CN208569164U - The camera lens of capsule endoscope - Google Patents
The camera lens of capsule endoscope Download PDFInfo
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- CN208569164U CN208569164U CN201821257304.6U CN201821257304U CN208569164U CN 208569164 U CN208569164 U CN 208569164U CN 201821257304 U CN201821257304 U CN 201821257304U CN 208569164 U CN208569164 U CN 208569164U
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Abstract
The utility model relates to technical field of optical, the third lens being positive more particularly to a kind of camera lens of capsule endoscope, the first lens group being positive including hemispherical cover, focal length, diaphragm, focal length and chip protect glass；Hemispherical cover has negative power, near axis area is concave surface close to image side surface, above-mentioned two face is all spherical surface wherein near axis area be convex surface close to object side；First lens group is made of the second lens that the first lens that focal length is negative are positive with focal length；In the present solution, the setting of diaphragm can effectively be increased to the field angle of camera lens；Entire endoscope profile is similar with capsule, convenient for checking that body person is oral；Under the premise of meeting the shape requirements of hemispherical cover, reduces the camera lens entire length and control the size of distortion；Have the advantages that big field angle is small-bore, when work the areas imaging of single picture it is wider, can disposably take more human body informations.
Description
Technical field
The utility model relates to technical field of optical, more particularly to a kind of camera lens of capsule endoscope.
Background technique
With the development of science and technology endoscopic technique has also obtained quick development, the appearance of capsule endoscope is excellent well
Experience when doctors and patients check body lesion is changed, and its patient and the elderly more serious to the state of an illness are very friendly, due to it
The oral characteristic checked, capsule endoscope are especially suitable for the inspection of alimentary canal related disease；But there is also sizes for capsule endoscope
Bigger than normal, imaging picture illumination is partially dark, distorts the problems such as bigger than normal.
Utility model content
Based on this, it is necessary in view of the above technical problems, provide a kind of reduction hemispherical cover and imaging illumination can be increased
Capsule endoscope camera lens, distance is smaller on the camera lens hemispherical cover to the axis of object lens, can effectively reduce the ruler of endoscope
It is very little；The relative aperture of the camera lens is also smaller simultaneously, can significantly increase imaging illumination.
A kind of camera lens of capsule endoscope, the first lens group being positive including hemispherical cover, focal length, diaphragm, focal length are positive
The third lens and chip protect glass；Hemispherical cover has negative power, wherein near axis area be convex surface close to object side,
Close image side surface is concave surface near axis area, and above-mentioned two face is all spherical surface；The first lens that first lens group is negative by focal length
The second lens being positive with focal length are constituted；The camera lens meets following relationship:
Rb<L<Ra
1<f1/f<12.2
1<f3/f<1.75
0.89<|R31+R32|/|R31-R32|<1
Wherein, Ra is radius of curvature of the hemispherical cover close to object side, and Rb is curvature half of the hemispherical cover close to image side surface
Diameter, L are distance of the vertex to the first lens close to object side peak from hemispherical cover close to object side, f1, f3 and f difference
It is the focal length of the first lens group, the third lens and entire camera lens, R31 and R32 are the third lens object side and image side surface respectively
Radius of curvature.
The image planes side of the first lens is concave surface in one of the embodiments,；The object plane side of second lens is convex surface；Third
Lens image planes side is convex surface, and three pieces lens are plastic cement aspherical lens.
The camera lens meets following relationship in one of the embodiments:
0.2<Lu/TTL<0.5
Wherein, Lu is the object distance of the camera lens, and TTL is distance on the object side to the axis of imaging surface of first lens of camera lens.
The camera lens meets following relationship in one of the embodiments:
20<|Vd1-Vd2|<40
Wherein, Vd1 is the Abbe number of the first lens, and Vd2 is the Abbe number of the second lens.
The camera lens meets following relationship in one of the embodiments:
7.5<TTL/ImgH<8.5
Wherein, TTL is distance on the object side to the axis of imaging surface of first lens of camera lens, and ImgH is the maximum picture of camera lens
It is high.
