CN1752790A - Varifocus camera lens - Google Patents

Abstract

The present invention discloses a miniaturized variable-focus lens, specially it is applicable to the field of handset with shooting function or miniature digital camera. From object space to image space it successively includes first lens group of negative diopter, second lens group of negative diopter and third lens group of positive diopter, in which the first lens group position is fixed, the distance between second lens group and first lens group is changed so as to make the focal distance of whole lens be changed, and the change of third lens group position can be used for compensating the imaging face movement resulted after the focus is changed, so that the position of imaging face can be fixed always, and is not changed.

Description

Zoom lens

[technical field]

The present invention relates to a kind of zoom lens, refer in particular to a kind of have vista shot and wide viewing angle shoot function, be applicable to the ultrashort microminiaturized zoom lens of light weight of size of camera mobile phone, miniature digital camera.

[background technology]

Different with adjustable focus, the Varifocal zoom lens of traditional camera, video camera and general digital camera, be subjected to the qualification of handset size, the size of employed photographic lens is much smaller in the camera mobile phone, structure is also simple a lot, and majority all is tight shots, its scope that can take is especially far away, shooting at close range has certain limitation, can't resemble to obtain best shooting effect by focusing, zoom the traditional camera.As Chinese utility model patent the 01272836.5th, 01273098.X, 02218484.8, No. 03220711.5 and United States Patent (USP) the 6th, 650,486,6,741, No. 405 a kind of tight shot structure that is applicable to camera mobile phone is disclosed all.

Yet development along with technology, people are more and more higher to the quality requirements of mobile phone filmed image, though in recent years by improving employed CCD (Charge Coupled Device in the camera mobile phone, the sensitization coupling element), CMOS (Complementary Metal-Oxide Semiconductor, complementary matal-oxide semiconductor) Image Sensor technology such as, the image quality that makes the camera mobile phone shooting is from 100,000 pixels, 350,000 pixels are increased to the level of 1,300,000 pixels even 2,000,000 pixels, but because the employed camera lens of camera mobile phone almost is tight shot, its fixed focal length, the visual angle of camera lens is just fixing, must the follow shot distance in the time will taking subrange scenery, it is very inconvenient to use, and if adopt Digital Zoom can reduce the image quality of image.Therefore, adopt camera lens to be still the first-selection of present camera mobile phone with optical zoom function.

Industrial community is no lack of the design proposal of microminiaturized zoom lens at present, for example Canon (Canon) company gets permission to announce the United States Patent (USP) the 6th February 20 calendar year 2001,191, No. 896 and announce in the United States Patent (USP) the 6th in May 15 calendar year 2001,233, No. 099, just disclosed a kind of have negative, positive, just reach the zoom lens of four lens combination of positive diopter, reach the focal length adjustment that far away, near-sighted angle is taken by the distance that changes between first and second and three lens combination.Be to apply for and be disclosed in the Chinese invention patent application on February 5th, 2003 disclosing CN1395144A number equally by Canon Inc., also disclosed a kind of zoom lens of microminiaturization, it comprises negative dioptric first lens combination, second lens combination of a positive diopter and the 3rd lens combination of stationkeeping from the object side to the image side successively, reaches Zoom effect by the distance that changes between first lens combination and second lens combination.Yet; above-mentioned existing zoom lens is changed to long sight angle or near-sighted angle shooting state at general shooting state; or during by the conversion of long sight angle myopia angle; the length dimension of whole camera lens will change along with the variation of shooting state; the zoom lens that this overall dimensions in use can change; for gauge obviously is unaccommodated for 20mm even the littler mobile phone only; on the one hand be that camera lens is difficult to pack in the mobile phone mechanism part; the 2nd, mobile phone carries and uses situations such as having friction, collision often, and the change of Lens is easy to make the camera lens accident impaired.And the employed eyeglass of aforementioned existing zoom lens at least also has more than six, and except that production cost increased, its weight more also was a puzzlement.

According to another title, Philip (Philips) company researchs and develops out the microminiaturized liquid lens that a kind of suitable mobile phone uses, it is that liquid immiscible with two kinds and that have a different refractivity injects a transparent column shape container, by apply voltage adjust with the conversion container in the polarity of two kinds of liquid, and then change two kinds of interface kenels between the liquid by capillary variation, thereby reach the purpose of deviation light, and focus by changing voltage swing and polarity.But this product still remains further test at the indexes such as stability, image quality and serviceable life of use, will carry out scale of mass production in a short time and use still has sizable difficulty.

