TWM495520U - Mini wide angle lens - Google Patents

Abstract

The present invention discloses a mini wide angle lens. The mini wide angle lens includes, in order from an object side to an image side, a first lens with negative refractive power, a second lens with positive refractive power, a stop, a third lens with positive refractive power, a forth lens with positive refractive power, and a fifth lens with negative refractive power. The mini wide angle lens satisfies at least one of the following formulas: (1) 0 < V1 - V2 < 20 (2) 1.78 < I5 < 2.2 , and 16 < V5 < 35 (3) 0.75 < I3 / I1 < 0.95, 1.05 < I5 / I1 < 1.25, 15 < V3 - V1 < 40, and 20 < V1 - V5 < 45, and (4) 1.65 < I2 < 2.2, 35 < V2 < 70, V4 - V5 > 20, and I5 - I4 < 0.4, wherein V1 is a ABBE number of the first lens, V2 is a ABBE number of the second lens, V3 is a ABBE number of the third lens, V4 is a ABBE number of the forth lens, V5 is a ABBE number of the fifth lens, I1 is a refraction index of the first lens, I2 is a refraction index of the second lens, I3 is a refraction index of the third lens, I4 is a refraction index of the forth lens, and I5 is a refraction index of the fifth lens.

Description

Mini wide-angle lens

This creation is about a wide-angle lens, especially about a miniaturized wide-angle lens.

In recent years, electronic devices have developed toward light, thin, and short design trends to meet the needs of humanity. Therefore, lens modules must also be applied to mobile devices, vehicle devices, sports devices, and security monitoring devices with miniaturization. In the field of products, in the process of miniaturization of the lens module, people also hope that the lens has a high field of view (FOV) to capture a wider field of view.

However, when the angle of view of the lens is greater than 90 degrees, it is easy to cause distortion and distortion of the image. In order to overcome aberrations such as distortion or distortion, the lens must be compensated by more lenses, which increases the thickness of the lens. The need for miniaturization is contrary. Therefore, how to balance the needs of miniaturization and field of view, and even have high image quality at the same time has become an issue that people in this field are currently studying. Related research is shown in Taiwan Patent No. I416197, but it only discloses the relationship between the plurality of focal lengths of a plurality of lenses in the lens, and there is no material and a plurality of opticals related to the material of the plurality of lenses. Parameters such as Abbe number, refractive index, etc., have been studied and studied.

In addition, the conventional miniaturized lens is due to its back focus (the last one of the lens) The distance from the lens to the focal plane is too short, so the lens module must be assembled in a COB (Chip On Board) package, but the COB package will increase the manufacturing cost; in the past, the miniaturized lens is due to its internal Most of the lenses are made of plastic material, so the luminosity is much lost, resulting in a darker image.

According to the above description, the conventional miniaturized lens has an improved space.

The purpose of this creation is to provide a miniaturized wide-angle lens that combines the focal lengths of the lenses and the optical parameters of the lenses to provide a small volume, wide field of view, and high image quality. And the advantage of low manufacturing costs.

In a preferred embodiment, the present invention provides a miniature wide-angle lens including, in order from its object end to the image end, a first lens having a negative refractive power and a second lens having a positive refractive power; a third lens having a positive refractive power; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power, the miniature wide-angle lens satisfying at least one of the following conditions (1) to (4): (1) 0 < V1 - V2 < 20; (2) 1.78 < I5 < 2.2, 16 < V5 < 35, and the object side surface and the image side surface of the fifth lens are concave and convex, respectively; (3) 0.75 < I3/I1<0.95, 1.05<I5/I1<1.25, 15<V3-V1<40, and 20<V1-V5<45; and (4)1.65<I2<2.2,35<V2<70,V4-V5 >20, and I5-I4<0.4; wherein V1 is the Abbe number (ABBE) of the first lens, and V2 is the second lens The Abbe number, V3 is the Abbe number of the third lens, V4 is the Abbe number of the fourth lens, V5 is the Abbe number of the second lens, I1 is the refractive index of the first lens, and I2 is The refractive index of the second lens, I3 is the refractive index of the third lens, I4 is the refractive index of the fourth lens, and I5 is the refractive index of the fifth lens.

