CN113341535A

CN113341535A - Wide-angle lens, image capturing device and electronic device

Info

Publication number: CN113341535A
Application number: CN202010138725.2A
Authority: CN
Inventors: 谢晗; 刘彬彬; 李明; 邹海荣
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Jingchao Optical Co Ltd
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2021-09-03

Abstract

The application relates to a wide-angle lens, an image capturing device and an electronic device. The wide-angle lens sequentially comprises a first lens with negative focal power from an object side to an image side along an optical axis, and the image side surface of the wide-angle lens is a concave surface at the optical axis; the object side surface of the second lens is a convex surface at the optical axis, and the image side surface of the second lens is a convex surface at the optical axis; a third lens having optical power; the image side surface of the fourth lens is convex at the optical axis; a fifth lens element with negative refractive power, wherein the object-side surface of the fifth lens element is convex at the optical axis, the image-side surface of the fifth lens element is concave at the optical axis, and at least one of the object-side surface and the image-side surface of the fifth lens element comprises at least one inflection point; and a diaphragm disposed between the first lens and the second lens; one of the first lens element to the fifth lens element is a glass lens element. When the wide-angle lens meets the specific relation, the wide-angle lens has the characteristic of a small head under the condition of ensuring a wide visual angle.

Description

Wide-angle lens, image capturing device and electronic device

Technical Field

The present invention relates to the field of optical imaging technologies, and in particular, to a wide-angle lens, an image capturing device and an electronic device.

Background

In recent years, with the development of science and technology, portable electronic products having an image capturing function have been gaining more popularity. The wide-angle lens has a larger shooting view, can shoot a large scene or a panoramic photo within a limited distance range, and can meet the requirements of users.

However, in order to ensure the imaging quality and have a large viewing angle range, the head of the conventional wide-angle lens is often made large, which is difficult to satisfy the development trend of light, thin and small electronic products; meanwhile, with the development of the CMOS chip technology, the pixel size of the chip is smaller and smaller, and the imaging quality requirement for the matched lens is higher and higher.

Disclosure of Invention

Based on this, it is necessary to provide an improved wide-angle lens for solving the problem that the conventional wide-angle lens has a large lens head while ensuring the imaging quality.

A wide-angle lens comprises a first lens with negative focal power along an optical axis from an object side to an image side, wherein the image side surface of the first lens is a concave surface at the optical axis; the second lens is provided with positive focal power, the object side surface of the second lens is a convex surface at the optical axis, and the image side surface of the second lens is a convex surface at the optical axis; a third lens having optical power; the fourth lens has positive focal power, and the image side surface of the fourth lens is convex at the optical axis; the optical lens comprises a fifth lens with negative focal power, wherein the object side surface of the fifth lens is a convex surface at the optical axis, the image side surface of the fifth lens is a concave surface at the optical axis, and at least one surface of the object side surface and the image side surface of the fifth lens comprises at least one inflection point; the diaphragm is arranged between the first lens and the second lens; one of the first lens element to the fifth lens element is a glass lens element, and the wide-angle lens element satisfies the following relationships:

sd1/ImgH＜0.36；

wherein sd1 represents the maximum effective half aperture of the object-side surface of the first lens, and ImgH is half of the length of the diagonal line of the effective pixel area on the imaging surface of the wide-angle lens.

According to the wide-angle lens, the aperture, the curvature and the shape of the first lens are optimized while the larger field angle is ensured, so that the aperture of the first lens is fully compressed, the size of the head of the wide-angle lens is reduced, and the application requirement of the light and thin electronic equipment can be better met; meanwhile, through reasonably distributing the focal power and the surface type of each lens and the distance between the lenses, the aberration of the wide-angle lens can be reduced, and the imaging quality of the wide-angle lens is ensured; in addition, one lens among the first lens to the fifth lens is set as a glass lens, so that the resolution of the wide-angle lens is further improved, the temperature drift of the glass lens in different temperature change environments is small, and the environmental sensitivity of the wide-angle lens is reduced.

In one embodiment, the wide-angle lens satisfies the following relationship: n is more than 1.7; wherein n represents a refractive index of the glass lens.

The refractive index of the glass lens is controlled to satisfy the above relationship so as to optimize the optical transfer function of the wide-angle lens by means of the glass lens having a higher refractive index, thereby further increasing the imaging resolution of the lens.

In one embodiment, the wide-angle lens satisfies the following relationship: -160 < f1/sd1 < -3; where f1 denotes an effective focal length of the first lens.

The first lens can provide negative focal power for the lens by controlling the effective focal length of the first lens and the maximum effective half aperture of the object side surface of the first lens to meet the relationship, so that light rays incident at a large angle can enter the lens, and the field angle of the lens is increased; meanwhile, the effective caliber of the object side surface of the first lens is reasonably configured to fully compress the outer diameter of the first lens, so that the miniaturization of the front end of the lens module is facilitated, and the lens has the structural characteristic of a small head.

In one embodiment, the wide-angle lens satisfies the following relationship: FOV is more than or equal to 80 degrees and less than 120 degrees; wherein the FOV represents a diagonal field angle of the wide-angle lens.

The field angle in the diagonal direction of the wide-angle lens is controlled to meet the relation, so that the shooting range of the lens is expanded, and the shooting experience of a user is improved.

In one embodiment, the wide-angle lens satisfies the following relationship: i CT 4/R42I > 0.37; wherein CT4 represents the thickness of the fourth lens on the optical axis, and R42 represents the radius of curvature of the image-side surface of the fourth lens at the optical axis.

