Wide-angle lens, imaging device and electronic device

Abstract

The present application relates to a wide-angle lens, an imaging device and an electronic device. The wide-angle lens includes, in order from the object side to the image side along the optical axis, a first lens with negative optical power, whose image side surface is concave at the optical axis; a second lens with positive optical power, whose object side surface is convex at the optical axis and whose image side surface is convex at the optical axis; a third lens with optical power; a fourth lens with positive optical power, whose image side surface is convex at the optical axis; a fifth lens with negative optical power, whose object side surface is convex at the optical axis and whose image side surface is concave at the optical axis, and at least one of its object side surface and image side surface contains at least one inflection point; and an aperture, which is provided between the first lens and the second lens; one of the first lens to the fifth lens is a glass lens. When the above wide-angle lens satisfies a specific relationship, it can have the characteristics of a small head while ensuring a wide viewing angle.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to a wide-angle lens, an imaging device and an electronic device. Background Art

[0002] In recent years, with the development of science and technology, portable electronic products with camera functions have become more and more popular. Among them, wide-angle lenses have a larger shooting field of view and can capture large scenes or panoramic photos within a limited distance, which can better meet user needs.

[0003] However, in order to ensure image quality while having a large viewing angle, traditional wide-angle lenses often have relatively large heads, which makes it difficult to meet the development trend of lightweight and miniaturized electronic products. At the same time, with the development of CMOS chip technology, the pixel size of the chip is getting smaller and smaller, and the image quality requirements of the corresponding lenses are also getting higher and higher. Summary of the Invention

[0004] Based on this, it is necessary to provide an improved wide-angle lens to address the problem that the traditional wide-angle lens has a large lens head while ensuring imaging quality.

[0005] A wide-angle lens, comprising, in order from the object side to the image side along the optical axis, a first lens having negative optical power, the image-side surface of the first lens being concave at the optical axis; a second lens having positive optical power, the object-side surface of the second lens being convex at the optical axis, and the image-side surface of the second lens being convex at the optical axis; a third lens having optical power; a fourth lens having positive optical power, the image-side surface of the fourth lens being convex at the optical axis; a fifth lens having negative optical power, the object-side surface of the fifth lens being convex at the optical axis, and the image-side surface of the fifth lens being concave at the optical axis, and at least one of the object-side surface and the image-side surface of the fifth lens including at least one inflection point; and a stop, the stop being disposed between the first lens and the second lens; one of the first to fifth lenses being a glass lens, and the wide-angle lens satisfying the following relationship:

[0006] sd1 / ImgH<0.36;

[0007] Wherein, sd1 represents the maximum effective semi-aperture of the object side of the first lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the wide-angle lens.

[0008] The wide-angle lens, while ensuring a wide field of view, optimizes the aperture, curvature, and shape of the first lens to fully compress the aperture of the first lens, thereby reducing the head size of the wide-angle lens and enabling it to better meet the application requirements of thin and light electronic devices. At the same time, by rationally allocating the optical power, surface shape, and spacing between the lenses, the aberrations of the wide-angle lens can be reduced, thereby ensuring the imaging quality of the wide-angle lens. Furthermore, by configuring one of the first to fifth lenses as a glass lens, the resolution of the wide-angle lens is further improved. Furthermore, glass lenses have little temperature drift under varying temperature conditions, which helps reduce the environmental sensitivity of the wide-angle lens.

[0009] In one embodiment, the wide-angle lens satisfies the following relationship: n>1.7; wherein n represents the refractive index of the glass lens.

[0010] 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 with the help of a glass lens with a higher refractive index, thereby further improving the imaging resolution of the lens.

[0011] In one embodiment, the wide-angle lens satisfies the following relationship: -160<f1 / sd1<-3; wherein f1 represents the effective focal length of the first lens.

[0012] By controlling the effective focal length of the first lens and the maximum effective semi-aperture of the object side of the first lens to satisfy the above relationship, the first lens can provide the lens with negative optical power, thereby facilitating the entry of light incident at a large angle into the lens and increasing the field of view of the lens; at the same time, by rationally configuring the effective aperture of the object side of the first lens to fully compress the outer diameter of the first lens, it is beneficial to miniaturize the front end of the lens module, so that the lens has the structural characteristics of a small head.

[0013] In one embodiment, the wide-angle lens satisfies the following relationship: 80°≤FOV<120°; wherein FOV represents the diagonal field of view of the wide-angle lens.

[0014] By controlling the diagonal field of view of the wide-angle lens to satisfy the above relationship, it is beneficial to expand the shooting range of the lens and enhance the user's shooting experience.

[0015] In one embodiment, 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 curvature radius of the image side of the fourth lens at the optical axis.

[0016] By controlling the thickness of the fourth lens on the optical axis and the radius of curvature of the image-side surface of the fourth lens at the optical axis to satisfy the above relationship, the thickness of the fourth lens can be increased within a reasonable range, making the surface shape of the fourth lens smoother, thereby facilitating lens processing and also helping to reduce lens ghosting.

[0017] In one embodiment, the wide-angle lens satisfies the following relationship: CT2>0.55mm; wherein CT2 represents the thickness of the second lens on the optical axis.

[0018] By controlling the thickness of the second lens on the optical axis to satisfy the above relationship, the positive focal power of the second lens is improved, and by adjusting the curvature radius and shape of the object side of the second lens, light is better injected into the wide-angle lens. It also helps to shorten the overall length of the lens while ensuring good imaging quality.

[0019] In one embodiment, the wide-angle lens satisfies the following relationship: 0.69<f12 / f<1.2; wherein f12 represents the combined focal length of the first lens and the second lens, and f represents the effective focal length of the wide-angle lens.

[0020] By controlling the combined focal length of the first lens and the second lens to satisfy the above relationship with the effective focal length of the wide-angle lens, it is beneficial to correct the aberration and field curvature of the wide-angle lens, thereby making the lens have better shooting performance.

