CN208654438U - A kind of new endoscopic optical system - Google Patents
A kind of new endoscopic optical system Download PDFInfo
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- CN208654438U CN208654438U CN201821255504.8U CN201821255504U CN208654438U CN 208654438 U CN208654438 U CN 208654438U CN 201821255504 U CN201821255504 U CN 201821255504U CN 208654438 U CN208654438 U CN 208654438U
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- 201000009310 astigmatism Diseases 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
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Abstract
The utility model discloses a kind of new endoscopic optical systems; the main points of its technical scheme are that successively including optical filter, diaphragm, the first lens of positive focal length, the second lens of negative focal length, chip protection glass from object side to image side; first lens image side surface is convex surface, and the second lens object side is concave surface；First lens and second lens are plastic cement aspherical lens.Endoscope optical system provided by the utility model, two panels eyeglass are all plastic cement materials, at low cost and suitable for mass production；This optical system is all smaller compared to previous endoscope overall length and bore, can be very good the size requirements for meeting current endoscope, meets the trend of current endoscope miniaturization.
Description
[technical field]
The utility model relates to a kind of endoscope optical systems, more particularly, to a kind of new endoscopic optical system.
[background technique]
With scientific and technological progress, the small form factor requirements of endoscope are higher and higher, the smaller endoscope ability of bore smaller szie
More meets the needs of market, but endoscope small in size generally means that the sacrifice of image quality, including operating distance, imaging
Height and illumination etc.；Therefore a research direction of current endoscope is exactly to guarantee optical system imaging quality as far as possible
Under the conditions of, the bore and volume of small endoscope are done as far as possible.
The utility model is namely based on what such case was made.
[utility model content]
The utility model aim is to overcome the deficiencies in the prior art, provides a kind of capsule endoscope, not only mouth
Diameter very little, maximum caliber are less than 1.3mm, and the entire length very little of optical system, are less than 2.5mm；The optical system volume
Small advantage it is obvious that and its can also have good image quality in certain field depth.
The utility model is achieved through the following technical solutions:
A kind of new endoscopic optical system, it is characterised in that successively include from object side to image side optical filter IR, diaphragm ST,
First lens L1 of positive focal length, the second lens L2 of negative focal length, chip protect glass CG, which meets following condition
Formula:
0.5<f1/f<1.2；
1<f2/f<1.75；
0.92<|R11+R12|/|R11-R12|<1；
Wherein, f1, f2 and f are the focal length of the first lens L1, the second lens L2 and whole system, R11 and R12 respectively
It is the radius of curvature of the first lens object side S4 and the first lens image side surface S5 respectively.
New endoscopic optical system as described above, it is characterised in that: the first lens image side surface S5 is convex surface, and second thoroughly
Mirror object side S6 is concave surface；The first lens L1 and the second lens L2 is plastic cement aspherical lens.
New endoscopic optical system as described above, it is characterised in that the optical system meets following conditional:
2.8<Lu/TTL<3.5；Wherein, Lu is the object distance of the optical system, and TTL is the optical system optical filter object side
Distance on to the axis of imaging surface S10.
New endoscopic optical system as described above, it is characterised in that the optical system meets following conditional: 20 < |
Vd1-Vd2 | < 40, wherein Vd1 is the Abbe number of the first lens L1；Vd2 is the Abbe number of the second lens L2.
New endoscopic optical system as described above, it is characterised in that the optical system meets following conditional: 2.9 <
TTL/ImgH < 3.6, wherein ImgH is the maximum image height of the optical system.
New endoscopic optical system as described above, it is characterised in that the optical system meets following conditional:
0.3<Ts1/f<0.4
0.03<T12/f<0.05
0.6<T2i/f<0.8；
Wherein, Ts1 is distance on the axis of optical filter image side surface S2 to the first lens object side S4, and T12 is the first lens picture
Distance on the axis of side S5 and the second lens object side S6；T2i is distance on the axis of the second lens image side surface S7 to image planes S10.
New endoscopic optical system as described above, it is characterised in that the optical system meets following conditional:
0.11<CTs/∑CT<0.20
0.36<CT1/∑CT<0.44
0.38<CT2/∑CT<0.44
Wherein, ∑ CT is optical system optical filter IR, the second lens L2 respectively at the thickness summation on optical axis；CTs is
The optical system hemispherical covers in the thickness on optical axis, and CT1 is the optical system the first lens L1 in the thickness on optical axis, CT2
It is the optical system the second lens L2 in the thickness on optical axis.