The thickness of the fourth lens on the optical axis and the curvature radius of the image side surface of the fourth lens at the optical axis are controlled to meet the relation, so that the thickness of the fourth lens can be increased within a reasonable range, the surface shape of the fourth lens is more gentle, lens processing is facilitated, and lens ghost can be weakened.

In one embodiment, the wide-angle lens satisfies the following relationship: CT2 is more than 0.55 mm; wherein CT2 represents the thickness of the second lens on the optical axis.

The thickness of the second lens on the optical axis is controlled to meet the relation, so that the positive focal power of the second lens is improved, and the light rays can be better emitted into the wide-angle lens by adjusting the curvature radius and the shape of the object side surface of the second lens; meanwhile, the total length of the lens is shortened, and good imaging quality is guaranteed.

In one embodiment, the wide-angle lens satisfies the following relationship: f12/f is more than 0.69 and less than 1.2; where f12 denotes a combined focal length of the first lens and the second lens, and f denotes an effective focal length of the wide-angle lens.

The combined focal length of the first lens and the second lens and the effective focal length of the wide-angle lens are controlled to meet the relationship, so that the aberration and curvature of field of the wide-angle lens are corrected, and the lens has better shooting performance.

In one embodiment, the wide-angle lens satisfies the following relationship: TTL/ImgH is less than 1.85; wherein, TTL represents a distance on the optical axis from the object-side surface of the first lens element to the imaging surface of the wide-angle lens.

The distance (namely the total lens length) from the object side surface of the first lens to the imaging surface of the wide-angle lens on the optical axis and half of the length of the diagonal line of the effective pixel area on the imaging surface of the wide-angle lens meet the relationship, so that the total length of the wide-angle lens is favorably compressed, and the miniaturization of the lens is realized.

In one embodiment, the wide-angle lens satisfies the following relationship: 0.9 < ET5/CT5 < 2.3; wherein CT5 represents the thickness of the fifth lens on the optical axis, and ET5 represents the thickness of the fifth lens at the maximum effective aperture.

The thickness of the fifth lens on the optical axis and the thickness of the maximum effective aperture of the fifth lens meet the relationship, so that the fifth lens can provide negative focal power for the lens, the thickness of the effective aperture of the fifth lens can be reasonably increased, the aberration of the peripheral field of view can be better corrected, the imaging quality of the peripheral field of view can be improved, and the ghost image caused by the edge reflection of the lens can be weakened. However, it should be noted that the thickness of the effective aperture of the fifth lens should not be too thick or too thin, i.e. the above ratio should not exceed the upper limit or be lower than the lower limit, otherwise the thickness difference of the fifth lens is too large, which is not favorable for lens formation.

In one embodiment, the wide-angle lens satisfies the following relationship: 11.1 < f5/R52 < -2; wherein f5 represents an effective focal length of the fifth lens, and R52 represents a radius of curvature of an image-side surface of the fifth lens at an optical axis.

The effective focal length of the fifth lens and the curvature radius of the image side surface of the fifth lens at the optical axis are controlled to meet the relation, so that the fifth lens can provide negative focal power for the lens, the field curvature can be further corrected by reasonably configuring the convex surface type of the image side surface of the fifth lens, and meanwhile, the optical back focus of the wide-angle lens can be controlled within a reasonable range, so that the lens has telecentric property.

The application also provides an image capturing device.

An image capturing device comprises the wide-angle lens and a photosensitive element, wherein the photosensitive element is arranged on the image side of the wide-angle lens.

The image capturing device can shoot images with small aberration and high resolution under the condition of wide visual angle by using the wide-angle lens, and has the characteristic of small head, so that the image capturing device is convenient to adapt to devices with limited size such as light and thin electronic equipment.

The application also provides an electronic device, which comprises a shell and the image capturing device, wherein the image capturing device is arranged on the shell.

The electronic device has the structural characteristics of lightness and thinness, and can shoot images with wide visual angle and good imaging quality by utilizing the image capturing device, so that the shooting requirements of cameras of equipment such as mobile phones, vehicles, monitors, medical treatment and the like are met.

Drawings

Fig. 1 is a schematic structural view showing a wide-angle lens according to embodiment 1 of the present application;

fig. 2 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of the wide-angle lens of example 1, respectively;

fig. 3 is a schematic structural view showing a wide-angle lens according to embodiment 2 of the present application;

fig. 4 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of the wide-angle lens of example 2, respectively;

fig. 5 is a schematic structural view showing a wide-angle lens according to embodiment 3 of the present application;

fig. 6 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of the wide-angle lens of example 3, respectively;

fig. 7 is a schematic structural view showing a wide-angle lens according to embodiment 4 of the present application;

fig. 8 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart, respectively, of the wide-angle lens of example 4;

fig. 9 is a schematic structural view showing a wide-angle lens according to embodiment 5 of the present application;

fig. 10 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart, respectively, of the wide-angle lens of example 5;

fig. 11 is a schematic structural view showing a wide-angle lens according to embodiment 6 of the present application;

fig. 12 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of the wide-angle lens of example 6, respectively;

fig. 13 is a schematic structural view showing a wide-angle lens according to embodiment 7 of the present application;

fig. 14 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart, respectively, of the wide-angle lens of example 7;

fig. 15 is a schematic view of an image capturing apparatus according to an embodiment of the present application;

fig. 16 is a schematic diagram of an electronic device using an image capturing device according to an embodiment of the present application.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "front," "rear," "circumferential," and the like are based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.

