TWM534825U - Five-piece wide-angle lens - Google Patents

Description

Five-piece wide-angle lens

This creation relates to an optical system, and more particularly to a five-piece imaging lens having a wide-angle characteristic.

Automotive lenses usually need to have wide-angle characteristics. For example, TW 201544841 and TW M496135 both disclose wide-angle lenses for vehicles and explore how to ensure image quality in environments with large temperature variations. On the other hand, how to further make such a wide-angle lens for vehicles have better correction aberrations and correction of chromatic aberration, and even further achieve the goal of miniaturization, it is still worth considering in the field.

The main purpose of this creation is to provide a five-piece imaging lens with modified aberration function, good imaging quality and good temperature performance.

In order to achieve the above and other objects, the present invention provides a five-piece wide-angle lens that sequentially includes a first lens, a second lens, a third lens, an aperture, a fourth lens, and a first side from the object side to the image side. The fifth lens. The first lens has a negative refractive power, the object side is convex and the image side is concave, the second lens has negative refractive power, the object side and the image side are concave, and the third and fourth lenses each have positive refractive power, and both The object side surface and the image side surface are both convex surfaces, and the fifth lens has a negative refractive power, and the object side surface is a concave surface and the image side surface is a convex surface. Wherein, the five-piece wide-angle lens also satisfies the following relationship: -12<(f1×f2/f3)/(f4/f5)<-6; wherein f1 is the focal length value of the first lens, and f2 is the second lens The focal length value, f3 is the focal length value of the third lens, f4 is the focal length value of the fourth lens, and f5 is the focal length value of the fifth lens. With the foregoing design, the refractive power configuration of the front and rear mirror groups can be balanced, thereby reducing system aberrations.

In order to achieve the above and other objects, the present invention also provides a five-piece wide-angle lens including a first lens, a second lens, a third lens, an aperture, and a fourth lens from the object side to the image side. A fifth lens. The first lens has a negative refractive power, the radius of curvature of the object side surface is a positive value, and the radius of curvature of the image side surface is a positive value; the second lens has a negative refractive power, the radius of curvature of the object side surface is a negative value, and the curvature of the object side surface The radius of the radius is smaller than the radius of curvature of the side of the image; the third lens has a positive refractive power, the radius of curvature of the image side is negative, and the radius of curvature of the side of the object is larger than the radius of curvature of the side of the image; the fourth lens has a positive refractive power, The radius of curvature of the side surface is positive, and the radius of curvature of the side of the object is larger than the radius of curvature of the side of the image; the fifth lens has a negative refractive power, the radius of curvature of the side of the object is negative, and the radius of curvature of the image side is also negative. . Wherein, the five-piece wide-angle lens also satisfies the following relationship: -12<(f1×f2/f3)/(f4/f5)<-6; wherein f1 is the focal length value of the first lens, and f2 is the second lens The focal length value, f3 is the focal length value of the third lens, f4 is the focal length value of the fourth lens, and f5 is the focal length value of the fifth lens. With the foregoing design, the refractive power configuration of the front and rear mirror groups can be balanced, thereby reducing system aberrations.

The above five-piece wide-angle lens can satisfy the following relationship: -1 < (f4 + f5) × d45 < 0; wherein d45 is the distance between the fourth and fifth lenses on an optical axis, thereby correcting the system chromatic aberration.

The above five-piece wide-angle lens can satisfy the following relationship: 0.4 < ∣f4 / f5 ∣ < 2; thereby, the effect of correcting aberration can be achieved.

The above five-piece wide-angle lens can satisfy the following relationship: 0.70<T15/TTL<1; wherein T15 is the distance between the side of the first lens object and the side of the fifth lens image on an optical axis, and the TTL is the five-piece type. The full-length system of the wide-angle lens allows the five-piece wide-angle lens to be miniaturized.

The above five-piece wide-angle lens can satisfy the following relationship: 1.8<(f2+f3)/d23<4.5; wherein d23 is the distance between the second and third lenses on an optical axis, thereby allowing light to pass through The second and third lenses have a smaller turning point, reducing system manufacturing sensitivity.

The above five-piece wide-angle lens can satisfy the following relationship: -20<(R5×R6)/f3<-10; wherein R5 is the radius of curvature of the side of the third lens object, and R6 is the radius of curvature of the side surface of the third lens image. In this way, the required refractive power in front of the aperture can be balanced to correct the system aberration.

The aforementioned five-piece wide-angle lens can satisfy the following relationship: -4 < (f2 + f3) / (f4 + f5) < -1; thereby reducing system sensitivity.

In the above five-piece wide-angle lens, the first lens may be a glass lens, and the second to fifth lenses may be plastic lenses and both sides are aspherical, and both are non-glued lenses. This helps to reduce costs.

