CN100385283C - Wide angle imaging lens - Google Patents

Abstract

A wide angle imaging lens is provided and includes, in order from an object side, four lenses of a first lens of a negative meniscus lens having a convex surface on the object side, a negative second lens having a concave surface on an image side and constituting at least one of both surfaces by an aspherical surface, a positive third lens having a convex surface on the object side and constituting at least one of both surfaces by an aspherical surface, and a fourth lens having a convex surface on the image side and constituting at least one of both surfaces by an aspherical surface. Further, Abbe numbers of the respective first to fourth lenses with respect to d line are respectively set to be equal to or larger than 40, equal to or larger than 50, equal to or smaller than 40 and equal to or larger than 50, and an aperture diaphragm is arranged between the third lens and the fourth lens.

Description

Wide-angle imaging lens

Technical field

The present invention relates to a kind of camera for monitoring that is used in imaging apparatuss such as having CCD or CMOS or portable telephone with the first-class wide-angle imaging lens of shooting, relate in particular to the vehicle video camera of the image at the place ahead of taking automobile or side, rear etc.

Background technology

The imaging lens system that is used for vehicle-mounted vidicon, in order to guarantee good visual field on a large scale whole, need the good lens of imaging aberration characteristic wide-angle and whole active area, and, owing to the restricted lens that need small-sized and light weight of the installing space of video camera in vehicle.

As this wide-angle imaging lens in the past, have as everyone knows and put down in writing in for example following patent documentation 1,2.

Patent documentation 1: the open 2003-307674 communique of Jap.P.;

Patent documentation 2: the open 2003-232998 communique of Jap.P..

Recently, especially to being installed on the wide-angle imaging lens of vehicle-mounted vidicon, when requirement can keep the good optical performance, more miniaturization, lightweight.

But the wide-angle imaging lens of being put down in writing in the above-mentioned patent documentation 1,2 can't satisfy above-mentioned requirements.Though this wide-angle imaging lens can be guaranteed brightness, because based on nearly 5～6 of glass spherical lens, lens numbers, so be difficult to satisfy above-mentioned requirements aspect size and the weight.

And, utilize non-spherical lens in addition and reduce constitute lens quantity to seek miniaturization, light-weighted wide-angle imaging lens, but in the existing wide-angle imaging lens that utilizes non-spherical lens, not too satisfied on aspect the optical property, color scatter (the above-mentioned patent documentation 2 of reference) especially might take place in image because the revisal of multiplying power chromatic aberation is not enough.

A kind of flake wide-angle lens that comprises four lens elements is disclosed in the open 2005-227426 communique of disclosed Jap.P. on August 25th, 2005.

Summary of the invention

The present invention in view of the above problems, its purpose is, provides a kind of and can realize miniaturization more, light-weighted while, can obtain the good optical performance, the wide-angle imaging lens of the chromatic aberation of revisal multiplying power especially well.

In order to achieve the above object, wide-angle imaging lens of the present invention, utilize non-spherical lens to constitute with 4 lens, simultaneously, set the Abbe number that constitutes the material of the 1st, the 2nd and the 4th lens greatly, set the Abbe number that constitutes the material of the 3rd lens little, and, aperture diaphragm is disposed between the 3rd lens and the 4th lens.

That is, the wide-angle imaging lens relevant with the present invention is characterized in that: dispose following 4 lens successively and constitute from object side, it is respectively: the 1st lens, and make convex surface towards object side, and the meniscus shaped lens of the negative refraction that has; The 2nd lens make the less relatively concave surface of radius-of-curvature towards the picture side, and are aspheric surface at least simultaneously in the two sides, have negative refraction; The 3rd lens make the less relatively convex surface of radius-of-curvature towards object side, and are aspheric surface at least simultaneously in the two sides, have positive refraction; And the 4th lens, make the less relatively convex surface of its radius-of-curvature towards the picture side, and be aspheric surface at least simultaneously in the two sides, has positive refraction, and, the Abbe number for the d line that constitutes the material of above-mentioned the 1st lens is set at more than 40, the Abbe number for the d line of the material of above-mentioned the 2nd lens of formation is set at more than 50, the Abbe number for the d line of the material of above-mentioned the 3rd lens of formation is set at below 40, the Abbe number for the d line of the material of above-mentioned the 4th lens of formation is set at more than 50, disposes aperture diaphragm between above-mentioned the 3rd lens and above-mentioned the 4th lens.

In the present invention, the difference for the Abbe number of d line for the Abbe number of d line and the material that constitutes the 3rd lens that preferably constitutes the material of the 2nd lens is set at more than 20, and each two sides of the 2nd lens, the 3rd lens and the 4th lens preferably is aspheric surface.And, on the face as side of the 1st lens, forming antireflection film, this antireflection film is preferably more than the 150nm near the thickness the optical axis, below the 225nm.

And, the intersection point of the outer outermost light of the axle of the outer most edge of effective diameter that will be by this wide-angle imaging lens and the face of above-mentioned object side is made as Z5 on the summit of the face of the object side of optical axis direction coordinate and the 3rd lens in the difference of optical axis direction coordinate when setting axes of coordinates (on system-wide optical axis the coordinate at above-mentioned axes of coordinates), with above-mentioned as side face and the intersection point of above-mentioned outermost light optical axis direction coordinate and the 3rd lens as the summit of the face of side when the difference of optical axis direction coordinate is made as Z6, the formula that preferably meets the following conditions (1):

|Z5/Z6|＞3 ...(1)

And, the distance from the face of the object side of the 1st lens to imaging surface is made as L, will from the 4th lens as the face of side when the distance of imaging surface is made as d8, the formula that preferably meets the following conditions (2):

0.25＞d8/L＞0.13 ...(2)

But when having other optical components to get involved in light path, preferred d8 and L are set at the thickness with the optical axis direction of these other optical components and carry out that air converts and the distance of trying to achieve.

And the 2nd lens, the 3rd lens and the 4th lens preferably by the material of water-intake rate below 0.3%, are especially formed by plastic material.

As the optical material that satisfies above-mentioned various conditions, suitable material is as follows: the material as the 2nd lens and the 4th lens for example has polyolefin-based resins, as the material of the 3rd lens polycarbonate-based resin is for example arranged.

And, preferably, this wide-angle imaging lens formula (4) that satisfies condition:

0.10＜f/D＜0.22 ...(4)

Wherein f represents the focal length of described wide-angle imaging lens total system, and D representative from described the 1st lens at the face of object side to the distance of described the 4th lens at the face of picture side.

And, preferably, this wide-angle imaging lens satisfy condition formula (5) and (6):

-0.9＜f/f ₂＜-0.4 ...(5)

0.3＜f/f ₃＜0.8 ...(6)

F wherein ₂Represent the focal length of described the 2nd lens, and f ₃Represent the focal length of described the 3rd lens.

" optical thickness " in this instructions means the product of n and t, and wherein n represents the refractive index at membrane material d line place, and t represents the physical thickness of film.

According to the wide-angle imaging lens relevant with the present invention, owing to constitute by 4 lens, so can realize miniaturization more, lightweight.And, as mentioned above, when constituting the face shape of each lens, be set at the Abbe number that constitutes each material of the 1st, the 2nd and the 4th lens bigger, the Abbe number that constitutes the material of the 3rd lens is set at less, and, aperture diaphragm is disposed between the 3rd lens and the 4th lens, thereby can keep the good optical performance, the chromatic aberation of revisal multiplying power especially well.