For ease of illustration, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In order to ensure a wide viewing angle and imaging quality, the aperture of a first lens of a traditional wide-angle lens is usually large, and the application requirements of light and thin electronic products are difficult to meet; in addition, the edge shape of the first lens of such a wide-angle lens is curved to a greater extent, so that the mass production molding process of the lens is not high.

The defects existing in the above solutions are the results obtained after the inventor has practiced and studied carefully, so the discovery process of the above problems and the solutions proposed by the following embodiments of the present application for the above problems should be the contribution of the inventor to the present application in the process of the present application.

Referring to fig. 1, 3, 5, 7, 9, 11, and 13, the wide-angle lens according to the embodiment of the present disclosure includes five lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are sequentially arranged from the object side to the image side along the optical axis, and a diaphragm is arranged between the first lens and the second lens so as to effectively limit the size of a light beam and further improve the imaging quality.

The first lens has negative focal power, and the image side surface of the first lens is a concave surface at the optical axis, so that light rays incident at a large angle can be focused on the imaging surface of the wide-angle lens, and the visual angle and the imaging quality of the lens are ensured.

The second lens has positive focal power, the object side surface of the second lens is a convex surface at the optical axis, and the image side surface of the second lens is a convex surface at the optical axis, so that the aberration and the curvature of field of the lens are corrected, and the imaging quality of the lens is improved.

The third lens has focal power, and is beneficial to being matched with the second lens to correct chromatic aberration of the lens.

The fourth lens has positive focal power, and the image side surface of the fourth lens is a convex surface at the optical axis, so that the fourth lens is matched with the second lens and the third lens to further correct the chromatic aberration of the lens, and the imaging quality is improved.

The fifth lens has negative focal power, the object side surface of the fifth lens is a convex surface at the optical axis, the image side surface of the fifth lens is a concave surface at the optical axis, and at least one surface of the object side surface and the image side surface of the fifth lens comprises at least one inflection point. The angle of the light rays of the off-axis field of view incident on the photosensitive element can be effectively suppressed by setting the inflection point, and meanwhile, the aberration of the off-axis field of view can be further corrected, so that the imaging quality is improved.

One of the first lens element to the fifth lens element is a glass lens element. Because the optical transfer function of the lens can be optimized by the glass with higher refractive index, the imaging resolution of the wide-angle lens can be improved by selecting the glass lens, and meanwhile, the glass lens is more stable than a plastic lens in the temperature drift problem, so that the environmental sensitivity of the lens is favorably reduced. It should be noted that, because the manufacturing cost of the glass lens is relatively high, only one of the first lens element to the fifth lens element is selected as the glass lens, so that the balance between the improvement of the imaging quality of the lens and the control of the cost of the lens can be achieved.

Specifically, the wide-angle lens satisfies the following relation: sd1/ImgH < 0.36, where sd1 represents the maximum effective half aperture of the object-side surface of the first lens and ImgH is half the length of the diagonal of the effective pixel area on the imaging plane of the wide-angle lens. sd1/ImgH may be 0.2, 0.22, 0.24, 0.26, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34 or 0.35. Under the condition of satisfying the relational expression, the outer diameter of the first lens can be fully compressed while the lens has a larger field angle, so that the optical effective aperture of the first lens is optimized, the head size of the lens is reduced, and the application requirements of light and thin electronic equipment such as a mobile phone, a flat panel and the like are better met. When sd1/ImgH is equal to or greater than 0.36, the effective aperture of the first lens is easily made larger, which results in a larger outer diameter of the first lens, and is not favorable for realizing a small head of the lens.

In addition, the diaphragm may include an aperture diaphragm and a field diaphragm. Preferably, the diaphragm is an aperture diaphragm. The aperture stop may be located on a surface of the lens (e.g., the object side and the image side) and in operative relationship with the lens, for example, by applying a light blocking coating to the surface of the lens to form the aperture stop at the surface; or the surface of the clamping lens is fixedly clamped by the clamping piece, and the structure of the clamping piece on the surface can limit the width of the imaging light beam of the on-axis object point, so that the aperture stop is formed on the surface.

