TWI634364B - Six-piece optical lens system with a wide field of view - Google Patents

Abstract

The present invention is a six-piece wide-angle lens group comprising, from the object side to the image side, a first lens having a negative refractive power, a second lens having a positive refractive power, an aperture, and a third lens having a third lens. Positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power. Accordingly, the present invention provides a six-piece wide-angle lens group that enhances the angle of drawing, has high resolution, short lens length, and small distortion.

Description

Six-piece wide-angle lens group

The present invention relates to a six-piece wide-angle lens group, and more particularly to a miniaturized six-piece wide-angle lens group for use in electronic products.

With the rise of electronic products with photographic functions, the demand for optical systems is increasing. In the shooting, in order to obtain a wider shooting range, the angle of view of the lens is required to meet certain requirements, and thus the requirements for the angle and quality of the lens are becoming stricter. Usually, the angle of the lens (the field of view FOV) is designed to be 50 to 60 degrees. If the angle of the above design is exceeded, not only the aberration is large, but also the design of the lens is complicated. Conventional US 8335043, US 8576497 use 2 lens groups, 5-6 pieces to achieve a large angle purpose, but its distortion is too large, and such as US 8593737, US 8576497, US 8395853, although it can achieve a large angle purpose, However, the total length (TL) of the lens group is too long.

Therefore, how to develop a small-sized six-piece wide-angle lens group, which can be equipped with a lens for a digital camera, a lens for a network camera, or a mobile phone lens, etc., and has a larger angle of painting. The effect of reducing the efficiency of the aberration to reduce the complexity of the lens design is the motivation for the development of the present invention.

The object of the present invention is to provide a six-piece wide-angle lens group, especially a six-piece wide-angle lens group with improved drawing angle, high resolution, short lens length and small distortion.

In order to achieve the foregoing object, a six-piece wide-angle lens group according to the present invention comprises, in order from the object side to the image side, a first lens having a negative refractive power and a near-optical axis of the object side surface. The convex surface has a concave surface at the near-optical axis of the image side surface, and at least one surface of the object side surface and the image side surface is aspherical; a second lens has a positive refractive power, and the object side surface has a concave surface at a near optical axis. The image side surface has a convex surface at a near optical axis, and at least one surface of the object side surface and the image side surface is aspherical; an aperture; a third lens having a positive refractive power, and the object side surface is convex at a near optical axis. The image side surface of the image has a convex surface, and at least one surface of the object side surface and the image side surface is aspherical; a fourth lens has a negative refractive power, and the object side surface is convex at the near optical axis, and the image side thereof The surface near the optical axis is a concave surface, and at least one surface of the object side surface and the image side surface is aspherical; a fifth lens has a positive refractive power, and the object side surface is convex at the near optical axis, and the image side surface is low beam The shaft is convex, and its object side surface and image side surface are a surface is aspherical; a sixth lens has a negative refractive power, and the object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis, and at least one surface of the object side surface and the image side surface is The aspherical surface has at least one surface of the object side surface and the image side surface having at least one inflection point.

Preferably, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, and the following condition is satisfied: -0.1 < f1/f2 < -0.005. Thereby, the refractive power arrangement of the first lens and the second lens is suitable, which is advantageous for obtaining a wide angle of view (angle of view) and reducing excessive increase of system aberration.

Preferably, wherein the focal length of the second lens is f2, the focal length of the third lens is f3, and the following condition is satisfied: 25 < f2 / f3 < 180. Thereby, the refractive power of the third lens can be effectively distributed while ensuring that the refractive power of the third lens is not excessively large, which is advantageous in reducing system sensitivity and reducing generation of aberrations.

Preferably, wherein the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the following condition is satisfied: -0.6 < f3/f4 < -0.25. Thereby, the configuration of the refractive power can be effectively balanced to enhance the correction of the aberration of the six-piece wide-angle lens group.

Preferably, wherein the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, and the following condition is satisfied: -1.9 < f4/f5 < -1.3. Thereby, the chromatic aberration of the lens group of the image system can be balanced to improve the image quality.

Preferably, wherein the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the following condition is satisfied: -1.3 < f5/f6 < -0.8. Thereby, the refractive power arrangement of the rear group lens system can be balanced, which is beneficial to the reduction of system sensitivity and the correction of high-order aberrations.

Preferably, wherein the focal length of the first lens is f1, the focal length of the third lens is f3, and the following condition is satisfied: -2.3 < f1/f3 < -1.7. Thereby, the refractive power of the first lens is effectively distributed, and the sensitivity of the six-piece wide-angle lens group is reduced.

Preferably, wherein the focal length of the second lens is f2, the focal length of the fourth lens is f4, and the following condition is satisfied: -70 < f2/f4 < -15. Thereby, it is advantageous to enhance the large viewing angle and large aperture characteristics of the six-piece imaging lens group, and the sensitivity thereof can be reduced, which is advantageous for the manufacture of each lens and the improvement of the production yield.

Preferably, wherein the focal length of the third lens is f3, the focal length of the fifth lens is f5, and the following condition is satisfied: 0.5 < f3 / f5 < 0.9. Thereby, it is advantageous to enhance the large viewing angle and large aperture characteristics of the six-piece imaging lens group, and the sensitivity thereof can be reduced, which is advantageous for the manufacture of each lens and the improvement of the production yield.

Preferably, wherein the focal length of the fourth lens is f4, the focal length of the sixth lens is f6, and the following condition is satisfied: 1.5 < f4/f6 < 2.0. Thereby, the sensitivity of the lens group of the camera system can be reduced, and the total length thereof can be effectively shortened.

Preferably, wherein the focal length of the first lens is f1, the combined focal length of the second lens and the third lens is f23, and the following condition is satisfied: -2.4 < f1/f23 < -1.65. By proper configuration of the refractive power, it helps to reduce the occurrence of spherical aberration and astigmatism.

Preferably, wherein the combined focal length of the second lens and the third lens is f23, the combined focal length of the fourth lens and the fifth lens is f45, and the following condition is satisfied: 0.15 <f23/f45 < 0.6. When f23/f45 satisfies the foregoing relationship, the six-piece wide-angle lens group can have a large picture angle, a high number of pictures, and a low lens height, and the resolution capability is remarkably improved. Otherwise, if the optical data value is exceeded. The range will result in problems with the performance, low resolution, and insufficient yield of the six-piece wide-angle lens group.

Preferably, wherein the fourth lens and the fifth lens have a combined focal length of f45, the sixth lens has a focal length of f6, and satisfies the following condition: -2.6 <f45/f6 < -1.4. When f45/f6 satisfies the foregoing relationship, the six-piece wide-angle lens group can have a large picture angle, a high number of pictures, and a low lens height, and the resolution capability is remarkably improved. Otherwise, if the optical data value is exceeded. The range will result in problems with the performance, low resolution, and insufficient yield of the six-piece wide-angle lens group.

