CN205263390U - Big light ring continuous -zoom lens of general type of long wave infrared - Google Patents

Abstract

The utility model belongs to the technical field of optics, a big light ring continuous -zoom lens of general type of long wave infrared is related to. The utility model discloses a technical scheme include: has positive refractive power's preceding fixed group, for the falcate germanium positive lens of a slice convex surface towards the object space, the change that has negative optical power is doubly organized, for the germanium negative lens of a slice double concave, the compensation that has positive refractive power is organized, for the lenticular germanium positive lens of a slice, the after -fixing that has negative optical power is organized, for the falcate germanium negative lens of a slice convex surface towards the image space, the focusing that has positive refractive power is organized, for the lenticular germanium positive lens of a slice. The utility model discloses working wavelength range is 8~12 microns, and the focus is 20mm~100mm, F number = 0.8@f20mm, and F number = 1.0@f100mm, adaptation resolution ratio is 640x512, non - refrigeration detector that the pixel size is 15 microns, optical system overall length 210mm, heavy -calibre 101mm. The utility model discloses a compact structure zooms the curve smoothing, debugs portably, and easy volume production, the image quality is good in the whole zoom range.

Description

The universal large aperture continuous magnification lens of a kind of LONG WAVE INFRARED

Technical field

The utility model belongs to optical technical field, relates to a kind of for the universal large aperture continuous vari-focus of LONG WAVE INFRARED mirrorHead.

Background technology

The application of technology is more and more extensive in recent years. Long wave uncooled detector is lightweight, volume is little, along with falling of costLow, its range of application is such as, from the military civil area that spreads to, security protection, industry, medical treatment etc. Common tight shot andDouble-view field camera lens can not meet user demand under some occasion. The continuous magnification lens that this patent relates to, uses five mirrorsSheet, mobile wherein two eyeglasses, realize the smooth change of focal length, thereby can better realize discovery to target, tracking andIdentification.

Chinese patent CN102866485 discloses a kind of long-wave infrared continuous zoom lens, comprises by object space to imaging sideThe first lens group with positive diopter that sets gradually, there is negative dioptric the second lens group, there is the of positive diopterThree lens groups, there is negative dioptric the 4th lens group, the first speculum of using for the light path of turning back, there is the of positive diopterFive lens groups, the second speculum of using for the light path of turning back and there is one the 6th lens group of positive diopter. Long wave of the present inventionInfrared continuous zoom lens, improving as far as possible on the basis of surveying operating distance and raising picture element, has reduced cost and volume,And can reach good imaging effect. But the speculum that comprises of the present invention, complex structure, volume is large, is unfavorable for carrying.

Utility model content

The technical problems to be solved in the utility model is to provide the total length of a kind of optics, and volume is little, debugs conveniently, becomes picture elementMeasure the universal large aperture continuous magnification lens of high LONG WAVE INFRARED. Its service band is 8～12 microns, focal length be 20mm～100mm, F number=0.8f20mm, F number=1.0f100mm, adaptive resolution ratio is 640x512, the long wave that Pixel size is 15 micronsUncooled detector, optical system overall length 210mm, maximum caliber 101mm.

To achieve these goals, the technical solution adopted in the utility model is:

The universal large aperture continuous magnification lens of a kind of LONG WAVE INFRARED, is comprised first fixing group, change successively to image space by object spaceTimes group, compensation group, latter fixing group, focusing group and long wave uncooled detector;

Described first fixing group has positive light coke, for a slice convex surface is towards the falcate germanium single crystal positive lens of object space, surfaceType is sphere;

Described zoom group has negative power, is a slice double concave germanium single crystal negative lens, and its side towards image space is non-Sphere, total shift motion 27.33mm of described lens, for changing the focal length of described long-wave infrared continuous zoom lens;

Described compensation group has positive light coke, is the lenticular germanium single crystal positive lens of a slice, and its side towards object space is non-Sphere, total shift motion 28.49mm of described lens, occurs when compensating described long-wave infrared continuous zoom lens zoomThe skew of image planes position;

Described latter fixing group has negative power, and for a slice convex surface is towards the falcate germanium single crystal negative lens of image space, it is recessedFace is diffraction surfaces;

Described focusing group has positive light coke, is the lenticular germanium single crystal positive lens of a slice, and its side towards object space is non-Sphere, total shift motion 3mm of described lens, the skew of image planes position when compensating different temperatures and different object distances;

After described focusing group, be long wave uncooled detector, comprise protecting window and image planes; Aperture diaphragm is positioned at compensationOrganize and between latter fixing group, in zoom process, keep constant.