Description of drawings

Fig. 1 is the figure that the wide-angle imaging lens of expression an embodiment of the invention constitutes;

Fig. 2 is the figure that the wide-angle imaging lens of expression embodiment 1 constitutes;

Fig. 3 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 1;

Fig. 4 is the figure that the wide-angle imaging lens of expression embodiment 2 constitutes;

Fig. 5 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 2;

Fig. 6 is the figure that the wide-angle imaging lens of expression embodiment 3 constitutes;

Fig. 7 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 3;

Fig. 8 is the figure that the wide-angle imaging lens of expression embodiment 4 constitutes;

Fig. 9 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 4;

Figure 10 is the figure that the wide-angle imaging lens of expression embodiment 5 constitutes;

Fig. 11 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 5;

Figure 12 is the figure that the wide-angle imaging lens of expression embodiment 6 constitutes;

Figure 13 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 6;

Figure 14 is the figure that the wide-angle imaging lens of expression embodiment 7 constitutes;

Figure 15 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 7;

Figure 16 is the figure that the wide-angle imaging lens of expression embodiment 8 constitutes;

Figure 17 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 8;

Figure 18 is the figure that the wide-angle imaging lens of expression embodiment 9 constitutes;

Figure 19 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 9;

Figure 20 is the figure that the wide-angle imaging lens of expression embodiment 10 constitutes;

Figure 21 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 10;

Figure 22 is the figure that the wide-angle imaging lens of expression embodiment 11 constitutes;

Figure 23 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 11;

Figure 24 is the figure that the wide-angle imaging lens of expression embodiment 12 constitutes;

Figure 25 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 12.

Symbol description among the figure: L1～L4-lens, Z-optical axis, 1-outermost light beam, 2-shading member, other optical component of 3-, 4-imaging surface, 5-aperture diaphragm.

Embodiment

Below, with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.

Fig. 1 is the figure that the wide-angle imaging lens of expression first embodiment of the present invention constitutes.The wide-angle imaging lens of illustrated present embodiment, it is the vehicle-mounted vidicon that is applicable to the image at the place ahead of taking automobile or side, rear etc., dispose following 4 lens successively from object side: the 1st lens L1, make its convex surface towards object side, and the meniscus shaped lens with negative refraction; The 2nd lens L2 makes the less relatively concave surface of its radius-of-curvature towards the picture side, and is aspheric surface at least simultaneously in the two sides, has negative refraction; The 3rd lens L3 makes the less relatively convex surface of its radius-of-curvature towards object side, and is aspheric surface at least simultaneously in the two sides, has positive refraction; And the 4th lens L4, have positive refraction, make the less relatively convex surface of its radius-of-curvature towards the picture side, and in the two sides at least one side be aspheric surface.

And, the Abbe number that constitutes the material of the 1st lens L1 is (with respect to the d line, below all identical) Abbe number that is set at more than 40, constitutes the material of the 2nd lens L2 is set at 50 or more, the Abbe number that constitutes the material of the 3rd lens L3 is set at below 40, the Abbe number of the material of formation the 4th lens L4 is set at more than 50, disposes aperture diaphragm 5 between the 3rd lens L3 and the 4th lens L4.

In the wide-angle imaging lens of present embodiment, preferably, the difference of Abbe number and the Abbe number of the material that constitutes the 3rd lens L3 that constitutes the material of the 2nd lens L2 is set at more than 20, and each two sides of the 2nd lens L2, the 3rd lens L3 and the 4th lens L4 all becomes aspheric surface and is advisable.

And the face as side that preferred antireflection film is formed on the 1st lens L1 is advisable, and near the optical thickness of this antireflection film optical axis Z is more than the 150nm, below the 225nm.

And, in the wide-angle imaging lens of present embodiment, preferably constitute conditional (1), (2) (following record again) of satisfying in the summary of the invention to be put down in writing and be advisable:

|Z5/Z6|＞3 ...(1)

0.25＞d8/L＞0.13 ...(2)

And, as shown in Figure 1, Z5 represents: the outer most edge of the effective diameter by this wide-angle imaging lens (is represented 1/2 of the effective diameter of the face of the object side of the 3rd lens L3 with Y5, to represent with Y6 as 1/2 of the effective diameter of the face of side) the outer outermost light 1 of axle and the face of the object side of above-mentioned the 3rd lens intersection point the optical axis direction coordinate with poor at optical axis direction coordinate (axes of coordinates being set in optical axis Z when going up, the coordinate in above-mentioned axes of coordinates) of the summit of the face of the object side of the 3rd lens L3.In the same manner, Z6 represents: the summit of the face of the optical axis direction coordinate of the face of the picture side of above-mentioned the 3rd lens and the intersection point of above-mentioned outermost light 1 and the picture side of the 3rd lens L3 is poor the optical axis direction coordinate.And, in the wide-angle imaging lens of present embodiment, preferably, constitute in the formula of satisfying condition (4), (5) and (6) at least one.

0.10＜f/D＜0.22 ...(4)

-0.9＜f/f ₂＜-0.4 ...(5)

0.3＜f/f ₃＜0.8 ...(6)

In above-mentioned conditional, f represents the focal length of wide-angle imaging lens total system, and D represents from the distance of the face of the picture side of face to the four lens of the object side of first lens, f ₂The focal length of representing second lens, f ₃The focal length of representing the 3rd lens.

And as shown in Figure 2, L represents the distance on optical axis Z from the face of the object side of the 1st lens L1 to imaging surface 4 (roughly consistent with the sensitive surface of imaging apparatus), and d8 represents the distance on optical axis Z from the face of the picture side of the 4th lens L4 to imaging surface 4.But when having other optical components 3 (cover glass (comprising various light filters)) etc. of imaging apparatus to get involved in light path, d8 and L carry out the air conversion with the optical thickness of optical axis Z direction that will above-mentioned other optical components 3 and the distance setting of trying to achieve.

And, the 2nd lens L2 and the 4th lens L4 are preferably by the material of water-intake rate below 0.3% (for example, the plastic material of the polyolefin of water-intake rate below 0.01%) forms, the 3rd lens L3 preferably forms suitable by the material (for example, the polycarbonate-based plastic material of water-intake rate below 0.2%) of water-intake rate below 0.3%.

And shading member 2 is arranged at outside the effective diameter zone of face of picture side of the 1st lens L1 (with reference to Fig. 1).Above-mentioned shading member 2 for example is made of opaque sheet material or opaque coating etc.

Below, the meaning that so constitutes lens is described.

At first, relation between the allocation position of the Abbe number of the material that constitutes each lens and aperture diaphragm 5 is described, because the 1st lens L1 and the 2nd lens L2 as negative lens more approach object side than aperture diaphragm 5, so it is big more to constitute the Abbe number of each material of these negative lenses, the multiplying power chromatic aberation that takes place in the 1st lens L1 and the 2nd lens L2 is more little.But the Abbe number that no matter will constitute each material of the 1st lens L1 and the 2nd lens L2 is set at much, and the multiplying power chromatic aberation that takes place in the 1st lens L1 and the 2nd lens L2 also can never become 0.Therefore, though by the 3rd its multiplying power chromatic aberation of lens L3 revisal as positive lens, because the 3rd lens L3 is positioned at the object side of aperture diaphragm 5, so it is more little to constitute the Abbe number of material of the 3rd lens L3, revisal is just effective more.And, if it is too small to constitute the Abbe number of material of the 3rd lens L3, then became revisal, be set at below 40 and be advisable so constitute the difference of Abbe number and the Abbe number of the material that constitutes the 3rd lens L3 of the material of the 2nd lens L2.