When the wide-angle lens is used for imaging, light rays emitted or reflected by a shot object enter the wide-angle lens from the object side direction, sequentially pass through the first lens, the second lens, the third lens, the fourth lens and the fifth lens, and finally converge on an imaging surface.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: n is more than 1.7; where n represents the refractive index of the glass lens. n may be 1.705, 1.71, 1.72, 1.73, 1.75, 1.77, 1.79, 1.81, 1.82, 1.83, or 1.85. By controlling the refractive index of the glass lens to satisfy the above relationship, the optical transfer function of the wide-angle lens can be optimized by the glass lens with a higher refractive index, thereby further improving the imaging resolution of the lens.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: -160 < f1/sd1 < -3; where f1 denotes the effective focal length of the first lens. f1/sd1 can be-159.1, -16, -15, -10, -9, -7, -5, -4.8, -4.6, -4.4, -4.2, -4, -3.8, -3.6 or-3.2. The first lens can provide negative focal power for the lens by controlling the effective focal length of the first lens and the maximum effective half aperture of the object side surface of the first lens to meet the relationship, so that light rays incident at a large angle can enter the lens, and the field angle of the lens is increased; meanwhile, the effective caliber of the object side surface of the first lens is reasonably configured to fully compress the outer diameter of the first lens, so that the miniaturization of the front end of the lens module is facilitated, and the lens has the structural characteristic of a small head. When f1/sd1 is less than or equal to-160, the first lens cannot provide enough negative power for the lens, so that the shooting effect of a wide angle of view is difficult to ensure, and when f1/sd1 is greater than or equal to-3, the effective aperture of the first lens is easy to be larger, which is not beneficial to realizing a small head of the lens.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: FOV is more than or equal to 80 degrees and less than 120 degrees; where FOV represents the diagonal field angle of the wide-angle lens. The FOV may be 80 °, 85 °, 90 °, 95 °, 100 °, 103 °, 106 °, 109 °, 112 °, 113 °, 114 °, 116 °, or 118 °. Preferably, the wide-angle lens satisfies a FOV of 100 DEG or more and 110 DEG or less. The field angle in the diagonal direction of the wide-angle lens is controlled to meet the relation, so that the shooting range of the lens is expanded, and the shooting experience of a user is improved.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: i CT 4/R42I > 0.37; wherein CT4 denotes the thickness of the fourth lens element on the optical axis, and R42 denotes the radius of curvature of the image-side surface of the fourth lens element on the optical axis. I CT4/R42 i may be 0.371, 0.372, 0.4, 0.6, 0.7, 0.71, 0.72, 0.73, 0.75, 0.9, 0.95, 1.0, 1.1, or 1.2. Under the condition that satisfies above-mentioned relation, can increase the thickness of fourth lens in reasonable within range, make the surface shape of fourth lens more gentle to make things convenient for lens processing, also be favorable to weakening the camera lens ghost simultaneously.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: CT2 is more than 0.55 mm; where CT2 denotes the thickness of the second lens on the optical axis. CT2 may be 0.555mm, 0.65mm, 0.7mm, 0.71mm, 0.73mm, 0.75mm, 0.77mm, 0.79mm, 0.81mm, 0.85mm, 0.89mm, 0.93mm or 0.95 mm. Under the condition of meeting the relation, the positive focal power of the second lens is favorably improved, and the light rays are better emitted into the wide-angle lens by adjusting the curvature radius and the shape of the object side surface of the second lens; meanwhile, the total length of the lens is shortened, and good imaging quality is guaranteed. When the CT2 is less than or equal to 0.55mm, sufficient positive focal power cannot be provided for the wide-angle lens, which is not favorable for focusing light rays incident at a large angle, and the imaging quality is difficult to ensure.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: f12/f is more than 0.69 and less than 1.2; where f12 denotes a combined focal length of the first lens and the second lens, and f denotes an effective focal length of the wide-angle lens. f12/f may be 0.691, 0.693, 0.8, 0.83, 0.86, 0.89, 0.92, 0.95, 0.98, 1.1, 1.15 or 1.18. Under the condition of satisfying the relation, the aberration and curvature of field of the wide-angle lens are corrected, so that the lens has better shooting performance. When f12/f is less than or equal to 0.69, the effective focal length of the lens is longer, which is not favorable for miniaturization of the lens; when f12/f is greater than or equal to 1.2, it is not favorable to provide enough positive focal power for the lens to focus and image the light entering the lens, and thus the imaging quality cannot be ensured.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: TTL/ImgH is less than 1.85; wherein, TTL represents a distance on the optical axis from the object side surface of the first lens element to the imaging surface of the wide-angle lens. TTL/ImgH can be 1.55, 1.56, 1.57, 1.6, 1.63, 1.66, 1.7, 1.75, 1.77, 1.79, 1.82, 1.84, or 1.845. The total length of the lens and the half-image height on the imaging surface of the wide-angle lens are controlled to meet the relation, so that the total length of the wide-angle lens can be compressed under the condition of ensuring the image quality, and the miniaturization of the lens is realized.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 0.9 < ET5/CT5 < 2.3; where CT5 denotes the thickness of the fifth lens on the optical axis, and ET5 denotes the thickness of the fifth lens at the maximum effective aperture. ET5/CT5 can be 0.93, 1.0, 1.2, 1.4, 1.5, 1.7, 1.75, 1.8, 2.0, 2.3, 2.6, 2.1, or 2.2. Furthermore, the wide-angle lens meets the requirement that ET5/CT5 is more than 1.8 and less than 2.3. Under the condition that the relation is met, the fifth lens can provide negative focal power for the lens, so that the thickness of the effective aperture of the fifth lens can be reasonably increased, the aberration of the peripheral field of view can be better corrected, the imaging quality of the peripheral field of view can be improved, and the ghost image caused by the edge reflection of the lens can be weakened. However, it should be noted that the thickness of the effective aperture of the fifth lens should not be too thick or too thin, i.e. the above ratio should not exceed the upper limit or be lower than the lower limit, otherwise the thickness difference of the fifth lens is too large, which is not favorable for lens formation.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 11.1 < f5/R52 < -2; where f5 denotes an effective focal length of the fifth lens, and R52 denotes a radius of curvature of an image-side surface of the fifth lens at the optical axis. f5/R52 can be-11.05, -10, -9, -7, -6.5, -6, -5.5, -5, -4.5, -4, -3.5, -3, -2.5 or-2.1. Under the condition of meeting the relation, the fifth lens can provide negative focal power for the lens, the field curvature can be further favorably corrected by reasonably configuring the convex surface type of the image side surface of the fifth lens, and meanwhile, the optical back focus of the wide-angle lens can be controlled within a reasonable range, so that the lens has telecentric property. When f5/R52 is more than or equal to-2, the surface shape of the image side surface of the fifth lens is too big, which is not beneficial to lens processing; when f5/R52 is less than or equal to-11.1, the fifth lens cannot provide enough negative focal power for the lens, so that the curvature of field of the lens is not corrected easily, and the back focal length of the lens is difficult to ensure.