Described camera lens meets following parameter:

Effective focal length EFL=20～the 100mm of described camera lens, F number=0.8f20mm, F number=1.0f100mm, opticsSystem overall length=210mm, adaptive detector resolution 640x512, Pixel size 15 μ m.

The horizontal field of view angular region of described camera lens is: 2 ω=27 °～5.5 °.

Aspheric surface in the eyeglass of described camera lens meets following expression formula:

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-\left(1+k\right)c^2{r}^2}}+{\mathrm{\α}}_2{r}^4+{\mathrm{\α}}_3{r}^6+{\mathrm{\α}}_4{r}^8+{\mathrm{\α}}_5{r}^{10}+{\mathrm{\α}}_6{r}^{12}$

Wherein z is aspheric surface along optical axis direction when highly for the position of r, and apart from the distance rise on aspheric surface summit, c representsThe vertex curvature on surface, k is circular cone coefficient, α₂、α₃、α₄、α₅、α₆For high order aspheric surface coefficient.

Diffraction surfaces in the eyeglass of described camera lens meets following expression formula:

Φ＝A₁ρ²+A₂ρ⁴

The position phase that wherein Φ is diffraction surfaces, ρ=gamma/delta_n,γ_nThe planning radius of diffraction surfaces, A₁、A₂For the position of diffraction surfacesPhase coefficient.

The average MTF of the full visual field of described camera lens > 0.4520lp/mm.

The lens S1 plated surface diamond-like-carbon rete of described first fixing group, lens S2, the zoom group of described first fixing groupLens S3 and lens S9 and the S10 surface of the lens S5 of S4, compensation group and S6, the lens S7 of latter fixing group and S8, focusing groupAll plate antireflective coating.

The beneficial effects of the utility model are: have 5 times of zoom ratios, optical system overall length is 210mm, maximum caliber101mm. Compact conformation, zoom curve smoothing, the maximum amount of movement of eyeglass is 28.49mm. Zoom group and compensation group all only have a sliceLens, can better ensure the optical axis stable in zoom process like this. Use refraction type optical texture simultaneously, need not adjustSpeculum, debugs easyly, is easy to volume production. In whole zooming range, image quality is good, the average MTF of full visual field > 0.4520lp/mm. The utility model compact conformation, transmitance be high, be easy to volume production, and focal length covers wide-angle and middle long burnt section, is convenient toMonitoring and small field of view details are observed on a large scale. System overall length is shorter, lightweight, is easily integrated in handheld device, therefore canThere is good application prospect.

Brief description of the drawings

Fig. 1 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 100mmOptical system diagram;

Fig. 2 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 100mmPoint range figure;

Fig. 3 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 100mmOptical transfer function figure (cut-off resolution ratio is 20lp/mm);

Fig. 4 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 100mmAstigmatism distortion figure;

Fig. 5 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 60mmOptical system diagram;

Fig. 6 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 60mmPoint range figure;

Fig. 7 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 60mmOptical transfer function figure (cut-off resolution ratio is 23lp/mm);

Fig. 8 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 60mmAstigmatism distortion figure;

Fig. 9 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 20mmOptical system diagram;

Figure 10 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 20mmPoint range figure;

Figure 11 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 20mmOptical transfer function figure (cut-off resolution ratio is 27lp/mm);

Figure 12 is that the focal length of the universal large aperture continuous magnification lens of LONG WAVE INFRARED that provides of the utility model is while being 20mmAstigmatism distortion figure.

Wherein, 200-object space, fixing group before 110-, 120-zoom group, 130-compensation group, 140-aperture diaphragm, 150-Rear fixing group, 160-focusing group, 310-long wave uncooled detector, 312-protecting window, 314-image planes, S1～S10 is lensEach surface.

Detailed description of the invention

Below in conjunction with accompanying drawing, by embodiment, the utility model is described in further details.

This embodiment is that the utility model is applied to long wave non-refrigeration type resolution ratio 640 × 512 pixel dimension 15 μ m and staresThe example of formed coke planar detector.

