KR100440101B1 - Wide-angle zoom lens - Google Patents

Abstract

The present invention discloses a wide angle zoom lens.

A wide-angle zoom lens according to the present invention includes: a first lens group having negative refractive power in order from an object side; A second lens group having positive refractive power; And a third lens group having negative refractive power. The shift is made in a direction in which a gap between the first lens group and the second lens group and a gap between the second lens group and the third lens group is reduced when the shift from the wide-angle end to the telephoto end is performed. Among the lenses of the lens group, the lens closest to the object side has a meniscus shape in which the image surface side is concave. , (θ _W : maximum angle of light incident on the lens system at the wide-angle end (half angle), θ _t : maximum angle of light incident on the lens system at the telephoto end (half angle).

According to the present invention, it is possible to provide a compact wide-angle zoom lens having a high magnification ratio of 3 times or more and having an angle of view of 70 ° or more.

Description

Wide angle zoom lens {WIDE-ANGLE ZOOM LENS}

TECHNICAL FIELD The present invention relates to a zoom lens, and more particularly, to a wide-angle zoom lens used in a compact camera.

Recently, cameras have been miniaturized and lightened in accordance with rapid changes in the market and various demands of consumers. Accordingly, zoom lenses have also been miniaturized and lightened.

Miniaturization, that is, a compact camera is based on the characteristics of having a good degree of optical performance in a generally enlarged size, the appearance design, size, price, etc. are important design manufacturing parameters of the camera.

In particular, since a compact camera has a sales point depending on the size, a design capable of minimizing the size is the basis.

In the case of the wide-angle high-magnification zoom cameras belonging to the mid-to-high-end range, the size is quite large and the number of lenses is large, so the number of mechanical parts due to the zoom linkage increases, and the price is also considerably high. In particular, in the case of a zoom lens having a PPN structure including a first lens group having a positive refractive power and a second lens group applied to a wide-angle high magnification camera and a third lens group having a negative refractive power, the zoom stroke is large. As they become larger and the overall length becomes longer, it is quite difficult to minimize the size of the camera.

In addition, in the structure of the PPN, since both the first lens group and the second lens group have positive refractive power, optical performance sensitivity is biased to a specific lens group. In this case, in order to improve the performance quality of the optical system as a whole, the precision of the mechanical parts including the barrel constituting the lens must be considerably increased. As a result, the safety of the mass production performance quality is lowered and the price is increased.

On the other hand, about 20% of the ambient light ratio is required in the contact camera, but this is not easy to satisfy in the PPN structure in which positive refractive power is continued across the first lens group and the second lens group.

In addition, since the structure of the optical system has asymmetry around the aperture, the PPN structure is difficult to control the symmetry aberration, and it is difficult to correct the distortion aberration and the image surface curvature due to the strong positive refractive power of the first and second lens groups.

In order to secure the shortcomings of the PPN configuration, an NPN configuration has been proposed, which is composed of a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having negative refractive power. However, in the NPN configuration, the nonlinearity of the zoom trajectory is strong, and the distance between lens groups becomes narrower toward the telephoto end, so that a configuration capable of maintaining an appropriate lens feeding amount and a minimum lens group interval is required.

In addition, since the structure of the second lens group greatly affects the performance of the entire optical system, an appropriate lens configuration is required, and in particular, proper arrangement of lens materials is essential for correcting the magnification chromatic aberration for each zoom.

Therefore, the technical problem to be achieved by the present invention is to provide a wide-angle zoom lens having a minimum size while being made of a NPN structure in a compact camera, while implementing a wide angle and high magnification.

1 is a diagram illustrating a zoom position structure of a wide-angle zoom lens according to a first embodiment of the present invention.

2A and 2B are aberration diagrams of the wide-angle zoom lens according to the first embodiment of the present invention, respectively.

3 is a diagram illustrating a zoom position-specific structure of the wide-angle zoom lens according to the second embodiment of the present invention.

4A and 4B are aberration diagrams of the wide-angle zoom lens according to the second embodiment of the present invention, respectively.

5 is a diagram illustrating a zoom position structure of the wide-angle zoom lens according to the third embodiment of the present invention.

6A and 6B are aberration diagrams of the wide-angle zoom lens according to the third embodiment of the present invention, respectively.

7 is a diagram illustrating a zoom position structure of the wide-angle zoom lens according to the fourth embodiment of the present invention.

8A and 8B are aberration diagrams of the wide-angle zoom lens according to the fourth embodiment of the present invention, respectively.