The above five-piece wide-angle lens can satisfy the following relationship: 10<R1/F<15; 1<R2/F<5; -0.2<F/f1<-0.1;-18<R3/F<-5;1< R4/F<3; -0.4<F/f2<-0.3; 5<R5/F<18;-5<R6/F<-2; 0.15<F/f3<0.3; 1.5<R7/F<3; -0.8<R8/F<-0.4;0.8<F/f4<1.2;-0.7<R9/F<-0.3;-1.6<R10/F<-0.8;-0.7<F/f5<-0.3;10< TTL/F<11; wherein R1 is the radius of curvature of the side of the first lens, R2 is the radius of curvature of the side of the first lens image, R3 is the radius of curvature of the side of the second lens, and R4 is the second lens image. The radius of curvature of the side surface, R7 is the radius of curvature of the side surface of the fourth lens object, R8 is the radius of curvature of the side surface of the fourth lens image, R9 is the radius of curvature of the side surface of the fifth lens object, and R10 is the side surface of the fifth lens image side. The radius of curvature, F is the system focal length value of the five-piece wide-angle lens. Thereby, the five-piece wide-angle lens has the effects of wide angle, corrected aberration, good image quality, and good temperature performance.

Please refer to FIG. 1 , which is a first embodiment of the present invention. The five-piece wide-angle lens (hereinafter referred to as a five-piece lens) sequentially includes an object from the object side A to the image side B on the optical axis L. a lens 10, a second lens 20, a third lens 30, a diaphragm ST, a fourth lens 40 and a fifth lens 50 are provided with CCD, CMOS or other photosensitive elements at the image side B (not shown) A flat lens 60 such as a filter and/or a cover glass may be disposed between the photosensitive element and the fifth lens 50. The number of the flat lenses 60 may be increased or decreased or not set as needed.

In this embodiment, the first lens 10 has a negative refractive power, the object side surface is a convex surface, and the image side surface is a concave surface, and the curvature radius of the object side surface and the image side surface are positive values, and the object side surface of the first lens 10 made of glass and The sides can be spherical. In this paper, when the surface center of a curved surface is closer to the image side than the surface itself, the curvature radius of the surface is positive; otherwise, when the surface center of a curved surface is closer to the object side than the surface itself, the surface is The radius of curvature is negative.

The second lens 20 has a negative refractive power, and the object side surface and the image side surface are both concave surfaces, and the radius of curvature of the object side surface is negative and smaller than the radius of curvature of the image side surface thereof, and the curvature radius of the image side surface is positive, made of plastic. Both the object side surface and the image side surface of the second lens 20 may be aspherical.

The third lens 30 has a positive refractive power, and the object side surface and the image side surface are convex surfaces, and the curvature radius of the object side surface is positive and larger than the curvature radius of the image side surface thereof, and the curvature radius of the image side surface is a negative value, and the plastic surface is made of plastic. Both the object side and the image side of the third lens 30 may be aspherical.

The fourth lens 40 has a positive refractive power, and the object side surface and the image side surface are both convex surfaces, and the curvature radius of the object side surface is positive and larger than the curvature radius of the image side surface thereof, and the curvature radius of the image side surface is negative, made of plastic. The object side surface and the image side surface of the fourth lens 40 may be aspherical.

The fifth lens 50 has a negative refractive power, and the object side surface is concave and the image side surface thereof is convex, and the curvature radius of the object side surface and the image side surface are both negative values, and the object side surface and the image side surface of the fifth lens 50 made of plastic can be It is aspherical. The fourth and fifth lenses 40, 50 are closely attached to each other to have the characteristics of a glued lens, thereby achieving the effect of correcting the chromatic aberration, and the second to fifth lenses are all plastic lenses, which can achieve a cost reduction effect.

The design parameters of the five-piece lens of this embodiment are as shown in Table 1 below:

Table I         <TABLE border="1" borderColor="#000000" width="_0001"><TBODY><tr><td> Lens</td><td> Face </td><td> Curvature Radius (mm) < /td><td> Distance (mm) </td><td> Refractive Index (Nd) </td><td> Dispersion Coefficient (Vd) </td></tr><tr><td> First Lens</td><td> object side 1 </td><td> 19 </td><td> 1.43 </td><td> 1.84 </td><td> 42.73 </td></tr ><tr><td> Image side 2 </td><td> 4.5 </td><td> 2.77 </td></tr><tr><td> Second lens</td><td> Side 3 </td><td> -9.287 </td><td> 1.24 </td><td> 1.53 </td><td> 56.07 </td></tr><tr><td> Image side 4 </td><td> 3.22 </td><td> 0.95 </td></tr><tr><td> third lens</td><td> object side 5 </td> <td> 9.72 </td><td> 1.66 </td><td> 1.64 </td><td> 23.53 </td></tr><tr><td> Image 6 </td>< Td> -6.4 </td><td> 1.6 </td></tr><tr><td> aperture</td><td> </td><td> ∞ </td><td> 0.4 </td><td> </td><td> </td></tr><tr><td> fourth lens</td><td> object side 8 </td><td> 2.95 < /td><td> 1.94 </td><td> 1.53 </td><td> 56.07 </td></tr><tr><td> Image side 9 </td><td> -0.885 < /td><td> 0.093 </td></tr><tr><td > Fifth lens</td><td> Object side 10 </td><td> -0.678 </td><td> 0.68 </td><td> 1.64 </td><td> 23.53 </td ></tr><tr><td> Image side 11 </td><td> -1.428 </td><td> 0.734 </td></tr><tr><td> Filter / Protection Glass</td><td> object side 12 </td><td> ∞ </td><td> 0.9 </td><td> </td><td> </td></tr>< Tr><td> image side 13 </td><td> ∞ </td><td> 1.6227 </td></tr></TBODY></TABLE>