In an exemplary embodiment, the lens materials other than the glass lens are plastic. The lens made of plastic can reduce the weight of the wide-angle lens and reduce the production cost.

In an exemplary embodiment, the wide-angle lens further includes an infrared filter. The infrared filter is arranged on the image side of the fifth lens and used for filtering incident light, particularly isolating infrared light and preventing the infrared light from being absorbed by the photosensitive element, so that the infrared light is prevented from influencing the color and the definition of a normal image, and the imaging quality of the wide-angle lens is improved.

The wide-angle lens of the above-described embodiment of the present application may employ a plurality of lenses, for example, five lenses as described above. Through rational distribution of focal length, focal power, surface type, thickness of each lens and on-axis distance between each lens, the wide-angle lens can be guaranteed to have a larger field angle, and simultaneously, the head is smaller, the weight is lighter and have higher imaging quality, and still possess great light ring (FNO can be 2.0), thereby can satisfy the application demand of lightweight electronic equipment such as cell-phone, flat board better. However, it will be appreciated by those skilled in the art that the number of lenses making up the wide-angle lens can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter.

Specific examples of the wide-angle lens applicable to the above-described embodiments are further described below with reference to the drawings. In the following embodiments, a lens surface is convex at least in the paraxial region if it is convex and the convex position is not defined; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The paraxial region here means a region near the optical axis. The surface of each lens closest to the object is called the object side surface, and the surface of each lens closest to the image plane is called the image side surface.

Example 1

The wide-angle lens 100 of embodiment 1 of the present application is described below with reference to fig. 1 to 2.

Fig. 1 shows a schematic configuration diagram of a wide-angle lens 100 of embodiment 1. As shown in fig. 1, the wide-angle lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, and an image plane S13.

The first lens element L1 has negative power, and has an object-side surface S1 and an image-side surface S2 both being aspheric, wherein the object-side surface S1 is concave at the optical axis and convex at the circumference, and the image-side surface S2 is concave at the optical axis and concave at the circumference.

The second lens element L2 has positive power, and has an object-side surface S3 and an image-side surface S4 both being aspheric, wherein the object-side surface S3 is convex at the optical axis and convex at the circumference, and the image-side surface S4 is convex at the optical axis and convex at the circumference.

The third lens element L3 has negative power, and both the object-side surface S5 and the image-side surface S6 are aspheric, wherein the object-side surface S5 is convex at the optical axis and concave at the circumference, and the image-side surface S6 is concave at the optical axis and concave at the circumference.

The fourth lens element L4 has positive power, and has an object-side surface S7 and an image-side surface S8 both being aspheric, wherein the object-side surface S7 is concave at the optical axis and concave at the circumference, and the image-side surface S8 is convex at the optical axis and convex at the circumference.

The fifth lens element L5 has negative power, and has an object-side surface S9 and an image-side surface S10 both being aspheric, wherein the object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

The object-side surface and the image-side surface of each of the first lens element L1 to the fifth lens element L5 are aspheric, which is advantageous for correcting aberrations and solving the problem of image surface distortion, and enables the lens elements to achieve excellent optical imaging effects even when the lens elements are small, thin, and flat, thereby enabling the wide-angle lens 100 to have a compact size.

The first lens L1 is made of glass, and the wide-angle lens 100 has small temperature drift change under different temperature change environments by using the glass lens, so that the wide-angle lens has better temperature tolerance characteristic; and the wide-angle lens 100 has a better optical transfer function, which is beneficial to improving the imaging resolution of the wide-angle lens 100.

A stop STO is further disposed between the first lens L1 and the second lens L2 to limit the size of an incident light beam, and further improve the imaging quality of the wide-angle lens 100. The wide-angle lens 100 further includes a filter 110 disposed on the image side of the fifth lens element and having an object-side surface S11 and an image-side surface S12. Light from the object OBJ sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane S13. Further, the optical filter 110 is an infrared filter for filtering out infrared light from the external light incident on the wide-angle lens 100, so as to avoid color distortion. Specifically, the material of the filter 110 is glass. The filter 110 may be a part of the wide-angle lens 100, and may be assembled with each lens, or may be installed when the wide-angle lens 100 is assembled with a photosensitive element.

Table 1 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of the lens of the wide-angle lens 100 of example 1, where the unit of the radius of curvature, thickness, and effective focal length of the lens is millimeters (mm). The surface of the lens closest to the object is called the object side surface, and the surface of the lens closest to the image plane is called the image side surface. In addition, taking lens L1 as an example, the first numerical value in the "thickness" parameter column of lens L1 is the thickness of the lens on the optical axis, and the second numerical value is the distance on the optical axis from the image-side surface of the lens to the object-side surface of the subsequent lens in the image-side direction; the numerical value of the stop ST0 in the "thickness" parameter column is the distance on the optical axis from the stop ST0 to the vertex of the object-side surface of the subsequent lens (the vertex refers to the intersection point of the lens and the optical axis), and we default that the direction from the object-side surface of the first lens L1 to the image-side surface of the last lens is the positive direction of the optical axis, when the value is negative, it indicates that the stop ST0 is disposed on the right side of the vertex of the object-side surface of the lens, and if the thickness of the stop STO is positive, the stop is on the left side of the vertex of the object-side surface of the lens.

TABLE 1

The aspherical surface shape of each lens is defined by the following formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1); k is a conic coefficient; ai is the ith order coefficient of the aspheric surface. Table 2 below gives the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the aspherical surfaces S1 to S10 of the lens in example 1.