9 is a diagram illustrating a zoom position structure of the wide-angle zoom lens according to the fifth embodiment of the present invention.

10A and 10B are aberration diagrams of the wide-angle zoom lens according to the fifth embodiment of the present invention, respectively.

In order to achieve the technical problem of the present invention, the wide-angle zoom lens according to the characteristics of the present invention, the first lens group having a negative refractive power in order from the object side; A second lens group having positive refractive power; And a third lens group having negative refractive power. The shift is made in a direction in which a gap between the first lens group and the second lens group and a gap between the second lens group and the third lens group is reduced when the shift from the wide-angle end to the telephoto end is performed. Among the lenses of the lens group, the lens closest to the object side has a meniscus shape in which an image surface side is concave, and the second lens group includes at least one bonded lens, , (θ _W : maximum angle of light incident on the lens system at the wide-angle end (half angle), θ _t : maximum angle of light incident on the lens system at the telephoto end (half angle).

Also, (L _w : distance from the lens surface closest to the object side at the wide-angle end, and L _t : distance from the lens surface closest to the object side at the telephoto end). (f ₂ : focal length of the second lens group, f _w : focal length of the lens system at the wide-angle end, f _t: focal length of the lens system at the telephoto end), and (f _w12 : summed focal length of the first lens group and the second lens group at the wide-angle end, f _t12 : summed focal length of the first lens group and the second lens group at the telephoto end).

In addition, the wide-angle zoom lens may be composed of six lenses.

In the wide-angle zoom lens according to the present invention having the above characteristics, the second lens group and the third lens group may include at least one aspherical lens.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1, 3, 5, 7, and 9 show the structure of the wide-angle zoom lens according to each embodiment of the present invention for each zoom position.

As shown in FIGS. 1, 3, 5, 7, and 9, the wide-angle zoom lens according to the embodiment of the present invention includes a first lens group having negative refractive power that is sequentially positioned from the object side ( I), a second lens group II having positive refractive power, and a third lens group III having negative refractive power, and comprising an aperture between the second lens group II and the third lens group III. A) is located.

The first lens group I includes a lens having negative refractive power and a lens having positive refractive power, and the two lenses are selectively bonded.

The second lens group II includes at least one or more bonded lenses, and in particular, the lens closest to the object side has a meniscus shape.

The third lens group III includes a lens having at least one negative refractive power, and additionally further includes a lens having positive refractive power.

In the wide-angle zoom lens according to the embodiment of the present invention having such an NPN structure, aspherical lenses may be included in the second lens group II and the third lens group III. FIGS. 1, 3, 5, and 7 And as shown in FIG. 9, the distance between the first lens group I and the second lens group II and the second lens group II and the third lens as each lens group moves from the wide-angle end to the telephoto end. The shift is made in the direction in which the interval of group III decreases.

The detailed structure of each lens group will be described in more detail in each embodiment described below.

Next, the operation of the wide-angle zoom lens according to the embodiment of the present invention having such a structure will be described.

The wide-angle zoom lens according to the embodiment of the present invention has the positive refractive power of the second lens group as described above, so that the angle of view at the wide-angle end has good optical performance with a wide angle of 70 ° or more and at least three times higher magnification. The negative refractive power of the first lens group and the third lens group is based on the NPN structure having symmetry. According to this NPN structure, the sensitivity of the lens can be stabilized and the ambient light ratio can be adjusted to the required level.

Particularly, in the embodiment of the present invention, the diaphragm is disposed between the second lens group and the third lens group so that the lens diameters of the first lens group and the third lens group do not become larger than an appropriate level, and the ambient light amount is stably secured. This prevents a decrease in the peripheral light quantity ratio, which may be a problem at wide angles.

In addition, the lens positioned closest to the object side in the second lens group is configured in a meniscus shape so that the aberration performance can be satisfactorily corrected at the time of shifting and the displacement of the image.

Here, the second lens group is composed of a plurality of lenses, lenses other than the first lens of the meniscus shape to determine the overall zoom ratio and angle of view, the first meniscus lens is spherical or coma aberration Perform the calibration, etc. In particular, it is possible to balance magnification chromatic aberration and aberration balance for each zoom, and to minimize the thickness of the meniscus lens to have a strong negative refractive power, thereby limiting the size of the lens mirror of the first lens group to facilitate wide angle and aberration balance. Can be implemented.