New endoscopic optical system as described above, it is characterised in that the optical system meets following conditional: 26 <
β < 56 FNOImgH/, wherein FNO is the f-number of the optical system；β is the vertical axis magnifying power of the optical system.
New endoscopic optical system as described above, it is characterised in that the optical system meets following conditional: 1.9 <
Ftan (ω/2)/ImgH < 3.5, wherein ω is that the optical system is placed in the maximum field of view angle in air.
Compared with prior art, the utility model has the following advantages:
1, endoscope optical system provided by the utility model, two panels eyeglass are all plastic cement materials, at low cost and suitable batch
Amount production；This optical system is all smaller compared to previous endoscope overall length and bore, can be very good the ruler for meeting current endoscope
Very little demand meets the trend of current endoscope miniaturization.
[Detailed description of the invention]
Fig. 1 is the utility model endoscope optical system structural plan figure.
Fig. 2 is the aberration curve figure of the utility model endoscope optical system.
Fig. 3 is the distortion figure of the utility model endoscope optical system.
[specific embodiment]
The utility model technical characteristic is described in further detail in order to the field technology people with reference to the accompanying drawing
Member understands.
A kind of new endoscopic optical system, successively include from object side to image side optical filter IR, diaphragm ST, positive focal length
One lens L1, the second lens L2 of negative focal length, chip protect glass CG, which meets following conditional:
0.5<f1/f<1.2；(1)
1<f2/f<1.75；(2)
0.92<|R11+R12|/|R11-R12|<1；(3)
Wherein, f1, f2 and f are the focal length of the first lens L1, the second lens L2 and whole system, R11 and R12 respectively
It is the radius of curvature of the first lens object side S4 and the first lens image side surface S5 respectively.
When the optical system works, light is reflected by optical filter before this, by aperture diaphragm, is then passing sequentially through the
One lens L1 is assembled and the second lens L2 diverging is imaged in certain chip.
New endoscopic optical system as described above, the first lens image side surface S5 are convex surface, the second lens object side S6
For concave surface；The first lens L1 and the second lens L2 is plastic cement aspherical lens.
Formula (1) (2) (3) is used to constrain the focal length and radius of curvature of eyeglass, controls the bending degree of lens, light can be constrained
The overall length and bore of system；Optical filter position can make diaphragm IR, the first lens L1 and the second lens L2 before diaphragm
Between axis on distance it is more compact, the first lens image side surface S5 be convex surface, the second lens object side S6 be concave surface, effectively subtract
The small overall length of optical system；
New endoscopic optical system as described above, the optical system meet following conditional: 2.8 < Lu/TTL < 3.5；
(4)
Wherein, Lu is the object distance of the optical system, and TTL is the optical system optical filter object side S1 to imaging surface S10's
Distance on axis.
New endoscopic optical system as described above, the optical system meet following conditional: 20 < | Vd1-Vd2 | <
40；(5)
Wherein, Vd1 is the Abbe number of the first lens L1；Vd2 is the Abbe number of the second lens L2.
Formula (5) can be used to the range of constrained lens material, and optimize the ratio chromatism, of optical system with this；
New endoscopic optical system as described above, the optical system meet following conditional: 2.9 < TTL/ImgH <
3.6；(6)
Wherein, ImgH is the maximum image height of the optical system.
Formula (6) is used to averaging optical system overall length and whole image quality, which is constrained in upper and lower limits, can be limited
Optical system overall length processed meets the miniature requirement of endoscope, and in the preferred range by the constraint of the image quality of camera lens；
New endoscopic optical system as described above, the optical system meet following conditional:
0.3<Ts1/f<0.4；(7)
0.03<T12/f<0.05；(8)
0.6<T2i/f<0.8；(9)
Wherein, Ts1 is distance on the axis of optical filter image side surface S2 to the first lens object side S4, and T12 is the first lens picture
Distance on the axis of side S5 and the second lens object side S6；T2i is distance on the axis of the second lens image side surface S7 to image planes S10.
