CN206235772U - A kind of varifocal optical system - Google Patents
A kind of varifocal optical system Download PDFInfo
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- CN206235772U CN206235772U CN201621135765.7U CN201621135765U CN206235772U CN 206235772 U CN206235772 U CN 206235772U CN 201621135765 U CN201621135765 U CN 201621135765U CN 206235772 U CN206235772 U CN 206235772U
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Abstract
The utility model discloses a kind of varifocal optical system, including sensitive chip (30), sensitive chip (30) side is provided with can be relative to first lens group (10) of its movement, being provided between first lens group (10) and sensitive chip (30) can be relative to mobile the second lens group (20) of sensitive chip (30), diaphragm (40) is provided between second lens group (20) and the first lens group (10), first lens group (10) includes the first lens (1) for being set gradually from thing side to image side, second lens (2) and the 3rd lens (3), and the focal power φ of the first lens group (10)10For just, second lens group (20) includes the 4th lens (4), the 5th lens (5), the 6th lens (6) and the 7th lens (7) that are set gradually from thing side to image side, and the second lens group (20) focal power φ20It is negative.The utility model simple structure, aperture is big, and small volume, pixel is high.
Description
【Technical field】
The utility model is related to a kind of varifocal optical system.
【Background technology】
Shortcoming as the variable focal length optical system generally existing of current monitoring：Resolution ratio is relatively low, and aperture is smaller, optics
System cost is higher, high/low temperature void Jiao etc..Also no camera lens can simultaneously overcome disadvantages mentioned above in the market, only a small number of
Camera lens, can only be improved in one aspect, but sacrifice camera lens other performance index, such as small in order to realize large aperture
Volume, high-resolution must add more glass sphere or glass aspheric lenses in optical system, cause manufacturing cost
Higher, cost cannot be preferably minimized；For cost of implementation minimumization, more plastic aspheric lenes must be added, cause mirror
Head is empty burnt serious under high and low temperature state, and infrared effect is poor.The wide-angle of all of the above shortcoming is not overcome also in the market
Zoom lens.
Therefore, the utility model is based on the not enough of the above and produces.
【Utility model content】
The utility model purpose is to overcome the deficiencies in the prior art, there is provided a kind of simple structure, and aperture is big, small volume,
Pixel is high, infrared confocal, the confocal wide-angle zoom optic system of high/low temperature.
The utility model is achieved through the following technical solutions：
A kind of varifocal optical system, it is characterised in that：Including sensitive chip 30, the described side of sensitive chip 30 is provided with energy
Relative to the first lens group 10 of its movement, being provided between the first described lens group 10 and sensitive chip 30 can relative sensitive chip
Second lens groups 20 of 30 movements, are provided with diaphragm 40 between the second described lens group 20 and the first lens group 10, and described the
One lens group 10 includes the first lens 1, the second lens 2 and the 3rd lens 3 that are set gradually from thing side to image side, and described
The focal power φ of the first lens group 1010For just, the second described lens group 20 includes the set gradually from thing side to image side the 4th
Lens 4, the 5th lens 5, the 6th lens 6 and the 7th lens 7, and the second described lens group 20 focal power φ20It is negative.
Varifocal optical system as described above, it is characterised in that：The focal power φ of the first described lens group 1010With second
The focal power φ of lens group 2020Meet following expression：-0.12≤φ10≤ -0.1,0.1≤φ20≤ 0.2, -1.1≤φ10/
φ20≤-1。
Varifocal optical system as described above, it is characterised in that：The focal power φ of the 4th described lens 44It is saturating with the 5th
The focal power φ of mirror 55Meet following expression：φ4/φ5＞ 0；The coefficient of expansion P of the 4th described lens 44With the 5th lens 5
Coefficient of expansion P5Meet following expression：5 ＜ P4/P5＜ 6.5.
Varifocal optical system as described above, it is characterised in that：The Abbe number VD of the second described lens 22It is saturating with the 3rd
The Abbe number VD of mirror 33Meet following expression：33 ＜ VD2-VD3＜ 35；The Abbe number VD of the 4th lens 44With the 5th lens 5
Abbe number VD5Following expression is met respectively：55 ＜ VD5＜ 57,67 ＜ VD5＜ 69.
Varifocal optical system as described above, it is characterised in that：The first described lens 1 and the 5th lens 5 are sphere
Lens and glass lens is, described the second lens 2, the 3rd lens 3, the 4th lens 4, the 6th lens 6 and the 7th lens 7 are equal
For non-spherical lens and be plastic lens, and the one side of described the 4th lens 4 towards thing side be convex surface, towards image side
It is simultaneously concave surface.