On the other hand, constitute as the Abbe number of each material of the 1st lens L1 of negative lens and the 2nd lens L2 greatly more, and constitute as the Abbe number of the material of the 3rd lens L3 of positive lens more for a short time, axially chromatic aberation is big more.But, in the less lens of the focal length of the wide-angle imaging lens relevant with the present invention, because axially chromatic aberation is less to the influence of image quality, and that revisal becomes the multiplying power chromatic aberation of reason of aberration of picture is even more important, is set at as above-mentioned so will constitute the Abbe number of each material of each lens.And, the difference of Abbe number and the Abbe number of the material that constitutes the 3rd lens L3 that constitutes the material of the 2nd lens L2 is set at 20 when above, the revisal effect of multiplying power chromatic aberation will be more obvious.

And, when being arranged at aperture diaphragm 5 between the 2nd lens L2 and the 3rd lens L3, how the Abbe number that no matter will constitute the material of the 3rd lens L3 is set, the multiplying power chromatic aberation also takes place from the direction identical with the direction that takes place among the 1st lens L1 and the 2nd lens L2, so the multiplying power chromatic aberation that can not revisal takes place at the 1st lens L1 and the 2nd lens L2 is bigger thereby the multiplying power chromatic aberation will become.

On the other hand, when aperture diaphragm 5 is arranged at the picture side of the 4th lens L4, because the distance of the light beam of the face by each lens and optical axis Z becomes greatly, so be difficult to all aberrations of revisal, simultaneously, because lens combination becomes maximization, thereby miniaturization and and cost degradation are produced harmful effect.And, when being arranged at aperture diaphragm 5 between the object side of the 1st lens L1 or the 1st lens L1 and the 2nd lens L2, also be difficult to carry out the revisal of all aberrations in the same manner.

In view of the above problems, aperture diaphragm 5 is arranged between the 3rd lens L3 and the 4th lens L4, can realizes the good revisal of multiplying power chromatic aberation and miniaturization, lightweight and the cost degradation of lens combination thus.

And, when each two sides of the 2nd lens L2, the 3rd lens L3 and the 4th lens L4 is all set with aspheric surface, the total length of lens combination can be set at shortlyer, simultaneously, can also obtain good sharpness.

And, when the 2nd lens L2, the 3rd lens L3 and the 4th lens L4 are made of plastic lens, in the time of can be with the done with high accuracy aspherical shape, can also seek lightweight and cost degradation.

And, when the 2nd lens L2, the 3rd lens L3 and the 4th lens L4 are formed by the minimum material of water absorptivity, can suppress the performance degradation that produces owing to suction to greatest extent.

And, in the wide-angle imaging lens relevant, because the radius-of-curvature of the face of the picture side of the 1st lens L1 is less, so the tendency that has the optical thickness of the antireflection film of periphery to diminish than central portion with the present invention.At this moment, form antireflection film by face in the picture side of the 1st lens L1, this antireflection film is more than the 150nm, below the 225nm at its optical thickness of part near optical axis Z, thereby can on average reduce reflectivity in whole effective diameter zone, can reduce ghost image light thus.

And, if near the optical thickness of antireflection film the optical axis is littler than 150nm, then become too small and reflectivity long wavelength side uprises at the optical thickness of periphery, therefore little red ghost image takes place easily.On the contrary,, then become excessive and reflectivity short wavelength side uprises, so picture painted became redly, simultaneously, the ghost image of little green grass or young crops took place easily at the optical thickness of central portion if near the optical thickness of antireflection film the optical axis is bigger than 225nm.

And, when satisfying above-mentioned conditional (1), because the deterioration of the two sides of the 3rd lens L3 clear performance with the direction relativity shift of optical axis Z orthogonal the time diminishes, so the 3rd lens L3 need not have high element precision.

And in above-mentioned conditional (2), d8/L is lower than upward in limited time, and therefore all aberrations of revisal well can realize required optical property.

On the other hand, d8/L prescribes a time limit greater than following, all aberrations of revisal well, and can easily dispose lens combination, and can carry out miniaturization.

And, when in the formula of satisfying condition (4), (5) and (6) any one the time, can reduce manufacturing cost, realize further miniaturization and lightweight, and guarantee the suitable distance between the lens.The wide-angle imaging lens of the formula that satisfies condition (4) preferably satisfies condition formula (4 ') so that realize above-mentioned effect.

0.13＜f/D＜0.20 ...(4’)

When f/D is lower than going up in limited time in the conditional (4), can suitably dispose lens, and can not lean on too closely each other between the lens, and can cover parasitic light with suitable shape.Following prescribing a time limit in f/D greater than condition formula (4) can prevent that the visual angle from increasing.That is to say, can prevent that the radial dimension of the first lens L1 from excessively increasing, reduce manufacturing cost thus.

Work as f/f ₂Be lower than going up in limited time in the conditional (5), the negative capability that wide-angle imaging lens has is enough to obtain desirable visual angle, and first lens have the negative capability that is easy to make and in the radius-of-curvature of the second lens L2, one side.And the 3rd lens L3 has the positive ability that can reduce the multiplying power chromatic aberation.Work as f/f ₂Following prescribing a time limit in the greater than condition formula (5), the chromatic aberation of revisal multiplying power well, and second lens are easy to make.And, because the site error of the second lens L2 and the 3rd lens L3 can not influence the aberration of wide-angle imaging lens, so the position of the second lens L2 and the 3rd lens L3 needn't be set accurately.

Work as f/f ₃Be lower than going up in limited time in the conditional (6), the chromatic aberation of revisal multiplying power well, and second lens have based on the negative capability of making.And, because the site error of the second lens L2 and the 3rd lens L3 can not influence the aberration of wide-angle imaging lens, so the position of the second lens L2 and the 3rd lens L3 needn't be set accurately.Work as f/f ₃In the greater than condition formula (6) following in limited time, the chromatic aberation of revisal multiplying power well.

And, by the outer light beam of the effective diameter between the 1st lens L1 and the 2nd lens L2, reach imaging surface and form reason though become parasitic light,, can cut off this parasitic light by shading member 2 being arranged at the 1st lens L1 outside the effective diameter zone of the 2nd lens L2 side into ghost image.

And preferably, the second lens L2 has convex surface at object side.In this formation, reduce the distortion aberration of inconocenter part easily, and can obtain the less good image of core distortion aberration.Lens among the following embodiment 1,2,3,5,10,11 and 12 have this formation.Particularly, each lens among the embodiment 1,2,3,10,11 and 12 have significant convex shape, and satisfy r3/f＜10 (f: the focal length of total system, r3: near the radius-of-curvature the optical axis), have and be better than above-mentioned effect.

Below, utilize specific embodiment, illustrate in greater detail wide-angle imaging lens of the present invention.

(embodiment 1)

The formation of the wide-angle imaging lens of embodiment 1 as shown in Figure 2.

That is, as shown in the figure, the wide-angle imaging lens of embodiment 1 constitutes by dispose 4 lens successively from object side: make the 1st lens L1 of convex surface towards the negative meniscus lens of object side; Make the less relatively concave surface of its radius-of-curvature towards the picture side, and the two sides is the 2nd lens L2 of aspheric negative meniscus lens; Make the less relatively convex surface of its radius-of-curvature towards object side, and the two sides is aspheric the 3rd positive lens L3; Make the less relatively convex surface of its radius-of-curvature towards the picture side, and the two sides is aspheric the 4th positive lens L4.And, between the 3rd lens L3 and the 4th lens L4, dispose aperture diaphragm 5, and, other optical components 3 between the 4th lens L4 and imaging surface 4, disposed.

Below, to the concrete data of embodiment 1 expression.