In this embodiment, the object side surface and the image side surface of the second to fifth lenses 20, 30, 40, 50 are all aspherical surfaces, and the surface shape thereof satisfies the following aspherical formula:

Where c=1/r, r is the radius of curvature of the surface, h is the height of the light on the surface, k is the cone coefficient, B is the fourth-order coefficient, C is the sixth-order coefficient, and D is the eighth-order coefficient, E For the tenth order coefficient, F is the twelfth order coefficient, G is the fourteenth order coefficient, and H is the fifteenth order coefficient. The parameters of each aspheric surface of the first embodiment are as shown in Table 2 below:

Table II         <TABLE border="1" borderColor="#000000" width="_0003"><TBODY><tr><td> </td><td> Side 3 </td><td> Side 4 </ Td><td> object side 5 </td><td> image side 6 </td></tr><tr><td> k </td><td> -2.6 </td><td> - 0.28 </td><td> 4.77 </td><td> -4.04 </td></tr><tr><td> B </td><td> -3.632E-07 </td>< Td> -9.449E-04 </td><td> 4.006E-04 </td><td> 1.427E-03 </td></tr><tr><td> C </td><td > 7.923E-06 </td><td> -2.182E-05 </td><td> -7.458E-06 </td><td> -1.985E-05 </td></tr>< Tr><td> D </td><td> 6.096E-07 </td><td> -9.356E-06 </td><td> 2.353E-06 </td><td> -8.785E -06 </td></tr><tr><td> E </td><td> -4.526E-08 </td><td> -1.459E-06 </td><td> 1.709E -06 </td><td> -2.695E-06 </td></tr><tr><td> F </td><td> -5.603E-09 </td><td> -4.498 E-07 </td><td> 2.165E-07 </td><td> 9.983E-07 </td></tr><tr><td> G </td><td> 0 </ Td><td> 0 </td><td> 0 </td><td> 0 </td></tr><tr><td> H </td><td> 0 </td>< Td> 0 </td><td> 0 </td><td> 0 </td></tr><tr><td> </td><td> object side 8 </td><td> Image side 9 </td><td> object side 10 </td><td> image side 11 </td></tr><tr><td> k </td><td> 0.76 </td><td> -3.3 </td><td> -2.24 </td><td> - 3.86 </td></tr><tr><td> B </td><td> -1.494E-02 </td><td> -1.003E-01 </td><td> -6.679E -02 </td><td> -2.051E-02 </td></tr><tr><td> C </td><td> 3.889E-02 </td><td> 6.332E- 02 </td><td> 8.067E-02 </td><td> 2.942E-02 </td></tr><tr><td> D </td><td> -9.954E-02 </td><td> -4.074E-02 </td><td> -3.142E-02 </td><td> 2.964E-03 </td></tr><tr><td> E </td><td> 8.179E-02 </td><td> 1.365E-02 </td><td> 8.461E-04 </td><td> -6.308E-03 </td>< /tr><tr><td> F </td><td> -3.147E-02 </td><td> -2.465E-03 </td><td> 1.809E-03 </td>< Td> 1.541E-03 </td></tr><tr><td> G </td><td> 0 </td><td> 0 </td><td> 0 </td>< Td> 0 </td></tr><tr><td> H </td><td> 0 </td><td> 0 </td><td> 0 </td><td> 0 </td></tr></TBODY></TABLE>

Based on the foregoing design, the system focal length value F of the present embodiment is 1.455 mm, the system length is 16.020 mm, the first lens focal length value is -7.349 mm, the second lens focal length value is -4.298 mm, and the third lens focal length value is 6.214 mm. The fourth lens has a focal length of 1.538 mm, the fifth lens has a focal length of -3.098 mm, and the maximum viewing angle is 180 ∘.