[0021] In one embodiment, the wide-angle lens satisfies the following relationship: TTL / ImgH<1.85; wherein TTL represents the distance from the object side surface of the first lens to the imaging surface of the wide-angle lens on the optical axis.

[0022] By controlling the distance from the object side of the first lens to the imaging plane of the wide-angle lens on the optical axis (i.e., the total length of the lens) and half of the diagonal length of the effective pixel area on the imaging plane of the wide-angle lens to satisfy the above relationship, it is beneficial to shorten the total length of the wide-angle lens and achieve miniaturization of the lens.

[0023] 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.

[0024] By controlling the thickness of the fifth lens element on the optical axis and at its maximum effective aperture to satisfy the aforementioned relationship, the fifth lens element can provide negative optical power to the lens and its thickness at the effective aperture can be appropriately increased to better correct aberrations in the peripheral field of view, improving image quality in the peripheral field of view while also reducing ghosting caused by reflections from the lens edges. However, it is important to note that the thickness of the fifth lens element at the effective aperture should not be too thick or too thin. In other words, the aforementioned ratio should not exceed the upper limit or fall below the lower limit. Otherwise, the overall thickness difference of the fifth lens element will be too large, hindering lens formation.

[0025] In one embodiment, the wide-angle lens satisfies the following relationship: -11.1<f5 / R52<-2; wherein f5 represents the effective focal length of the fifth lens element, and R52 represents the curvature radius of the image side surface of the fifth lens element at the optical axis.

[0026] By controlling the effective focal length of the fifth lens element and the radius of curvature of the image-side surface of the fifth lens element at the optical axis to satisfy the above relationship, the fifth lens element can provide negative optical power for the lens. By properly configuring the convex surface shape of the image-side surface of the fifth lens element, it is beneficial to further correct field curvature. At the same time, the optical back focus of the wide-angle lens can be controlled within a reasonable range, making the lens have a telecentric characteristic.

[0027] The present application also provides an imaging device.

[0028] An imaging device comprises the wide-angle lens as described above and a photosensitive element, wherein the photosensitive element is arranged on the image side of the wide-angle lens.

[0029] The above-mentioned imaging device, using the aforementioned wide-angle lens, can capture images with small aberrations and high resolution at a wider viewing angle. At the same time, the imaging device also has the characteristic of a small head, which is convenient for adaptation to devices with limited size such as thin and light electronic devices.

[0030] The present application also provides an electronic device, comprising a housing and the imaging device as described above, wherein the imaging device is mounted on the housing.

[0031] The above-mentioned electronic device has the characteristics of a light and thin structure. Using the imaging device as described above, images with a wide viewing angle and good imaging quality can be captured, meeting the shooting requirements of cameras of equipment such as mobile phones, vehicles, monitoring, and medical devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the structure of the wide-angle lens of Example 1 of the present application is shown;

[0033] Figure 2 1. The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the wide-angle lens of Example 1 are shown respectively;

[0034] Figure 3 Schematic diagram of the structure of the wide-angle lens of Example 2 of the present application is shown;

[0035] Figure 4 Graphs showing longitudinal spherical aberration, astigmatism, and distortion of the wide-angle lens of Example 2 are shown respectively;

[0036] Figure 5 Schematic diagram of the structure of the wide-angle lens of Example 3 of the present application is shown;

[0037] Figure 6 Graphs showing longitudinal spherical aberration, astigmatism, and distortion of the wide-angle lens of Example 3 are shown respectively;

[0038] Figure 7 Schematic diagram of the structure of the wide-angle lens of Example 4 of the present application is shown;

[0039] Figure 8 Graphs showing longitudinal spherical aberration, astigmatism, and distortion of the wide-angle lens of Example 4 are shown respectively;

[0040] Figure 9 Schematic diagram of the structure of the wide-angle lens of Example 5 of the present application is shown;

[0041] Figure 10 Graphs showing the longitudinal spherical aberration, astigmatism, and distortion of the wide-angle lens of Example 5 are shown respectively;

[0042] Figure 11 Schematic diagram of the structure of the wide-angle lens of Example 6 of the present application is shown;

[0043] Figure 12 Graphs showing longitudinal spherical aberration, astigmatism, and distortion of the wide-angle lens of Example 6 are shown respectively;

[0044] Figure 13 Schematic diagram of the structure of the wide-angle lens of Example 7 of the present application is shown;

[0045] Figure 14 Graphs showing the longitudinal spherical aberration, astigmatism, and distortion of the wide-angle lens of Example 7 are shown respectively;

[0046] Figure 15 A schematic diagram of an imaging device according to an embodiment of the present application is shown;

[0047] Figure 16 A schematic diagram of an electronic device using an imaging device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0048] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0049] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered thereon. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down", "front", "rear", "circumferential" and similar expressions used herein are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0050] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0051] For ease of explanation, the shapes of spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] In order to ensure a wide viewing angle and image quality, the aperture of the first lens of a traditional wide-angle lens is usually relatively large, which makes it difficult to meet the application requirements of thin and light electronic products. In addition, the edge shape of the first lens of this type of wide-angle lens is highly curved, so the mass production molding process of the lens is not advanced.

[0054] The defects in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed in the embodiments of this application below should be the contributions made by the inventor to this application during the application process.

[0055] Please also refer to Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 、 Figure 11 and Figure 13 The wide-angle lens of the present embodiment includes five lenses with optical power: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. These five lenses are arranged sequentially along the optical axis from the object side to the image side. A stop is provided between the first lens and the second lens to effectively limit the beam size and further improve image quality.

[0056] The first lens has negative optical power, and its image side surface is concave at the optical axis, which helps to focus light incident at a large angle onto the imaging surface of the wide-angle lens, ensuring the lens viewing angle and imaging quality.