On table 1, represent the radius of curvature R (being near locational radius-of-curvature optical axis Z during aspheric surface, the mm of unit) of each lens face of embodiment 1, axial vane surface interval (the central optical thickness of each lens and the airspace between each lens) D (mm), the refractive index Ne on the e of each lens line and the Abbe number ν d (also identical in table 2～table 12) on the d line of each lens in the lattice.And, (S-LAH66 of the 1st lens L1 is the ProductName of the glass material of the HARA of Co., Ltd. O system to the material name of each lens of also expression formation, the ZEONEX of the 2nd lens L2 and the 4th lens L4 is the registered trademark of Japanese ZEON Co., Ltd. system optical plastic material, and the PC of the 3rd lens L3 is a polycarbonate).And, the optical thickness dG (mm of unit) of other optical components 3 of expression and the refractive index NG on the e line, total system focal distance f in the middle lattice left side of table 1 ' (mm) and field angle 2 ω (degree).And expression is corresponding to the value of the above-mentioned conditional (1) among the embodiment 1, (2), (4), (5) and (6) in the middle lattice right side of table 1.

And expression is by represented each aspheric each asphericity coefficient (also identical in table 2～table 12) in the 2nd lens L2, the 3rd lens L3 and the 4th lens L4 of following formula (3) in the following lattice of table 1.

[table 1]

Face	R	D	Ne	νd
						1	16.5180	1.00	1.77621	49.6	S-LAH66
2	4.0021	1.04
						3	4.3048	1.00	1.51081	56.0	ZEONEX
4	0.6792	1.07
						5	1.4550	1.80	1.58820	30.3	PC
6	-9.2487	0.70
						7	4.4000	1.50	1.51081	56.0	ZEONEX
8	-1.7800

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	4.93106×10 -1	3.11250×10 -2	3.34960×10 -1	9.85617×10 -1	-1.85785×10 -1	-4.54439
A 3	1.33855×10 -2	2.12496×10 -2	2.84468×10 -2	-5.26308×10 -3	-2.27911×10 -2	-1.32221×10 -1
							A 4	-2.55505×10 -2	-7.18102×10 -3	-4.23538×10 -4	1.49422×10 -3	-1.12397×10 -1	6.73624×10 -2
A 5	4.21360×10 -3	-1.87570×10 -2	-2.63954×10 -2	-1.67487×10 -3	1.00763×10 -1	-2.97004×10 -2
							A 6	6.47862×10 -3	-2.47936×10 -3	-2.16364×10 -2	8.79408×10 -3	-4.22851×10- 2	2.83409×10 -2
A 7	-3.36051×10 -3	-2.27363×10 -4	8.99158×10 -3	2.65054×10 -2	3.32820×10 -3	-2.54398×10 -2
							A 8	4.50193×10 -4	-9.69888×10 -4	4.84380×10 -3	2.77513×10 -3	6.52299×10 -4	-7.08376×10 -4
A 9	0.00000	0.00000	0.00000	0.00000	4.41906×10 -3	2.59369×10 -3
							A 10	0.00000	0.00000	0.00000	0.00000	3.52663×10 -4	4.96388×10 -4

The aspheric surface formula

$Z=\frac{{\mathrm{<figure-callout\; id="2"\; label="Y"\; filenames="C20061000940900341.png"\; state="\{\{state\}\}">Y</figure-callout>}}^2/\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="C20061000940900301.png,C20061000940900381.png"\; state="\{\{state\}\}">R</figure-callout>}}{1+\sqrt{1-K\&times;{\mathrm{<figure-callout\; id="2"\; label="Y"\; filenames="C20061000940900341.png"\; state="\{\{state\}\}">Y</figure-callout>}}^2/{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="C20061000940900341.png"\; state="\{\{state\}\}">R</figure-callout>}}^2}}+\underset{i=3}{\overset{10}{\mathrm{\&Sigma;}}}{A}_i{Y}^i\&CenterDot;\&CenterDot;\&CenterDot;\left(3\right)$

Wherein,

Z: from the length of the point of optical axis on the aspheric surface of Y to the vertical line in the section (perpendicular to the plane of optical axis) on aspheric surface summit;

Y: apart from the distance of optical axis;

Near R: the radius-of-curvature the aspheric optical axis;

K: eccentricity;

Ai: asphericity coefficient (i=3～10).

And Fig. 3 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 1.And the ω in these aberration diagrams represents angle of half field-of view, and represents the aberration (also identical in Fig. 5,7,9,11,13,15,17,19,21,23 and 25) in sagittal image surface and the meridianal image surface in each aberration diagram of astigmatism.

As table 1 and 13 and shown in Figure 3, because of the wide-angle imaging lens of embodiment 1 is | Z5/Z6|=25.225, d8/L=0.188, f/D=0.151, f/f ₂=-0.705 and f/f ₃=0.538, thus the formula (1) that all satisfies condition, (2), (4), (5) and (6), and also field angle 2 ω are wide-angle with 155.0 °, can constitute the high performance wide-angle imaging lens of each aberration of revisal well.

(embodiment 2)

The formation of the wide-angle imaging lens of embodiment 2 as shown in Figure 4.

The formation of the small-sized heavy caliber wide-angle lens of embodiment 2 is identical with embodiment 1 basically.

Below, to the concrete data of embodiment 2 expressions.

And the material name of each lens of representing in the lattice on table 2 is with identical shown in the table 1.

[table 2]

Face	R	D	Ne	νd
						1	13.3436	1.00	1.77621	49.6	S-LAH66
2	3.4340	0.84
						3	3.9536	1.00	1.51081	56.0	ZEONEX
4	0.7133	1.02
						5	1.6447	1.60	1.58820	30.3	PC
6	-9.5785	0.94
						7	5.1269	1.50	1.51081	56.0	ZEONEX
8	-1.3343

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	4.90040×10 -1	-7.34729×10 -2	6.27911×10 -1	9.85716×10 -1	-1.76304×10 -1	-4.36653
A 3	3.64977×10 -4	1.04945×10 -2	2.49234×10 -2	3.86908×10 -2	-3.49716×10 -2	-1.84425×10 -1
							A 4	-2.35007×10 -2	-7.60706×10 -3	2.75903×10 -3	8.53414×10 -4	-1.09934×10 -1	6.58542×10 -2
A 5	6.61569×10 -3	-2.00756×10 -2	2.08673×10 -3	-1.82888×10 -2	1.18515×10 -1	-2.36348×10 -2
							A 6	6.51383×10 -4	-1.66082×10 -3	-2.04615×10 -2	7.79970×10 -3	-4.27242×10 -2	2.97507×10 -2
A 7	-7.03181×10 -4	3.05938×10 -3	3.08596×10 -3	8.39838×10 -3	4.43096×10 -4	-2.02055×10 -2
							A 8	8.91149×10 -5	-1.57279×10 -3	2.61332×10 -3	1.01772×10 -3	5.28871×10 -5	-7.66216×10 -4
A 9	0.00000	0.00000	0.00000	0.00000	-6.19528×10 -4	-1.02325×10 -4
							A 10	0.00000	0.00000	0.00000	0.00000	1.46318×10 -4	-1.19861×10 -4

And Fig. 5 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 2.

As table 2 and 13 and shown in Figure 5, because of the wide-angle imaging lens of embodiment 2 is | Z5/Z6|=570.453, d8/L=0.196, f/D=0.138, f/f ₂=-0.572 and f/f ₃=0.432, thus the formula (1) that all satisfies condition, (2), (4), (5) and (6), and also field angle 2 ω are wide-angle with 143.2 °, can constitute the high performance wide-angle imaging lens of each aberration of revisal well.

(embodiment 3)

The formation of the wide-angle imaging lens of embodiment 3 as shown in Figure 6.

The formation of the wide-angle imaging lens of embodiment 3 is identical with embodiment 2 basically.