In a preferred embodiment, the miniature wide-angle lens further satisfies the following conditional formula: -3.2<f/f1<-0.78; wherein f is the focal length of the overall miniature wide-angle lens, and f1 is the focal length of the first lens.

In a preferred embodiment, the miniature wide-angle lens further satisfies the following conditional formula: 1<f/f4<2; wherein f is the focal length of the overall miniature wide-angle lens, and f4 is the focal length of the fourth lens.

In a preferred embodiment, the miniature wide-angle lens further satisfies the following conditional formula: f1/f2<0; wherein f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

In a preferred embodiment, the miniature wide-angle lens further includes an electronic photosensitive element for imaging a subject thereon, and the miniature wide-angle lens further satisfies the following condition: 1<ImgH/f<2; ImgH is half the diagonal length of the effective pixel area of the electronic photosensitive element, and f is the focal length of the overall miniature wide-angle lens.

In a preferred embodiment, the miniature wide-angle lens further includes an electronic photosensitive element for imaging a subject thereon, and the miniature wide-angle lens further satisfies the following condition: TTL/Imgh<3; wherein TTL is The distance from the object side surface of the first lens to the optical axis of the electronic photosensitive element, ImgH is half the diagonal length of the effective pixel area of the electronic photosensitive element.

In a preferred embodiment, the miniature wide-angle lens further includes an aperture disposed between the second lens and the third lens.

In a preferred embodiment, the micro wide-angle lens further includes an infrared filter disposed between the fifth lens and an imaging surface for filtering the plurality of noise lights.

In a preferred embodiment, the miniature wide-angle lens is assembled through a PLCC (Plastic Leaded Chip Carrier) package.

In a preferred embodiment, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are made of a glass material.

1‧‧‧ miniature wide-angle lens

10‧‧‧ imaging surface

11‧‧‧First lens

12‧‧‧second lens

13‧‧‧ third lens

14‧‧‧Fourth lens

15‧‧‧ fifth lens

16‧‧‧ aperture

17‧‧‧Infrared filter

18‧‧‧Electronic photosensitive element

19‧‧‧ optical axis

S1‧‧‧ object side surface of the first lens

S2‧‧‧ Image side surface of the first lens

S3‧‧‧ object side surface of the second lens

Image side surface of S4‧‧‧ second lens

S5‧‧‧ object side surface of the third lens

S6‧‧‧ image side surface of the third lens

S7‧‧‧ object side surface of the fourth lens

S8‧‧‧ image side surface of the fourth lens

S9‧‧‧ object side surface of the fifth lens

S10‧‧‧ Image side surface of the fifth lens

Surface of S11‧‧‧ Infrared Filter

Surface of S12‧‧‧ Infrared Filter

f‧‧‧Focus of the overall miniature wide-angle lens

F1‧‧‧The focal length of the first lens

F2‧‧‧The focal length of the second lens

F4‧‧‧The focal length of the fourth lens

I1‧‧‧ refractive index of the first lens

I2‧‧‧ refractive index of the second lens

I3‧‧‧ refractive index of the third lens

I4‧‧‧ refractive index of the fourth lens

I5‧‧‧ refractive index of the fifth lens

V1‧‧‧Abbe number of the first lens

Abbe number of V2‧‧‧ second lens

Abbe number of V3‧‧‧ third lens

Abbe number of V4‧‧‧ fourth lens

Abbe number of V5‧‧‧ fifth lens

T‧‧‧ tangential component

S‧‧‧radial component

Half of the diagonal length of the effective pixel area of the ImgH‧‧‧ electronic sensor

TTL‧‧‧The distance from the object side surface of the first lens to the optical axis on the optical axis

Figure 1: This is the result of creating a miniature wide-angle lens in a preferred embodiment. Schematic diagram.

Figure 2: is a modulation transfer function (MTF) plot obtained from an optical data sheet.