Preferably, wherein the combined focal length of the first lens and the second lens is f12, the combined focal length of the third lens and the fourth lens is f34, and the following condition is satisfied: -1.7 < f12/f34 < -1.1. When f12/f34 satisfies the foregoing relationship, the six-piece wide-angle lens group can have a large picture angle, a high number of pictures, and a low lens height, and the resolution capability is remarkably improved. Otherwise, if the optical data value is exceeded. The range will result in problems with the performance, low resolution, and insufficient yield of the six-piece wide-angle lens group.

Preferably, wherein the combined focal length of the third lens and the fourth lens is f34, the combined focal length of the fifth lens and the sixth lens is f56, and the following condition is satisfied: -1.6 < f34/f56 < -0.65. When f34/f56 satisfies the foregoing relationship, the six-piece wide-angle lens group can have a large picture angle, a high number of pictures, and a low lens height, and the resolution capability is remarkably improved. Otherwise, if the optical data value is exceeded. The range will result in problems with the performance, low resolution, and insufficient yield of the six-piece wide-angle lens group.

Preferably, wherein the focal length of the first lens is f1, the combined focal length of the second lens, the third lens and the fourth lens is f234, and the following condition is satisfied: -1.8 < f1/f234 < -1.0. By proper configuration of the refractive power, it helps to reduce the occurrence of spherical aberration and astigmatism.

Preferably, wherein the second lens, the third lens and the fourth lens have a combined focal length of f234, and the combined focal length of the fifth lens and the sixth lens is f56, and the following condition is satisfied: -1.6 < f234/f56 < - 0.6. By proper configuration of the refractive power, it helps to reduce the occurrence of spherical aberration and astigmatism.

Preferably, wherein the first lens, the second lens and the third lens have a combined focal length of f123, the fourth lens has a focal length of f4, and satisfies the following condition: -0.65 < f123/f4 < -0.35. By proper configuration of the refractive power, it helps to reduce the occurrence of spherical aberration and astigmatism.

Preferably, wherein the first lens, the second lens and the third lens have a combined focal length of f123, the fourth lens and the fifth lens have a combined focal length of f45, and satisfy the following condition: 0.2 < f123/f45 < 0.75. When f123/f45 satisfies the foregoing relationship, the six-piece wide-angle lens group can have a large picture angle, a high number of pictures, and a low lens height, and the resolution capability is remarkably improved. Otherwise, if the optical data value is exceeded. The range will result in problems with the performance, low resolution, and insufficient yield of the six-piece wide-angle lens group.

Preferably, wherein the first lens, the second lens and the third lens have a combined focal length of f123, the fourth lens, the fifth lens and the sixth lens have a combined focal length of f456, and satisfy the following conditions: 1.0 < f123/ F456 < 1.55. When f123/f456 satisfies the foregoing relationship, the six-piece wide-angle lens group can have a large picture angle, a high number of pictures, and a low lens height, and the resolution capability is remarkably improved. Otherwise, if the optical data value is exceeded. The range will result in problems with the performance, low resolution, and insufficient yield of the six-piece wide-angle lens group.

Preferably, the composite focal length of the first lens and the second lens is f12, and the combined focal length of the third lens, the fourth lens, the fifth lens and the sixth lens is f3456, and the following condition is satisfied: -2.7 < f12 /f3456 < -1.95. When f12/f3456 satisfies the foregoing relationship, the six-piece wide-angle lens group can have a large picture angle, a high number of pictures, and a low lens height, and the resolution capability is remarkably improved. Otherwise, if the optical data value is exceeded. The range will result in problems with the performance, low resolution, and insufficient yield of the six-piece wide-angle lens group.

Preferably, wherein the third lens has a dispersion coefficient of V3, the fourth lens has a dispersion coefficient of V4, and satisfies the following condition: 30 < V3-V4 < 42. Thereby, the chromatic aberration of the six-piece wide-angle lens group can be corrected.

Preferably, wherein the fifth lens has a dispersion coefficient of V5, the sixth lens has a dispersion coefficient of V6, and satisfies the following condition: 30 < V5-V6<42. Thereby, the chromatic aberration of the six-piece wide-angle lens group can be corrected.

Preferably, wherein the overall focal length of the six-piece wide-angle lens group is f, the distance from the object side surface of the first lens to the imaging plane on the optical axis is TL, and the following condition is satisfied: 0.25 < f/TL < 0.6 . Thereby, it is advantageous to obtain a wide angle of view (angle of view) and to facilitate the miniaturization of the six-piece wide-angle lens group to be mounted on a thin electronic product.

With regard to the techniques, means, and other effects of the present invention in order to achieve the above objects, three preferred embodiments are described in detail with reference to the drawings.

<First Embodiment>

1A and FIG. 1B, FIG. 1A is a schematic diagram of a six-piece wide-angle lens group according to a first embodiment of the present invention, and FIG. 1B is a six-piece wide-angle lens group of the first embodiment from left to right. Image curvature and distortion curve. As can be seen from FIG. 1A, the six-piece wide-angle lens group includes an aperture 100 and an optical group. The optical group sequentially includes a first lens 110, a second lens 120, a third lens 130, and a fourth from the object side to the image side. The lens 140, the fifth lens 150, the sixth lens 160, the infrared filter element 170, and the imaging surface 180, wherein the lens having a refractive power in the six-piece wide-angle lens group is six. The aperture 100 is disposed between the object side surface 121 of the second lens 120 and the image side surface 132 of the third lens 130.

The first lens 110 has a negative refractive power and is made of a plastic material. The object side surface 111 is convex at the near optical axis 190, and the image side surface 112 is concave at the near optical axis 190, and the object side surface 111 and the image side are Surface 112 is aspherical.

The second lens 120 has a positive refractive power and is made of a plastic material. The object side surface 121 is a concave surface at the near optical axis 190, and the image side surface 122 is convex at the near optical axis 190, and the object side surface 121 and the image side are Surface 122 is aspherical.

The third lens 130 has a positive refractive power and is made of a plastic material. The object side surface 131 is convex at the near optical axis 190, and the image side surface 132 is convex at the near optical axis 190, and the object side surface 131 and the image side are The surfaces 132 are all aspherical.

The fourth lens 140 has a negative refractive power and is made of a plastic material. The object side surface 141 is convex at the near optical axis 190, and the image side surface 142 is concave at the near optical axis 190, and the object side surface 141 and the image side are Surfaces 142 are all aspherical.

The fifth lens 150 has a positive refractive power and is made of a plastic material. The object side surface 151 is convex at the near optical axis 190, and the image side surface 152 is convex at the near optical axis 190, and the object side surface 151 and the image side are Surface 152 is aspherical.

The sixth lens 160 has a negative refractive power and is made of a plastic material. The object side surface 161 is concave at the near optical axis 190, and the image side surface 162 is concave at the near optical axis 190, and the object side surface 161 and the image side are The surface 162 is aspherical, and the object side surface 161 and the image side surface 162 have at least one surface having at least one inflection point.