Meet following relationship when the camera lens works in air in one of the embodiments:
5.5<Tb1/f<6.5
0.4<T12/f<0.5
0.01<T2s/f<0.04
1.4<T3i/f<2.0
Wherein, Tb1 is distance on hemispherical cover image side surface to the axis of the first lens object side, and T12 is the first lens image side
Distance on face to the axis of the second lens object side, T2s are distance on the second lens image side surface to the axis of diaphragm, and T3i is that third is saturating
Distance on the image side surface of mirror to the axis of image planes, f are the focal length of entire camera lens.
The camera lens meets following relationship in one of the embodiments:
0.21<CTb/∑CT<0.27
0.10<CT1/∑CT<0.31
0.22<CT2/∑CT<0.42
0.23<CT3/∑CT<0.43
Wherein, ∑ CT is the first lens to the third lens respectively at the thickness summation on optical axis, and CTb is that hemispherical covers in light
Thickness on axis, CT1 are the first lens in the thickness on optical axis, and CT2 is the second lens in the thickness on optical axis, and CT3 is third
Lens are in the thickness on optical axis.,
The camera lens meets following relationship in one of the embodiments:
38<FNO·ImgH/β<88
Wherein, FNO is the f-number of the camera lens, and ImgH is the maximum image height of the camera lens, and β is that the vertical axis of the camera lens amplifies
Rate.
The camera lens meets following relationship in one of the embodiments:
1.7<f·tan(ω/2)/ImgH<4.5
Wherein, f is the focal length of entire camera lens, and ω is that the camera lens is placed in the maximum field of view angle in air, and ImgH is the camera lens
Maximum image height.
Compared with prior art, the camera lens of the capsule endoscope of the utility model, hemispherical cover and three pieces of eyeglasses are all
Plastic cement material, it is at low cost and suitable for mass production；This camera lens is obviously increased compared to previous capsule endoscope imaging illumination, and distortion is big
Small also to have obtained preferable control, field angle size is also improved, so that camera lens can examination scope increase when using.
Detailed description of the invention
Fig. 1 is the integrally-built lens sectional view of camera lens in the utility model one embodiment；
Fig. 2 is the aberration curve figure of camera lens in the utility model one embodiment；
Fig. 3 is the distortion figure of camera lens in the utility model one embodiment；
Fig. 4 is the point range figure of camera lens in the utility model one embodiment.
Specific embodiment
Specific embodiment of the present utility model is further elaborated below in conjunction with Fig. 1 to Fig. 4:
A kind of camera lens of capsule endoscope, the first lens group G1, the diaphragm ST, coke being positive including hemispherical cover PH, focal length
Glass CG is protected away from the third lens L3 being positive and chip；Hemispherical cover PH has negative power, wherein close to object side close
Axis region is convex surface, and close image side surface is concave surface near axis area, and above-mentioned two face is all spherical surface；First lens group G1 is by focal length
The second lens L2 that the first lens L1 and focal length being negative are positive is constituted；The camera lens meets following relationship:
Rb<L<Ra
1<f1/f<12.2
1<f3/f<1.75
0.89<|R31+R32|/|R31-R32|<1
Wherein, Ra is radius of curvature of the hemispherical cover PH close to object side, and Rb is song of the hemispherical cover PH close to image side surface
Rate radius, L are distance of the vertex to the first lens L1 close to object side peak from hemispherical cover PH close to object side, f1, f3
And f is the focal length of the first lens group G1, the third lens L3 and entire camera lens respectively, R31 and R32 are the third lens L3 respectively
The radius of curvature of object side and image side surface.
In the present solution, diaphragm ST, which is fixed to, can effectively increase camera lens between the second lens L2 and the third lens L3
Field angle；Hemispherical cover PH object side is convex surface, keeps entire endoscope profile similar with capsule, convenient for checking body person mouthful
Clothes；By limiting Rb < L < Ra, the camera lens entire length can be reduced simultaneously under the premise of meeting the shape requirements of hemispherical cover PH
Control the size of distortion；By limiting the radius of curvature and focal length of hemispherical cover PH and three lens, one big view is constituted
The small-bore camera lens in rink corner, when work the areas imaging of single picture it is wider, can disposably take more human body informations.