Please refer to FIG. 1 , which is a structural diagram of a preferred embodiment of a miniature wide-angle lens. The micro wide-angle lens 1 includes, in order from its object end (subject end) to the image end (imaging end) in the direction of its optical axis 19, a first lens 11, a second lens 12, a diaphragm 16, a third lens 13, and a fourth lens 14 in this order, and The fifth lens 15. When the miniature wide-angle lens 1 takes an image of a subject (not shown), the light is projected through the first lens 11, the second lens 12, the aperture 16, the third lens 13, the fourth lens 14, and the fifth lens 15 On an imaging surface 10. In the preferred embodiment, the miniature wide-angle lens 1 further includes an electronic photosensitive element 18 and an infrared filter 17 disposed on the imaging surface 10 for imaging the object thereon. The infrared filter 17 is disposed between the fifth lens 15 and the imaging surface 10 to filter out unnecessary noise light, thereby improving optical performance.

Furthermore, the first lens 11 has a negative refractive power, which is a crescent lens in which the object side surface S1 is convex and the image side surface S2 is concave, for increasing the angle of view of the micro wide-angle lens 1; Having a positive refractive power, which is a lens whose object side surface S3 is concave and the image side surface S4 is convex, to correct the aberration generated by the light passing through the first lens 11, and to converge the light to the aperture 16, the aperture 16 further adjusting the symmetry and balance of the aberration of the received light; in addition, the third lens 13 has a positive a refractive power, which is a lens in which the object side surface S5 is a flat surface and the image side surface S6 is a convex surface, for condensing and transmitting the light passing through the aperture 16 to the fourth lens 14; further, the fourth lens 14 has a positive refractive power, It is a lens in which both the object side surface S7 and the image side surface S8 are convex to converge and transmit the light passing through the third lens 13 to the fifth lens 15; further, the fifth lens 15 has a negative refractive power, which is The side surface S9 is a concave surface lens having a concave surface and the side surface surface S10 is convex to correct the aberration generated by the light passing through the fourth lens 14 and to adjust the light to the electron photosensitive element 18.

Furthermore, the miniature wide-angle lens 1 satisfies the following focal length condition: -3.2<f/f1<-0.78, where f is the focal length of the overall miniature wide-angle lens 1, and f1 is the focal length of the first lens 11, and according to experience, it is designed such that Increasing the angle of view of the micro wide-angle lens 1 and making the first lens 11 easy to manufacture; in addition, the miniature wide-angle lens 1 also satisfies the following focal length condition: 1 < f / f 4 < 2, where f4 is the focal length of the fourth lens 14 According to experience, the design can balance the total aberration of the micro wide-angle lens 1 and make the fourth lens 14 easy to manufacture; in addition, the miniature wide-angle lens 1 also satisfies the following focal length conditions: 1 < ImgH / f < 1.5, where ImgH It is half the diagonal length of the effective pixel area of the electronic photosensitive element 18, and according to the result of the software simulation, the design can increase the angle of view of the miniature wide-angle lens 1; in addition, the miniature wide-angle lens 1 also satisfies the following focal length condition: TTL /Imgh<3, where TTL is the distance from the object side surface S1 of the first lens 11 to the optical photosensitive element 18 on the optical axis 19, and according to the result of the software simulation, the size of the miniature wide-angle lens 1 is reduced in this way; Micro wide-angle lens The head 1 also satisfies the following focal length condition: f1/f2<0, where f2 is the focal length of the second lens 12, and the purpose of the design is to make the focal length of the first lens 11 opposite to the focal length of the second lens, according to The result of the software simulation, whereby the total aberration of the miniature wide-angle lens 1 can be reduced.

Furthermore, the miniature wide-angle lens 1 satisfies the following condition: 0 < V1 - V2 < 20, where V1 is the Abbe number (ABBE) of the first lens 11, and V2 is the Abbe number of the second lens 12, and is based on the software. The result of the simulation is designed to reduce the total chromatic aberration of the miniature wide-angle lens 1; in addition, the miniature wide-angle lens 1 satisfies the following condition: 1.78 < I 5 < 2.2, where I5 is the refractive index of the fifth lens 15, and is based on the software The result of the simulation is such that, in the case where the volume of the micro wide-angle lens 1 is very small, the total aberration of the micro wide-angle lens 1 can be reduced, and the micro wide-angle lens 1 can maintain good focusing ability; in addition, the miniature wide-angle lens 1 also satisfies the following Condition: 16<V5<35, where V5 is the Abbe number of the fifth lens 15, and according to the result of the software simulation, the design can reduce the size of the micro wide-angle lens 1 in the case where the volume of the micro wide-angle lens 1 is very small. Total chromatic aberration.