[0057] The second lens has positive optical power, and its object-side surface is convex at the optical axis, and its image-side surface is convex at the optical axis, which is beneficial for focusing the light passing through the aperture, correcting the aberration and field curvature of the lens, and improving the imaging quality of the lens.

[0058] The third lens has optical power, which is beneficial for correcting lens chromatic aberration in cooperation with the second lens.

[0059] The fourth lens has positive refractive power, and the image side surface of the fourth lens is convex at the optical axis, which is conducive to further correcting lens chromatic aberration in cooperation with the second lens and the third lens, thereby improving image quality.

[0060] The fifth lens element has negative power, with its object-side surface convex at the optical axis and its image-side surface concave at the optical axis. At least one of these surfaces contains at least one inflection point. This inflection point effectively suppresses the angle at which off-axis light rays strike the image sensor, further correcting aberrations in this area and improving image quality.

[0061] One of the first through fifth lenses is a glass lens. Because glass with a higher refractive index can optimize the optical transfer function of a lens, using a glass lens can improve the imaging resolution of wide-angle lenses. Glass lenses are also more stable than plastic lenses in the face of temperature drift, thus reducing the lens's environmental sensitivity. It's important to note that due to the high manufacturing cost of glass lenses, only one of the first through fifth lenses is sufficient, thus achieving a balance between improving imaging quality and controlling lens costs.

[0062] Specifically, the wide-angle lens satisfies the following relationship: sd1 / ImgH<0.36, where sd1 represents the maximum effective semi-aperture of the object side of the first lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the wide-angle lens. sd1 / ImgH can 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 that the above relationship is satisfied, the lens can have a larger field of view while fully compressing the outer diameter of the first lens, thereby optimizing the optical effective aperture of the first lens and reducing the head size of the lens to better meet the application requirements of thin and light electronic devices such as mobile phones and tablets. When sd1 / ImgH is greater than or equal to 0.36, it is easy to make the effective aperture of the first lens larger, resulting in a larger outer diameter of the first lens, which is not conducive to the realization of a small head of the lens.

[0063] In addition, the diaphragm may include an aperture diaphragm and a field diaphragm. Preferably, the diaphragm is an aperture diaphragm. The aperture diaphragm may be located on a surface of the lens (e.g., the object side and the image side) and form an operative relationship with the lens. For example, the aperture diaphragm may be formed on the surface of the lens by applying a light-blocking coating thereon; or the surface of the lens may be fixedly clamped by a clamping member, where the clamping member structure located on the surface can limit the width of the imaging beam of the on-axis object point, thereby forming an aperture diaphragm on the surface.

[0064] When the wide-angle lens is used for imaging, light emitted or reflected by the subject enters the wide-angle lens from the object side, passes through the first lens, second lens, third lens, fourth lens and fifth lens in sequence, and finally converges onto the imaging surface.

[0065] The wide-angle lens, while ensuring a wide field of view, optimizes the aperture, curvature, and shape of the first lens to fully compress the aperture of the first lens, thereby reducing the head size of the wide-angle lens and enabling it to better meet the application requirements of thin and light electronic devices. At the same time, by rationally allocating the optical power, surface shape, and spacing between the lenses, the aberrations of the wide-angle lens can be reduced, thereby ensuring the imaging quality of the wide-angle lens. Furthermore, by configuring one of the first to fifth lenses as a glass lens, the resolution of the wide-angle lens is further improved. Furthermore, glass lenses have little temperature drift under varying temperature conditions, which helps reduce the environmental sensitivity of the wide-angle lens.

[0066] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: n>1.7, where n represents the refractive index of the glass lens. n can 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 this relationship, the optical transfer function of the wide-angle lens can be optimized by using a glass lens with a higher refractive index, thereby further improving the lens's imaging resolution.

[0067] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: -160<f1 / sd1<-3; wherein f1 represents 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. By controlling the effective focal length of the first lens and the maximum effective semi-aperture of the object side of the first lens to satisfy the above relationship, the first lens can provide negative optical power for the lens, thereby facilitating light incident at a large angle to enter the lens and increasing the field of view of the lens; at the same time, by reasonably configuring the effective aperture of the object side of the first lens to fully compress the outer diameter of the first lens, it is beneficial to miniaturize the front end of the lens module, so that the lens has a small head structural feature. When f1 / sd1 is less than or equal to -160, the first lens cannot provide sufficient negative optical focal length for the lens, making it difficult to ensure wide-angle shooting effects. When f1 / sd1 is greater than or equal to -3, it is easy to cause the effective aperture of the first lens to be larger, which is not conducive to the realization of a small lens head.

[0068] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 80° ≤ FOV < 120°; where FOV represents the diagonal field of view of the wide-angle lens. FOV can be 80°, 85°, 90°, 95°, 100°, 103°, 106°, 109°, 112°, 113°, 114°, 116°, or 118°. Preferably, the wide-angle lens satisfies 100° ≤ FOV ≤ 110°. By controlling the diagonal field of view of the wide-angle lens to meet the above relationship, it is beneficial to expand the lens's shooting range and enhance the user's shooting experience.

[0069] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: |CT4 / R42| > 0.37, where CT4 represents the thickness of the fourth lens element along the optical axis, and R42 represents the radius of curvature of the image-side surface of the fourth lens element at the optical axis. |CT4 / R42| can 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. If this relationship is met, the thickness of the fourth lens element can be increased within a reasonable range to achieve a smoother surface profile, thereby facilitating lens processing and reducing ghosting.

[0070] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: CT2 > 0.55mm; where CT2 represents the thickness of the second lens on the optical axis. CT2 can 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 0.95mm. Satisfying this relationship improves the positive focal power of the second lens and, by adjusting the radius of curvature and shape of the object side of the second lens, allows light to better enter the wide-angle lens. It also helps ensure good image quality while shortening the overall lens length. However, when CT2 is less than or equal to 0.55mm, it cannot provide sufficient positive focal power for the wide-angle lens, making it difficult to focus light incident at large angles and ensuring image quality.