Formula (7) is mainly used to constrain the length of entire optical system, so that the endoscope satisfies the use demand；
Formula (8) is mainly to constrain the field angle and distortion of optical system, if T12/f is lower than lower limit value, is difficult to meet
The requirement of the big visual field of the design can make distortion far more than design value if T12/f is more than upper limit value.
New endoscopic optical system as described above, the optical system meet following conditional:
0.11<CTs/∑CT<0.20；(10)
0.36<CT1/∑CT<0.44；(11)
0.38<CT2/∑CT<0.44；(12)
Wherein, ∑ CT is optical system optical filter IR, the second lens L2 respectively at the thickness summation on optical axis；CTs is
The optical system hemispherical covers in the thickness on optical axis, and CT1 is the optical system the first lens L1 in the thickness on optical axis, CT2
It is the optical system the second lens L2 in the thickness on optical axis.
Formula (11) can be used to constrain bore and the distortion of optical system, and when CT1/ ∑ CT is more than lower limit, it is abnormal to increase camera lens
Also it will increase molding difficulty of processing while change；When CT1/ ∑ CT is more than the upper limit, camera lens entirety bore can be bigger than normal；
New endoscopic optical system as described above, the optical system meet following conditional:
26<FNO·ImgH/β<56；(13)
Wherein FNO is the f-number of the optical system；β is the vertical axis magnifying power of the optical system.
Formula (13) can be used to limit the camera lens depth of field, illumination and magnifying power, when FNOImgH/ β is lower than lower limit value,
The depth of field of endoscope optical system will be deteriorated, when FNOImgH/ β is more than upper limit value, the vertical amplification of endoscope optical system
Rate will be less than normal, will affect the resolution ratio of camera lens entirety, and camera lens illumination can also decline.
New endoscopic optical system as described above, the optical system meet following conditional:
1.9<f·tan(ω/2)/ImgH<3.5；(14)
Wherein ω is that the optical system is placed in the maximum field of view angle in air.
To sum up, endoscope optical system provided by the utility model, two panels eyeglass are all plastic cement materials, at low cost and suitable
Batch production；This optical system is all smaller compared to previous endoscope overall length and bore, can be very good to meet current endoscope
Size requirements meet the trend of current endoscope miniaturization.
The following are a kind of embodiments of the endoscope optical system.In the corresponding lens data table of the embodiment, radius and
The unit of thickness is mm, and aberration curve figure reference wavelength is 656nm, 587nm, 486nm, and the S (solid line) and T in astigmatism figure are (empty
Line) respectively represent sagittal image surface and meridianal image surface.
By in structure Biao Shi Fig. 1 of the endoscope optical system of the utility model embodiment, by the reality of the utility model
The aberration curve for applying the endoscope optical system of example indicates that in Fig. 2, distortion size indicates in Fig. 3.
Following table is the lens data table of embodiment
Table 1 is the lens data table of endoscope optical system
| Serial number | Surface type | Radius | Thickness | Refractive index | Abbe number |
| Object plane | Spherical surface | ∞ | 4 | ||
| S1 | Spherical surface | ∞ | 0.21 | 1.52 | 64 |
| S2 | Spherical surface | ∞ | 0.27672 | ||
| ST | Spherical surface | ∞ | 0.03042 | ||
| S4 | It is aspherical | 30.830978999 | 0.5694464292 | 1.53 | 56 |
| S5 | It is aspherical | -0.411937846 | 0.0450757394 | ||
| S6 | It is aspherical | 2.2031074403 | 0.5358520592 | 1.63 | 23 |
| S7 | It is aspherical | 0.5231794732 | 0.1729023135 | ||
| S8 | Spherical surface | ∞ | 0.4 | 1.52 | 64 |
| S9 | Spherical surface | ∞ | 0.0963034585 | ||
| Image planes S10 | Spherical surface | ∞ | 0 |
Table 1
Table 2 is the ratio range of each aspherical rise and radius R of the first lens L1 and the second lens L2
Table 2
Combine figure embodiment that the utility model is described in detail above, those skilled in the art can root
Many variations example is made to the utility model according to above description.Thus, certain details in embodiment should not constitute practical to this
Novel restriction, the utility model will be using the ranges that the appended claims define as the protection scope of the utility model.