Below, to the concrete data of embodiment 3 expressions.

And the material name of each lens of representing in the lattice on table 3 is with identical shown in the table 1.

[table 3]

Face	R	D	Ne	νd
						1	21.5859	1.00	1.51872	49.6	S-LAH66
2	5.0000	2.28
						3	3.5616	1.00	1.51081	56.0	ZEONEX
4	0.8001	1.41
						5	1.8637	1.66	1.58820	30.3	PC
6	-11.0518	0.94
						7	9.4284	2.04	1.51081	56.0	ZEONEX
8	-1.1814

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	4.73127×10 -1	-7.39188×10 -2	6.05540×10 -1	9.85625×10 -1	-1.72796×10 -1	-4.25623
A 3	-9.12033×10 -3	7.45945×10 -3	-5.76986×10 -3	2.49301×10 -2	-1.18470×10 -2	-2.11184×10 -1
							A 4	-2.48850×10 -2	-7.91869×10 -3	3.40054×10 -3	-1.34400×10 -3	-1.06296×10 -1	6.44380×10 -2
A 5	8.23694×10 -3	-1.39967×10 -2	1.32686×10 -2	-1.56334×10 -2	1.47073×10 -1	-2.19787×10 -2
							A 6	-8.89642×10 -4	-1.29388×10 -3	-1.48145×10 -2	6.84676×10 -3	-4.08180×10 -2	3.01625×10 -2
A 7	0.00000	5.54392×10 -4	0.00000	0.00000	1.19714×10 -2	-1.56759×10 -2
							A 8	0.00000	0.00000	6.74181×10 -8	0.00000	7.19987×10 -4	-3.96106×10 -4
A 9	0.00000	0.00000	0.00000	0.00000	3.02518×10 -3	3.11810×10 -3
							A 10	0.00000	0.00000	0.00000	0.00000	3.26160×10 -4	1.36048×10 -4

And Fig. 7 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 3.

As table 3 and 13 and shown in Figure 7, because of the wide-angle imaging lens of embodiment 3 is | Z5/Z6|=13.423, d8/L=0.140, f/D=0.108, f/f ₂=-0.487 and f/f ₃=0.394, thus the formula (1) that all satisfies condition, (2), (4), (5) and (6), and also field angle 2 ω are wide-angle with 139.4 °, can constitute the high performance wide-angle imaging lens of each aberration of revisal well.

(embodiment 4)

The formation of the wide-angle imaging lens of embodiment 4 as shown in Figure 8.

The formation of the wide-angle imaging lens of embodiment 4 is roughly the same with embodiment 3 basically, but the face shape of the object side of the 2nd lens L2 becomes concavity near optical axis Z, and this point is different with embodiment 3.

Below, to the concrete data of embodiment 4 expressions.

In the material name of each lens of representing in the lattice on table 4, the BSC7 of the 1st lens L1 is the ProductName of HOYA Corp. system glass material, the material name of other lenses L2～lens L4 identical with shown in the table 1.

[table 4]

Face	R	D	Ne	νd
						1	29.0159	1.00	1.51872	64.2	BSC7
2	5.0011	2.20
						3	-7.7023	1.00	1.51081	56.0	ZEONEX
4	1.1793	1.24
						5	1.5929	1.95	1.58820	30.3	PC
6	-23.273	0.93
						7	36.7549	1.50	1.51081	56.0	ZEONEX
8	-1.6591

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	-3.82180	-2.45075	-1.36227×10	1.09871	9.47972×10 -1	9.52628×10 -1
A 3	1.56526×10 -2	1.02281×10 -1	2.01119×10 -1	3.65364×10 -3	-3.17506×10 -2	-6.63334×10 -3
							A 4	-1.45922×10 -3	-1.15039×10 -2	-5.33174×10 -2	-2.16041×10 -3	-4.52884×10 -2	1.53411×10 -2
A 5	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 6	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 7	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 8	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 9	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 10	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000

And Fig. 9 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 4.

As table 4 and 13 and shown in Figure 9, because of the wide-angle imaging lens of embodiment 4 is | Z5/Z6|=28.857, d8/L=0.192, f/D=0.143, f/f ₂=-0.729 and f/f ₃=0.539, thus the formula (1) that all satisfies condition, (2), (4), (5) and (6), and also field angle 2 ω are wide-angle with 161.4 °, can constitute the high performance wide-angle imaging lens of each aberration of revisal well.

(embodiment 5)

The formation of the wide-angle imaging lens of embodiment 5 as shown in figure 10.

The formation of the wide-angle imaging lens of embodiment 5 is identical with embodiment 3 basically.

Below, to the concrete data of embodiment 5 expressions.

And the material name of each lens of representing in the lattice on table 5 is with identical shown in the table 4.

[table 5]

Face	R	D	Ne	νd
						1	25.0000	1.00	1.51872	64.2	BSC7
2	5.0000	1.80
						3	23.4372	1.00	1.51081	56.0	ZEONEX
4	0.9666	1.24
						5	2.0292	1.90	1.58820	30.3	PC
6	-8.3724	0.98
						7	4.9111	1.50	1.51081	56.0	ZEONEX
8	-2.0311

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	-9.71605×10 -1	-6.99636×10 -1	-5.29369	1.12479	1.00094	-4.73286×10 -1
A 3	-8.26189×10 -3	8.21730×10 -2	8.93572×10 -2	-6.56103×10 -4	-1.83117×10 -2	-4.58615×10 -3
							A 4	7.41952×10 -4	-2.61282×10 -2	-3.16040×10 -2	3.76933×10 -3	5.05218×10 -3	2.46108×10 -2
A 5	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 6	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 7	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 8	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 9	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 10	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000

And Figure 11 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 5.

As table 5 and 13 and shown in Figure 11, because of the wide-angle imaging lens of embodiment 5 is | Z5/Z6|=7.615, d8/L=0.199, f/D=0.147, f/f ₂=-0.691 and f/f ₃=0.465, so the formula (1) that all satisfies condition, (2), (4), (5) and (6), and field angle 2 ω are wide-angle with 152.0 °, constitute with the high performance wide-angle imaging lens of each aberration of revisal well.

(embodiment 6)

The formation of the wide-angle imaging lens of embodiment 6 as shown in figure 12.

The formation of the wide-angle imaging lens of embodiment 6 is identical with embodiment 4 basically.

Below, to the concrete data of embodiment 6 expressions.

And the material name of each lens of representing in the lattice on table 6 is with identical shown in the table 4.

[table 6]

Face	R	D	Ne	νd
						1	32.4000	1.00	1.51872	64.2	BSC7
2	5.0000	2.10
						3	-8.6146	1.00	1.51081	56.0	ZEONEX
4	1.2042	1.24
						5	1.6663	1.80	1.58820	30.3	PC
6	-19.7093	1.08
						7	16.1287	1.50	1.51081	56.0	ZEONEX
8	-1.7078

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	-1.17955	-1.40654	-4.45514	1.09790	9.45559×10 -1	4.86807×10 -1
A 3	1.14912×10 -2	6.67473×10 -2	9.53666×10 -2	2.24054×10 -2	1.67362×10 -3	-5.14022×10 -4
							A 4	-3.27843×10 -4	-5.50281×10 -3	-3.32842×10 -3	3.44830×10 -3	-4.85980×10 -2	4.51857×10 -3
A 5	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 6	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 7	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 8	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 9	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 10	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000

And Figure 13 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 6.