Furthermore, the miniature wide-angle lens 1 also satisfies the following condition: 0.75 < I3 / I1 < 0.95, where I1 is the refractive index of the first lens 11, and I3 is the refractive index of the third lens 13, and according to the result of the software simulation, The design can reduce the total aberration of the miniature wide-angle lens 1 and make the aberrations of the lenses in the miniature wide-angle lens 1 complementary; in addition, the miniature wide-angle lens 1 satisfies the following condition: 1.05<I5/I1<1.25, and according to the result of the software simulation, The design can reduce the total aberration of the miniature wide-angle lens 1 and make the aberrations of the lenses in the miniature wide-angle lens 1 complementary; in addition, the miniature wide-angle lens 1 satisfies the following condition: 15<V3-V1<40, wherein V1 is the first The Abbe number of the lens 11, V3 is the Abbe number of the third lens 13, and according to the result of the software simulation, the total chromatic aberration of the micro wide-angle lens 1 is designed to be reduced, and the chromatic aberration of each lens in the micro wide-angle lens 1 is made. Complementary; in addition, the miniature wide-angle lens 1 also satisfies the following condition: 20 < V1 - V5 < 45.

Furthermore, the miniature wide-angle lens 1 also satisfies the following condition: 1.65 < I2 < 2.2, where I2 is the refractive index of the second lens 12, and according to the result of the software simulation, the size of the miniature wide-angle lens 1 is so small. In addition, the total aberration of the miniature wide-angle lens 1 can be reduced, and the micro wide-angle lens 1 can maintain a good focusing ability; in addition, the miniature wide-angle lens 1 also satisfies the following condition: 35 < V2 < 70, wherein V2 is the second lens 12 Abbe number, and according to the result of the software simulation, the design can reduce the total chromatic aberration of the miniature wide-angle lens 1 in the case where the volume of the miniature wide-angle lens 1 is very small; in addition, the miniature wide-angle lens 1 satisfies the following condition: V4 -V5>20; wherein V4 is the Abbe number of the fourth lens 14, and V5 is the Abbe number of the fifth lens 15, and according to the result of the software simulation, the total chromatic aberration of the miniature wide-angle lens 1 is designed to be reduced, and The chromatic aberration of each lens in the miniature wide-angle lens 1 Further, the miniature wide-angle lens 1 also satisfies the following condition: I5 - I4 < 0.4, where I4 is the refractive index of the fourth lens 14, and I5 is the refractive index of the fifth lens 15, and is designed according to the result of the software simulation. The total aberration of the micro wide-angle lens 1 can be reduced, and the aberrations of the lenses in the micro wide-angle lens 1 are complementary.

It should be noted that the above-mentioned software simulation is known to those skilled in the art. For example, the total aberration of the miniature wide-angle lens can be obtained by using the chief ray and the edge ray under various specific parameters (such as position, angle, and curvature). The face value or the refractive index is obtained by integrating the simulation results, so it will not be repeated here.

Please refer to the following table, which is an optical data sheet for creating a miniature wide-angle lens 1 in a preferred embodiment.

In the preferred embodiment, the focal length f of the overall miniature wide-angle lens 1 is 2.07 mm, and the focal length f1 of the first lens 11 is -1.47 mm, so the relationship between the two is f/f1=-0.84. Further, since the focal length f4 of the fourth lens 14 is 1.59 mm, the relational expression of the focal length f of the entire micro wide-angle lens 1 and the focal length f4 of the fourth lens 14 is f/f4 = 1.3.