Claims (9)
1. a kind of new endoscopic optical system, it is characterised in that successively include optical filter (IR), diaphragm from object side to image side
(ST), the first lens (L1) of positive focal length, the second lens (L2) of negative focal length, chip protection glass (CG), the optical system are full
The following conditional of foot:
0.5<f1/f<1.2；
1<f2/f<1.75；
0.92<|R11+R12|/|R11-R12|<1；
Wherein, f1, f2 and f are the focal length of the first lens (L1), the second lens (L2) and whole system, R11 and R12 respectively
It is the radius of curvature of the first lens object side (S4) and the first lens image side surface (S5) respectively.
2. new endoscopic optical system according to claim 1, it is characterised in that: the first lens image side surface (S5) is convex
Face, the second lens object side (S6) are concave surface；First lens (L1) and second lens (L2) are that plastic cement is aspherical
Eyeglass.
3. new endoscopic optical system according to claim 1 or 2, it is characterised in that the optical system meets following item
Part formula:
2.8<Lu/TTL<3.5；Wherein, Lu is the object distance of the optical system, and TTL is the optical system optical filter object side (S1)
Distance on to the axis of imaging surface (S10).
4. new endoscopic optical system according to claim 1 or 2, it is characterised in that the optical system meets following item
Part formula: 20 < | Vd1-Vd2 | < 40, wherein Vd1 is the Abbe number of the first lens (L1)；Vd2 is the Abbe of the second lens (L2)
Number.
5. new endoscopic optical system according to claim 1 or 2, it is characterised in that the optical system meets following item
Part formula: 2.9 < TTL/ImgH < 3.6, wherein ImgH is the maximum image height of the optical system.
6. new endoscopic optical system according to claim 1 or 2, it is characterised in that the optical system meets following item
Part formula:
0.3<Ts1/f<0.4
0.03<T12/f<0.05
0.6<T2i/f<0.8；
Wherein, Ts1 is distance on optical filter image side surface (S2) to the axis of the first lens object side (S4), and T12 is the first lens picture
Distance on the axis of side (S5) and the second lens object side (S6)；T2i is axis of the second lens image side surface (S7) to image planes (S10)
Upper distance.
7. new endoscopic optical system according to claim 1 or 2, it is characterised in that the optical system meets following item
Part formula:
0.11<CTs/∑CT<0.20
0.36<CT1/∑CT<0.44
0.38<CT2/∑CT<0.44
Wherein, ∑ CT is the optical system optical filter (IR), the second lens (L2) respectively at the thickness summation on optical axis；CTs is
The optical system hemispherical covers in the thickness on optical axis, and CT1 is first lens of optical system (L1) in the thickness on optical axis,
CT2 is second lens of optical system (L2) in the thickness on optical axis.
8. new endoscopic optical system according to claim 1 or 2, it is characterised in that the optical system meets following item
Part formula: β < 56 26 < FNOImgH/, wherein FNO is the f-number of the optical system；β is the vertical axis magnifying power of the optical system.
9. new endoscopic optical system according to claim 1 or 2, it is characterised in that the optical system meets following item
Part formula: 1.9 < ftan (ω/2)/ImgH < 3.5, wherein ω is that the optical system is placed in the maximum field of view angle in air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821255504.8U CN208654438U (en) | 2018-08-06 | 2018-08-06 | A kind of new endoscopic optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821255504.8U CN208654438U (en) | 2018-08-06 | 2018-08-06 | A kind of new endoscopic optical system |
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| Publication Number | Publication Date |
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| CN208654438U true CN208654438U (en) | 2019-03-26 |
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| CN201821255504.8U Withdrawn - After Issue CN208654438U (en) | 2018-08-06 | 2018-08-06 | A kind of new endoscopic optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108873311A (en) * | 2018-08-06 | 2018-11-23 | 中山市众盈光学有限公司 | A kind of endoscope optical system of small size |
-
2018
- 2018-08-06 CN CN201821255504.8U patent/CN208654438U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108873311A (en) * | 2018-08-06 | 2018-11-23 | 中山市众盈光学有限公司 | A kind of endoscope optical system of small size |
| CN108873311B (en) * | 2018-08-06 | 2023-10-24 | 中山市众盈光学有限公司 | Endoscope optical system of small-size |
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