The infrared filter element 170 is made of glass and disposed between the sixth lens 160 and the imaging surface 180 without affecting the focal length of the six-piece wide-angle lens group.

The aspherical curve equations of the above lenses are expressed as follows:

Where z is the position value with reference to the surface apex at a position of height h in the direction of the optical axis 190; c is the curvature of the lens surface near the optical axis 190, and is the reciprocal of the radius of curvature (R) (c = 1/R) R is the radius of curvature of the lens surface near the optical axis 190, h is the vertical distance of the lens surface from the optical axis 190, k is a conic constant, and A, B, C, D, E, G, ... are High order aspheric coefficient.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the six-piece wide-angle lens group is f, the aperture value (f-number) of the six-piece wide-angle lens group is Fno, and the maximum magnification of the six-piece wide-angle lens group. The field angle is FOV and its values are as follows: f = 1.902 (mm); Fno = 2.2; and FOV = 140 (degrees).

In the six-piece wide-angle lens group of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the second lens 120 is f2, and the following condition is satisfied: f1/f2 = -0.05.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the second lens 120 is f2, the focal length of the third lens 130 is f3, and the following condition is satisfied: f2/f3 = 38.64.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the third lens 130 is f3, the focal length of the fourth lens 140 is f4, and the following condition is satisfied: f3/f4 = -0.47.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the fourth lens 140 is f4, the focal length of the fifth lens 150 is f5, and the following condition is satisfied: f4/f5 = -1.47.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the fifth lens 150 is f5, the focal length of the sixth lens 160 is f6, and the following condition is satisfied: f5/f6 = -1.17.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the third lens 130 is f3, and the following condition is satisfied: f1/f3 = -1.87.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the second lens 120 is f2, the focal length of the fourth lens 140 is f4, and the following condition is satisfied: f2/f4 = -18.16.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the third lens 130 is f3, the focal length of the fifth lens 150 is f5, and the following condition is satisfied: f3/f5=0.69.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the fourth lens 140 is f4, the focal length of the sixth lens 160 is f6, and the following condition is satisfied: f4/f6=1.71.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the first lens 110 is f1, the combined focal length of the second lens 120 and the third lens 130 is f23, and the following condition is satisfied: f1/f23=-1.93 .

In the six-piece wide-angle lens group of the first embodiment, the combined focal length of the second lens 120 and the third lens 130 is f23, and the combined focal length of the fourth lens 140 and the fifth lens 150 is f45, and the following conditions are satisfied: F23/f45=0.33.

In the six-piece wide-angle lens group of the first embodiment, the composite focal length of the fourth lens 140 and the fifth lens 150 is f45, the focal length of the sixth lens 160 is f6, and the following condition is satisfied: f45/f6=-2.37 .

In the six-piece wide-angle lens group of the first embodiment, the composite focal length of the first lens 110 and the second lens 120 is f12, and the combined focal length of the third lens 130 and the fourth lens 140 is f34, and the following conditions are satisfied: F12/f34=-1.33.

In the six-piece wide-angle lens group of the first embodiment, the combined focal length of the third lens 130 and the fourth lens 140 is f34, and the combined focal length of the fifth lens 150 and the sixth lens 160 is f56, and the following conditions are satisfied: F34/f56=-1.42.

In the six-piece wide-angle lens group of the first embodiment, the focal length of the first lens 110 is f1, and the combined focal length of the second lens 120, the third lens 130, and the fourth lens 140 is f234, and the following condition is satisfied: f1 /f234=-1.29.

In the six-piece wide-angle lens group of the first embodiment, the composite focal length of the second lens 120, the third lens 130, and the fourth lens 140 is f234, and the combined focal length of the fifth lens 150 and the sixth lens 160 is f56. And the following conditions are met: f234/f56=-1.36.

In the six-piece wide-angle lens group of the first embodiment, the composite focal length of the first lens 110, the second lens 120, and the third lens 130 is f123, and the focal length of the fourth lens 140 is f4, and the following conditions are met. :f123/f4=-0.54.

In the six-piece wide-angle lens group of the first embodiment, the composite focal length of the first lens 110, the second lens 120, and the third lens 130 is f123, and the combined focal length of the fourth lens 140 and the fifth lens 150 is f45. And meet the following conditions: f123/f45=0.39.

In the six-piece wide-angle lens group of the first embodiment, the composite focal length of the first lens 110, the second lens 120, and the third lens 130 is f123, and the fourth lens 140, the fifth lens 150, and the sixth lens 160 are The resultant focal length is f456 and the following conditions are met: f123/f456=1.20.

In the six-piece wide-angle lens group of the first embodiment, the composite focal length of the first lens 110 and the second lens 120 is f12, and the third lens 130, the fourth lens 140, the fifth lens 150, and the sixth lens 160 are The resultant focal length is f3456 and the following conditions are met: f12/f3456=-2.26.

In the six-piece wide-angle lens group of the first embodiment, the third lens 130 has a dispersion coefficient of V3, and the fourth lens 140 has a dispersion coefficient of V4 and satisfies the following condition: V3-V4 = 34.6.

In the six-piece wide-angle lens group of the first embodiment, the fifth lens 150 has a dispersion coefficient of V5, and the sixth lens 160 has a dispersion coefficient of V6 and satisfies the following condition: V5 - V6 = 34.6.

In the six-piece wide-angle lens group of the first embodiment, the overall focal length of the six-piece wide-angle lens group is f, and the distance from the object side surface 111 to the imaging surface 180 of the first lens 110 on the optical axis 190 is TL. The following conditions are met: f/TL = 0.40.

Refer to Table 1 and Table 2 below for reference.