Furthermore, in the preferred embodiment, half of the diagonal length of the effective pixel area of the electronic photosensitive element 18 is ImgH=2.84 mm, so the focal length f of the entire miniature wide-angle lens 1 and the effective pixel area of the electronic photosensitive element 18 The relationship of the half of the diagonal length ImgH is: ImgH / f = 1.37; in addition, the distance from the object side surface S1 of the first lens 11 to the electronic photosensitive element 18 on the optical axis 19 is TTL = 7.49 mm, so the first The relationship between the distance TTL of the object side surface S1 of the lens 11 to the optical photosensitive element 18 on the optical axis 19 and the diagonal length ImgH of the effective pixel area of the electronic photosensitive element 18 is: TTL / Imgh = 2.64; The focal length f2 of the second lens 12 is 11.5 mm, and the relationship between the focal length f1 of the first lens 11 and the focal length f2 of the second lens 12 is f1/f2 = -0.21.

Furthermore, in the preferred embodiment, the Abbe number V1 of the first lens 11 is 54.7, and the Abbe number V2 of the second lens 12 is 40.8, so the relationship between the two is V1-V2=13.9.

Furthermore, in the preferred embodiment, the refractive index I1 of the first lens 11 is 1.73, and the refractive index of the third lens 13 is 1.49, so the relationship between the two is: I3/I1=0.86; The refractive index I5 of the fifth lens 15 is 1.85, so the relationship between the refractive index I5 of the fifth lens 15 and the refractive index I1 of the first lens 11 is: I5/I1=1.07; in addition, the Abbe number V3 of the third lens 13 =70.2, so the relationship between the Abbe number V3 of the third lens 13 and the Abbe number V1 of the first lens 11 is: V3-V1 = 15.5; further, the Abbe number of the fifth lens 15 is V5 = 23.7, so The relationship between the Abbe number V1 of one lens 11 and the Abbe number V5 of the fifth lens 15 is V1-V5=31.

Furthermore, in the preferred embodiment, the refractive index I2 of the second lens 12 is 1.88, the Abbe number of the second lens 12 is V2=40.8, and the Abbe number of the fourth lens 14 is V4=54.7, fifth. The Abbe number V5 of the lens 15 is 23.7, so the relationship between the Abbe number V4 of the fourth lens 14 and the Abbe number V5 of the fifth lens 15 is: V4-V5=31; again, the refractive index of the fourth lens 14 I4=1.73, so the relationship between the refractive index I5 of the fifth lens 15 and the refractive index I4 of the fourth lens 14 is: I5-I4=0.12.

Please refer to FIG. 2, which is a modulation transfer function (MTF) graph obtained according to the optical data table shown above. The vertical axis coordinate of Figure 2 represents the modulation transfer function value, which A description of the resolution of the miniature wide-angle lens, that is, the ability of the miniature wide-angle lens to faithfully reproduce the sense of the object, is an important indicator of the image quality in the industry; and the horizontal axis coordinate of Figure 2 represents the spatial frequency, that is, within the unit length. The number of black and white pairs included; in addition, the tangential component T in the illustration represents the resolution of the tangential line of the miniature wide-angle lens (ie, the direction of the line is tangential to the concentric circle of the center of the electronic photosensitive element), and The radial component S (sagittal) in the illustration represents the resolution of the radial line of the miniature wide-angle lens (ie, the direction of the line is along the direction outward from the center of the electronic photosensitive element); wherein, Figure 2 illustrates the angle of 0 degrees, respectively. Tangent component T and radial component S at different spatial frequencies at degrees, 24 degrees, degrees, 56 degrees, degrees, and degrees Modulation conversion function value.

As can be seen from the figure, the miniature wide-angle lens of the present invention has excellent imaging quality in addition to the advantages of miniaturization and large field of view, and how to interpret the modulation conversion function graph is known to those skilled in the art. I understand that I will not repeat them here.

In addition, in the miniature wide-angle lens 1 of the present invention, any one of the first lens 11 to the fifth lens 15 may be made of a glass material or a plastic material; preferably, but not limited thereto, Each of the lens 11 to the fifth lens 15 is made of a glass material, so that the luminosity loss of the micro wide-angle lens 1 can be reduced, so that the image that can be obtained is bright and the resolution can be improved to 13M to 18M.

In particular, since the back focus of the micro wide-angle lens 1 of the present invention (that is, the distance between the fifth lens 15 and the imaging surface 10) is long enough, it is only required to be assembled by a LCC (Leadless Chip Carrier) package, such as CLCC (Ceramic Leadless). Chip Carrier), PLCC (Plastic Leadless Chip Carrier) package, etc., can reduce the manufacturing cost of the lens.