At this time, the values of the relationship of the five-piece lens are as shown in Table 3 below:

Table 3         <TABLE border="1" borderColor="#000000" width="_0004"><TBODY><tr><td> Relationship </td><td> Value </td><td> Relationship </td ><td> Value </td></tr><tr><td> (f1×f2/f3)/(f4/f5) </td><td> -10.239 </td><td> R5/ F </td><td> 6.680 </td></tr><tr><td> (f4+f5) ×d45 </td><td> -0.145 </td><td> R6/F < /td><td> -4.399 </td></tr><tr><td> ∣f4/f5∣ </td><td> 0.496 </td><td> R7/F </td>< Td> 2.027 </td></tr><tr><td> T15/TTL </td><td> 0.797 </td><td> R8/F </td><td> -0.608 </td ></tr><tr><td> (f2+f3)/d23 </td><td> 2.017 </td><td> R9/F </td><td> -0.466 </td>< /tr><tr><td> (R5×R6)/f3 </td><td> -10.011 </td><td> R10/F </td><td> -0.981 </td></ Tr><tr><td> (f2+f3)/(f4+f5) </td><td> -1.228 </td><td> F/F1 </td><td> -0.198 </td ></tr><tr><td> TTL/F </td><td> 11.010 </td><td> F/F2 </td><td> -0.339 </td></tr>< Tr><td> R1/F </td><td> 13.058 </td><td> F/F3 </td><td> 0.234 </td></tr><tr><td> R2/ F </td><td> 3.093 </td><td> F/F4 </td><td> 0.946 </td></tr><tr><td> R3/F </td><td > -6.383 </td><td> F/F5 </td><td> -0.470 </td></t r><tr><td> R4/F </td><td> 2.213 </td><td> </td><td> </td></tr></TBODY></TABLE>

In this way, the five-piece lens has wide-angle, correctable aberration, high image quality, and good temperature performance. The distortion map is shown in Figure 1A, and the maximum distortion is no more than -100%. As shown in Figure 1B, the lateral chromatic aberration diagram shows good chromatic aberration performance at different image heights.

Please refer to FIG. 2 , which is a second embodiment of the present invention. The lens configuration is similar to that of the first embodiment. The design parameters of the five-piece lens of this embodiment are as shown in Table 4 below:

Table 4         <TABLE border="1" borderColor="#000000" width="_0005"><TBODY><tr><td> Lens</td><td> Face </td><td> Curvature Radius (mm) < /td><td> Distance (mm) </td><td> Refractive Index (Nd) </td><td> Dispersion Coefficient (Vd) </td></tr><tr><td> First Lens </td><td> object side 1 </td><td> 19 </td><td> 1.34 </td><td> 1.77 </td><td> 49.60 </td></tr ><tr><td> Image side 2 </td><td> 5 </td><td> 2.84 </td></tr><tr><td> Second lens</td><td> Side 3 </td><td> -23.26 </td><td> 1.57 </td><td> 1.53 </td><td> 56.04 </td></tr><tr><td> Image side 4 </td><td> 2.38 </td><td> 0.86 </td></tr><tr><td> third lens</td><td> object side 5 </td> <td> 14.14 </td><td> 3.07 </td><td> 1.64 </td><td> 23.53 </td></tr><tr><td> Image side 6 </td>< Td> -5.54 </td><td> 1.381 </td></tr><tr><td> aperture</td><td> </td><td> ∞ </td><td> 0.577 </td><td> </td><td> </td></tr><tr><td> fourth lens</td><td> object side 8 </td><td> 3.27 < /td><td> 2.234 </td><td> 1.53 </td><td> 56.07 </td></tr><tr><td> Image side 9 </td><td> -0.805 < /td><td> 0.0228 </td></tr>< Tr><td> fifth lens</td><td> object side 10 </td><td> -0.804 </td><td> 0.615 </td><td> 1.64 </td><td> 23.53 </td></tr><tr><td> Image side 11 </td><td> -2.187 </td><td> 0.84 </td></tr><tr><td> Filter Light sheet / protective glass</td><td> object side 12 </td><td> ∞ </td><td> 0.9 </td><td> </td><td> </td>< /tr><tr><td> Like Side 13 </td><td> ∞ </td><td> 1.5784 </td></tr></TBODY></TABLE>

In this embodiment, the object side surface and the image side surface of the second to fifth lenses 20, 30, 40, and 50 are aspherical surfaces, and the surface shape thereof satisfies the above aspherical surface formula, and the parameters of the aspheric surfaces of the second embodiment are as follows Table 5 shows:

Table 5         <TABLE border="1" borderColor="#000000" width="_0006"><TBODY><tr><td> </td><td> object side 3 </td><td> image side 4 </ Td><td> object side 5 </td><td> image side 6 </td></tr><tr><td> k </td><td> 2.2 </td><td> -1.09 </td><td> -33.9 </td><td> -3.9 </td></tr><tr><td> B </td><td> -3.686E-04 </td>< Td> -3.458E-03 </td><td> 5.874E-04 </td><td> 2.241E-03 </td></tr><tr><td> C </td><td > -1.839E-05 </td><td> -9.706E-04 </td><td> 7.359E-04 </td><td> 9.777E-04 </td></tr><tr ><td> D </td><td> 3.018E-06 </td><td> 3.477E-05 </td><td> 4.850E-05 </td><td> 1.741E-04 < /td></tr><tr><td> E </td><td> 4.179E-07 </td><td> 1.362E-05 </td><td> -2.480E-06 </ Td><td> -3.279E-05 </td></tr><tr><td> F </td><td> -3.080E-08 </td><td> -1.326E-06 < /td><td> 5.837E-07 </td><td> 9.206E-06 </td></tr><tr><td> G </td><td> 0 </td><td > 0 </td><td> 0 </td><td> 0 </td></tr><tr><td> H </td><td> 0 </td><td> 0 < /td><td> 0 </td><td> 0 </td></tr><tr><td> </td><td> object side 8 </td><td> image side 9 < /td><td> Object side 10 </td><td> Image side 11 </ Td></tr><tr><td> k </td><td> 0.914 </td><td> -2.96 </td><td> -2.64 </td><td> -7.73 </ Td></tr><tr><td> B </td><td> -1.360E-02 </td><td> -9.245E-02 </td><td> -7.131E-02 < /td><td> -2.686E-02 </td></tr><tr><td> C </td><td> 5.046E-02 </td><td> 6.769E-02 </ Td><td> 7.702E-02 </td><td> 3.201E-02 </td></tr><tr><td> D </td><td> -1.109E-01 </td ><td> -4.517E-02 </td><td> -2.691E-02 </td><td> 5.059E-03 </td></tr><tr><td> E </td ><td> 8.937E-02 </td><td> 1.408E-02 </td><td> 3.199E-03 </td><td> -6.749E-03 </td></tr> <tr><td> F </td><td> -3.477E-02 </td><td> -2.515E-03 </td><td> 9.332E-04 </td><td> 2.215 E-03 </td></tr><tr><td> G </td><td> 0 </td><td> 0 </td><td> 0 </td><td> 0 </td></tr><tr><td> H </td><td> 0 </td><td> 0 </td><td> 0 </td><td> 0 </td ></tr></TBODY></TABLE>

Based on the foregoing design, the system focal length value F of the present embodiment is 1.406 mm, the system length is 17.828 mm, the first lens focal length value is -9.11 mm, the second lens focal length value is -3.775 mm, and the third lens focal length value is 6.552 mm. The fourth lens has a focal length of 1.486 mm, the fifth lens has a focal length of -2.380 mm, and the maximum viewing angle is 180 ∘.

At this time, the values of the relationship of the five-piece lens are as shown in Table 6 below:

Table 6         <TABLE border="1" borderColor="#000000" width="_0007"><TBODY><tr><td> Relationship </td><td> Value </td><td> Relationship </td ><td> Value</td></tr><tr><td> (f1×f2/f3)/(f4/f5) </td><td> -8.819 </td><td> R5/ F </td><td> 10.057 </td></tr><tr><td> (f4+f5) ×d45 </td><td> -0.020 </td><td> R6/F < /td><td> -3.940 </td></tr><tr><td> ∣f4/f5∣ </td><td> 0.624 </td><td> R7/F </td>< Td> 2.326 </td></tr><tr><td> T15/TTL </td><td> 0.814 </td><td> R8/F </td><td> -0.573 </td ></tr><tr><td> (f2+f3)/d23 </td><td> 3.017 </td><td> R9/F </td><td> -0.572 </td>< /tr><tr><td> (R5×R6)/f3 </td><td> -11.956 </td><td> R10/F </td><td> -1.555 </td></ Tr><tr><td> (f2+f3)/(f4+f5) </td><td> -2.903 </td><td> F/F1 </td><td> -0.154 </td ></tr><tr><td> TTL/F </td><td> 12.680 </td><td> F/F2 </td><td> -0.355 </td></tr>< Tr><td> R1/F </td><td> 13.514 </td><td> F/F3 </td><td> 0.215 </td></tr><tr><td> R2/ F </td><td> 3.556 </td><td> F/F4 </td><td> 0.946 </td></tr><tr><td> R3/F </td><td > -16.543 </td><td> F/F5 </td><td> -0.591 </td></ Tr><tr><td> R4/F </td><td> 1.693 </td><td> </td><td> </td></tr></TBODY></TABLE>

As a result, the five-piece lens has wide-angle, correctable aberration, high image quality, and good temperature performance. The distortion map is shown in Figure 2A. The maximum distortion does not exceed -100%. As shown in Figure 2B, the lateral chromatic aberration diagram shows good chromatic aberration performance at different image heights.

