CN204790166U - Optics zoom and focusing optical system - Google Patents
Optics zoom and focusing optical system Download PDFInfo
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- CN204790166U CN204790166U CN201520460774.2U CN201520460774U CN204790166U CN 204790166 U CN204790166 U CN 204790166U CN 201520460774 U CN201520460774 U CN 201520460774U CN 204790166 U CN204790166 U CN 204790166U
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Abstract
The utility model provides an optics zoom and focusing optical system, including arranging first, second, third and the fourth lens for " just - burden - just - burden " in proper order, wherein the focal power of first lens is being for just, and the focal power of second lens is the burden, and the focal power of third lens is for just, and the focal power of fourth lens is for negative. Should the system of zooming zoom optical system with the distance for f0's f theta lens group synthesis. The focal power of each lens accords with following requirement with the focal power ratio of system: 1.1< F1f0< 1.2 - 0.1< F2f0< - 0.04, 0.2< F3f0< 0.4 - 2.8< F4f0< - 2.4, wherein f1 is the focal power of first lens, and f2 is the focal power of second lens, and f3 is the focal power of third lens, and f4 is the focal power of fourth lens, the focal power of f0 for zooming lens entire system when being in the center that zooms the moving range. Systematic focus excursion is fa to fb, is not less than 0.275 with f theta camera lens focus f0's ratio (fb -fa) f0.
Description
Technical field
The utility model relates to optical technology, particularly relates to the Zoom optic lens for Laser Processing and focusing optical system.
Background technology
At present, laser application has been deep into the various aspects of our modern life.Wherein the commercial Application of laser is also more and more extensive, and be unable to do without the applied optics system meeting various technological requirement in laser application.Optical system in industrial lasers application, mainly contains f θ mirror optical system, Focused Optical system and varifocal optical system.
In the Three-dimension process system of laser, varifocal optical system is very important ingredient.Prefocusing system and rear focusing system is divided into again in three-dimensional laser processing.
Prefocusing system, completely by the optical zoom of system, makes focus on three dimensions, realize fixed point processing in conjunction with software control.The focal-distance tuning range of prefocusing system is large, and focal length is also longer, makes the consistance of machining area poor.For the processing of stereo circuit, because it is higher to the coherence request of dimensional accuracy and processing effect, generally do not adopt such optical system.
Then focusing system is combined with f θ lens optical system by varifocal optical system and realizes three-dimensional laser processing.F θ lens optical system is a field flattening optical system, and advantage is in same plane, and Laser Processing effect is almost consistent.Therefore, by being combined with varifocal optical system, the focal plane of the f θ lens optical system after zoom will change, and form a three-dimensional machining area.And the effect of each plane of this machining area is consistent, the focal length variations in Different Plane is less, and therefore, the effect obtained is also more consistent.
But in the system of processing of reality, in order to improve working (machining) efficiency, when ensureing that the processing effect of each focal plane is more consistent, make the scope of laser focusing as far as possible large.Zoom system, pancreatic system in the market and focal length be the mirror of F254 to when coordinating, zooming range is generally at about 50mm.And for main application fields---the antenna for mobile phone field of current stereo circuit, in order to make a workpiece disposablely machine, require that zooming range is at about 70mm.
Utility model content
Based on this, be necessary to provide a kind of Zoom optic lens and focusing optical system, large zooming range can be realized.
The utility model embodiment provides a kind of Zoom optic lens, comprise first, second, third and the 4th lens that are arranged in order as " Negative-Positive-Negative-negative ", wherein said first power of lens is just, second power of lens is negative, 3rd power of lens is just, the 4th power of lens is negative.The focal power ratio of described each power of lens and system meets following requirement: 1.1<f1/f<1.2;-0.1<f2/f<-0.04; 0.2<f3/f<0.4;-2.8<f4/f<-2.4; Wherein f1 is the first power of lens, and f2 is the second power of lens, and f3 is the 3rd power of lens, and f4 is the 4th power of lens, and f is the focal power of whole system.
The utility model embodiment also provides a kind of focusing optical system, at least comprises a f θ camera lens and above-mentioned Zoom optic lens.
Focusing optical system of the present utility model and Zoom optic lens thereof, when keeping mechanical focusing displacement constant, can realize large zooming range.And, while solving large zooming range problem, ensure that the image quality of whole optical system is consistent in focussing process.
Accompanying drawing explanation
Fig. 1 is the structural representation of Zoom optic lens of the present utility model.
Fig. 2 is the ray tracing figure of Zoom optic lens of the present utility model.
Fig. 3 point range figure that to be optical focal distance setting system of the present utility model change with the back focal length of f θ camera lens.