Therefore, research and develop and a kind ofly be suitable for that camera mobile phone uses, have the short and small lightweight Zoom optic lens of vista shot and wide viewing angle shoot function and size, be still the urgent reality technology demand that industrial community faces.

[summary of the invention]

The object of the present invention is to provide that a kind of size is ultrashort, less number of lenses and compact conformation, have vista shot and wide viewing angle shoot function, and a zoom lens of optical imagery function admirable.

The objective of the invention is to be achieved through the following technical solutions: a kind of zoom lens, it comprises negative dioptric first lens combination from the object side to the image side successively, the 3rd lens combination of negative dioptric second lens combination and positive diopter, wherein be used to receive the first lens combination stationkeeping of light, the 3rd lens combination that is used for second lens combination of zoom and affords redress is removable, change the distance between second lens combination and first lens combination and make the focal length variations of whole camera lens, and compensate the imaging surface that causes behind the zoom by the change of the 3rd lens combination position and move, the position of imaging surface is remained immobilize.

According to the zoom lens that purpose of the present invention provided, it satisfies following relational expression:

$0.27<\frac{f_{\mathrm{bw}}}{\mathrm{TT}}<0.35---(a-1)$

Wherein, f _BwBe the back focal length degree (Back Focal Length at Wide Angle End) of wide-angle side, TT is optical track mark total length (Total Optical Track).

Zoom lens according to purpose of the present invention provided, wherein satisfy the following relationship formula between second lens combination and the 3rd lens combination:

$1.7<\frac{f_2}{{\mathrm{<figure-callout\; id="3"\; label="f"\; filenames="A20041007889500161.png,A20041007889500162.png"\; state="\{\{state\}\}">f</figure-callout>}}_3}<2.9---(a-2)$

Wherein, f ₂Be the focal length of second lens combination, f ₃It is the focal length of the 3rd lens combination.According to the zoom lens that purpose of the present invention provided, it also satisfies the following relationship formula:

$0.16<\frac{I_C}{\mathrm{TT}}<2.2---(a-3)$

Wherein, I _cBe into the radius (Radius ofan Image Circle) of image circle, TT is optical track mark total length (Total Optical Track).

According in the zoom lens that purpose of the present invention provided, second lens combination comprises negative dioptric zoom lens, and the surface of these zoom lens one side towards the surface of object space one side and towards picture side is sphere.

According in the zoom lens that purpose of the present invention provided, the 3rd lens combination comprises a positive lens and a negative lens, and it is aspheric surface that this positive lens and this negative lens respectively have at least one surface.

According in the zoom lens that purpose of the present invention provided, first lens combination comprises a negative dioptric receipts optical lens, and at least one surface of this receipts optical lens is an aspheric surface.

According in the zoom lens that purpose of the present invention provided, above-mentioned aspheric surface can be by following aspheric surface equation expression:

$z=\frac{{\mathrm{<figure-callout\; id="2"\; label="ch"\; filenames="A20041007889500161.png,A20041007889500162.png"\; state="\{\{state\}\}">ch</figure-callout>}}^2}{1+{[1-(k+1)c^2{h}^2]}^{\frac{1}{2}}}+A{\mathrm{<figure-callout\; id="4"\; label="h"\; filenames="A20041007889500161.png"\; state="\{\{state\}\}">h</figure-callout>}}^4+B{h}^6+C{h}^8+\mathrm{<figure-callout\; id="10"\; label="D\; h"\; filenames="A20041007889500161.png,A20041007889500222.png"\; state="\{\{state\}\}">D</figure-callout>}{h}^{}{}^{10}$

Wherein, z be along optical axis direction highly for the position of h with the surface vertices shift value apart from optical axis for referencial use; K is the tapering constant; C=l/r, r represent the paraxial radius-of-curvature; A, B, C, D are the high-order asphericity coefficient.