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 1</b></td></tr><tr>< Td> first embodiment </td></tr><tr><td><u>f(</u><u>focal length)=1.902 mm (mm), Fno (aperture value) = 2.2, FOV (painting angle) = 140 deg. (degrees)</u></td></tr><tr><td> surface </td><td> </td><td> radius of curvature </td ><td> Thickness</td><td> Material </td><td> Refractive Index </td><td> Dispersion Coefficient </td><td> Focal Length </td></tr><tr> <td> 0 </td><td> Subject </td><td> Unlimited</td><td> Unlimited</td><td> </td><td> </td><td > </td><td> </td></tr><tr><td> 1 </td><td> </td><td> Unlimited</td><td> 0 </td> <td> </td><td> </td><td> </td><td> </td></tr><tr><td> 2 </td><td> first lens< /td><td> 3.707 </td><td> (ASP) </td><td> 0.298 </td><td> Plastic</td><td> 1.544 </td><td> 56.0 < /td><td> -2.71 </td></tr><tr><td> 3 </td><td> </td><td> 1.027 </td><td> (ASP) </ Td><td> 0.514 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 4 < /td><td> Second lens</td><td> -8.964 </td><td> (ASP) </td><td> 0.262 </td><td> Glue</td><td> 1.65 </td><td> 21.4 </td><td> 56.00 </td></tr><tr><td> 5 </td><td> </td ><td> -7.288 </td><td> (ASP) </td><td> 0.109 </td><td> </td><td> </td><td> </td>< Td> </td></tr><tr><td> 6 </td><td> aperture</td><td> infinity</td><td> -0.019 </td><td> < /td><td> </td><td> </td><td> </td></tr><tr><td> 7 </td><td> third lens</td>< Td> 2.755 </td><td> (ASP) </td><td> 0.595 </td><td> Plastic</td><td> 1.544 </td><td> 56.0 </td>< Td> 1.45 </td></tr><tr><td> 8 </td><td> </td><td> -1.025 </td><td> (ASP) </td><td > 0.028 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 9 </td>< Td> fourth lens</td><td> 2.805 </td><td> (ASP) </td><td> 0.243 </td><td> plastic</td><td> 1.65 </td ><td> 21.4 </td><td> -3.08 </td></tr><tr><td> 10 </td><td> </td><td> 1.135 </td><td > (ASP) </td><td> 0.136 </td><td> </td><td> </td><td> </td><td> </td></tr><tr ><td> 11 </td><td> Fifth lens</td><td> 8.006 </td><td> (ASP) </td><td> 0.877 </td><td> Plastic< /td><td> 1.544 </ Td><td> 56.0 </td><td> 2.10 </td></tr><tr><td> 12 </td><td> </td><td> -1.289 </td>< Td> (ASP) </td><td> 0.721 </td><td> </td><td> </td><td> </td><td> </td></tr>< Tr><td> 13 </td><td> sixth lens</td><td> -5.062 </td><td> (ASP) </td><td> 0.308 </td><td> Plastic</td><td> 1.65 </td><td> 21.4 </td><td> -1.81 </td></tr><tr><td> 14 </td><td> </ Td><td> 1.582 </td><td> (ASP) </td><td> 0.264 </td><td> </td><td> </td><td> </td>< Td> </td></tr><tr><td> 15 </td><td> Infrared Filter Filter </td><td> Unlimited</td><td> 0.210 </td> <td> Glass</td><td> 1.517 </td><td> 64.2 </td><td> - </td></tr><tr><td> 16 </td><td> </td><td> Unlimited</td><td> 0.184 </td><td> </td><td> </td><td> </td><td> </td></ Tr><tr><td> 17 </td><td> imaging surface </td><td> infinity</td><td> infinity</td><td> </td><td> </ Td><td> </td><td> </td></tr></TBODY></TABLE>

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 2</b></td></tr><tr>< Td> aspherical coefficient </td></tr><tr><td> plane</td><td> 2 </td><td> 3 </td><td> 4 </td><td > 5 </td><td> 7 </td><td> 8 </td></tr><tr><td> K: </td><td> 2.5708E+00 </td>< Td> -3.6591E-01 </td><td> 1.4128E+02 </td><td> 9.1079E+01 </td><td> -1.9131E+00 </td><td> -2.6566 E+00 </td></tr><tr><td> A: </td><td> 1.4115E-02 </td><td> 1.7208E-01 </td><td> -2.2807 E-01 </td><td> -2.0772E-01 </td><td> -2.3480E-02 </td><td> -6.9430E-03 </td></tr><tr> <td> B: </td><td> 1.0027E-01 </td><td> 3.8341E-01 </td><td> 5.6790E-03 </td><td> -2.1946E-01 </td><td> -5.3288E-01 </td><td> -1.4222E+00 </td></tr><tr><td> C: </td><td> -1.7290E -01 </td><td> 1.5790E-01 </td><td> -5.4852E-01 </td><td> 5.0992E-02 </td><td> 2.7965E+00 </td ><td> 4.8118E+00 </td></tr><tr><td> D: </td><td> 1.4304E-01 </td><td> 9.2949E-01 </td> <td> 2.2361E+00 </td><td> 1.1123E+01 </td><td> -1.0727E+01 </td><td> -1.0506E+01 </td></tr> <tr><td> E: </td><td> -6 .1235E-02 </td><td> -3.9031E+00 </td><td> -2.8883E+00 </td><td> -4.0827E+01 </td><td> 2.3166E+ 01 </td><td> 1.1634E+01 </td></tr><tr><td> F: </td><td> 1.0963E-02 </td><td> 7.1675E+00 </td><td> 2.6282E+00 </td><td> 5.2772E+01 </td><td> -1.8168E+01 </td><td> -3.9539E+00 </td> </tr><tr><td> Plane</td><td> 9 </td><td> 10 </td><td> 11 </td><td> 12 </td><td> 13 </td><td> 14 </td></tr><tr><td> K: </td><td> 8.8458E+00 </td><td> -7.7049E+00 </ Td><td> -1.1811E+00 </td><td> -8.9914E-01 </td><td> 1.2070E+01 </td><td> -1.7129E+01 </td>< /tr><tr><td> A: </td><td> -4.4931E-01 </td><td> -6.2864E-02 </td><td> 6.7540E-03 </td> <td> 3.1845E-02 </td><td> -4.2305E-01 </td><td> -1.8983E-01 </td></tr><tr><td> B: </td ><td> -5.2471E-01 </td><td> -7.9497E-02 </td><td> 6.9941E-02 </td><td> -7.1807E-02 </td><td > 4.1613E-01 </td><td> 1.4482E-01 </td></tr><tr><td> C: </td><td> 2.7367E+00 </td><td> 2.8358E-01 </td><td> -7.0811E-02 </td><td> 1.2517E-01 </td><td> -2.6934E-01 </td><td> -7.6514E- 02 </td></tr><tr><td> D: < /td><td> -7.5253E+00 </td><td> -3.8051E-01 </td><td> 5.9930E-02 </td><td> -1.6161E-01 </td> <td> 2.3730E-02 </td><td> 1.8270E-02 </td></tr><tr><td> E: </td><td> 1.0598E+01 </td>< Td> 3.1313E-01 </td><td> -1.7155E-02 </td><td> 9.9040E-02 </td><td> 2.2149E-02 </td><td> -1.5900E -03 </td></tr><tr><td> F: </td><td> -5.6839E+00 </td><td> -1.2103E-01 </td><td> - 1.3690E-03 </td><td> -1.1160E-03 </td><td> 0.0000E+00 </td><td> 0.0000E+00 </td></tr></TBODY> </TABLE>

Table 1 is the detailed structural data of the first embodiment of Fig. 1A, in which the unit of curvature radius, thickness and focal length is mm, and the surfaces 0-17 sequentially represent the surface from the object side to the image side. Table 2 is the aspherical data in the first embodiment, wherein the cone coefficients in the a-spherical curve equation of k, A, B, C, D, E, F, ... are high-order aspheric coefficients. In addition, the tables in the following embodiments correspond to the schematic diagrams of the respective embodiments and the curvature of field and the distortion diagram of the distortion, and the definitions of the data in the table are the same as those of Tables 1 and 2 of the first embodiment, and Add a statement.