Varifocal optical system as described above, it is characterised in that：The focal power φ of the 6th described lens 66Be it is negative, it is described
The 7th lens 7 focal power φ7For just, and the described two sides of the 6th lens 6 is concave surface.
Varifocal optical system as described above, it is characterised in that：Between the described lens group 20 of sensitive chip 30 and second
It is provided with optical filter 50.
Varifocal optical system as described above, it is characterised in that：Described the second lens 2, the 3rd lens 3, the 4th lens
4th, the 6th lens 6 and the 7th lens 7 are plastic aspheric lenes, and its aspherical surface shape meets below equation：
In formula, parameter c is the curvature corresponding to radius, and y is radial coordinate, and k is that circular cone is secondary
Curve coefficients.When k-factor is less than -1, shape curve in face is hyperbola, is parabola when k is equal to -1, is when k is between -1 to 0
Ellipse, k is circle when being equal to 0, and k is oblateness when being more than 0；α1To α8The coefficient corresponding to each radial coordinate is represented respectively.
Compared with prior art, the utility model has the following advantages：
1st, the utility model is larger in aperture, and high-resolution, the height of optical system are realized in the case that the angle of visual field is larger
Contrast, and periphery resolution ratio and center resolution are quite, and infrared resolution rate and visible ray resolution ratio quite, can meet market
The camera use demand of upper 5M pixels.
2nd, using only two panels glass spheric glass, rest of the lens uses plastic cement aspherical lens to the utility model, in not shadow
Minimumization of cost is realized in the case of ringing optical system other spectrophotometric datas, and it is not empty under high and low temperature state
It is burnt.
3rd, the utility model realizes larger zoom ratio in the case where overall length is shorter, improves varifocal optical system
Optical property.
【Brief description of the drawings】
Fig. 1 is schematic diagram of the present utility model.
【Specific embodiment】
The utility model is further described below in conjunction with the accompanying drawings：
A kind of varifocal optical system, including sensitive chip 30, the described side of sensitive chip 30 is provided with can be relative to its movement
The first lens group 10, be provided between the first described lens group 10 and sensitive chip 30 can relative sensitive chip 30 move the
Two lens groups 20, are provided with diaphragm 40, the first described lens group 10 between the second described lens group 20 and the first lens group 10
Including the first lens 1, the second lens 2 and the 3rd lens 3 that are set gradually from thing side to image side, and the first described lens group
10 focal power φ10For just, the second described lens group 20 includes the 4th lens the 4, the 5th set gradually from thing side to image side
Lens 5, the 6th lens 6 and the 7th lens 7, and the second described lens group 20 focal power φ20It is negative.It is larger in aperture,
High-resolution, the high-contrast of optical system are realized in the case that the angle of visual field is larger, and periphery resolution ratio and center are differentiated
Quite, infrared resolution rate and visible ray resolution ratio quite, can meet the camera use demand of in the market 5M pixels to rate.Wide-angle enters
The light penetrated diminishes by light angle after the first lens group 10, subsequently enters the second lens group 20 so that whole optical system
The focal plane position of system is moved rearwards by.
The focal power φ of the first described lens group 1010With the focal power φ of the second lens group 2020Satisfaction is expressed as below
Formula：-0.12≤φ10≤ -0.1,0.1≤φ20≤ 0.2, -1.1≤φ10/φ20≤-1.Therefore, optical system can be realized as
Less overall length so that optical system small volume and it is compact, and realize larger zoom ratio.
The focal power φ of the 4th described lens 44With the focal power φ of the 5th lens 55Meet following expression：φ4/φ5
＞ 0；The coefficient of expansion P of the 4th described lens 44With the coefficient of expansion P of the 5th lens 55Meet following expression：5 ＜ P4/P5
＜ 6.5.Therefore, the confocal performance indications of the high/low temperature of optical system are more excellent.
The Abbe number VD of the second described lens 22With the Abbe number VD of the 3rd lens 33Meet following expression：33 ＜
VD2-VD3＜ 35, it is possible to the ratio chromatism, that correction wide-angle is produced, increases substantially optical system periphery resolving power；The
The Abbe number VD of four lens 44With the Abbe number VD of the 5th lens 55Following expression is met respectively：55 ＜ VD5＜ 57,67 ＜ VD5
＜ 69, can calibration axial chromatic aberration, realize that visible ray and infrared light are confocal.