[0071] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 0.69 < f12 / f < 1.2; wherein f12 represents the combined focal length of the first lens and the second lens, and f represents the effective focal length of the wide-angle lens. f12 / f can 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. Satisfying the above relationship is beneficial for correcting aberrations and field curvature of the wide-angle lens, thereby enabling the lens to have better shooting performance. However, when f12 / f is less than or equal to 0.69, the effective focal length of the lens is long, which is not conducive to miniaturization of the lens. When f12 / f is greater than or equal to 1.2, it is not conducive to providing the lens with sufficient positive focal power to focus the light entering the lens into an image, and thus the image quality cannot be guaranteed.

[0072] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: TTL / ImgH < 1.85; where TTL represents the distance from the object-side surface of the first lens element to the imaging plane of the wide-angle lens on the optical axis. 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. By controlling the overall lens length and the half-image height on the imaging plane of the wide-angle lens to satisfy this relationship, the overall length of the wide-angle lens can be reduced while maintaining image quality, thereby achieving lens miniaturization.

[0073] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 0.9 < ET5 / CT5 < 2.3; where CT5 represents the thickness of the fifth lens element on the optical axis, and ET5 represents the thickness of the fifth lens element at its 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 satisfies 1.8 < ET5 / CT5 < 2.3. Under the condition that the above relationship is satisfied, the fifth lens element can provide negative optical power to the lens, thereby reasonably increasing the thickness of the fifth lens element at its effective aperture to better correct aberrations in the peripheral field of view, improve imaging quality in the peripheral field of view, and reduce ghosting caused by reflections from the lens edges. However, it should be noted that the thickness of the fifth lens element at its effective aperture cannot be too thick or too thin, that is, the above ratio cannot exceed the upper limit or fall below the lower limit. Otherwise, the overall thickness difference of the fifth lens element will be too large, which is not conducive to lens molding.

[0074] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: -11.1 < f5 / R52 < -2; where f5 represents the effective focal length of the fifth lens element, and R52 represents the radius of curvature of the image-side surface of the fifth lens element 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. When this relationship is satisfied, the fifth lens element can provide negative optical power to the lens. By properly configuring the convex surface of the image-side surface of the fifth lens element, field curvature can be further corrected. The optical back focus of the wide-angle lens can also be controlled within a reasonable range, giving the lens a telecentric characteristic. When f5 / R52 is greater than or equal to -2, the surface of the side of the fifth lens image will fluctuate too much, which is not conducive to lens processing; when f5 / R52 is less than or equal to -11.1, the fifth lens cannot provide sufficient negative optical power for the lens, which is not conducive to correcting the lens field curvature and it is also difficult to ensure the back focal length of the lens.

[0075] In an exemplary embodiment, all lenses except the glass lens are made of plastic. Plastic lenses can reduce the weight of the wide-angle lens and lower the production cost.

[0076] In an exemplary embodiment, the wide-angle lens further includes an infrared filter. The infrared filter is located on the image side of the fifth lens element and is used to filter incident light. Specifically, it is used to block infrared light and prevent it from being absorbed by the photosensitive element. This prevents infrared light from affecting the color and clarity of normal images, thereby improving the imaging quality of the wide-angle lens.

[0077] The wide-angle lens of the above-mentioned embodiment of the present application can use multiple lenses, such as the five lenses described above. By rationally allocating the focal length, optical power, surface shape, thickness of each lens, and the on-axis spacing between the lenses, it can be ensured that the above-mentioned wide-angle lens has a large field of view while having a small head, light weight, and high imaging quality. It also has a large aperture (FNO can be 2.0), thereby better meeting the application requirements of lightweight electronic devices such as mobile phones and tablets. However, those skilled in the art should understand that without departing from the technical solution claimed in this application, the number of lenses constituting the wide-angle lens can be changed to obtain the various results and advantages described in this specification.

[0078] Specific embodiments of wide-angle lenses applicable to the above-described embodiments are further described below with reference to the accompanying drawings. In the following embodiments, if a lens surface is convex and the position of the convex surface is undefined, it indicates that the lens surface is convex at least in the paraxial region; if a lens surface is concave and the position of the concave surface is undefined, it indicates that the lens surface is concave at least in the paraxial region. The paraxial region here refers to the area 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 imaging plane is called the image-side surface.

[0079] Example 1

[0080] The following reference Figures 1 to 2 A wide-angle lens 100 according to Embodiment 1 of the present application will be described.

[0081] Figure 1 FIG. 1 shows a schematic structural diagram of a wide-angle lens 100 according to Example 1. Figure 1 As shown, the wide-angle lens 100 includes, in order from the object side to the image side along the optical axis, a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 , a fifth lens L5 and an imaging surface S13 .

[0082] The first lens L1 has negative refractive power. Its object-side surface S1 and image-side surface S2 are both aspherical surfaces. 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.

[0083] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is convex at the optical axis and at the circumference, and the image-side surface S4 is convex at the optical axis and at the circumference.

[0084] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. 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.

[0085] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, 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.

[0086] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. 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.

[0087] Setting the object-side and image-side surfaces of the first to fifth lenses L1 to L5 to be aspherical is beneficial for correcting aberrations and solving the problem of image distortion. It also enables the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the wide-angle lens 100 miniaturized.

[0088] The material of the first lens L1 is set to be glass. Using a lens made of glass can make the wide-angle lens 100 have a small temperature drift under different temperature changes, thereby having better temperature tolerance; and make the wide-angle lens 100 have a better optical transfer function, which is conducive to improving the imaging resolution of the wide-angle lens 100.