As table 6 and 13 and shown in Figure 13, because of the wide-angle imaging lens of embodiment 6 is | Z5/Z6|=44.939, d8/L=0.192, f/D=0.145, f/f ₂=-0.706 and f/f ₃=0.523, thus the formula (1) that all satisfies condition, (2), (4), (5) and (6), and also field angle 2 ω are wide-angle with 160.4 °, can constitute the high performance wide-angle imaging lens of good each aberration of revisal.

(embodiment 7)

The formation of the wide-angle imaging lens of embodiment 7 as shown in figure 14.

The formation of the wide-angle imaging lens of embodiment 7 is identical with embodiment 6 basically.

Below, to the concrete data of embodiment 7 expressions.

And the material name of each lens of representing in the lattice on table 7 is with identical shown in the table 4.

[table 7]

Face	R	D	Ne	νd
						1	25.0000	1.00	1.51872	64.2	BSC7
2	5.0000	1.98
						3	-14.9677	1.00	1.51081	56.0	ZEONEX
4	1.3984	1.24
						5	1.9475	1.80	1.58820	30.3	PC
6	-8.7928	1.10
						7	7.1389	1.50	1.51081	56.0	ZEONEX
8	-1.8967

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	7.20672×10 -1	-1.04262	-1.06457	1.01957	9.68194×10 -1	5.44179×10 -1
A 3	5.33578×10 -3	1.17105×10 -1	9.25082×10 -2	-1.11347×10 -2	-6.95857×10 -2	1.32730×10 -2
							A 4	6.47627×10 -5	-3.74968×10 -2	-4.37698×10 -2	6.34786×10 -3	-2.84903×10 -2	-1.49060×10 -2
A 5	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 6	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 7	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 8	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 9	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 10	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000

And Figure 15 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 7.

As table 7 and 13 and shown in Figure 15, because of the wide-angle imaging lens of embodiment 7 is | Z5/Z6|=5.985, d8/L=0.179, f/D=0.155, f/f ₂=-0.608 and f/f ₃=0.516, thus the formula (1) that all satisfies condition, (2), (4), (5) and (6), and also field angle 2 ω are wide-angle with 148.8 °, can constitute the high performance wide-angle imaging lens of each aberration of revisal well.

(embodiment 8)

The formation of the wide-angle imaging lens of embodiment 8 as shown in figure 16.

The formation of the wide-angle imaging lens of embodiment 8 is identical with embodiment 7 basically.

Below, to the concrete data of embodiment 8 expressions.

And in the material name of each lens of representing in the lattice on table 8, the S-BAL35 of the 1st lens L1 is the ProductName of the glass material of the HARA of Co., Ltd. O system, the material name of other lenses L2～lens L4 identical with shown in the table 1.

[table 8]

Face	R	D	Ne	νd
						1	31.9906	1.00	1.59143	61.2	S-BAL35
2	5.3200	2.20
						3	-16.4469	1.00	1.51081	56.0	ZEONEX
4	1.2241	1.24
						5	1.9580	2.05	1.58820	30.3	PC
6	-23.2730	100
						7	83.9222	1.60	1.51081	56.0	ZEONEX
8	-1.5419

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	-4.14022	-3.60650	-1.58257×10	1.09871	9.45942×10 -1	6.30443×10 -1
A 3	9.83753×10 -3	1.56132×10 -1	1.49167×10 -1	3.65364×10 -3	-4.65915×10 -3	1.68888×10 -2
							A 4	-1.17600×10 -3	-3.37794×10 -2	-3.63377×10 -2	-2.16041×10 -3	-3.74120×10 -2	5.56012×10 -3
A 5	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 6	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 7	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 8	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 9	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 10	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000

And Figure 17 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 8.

As table 8 and 13 and shown in Figure 17, because of the wide-angle imaging lens of embodiment 8 is | Z5/Z6|=26.268, d8/L=0.212, f/D=0.137, f/f ₂=-0.633 and f/f ₃=0.438, thus the formula (1) that all satisfies condition, (2), (4), (5) and (6), and also field angle 2 ω are wide-angle with 165.2 °, can constitute the high performance wide-angle imaging lens of each aberration of revisal well.

(embodiment 9)

The formation of the wide-angle imaging lens of embodiment 9 as shown in figure 18.

The formation of the wide-angle imaging lens of embodiment 9 is identical with embodiment 8 basically.

Below, to the concrete data of embodiment 9 expressions.

And the material name of each lens of representing in the lattice on table 9 is with identical shown in the table 4.

[table 9]

Face	R	D	Ne	νd
						1	26.1178	1.00	1.51872	64.2	BSC7
2	3.7491	1.98
						3	-10.6957	1.00	1.51081	56.0	ZEONEX
4	1.2269	1.24
						5	1.7679	1.95	1.58820	30.3	PC
6	-16.4908	0.93
						7	28.4040	1.50	1.51081	56.0	ZEONEX
8	-1.7980

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	-3.82495	-2.29831	-1.36601×10	1.09870	9.47972×10 -1	1.15840
A 3	2.18154×10 -2	1.05527×10 -1	1.72543×10 -1	-7.46690×10 -3	-2.27919×10 -2	3.97785×10 -3
							A 4	-2.73400×10 -3	-1.10934×10 -2	-4.98604×10 -2	-1.40997×10 -3	-4.56644×10 -2	1.61579×10 -2
A 5	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 6	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 7	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 8	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
A 9	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000
							A 10	0.00000	0.00000	0.00000	0.00000	0.00000	0.00000

And Figure 19 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 9.

As table 9 and 13 and shown in Figure 19, because of the wide-angle imaging lens of embodiment 9 is | Z5/Z6|=12.866, d8/L=0.216, f/D=0.137, f/f ₂=-0.633 and f/f ₃=0.438, thus the formula (1) that all satisfies condition, (2), (4), (5) and (6), and also field angle 2 ω are wide-angle with 156.0 °, can constitute the high performance wide-angle imaging lens of each aberration of revisal well.

(embodiment 10)

The formation of the wide-angle imaging lens of embodiment 10 as shown in figure 20.

The formation of the wide-angle imaging lens of embodiment 10 is identical with embodiment 1 basically.

Below, to the concrete data of embodiment 10 expressions.

And the material name of each lens of representing in the lattice on table 10 is with identical shown in the table 4.

[table 10]

Face	R	D	N c	ν d
						1	28.9725	1.0000	1.51872	64.2	BSC7
2	5.0000	1.0384
						3	3.4384	1.0000	1.51081	56.0	ZEONEX
4	0.7774	1.6441
						5	1.8572	1.4059	1.58820	30.3	PC
6	-18.8700	1.8655
						7	7.4133	1.7545	1.51081	56.0	ZEONEX
8	-1.1125

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	5.79478×10 -1	-7.75931×10 -2	6.28102×10 -1	9.85775×10 -1	-1.726947×10 -1	-4.23227
A 3	-9.85786×10 -3	4.20105×10 -3	4.71755×10 -3	1.51884×10 -3	-8.96936×10 -3	-2.19308×10 -1
							A 4	-2.47033×10 -2	-7.65152×10 -3	2.46477×10 -2	-1.31403×10 -3	-1.06709×10 -1	6.44627×10 -2
A 5	8.55304×10 -3	-1.46061×10 -2	7.85350×10 -2	-1.78421×10 -2	1.42914×10 -1	-2.13767×10 -2
							A 6	-1.01961×10 -3	1.30787×10 -4	-1.55683×10 -2	7.09028×10 -2	-4.11137×10 -2	3.03307×10 -2
A 7	0.00000	-1.82755×10 -4	0.00000	0.00000	1.00898×10 -4	-1.33316×10 -2
							A 8	0.00000	0.00000	6.74181×10 -8	0.00000	6.05961×10 -4	-2.26106×10 -4
A 9	0.00000	0.00000	0.00000	0.00000	2.35114×10 -3	4.49993×10 -3
							A 10	0.00000	0.00000	0.00000	0.00000	2.86878×10 -4	1.54180×10 -4

And Figure 21 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 10.