TABLE 2

In this embodiment, ImgH, which is half the diagonal length of the effective pixel area on the imaging surface S13 of the wide-angle lens 100, is 2.28mm, and it can be seen from the data in tables 1 and 2 that the wide-angle lens 100 in embodiment 1 satisfies:

sd1/ImgH is 0.339, where sd1 denotes the maximum effective half aperture of the object-side surface S1 of the first lens L1, and ImgH is half the length of the diagonal line of the effective pixel region on the imaging surface S13 of the wide-angle lens 100;

n is 1.811, where n represents the refractive index of the glass lens, and for example, in this embodiment, since the material of the first lens L1 is glass, the refractive index of the glass lens is the refractive index of the first lens L1;

f1/sd1 is-4.09, where f1 denotes an effective focal length of the first lens L1;

FOV is 106.4 °, where FOV represents the diagonal field angle of the wide-angle lens 100;

i CT4/R42| ═ 0.988, where CT4 denotes the thickness of the fourth lens L4 on the optical axis, and R42 denotes the radius of curvature of the image side S8 of the fourth lens L4 at the optical axis;

CT2 ═ 0.718mm, where CT2 denotes the thickness of the second lens L2 on the optical axis;

12/f 1.157, where f12 denotes a combined focal length of the first lens L1 and the second lens L2, and f denotes an effective focal length of the wide-angle lens 100;

TTL/ImgH is 1.842, where TTL represents the distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S13 of the wide-angle lens 100;

ET5/CT5 is 2.03, where CT5 denotes the thickness of the fifth lens L5 on the optical axis, and ET5 denotes the thickness of the fifth lens L5 at the maximum effective aperture;

f5/R52 is-3.858, where f5 denotes an effective focal length of the fifth lens L5, and R52 denotes a radius of curvature of the fifth lens L5 image side S10 at the optical axis.

Fig. 2 shows a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of wide-angle lens 100 of example 1, respectively, with reference wavelength of wide-angle lens 100 being 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the wide-angle lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of the light with the wavelength of 555nm after passing through the wide-angle lens 100; the distortion graph shows the distortion rate of light with a wavelength of 555nm after passing through the wide-angle lens 100 at different image heights. As can be seen from fig. 2, the wide-angle lens 100 according to embodiment 1 can achieve good imaging quality.

Example 2

The wide-angle lens 100 of embodiment 2 of the present application is described below with reference to fig. 3 to 4. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of wide-angle lens 100 according to embodiment 2 of the present application.

As shown in fig. 3, the wide-angle lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, and an image plane S13.

The third lens L3 is made of glass, and the wide-angle lens 100 has small temperature drift change under different temperature change environments by using the glass lens, so that the wide-angle lens has a good temperature tolerance characteristic; and the wide-angle lens 100 has a better optical transfer function, which is beneficial to improving the imaging resolution of the wide-angle lens 100.

A stop STO is further disposed between the first lens L1 and the second lens L2 to limit the size of an incident light beam, and further improve the imaging quality of the wide-angle lens 100. The wide-angle lens 100 further includes a filter 110 disposed on the image side of the fifth lens element and having an object-side surface S11 and an image-side surface S12. Light from the object OBJ sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane S13. Further, the optical filter 110 is an infrared filter for filtering out infrared light from the external light incident on the wide-angle lens 100, so as to avoid color distortion.

Table 3 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of wide-angle lens 100 of example 2, where the unit of radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 4 shows high-order term coefficients that can be used for the lens aspheres S1-S10 in example 2, in which the aspherical surface types can be defined by formula (1) given in example 1; table 5 shows the values of the relevant parameters of the wide-angle lens 100 given in embodiment 2.

TABLE 3

TABLE 4

TABLE 5

Fig. 4 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of wide-angle lens 100 of example 2, respectively, with reference wavelength of wide-angle lens 100 being 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the wide-angle lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of the light with the wavelength of 555nm after passing through the wide-angle lens 100; the distortion graph shows the distortion rate of light with a wavelength of 555nm after passing through the wide-angle lens 100 at different image heights. As can be seen from fig. 4, the wide-angle lens 100 according to embodiment 2 can achieve good imaging quality.

Example 3

The wide-angle lens 100 of embodiment 3 of the present application is described below with reference to fig. 5 to 6. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 5 shows a schematic structural diagram of wide-angle lens 100 according to embodiment 3 of the present application.

As shown in fig. 5, the wide-angle lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, and an image plane S13.

The first lens element L1 has negative power, and both the object-side surface S1 and the image-side surface S2 are aspheric, wherein the object-side surface S1 is convex at the optical axis and convex at the circumference, and the image-side surface S2 is concave at the optical axis and concave at the circumference.

The fourth lens element L4 has positive power, and has an object-side surface S7 and an image-side surface S8 both being aspheric, wherein the object-side surface S7 is concave at the optical axis and concave at the circumference, and the image-side surface S8 is convex at the optical axis and concave at the circumference.

Table 6 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of wide-angle lens 100 of example 3, where the unit of radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 7 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S10 in embodiment 3, wherein the aspherical surface type can be defined by formula (1) given in embodiment 1; table 8 shows the values of the relevant parameters of the wide-angle lens 100 given in embodiment 3.