The first described lens 1 and the 5th lens 5 are spherical lens and are glass lens, described the second lens 2,
3rd lens 3, the 4th lens 4, the 6th lens 6 and the 7th lens 7 are non-spherical lens and are plastic lens.Second lens
2 and the 3rd lens 3 use non-spherical lens, can correct because of the larger picture for causing of the angle of incident light of the first lens group 10
Dissipate, periphery resolving power is further improved, and the second lens 2 can also correct the coma of incident ray.4th lens 4 are using non-
Spherical lens, corrects the spherical aberration and diaphragm coma of heavy caliber incident ray, and the one side towards thing side of the 4th lens 4 is convex
Face, the one side towards image side are concave surface, can so improve the light bore of the second lens group 20, are realized compared with large aperture.
The focal power φ of the 6th described lens 66It is the focal power φ of the 7th negative, described lens 77It is for just and described
The two sides of the 6th lens 6 be concave surface, the resolving power of central vision and surrounding visual field can be increased substantially, realize big visual field
Angle, high-resolution, high-contrast.
Optical filter 50 is provided between the described lens group 20 of sensitive chip 30 and second.
Described the second lens 2, the 3rd lens 3, the 4th lens 4, the 6th lens 6 and the 7th lens 7 are that plastic cement is aspherical
Lens, its aspherical surface shape meets below equation：
In formula, parameter c is the curvature corresponding to radius, and y is that its unit of radial coordinate and lens are long
Degree unit is identical, and k is circular cone whose conic coefficient.When k-factor is less than -1, shape curve in face is hyperbola, and k is throwing when being equal to -1
Thing line, is ellipse when k is between -1 to 0, and k is circle when being equal to 0, and k is oblateness when being more than 0；α1To α8Each footpath is represented respectively
To the coefficient corresponding to coordinate.
It is below the actual design parameter of 3X zoom lens：
The coefficient of the first face S3 of the second described lens 2 is：
k：3.40234
a1：0
a2：-0.00024583658
a3：1.6456488e-005
a4：-2.7673846e-007
a5：2.7028091e-009
a6：7.1502633e-012
a7：0
a8：0
The coefficient of the second face S4 of the second described lens 2 is：
k：-4.268
a1：0
a2：-0.0002343518
a3：5.1069679e-006
a4：1.4551328e-007
a5：-2.604887e-009
a6：5.1401583e-011
a7：0
a8：0
The coefficient of the first face S5 of the 3rd described lens 3 is：
k：-1.244
a1：0
a2：0.00013061221
a3：-1.7648774e-006
a4：1.2649139e-007
a5：5.4551842e-010
a6：-8.9048658e-011
a7：0
a8：0
The coefficient of the second face S6 of the 3rd described lens 3 is：
k：184.71
a1：0
a2：0.00016643406
a3：4.7983669e-006
a4：-1.21138e-007
a5：-2.0567073e-009
a6：-2.1003312e-011
a7：0
a8：0
The coefficient of the first face S8 of the 4th described lens 4 is：
k：1.696
a1：0
a2：0.0005310386
a3：9.4913028e-006
a4：-1.6249913e-006
a5：-4.7913991e-008
a6：1.9259367e-009
a7：3.8751991e-013
a8：-1.064423e-011
The coefficient of the second face S9 of the 4th described lens 4 is：
k：297.26
a1：0
a2：0.0015459153
a3：4.3571996e-006
a4：-1.8188738e-006
a5：-6.1974286e-008
a6：-2.812532e-009
a7：1.1527772e-010
a8：-4.2808473e-012.