[0089] A stop STO is also provided between the first lens L1 and the second lens L2 to limit the size of the incident light beam, thereby further improving the imaging quality of the wide-angle lens 100. The wide-angle lens 100 also includes a filter 110 provided on the image side of the fifth lens and having an object side surface S11 and an image side surface S12. Light from the object OBJ passes through each surface S1 to S12 in sequence and is finally imaged on the imaging surface S13. Furthermore, the filter 110 is an infrared filter, which is used to filter out infrared light from external light incident on the wide-angle lens 100 to avoid color distortion of the image. Specifically, the filter 110 is made of glass. The filter 110 may be a part of the wide-angle lens 100 and assembled together with each lens, or it may be installed together when the wide-angle lens 100 is assembled with the photosensitive element.

[0090] Table 1 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., dispersion coefficient), and effective focal length of the wide-angle lens 100 of Example 1, wherein the units of the radius of curvature, thickness, and effective focal length of the lens are all in millimeters (mm). The surface closest to the object in the lens is called the object side, and the surface closest to the imaging plane in the lens is called the image side. In addition, taking lens L1 as an example, the first value in the "Thickness" parameter column of lens L1 is the thickness of the lens on the optical axis, and the second value is the distance from the image side of the lens to the object side of the next lens in the image side direction on the optical axis; the value of aperture ST0 in the "Thickness" parameter column is the distance from aperture ST0 to the vertex of the object side of the next lens (the vertex refers to the intersection of the lens and the optical axis) on the optical axis. We assume that the direction from the object side of the first lens L1 to the image side of the last lens is the positive direction of the optical axis. When the value is negative, it indicates that aperture ST0 is set to the right of the vertex of the object side of the lens. If the thickness of aperture ST0 is positive, the aperture is to the left of the vertex of the object side of the lens.

[0091] Table 1

[0092]

[0093] The aspheric surface shape of each lens is defined by the following formula:

[0094]

[0095] Where x is the distance vector from the vertex of the aspheric surface at a height h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., paraxial curvature c is the reciprocal of the curvature radius R in Table 1); k is the conic coefficient; and Ai is the i-th order coefficient of the aspheric surface. Table 2 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspheric surfaces S1-S10 of the lens in Example 1.

[0096] Table 2

[0097]

[0098]

[0099] The half of the diagonal length ImgH of the effective pixel area on the imaging surface S13 of the wide-angle lens 100 of this embodiment is 2.28 mm. Combining the data in Table 1 and Table 2, it can be seen that the wide-angle lens 100 in Example 1 meets the following requirements:

[0100] sd1 / ImgH=0.339, where sd1 represents the maximum effective semi-aperture of the object-side surface S1 of the first lens element L1, and ImgH represents half the diagonal length of the effective pixel area on the imaging surface S13 of the wide-angle lens 100;

[0101] n=1.811, where n represents the refractive index of the glass lens. 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;

[0102] f1 / sd1=-4.09, where f1 represents the effective focal length of the first lens L1;

[0103] FOV=106.4°, where FOV represents the diagonal field of view of the wide-angle lens 100;

[0104] |CT4 / R42|=0.988, where CT4 represents the thickness of the fourth lens element L4 on the optical axis, and R42 represents the radius of curvature of the image-side surface S8 of the fourth lens element L4 on the optical axis;

[0105] CT2 = 0.718 mm, where CT2 represents the thickness of the second lens element L2 along the optical axis;

[0106] f12 / f=1.157, where f12 represents the combined focal length of the first lens L1 and the second lens L2, and f represents the effective focal length of the wide-angle lens 100;

[0107] TTL / ImgH=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;

[0108] ET5 / CT5=2.03, where CT5 represents the thickness of the fifth lens element L5 on the optical axis, and ET5 represents the thickness of the fifth lens element L5 at its maximum effective aperture;

[0109] f5 / R52=−3.858, where f5 represents the effective focal length of the fifth lens element L5 , and R52 represents the radius of curvature of the image-side surface S10 of the fifth lens element L5 at the optical axis.

[0110] Figure 2 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the wide-angle lens 100 of Example 1 are shown respectively. The reference wavelength of the wide-angle lens 100 is 555nm. The longitudinal spherical aberration curve shows the deviation of the focal point of light with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the wide-angle lens 100; the astigmatism curve shows the meridional image curvature and sagittal image curvature of light with a wavelength of 555nm after passing through the wide-angle lens 100; the distortion curve shows the distortion rate of light with a wavelength of 555nm at different image heights after passing through the wide-angle lens 100. Figure 2 It can be seen that the wide-angle lens 100 provided in Example 1 can achieve good imaging quality.

[0111] Example 2

[0112] The following reference Figures 3 and 4 The wide-angle lens 100 according to Embodiment 2 of the present application will be described. In this embodiment, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 3 FIG. 1 shows a schematic structural diagram of a wide-angle lens 100 according to Embodiment 2 of the present application.

[0113] like Figure 3 As shown, the wide-angle lens 100 includes, in order from the object side to the image side along the optical axis, a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 , a fifth lens L5 and an imaging surface S13 .

[0114] The first lens L1 has negative refractive power. Its object-side surface S1 and image-side surface S2 are both aspherical surfaces. 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.

[0115] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is convex at the optical axis and at the circumference, and the image-side surface S4 is convex at the optical axis and at the circumference.

[0116] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. 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.

[0117] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, 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.

[0118] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. 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.

[0119] Setting the object-side and image-side surfaces of the first to fifth lenses L1 to L5 to be aspherical is beneficial for correcting aberrations and solving the problem of image distortion. It also enables the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the wide-angle lens 100 miniaturized.

[0120] The material of the third lens L3 is set to be glass. Using a lens made of glass can make the wide-angle lens 100 have a small temperature drift under different temperature changes, thereby having better temperature tolerance; and make the wide-angle lens 100 have a better optical transfer function, which is conducive to improving the imaging resolution of the wide-angle lens 100.