Fig. 1, Fig. 5, Fig. 9 are respectively the optical system diagram of the utility model in the time of focal length 100mm, 60mm and 20mm, described inThe structure of camera lens is identical, using one of them figure as example is as explanation.

As shown in Figure 1, the present embodiment 1 is by front fixing group 110 of positive light coke, the zoom group 120 of negative power, positive light JiaoRear fixing group 150 of compensation group 130, the negative power of degree, the focusing group 160 of positive light coke and the last non-refrigeration of long wave are visitedSurveying device 310 forms.

Front fixing group 110 is first lens, and for convex surface is towards the positive lens of object space, material is germanium single crystal, two surfaceBe sphere, this sheet eyeglass bore is large, does not therefore use aspheric surface; I.e. the second lens of zoom group 120, for concave concave thoroughly negativeMirror, material is germanium single crystal, S4 surface is aspheric surface. The second lens are mobile eyeglasses, have played the effect of zoom in zoom process,Moving curve is 5 parabolas, total shift motion 27.33mm; I.e. the 3rd lens of compensation group 130 are lenticular positive lens, materialMaterial is germanium single crystal, and S5 surface is aspheric surface. The 3rd lens are mobile eyeglasses, in the time that the eyeglass of zoom group 120 moves, and compensation groupThereby 130 eyeglass does corresponding movement and ensures image planes invariant position, and moving curve is straight line, total shift motion 28.49mm; AfterI.e. the 4th lens of fixing group 150, for convex surface is towards the negative meniscus of image space, material is germanium single crystal, S7 surface is that diffraction is non-Sphere. I.e. the 5th lens of focusing group 160, are lenticular positive lens, and material is germanium single crystal, and wherein S9 face is aspheric surface. The 5th is saturatingMirror is mobile eyeglass, when target range changes and when operating temperature changes, can again focus on mobile eyeglass,Total shift motion 3mm; Long wave uncooled detector 310 comprises: protecting window 312, and imaging surface 314, resolution ratio is 640x512,Pixel size 15 μ mx15 μ m. The aperture diaphragm 140 of system, between compensation group and latter fixing group. Aperture in zoom processFootpath is constant.

In above five lens, first lens S1 plated surface diamond-like carbon film, because this is surface exposed, need to plate eka-goldDiamond carbon film carbon film plays protective effect, and anti-reflection film is all plated on all the other S2～S10 surfaces.

Table 1 be the utility model at focal length 100mm, 60mm, Optic structure parameter when 20mm:

Table 1

The aspheric surface of mentioning in above eight lens, is even aspheric surface, and its expression formula is as follows

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-\left(1+k\right)c^2{r}^2}}+{\mathrm{\α}}_2{r}^4+{\mathrm{\α}}_3{r}^6+{\mathrm{\α}}_4{r}^8+{\mathrm{\α}}_5{r}^{10}+{\mathrm{\α}}_6{r}^{12}$

Wherein z is aspheric surface along optical axis direction when highly for the position of r, and apart from the distance rise on aspheric surface summit, c representsThe vertex curvature on surface, k is circular cone coefficient, α₂、α₃、α₄、α₅、α₆For high order aspheric surface coefficient.

Table 2 is surperficial S4, S5, and S8, S10, the asphericity coefficient of S13:

Table 2

The diffraction surfaces of mentioning in above five lens, its expression formula is as follows:

Φ＝A₁ρ²+A₂ρ⁴

The position phase that wherein Φ is diffraction surfaces, ρ=γ/γ_n,γ_nThe planning radius of diffraction surfaces, A₁、A₂For the position of diffraction surfacesPhase coefficient. Table 3 is the diffraction coefficient of surperficial S7;

Table 3

Surface
			S7	-25.53677	-1.17239276

Below with reference to Aberration Analysis figure, effect of the present utility model is done to further detailed description.