Please refer to FIG. 3 , which is a third embodiment of the present invention. The lens configuration is similar to that of the first embodiment. The design parameters of the five-piece lens of this embodiment are as shown in Table 7 below:

Table 7         <TABLE border="1" borderColor="#000000" width="_0008"><TBODY><tr><td> Lens</td><td> Face</td><td> Curvature Radius (mm) < /td><td> Distance (mm) </td><td> Refractive Index (Nd) </td><td> Dispersion Coefficient (Vd) </td></tr><tr><td> First Lens </td><td> object side 1 </td><td> 19 </td><td> 1.7 </td><td> 1.77 </td><td> 49.60 </td></tr ><tr><td> Image side 2 </td><td> 4.3 </td><td> 3 </td></tr><tr><td> Second lens</td><td> Side 3 </td><td> -8.8 </td><td> 1.535 </td><td> 1.53 </td><td> 56.04 </td></tr><tr><td> Image side 4 </td><td> 2.96 </td><td> 0.5 </td></tr><tr><td> third lens</td><td> object side 5 </td> <td> 24.46 </td><td> 1.78 </td><td> 1.64 </td><td> 23.53 </td></tr><tr><td> Like Side 6 </td>< Td> -4.51 </td><td> 1.55 </td></tr><tr><td> aperture</td><td> </td><td> ∞ </td><td> 0.55 </td><td> </td><td> </td></tr><tr><td> fourth lens</td><td> object side 8 </td><td> 3.07 < /td><td> 2.06 </td><td> 1.53 </td><td> 56.04 </td></tr><tr><td> Image side 9 </td><td> -0.805 < /td><td> 0.0228 </td></tr><tr><td> Fifth lens </td><td> object side 10 </td><td> -0.804 </td><td> 0.75 </td><td> 1.64 </td><td> 23.53 </td> </tr><tr><td> image side 11 </td><td> -2.1 </td><td> 0.86 </td></tr><tr><td> filter / protective glass </td><td> object side 12 </td><td> ∞ </td><td> 0.9 </td><td> </td><td> </td></tr><tr ><td> Image side 13 </td><td> ∞ </td><td> 1.6291 </td></tr></TBODY></TABLE>

In this embodiment, the object side surface and the image side surface of the second to fifth lenses 20, 30, 40, 50 are all aspherical surfaces, and the surface shape thereof satisfies the above aspherical surface formula, and the parameters of the aspheric surfaces of the third embodiment are as follows Table 8 shows:

Table eight         <TABLE border="1" borderColor="#000000" width="_0009"><TBODY><tr><td> </td><td> object side 3 </td><td> image side 4 </ Td><td> object side 5 </td><td> image side 6 </td></tr><tr><td> k </td><td> 0.70 </td><td> -0.94 </td><td> 53.40 </td><td> -4.20 </td></tr><tr><td> B </td><td> -4.502E-04 </td><td > -4.741E-03 </td><td> -2.782E-04 </td><td> 1.394E-03 </td></tr><tr><td> C </td><td > -6.330E-05 </td><td> -1.079E-03 </td><td> 7.686E-04 </td><td> 8.132E-04 </td></tr><tr ><td> D </td><td> 3.311E-06 </td><td> 7.378E-05 </td><td> 1.710E-05 </td><td> 1.451E-04 < /td></tr><tr><td> E </td><td> 8.526E-07 </td><td> 1.530E-05 </td><td> -6.471E-06 </ Td><td> -4.254E-05 </td></tr><tr><td> F </td><td> -5.020E-08 </td><td> -1.898E-06 < /td><td> 6.751E-07 </td><td> 7.626E-06 </td></tr><tr><td> G </td><td> 0 </td><td > 0 </td><td> 0 </td><td> 0 </td></tr><tr><td> H </td><td> 0 </td><td> 0 < /td><td> 0 </td><td> 0 </td></tr><tr><td> </td><td> object side 8 </td><td> image side 9 < /td><td> object side 10 </td><td> image side 11 </td></tr><tr><td> k </td><td> 1.26 </td><td> -3.00 </td><td> -2.73 </td><td> -8.00 </td></tr><tr><td> B </td><td> -1.192E-02 </td><td> -8.998E-02 </td><td> -8.838E- 02 </td><td> -4.355E-02 </td></tr><tr><td> C </td><td> 5.084E-02 </td><td> 7.104E-02 </td><td> 7.286E-02 </td><td> 2.592E-02 </td></tr><tr><td> D </td><td> -1.089E-01 < /td><td> -4.572E-02 </td><td> -2.665E-02 </td><td> 5.817E-03 </td></tr><tr><td> E < /td><td> 9.296E-02 </td><td> 1.478E-02 </td><td> 2.244E-03 </td><td> -5.865E-03 </td></ Tr><tr><td> F </td><td> -3.166E-02 </td><td> -2.288E-03 </td><td> 1.104E-03 </td><td > 1.424E-03 </td></tr><tr><td> G </td><td> 0 </td><td> 0 </td><td> 0 </td><td > 0 </td></tr><tr><td> H </td><td> 0 </td><td> 0 </td><td> 0 </td><td> 0 < /td></tr></TBODY></TABLE>