[0121] A stop STO is also provided between the first lens L1 and the second lens L2 to limit the size of the incident light beam, further improving the imaging quality of the wide-angle lens 100. The wide-angle lens 100 also 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 an object OBJ sequentially passes through surfaces S1 to S12 and is ultimately imaged on an imaging surface S13. Furthermore, the filter 110 is an infrared filter, which is used to remove infrared light from external light incident on the wide-angle lens 100 to prevent color distortion in the image.

[0122] Table 3 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., Abbe coefficient), and effective focal length of each lens of the wide-angle lens 100 of Example 2, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 4 shows the higher-order coefficients of the aspheric surfaces S1-S10 of the lenses that can be used in Example 2, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 5 shows the relevant parameter values ​​of the wide-angle lens 100 given in Example 2.

[0123] Table 3

[0124]

[0125] Table 4

[0126]

[0127]

[0128] Table 5

[0129]

[0130] Figure 4 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the wide-angle lens 100 of Example 2 are shown respectively. The reference wavelength of the wide-angle lens 100 is 555nm. The longitudinal spherical aberration curve shows the deviation of the focal point of light with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the wide-angle lens 100; the astigmatism curve shows the meridional image curvature and sagittal image curvature of light with a wavelength of 555nm after passing through the wide-angle lens 100; the distortion curve shows the distortion rate of light with a wavelength of 555nm at different image heights after passing through the wide-angle lens 100. According to Figure 4 It can be seen that the wide-angle lens 100 provided in Example 2 can achieve good imaging quality.

[0131] Example 3

[0132] The following reference Figures 5 and 6 The wide-angle lens 100 according to Embodiment 3 of the present application will be described. In this embodiment, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 5 FIG. 1 shows a schematic structural diagram of a wide-angle lens 100 according to Example 3 of the present application.

[0133] like Figure 5 As shown, the wide-angle lens 100 includes, in order from the object side to the image side along the optical axis, a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 , a fifth lens L5 and an imaging surface S13 .

[0134] The first lens L1 has negative refractive power. Its object-side surface S1 and image-side surface S2 are both aspherical surfaces. 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.

[0135] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is convex at the optical axis and at the circumference, and the image-side surface S4 is convex at the optical axis and at the circumference.

[0136] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. 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.

[0137] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, 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.

[0138] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. 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.

[0139] Setting the object-side and image-side surfaces of the first to fifth lenses L1 to L5 to be aspherical is beneficial for correcting aberrations and solving the problem of image distortion. It also enables the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the wide-angle lens 100 miniaturized.

[0140] The material of the first lens L1 is set to be glass. Using a lens made of glass can make the wide-angle lens 100 have a small temperature drift under different temperature changes, thereby having better temperature tolerance; and make the wide-angle lens 100 have a better optical transfer function, which is conducive to improving the imaging resolution of the wide-angle lens 100.

[0141] A stop STO is also provided between the first lens L1 and the second lens L2 to limit the size of the incident light beam, further improving the imaging quality of the wide-angle lens 100. The wide-angle lens 100 also 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 an object OBJ sequentially passes through surfaces S1 to S12 and is ultimately imaged on an imaging surface S13. Furthermore, the filter 110 is an infrared filter, which is used to remove infrared light from external light incident on the wide-angle lens 100 to prevent color distortion in the image.

[0142] Table 6 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., Abbe coefficient), and effective focal length of each lens in the wide-angle lens 100 of Example 3. The units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 7 shows the higher-order coefficients of the aspheric surfaces S1-S10 that can be used in Example 3. The aspheric surface shape can be defined by formula (1) given in Example 1. Table 8 shows the relevant parameter values ​​of the wide-angle lens 100 given in Example 3.

[0143] Table 6

[0144]

[0145]

[0146] Table 7

[0147]

[0148] Table 8

[0149]

[0150]

[0151] Figure 6 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the wide-angle lens 100 of Example 3 are shown respectively. The reference wavelength of the wide-angle lens 100 is 555nm. The longitudinal spherical aberration curve shows the deviation of the focal point of light with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the wide-angle lens 100; the astigmatism curve shows the meridional image curvature and sagittal image curvature of light with a wavelength of 555nm after passing through the wide-angle lens 100; the distortion curve shows the distortion rate of light with a wavelength of 555nm at different image heights after passing through the wide-angle lens 100. Figure 6 It can be seen that the wide-angle lens 100 provided in Example 3 can achieve good imaging quality.

[0152] Example 4

[0153] The following reference Figures 7 and 8 The wide-angle lens 100 according to Embodiment 4 of the present application will be described. In this embodiment, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 7 FIG. 4 shows a schematic structural diagram of a wide-angle lens 100 according to Example 4 of the present application.

[0154] like Figure 7 As shown, the wide-angle lens 100 includes, in order from the object side to the image side along the optical axis, a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 , a fifth lens L5 and an imaging surface S13 .

[0155] The first lens L1 has negative refractive power. Its object-side surface S1 and image-side surface S2 are both aspherical surfaces. 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.

[0156] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. 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.

[0157] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. 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.

[0158] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, 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.

[0159] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. 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.

[0160] Setting the object-side and image-side surfaces of the first to fifth lenses L1 to L5 to be aspherical is beneficial for correcting aberrations and solving the problem of image distortion. It also enables the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the wide-angle lens 100 miniaturized.

[0161] The second lens L2 is made of glass. Using a glass lens can minimize temperature drift of the wide-angle lens 100 under varying temperature conditions, thereby providing better temperature tolerance. It also enables the wide-angle lens 100 to have a better optical transfer function, thereby improving the imaging resolution of the wide-angle lens 100.

[0162] A stop STO is also provided between the first lens L1 and the second lens L2 to limit the size of the incident light beam, further improving the imaging quality of the wide-angle lens 100. The wide-angle lens 100 also 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 an object OBJ sequentially passes through surfaces S1 to S12 and is ultimately imaged on an imaging surface S13. Furthermore, the filter 110 is an infrared filter, which is used to remove infrared light from external light incident on the wide-angle lens 100 to prevent color distortion in the image.