As table 10 and 13 and shown in Figure 21, because of the wide-angle imaging lens of embodiment 10 is | Z5/Z6|=10.64, d8/L=0.160, f/D=0.118, f/f ₂=-0.455 and f/f ₃=0.349, thus the formula (1) that all satisfies condition, (2), (4), (5) and (6), and also field angle 2 ω are wide-angle with 149.0 °, can constitute the high performance wide-angle imaging lens of each aberration of revisal well.

(embodiment 11)

[table 11]

Face	R	D	N c	ν d
						1	10.2609	1.00000	1.776208	49.6	S-LAH66
2	4.0021	1.81867
						3	3.8812	1.00000	1.51081	56.0	ZEONEX
4	0.6601	0.86906
						5	1.3031	1.80000	1.58820	30.3	PC
6	-12.8067	0.72000
						7	3.5823	1.50000	1.51081	56.0	ZEONEX
8	-2.1764

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	4.53928×10 -1	-1.03036×10 -2	2.66090×10 -1	9.85185×10 -1	-2.04783×10 -1	-4.57902
A 3	1.83702×10 -2	2.74998×10 -2	4.55513×10 -2	-2.55421×10 -2	-6.71793×10 -2	-1.06579×10 -1
							A 4	-2.65999×10 -2	-7.37360×10 -3	-1.98218×10 -3	3.96400×10 -3	-1.16465×10 -1	6.58810×10 -2
A 5	-9.49948×10 -3	-2.55401×10 -2	-3.06242×10 -2	2.86835×10 -2	8.80335×10 -2	-5.71827×10 -2
							A 6	7.98815×10 -3	-3.75898×10 -3	-2.17982×10 -2	1.11543×10 -2	-4.16444×10 -2	2.64303×10 -2
A 7	-1.14919×10 -1	-2.77060×10 -3	6.90848×10 -3	4.21179×10 -2	1.66112×10 -4	-3.28908×10 -2
							A 8	-3.39034×10 -3	-8.03415×10 -4	5.58436×10 -3	3.59943×10 -3	1.88907×10 -3	-4.48093×10 -4
A 9	0.00000	0.00000	0.00000	0.00000	1.24615×10 -2	7.61485×10 -3
							A 10	0.00000	0.00000	0.00000	0.00000	6.54490×10 -4	4.94947×10 -4

The formation of the wide-angle imaging lens of embodiment 11 as shown in figure 22.

The formation of the wide-angle imaging lens of embodiment 11 is identical with embodiment 1 basically.

Below, to the concrete data of embodiment 11 expressions.

And the material name of each lens of representing in the lattice on table 11 is with identical shown in the table 1.

And Figure 23 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 11.

As table 11 and 13 and shown in Figure 23, because of the wide-angle imaging lens of embodiment 11 is | Z5/Z6|=87.96, d8/L=0.195, f/D=0.168, f/f ₂=-0.843 and f/f ₃=0.695, thus the formula (1) that all satisfies condition, (2), (4), (5) and (6), and also field angle 2 ω are wide-angle with 145.2 °, can constitute the high performance wide-angle imaging lens of each aberration of revisal well.

(embodiment 12)

The formation of the wide-angle imaging lens of embodiment 12 as shown in figure 24.

The formation of the wide-angle imaging lens of embodiment 12 is identical with embodiment 1 basically.

Below, to the concrete data of embodiment 12 expressions.

And the material name of each lens of representing in the lattice on table 12 is with identical shown in the table 1.

Table 12

Face	R	D	N c	ν d
						1	13.3821	1.00000	1.776208	49.6	S-LAH66
2	4.0021	0.94734
						3	3.8869	1.00000	1.51081	56.0	ZEONEX
4	0.6593	0.87479
						5	1.3001	1.80000	1.58820	30.3	PC
6	-12.3622	0.72000
						7	3.3511	1.50002	1.51081	56.0	ZEONEX
8	-2.0959

10

Asphericity coefficient

Face number	3	4	5	6	7	8
							K	4.54973×10 -1	-1.69148×10 -2	2.69849×10 -1	9.85193×10 -1	-2.03522×10 -1	-4.58034
A 3	2.27939×10 -2	2.62903×10 -2	4.41621×10 -2	-2.07672×10 -2	-6.53543×10 -2	-1.05003×10 -1
							A 4	-2.61712×10 -2	-7.32423×10 -3	-1.89012×10 -3	3.90554×10 -3	-1.16258×10 -1	6.60946×10 -1
A 5	-8.02848×10 -3	-2.41596×10 -2	-3.10141×10 -2	267994×10 -2	8.80973×10 -2	-5.69838×10 -2
							A 6	7.72635×10 -3	-3.36589×10 -3	-2.18343×10 -2	1.09733×10 -2	-4.17623×10 -2	2.65120×10 -2
A 7	-1.51775×10 -3	-1.59327×10 -3	7.30678×10 -3	4.07455×10 -2	1.51737×10 -2	-3.33647×10 -1
							A 8	6.25501×10 -5	-6.26796×10 -4	5.74183×10 -3	3.50661×10 -3	1.77867×10 -3	-5.21187×10 -4
A 9	0.00000	0.00000	0.00000	0.00000	1.18812×10 -2	7.65458×10 -3
							A 10	0.00000	0.00000	0.00000	0.00000	6.47795×10 -4	6.71408×10 -4

And Figure 25 is the aberration diagram of all aberrations (spherical aberration, astigmatism, distortion aberration, multiplying power chromatic aberation, coma aberration) of the wide-angle imaging lens of expression embodiment 12.

As table 12 and 13 and shown in Figure 25, because of the wide-angle imaging lens of embodiment 12 is | Z5/Z6|=85.45, d8/L=0.207, f/D=0.185, f/f ₂=-0.835 and f/f ₃=0.690, thus the formula (1) that all satisfies condition, (2), (4), (5) and (6), and also field angle 2 ω are wide-angle with 145.2 °, can constitute the high performance wide-angle imaging lens of each aberration of revisal well.

[table 13] and, as wide-angle imaging lens of the present invention, be not limited to the foregoing description,

Table 13

	Condition Eq. (1)	Condition Eq. (2)	Condition Eq. (4)	Condition Eq. (5)	Condition Eq. (6)
								|Z5/Z6|	d8/L	f/D	f/f 2	f/f 3	r3/f
Embodiment
	1	25.22	0.202	0.151	-0.705	0.538	3.51
Embodiment 2								570.45	0.203	0.138	-0.572	0.432	3.64
	Embodiment 3	13.42	0.146	0.108	-0.487	0.394	3.18
Embodiment 4								28.86	0.203	0.143	-0.729	0.539	-5.48
	Embodiment 5	7.62	0.209	0.147	-0.691	0.465	16.93
Embodiment 6								44.94	0.204	0.145	-0.706	0.523	-6.11
	Embodiment 7	5.99	0.188	0.155	-0.608	0.516	-10.04
Embodiment 8								26.27	0.221	0.137	-0.633	0.438	-11.87
	Embodiment 9	12.87	0.229	0.149	-0.681	0.505	-7.50
Embodiment 10								10.64	0.160	0.118	-0.455	0.349	3.35
	Embodiment 11	87.96	0.195	0.168	-0.843	0.695	2.65
Embodiment 12								85.45	0.207	0.185	-0.835	0.690	2.68

Can also carry out numerous variations in addition.For example, one side in each two sides of the 2nd lens L2, the 3rd lens L3 and the 4th lens L4 can be constituted with sphere.