Compared with prior art, zoom lens of the present invention adopts negative, negative, positive three lens group structures, and make the stationkeeping of first lens combination and imaging surface constant, by the distance between first and second lens combination of position change that changes negative dioptric second lens combination, and reach the effect of zoom, and move with the image planes that the 3rd lens combination compensation causes because of zoom, guarantee that imaging is clear.The less number of lenses of whole zoom lens, compact conformation, size even can be reduced to 9mm, and optical zoom still reaches near 2 times, and under so short total elongate member, still have enough back Jiao, and have good optical property.In addition, adopt aspherical lens can also effectively correct aberration and guarantee that the quality of image is good.Therefore, zoom lens of the present invention meets the requirement of scale of mass production, has good market outlook.

[description of drawings]

Fig. 1 is the optical system synoptic diagram of zoom lens of the present invention when being in the vista shot state.

Fig. 2 is the optical system synoptic diagram of zoom lens of the present invention when being in general shooting state.

Fig. 3 is the optical system synoptic diagram of zoom lens of the present invention when being in the wide viewing angle shooting state.

Fig. 4 is the spherical aberration of the zoom lens of first group of numerical value enforcement of foundation in wide-angle side.

Fig. 5 is the astigmatism of the zoom lens of first group of numerical value enforcement of foundation in wide-angle side.

Fig. 6 is the lateral chromatic aberration of the zoom lens of first group of numerical value enforcement of foundation in wide-angle side.

Fig. 7 is that the zoom lens implemented according to first group of numerical value is in the spherical aberration of end of dolly-out,ing dolly-back.

Fig. 8 is that the zoom lens implemented according to first group of numerical value is at the astigmatism of end of dolly-out,ing dolly-back.

Fig. 9 is that the zoom lens implemented according to first group of numerical value is in the lateral chromatic aberration of end of dolly-out,ing dolly-back.

Figure 10 is the spherical aberration of the zoom lens of second group of numerical value enforcement of foundation in wide-angle side.

Figure 11 is the astigmatism of the zoom lens of second group of numerical value enforcement of foundation in wide-angle side.

Figure 12 is the lateral chromatic aberration of the zoom lens of second group of numerical value enforcement of foundation in wide-angle side.

Figure 13 is that the zoom lens implemented according to second group of numerical value is in the spherical aberration of end of dolly-out,ing dolly-back.

Figure 14 is that the zoom lens implemented according to second group of numerical value is at the astigmatism of end of dolly-out,ing dolly-back.

Figure 15 is that the zoom lens implemented according to second group of numerical value is in the lateral chromatic aberration of end of dolly-out,ing dolly-back.

[embodiment]

See also the optical system synoptic diagram of zoom lens of the present invention shown in Figure 1, this zoom lens comprises the 3rd lens combination 3 of negative dioptric first lens combination 1, negative dioptric second lens combination 2 and positive diopter from the object side to the image side successively.Wherein, this first lens combination 1 comprises a negative dioptric receipts optical lens 10, and this receipts optical lens 10 can adopt the optical plastic mould model, and what it was fixed on camera lens is used to receive light foremost.This receipts optical lens 10 is aspherical lens, and promptly its at least one surface is an aspheric surface.In the specific implementation, its first surface 11 towards object space one side can adopt the slightly aspheric surface of microprotrusion, 12 of opposing second surface are the aspheric surfaces to the object space depression, adopt this receipts optical lens 10 can make zoom lens of the present invention visual angle when the wide-angle state can reach 65.3 degree.

Second lens combination 2 is used to change lens focus, it comprises negative dioptric zoom lens 20, these zoom lens 20 adopt optical glass material, so that better optical quality can be arranged, and it is sphere towards the first surface 21 of object space one side and the second surface 22 of relative opposite side, makes the tolerance tolerance of the whole optical system of zoom lens of the present invention obtain to promote significantly whereby.For this type of minisize optical lens that is used for camera mobile phone or ultrashort type digital camera, have suitable difficulty by accurately moving of interior lens to carry out zoom, therefore have big tolerance tolerance and be one of important key element that can whole zoom lens optical system volume production.