Fig. 4 diffraction fringe self-energy schematic diagram that to be Zoom optic lens of the present utility model change with the back focal length of f θ camera lens.
Embodiment
Below in conjunction with multiple accompanying drawing, the technical program is described further.
Varifocal optical system, together with f θ camera lens, forms the laser variable-focus system of processing of a prefocusing.When for LDS laser processing application, the variation range of focusing and focal length has particular/special requirement.
Refer to Fig. 1, it is the structural representation of optical focal distance setting system of the present utility model.Described focusing optical system at least comprises the f θ camera lens and a Zoom optic lens that a focal length is f0.Described Zoom optic lens comprises the first lens L1, the second lens L2, the 3rd lens L3 and the 4th lens L4 of the optical power profile adopting four-piece type " Negative-Positive-Negative-negative ", wherein the focal power of the first lens L1 is just, the focal power of the second lens L2 is negative, the focal power of the 3rd lens L3 is just, the focal power of the 4th lens L4 is negative.The focal power f0 ratio of each power of lens and f θ camera lens meets following condition:
1.1<f1/f0<1.2；
-0.1<f2/f0<-0.04；
0.2<f3/f0<0.4；
-2.8<f4/f0<-2.4；
Wherein, f1 is the focal power of the first lens L1, and f2 is the focal power of the second lens L2, and f3 is the focal power of the 3rd lens L3, and f4 is the focal power of the 4th lens L4, and f0 is the focal power of f θ camera lens in whole optical focal distance setting system.
In the present embodiment, the first lens L1 is the positive lens of curved month type, the second lens L2 is double concave type negative lens, and the 3rd lens L3 is biconvex positive lens, and the 4th lens L4 is the negative lens of curved month type.All curved surfaces of the first lens L1, the 4th lens L4 are all bending towards diaphragm direction.
More specifically, two curved surfaces S1, S2 that the first lens L1 is R1, R2 by radius-of-curvature are respectively formed, and the center thickness defined on its optical axis is d1, and materials optical parameter is Nd1:Vd1.
Two curved surfaces S3, S4 that second lens L2 is R3, R4 by radius-of-curvature are respectively formed, and define the center thickness d3 on its optical axis, and materials optical parameter is Nd3:Vd3.
Two curved surfaces S5, S6 that 3rd lens L3 is R5, R6 by radius-of-curvature are respectively formed, and define the center thickness d5 on its optical axis, and materials optical parameter is Nd5:Vd5.
Two curved surfaces S7, S8 that 4th lens L4 is R7, R8 by radius-of-curvature are respectively formed, and define the center thickness d7 on its optical axis, and materials optical parameter is Nd7:Vd7.
In addition, define the first lens L1 and the second lens L2 and be spaced apart d2 on optical axis, the second lens L2 and the 3rd lens L3 is spaced apart d4 on optical axis, and the 3rd lens L3 and the 4th lens L4 is spaced apart d6 on optical axis; Be provided with diaphragm after 4th lens L4, the center of the 4th lens L4 and described diaphragm central cross-section on optical axis at a distance of d8; Be provided with described f θ camera lens after diaphragm, the focal length of described f θ camera lens is f0, and the variation range of the back focal length of described focusing optical system is fa-fb.
Incorporated by reference to Fig. 2, by changing the interval d2 of the first lens L1 and the second lens L2, and changing the interval d4 of the second lens L2 and the 3rd lens L3, can focusing structure be realized.Wherein, the summation of interval d2 and d4 is definite value.That is: in focussing process, the position of the first lens L1, the 3rd lens L3 and the 4th lens L4 does not change, and only changes the position of the second lens L2.
In conjunction with the definition of above structure and parameters, devise a described Zoom optic lens, its concrete data are as follows respectively:
Example one:
f0＝254mmfa＝221mmfb＝294mm
λ＝1064nm
f1/f0＝1.14f2/f0＝-0.058
f3/f0＝0.33f4/f0＝-2.55
Wherein, f0, fa, fb are the original focal length of f θ camera lens, the shortest back focal length and the longest back focal length respectively, and λ is optical maser wavelength.In addition, known by above table, in the present embodiment, radius of curvature R 1 ~ R8 corresponds respectively to the numerical value that curved surface is numbered S1 ~ S8, the center thickness d1=3mm of described first lens L1 on optical axis, materials optical Parameter N d1:Vd1=1.8/25.5, the center thickness d3=1.5mm of described second lens L2 on optical axis, materials optical Parameter N d3:Vd3=1.46/67.8, the center thickness d5=4mm of described 3rd lens L3 on optical axis, materials optical parameter is Nd5:Vd5=1.8/25.4, the center thickness d7=4mm of described 4th lens L4 on optical axis, materials optical parameter is Nd7:Vd7=1.52/64.2.