The coefficient of the first face S12 of the 6th described lens 6 is：
k：-51.689
a1：0
a2：0.00031971344
a3：-2.3927236e-005
a4：-3.8900355e-007
a5：-1.4594505e-008
a6：-2.7204241e-009
a7：-1.2016645e-010
a8：2.3449603e-011
The coefficient of the second face S13 of the 6th described lens 6 is：
k：-0.269
a1：0
a2：-0.00084231835
a3：4.5976336e-005
a4：6.9078115e-006
a5：-3.6419011e-007
a6：-7.5136833e-008
a7：-2.450137e-009
a8：1.2591545e-009
The coefficient of the first face S14 of the 7th described lens 7 is：
k：-1.26
a1：0
a2：-0.0014278246
a3：-2.1111034e-005
a4：-2.1896881e-006
a5：1.9782997e-007
a6：-3.9647663e-008
a7：-5.0742801e-009
a8：2.0871373e-011
The coefficient of the second face S15 of the 7th described lens 7 is：
k：15.328
a1：0
a2：-0.00036735947
a3：-4.319447e-005
a4：-5.5789703e-006
a5：8.3419913e-008
a6：-1.365999e-008
a7：1.8885198e-009
a8：-5.2111744e-010
In optical system zoom, between the first described lens group 10 and the second lens group 20 at intervals of 1.37mm extremely
20.508mm。
Claims (8)
1. a kind of varifocal optical system, it is characterised in that：Including sensitive chip (30), described sensitive chip (30) side is provided with
Can be relative to first lens group (10) of its movement, being provided between described the first lens group (10) and sensitive chip (30) can be relative
Mobile the second lens group (20) of sensitive chip (30), is provided between described the second lens group (20) and the first lens group (10)
Diaphragm (40), described the first lens group (10) includes the first lens (1), the second lens that are set gradually from thing side to image side
(2) and the 3rd lens (3), and described the first lens group (10) focal power φ10For just, described the second lens group (20)
Including the 4th lens (4), the 5th lens (5), the 6th lens (6) and the 7th lens (7) that are set gradually from thing side to image side, and
And the focal power φ of described the second lens group (20)20It is negative.
2. varifocal optical system according to claim 1, it is characterised in that：The focal power of described the first lens group (10)
φ10With the focal power φ of the second lens group (20)20Meet following expression：-0.12≤φ10≤ -0.1,0.1≤φ20≤
0.2, -1.1≤φ10/φ20≤-1。
3. varifocal optical system according to claim 2, it is characterised in that：The focal power φ of the 4th described lens (4)4
With the focal power φ of the 5th lens (5)5Meet following expression：(φ4/φ5) ＞ 0；The expansion system of the 4th described lens (4)
Number P4With the coefficient of expansion P of the 5th lens (5)5Meet following expression：5 ＜ P4/P5＜ 6.5.
4. varifocal optical system according to claim 3, it is characterised in that：The Abbe number VD of described the second lens (2)2
With the Abbe number VD of the 3rd lens (3)3Meet following expression：33 ＜ (VD2-VD3) ＜ 35；The Abbe number of the 4th lens (4)
VD4With the Abbe number VD of the 5th lens (5)5Following expression is met respectively：55 ＜ VD5＜ 57,67 ＜ VD5＜ 69.
5. varifocal optical system according to claim 4, it is characterised in that：Described the first lens (1) and the 5th lens
(5) it is spherical lens and is glass lens, described the second lens (2), the 3rd lens (3), the 4th lens (4), the 6th
Lens (6) and the 7th lens (7) are non-spherical lens and are plastic lens, and described the 4th lens (4) are towards thing
Side for convex surface, towards image side while be concave surface.
6. varifocal optical system according to claim 5, it is characterised in that：The focal power φ of the 6th described lens (6)6
It is the focal power φ of the 7th negative, described lens (7)7For just, and the 6th described lens (6) two sides is concave surface.
7. varifocal optical system according to claim 1, it is characterised in that：Described sensitive chip (30) and the second lens
Optical filter (50) is provided between group (20).
8. varifocal optical system according to claim 1, it is characterised in that：Described the second lens (2), the 3rd lens
(3), the 4th lens (4), the 6th lens (6) and the 7th lens (7) are plastic aspheric lenes, and its aspherical surface shape meets
Below equation：
In formula, parameter c is the curvature corresponding to radius, and y is radial coordinate, and k is that circular cone is secondary
Curve coefficients；When k-factor is less than -1, shape curve in face is hyperbola, is parabola when k is equal to -1, is when k is between -1 to 0
Ellipse, k is circle when being equal to 0, and k is oblateness when being more than 0；α1To α8The coefficient corresponding to each radial coordinate is represented respectively.
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| CN201621135765.7U CN206235772U (en) | 2016-10-18 | 2016-10-18 | A kind of varifocal optical system |
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| CN201621135765.7U CN206235772U (en) | 2016-10-18 | 2016-10-18 | A kind of varifocal optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443990A (en) * | 2016-10-18 | 2017-02-22 | 中山联合光电科技股份有限公司 | Low-cost zoom optical system with large aperture and small size |
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2016
- 2016-10-18 CN CN201621135765.7U patent/CN206235772U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443990A (en) * | 2016-10-18 | 2017-02-22 | 中山联合光电科技股份有限公司 | Low-cost zoom optical system with large aperture and small size |
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