<Second embodiment>

2A and FIG. 2B, FIG. 2A is a schematic diagram of a six-piece wide-angle lens group according to a second embodiment of the present invention, and FIG. 2B is a six-piece wide-angle lens group of the second embodiment from left to right. Image curvature and distortion curve. As can be seen from FIG. 2A, the six-piece wide-angle lens assembly includes an aperture 200 and an optical group. The optical group includes a first lens 210, a second lens 220, a third lens 230, and a fourth from the object side to the image side. The lens 240, the fifth lens 250, the sixth lens 260, the infrared filter element 270, and the imaging surface 280, wherein the lens of the six-piece wide-angle lens group has six refractive powers. The aperture 200 is disposed between the object side surface 221 of the second lens 220 and the image side surface 232 of the third lens 230.

The first lens 210 has a negative refractive power and is made of a plastic material. The object side surface 211 is convex at the near optical axis 290, and the image side surface 212 is concave at the near optical axis 290, and the object side surface 211 and the image side are Surface 212 is aspherical.

The second lens 220 has a positive refractive power and is made of a plastic material. The object side surface 221 is concave at the near optical axis 290, and the image side surface 222 is convex at the near optical axis 290, and the object side surface 221 and the image side are Surfaces 222 are all aspherical.

The third lens 230 has a positive refractive power and is made of a plastic material. The object side surface 231 is convex at the near optical axis 290, and the image side surface 232 is convex at the near optical axis 290, and the object side surface 231 and the image side are Surfaces 232 are all aspherical.

The fourth lens 240 has a negative refractive power and is made of a plastic material. The object side surface 241 is convex at the near optical axis 290, and the image side surface 242 is concave at the near optical axis 290, and the object side surface 241 and the image side are Surface 242 is aspherical.

The fifth lens 250 has a positive refractive power and is made of a plastic material. The object side surface 251 is convex at the near optical axis 290, and the image side surface 252 is convex at the near optical axis 290, and the object side surface 251 and the image side are Surface 252 is aspherical.

The sixth lens 260 has a negative refractive power and is made of a plastic material. The object side surface 261 is concave at the near optical axis 290, and the image side surface 262 is concave at the near optical axis 290, and the object side surface 261 and the image side are The surface 262 is aspherical, and the object side surface 261 and the image side surface 262 have at least one surface having at least one inflection point.

The infrared filter element 270 is made of glass and disposed between the sixth lens 260 and the imaging surface 280 without affecting the focal length of the six-piece wide-angle lens group.

Refer to Table 3 and Table 4 below.

<TABLE border="1"borderColor="#000000"width="85%"><TBODY><tr><td><b>Table4</b></td></tr><tr><Td> D: </td><td> -7.5226E+00 </td><td> -3.8497E-01 </td><td> 5.9421E-02 </td><td> -1.5877E- 01 </td><td> 2.4638E-02 </td><td> 1.8242E-02 </td></tr><tr><td> E: </td><td> 1.0609E+01 </td><td> 3.1046E-01 </td><td> -1.6465E-02 </td><td> 1.0089E-01 </td><td> 2.2721E-02 </td><Td> -1.5930E-03 </td></tr><tr><td> F: </td><td> -5.6778E+00 </td><td> -1.1765E-01 </td ><td> 0.0000E+00 </td><td> 0.0000E+00 </td><td> 0.0000E+00 </td><td> 0.0000E+00 </td></tr></TBODY></TABLE>

In the second embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

With Table 3 and Table 4, the following data can be derived:

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Second embodiment</td></tr><tr><td> f[mm ] </td><td> 1.887 </td><td> f23/f45 </td><td> 0.35 </td></tr><tr><td> Fno </td><td> 2.2 </td><td> f45/f6 </td><td> -2.30 </td></tr><tr><td> FOV[deg.] </td><td> 145 </td> <td> f12/f34 </td><td> -1.31 </td></tr><tr><td> f1/f2 </td><td> -0.02 </td><td> f34/ F56 </td><td> -1.35 </td></tr><tr><td> f2/f3 </td><td> 76.44 </td><td> f1/f234 </td>< Td> -1.29 </td></tr><tr><td> f3/f4 </td><td> -0.44 </td><td> f234/f56 </td><td> -1.32 < /td></tr><tr><td> f4/f5 </td><td> -1.55 </td><td> f123/f4 </td><td> -0.52 </td></ Tr><tr><td> f5/f6 </td><td> -1.18 </td><td> f123/f45 </td><td> 0.41 </td></tr><tr>< Td> f1/f3 </td><td> -1.86 </td><td> f123/f456 </td><td> 1.24 </td></tr><tr><td> f2/f4 < /td><td> -33.94 </td><td> f12/f3456 </td><td> -2.24 </td></tr><tr><td> f3/f5 </td><td > 0.69 </td><td> V3-V4 </td><td> 34.6 </td></tr><tr><td> f4/f6 </td><td> 1.83 </td>< Td> V5-V6 </td><td> 34.6 </td></tr><tr><td> f1/f 23 </td><td> -1.89 </td><td> f/TL </td><td> 0.40 </td></tr></TBODY></TABLE>

<Third embodiment>

Please refer to FIG. 3A and FIG. 3B , wherein FIG. 3A is a schematic diagram of a six-piece wide-angle lens group according to a third embodiment of the present invention, and FIG. 3B is a six-piece wide-angle lens of the third embodiment from left to right. Group image curvature and distortion curve. As can be seen from FIG. 3A, the six-piece wide-angle lens assembly includes an aperture 300 and an optical group. The optical group includes a first lens 310, a second lens 320, a third lens 330, and a fourth from the object side to the image side. The lens 340, the fifth lens 350, the sixth lens 360, and the imaging surface 380, wherein the lens having a refractive power in the six-piece wide-angle lens group is six. The aperture 300 is disposed between the object side surface 321 of the second lens 320 and the image side surface 332 of the third lens 330.

The first lens 310 has a negative refractive power and is made of a plastic material. The object side surface 311 is convex at the near optical axis 390, and the image side surface 312 is concave at the near optical axis 390, and the object side surface 311 and the image side are Surfaces 312 are all aspherical.

The second lens 320 has a positive refractive power and is made of a plastic material. The object side surface 321 is concave at the near optical axis 390, and the image side surface 322 is convex at the near optical axis 390, and the object side surface 321 and the image side are Surfaces 322 are all aspherical.

The third lens 330 has a positive refractive power and is made of a plastic material. The object side surface 331 is convex at the near optical axis 390, and the image side surface 332 is convex at the near optical axis 390, and the object side surface 331 and the image side are Surface 332 is aspherical.

The fourth lens 340 has a negative refractive power and is made of a plastic material. The object side surface 341 is convex at the near optical axis 390, and the image side surface 342 is concave at the near optical axis 390, and the object side surface 341 and the image side are Surfaces 342 are all aspherical.