In addition, the aspherical lens is properly positioned in the lens group so that the optical performance is improved while the number of lenses can be minimized as much as possible. In particular, the aspherical lens is implemented in a material and shape that is easy to form and ensures stability during manufacturing.

In addition, in the wide-angle zoom lens according to the embodiment of the present invention, the NPN structure has a NPN structure, and shifts in a direction in which the distance between the lens groups decreases when zooming from the wide-angle end to the telephoto end. The optical field is minimized by securing a wide angle of view with negative refractive power, while reducing the distance between lens groups when proceeding from the wide end to the telephoto end.

The wide-angle zoom lens according to the present invention satisfies the following conditions so that miniaturization is possible while satisfying the wide-angle and high magnification.

(Condition 1)

(Condition 2)

Here, θ _W represents the maximum angle (half angle) of light rays incident on the lens system at the wide end, and θ _t represents the maximum angle (half angle) of light rays incident on the lens system at the telephoto end.

Conditional Expressions 1 and 2 above are intended to obtain a zoom ratio of 3 times or more while satisfying a wide angle of 70 degrees or more at the wide angle end.

The wide-angle zoom lens according to the embodiment of the present invention satisfies the above Conditional Expressions 1 and 2 in order to secure an angle of view of at least 70 ° at the wide-angle end while minimizing the lens length, and defines the zoom stroke according to such conditions as follows. It was.

(Condition 3)

Here, L _w represents the distance from the lens surface closest to the object side at the wide-angle end, and L _t represents the distance from the lens surface closest to the object side at the telephoto end.

Conditional Expression 3 is intended to facilitate the miniaturization by properly defining the size of the overall length while securing a wide angle of view when changing.

On the other hand, in the wide-angle zoom lens of the present invention, since the power of the second lens group with respect to the entire lens group greatly affects the optical performance, when the power of the second lens group becomes too weak, it becomes difficult to widen the angle at about 3 times. Correction of magnification chromatic aberration and upper surface curvature by zoom position becomes difficult. On the other hand, when the power of the second lens group is too strong, it is difficult to secure the ambient light quantity ratio, and also it is difficult to adjust the aberration for each field.

In order to secure performance stability of the entire lens system in consideration of the characteristics of the second lens group, the wide-angle zoom lens according to the present invention further satisfies the following conditions.

(Condition 4)

Here, f ₂ represents the focal length of the second lens group, f _w represents the focal length of the lens system at the wide-angle end, and f _t represents the focal length of the lens system from the telephoto end.

Conditional Expression 4 is to implement a high magnification, when the lower than the lower limit of Conditional Expression 4 it is difficult to implement a high magnification, and if it rises above the upper limit of Conditional Expression 4 becomes a wide angle configuration.

In addition, in the present invention, as described above in the NPN structure, the lens closest to the object side among the lenses of the second lens group is configured in a meniscus shape, and the second lens group includes at least one or more junction lenses. Therefore, the effect of chromatic aberration due to the minimum number of lenses is minimized. The junction lens performs an important function in correcting chromatic aberration by appropriately allocating the power of each lens group to obtain a zoom configuration and a wide angle. In the case of not using the junction lens, the performance sensitivity of the lens system increases with respect to the air gap, which affects the overall optical performance. Therefore, it is necessary to use the junction lens to improve manufacturing performance through dispersion of sensitivity.

In general, in a lens system composed of three lens groups, when the minimum number of lenses for each lens group is two sheets, it is very important to properly distribute power for each lens group, and the aspherical position also affects optical performance. .

Basically, chromatic aberration is corrected to some extent by the lens having negative refractive power and positive refractive power of each lens group to maintain chromatic aberration balance for each zoom position, and aspheric lens is used to finally correct the aberration characteristics for each field. .

In an embodiment of the present invention, at least one or more aspherical surfaces are used for each of the second lens group and the third lens group to perform spherical aberration, residual coma aberration, and image balance correction for each zoom position.

To this end, the wide-angle zoom lens according to the embodiment of the present invention satisfies the following conditions.

(Condition 5)

Here, f _w12 represents the summed focal length of the first lens group and the second lens group at the wide-angle end, and f _t12 represents the summed focal length of the first lens group and the second lens group at the telephoto end.

Condition Equation 5 defines the range for the zoom factor and the refractive powers of the first and second lens groups, that is, the N and P shapes, so that the stroke may be generated despite the high magnification.

If it is lower than the lower limit of Conditional Expression 5, four times more than zoom can not be implemented, and if it is raised above the upper limit of Conditional Expression 5, the zoom magnification is not realized.