The 3rd lens combination 3 moves in order to compensation imaging surface 6 positions that zoom caused, guarantees that the position of imaging surface 6 immobilizes all the time, incident ray still can be focused on the imaging surface 6 of fixed position and obtains sharp image.The 3rd lens combination 3 comprises a positive lens 31 and a negative lens 32 successively from object space to picture side, the model aspherical lens that this positive lens 31 is plastic materials, it has at least a surface to be aspheric surface in the second surface 312 of the first surface 311 of object space one side and relative opposite side.Equally, negative lens 32 also is the model aspherical lens of a plastic material, and it has at least a surface to be aspheric surface in the second surface 322 of the first surface 321 of object space one side and relative opposite side.The focal length of this positive lens 31 be on the occasion of, to compensate first lens combination 1 and the back burnt change amount that this negative lens 32 is caused under different temperatures, make zoom lens of the present invention under different temperatures, can also obtain the good picture of separating.Also as the compensation of the curvature of field, by the aspheric surface characteristic of these positive and negative lens 31,32, the optics that can further improve whole camera lens is separated picture to this positive lens 31 in addition.

In addition, between this second lens combination 2 and the 3rd lens combination 3, be provided with aperture 5, be provided with zero diopter glass mirror 4 (or infrared filter) at second surface 322 close positions of the negative lens 32 of the 3rd lens combination 3 with control light amount of incident.First lens combination 1 of zoom lens of the present invention and imaging surface 6 stationkeeping, thereby the total length of whole camera lens is fixed, make camera lens be convenient to be assembled in mechanism's part of mobile phone, and be reduced in that mobile phone carries and use in the risk damaged by external force accident collision of camera lens.Carry out zoom by moving the distance that second lens combination 2 changes 1 of itself and first lens combination, moving of the imaging surface 6 that cause because of zoom with compensation the position of adjusting the 3rd lens combination 3 simultaneously, can transfer general shooting state shown in Figure 2 to by shadow shooting state far away shown in Figure 1, and then transfer closely wide viewing angle shooting state shown in Figure 3 to.

Employed less number of lenses of zoom lens of the present invention and compact conformation adopt the fixing inside zoom mode of length overall, and its overall length can be reduced to 9mm, and camera lens still has enough back Jiao under so short total length condition.For this reason, under a preferable enforcement state, zoom lens of the present invention satisfies following relational expression:

$0.27<\frac{f_{\mathrm{bw}}}{\mathrm{TT}}<0.35---(a-1)$

Wherein, f _BwBe the back focal length degree (Back Focal Length at Wide Angle End) of wide-angle side, TT is optical track mark total length (Total Optical Track).When the ratio of this (a-1) formula is prescribed a time limit on the lower side, easily produce the burnt deficiency in back, can make camera lens not have enough spaces to place infrared filter (IR Filter) or zero diopter glass mirror 4.Prescribe a time limit on the upper side and work as (a-1) formula ratio, it is excessive to be easy to generate the angle that is incident to imaging surface, has resulted in shade (Shading) phenomenon.

In addition, under the ultrashort situation of zoom lens total length, its optical zoom still can reach 2 times nearly.Satisfy the following relationship formula between second lens combination 2 of zoom lens of the present invention and the 3rd lens combination 3 for this reason:

$1.7<\frac{f_2}{{\mathrm{<figure-callout\; id="3"\; label="f"\; filenames="A20041007889500161.png,A20041007889500162.png"\; state="\{\{state\}\}">f</figure-callout>}}_3}<2.9---(a-2)$

Wherein, f ₂Be the focal length of second lens combination 2, f ₃It is the focal length of the 3rd lens combination 3.Prescribe a time limit on the lower side when the ratio of above-mentioned (a-2) formula, represent that the 3rd lens combination 3 is little with respect to the magnification of second lens combination 2, in the zoom process the distance that must move increase relatively to some extent.Prescribe a time limit on the upper side when the ratio of (a-2) formula, represent the 3rd lens combination 3 big, in the zoom process, may cause the increase of aberration with respect to the magnification of second lens combination 2.

In addition, for obtaining 2 times optical zoom nearly, zoom lens of the present invention also satisfies the following relationship formula in ultrashort space:

$0.16<\frac{I_C}{\mathrm{TT}}<2.2---(a-3)$

Wherein, I _CBe into the radius (Radius of an Image Circle) of image circle, TT is optical track mark total length (Total Optical Track).When the ratio of (a-3) formula is prescribed a time limit on the lower side, represent that lay the grain track total length is long relatively; Prescribe a time limit on the upper side when the ratio of (a-3) formula, be easy to generate the quick increase of amount of distortion and be incident to the angle of imaging surface excessive.