The above description is only the preferred embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, any equivalent changes or modifications made without departing from the spirit of the present invention should be included in the present case. Within the scope of the patent application.

1‧‧‧ miniature wide-angle lens

10‧‧‧ imaging surface

11‧‧‧First lens

12‧‧‧second lens

13‧‧‧ third lens

14‧‧‧Fourth lens

15‧‧‧ fifth lens

16‧‧‧ aperture

17‧‧‧Infrared filter

18‧‧‧Electronic photosensitive element

19‧‧‧ optical axis

S1‧‧‧ object side surface of the first lens

S2‧‧‧ Image side surface of the first lens

S3‧‧‧ object side surface of the second lens

Image side surface of S4‧‧‧ second lens

S5‧‧‧ object side surface of the third lens

S6‧‧‧ image side surface of the third lens

S7‧‧‧ object side surface of the fourth lens

S8‧‧‧ image side surface of the fourth lens

S9‧‧‧ object side surface of the fifth lens

S10‧‧‧ Image side surface of the fifth lens

Surface of S11‧‧‧ Infrared Filter

Surface of S12‧‧‧ Infrared Filter

Claims (10)

A miniature wide-angle lens includes, in order from its object end to the image end, a first lens having a negative refractive power; a second lens having a positive refractive power; and a third lens having a positive refractive power; a four lens having a positive refractive power; and a fifth lens having a negative refractive power, the miniature wide-angle lens satisfying at least one of the following conditions (1) to (4): (1) 0 < V1 - V2 < 20; (2) 1.78 < I5 < 2.2, 16 < V5 < 35, and the object side surface and the image side surface of the fifth lens are concave and convex, respectively; (3) 0.75 < I3 / I1 < 0.95, 1.05 < I5 / I1 <1.25, 15<V3-V1<40, and 20<V1-V5<45; and (4)1.65<I2<2.2, 35<V2<70, V4-V5>20, and I5-I4<0.4; V1 is the Abbe number (ABBE) of the first lens, V2 is the Abbe number of the second lens, V3 is the Abbe number of the third lens, V4 is the Abbe number of the fourth lens, and V5 is The Abbe number of the second lens, I1 is the refractive index of the first lens, I2 is the refractive index of the second lens, I3 is the refractive index of the third lens, and I4 is the refractive index of the fourth lens, I5 Is the refractive index of the fifth lens. The micro wide-angle lens as described in claim 1 further satisfies the following conditional formula: -3.2 < f / f1 < - 0.78; wherein f is the focal length of the overall micro wide-angle lens, and f1 is the focal length of the first lens. The micro wide-angle lens as described in claim 1 further satisfies the following conditional formula: 1<f/f4<2; wherein f is the focal length of the overall miniature wide-angle lens, and f4 is the focal length of the fourth lens. The micro wide-angle lens according to claim 1 further satisfies the following conditional formula: f1/f2<0; wherein f1 is the focal length of the first lens, and f2 is the focal length of the second lens. The micro wide-angle lens according to claim 1, further comprising an electronic photosensitive element for imaging a subject thereon, wherein the miniature wide-angle lens further satisfies the following condition: 1<ImgH/f<2 Where ImgH is half the diagonal length of the effective pixel area of the electronic photosensitive element, and f is the focal length of the overall miniature wide-angle lens. The micro wide-angle lens according to claim 1, further comprising an electronic photosensitive element for imaging a subject thereon, wherein the miniature wide-angle lens further satisfies the following condition: TTL/Imgh<3; The TTL is the distance from the object side surface of the first lens to the optical axis of the electronic photosensitive element, and ImgH is half the diagonal length of the effective pixel area of the electronic photosensitive element. The micro wide-angle lens of claim 1, further comprising an aperture disposed between the second lens and the third lens. The micro wide-angle lens of claim 1, further comprising an infrared filter disposed between the fifth lens and an imaging surface for filtering the plurality of noise lights. The miniature wide-angle lens as described in claim 1 is assembled by an LCC (Leadless Chip Carrier) package. The micro wide-angle lens of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are made of a glass material.