Based on the foregoing design, the system focal length value F of the present embodiment is 1.444 mm, the system length is 16.837 mm, the first lens focal length value is -7.536 mm, the second lens focal length value is -3.696 mm, and the third lens focal length value is 6.029 mm. The fourth lens has a focal length of 1.465 mm, the fifth lens has a focal length of -2.605 mm, and the maximum viewing angle is 180 ∘.

At this time, the values of the relationship of the five-piece lens are as shown in Table 9 below:

Table 9         <TABLE border="1" borderColor="#000000" width="_0010"><TBODY><tr><td> Relationship </td><td> Value </td><td> Relationship </td ><td> Value</td></tr><tr><td> (f1×f2/f3)/(f4/f5) </td><td> -8.815 </td><td> R5/ F </td><td> 16.939 </td></tr><tr><td> (f4+f5) ×d45 </td><td> -0.026 </td><td> R6/F < /td><td> -3.123 </td></tr><tr><td> ∣f4/f5∣ </td><td> 0.562 </td><td> R7/F </td>< Td> 2.126 </td></tr><tr><td> T15/TTL </td><td> 0.799 </td><td> R8/F </td><td> 2.126 </td> </tr><tr><td> (f2+f3)/d23 </td><td> 4.126 </td><td> R9/F </td><td> -0.557 </td></ Tr><tr><td> (R5×R6)/f3 </td><td> -18.297 </td><td> R10/F </td><td> -0.557 </td></tr ><tr><td> (f2+f3)/(f4+f5) </td><td> -1.810 </td><td> F/F1 </td><td> -0.192 </td> </tr><tr><td> TTL/F </td><td> 11.660 </td><td> F/F2 </td><td> -0.364 </td></tr><tr ><td> R1/F </td><td> 13.158 </td><td> F/F3 </td><td> 0.240 </td></tr><tr><td> R2/F </td><td> 2.978 </td><td> F/F4 </td><td> 0.986 </td></tr><tr><td> R3/F </td><td> -6.094 </td><td> F/F5 </td><td> -0.554 </td></tr ><tr><td> R4/F </td><td> 2.050 </td><td> </td><td> </td></tr></TBODY></TABLE>

In this way, the five-piece lens has wide-angle, correctable aberration, high image quality and good temperature performance. The distortion map is shown in Figure 3A. The maximum distortion is no more than -100%. As shown in Figure 3B, the lateral chromatic aberration diagram shows good chromatic aberration performance at different image heights.

10‧‧‧ first lens
20‧‧‧second lens
30‧‧‧ third lens
40‧‧‧Fourth lens
50‧‧‧ fifth lens
60‧‧‧ flat lenses
A‧‧‧ object side
B‧‧‧ image side
ST‧‧‧ aperture
L‧‧‧ optical axis

Figure 1 is a schematic view of the first embodiment of the creation.

Fig. 1A is a distortion diagram of the first embodiment of the creation.

Fig. 1B is a lateral chromatic aberration diagram of the first embodiment at different image heights.

Fig. 2 is a schematic view showing a second embodiment of the creation.

Fig. 2A is a distortion diagram of the second embodiment of the creation.

Fig. 2B is a lateral chromatic aberration diagram of the second embodiment of the present invention at different image heights.

Figure 3 is a schematic view of a third embodiment of the creation.

Fig. 3A is a distortion diagram of the third embodiment of the creation.

Fig. 3B is a lateral chromatic aberration diagram of the third embodiment of the present invention at different image heights.

10‧‧‧ first lens

20‧‧‧second lens

30‧‧‧ third lens

40‧‧‧Fourth lens

50‧‧‧ fifth lens

60‧‧‧ flat lenses

A‧‧‧ object side

B‧‧‧ image side

ST‧‧‧ aperture

L‧‧‧ optical axis

Claims (16)