The image planes side of the first lens L1 is concave surface in one of the embodiments,；The object plane side of second lens L2 is convex surface；
The third lens L3 image planes side is convex surface, and three pieces lens are plastic cement aspherical lens.
In the present embodiment, the first lens L1 image side surface is concave surface, and the second lens L2 object side is convex surface, can be effectively reduced
The overall length of camera lens.
The camera lens meets following relationship in one of the embodiments:
0.2<Lu/TTL<0.5
Wherein, Lu be the camera lens object distance, TTL be first lens of camera lens L1 object side to the axis of imaging surface on away from
From.
Capsule endoscope is mainly used for observing body foci, therefore it is required that working distance value is less than normal；In the present embodiment, meet
The camera lens of the capsule endoscope of the relational expression has preferable balanced capacity to the resolution ratio of close shot and distant view；As the Lu/ of camera lens
When TTL is lower than lower limit 0.2, the resolution ratio of distant view is deteriorated, and when the Lu/TTL of camera lens is more than the upper limit 0.5, the resolution ratio of close shot becomes
Difference.
The camera lens meets following relationship in one of the embodiments:
20<|Vd1-Vd2|<40
Wherein, Vd1 is the Abbe number of the first lens L1, and Vd2 is the Abbe number of the second lens L2.
In the present embodiment, the range of lens material can be constrained by the relational expression, and optimizes the multiplying power color of camera lens with this
Difference.
The camera lens meets following relationship in one of the embodiments:
7.5<TTL/ImgH<8.5
Wherein, TTL is distance on the object side to the axis of imaging surface of first lens of camera lens L1, and ImgH is the maximum of camera lens
Image height.
In the present embodiment, by the relational expression can balanced camera lens overall length and whole image quality, by the ratio between TTL and ImgH
Value is limited between 7.5 and 8.5, can limit the overall length of camera lens, meets the miniature requirement of endoscope, and can be by the picture of camera lens
Matter constrains within the scope of ideal volume.
Meet following relationship when the camera lens works in air in one of the embodiments:
5.5<Tb1/f<6.5
0.4<T12/f<0.5
0.01<T2s/f<0.04
1.4<T3i/f<2.0
Wherein, Tb1 is distance on hemispherical cover PH image side surface to the axis of the first lens L1 object side, and T12 is the first lens
Distance on L1 image side surface to the axis of the second lens L2 object side, T2s are distance on the second lens L2 image side surface to the axis of diaphragm ST,
T3i is distance on the image side surface to the axis of image planes of the third lens L3, and f is the focal length of entire camera lens.
In the present embodiment, restricted T b1/f can constrain the length of entire camera lens in the range of 5.5~6.5, so that the glue
The camera lens of intracapsular sight glass satisfies the use demand；Restricted T 12/f can constrain the field angle of camera lens and abnormal in the range of 0.4~0.5
Become, be difficult to meet the requirement for designing big visual field if T12/f is lower than 0.4, can to distort if T12/f is higher than 0.5
Greatly；Restricted T 3i/f can limit field angle, distortion and the curvature of field of endoscope lens in the range of 1.4~2.0, when T3i/f is low
The distortion of camera lens and the curvature of field can be bigger than normal when 1.4, T3i/f be higher than 2.0 be camera lens field angle it is less than normal.
The camera lens meets following relationship in one of the embodiments:
0.21<CTb/∑CT<0.27
0.10<CT1/∑CT<0.31
0.22<CT2/∑CT<0.42
0.23<CT3/∑CT<0.43
Wherein, ∑ CT is the first lens L1 to the third lens L3 respectively at the thickness summation on optical axis, and CTb is hemispherical cover
For PH in the thickness on optical axis, CT1 is the first lens L1 in the thickness on optical axis, and CT2 is the second lens L2 in the thickness on optical axis,
CT3 is the third lens L3 in the thickness on optical axis.