TABLE 6

TABLE 7

TABLE 8

Fig. 6 shows a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of wide-angle lens 100 of example 3, respectively, with wide-angle lens 100 having a reference wavelength of 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the wide-angle lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of the light with the wavelength of 555nm after passing through the wide-angle lens 100; the distortion graph shows the distortion rate of light with a wavelength of 555nm after passing through the wide-angle lens 100 at different image heights. As can be seen from fig. 6, the wide-angle lens 100 according to embodiment 3 can achieve good imaging quality.

Example 4

The wide-angle lens 100 of embodiment 4 of the present application is described below with reference to fig. 7 to 8. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 7 shows a schematic structural diagram of wide-angle lens 100 according to embodiment 4 of the present application.

As shown in fig. 7, the wide-angle lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, and an image plane S13.

The second lens element L2 has positive power, and has an object-side surface S3 and an image-side surface S4 both being aspheric, wherein the object-side surface S3 is convex at the optical axis and concave at the circumference, and the image-side surface S4 is convex at the optical axis and convex at the circumference.

The second lens L2 is made of glass, and the wide-angle lens 100 has small temperature drift change under different temperature change environments by using the glass lens, so that the wide-angle lens has better temperature tolerance characteristic; and the wide-angle lens 100 has a better optical transfer function, which is beneficial to improving the imaging resolution of the wide-angle lens 100.

Table 9 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of wide-angle lens 100 of example 4, where the unit of radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 10 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S10 in embodiment 4, wherein the aspherical surface types can be defined by formula (1) given in embodiment 1; table 11 shows the values of the relevant parameters of the wide-angle lens 100 given in embodiment 4.

TABLE 9

Watch 10

TABLE 11

Fig. 8 shows a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of wide-angle lens 100 of example 4, respectively, with wide-angle lens 100 having a reference wavelength of 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the wide-angle lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of the light with the wavelength of 555nm after passing through the wide-angle lens 100; the distortion graph shows the distortion rate of light with a wavelength of 555nm after passing through the wide-angle lens 100 at different image heights. As can be seen from fig. 8, the wide-angle lens 100 according to embodiment 4 can achieve good imaging quality.

Example 5

The wide-angle lens 100 of embodiment 5 of the present application is described below with reference to fig. 9 to 10. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 9 shows a schematic structural diagram of wide-angle lens 100 according to embodiment 5 of the present application.

As shown in fig. 9, the wide-angle lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, and an image plane S13.

Table 12 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of wide-angle lens 100 of example 5, where the unit of radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 13 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S10 in example 5, wherein the aspherical surface type can be defined by formula (1) given in example 1; table 14 shows the values of the relevant parameters of the wide-angle lens 100 given in embodiment 5.

TABLE 12

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TABLE 14

Fig. 10 shows a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of wide-angle lens 100 of example 5, respectively, with wide-angle lens 100 having a reference wavelength of 587.56 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays with wavelengths of 486.13nm, 587.56nm, and 656.27nm through the wide-angle lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of a light ray with a wavelength of 587.56nm after passing through the wide-angle lens 100; the distortion graph shows the distortion rate of light with a wavelength of 587.56nm after passing through the wide-angle lens 100 at different image heights. As can be seen from fig. 10, the wide-angle lens 100 according to embodiment 5 can achieve good imaging quality.

Example 6

The wide-angle lens 100 of embodiment 6 of the present application is described below with reference to fig. 11 to 12. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 11 shows a schematic structural diagram of wide-angle lens 100 according to embodiment 6 of the present application.

As shown in fig. 11, the wide-angle lens 100 includes, in order from an object side to an image side along an optical axis, a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, and an image plane S13.

The third lens element L3 has negative power, and both the object-side surface S5 and the image-side surface S6 are aspheric, wherein the object-side surface S5 is convex at the optical axis and convex at the circumference, and the image-side surface S6 is concave at the optical axis and concave at the circumference.

Table 15 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of wide-angle lens 100 of example 6, where the unit of radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 16 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S10 in example 6, wherein the aspherical surface types can be defined by formula (1) given in example 1; table 17 shows the values of the relevant parameters of the wide-angle lens 100 given in embodiment 6.

Watch 15

TABLE 16

TABLE 17

Fig. 12 shows a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of wide-angle lens 100 of example 6, respectively, with wide-angle lens 100 having a reference wavelength of 587.56 nm. Wherein the longitudinal spherical aberration plots show the convergent focus deviations of light rays with wavelengths of 486.13nm, 587.56nm, and 656.27nm through the wide-angle lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of a light ray with a wavelength of 587.56nm after passing through the wide-angle lens 100; the distortion graph shows the distortion rate of light with a wavelength of 587.56nm after passing through the wide-angle lens 100 at different image heights. As can be seen from fig. 12, the wide-angle lens 100 according to embodiment 6 can achieve good imaging quality.

Example 7

The wide-angle lens 100 of embodiment 7 of the present application is described below with reference to fig. 13 to 14. In this embodiment, a description of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 13 is a schematic structural view showing wide-angle lens 100 according to embodiment 7 of the present application.

The fourth lens element L4 has positive power, and has an object-side surface S7 and an image-side surface S8 both being aspheric, wherein the object-side surface S7 is concave at the optical axis and convex at the circumference, and the image-side surface S8 is convex at the optical axis and convex at the circumference.

Table 18 shows the surface type, radius of curvature, thickness, material, refractive index, abbe number (i.e., abbe number), and effective focal length of each lens of wide-angle lens 100 of example 7, where the unit of radius of curvature, thickness, and effective focal length of each lens is millimeters (mm). Table 19 shows high-order term coefficients that can be used for the lens aspherical surfaces S1 to S10 in example 7, wherein the aspherical surface types can be defined by formula (1) given in example 1; table 20 shows the values of the relevant parameters of the wide-angle lens 100 given in embodiment 7.