The fifth lens 350 has a positive refractive power and is made of a plastic material. The object side surface 351 is convex at the near optical axis 390, and the image side surface 352 is convex at the near optical axis 390, and the object side surface 351 and the image side are Surfaces 352 are all aspherical.

The sixth lens 360 has a negative refractive power and is made of a plastic material. The object side surface 361 is concave at the near optical axis 390, and the image side surface 362 is concave at the near optical axis 390, and the object side surface 361 and the image side are The surface 362 is aspherical, and both the object side surface 361 and the image side surface 362 have more than one inflection point.

The infrared filter element 370 is made of glass and disposed between the sixth lens 360 and the imaging surface 380 without affecting the focal length of the six-piece wide-angle lens group.

Refer to Table 5 and Table 6 below for reference.

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 5</b></td></tr><tr>< Td> Third embodiment </td></tr><tr><td><u>f(</u><u>focal length) =1.912 mm (mm), Fno (aperture value) = 2.2, FOV (painting angle) = 145 deg. (degrees)</u></td></tr><tr><td> surface </td><td> </td><td> radius of curvature </td ><td> Thickness</td><td> Material </td><td> Refractive Index </td><td> Dispersion Coefficient </td><td> Focal Length </td></tr><tr> <td> 0 </td><td> Subject </td><td> Unlimited</td><td> Unlimited</td><td> </td><td> </td><td > </td><td> </td></tr><tr><td> 1 </td><td> </td><td> Unlimited</td><td> 0 </td> <td> </td><td> </td><td> </td><td> </td></tr><tr><td> 2 </td><td> first lens< /td><td> 0.877 </td><td> (ASP) </td><td> 0.272 </td><td> Plastic </td><td> 1.544 </td><td> 56 < /td><td> -3.15 </td></tr><tr><td> 3 </td><td> </td><td> 0.517 </td><td> (ASP) </ Td><td> 0.668 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 4 < /td><td> Second lens</td><td> -11.987 </td><td> (ASP) </td><td> 0.244 </td><td> Glue</td><td> 1.65 </td><td> 21.4 </td><td> 233.51 </td></tr><tr><td> 5 </td><td> </td ><td> -11.208 </td><td> (ASP) </td><td> 0.035 </td><td> </td><td> </td><td> </td>< Td> </td></tr><tr><td> 6 </td><td> aperture</td><td> infinity</td><td> 0.002 </td><td> </ Td><td> </td><td> </td><td> </td></tr><tr><td> 7 </td><td> third lens</td><td > 2.139 </td><td> (ASP) </td><td> 0.640 </td><td> Plastic</td><td> 1.544 </td><td> 56 </td><td > 1.48 </td></tr><tr><td> 8 </td><td> </td><td> -1.158 </td><td> (ASP) </td><td> 0.026 </td><td> </td><td> </td><td> </td><td> </td></tr><tr><td> 9 </td><td > Fourth lens</td><td> 3.456 </td><td> (ASP) </td><td> 0.235 </td><td> Plastic </td><td> 1.634 </td> <td> 23.9 </td><td> -3.45 </td></tr><tr><td> 10 </td><td> </td><td> 1.312 </td><td> (ASP) </td><td> 0.152 </td><td> </td><td> </td><td> </td><td> </td></tr><tr> <td> 11 </td><td> Fifth lens</td><td> 4.877 </td><td> (ASP) </td><td> 0.929 </td><td> Plastic </ Td><td> 1.544 </t d><td> 56 </td><td> 1.97 </td></tr><tr><td> 12 </td><td> </td><td> -1.292 </td>< Td> (ASP) </td><td> 0.441 </td><td> </td><td> </td><td> </td><td> </td></tr>< Tr><td> 13 </td><td> sixth lens</td><td> -23.817 </td><td> (ASP) </td><td> 0.368 </td><td> Plastic</td><td> 1.634 </td><td> 23.9 </td><td> -2.02 </td></tr><tr><td> 14 </td><td> </ Td><td> 1.373 </td><td> (ASP) </td><td> 0.251 </td><td> </td><td> </td><td> </td>< Td> </td></tr><tr><td> 15 </td><td> Infrared Filter Filter </td><td> Unlimited</td><td> 0.210 </td> <td> Glass</td><td> 1.517 </td><td> 64.2 </td><td> - </td></tr><tr><td> 16 </td><td> </td><td> Unlimited</td><td> 0.257 </td><td> </td><td> </td><td> </td><td> </td></ Tr><tr><td> 17 </td><td> imaging surface </td><td> infinity</td><td> infinity</td><td> </td><td> </ Td><td> </td><td> </td></tr></TBODY></TABLE>

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td><b>Table 6</b></td></tr><tr>< Td> aspherical coefficient </td></tr><tr><td> plane</td><td> 2 </td><td> 3 </td><td> 4 </td><td > 5 </td><td> 7 </td><td> 8 </td></tr><tr><td> K: </td><td> -1.5821E+00 </td> <td> -8.9762E-01 </td><td> 3.1561E+02 </td><td> 3.9538E+02 </td><td> -3.0513E+00 </td><td> - 1.5858E+00 </td></tr><tr><td> A: </td><td> -4.9534E-02 </td><td> -3.3950E-02 </td><td > -5.7361E-02 </td><td> -1.1690E-01 </td><td> -8.8785E-02 </td><td> -9.7250E-02 </td></tr> <tr><td> B: </td><td> -3.6307E-02 </td><td> 1.7464E-01 </td><td> -1.8207E-01 </td><td> -1.4259E-01 </td><td> -4.4975E-02 </td><td> -5.2890E-01 </td></tr><tr><td> C: </td>< Td> 4.2120E-03 </td><td> 5.4768E-01 </td><td> 5.2552E-01 </td><td> 1.9392E+00 </td><td> 1.3814E-02 </td><td> 1.6500E-01 </td></tr><tr><td> D: </td><td> 1.7140E-03 </td><td> -6.8276E-01 </td><td> -1.4485E-01 </td><td> -3.2098E-01 </td><td> -4.7825E-01 </td><td> 3.3783E-01 </td ></tr><tr><td> E: </td><t d> 5.5800E-04 </td><td> -2.0195E-01 </td><td> 1.6793E-01 </td><td> -1.4500E+01 </td><td> -5.1366 E-01 </td><td> -4.5128E-02 </td></tr><tr><td> F: </td><td> 9.9200E-04 </td><td> 7.8738 E-01 </td><td> 4.6997E-01 </td><td> 4.2726E+01 </td><td> 1.2106E+00 </td><td> -1.3203E+00 </ Td></tr><tr><td> plane</td><td> 9 </td><td> 10 </td><td> 11 </td><td> 12 </td>< Td> 13 </td><td> 14 </td></tr><tr><td> K: </td><td> 1.0409E+01 </td><td> -6.5737E+00 </td><td> 3.2539E-01 </td><td> -8.7525E-01 </td><td> 3.6082E+02 </td><td> -9.3767E+00 </td> </tr><tr><td> A: </td><td> -4.4939E-01 </td><td> -1.3627E-01 </td><td> -6.1480E-03 </ Td><td> 8.5663E-02 </td><td> -2.7309E-01 </td><td> -9.5048E-02 </td></tr><tr><td> B: < /td><td> -2.4826E-02 </td><td> 1.2875E-01 </td><td> -1.1717E-02 </td><td> -8.7979E-02 </td> <td> 4.2085E-02 </td><td> 1.4529E-02 </td></tr><tr><td> C: </td><td> -4.2928E-02 </td> <td> -5.3011E-02 </td><td> 2.6033E-02 </td><td> 6.4860E-03 </td><td> -6.6069E-02 </td><td> - 3.6610E-03 </td></tr><tr><td> D: </td><td> -7.0733E-02 </td><td> 3.0473E-02 </td><td> -6.0630E-03 </td><td> 6.2410E-03 </ Td><td> 2.0121E-02 </td><td> 2.1600E-04 </td></tr><tr><td> E: </td><td> 2.0579E-01 </td ><td> -1.3853E-02 </td><td> -3.8620E-03 </td><td> 7.9780E-03 </td><td> 3.1220E-03 </td><td> 6.2000E-05 </td></tr><tr><td> F: </td><td> 1.2899E-01 </td><td> 3.9400E-04 </td><td> 0.0000 E+00 </td><td> 0.0000E+00 </td><td> 0.0000E+00 </td><td> 0.0000E+00 </td></tr></TBODY></ TABLE>