Example values of the wide-angle zoom lens according to the embodiment of the present invention satisfying these conditions (Conditions 1 to 5) are as follows.

F is the focal length, ri (i = 1-12, 13, 16, 19) is the radius of curvature of the lens surface, di (i = 1-12, 13, 16, 19) is the lens thickness or lens Represents the distance between, nd represents the refractive index and v represents the dispersion value. The unit of the value representing length is mm.

The F number Fno of the zoom lens according to the first embodiment of the present invention has a value of 4.65 to 11.55 between the wide-angle end and the telephoto end, and the focal length f has a value of 29.0 mm to 87.9 mm, 2ω) has a value of 74.48 ° to 27.52 °, and the postfocal distance fB has a value of 8.51mm to 51.8mm.

As shown in FIG. 1, the wide-angle zoom lens according to the first embodiment of the present invention having the above characteristics has the first lens group I having negative refractive power, the first lens 1 having both surfaces concave, and the positive refractive power. A second lens (2) having a convex side of the object, and the second lens group (II) having a negative refractive power and a concave meniscus lens having an image side concave, a third lens (3) having a positive refractive power, and having both surfaces convex. And a fourth lens 4, a fifth lens 5 bonded to the fourth lens 4 and having a negative refractive power and a concave side surface of the object, and a sixth lens 6 having a positive refractive power and both convex surfaces. In addition, the third lens group III has a seventh lens 7 having positive refractive power and an image side convex, an eighth lens 8 having a negative refractive power and a convex meniscus lens having an image side convex, and negative refractive power. It comprises a ninth lens (9) in which the object side surface is concave.

Table 1 shows exemplary values of each lens constituting the zoom lens according to the first embodiment of the present invention.

Face number Radius of curvature (r) Thickness, distance (d) Refractive index (nd) Variance (v) One -23.06858 1.200010 1.785897 43.9344 2 83.40397 0.100000 3 28.50210 2.323847 1.846663 23.7848 4 172.21363 6.612533-2.110000 5 12.64729 0.800014 1.620409 60.3438 6 8.72168 0.339217 7 10.89244 3.599998 1.487489 70.4412 8 -10.89244 3.196577 1.846663 23.7848 9 -44.30448 0.567826 10 32.61281 1.956183 1.620040 36.3006 11 -19.60594 1.200000 12 ∞ 7.920492-2.040000 13 ∞ 0.276521 14 -69.03789 2.999999 1.647690 33.8406 15 -11.78952 0.674659 16 -12.62195 1.799994 1.756999 47.7125 17 -39.30325 2.745960 18 -9.20143 1.200275 1.756999 47.7125 19 -70.03136 fB

Fig. 2A shows the aberration characteristics at the wide-angle end of the zoom lens according to the first embodiment of the present invention, which consists of these embodiment values, and Fig. 2B shows the aberration characteristics at the telephoto end.

In addition, the F number Fno of the zoom lens according to the second embodiment of the present invention has a value of 4.62 to 14.73 between the wide-angle end and the telephoto end, and the focal length f has a value of 29.0 mm to 102.0 mm. The angle of view 2ω has a value of 74.5 ° to 19.13 °, and the post focal length fB has a value of 8.01 mm to 58.87 mm.

As shown in FIG. 3, the wide-angle zoom lens according to the second embodiment of the present invention having such characteristics has the same structure as that of the first embodiment, but only the eighth lens of the third lens group III. 8) has a concave shape on both sides.

Table 2 shows exemplary values of each lens constituting the zoom lens according to the second embodiment of the present invention.

Face number Radius of curvature (r) Thickness, distance (d) Refractive index (nd) Variance (v) One -23.78162 1.200000 1.761214 42.3314 2 19.83430 0.225643 3 18.89907 2.937057 1.847000 23.8000 4 -316.53225 7.776873-1.500000 5 13.11153 0.800000 1.823128 32.3686 6 7.01664 0.100000 7 7.12745 4.100391 1.490666 68.0574 8 -8.10422 0.800000 1.825458 31.2419 9 -36.11710 0.802251 10 111.76505 3.200000 1.624485 34.9519 11 -12.35735 1.200000 12 ∞ 9.222062-2.330000 13 ∞ 0.885217 14 68.66526 3.200000 1.677676 30.6597 15 -25.16664 0.640161 16 -58.50356 1.500000 1.774464 47.9090 17 34.92593 4.628983 18 -9.43663 1.200000 1.720358 51.0730 19 -60.79594 fB

Fig. 4A shows the aberration characteristics at the wide-angle end of the zoom lens according to the second embodiment of the present invention made up of these embodiment values, and Fig. 4B shows the aberration characteristics at the telephoto end.