Be appreciated that in other embodiments, described radius-of-curvature, center thickness and materials optical all can be modified according to actual needs.In described optical focusing lens, described first lens L1 and the second lens L2 is spaced apart d2=209mm on optical axis, second lens L2 and the 3rd lens L3 is spaced apart d4=76mm on optical axis, and the 3rd lens L3 and the 4th lens L4 is spaced apart d6=2mm on optical axis; Be provided with diaphragm after 4th lens L4, the center of the 4th lens L4 and described diaphragm central cross-section on optical axis at a distance of d8=150mm; A f θ camera lens is had, its focal distance f 0=254mm after diaphragm.
In described optical focusing lens, realized the focusing of whole optical focal distance setting system by the position changing the second lens L2, in the present embodiment, the displacement of described second lens L2 is d2=209 ± 5mm, and d2+d4=285mm.And, described optical focusing lens and focal length be 254mm f θ camera lens with the use of.That is, change interval d2 and d4, but theirs is constant with d2+d4=209+76=285.
As d2=209, d4=76, the back focal length of optical system is f0=254;
As d2=204, d4=81, the back focal length of optical system is f0=221;
As d2=214, d4=71, the back focal length of optical system is f0=294.
In the present embodiment, described optical focusing lens and focal length be 254mm f θ camera lens with the use of, the back focal length variation range of whole optical system is 221mm-294mm, its focussing distance is 73mm, be (294-221)/254=0.287 with the ratio of f θ lens focus f0, be greater than 0.285, a disposable requirement machined of workpiece can be achieved.
In addition, as can be seen from Fig. 3 also, this system has good image quality on different focal planes.And it can also be seen that from Fig. 4, this system is diffraction fringe self-energy on different focal planes, energy in the circle that radius is 25um has all concentrated more than 80%, thus can reach good processing effect in three-dimensional laser processing system, and improves imaging consistency.
Focusing optical system of the present utility model and Zoom optic lens thereof, when keeping mechanical focusing displacement constant, can realize large zooming range.And, while solving large zooming range problem, ensure that the image quality of whole optical system is consistent in focussing process.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (4)
1. a Zoom optic lens, for an optical focal distance setting system, it is characterized in that, described Zoom optic lens comprises first, second, third and the 4th lens that are arranged in order as " Negative-Positive-Negative-negative ", wherein said first power of lens is just, the second power of lens is negative, and the 3rd power of lens is just, 4th power of lens is negative, and the focal power ratio of described each power of lens and optical focal distance setting system meets following requirement:
1.1<f1/f0<1.2；
-0.1<f2/f0<-0.04；
0.2<f3/f0<0.4；
-2.8<f4/f0<-2.4；
Wherein f1 is the first power of lens, and f2 is the second power of lens, and f3 is the 3rd power of lens, and f4 is the 4th power of lens, and f0 is the focal power of whole optical focal distance setting system.
2. Zoom optic lens as claimed in claim 1, it is characterized in that, described first lens are the positive lens of curved month type, second lens are double concave type negative lens, 3rd lens are biconvex positive lens, 4th lens are curved month type negative lens, and all curved surfaces of described first lens, the 4th lens are all bending towards diaphragm direction.
3. Zoom optic lens as claimed in claim 1, is characterized in that, described first lens and the second lens are spaced apart d2 on optical axis, and the second lens and the 3rd lens are spaced apart d4 on optical axis, in focussing process, d2 and d4 with remain unchanged.
4. a focusing optical system, at least comprises a f θ camera lens and the Zoom optic lens as described in any one of claims 1 to 3 item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520460774.2U CN204790166U (en) | 2015-06-30 | 2015-06-30 | Optics zoom and focusing optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520460774.2U CN204790166U (en) | 2015-06-30 | 2015-06-30 | Optics zoom and focusing optical system |
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| CN204790166U true CN204790166U (en) | 2015-11-18 |
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| CN201520460774.2U Expired - Fee Related CN204790166U (en) | 2015-06-30 | 2015-06-30 | Optics zoom and focusing optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108857052A (en) * | 2018-09-04 | 2018-11-23 | 深圳市拓博瑞激光科技有限公司 | The confocal focusing optical system of dual wavelength |
-
2015
- 2015-06-30 CN CN201520460774.2U patent/CN204790166U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108857052A (en) * | 2018-09-04 | 2018-11-23 | 深圳市拓博瑞激光科技有限公司 | The confocal focusing optical system of dual wavelength |
| CN108857052B (en) * | 2018-09-04 | 2024-03-19 | 深圳市拓博瑞激光科技有限公司 | Dual-wavelength confocal focusing optical system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 Termination date: 20190630 |