A five-piece wide-angle lens includes, in order from the object side to the image side, a first lens having a negative refractive power, a convex side of the object surface and a concave side like the side surface, and a second lens having a negative refractive power and a side surface and an image thereof The third lens has a positive refractive power, and the object side surface and the image side surface are convex surfaces; an aperture; a fourth lens having a positive refractive power, the object side surface and the image side surface are convex surfaces; and a fifth The lens has a negative refractive power, the object side is concave and the image side is convex; wherein the five-piece wide-angle lens more satisfies the following relationship: -12<(f1×f2/f3)/(f4/f5)<-6; Where f1 is the focal length value of the first lens, f2 is the focal length value of the second lens, f3 is the focal length value of the third lens, f4 is the focal length value of the fourth lens, and f5 is the focal length value of the fifth lens . A five-piece wide-angle lens includes, in order from the object side to the image side, a first lens having a negative refractive power, a radius of curvature of the object side surface being a positive value, and a curvature radius of the image side surface being a positive value; Having a negative refractive power, the radius of curvature of the side of the object is a negative value, and the radius of curvature of the side of the object is smaller than the radius of curvature of the side of the image side; a third lens having a positive refractive power, the radius of curvature of the image side is negative, and The radius of curvature of the side of the object is larger than the radius of curvature of the side of the image; an aperture; a fourth lens having a positive refractive power, the radius of curvature of the side of the object is positive, and the radius of curvature of the side of the object is larger than the radius of curvature of the side of the image And a fifth lens having a negative refractive power, a radius of curvature of the object side surface is a negative value, and a radius of curvature of the image side surface thereof is a negative value; wherein the five-piece wide-angle lens more satisfies the following relationship: -12<(f1 ×f2/f3)/(f4/f5)<-6; wherein f1 is the focal length value of the first lens, f2 is the focal length value of the second lens, f3 is the focal length value of the third lens, and f4 is the first The focal length of the four lenses, F5 is the focal length value of the fifth lens. The five-piece wide-angle lens of claim 2, wherein a radius of curvature of the side of the second lens image is a positive value. The five-piece wide-angle lens of claim 2, wherein a radius of curvature of a side of the third lens object is a positive value. The five-piece wide-angle lens of claim 2, wherein a radius of curvature of the side of the fourth lens image is a negative value. The five-piece wide-angle lens according to any one of claims 1 to 5, further satisfying the following relationship: -1< (f4+f5) × d45<0; wherein d45 is between the fourth and fifth lenses The spacing on the optical axis. The five-piece wide-angle lens according to any one of claims 1 to 5, which satisfies the following relationship: 0.4 < ∣f4 / f5 ∣ < 2. The five-piece wide-angle lens according to any one of claims 1 to 5, further satisfying the following relationship: 0.70 < T15 / TTL < 1; wherein T15 is between the side of the first lens object and the side of the fifth lens image The pitch on the optical axis, TTL is the total length of the system of the five-chip wide-angle lens. The five-piece wide-angle lens according to any one of claims 1 to 5, further satisfying the following relationship: 1.8 < (f2 + f3) / d23 < 4.5; wherein d23 is between the second and third lenses The spacing on the optical axis. The five-piece wide-angle lens according to any one of claims 1 to 5, further satisfying the following relationship: -20 < (R5 × R6) / f3 < - 10; wherein R5 is the radius of curvature of the side of the third lens R6 is the radius of curvature of the side of the third lens image. The five-piece wide-angle lens according to any one of claims 1 to 5, which satisfies the following relationship: -4 < (f2 + f3) / (f4 + f5) < -1. The five-piece wide-angle lens according to any one of claims 1 to 5, further satisfying the following relationship: 10<R1/F<15; 1<R2/F<5; -0.2<F/f1<-0.1; Where R1 is the radius of curvature of the side of the first lens object, R2 is the radius of curvature of the side of the first lens image, and F is the system focal length value of the five-piece wide-angle lens. The five-piece wide-angle lens according to any one of claims 1 to 5, which satisfies the following relationship: -18<R3/F<-5; 1<R4/F<3; -0.4<F/f2<- 0.3; wherein R3 is the radius of curvature of the side of the second lens object, R4 is the radius of curvature of the side of the second lens image, and F is the system focal length value of the five-piece wide-angle lens. The five-piece wide-angle lens according to any one of claims 1 to 5, further satisfying the following relationship: 5<R5/F<18; -5<R6/F<-2; 0.15<F/f3<0.3; Wherein R5 is the radius of curvature of the side surface of the third lens object, R6 is the radius of curvature of the side surface of the third lens image, and F is the system focal length value of the five-piece wide-angle lens. The five-piece wide-angle lens according to any one of claims 1 to 5, which satisfies the following relationship: 1.5<R7/F<3; -0.8<R8/F<-0.4; 0.8<F/f4<1.2; Where R7 is the radius of curvature of the side of the fourth lens object, R8 is the radius of curvature of the side of the fourth lens image, and F is the system focal length value of the five-piece wide-angle lens. The five-piece wide-angle lens according to any one of claims 1 to 5, which satisfies the following relationship: -0.7<R9/F<-0.3; -1.6<R10/F<-0.8; -0.7<F/f5 <-0.3; wherein R9 is the radius of curvature of the side surface of the fifth lens, R10 is the radius of curvature of the side of the fifth lens image, and F is the system focal length value of the five-piece wide-angle lens.