The receipts optical lens 10 of zoom lens of the present invention and the positive lens 31 of the 3rd lens combination 3, negative lens 32 all adopt aspheric surface, make zoom lens have preferable aberration correction.If adopt spheric glass, then need longer space the aberration of compound lens when correcting zoom is set, so the present invention adopts aspherical lens, can reduce the eyeglass number of camera lens and reduce the camera lens length overall.The positive lens 31 of aforementioned receipts optical lens 10 and the 3rd lens combination 3, the aspheric surface of negative lens 32 can be used following formulate:

$z=\frac{{\mathrm{<figure-callout\; id="2"\; label="ch"\; filenames="A20041007889500161.png,A20041007889500162.png"\; state="\{\{state\}\}">ch</figure-callout>}}^2}{1+[1-(k+1)c^2{h}^2{]}^{1/2}}+\mathrm{<figure-callout\; id="4"\; label="A\; h"\; filenames="A20041007889500161.png"\; state="\{\{state\}\}">A</figure-callout>}{h}^{}{}^4+B{h}^6+C{h}^8+\mathrm{<figure-callout\; id="10"\; label="D\; h"\; filenames="A20041007889500161.png,A20041007889500222.png"\; state="\{\{state\}\}">D</figure-callout>}{h}^{}{}^{10}$

Wherein, z be along optical axis direction highly for the position of h with the surface vertices shift value apart from optical axis for referencial use; K is the tapering constant; C=l/r, r represent the paraxial radius-of-curvature; A, B, C, D are the high-order asphericity coefficient.

According to aforementioned technology contents of the present invention, can specifically implement according to following first group of numerical value:

First group of numerical value embodiment

The surface sequence number	Radius-of-curvature (mm) (Radius)	Thickness/at interval (mm) (Thickness)	Refractive index (Nd)	Abbe coefficient (Vd)	Conicity (Conic)
						1	470.0012	0.5	1.5435	56.8	0
2	2.239547	Variable spacing 1			-1
						3	-9.084144	0.8	1.62041	60.3	0
4	-3.941202	0.1			0
						5 (apertures)	Infinitely great	Variable spacing	2			0
6	1.396086	1.4	1.5435	56.8	-1.239444
						7	-4.89327	0.2			30.82663
8	-2.31207	0.45	1.5854	29.1	-1
						9	4.04246	0.3			23.45668
10	Infinitely great	Variable spacing 3

Wherein:

	Maximum wide-angle state (Maximum wide-angle state)	Maximum distant view shooting state (Maximum telephoto state)
			Variable spacing 1	2.8533	0.8389

Variable spacing 2	0.09	0.7805
			Variable spacing 3	2.471	3.795
Effective focal length	2.574	4.566
			F-number (F number)	2.9	3.95

In addition, the concrete numerical value such as the following table of asphericity coefficient are listed:

The zoom lens of the present invention that the above-mentioned first group of numerical value of foundation is implemented, the receipts optical lens 10 of first lens combination 1 is the double-sized non-spherical eyeglass, zoom lens 20 are spheric glass, and the positive lens 31 of the 3rd lens combination 3 is the double-sized non-spherical eyeglass, and the second surface 322 of negative lens 32 is an aspheric surface.Aforementioned (a-1) formula, (a-2) formula reach (a-3), and the ratio of formula is respectively: f _BW/ TT=0.28, f ₂/ f ₃=2.69, I _c/ TT=0.18.The zoom lens that obtains according to first group of numerical value embodiment to the present invention shown in Figure 9 as Fig. 4 shows that in spherical aberration, astigmatism and the lateral chromatic aberration of different conditions the zoom lens that the present invention implements according to first group of numerical value has the good optical performance.