In the present embodiment, bore and the distortion of camera lens can be constrained by limiting the range of CTb/ ∑ CT, CTb/ ∑ CT is low
When 0.21, the distortion of camera lens can be bigger than normal, while molding processing difficulty is higher, the bore meeting of camera lens when CTb/ ∑ CT is higher than 0.27
It is bigger than normal.
The camera lens meets following relationship in one of the embodiments:
38<FNO·ImgH/β<88
Wherein, FNO is the f-number of the camera lens, and ImgH is the maximum image height of the camera lens, and β is that the vertical axis of the camera lens amplifies
Rate.
In the present embodiment, which can limit the depth of field, illumination and magnifying power of camera lens, when FNOImgH/ β is lower than
When 38, the depth of field of endoscope will be deteriorated, and when FNOImgH/ β is more than 88, the vertical enlargement of endoscope will be less than normal, will affect
The resolution ratio of camera lens entirety, and camera lens illumination can also decline.
The camera lens meets following relationship in one of the embodiments:
1.7<f·tan(ω/2)/ImgH<4.5
Wherein, f is the focal length of entire camera lens, and ω is that the camera lens is placed in the maximum field of view angle in air, and ImgH is the camera lens
Maximum image height.
It as shown in table 1, is the tool of camera lens each lens design in one embodiment of the utility model capsule endoscope
Body parameter list:
| Serial number | Surface type | Radius (mm) | Thickness (mm) | Refractive index | Abbe number |
| Object plane | Spherical surface | ∞ | 4 | ||
| S1 | Spherical surface | 5.9 | 0.7 | 1.59 | 30 |
| S2 | Spherical surface | 5.2 | 4.533 | ||
| S3 | It is aspherical | -14.11274587 | 0.5 | 1.53 | 56 |
| S4 | It is aspherical | 0.4653402484 | 0.3373808582 | ||
| S5 | It is aspherical | 0.6946308368 | 0.9379858723 | 1.63 | 24 |
| S6 | It is aspherical | 4.0389505303 | 0.0162602887 | ||
| S7 diaphragm face | Spherical surface | ∞ | 0.1541156059 | ||
| S8 | It is aspherical | 18.616216725 | 0.8122599606 | 1.54 | 56 |
| S9 | It is aspherical | -0.547501505 | 0.8245 | ||
| S10 | Spherical surface | ∞ | 0.4 | 1.52 | 64 |
| S11 | Spherical surface | ∞ | 0.0349765203 | ||
| IMG image planes | Spherical surface | ∞ | 0 |
Table 1
It as shown in table 2, is each aspherical rise of the first lens L1 and the second lens L2 in one embodiment and half
The ratio range of diameter R:
Table 2
It as shown in table 3, is the ratio model of each aspherical rise of the third lens L3 and radius R in one embodiment
It encloses:
Table 3
Reference wavelength in Figure of description is 656nm, 587nm, 486nm, solid line S in the aberration curve figure of Fig. 2 and
Dotted line T respectively represents sagittal image surface and meridianal image surface.
Claims (9)
1. a kind of camera lens of capsule endoscope, it is characterised in that: the first lens group being positive including hemispherical cover (PH), focal length
(G1), the third lens (L3) and chip that diaphragm (ST), focal length are positive protect glass (CG)；Hemispherical cover (PH) has negative light focus
Degree near axis area is concave surface close to image side surface, above-mentioned two face is all ball wherein near axis area be convex surface close to object side
Face；The second lens (L2) that the first lens (L1) that first lens group (G1) is negative by focal length are positive with focal length are constituted；The camera lens
Meet following relationship:
Rb<L<Ra
1<f1/f<12.2
1<f3/f<1.75
0.89<|R31+R32|/|R31-R32|<1
Wherein, Ra is the radius of curvature of hemispherical cover (PH) close to object side, and Rb is the song of hemispherical cover (PH) close to image side surface
Rate radius, L be from hemispherical cover (PH) close to object side vertex to the first lens (L1) close to object side peak distance,
F1, f3 and f are the focal length of the first lens group (G1), the third lens (L3) and entire camera lens respectively, and R31 and R32 are respectively
The radius of curvature of the third lens (L3) object side and image side surface.