In the third embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

With Table 5 and Table 6, the following data can be derived:

<TABLE border="1" borderColor="#000000" width="85%"><TBODY><tr><td> Third Embodiment</td></tr><tr><td> f[mm ] </td><td> 1.912 </td><td> f23/f45 </td><td> 0.44 </td></tr><tr><td> Fno </td><td> 2.2 </td><td> f45/f6 </td><td> -1.66 </td></tr><tr><td> FOV[deg.] </td><td> 145 </td> <td> f12/f34 </td><td> -1.52 </td></tr><tr><td> f1/f2 </td><td> -0.01 </td><td> f34/ F56 </td><td> -0.86 </td></tr><tr><td> f2/f3 </td><td> 158.16 </td><td> f1/f234 </td>< Td> -1.51 </td></tr><tr><td> f3/f4 </td><td> -0.43 </td><td> f234/f56 </td><td> -0.85 < /td></tr><tr><td> f4/f5 </td><td> -1.75 </td><td> f123/f4 </td><td> -0.53 </td></ Tr><tr><td> f5/f6 </td><td> -0.98 </td><td> f123/f45 </td><td> 0.55 </td></tr><tr>< Td> f1/f3 </td><td> -2.13 </td><td> f123/f456 </td><td> 1.33 </td></tr><tr><td> f2/f4 < /td><td> -67.71 </td><td> f12/f3456 </td><td> -2.41 </td></tr><tr><td> f3/f5 </td><td > 0.75 </td><td> V3-V4 </td><td> 32.03 </td></tr><tr><td> f4/f6 </td><td> 1.71 </td>< Td> V5-V6 </td><td> 32.03 </td></tr><tr><td> f 1/f23 </td><td> -2.16 </td><td> f/TL </td><td> 0.40 </td></tr></TBODY></TABLE>

The six-piece wide-angle lens group provided by the invention can be made of plastic or glass. When the lens material is plastic, the production cost can be effectively reduced. When the lens is made of glass, the six-piece wide-angle lens group can be increased. The freedom of force configuration. In addition, the object side surface and the image side surface of the lens in the six-piece wide-angle lens group may be aspherical, and the aspheric surface can be easily formed into a shape other than the spherical surface, and more control variables are obtained to reduce the aberration and thereby reduce the lens. The number used, and thus the total length of the six-piece wide-angle lens group of the present invention can be effectively reduced.

In the six-piece wide-angle lens group provided by the present invention, in the case of a lens having a refractive power, if the surface of the lens is convex and the position of the convex surface is not defined, it indicates that the surface of the lens is convex at the near optical axis; When the lens surface is concave and the concave position is not defined, it indicates that the lens surface is concave at the near optical axis.

The six-piece wide-angle lens group provided by the invention is more suitable for the optical system of moving focus, and has the characteristics of excellent aberration correction and good imaging quality, and can be applied to 3D (three-dimensional) image capturing and digital in various aspects. In electronic imaging systems such as cameras, mobile devices, digital tablets or car photography.

In the above, the above embodiments and drawings are only the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention are all It should be within the scope of the patent of the present invention.

100, 200, 300‧ ‧ aperture
110, 210, 310‧‧‧ first lens
111, 211, 311‧‧‧ ‧ side surface
112, 212, 312‧‧‧ side surface
120, 220, 320‧‧‧ second lens
121, 221, 321‧‧‧ ‧ side surface
122, 222, 322‧‧‧ image side surface
130, 230, 330‧‧‧ third lens
131, 231, 331‧‧‧ ‧ side surface
132, 232, 332‧‧‧ image side surface
140, 240, 340‧ ‧ fourth lens
141, 241, 341‧‧‧ ‧ side surface
142, 242, 342‧‧‧ image side surface
150, 250, 350‧‧‧ fifth lens
151, 251, 351‧‧‧ ‧ side surface
152, 252, 352‧‧‧ side surface
160, 260, 360‧‧‧ sixth lens
161, 261, 361‧‧ ‧ side surface
162, 262, 362‧‧‧ side surface
170, 270, 370‧‧‧ Infrared filtering filter elements
180, 280, 380‧‧ ‧ imaging surface
190, 290, 390‧‧‧ optical axis
f‧‧‧Focus of the six-piece wide-angle lens group
Aperture value of Fno‧‧‧ six-piece wide-angle lens group
Maximum field of view in the FOV‧‧‧ six-piece wide-angle lens group
F1‧‧‧The focal length of the first lens
F2‧‧‧The focal length of the second lens
f3‧‧‧The focal length of the third lens
F4‧‧‧The focal length of the fourth lens
f5‧‧‧Focus of the fifth lens
F6‧‧‧The focal length of the sixth lens
F12‧‧‧Combined focal length of the first lens and the second lens
F23‧‧‧Combined focal length of the second lens and the third lens
F34‧‧‧Combined focal length of the third lens and the fourth lens
F45‧‧‧Combined focal length of the fourth lens and the fifth lens
f56‧‧‧Combined focal length of the fifth lens and the sixth lens
F123‧‧‧Combined focal length of the first lens, the second lens and the third lens
f234‧‧‧Combined focal length of the second lens, the third lens and the fourth lens
f456‧‧‧Combined focal length of the fourth lens, the fifth lens and the sixth lens
f3456‧‧‧Combined focal length of the third lens, the fourth lens, the fifth lens and the sixth lens
V3‧‧‧Dispersion coefficient of the third lens
V4‧‧‧Dispersion coefficient of the fourth lens
Dispersion coefficient of V5‧‧‧ fifth lens
V6‧‧‧ sixth lens lens dispersion coefficient
TL‧‧‧The distance from the object side surface of the first lens to the imaging surface on the optical axis

Fig. 1A is a schematic view showing a six-piece wide-angle lens group according to a first embodiment of the present invention. Fig. 1B is a graph showing the curvature of field and the distortion of the distortion of the six-piece wide-angle lens group of the first embodiment from left to right. 2A is a schematic view of a six-piece wide-angle lens group according to a second embodiment of the present invention. 2B is a graph showing the curvature of field and the distortion of the distortion of the six-piece wide-angle lens group of the second embodiment from left to right. Fig. 3A is a schematic view showing a six-piece wide-angle lens group according to a third embodiment of the present invention.