[0163] Table 9 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., Abbe coefficient), and effective focal length of each lens in the wide-angle lens 100 of Example 4. The units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 10 shows the higher-order coefficients of the aspheric surfaces S1-S10 that can be used in Example 4. The aspheric surface shape can be defined by formula (1) given in Example 1. Table 11 shows the relevant parameter values ​​of the wide-angle lens 100 given in Example 4.

[0164] Table 9

[0165]

[0166] Table 10

[0167]

[0168]

[0169] Table 11

[0170]

[0171] Figure 8 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the wide-angle lens 100 of Example 4 are shown respectively. The reference wavelength of the wide-angle lens 100 is 555nm. The longitudinal spherical aberration curve shows the deviation of the focal point of light with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the wide-angle lens 100; the astigmatism curve shows the meridional image curvature and sagittal image curvature of light with a wavelength of 555nm after passing through the wide-angle lens 100; and the distortion curve shows the distortion rate of light with a wavelength of 555nm at different image heights after passing through the wide-angle lens 100. Figure 8 It can be seen that the wide-angle lens 100 provided in Example 4 can achieve good imaging quality.

[0172] Example 5

[0173] The following reference Figures 9 and 10 The wide-angle lens 100 according to Embodiment 5 of the present application will be described. In this embodiment, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figure 9 FIG. 1 shows a schematic structural diagram of a wide-angle lens 100 according to Example 5 of the present application.

[0174] like Figure 9 As shown, the wide-angle lens 100 includes, in order from the object side to the image side along the optical axis, a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 , a fifth lens L5 and an imaging surface S13 .

[0175] The first lens L1 has negative refractive power. Its object-side surface S1 and image-side surface S2 are both aspherical surfaces. 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.

[0176] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is convex at the optical axis and at the circumference, and the image-side surface S4 is convex at the optical axis and at the circumference.

[0177] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. 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.

[0178] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, 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.

[0179] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. 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.

[0180] Setting the object-side and image-side surfaces of the first to fifth lenses L1 to L5 to be aspherical is beneficial for correcting aberrations and solving the problem of image distortion. It also enables the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the wide-angle lens 100 miniaturized.

[0181] The material of the first lens L1 is set to be glass. Using a lens made of glass can make the wide-angle lens 100 have a small temperature drift under different temperature changes, thereby having better temperature tolerance; and make the wide-angle lens 100 have a better optical transfer function, which is conducive to improving the imaging resolution of the wide-angle lens 100.

[0182] A stop STO is also provided between the first lens L1 and the second lens L2 to limit the size of the incident light beam, further improving the imaging quality of the wide-angle lens 100. The wide-angle lens 100 also 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 an object OBJ sequentially passes through surfaces S1 to S12 and is ultimately imaged on an imaging surface S13. Furthermore, the filter 110 is an infrared filter, which is used to remove infrared light from external light incident on the wide-angle lens 100 to prevent color distortion in the image.

[0183] Table 12 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., Abbe coefficient), and effective focal length of each lens in the wide-angle lens 100 of Example 5. The units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 13 shows the higher-order coefficients of the aspheric surfaces S1-S10 that can be used in Example 5. The aspheric surface shape can be defined by formula (1) given in Example 1. Table 14 shows the relevant parameter values ​​of the wide-angle lens 100 given in Example 5.

[0184] Table 12

[0185]

[0186] Table 13

[0187]

[0188] Table 14

[0189]

[0190] Figure 10 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the wide-angle lens 100 of Example 5 are shown respectively. The reference wavelength of the wide-angle lens 100 is 587.56nm. The longitudinal spherical aberration curve shows the deviation of the focal point of light with wavelengths of 486.13nm, 587.56nm, and 656.27nm after passing through the wide-angle lens 100; the astigmatism curve shows the meridional image curvature and sagittal image curvature of light with a wavelength of 587.56nm after passing through the wide-angle lens 100; the distortion curve shows the distortion rate of light with a wavelength of 587.56nm at different image heights after passing through the wide-angle lens 100. Figure 10 It can be seen that the wide-angle lens 100 provided in Example 5 can achieve good imaging quality.

[0191] Example 6

[0192] The following reference Figures 11 to 12 The wide-angle lens 100 according to Example 6 of the present application will be described. In this embodiment, for the sake of brevity, some descriptions similar to those in Example 1 will be omitted. Figure 11 FIG. 1 shows a schematic structural diagram of a wide-angle lens 100 according to Example 6 of the present application.

[0193] like Figure 11 As shown, the wide-angle lens 100 includes, in order from the object side to the image side along the optical axis, a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 , a fifth lens L5 and an imaging surface S13 .

[0194] The first lens L1 has negative refractive power. Its object-side surface S1 and image-side surface S2 are both aspherical surfaces. 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.

[0195] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is convex at the optical axis and at the circumference, and the image-side surface S4 is convex at the optical axis and at the circumference.

[0196] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. 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.

[0197] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, 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.

[0198] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. 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.

[0199] Setting the object-side and image-side surfaces of the first to fifth lenses L1 to L5 to be aspherical is beneficial for correcting aberrations and solving the problem of image distortion. It also enables the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the wide-angle lens 100 miniaturized.

[0200] The material of the first lens L1 is set to be glass. Using a lens made of glass can make the wide-angle lens 100 have a small temperature drift under different temperature changes, thereby having better temperature tolerance; and make the wide-angle lens 100 have a better optical transfer function, which is conducive to improving the imaging resolution of the wide-angle lens 100.