Zoom lens of the present invention also can specifically be implemented according to following second group of numerical value:

Second group of numerical value embodiment

The surface sequence number	Radius-of-curvature (mm) (Radius)	Thickness/at interval (mm) (Thickness)	Refractive index (Nd)	Abbe coefficient (Vd)	Conicity (Conic)
						1	223.2092	0.5	1.5435	56.8	8620.948
2	2.090871	Variable spacing 1			-1

3	-6.26885	0.7	1.62041	60.3	0
						4	-3.043807	0.1			0
5 (apertures)	Infinitely great	Variable spacing 2			0
						6	1.344059	1.023999	1.5435	56.8	-1.490568
7	-4.400221	0.1500616			17.33977
						8	-2.357824	0.45	1.5854	29.1	-7.413299
9	3.07069	0.3			16.27429
						10	Infinitely great	Variable spacing 3

Wherein:

	Maximum wide-angle state (Maximum wide-angle state)	Maximum distant view shooting state (Maximum telephoto statte)
			Variable spacing 1	2.976	1.023
Variable spacing 2	0.07	0.408
			Variable spacing 3	2.903	4.463
Effective focal length	2.544	4.789
			F-number (F number)	2.87	4.147

In addition, the concrete numerical value such as the following table of asphericity coefficient are listed:

According to the zoom lens of the present invention that above-mentioned first group of numerical value is implemented, the receipts optical lens 10 of first lens combination 1 is the double-sized non-spherical eyeglass, and zoom lens 20 are spheric glass, and the positive lens 31 of the 3rd lens combination 3 reaches and is the double-sized non-spherical eyeglass for negative lens 32.Aforementioned (a-1) formula, (a-2) formula reach (a-3), and the ratio of formula is respectively: f _BW/ TT=0.33, f ₂/ f ₃=1.97, I _c/ TT=0.19.The zoom lens that obtains according to second group of numerical value to the present invention shown in Figure 15 as Figure 10 shows that in spherical aberration, astigmatism and the lateral chromatic aberration of different conditions the zoom lens that the present invention implements according to second group of numerical value has the good optical performance equally.

Claims (24)

1. zoom lens, it is characterized in that: described zoom lens comprises negative dioptric first lens combination from the object side to the image side successively, the 3rd lens combination of negative dioptric second lens combination and positive diopter, wherein be used to receive the first lens combination stationkeeping of light, the 3rd lens combination that is used for second lens combination of zoom and affords redress is removable, change the distance between second lens combination and first lens combination and make the focal length variations of whole camera lens, and change the 3rd lens combination position and compensate the imaging surface that causes behind the zoom and move, the position of imaging surface is remained immobilize.

2. zoom lens as claimed in claim 1 is characterized in that: described second lens combination comprises negative dioptric zoom lens, and the surface of these zoom lens one side towards the surface of object space one side and towards picture side is sphere.

3. zoom lens as claimed in claim 2 is characterized in that: described the 3rd lens combination comprises a positive lens, and at least one surface of this positive lens is an aspheric surface.

4. zoom lens as claimed in claim 3 is characterized in that: described the 3rd lens combination also comprises a negative lens adjacent with described positive lens, and at least one surface of this negative lens is an aspheric surface.

5. zoom lens as claimed in claim 4 is characterized in that: described first lens combination comprises a negative dioptric receipts optical lens, and at least one surface of this receipts optical lens is an aspheric surface.

6. zoom lens as claimed in claim 5 is characterized in that: described aspheric surface satisfies following formula:

$z=\frac{{\mathrm{ch}}^2}{1+{[1-(k+1)c^2{h}^2]}^{\frac{1}{2}}}+{\mathrm{Ah}}^4+{\mathrm{Bh}}^6+{\mathrm{Ch}}^8+{\mathrm{Dh}}^{10}$

Wherein, z be along optical axis direction highly for the position of h with the surface vertices shift value apart from optical axis for referencial use; K is the tapering constant; C=1/r, r represent the paraxial radius-of-curvature; A, B, C, D are the high-order asphericity coefficient.

7. as claim 1 or 6 described zoom lens, it is characterized in that: described camera lens satisfies following relational expression:

$0.27<\frac{f_{\mathrm{bw}}}{\mathrm{TT}}<0.35$

Wherein, f _BwBe the back focal length degree of wide-angle side, TT is an optical track mark total length.