2. the camera lens of capsule endoscope according to claim 1, it is characterised in that: the image planes side of the first lens (L1) is recessed
Face；The object plane side of second lens (L2) is convex surface；The image planes side of the third lens (L3) is convex surface, and three pieces lens are plastic cement aspheric
Face eyeglass.
3. the camera lens of capsule endoscope according to claim 1, it is characterised in that: the camera lens meets following relationship:
0.2<Lu/TTL<0.5
Wherein, Lu is the object distance of the camera lens, and TTL is distance on the object side to the axis of imaging surface of first lens of camera lens (L1).
4. the camera lens of capsule endoscope according to claim 1, it is characterised in that: the camera lens meets following relationship:
20<|Vd1-Vd2|<40
Wherein, Vd1 is the Abbe number of the first lens (L1), and Vd2 is the Abbe number of the second lens (L2).
5. the camera lens of capsule endoscope according to claim 1, it is characterised in that: the camera lens meets following relationship:
7.5<TTL/ImgH<8.5
Wherein, TTL is distance on the object side to the axis of imaging surface of first lens of camera lens (L1), and ImgH is the maximum picture of camera lens
It is high.
6. the camera lens of capsule endoscope according to claim 1, it is characterised in that: the satisfaction when camera lens works in air
Following relationship:
5.5<Tb1/f<6.5
0.4<T12/f<0.5
0.01<T2s/f<0.04
1.4<T3i/f<2.0
Wherein, Tb1 is distance on hemispherical cover (PH) image side surface to the axis of the first lens (L1) object side, and T12 is the first lens
(L1) distance on image side surface to the axis of the second lens (L2) object side, T2s are the second lens (L2) image side surface to diaphragm (ST)
Distance on axis, T3i are distance on the image side surface to the axis of image planes of the third lens (L3), and f is the focal length of entire camera lens.
7. the camera lens of capsule endoscope according to claim 1, it is characterised in that: the camera lens meets following relationship:
0.21<CTb/∑CT<0.27
0.10<CT1/∑CT<0.31
0.22<CT2/∑CT<0.42
0.23<CT3/∑CT<0.43
Wherein, ∑ CT is the first lens (L1) to the third lens (L3) respectively at the thickness summation on optical axis, and CTb is hemispherical cover
(PH) in the thickness on optical axis, CT1 is the first lens (L1) in the thickness on optical axis, and CT2 is the second lens (L2) on optical axis
Thickness, CT3 be the third lens (L3) in the thickness on optical axis.
8. the camera lens of capsule endoscope according to claim 1, it is characterised in that: the camera lens meets following relationship:
38<FNO·ImgH/β<88
Wherein, FNO is the f-number of the camera lens, and ImgH is the maximum image height of the camera lens, and β is the vertical axis magnifying power of the camera lens.
9. the camera lens of capsule endoscope according to claim 1, it is characterised in that: the camera lens meets following relationship:
1.7<f·tan(ω/2)/ImgH<4.5
Wherein, f is the focal length of entire camera lens, and ω is that the camera lens is placed in the maximum field of view angle in air, ImgH be the camera lens most
Big image height.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821257304.6U CN208569164U (en) | 2018-08-06 | 2018-08-06 | The camera lens of capsule endoscope |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821257304.6U CN208569164U (en) | 2018-08-06 | 2018-08-06 | The camera lens of capsule endoscope |
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| Publication Number | Publication Date |
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| CN208569164U true CN208569164U (en) | 2019-03-01 |
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ID=65450219
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108873264A (en) * | 2018-08-06 | 2018-11-23 | 中山市众盈光学有限公司 | The optical system of capsule endoscope |
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2018
- 2018-08-06 CN CN201821257304.6U patent/CN208569164U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108873264A (en) * | 2018-08-06 | 2018-11-23 | 中山市众盈光学有限公司 | The optical system of capsule endoscope |
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