Fig. 3B is a graph showing the curvature of field and the distortion of the distortion of the six-piece wide-angle lens group of the third embodiment from left to right.

Claims (23)

A six-piece wide-angle lens group comprising, in order from the object side to the image side, a first lens having a negative refractive power, a convex surface of the object side surface near the optical axis, and a concave surface at the near-optical axis of the image side surface. At least one surface of the object side surface and the image side surface is aspherical; a second lens has a positive refractive power, and the object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis, and the object side thereof At least one surface of the surface and the image side surface is aspherical; an aperture; a third lens having a positive refractive power, the object side surface being convex at the near optical axis, and the image side surface being convex at the near optical axis, the object side thereof At least one surface of the surface and the image side surface is aspherical; a fourth lens has a negative refractive power, and the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis, and the object side surface and image thereof At least one surface of the side surface is aspherical; a fifth lens has a positive refractive power, and the object side surface is convex at a near optical axis, and the image side surface is convex at a near optical axis, and the object side surface and the image side surface are at least One surface is aspherical; a sixth lens has negative refractive power The object side surface has a concave surface at a near optical axis, and the image side surface has a concave surface at a near optical axis, and at least one surface of the object side surface and the image side surface is aspherical, and at least one surface of the object side surface and the image side surface has at least one surface. An inflection point; wherein the focal length of the second lens is f2, the focal length of the third lens is f3, and the following condition is satisfied: 25 < f2 / f3 < 180. The six-piece wide-angle lens group according to claim 1, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, and the following condition is satisfied: -0.1 < f1/f2 < -0.005. The six-piece wide-angle lens group according to claim 1, wherein the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the following condition is satisfied: -0.6 < f3 / f4 < - 0.25. The six-piece wide-angle lens group according to claim 1, wherein the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, and the following condition is satisfied: -1.9 < f4 / f5 < -1.3. The six-piece wide-angle lens group according to claim 1, wherein the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the following condition is satisfied: -1.3 < f5 / f6 < - 0.8. The six-piece wide-angle lens group according to claim 1, wherein the focal length of the first lens is f1, the focal length of the third lens is f3, and the following condition is satisfied: -2.3 < f1/f3 < -1.7. The six-piece wide-angle lens group according to claim 1, wherein the focal length of the second lens is f2, the focal length of the fourth lens is f4, and the following condition is satisfied: -70 < f2 / f4 < -15. The six-piece wide-angle lens group according to claim 1, wherein the focal length of the third lens is f3, the focal length of the fifth lens is f5, and the following condition is satisfied: 0.5 < f3 / f5 < 0.9. The six-piece wide-angle lens group according to claim 1, wherein the focal length of the fourth lens is f4, the focal length of the sixth lens is f6, and the following condition is satisfied: 1.5 < f4 / f6 < 2.0. The six-piece wide-angle lens group according to claim 1, wherein the focal length of the first lens is f1, and the combined focal length of the second lens and the third lens is f23, and the following condition is satisfied: -2.4<f1/f23 <-1.65. The six-piece wide-angle lens group according to claim 1, wherein the combined focal length of the second lens and the third lens is f23, and the combined focal length of the fourth lens and the fifth lens is f45, and the following condition is satisfied: 0.15< F23/f45<0.6. The six-piece wide-angle lens group according to claim 1, wherein the fourth lens and the fifth lens have a combined focal length of f45, the sixth lens has a focal length of f6, and satisfies the following condition: -2.6<f45/f6< -1.4. The six-piece wide-angle lens group according to claim 1, wherein the combined focal length of the first lens and the second lens is f12, and the combined focal length of the third lens and the fourth lens is f34, and the following condition is satisfied: -1.7 <f12/f34<-1.1. The six-piece wide-angle lens group according to claim 1, wherein the combined focal length of the third lens and the fourth lens is f34, and the combined focal length of the fifth lens and the sixth lens is f56, and the following condition is satisfied: -1.6 <f34/f56<-0.65. The six-piece wide-angle lens group according to claim 1, wherein a focal length of the first lens is f1, a combined focal length of the second lens, the third lens, and the fourth lens is f234, and the following condition is satisfied: -1.8< F1/f234<-1.0. The six-piece wide-angle lens group according to claim 1, wherein the second lens, the third lens and the fourth lens have a combined focal length of f234, and the fifth lens and the sixth lens have a combined focal length of f56, and satisfy the following Conditions: -1.6 <f234/f56 <-0.6. The six-piece wide-angle lens group according to claim 1, wherein the first lens, the second lens and the third lens have a combined focal length of f123, the fourth lens has a focal length of f4, and satisfies the following condition: -0.65< F123/f4<-0.35. The six-piece wide-angle lens group according to claim 1, wherein the first lens, the second lens and the third lens have a combined focal length of f123, and the fourth lens and the fifth lens have a combined focal length of f45, and satisfy the following Condition: 0.2 < f123 / f45 < 0.75. The six-piece wide-angle lens group according to claim 1, wherein the first lens, the second lens and the third lens have a combined focal length of f123, and the fourth lens, the fifth lens and the sixth lens have a combined focal length of f456. And meet the following conditions: 1.0 < f123 / f456 < 1.55. The six-piece wide-angle lens group according to claim 1, wherein the combined focal length of the first lens and the second lens is f12, and the combined focal length of the third lens, the fourth lens, the fifth lens and the sixth lens is f3456 And meet the following conditions: -2.7 <f12/f3456 <-1.95. The six-piece wide-angle lens group according to claim 1, wherein the third lens has a dispersion coefficient of V3, the fourth lens has a dispersion coefficient of V4, and satisfies the following condition: 30<V3-V4<42. The six-piece wide-angle lens group according to claim 1, wherein the fifth lens has a dispersion coefficient of V5, the sixth lens has a dispersion coefficient of V6, and satisfies the following condition: 30 < V5 - V6 < 42. The six-piece wide-angle lens group according to claim 1, wherein the overall focal length of the six-piece wide-angle lens group is f, and the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and satisfies The following conditions are: 0.25 < f / TL < 0.6.