In addition, the F number Fno of the zoom lens according to the third embodiment of the present invention has a value of 4.18 to 11.23 between the wide-angle end and the telephoto end, and the focal length f has a value of 29.02 mm to 87.07 mm, The angle of view 2ω has a value of 74 ° to 27.5 °, and the post focal length fB has a value of 9.23 mm to 53.46 mm.

As shown in FIG. 5, the wide-angle zoom lens according to the third embodiment of the present invention having the above characteristics has the same first lens group I as the first embodiment, but the second lens group II is A third lens 3 having negative refractive power and a concave meniscus lens, a fourth lens 4 having positive refractive power and bonded to the third lens 3, and having both sides convex, a positive refractive power, and an object side surface A sixth lens (6) comprising a convex fifth lens (5), the third lens group (III) having positive refractive power and an image side convex, a sixth lens (6), a negative refractive power and a sixth lens (6) And a seventh lens 7 which is a meniscus lens in which an image side surface is convex, and an eighth lens 8 having negative refractive power and a concave object side surface.

Table 3 shows the example values of each lens constituting the zoom lens according to the third embodiment of the present invention.

Face number Radius of curvature (r) Thickness, distance (d) Refractive index (nd) Variance (v) One -27.06081 1.200000 1.824022 31.9262 2 15.02984 0.741294 3 16.41772 3.472732 1.847000 23.8000 4 -21183.08889 9.158545-2.910000 5 13.41267 3.400000 1.847000 23.8000 6 8.13226 3.223305 1.487000 70.4000 7 -46.99539 0.100000 8 17.40117 3.243601 1.505994 60.0210 9 168.37540 1.200000 10 ∞ 7.715178-1.570000 11 ∞ 0.641795 1.687283 30.0540 12 -34.26471 3.200000 1.804000 46.5000 13 -10.32719 1.437954 14 -16.09482 4.770923 1.804000 46.5000 15 -10.51314 2.000000 16 -101.83138 fB

Fig. 6A shows the aberration characteristics at the wide-angle end of the zoom lens according to the third embodiment of the present invention, which consists of these embodiment values, and Fig. 6B shows the aberration characteristics at the telephoto end.

In addition, the F number Fno of the zoom lens according to the fourth embodiment of the present invention has a value between 4.21 and 11.36 between the wide-angle end and the telephoto end, and the focal length f has a value between 29.0 mm and 87.9 mm, The angle of view 2ω has a value of 74.89 ° to 27.67 °, and the postfocal distance fB has a value of 9.5mm to 60.87mm.

As shown in FIG. 7, the wide-angle zoom lens according to the fourth embodiment of the present invention having the above characteristics has the same shape as that of the third embodiment, but the second lens group II is different from that of the first lens group I. The first lens 1 and the second lens 2 are joined. Further, the third lens group III includes only the sixth lens 6 which is a menisker lens having positive refractive power and the image side convex, and the seventh lens 7 having negative refractive power and the object side surface concave.

In the fourth embodiment, the object side surface of the fifth lens 5 of the second lens group II is aspherical, and the object side surface of the sixth lens 6 of the third lens group III is aspheric.

Table 4 shows an example value of each lens constituting the zoom lens according to the fourth embodiment of the present invention.

Face number Radius of curvature (r) Thickness, distance (d) Refractive index (nd) Variance (v) One -23.36581 1.200000 1.816444 33.2931 2 17.37212 3.483184 1.847000 23.8000 3 -248.63296 8.575525-3.020000 4 10.45933 1.000000 1.847000 23.8000 5 7.73100 3.400000 1.515461 67.4904 6 -72.18695 1.272114 * 7 41.85264 1.928413 1.583129 59.4596 8 199.96281 1.200000 9 ∞ 11.016643-1.720000 * 10 -36.33621 3.200000 1.846663 23.7848 11 -17.03587 3.081060 12 -11.11394 1.200000 1.807501 42.9981 13 -172.13014 fB

* Denotes aspherical surface, and the formula for aspherical surface coefficient is as follows.

x: distance from lens vertex to optical axis direction

y: distance in the direction perpendicular to the optical axis

c: Inverse of the radius of curvature at the vertex of the lens (1 / R)

K: Conic constant

A, B, C, D: Aspheric coefficient

The coefficients of each aspherical surface are shown in Table 5.