And, in the foregoing description 1～12, though the not shown shading member of representing in Fig. 12 except the effective diameter of the face of the picture side of the 1st lens L1, can also suitably be provided with shading member 2.

And, wide-angle imaging lens of the present invention, except vehicle-mounted vidicon, the camera for monitoring or the portable telephone that can also be installed on imaging apparatuss such as having CCD or CMOS are used on the first-class various optical devices of shooting.

Those skilled in the art under the prerequisite that does not break away from the spirit or scope of the present invention, can make various modifications and change with clear to described embodiment of the present invention.So the present invention should covering and the corresponding to all modifications of the present invention of scope and the change of claims and equivalent thereof.

The application requires respectively on February 21st, 2005 and the Japanese patent application No.JP2005-44472 of submission on February 10th, 2006 and the external right of priority of JP2006-33797, and their content is incorporated into this with for referencial use.

Claims (15)

1. wide-angle imaging lens is characterized in that:

Dispose following 4 lens successively and constitute from object side:

The 1st lens make its convex surface towards object side, and the meniscus shaped lens of the negative refraction that has;

The 2nd lens make the less relatively concave surface of its radius-of-curvature towards the picture side, and are aspheric surface at least simultaneously in the two sides, have negative refraction;

The 3rd lens make the less relatively convex surface of its radius-of-curvature towards object side, and are aspheric surface at least simultaneously in the two sides, have positive refraction; And

The 4th lens make the less relatively convex surface of its radius-of-curvature towards the picture side, and are aspheric surface at least simultaneously in the two sides, have positive refraction,

And, the Abbe number for the d line that constitutes the material of above-mentioned the 1st lens is set at more than 40, the Abbe number for the d line of the material of above-mentioned the 2nd lens of formation is set at more than 50, the Abbe number for the d line of the material of above-mentioned the 3rd lens of formation is set at below 40, the Abbe number for the d line of the material of above-mentioned the 4th lens of formation is set at more than 50

Between above-mentioned the 3rd lens and above-mentioned the 4th lens, dispose aperture diaphragm.

2. wide-angle imaging lens according to claim 1 is characterized in that,

The difference for the Abbe number of d line for the Abbe number of d line and the material that constitutes above-mentioned the 3rd lens that constitutes the material of above-mentioned the 2nd lens is set at more than 20.

3. wide-angle imaging lens according to claim 1 and 2 is characterized in that,

The two sides of each of above-mentioned the 2nd lens, above-mentioned the 3rd lens and above-mentioned the 4th lens is aspheric surface.

4. wide-angle imaging lens according to claim 3 is characterized in that,

Be formed with antireflection film on the face as side of above-mentioned the 1st lens, this antireflection film is more than the 150nm, below the 225nm near the optical thickness the optical axis.

5. wide-angle imaging lens according to claim 4 is characterized in that,

The formula that meets the following conditions (1):

|Z5/Z6|＞3...(1)

The Z5 summit of face of object side outermost light and poor at the optical axis direction coordinate of the intersection point of the face of above-mentioned object side outside the axle of optical axis direction coordinate and the outer most edge of effective diameter by this wide-angle imaging lens of representing above-mentioned the 3rd lens wherein; And

The summit of face of picture side that Z6 represents the 3rd lens at optical axis direction coordinate and this as poor at the optical axis direction coordinate of the intersection point of the face of side and above-mentioned outermost light.

6. wide-angle imaging lens according to claim 5 is characterized in that,

Distance from the face of the object side of above-mentioned the 1st lens to imaging surface is made as L, will from above-mentioned the 4th lens as the face of side when the distance of imaging surface is made as d8, the formula that meets the following conditions (2):

0.25＞d8/L＞0.13...(2)

Wherein, when having other optical components to get involved in light path, d8 and L are set at that the optical thickness at optical axis direction with these other optical components carries out that air converts and the distance of trying to achieve.

7. wide-angle imaging lens according to claim 1 is characterized in that,

At least one comprises the material of water-intake rate below 0.3% in described the 2nd, 3 and 4 lens.

8. wide-angle imaging lens comprises successively from object side:

The 1st lens make its convex surface towards object side, and the meniscus shaped lens of the negative refraction that has;

The 2nd lens make the less relatively concave surface of its radius-of-curvature towards the picture side, and are aspheric surface at least simultaneously in the two sides, have negative refraction;

The 3rd lens make the less relatively convex surface of its radius-of-curvature towards object side, and are aspheric surface at least simultaneously in the two sides, have positive refraction;

Aperture diaphragm; And

The 4th lens make the less relatively convex surface of its radius-of-curvature towards the picture side, and are aspheric surface at least simultaneously in the two sides, have positive refraction;

It is characterized in that,

The material that constitutes above-mentioned the 1st lens for the Abbe number of d line be set at more than 40, the material that constitutes above-mentioned the 2nd lens for the Abbe number of d line be set at 50 or more, the material that constitutes above-mentioned the 3rd lens for the Abbe number of d line be set at below 40, the material of above-mentioned the 4th lens of formation is set at more than 50 for the Abbe number of d line

The described wide-angle imaging lens formula (4) that satisfies condition:

0.10＜f/D＜0.22...(4)

Wherein f represents the focal length of described wide-angle imaging lens total system, and D representative from described the 1st lens at the face of object side to the distance of described the 4th lens at the face of picture side.

9. wide-angle imaging lens according to claim 8 is characterized in that,

The formula that satisfies condition (5) and (6):

-0.9＜f/f ₂＜-0.4...(5)

0.3＜f/f ₃＜0.8...(6)

F wherein ₂Represent the focal length of described the 2nd lens, and f ₃Represent the focal length of described the 3rd lens.

10. wide-angle imaging lens according to claim 8 is characterized in that,

The difference for the Abbe number of d line for the Abbe number of d line and the material that constitutes above-mentioned the 3rd lens that constitutes the material of above-mentioned the 2nd lens is set at more than 20.

11. wide-angle imaging lens according to claim 8 is characterized in that,

Two surfaces of described the 2nd lens all are aspheric surface, and two surfaces of described the 3rd lens all are aspheric surface, and two surfaces of described the 4th lens all are aspheric surface.

12. wide-angle imaging lens according to claim 8 is characterized in that,

Described the 1st lens have antireflection film at it as side, and near the optical thickness of this antireflection film optical axis is 150nm to 225nm.

13. wide-angle imaging lens according to claim 8 is characterized in that,

The formula that satisfies condition (1):

|Z5/Z6|＞3...(1)

The Z5 summit of face of object side outermost light and poor at the optical axis direction coordinate of the intersection point of the face of above-mentioned object side outside the axle of optical axis direction coordinate and the outer most edge of effective diameter by this wide-angle imaging lens of representing above-mentioned the 3rd lens wherein; And

The summit of face of picture side that Z6 represents the 3rd lens at optical axis direction coordinate and this as poor at the optical axis direction coordinate of the intersection point of the face of side and above-mentioned outermost light.

14. wide-angle imaging lens according to claim 8 is characterized in that,

The formula that satisfies condition (2):

0.25＞d8/L＞0.13...(2)

L representative distance wherein from the face of the object side of above-mentioned the 1st lens to imaging surface, d8 representative distance from the face of the picture side of above-mentioned the 4th lens to imaging surface, and when having other optical components to get involved in light path, d8 and L are set at that the optical thickness at optical axis direction with these other optical components carries out that air converts and the distance of trying to achieve.

15. wide-angle imaging lens according to claim 8 is characterized in that,

At least one comprises the material of water-intake rate below 0.3% in described the 2nd, 3 and 4 lens.

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