Fig. 2-Fig. 4 is that the specific embodiment of the universal large aperture continuous magnification lens of the LONG WAVE INFRARED described in Fig. 1 is burnt in lengthAberration Analysis figure when state, Fig. 2 is that point range figure, Fig. 3 are that MTF figure, Fig. 4 are curvature of field distortion figure;

Fig. 6-Fig. 8 is that the specific embodiment of the universal large aperture continuous magnification lens of the LONG WAVE INFRARED described in Fig. 5 is middle JiaoAberration Analysis figure when state, Fig. 6 is that point range figure, Fig. 7 are that MTF figure, Fig. 8 are curvature of field distortion figure;

Figure 10-Figure 12 is that the specific embodiment of the universal large aperture continuous magnification lens of the LONG WAVE INFRARED described in Fig. 9 is shortAberration Analysis figure when burnt state, Figure 10 is that point range figure, Figure 11 are that MTF figure, Figure 12 are curvature of field distortion figure.

From above figure, find, the various aberrations of each burnt section have obtained correction, and disc of confusion is all corrected to and approaches Ai LibanSize, MTF approaches diffraction limit, distortion < 5%. As can be seen here, the universal large aperture continuous vari-focus of the utility model LONG WAVE INFRAREDCamera lens has good image quality.

Above embodiment is only in order to illustrate the utility model and the described technical scheme of unrestricted the utility model. CauseThis, is although this description has been described in detail the utility model with reference to the above embodiments,, this area generalLogical technical staff should be appreciated that still and can modify or be equal to replacement the utility model; And all do not depart from this practicalityThe technical scheme of novel spirit and scope and improvement thereof, it all should be encompassed in the middle of claim scope of the present utility model.

Claims (5)

1. the universal large aperture continuous magnification lens of LONG WAVE INFRARED, is characterized in that: comprised successively to image space by object space, and frontFixing group, zoom group, compensation group, latter fixing group, focusing group and long wave uncooled detector;

Described first fixing group has positive light coke, for a slice convex surface is towards the falcate germanium single crystal positive lens of object space, surface typeBe sphere;

Described zoom group has negative power, is a slice double concave germanium single crystal negative lens, and its side towards image space is aspheric surface,Total shift motion 27.33mm of described lens;

Described compensation group has positive light coke, is the lenticular germanium single crystal positive lens of a slice, and its side towards object space is aspheric surface,Total shift motion 28.49mm of described lens;

Described latter fixing group has negative power, and for a slice convex surface is towards the falcate germanium single crystal negative lens of image space, its concave surface isDiffraction surfaces;

Described focusing group has positive light coke, is the lenticular germanium single crystal positive lens of a slice, and its side towards object space is aspheric surface,Total shift motion 3mm of described lens;

After described focusing group, be long wave uncooled detector, comprise protecting window and image planes, aperture diaphragm be positioned at compensation group withBetween rear fixing group, in zoom process, keep constant;

Described camera lens meets following parameter:

Effective focal length EFL=20～the 100mm of described camera lens, F number=0.8f20mm, F number=1.0f100mm, optical systemOverall length=210mm, adaptive detector resolution 640x512, Pixel size 15 μ m, horizontal field of view angular region is: 2 ω=27 °～5.5°。

2. the universal large aperture continuous magnification lens of LONG WAVE INFRARED according to claim 1, is characterized in that described camera lensEyeglass in aspheric surface meet following expression formula:

Wherein z is aspheric surface along optical axis direction when highly for the position of r, apart from the distance rise on aspheric surface summit, and c presentation surfaceVertex curvature, k is circular cone coefficient, α₂、α₃、α₄、α₅、α₆For high order aspheric surface coefficient.

3. the universal large aperture continuous magnification lens of LONG WAVE INFRARED according to claim 1, is characterized in that described camera lensEyeglass in diffraction surfaces meet following expression formula:

Φ＝A₁ρ²+A₂ρ⁴

The position phase that wherein Φ is diffraction surfaces, ρ=r/r_n，r_nThe planning radius of diffraction surfaces, A₁、A₂For the phase coefficient of diffraction surfaces.

4. the universal large aperture continuous magnification lens of LONG WAVE INFRARED according to claim 1, is characterized in that described camera lensThe average MTF of full visual field > 0.4520lp/mm.

5. the universal large aperture continuous magnification lens of LONG WAVE INFRARED according to claim 1, is characterized in that, described front solidThe lens S1 plated surface diamond-like-carbon rete of fixed group, the lens S2 of described first fixing group, the lens S3 of zoom group and S4, compensationAntireflective coating is all plated on lens S9 and the S10 surface of the lens S5 of group and S6, the lens S7 of latter fixing group and S8, focusing group.