Aspheric coefficient of page 7 Aspheric coefficient of page 10 K 1618.079995 K 12.265413 A 0.965391E-04 A 0.487551E-04 B -0.131856E-05 B -0.346866E-06 C 0.440652E-07 C 0.820976E-08 D -0.186941E-08 D 0.101955E-10

Fig. 8A shows the aberration characteristics at the wide-angle end of the zoom lens according to the fourth embodiment of the present invention, which consists of these embodiment values, and Fig. 8B shows the aberration characteristics at the telephoto end.

In addition, the F number Fno of the zoom lens according to the fifth embodiment of the present invention has a value of 4.29 to 11.29 between the wide-angle end and the telephoto end, and the focal length f has a value of 29.05 mm to 87.14 mm. The angle of view 2ω has a value of 73.8 ° to 27.68 °, and the post focal length fB has a value of 10.72mm to 60.47mm.

As shown in FIG. 9, the wide-angle zoom lens according to the fifth embodiment of the present invention having such characteristics is made in the same manner as the fourth embodiment, and only the first lens 1 of the first lens group I and The second lens 2 is not bonded, and the second lens group II is bonded to the third lens 3 and the third lens 3, which are meniscus lenses having negative refractive power and having an image side concave. And a fourth lens 4 having positive refractive power and convex on the object side.

In the fifth embodiment, the image side surface of the fourth lens 4 of the second lens group II is aspherical, and the object side surface of the fifth lens 5 of the third lens group III is aspheric.

Table 6 shows an example value of each lens constituting the zoom lens according to the fifth embodiment of the present invention.

Face number Radius of curvature (r) Thickness, distance (d) Refractive index (nd) Variance (v) One -25.45651 1.232451 1.838198 37.0257 2 20.83588 0.165024 3 18.21997 3.279807 1.789811 25.4501 4 1375.80489 9.555679-2.940000 5 10.56694 1.295360 1.846981 23.8027 6 7.15006 3.398309 1.583129 59.4596 * 7 -45.50756 2.377269 8 ∞ 10.790997-2.880000 * 9 -22.38826 2.481941 1.845060 23.6600 10 -13.80339 3.336142 11 -10.01021 1.200000 1.804079 46.4138 12 -55.15724 fB

* Indicates an aspherical surface, and the coefficients of each aspherical surface are shown in Table 7 below.

Aspheric coefficient of page 7 Aspheric coefficient of page 10 K -62.588301 K 5.320110 A 0.282265E-04 A 0.495527E-04 B 0.448980E-06 B -0.443712E-06 C -0.323710E-08 C 0.153990E-07 D -0.646172E-10 D 0.353876E-10

Fig. 10A shows the aberration characteristics at the wide-angle end of the zoom lens according to the fifth embodiment of the present invention made up of these embodiment values, and Fig. 10B shows the aberration characteristics at the telephoto end.

The invention is not limited to the embodiments described above, and various modifications and changes are possible within the scope of the following claims.

As described above, according to the embodiment of the present invention, it is possible to provide a compact wide-angle zoom lens having a high magnification ratio of 3 times or more and having an angle of view of 70 ° or more.

Claims (5)

In order from the object side, A first lens group having negative refractive power; A second lens group having positive refractive power and comprising at least one bonding lens; And A third lens group having negative refractive power, The shift is made in a direction in which a gap between the first lens group and the second lens group and a gap between the second lens group and the third lens group is reduced when the shift from the wide-angle end to the telephoto end is performed. A wide-angle zoom lens, wherein a lens closest to an object side among lenses of a lens group is made of a meniscus lens having an image surface concave, and satisfying the following condition. θ _W : maximum angle of light incident on the lens system at the wide end (half angle) θ _t : maximum angle of light incident on the lens system from the telephoto end (half angle) L _w : Distance from the lens surface closest to the object side at the wide-angle end to the image surface L _t : Distance from the lens surface closest to the object side in the telephoto end delete The wide-angle zoom lens of claim 1, further satisfying the following conditions. f ₂ : Focal length of the second lens group f _w : Focal length of the lens system at the wide end f _t: Focal length of the lens system from the telephoto end f _w12 : Combined focal length of the first lens group and the second lens group at the wide-angle end f _t12 : Combined focal length of the first lens group and the second lens group in the telephoto end The method of claim 1, The wide-angle zoom lens is composed of six lenses. The method of claim 1, And the second lens group and the third lens group include at least one or more aspherical lenses.