8. zoom lens as claimed in claim 7 is characterized in that: satisfy the following relationship formula between described second lens combination and the 3rd lens combination:

$1.7<\frac{f_2}{f_3}<2.9$

Wherein, f ₂Be the focal length of second lens combination, f ₃It is the focal length of the 3rd lens combination.

9. zoom lens as claimed in claim 8 is characterized in that: this camera lens also satisfies the following relationship formula:

$0.16<\frac{I_C}{\mathrm{TT}}<2.2$

Wherein, I _CBe into the radius of image circle, TT is an optical track mark total length.

10. zoom lens as claimed in claim 1 is characterized in that: further be provided with aperture between described second lens combination and the 3rd lens combination.

11. zoom lens as claimed in claim 1 is characterized in that: also be provided with one of them of zero diopter glass mirror and infrared filter between described the 3rd lens combination and the imaging surface.

12. zoom lens as claimed in claim 2 is characterized in that: the zoom lens of described second lens combination are the eyeglasses of glass material.

13. zoom lens as claimed in claim 3 is characterized in that: the positive lens of described the 3rd lens combination is the model aspherical lens of plastic material.

14. zoom lens as claimed in claim 4 is characterized in that: the negative lens of described the 3rd lens combination is the model aspherical lens of plastic material.

15. zoom lens as claimed in claim 5 is characterized in that: the receipts optical lens of described first lens combination is the model aspherical lens of plastic material.

16. zoom lens, it is characterized in that: described zoom lens comprises the 3rd lens combination of negative dioptric first lens combination, negative dioptric second lens combination and positive diopter from the object side to the image side successively, by changing the focal length that distance between second lens combination and first lens combination changes camera lens, and change the 3rd lens combination position and compensate the imaging surface that causes behind the zoom and move, the position of imaging surface is remained to immobilize, wherein, described zoom lens meets the following conditions:

$0.27<\frac{f_{\mathrm{bW}}}{\mathrm{TT}}<0.35----(a-1)$

$1.7<\frac{f_2}{f_3}<2.9----(a-2)$

$0.16<\frac{I_c}{\mathrm{TT}}<2.2----(a-3)$

F in described (a-1) formula _BwBe the back focal length degree of wide-angle side, TT is an optical track mark total length; F in described (a-2) formula ₂Be the focal length of second lens combination, f ₃It is the focal length of the 3rd lens combination; I in described (a-3) formula _CBe into the radius of image circle, TT is an optical track mark total length.

17. zoom lens as claimed in claim 16 is characterized in that: the stationkeeping of described first lens combination is constant, and described second lens combination and the 3rd lens combination are to move along optical axis direction.

18. zoom lens as claimed in claim 17 is characterized in that: described second lens combination comprises negative dioptric zoom lens, and the surface of these zoom lens one side towards the surface of object space one side and towards picture side is sphere.

19. zoom lens as claimed in claim 18 is characterized in that: described the 3rd lens combination comprises a positive lens, and at least one surface of this positive lens is an aspheric surface.

20. zoom lens as claimed in claim 19 is characterized in that: described the 3rd lens combination also comprises a negative lens adjacent with described positive lens, and at least one surface of this negative lens is an aspheric surface.

21. zoom lens as claimed in claim 20 is characterized in that: described first lens combination comprises a negative dioptric receipts optical lens, and at least one surface of this receipts optical lens is an aspheric surface.

22. zoom lens as claimed in claim 18 is characterized in that: the zoom lens of described second lens combination are the eyeglasses of glass material.

23. zoom lens as claimed in claim 21 is characterized in that: the receipts optical lens of described first lens combination, the positive lens of the 3rd lens combination and negative lens all are model aspherical lens of plastic material.

24. zoom lens as claimed in claim 23, wherein said aspheric surface satisfies following formula:

$z=\frac{{\mathrm{ch}}^2}{1+{[1-(k+1)c^2{h}^2]}^{\frac{1}{2}}}+{\mathrm{Ah}}^4+{\mathrm{Bh}}^6+{\mathrm{Ch}}^8+{\mathrm{Dh}}^{10}$

Wherein, z be along optical axis direction highly for the position of h with the surface vertices shift value apart from optical axis for referencial use; K is the tapering constant; C=1/r, r represent the paraxial radius-of-curvature; A, B, C, D are the high-order asphericity coefficient.

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