio range.
Table 9
Embodiment 4：
By the representation of the endoscope optical system of the embodiment 4 of the utility model in fig. 11, by the utility model
The aerial aberration curve of endoscope optical system of embodiment 4 represent in fig. 12, the aberration curve table in human body
Show in fig. 13.
Table 10 is the lens data table of endoscope optical system embodiment 4.
Table 10
Table 11 is each aspherical rise of 4 first lens 1 of endoscope optical system embodiment and the second lens 4 and radius R
Ratio range.
Table 11
Table 12 is 4 third lens 5 of endoscope optical system embodiment and each aspherical rise height and radius of the 4th lens 6
The ratio range of R.
Table 12
Claims (10)
1. a kind of small-bore optical system for endoscope, it is characterised in that：First lens are equipped with by object plane to image planes successively
(1), optical filter (2), fixed aperture (3), the second lens (4), third lens (5), the 4th lens (6), chip protective glass
(7), first lens (1) organize G1 before forming optics, and second lens (4), third lens (5), the 4th lens (6) are formed
G2 is organized after optics, when endoscope optical system works in air, the equivalent focal length that G1 is organized before optics is fb, and G2 etc. is organized after optics
Effect focal length is fa, and the total equivalent focal length of endoscope optical system is f；When endoscope optical system works in human body, endoscope
The total equivalent focal length of optical system is fw；R1 is the object flank radius of first lens (1), and R2 is first lens
(1) image side curvature radius, endoscope optical system meet following relationship：
1<|fb/f|<1.8
0.7<|fa/f|<0.9
|f-fw|<0.008
0.69<|R1+R2|/|R1-R2|<1。
2. the small-bore optical system according to claim 1 for endoscope, it is characterised in that：First lens
(1) it is negative lens, image planes side is concave surface, and second lens (4) are positive lens, and image planes side is convex surface, and the third is saturating
Mirror (5) be positive lens, image planes side be convex surface, the 4th lens (6) be negative lens, object plane side be concave surface, described first
At least three pieces are plastic cement aspherical lens in lens (1), the second lens (4), third lens (5), the 4th lens (6).
3. the small-bore optical system according to claim 1 or 2 for endoscope, it is characterised in that：Endoscopic optical
System meets following relationship：
1<CTo/TTL<6
Wherein, CTo is the object distance of endoscope optical system；TTL is the object side of the first lens (1) described in endoscope optical system
Distance on to the axis of imaging surface.
4. the small-bore optical system according to claim 1 or 2 for endoscope, it is characterised in that：Endoscopic optical
System meets following relationship：
30<|Vd3-Vd4|<50
Wherein, Vd3 is the Abbe number of third lens (5) described in endoscope optical system；Vd4 is described in endoscope optical system the
The Abbe number of four lens (6).
5. the small-bore optical system according to claim 1 or 2 for endoscope, it is characterised in that：Endoscopic optical
System meets following relationship：
1.5<TTL/ImgH<3.5
Wherein, TTL is distance on the object side to the axis of imaging surface of the first lens (1) described in endoscope optical system；ImgH is
The maximum image height of endoscope optical system.
6. the small-bore optical system according to claim 1 or 2 for endoscope, it is characterised in that：Endoscopic optical
Meet following relationship when system works in air：
0.5<T12/f<0.9
0.04<Tst2/f<0.06
0.4<T4i/f<1.2
Wherein, T12 is spacer on the first lens of endoscope optical system (1) image side surface and the axis of the second lens (4) object side
From；Tst2 is distance on endoscope optical system fixed aperture (3) to the axis of the second lens (4) object side；T4i is endoscope light
Distance on the image side surface to the axis of image planes of the 4th lens (6) of system.
7. the small-bore optical system according to claim 1 or 2 for endoscope, it is characterised in that：Endoscopic optical
System meets following relationship：
0.11<CT1/∑CT<0.17
0.17<CT2/∑CT<0.3
0.18<CT3/∑CT<0.36
0.19<CT4/∑CT<0.41
Wherein, ∑ CT is the first lens (1), the second lens (4), third lens (5), the 4th lens described in endoscope optical system
(6) respectively at the thickness summation on optical axis；CT1 is the first lens (1) described in endoscope optical system in the thickness on optical axis,
CT2 is the second lens (4) described in endoscope optical system in the thickness on optical axis, and CT3 is third described in endoscope optical system
Lens (5) are the 4th lens (6) described in endoscope optical system in the thickness on optical axis in the thickness on optical axis, CT4.
8. the small-bore optical system according to claim 1 or 2 for endoscope, it is characterised in that：Endoscopic optical
Meet following relationship when system works in air：
0.61<|f2/f|<1.03
0.82<|f3/f|<1.72
0.69<|f4/f|<1.2
Wherein, f2 is the equivalent focal length of second lens (4)；F3 is the equivalent focal length of the third lens (5)；F4 is the institute
State the equivalent focal length of the 4th lens (6).
9. the small-bore optical system according to claim 1 or 2 for endoscope, it is characterised in that：Endoscopic optical
System meets following relationship：
35<FNO·ImgH/βw<102
45<FNO·ImgH/β<125
Wherein, FNO is the f-number of endoscope optical system；β w are the vertical axis amplification that endoscope optical system is placed in human body
Rate；β is the vertical axis magnifying power that endoscope optical system is placed in air.
10. the small-bore optical system according to claim 1 or 2 for endoscope, it is characterised in that：Endoscopic optical
System meets following relationship：
0.73<f·tan(ω/2)/ImgH<1.16
0.28<fw·tan(ωw/2)/ImgH<0.60
Wherein, ω is placed in the maximum field of view angle in air for endoscope optical system；Fw is placed in human body for endoscope optical system
Interior total equivalent focal length；ω w are placed in the maximum field of view angle in human body for endoscope optical system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107874733A (en) * | 2017-12-04 | 2018-04-06 | 中山市众盈光学有限公司 | A kind of small-bore endoscope optical system |
| US11415792B2 (en) * | 2018-06-27 | 2022-08-16 | Altek Biotechnology Corporation | Wide-angle endoscope lens |
-
2017
- 2017-12-04 CN CN201721683882.1U patent/CN207473186U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107874733A (en) * | 2017-12-04 | 2018-04-06 | 中山市众盈光学有限公司 | A kind of small-bore endoscope optical system |
| CN107874733B (en) * | 2017-12-04 | 2024-03-22 | 中山市众盈光学有限公司 | Small-caliber endoscope optical system |
| US11415792B2 (en) * | 2018-06-27 | 2022-08-16 | Altek Biotechnology Corporation | Wide-angle endoscope lens |
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