Watch 18

Watch 19

Watch 20

Fig. 14 shows a longitudinal spherical aberration chart, an astigmatism chart, and a distortion chart of wide-angle lens 100 of example 7, respectively, with reference wavelength of wide-angle lens 100 being 555 nm. Wherein the longitudinal spherical aberration plots show the deviation of the convergence focus of light rays with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the wide-angle lens 100; the astigmatism graph shows meridional field curvature and sagittal field curvature of the light with the wavelength of 555nm after passing through the wide-angle lens 100; the distortion graph shows the distortion rate of light with a wavelength of 555nm after passing through the wide-angle lens 100 at different image heights. As can be seen from fig. 14, the wide-angle lens 100 according to embodiment 7 can achieve good imaging quality.

As shown in fig. 15, the present application further provides an image capturing apparatus 200, which includes the wide-angle lens 100 as described above; and a light receiving element 210, the light receiving element 210 being disposed on the image side of the wide-angle lens 100, a light receiving surface of the light receiving element 210 coinciding with the image forming surface S13. Specifically, the photosensitive element 210 may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled Device (CCD) image sensor.

The image capturing device 200 can capture an image with small aberration and high resolution by using the wide-angle lens 100 under the condition of a wide angle of view, and the image capturing device 200 also has the characteristic of a small head, so that the image capturing device is convenient to adapt to devices with limited size, such as light and thin electronic equipment. The system can be used as a mobile phone camera, a vehicle-mounted camera, a monitoring camera or an endoscope and the like.

As shown in fig. 16, the present application further provides an electronic device 300, which includes a housing 310 and the image capturing device 200 as described above, wherein the image capturing device 200 is mounted on the housing 310. Specifically, the image capturing device 200 is disposed in the housing 310 and exposed from the housing 310 to obtain an image, the housing 310 can provide protection for the image capturing device 200, such as dust prevention, water prevention, falling prevention, and the like, and the housing 310 is provided with a hole corresponding to the image capturing device 200, so that light rays can penetrate into or out of the housing through the hole.

The electronic device 300 has a light and thin structure, and the image capturing device 200 can capture images with a wide viewing angle and good imaging quality, so as to meet the requirements of cameras of mobile phones, vehicles, monitors, medical devices, and the like.

In other embodiments, the use of "electronic device" may also include, but is not limited to, devices configured to receive or transmit communication signals via a wireline connection and/or via a wireless interface. Electronic devices arranged to communicate over a wireless interface may be referred to as "wireless communication terminals", "wireless terminals", or "mobile terminals". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communication System (PCS) terminals that may combine a cellular radiotelephone with data processing, facsimile and data communication capabilities; personal Digital Assistants (PDAs) that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A wide-angle lens, comprising, in order from an object side to an image side along an optical axis:

a first lens having a negative optical power, an image side surface of the first lens being concave at an optical axis;

the second lens is provided with positive focal power, the object side surface of the second lens is a convex surface at the optical axis, and the image side surface of the second lens is a convex surface at the optical axis;

a third lens having optical power;

the fourth lens has positive focal power, and the image side surface of the fourth lens is convex at the optical axis;

the optical lens comprises a fifth lens with negative focal power, wherein the object side surface of the fifth lens is a convex surface at the optical axis, the image side surface of the fifth lens is a concave surface at the optical axis, and at least one surface of the object side surface and the image side surface of the fifth lens comprises at least one inflection point; and the number of the first and second groups,

the diaphragm is arranged between the first lens and the second lens;

one of the first lens element to the fifth lens element is a glass lens element, and the wide-angle lens element satisfies the following relationships:

sd1/ImgH＜0.36；

2. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

n＞1.7；

wherein n represents a refractive index of the glass lens.

3. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

-160＜f1/sd1＜-3；

where f1 denotes an effective focal length of the first lens.

4. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

80°≤FOV＜120°；

wherein the FOV represents a diagonal field angle of the wide-angle lens.

5. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

|CT4/R42|＞0.37；

wherein CT4 represents the thickness of the fourth lens on the optical axis, and R42 represents the radius of curvature of the image-side surface of the fourth lens at the optical axis.

6. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

CT2＞0.55mm；

wherein CT2 represents the thickness of the second lens on the optical axis.

7. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

0.69＜f12/f＜1.2；

where f12 denotes a combined focal length of the first lens and the second lens, and f denotes an effective focal length of the wide-angle lens.

8. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

TTL/ImgH＜1.85；

wherein, TTL represents a distance on the optical axis from the object-side surface of the first lens element to the imaging surface of the wide-angle lens.

9. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

0.9＜ET5/CT5＜2.3；

wherein CT5 represents the thickness of the fifth lens on the optical axis, and ET5 represents the thickness of the fifth lens at the maximum effective aperture.

10. The wide-angle lens of claim 1, wherein the wide-angle lens satisfies the following relationship:

-11.1＜f5/R52＜-2；

wherein f5 represents an effective focal length of the fifth lens, and R52 represents a radius of curvature of an image-side surface of the fifth lens at an optical axis.

11. An image capturing apparatus, comprising the wide-angle lens according to any one of claims 1 to 10, and a photosensitive element disposed on an image side of the wide-angle lens.

12. An electronic device, comprising a housing and the image capturing device as claimed in claim 11, wherein the image capturing device is mounted on the housing.