[0201] A stop STO is also provided between the first lens L1 and the second lens L2 to limit the size of the incident light beam, further improving the imaging quality of the wide-angle lens 100. The wide-angle lens 100 also 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 an object OBJ sequentially passes through surfaces S1 to S12 and is ultimately imaged on an imaging surface S13. Furthermore, the filter 110 is an infrared filter, which is used to remove infrared light from external light incident on the wide-angle lens 100 to prevent color distortion in the image.

[0202] Table 15 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., Abbe coefficient), and effective focal length of each lens in the wide-angle lens 100 of Example 6. The units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 16 shows the higher-order coefficients of the aspheric surfaces S1-S10 that can be used in Example 6. The aspheric surface shape can be defined by formula (1) given in Example 1. Table 17 shows the relevant parameter values ​​of the wide-angle lens 100 given in Example 6.

[0203] Table 15

[0204]

[0205] Table 16

[0206]

[0207]

[0208] Table 17

[0209]

[0210] Figure 12 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the wide-angle lens 100 of Example 6 are shown respectively. The reference wavelength of the wide-angle lens 100 is 587.56nm. The longitudinal spherical aberration curve shows the deviation of the focal point of light with wavelengths of 486.13nm, 587.56nm, and 656.27nm after passing through the wide-angle lens 100; the astigmatism curve shows the meridional image curvature and sagittal image curvature of light with a wavelength of 587.56nm after passing through the wide-angle lens 100; the distortion curve shows the distortion rate of light with a wavelength of 587.56nm at different image heights after passing through the wide-angle lens 100. Figure 12 It can be seen that the wide-angle lens 100 provided in Example 6 can achieve good imaging quality.

[0211] Example 7

[0212] The following reference Figures 13 and 14 The wide-angle lens 100 according to Example 7 of the present application will be described. In this embodiment, for the sake of brevity, some descriptions similar to those in Example 1 will be omitted. Figure 13 FIG. 1 shows a schematic structural diagram of a wide-angle lens 100 according to Example 7 of the present application.

[0213] like Figure 11 As shown, the wide-angle lens 100 includes, in order from the object side to the image side along the optical axis, a first lens L1 , a second lens L2 , a third lens L3 , a fourth lens L4 , a fifth lens L5 and an imaging surface S13 .

[0214] The first lens L1 has negative refractive power. Its object-side surface S1 and image-side surface S2 are both aspherical surfaces. 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.

[0215] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is convex at the optical axis and at the circumference, and the image-side surface S4 is convex at the optical axis and at the circumference.

[0216] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. 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.

[0217] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, 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.

[0218] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. 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.

[0219] Setting the object-side and image-side surfaces of the first to fifth lenses L1 to L5 to be aspherical is beneficial for correcting aberrations and solving the problem of image distortion. It also enables the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the wide-angle lens 100 miniaturized.

[0220] The material of the first lens L1 is set to be glass. Using a lens made of glass can make the wide-angle lens 100 have a small temperature drift under different temperature changes, thereby having better temperature tolerance; and make the wide-angle lens 100 have a better optical transfer function, which is conducive to improving the imaging resolution of the wide-angle lens 100.

[0221] A stop STO is also provided between the first lens L1 and the second lens L2 to limit the size of the incident light beam, further improving the imaging quality of the wide-angle lens 100. The wide-angle lens 100 also 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 an object OBJ sequentially passes through surfaces S1 to S12 and is ultimately imaged on an imaging surface S13. Furthermore, the filter 110 is an infrared filter, which is used to remove infrared light from external light incident on the wide-angle lens 100 to prevent color distortion in the image.

[0222] Table 18 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., Abbe coefficient), and effective focal length of each lens of the wide-angle lens 100 of Example 7. The units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 19 shows the higher-order coefficients of the aspheric surfaces S1-S10 of the lenses in Example 7, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 20 shows the numerical values ​​of the relevant parameters of the wide-angle lens 100 given in Example 7.

[0223] Table 18

[0224]

[0225] Table 19

[0226]

[0227]

[0228] Table 20

[0229]

[0230] Figure 14 The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the wide-angle lens 100 of Example 7 are shown respectively. The reference wavelength of the wide-angle lens 100 is 555nm. The longitudinal spherical aberration curve shows the deviation of the focal point of light with wavelengths of 470nm, 510nm, 555nm, 610nm, and 650nm after passing through the wide-angle lens 100; the astigmatism curve shows the meridional image curvature and sagittal image curvature of light with a wavelength of 555nm after passing through the wide-angle lens 100; and the distortion curve shows the distortion rate of light with a wavelength of 555nm at different image heights after passing through the wide-angle lens 100. Figure 14 It can be seen that the wide-angle lens 100 provided in Example 7 can achieve good imaging quality.

[0231] like Figure 15 As shown, the present application further provides an imaging device 200, comprising the wide-angle lens 100 as described above; and a photosensitive element 210, wherein the photosensitive element 210 is disposed on the image side of the wide-angle lens 100, and the photosensitive surface of the photosensitive element 210 coincides with the imaging surface S13. Specifically, the photosensitive element 210 can be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD) image sensor.

[0232] The imaging device 200 utilizes the wide-angle lens 100 to capture images with minimal aberration and high resolution while maintaining a wide viewing angle. Furthermore, the imaging device 200 has a small head, making it easily adaptable to devices with limited dimensions, such as thin and light electronic devices. Specifically, it can be used as a mobile phone camera, a car camera, a surveillance camera, or an endoscope.

[0233] like Figure 16As shown, the present application further provides an electronic device 300, comprising a housing 310 and the imaging device 200 as described above, wherein the imaging device 200 is mounted on the housing 310. Specifically, the imaging device 200 is disposed within the housing 310 and exposed from the housing 310 to capture images. The housing 310 can provide the imaging device 200 with protection such as dustproofing, waterproofing, and drop resistance. The housing 310 is provided with a hole corresponding to the imaging device 200 to allow light to enter or exit the housing through the hole.

[0234] The electronic device 300 has a lightweight structure. By using the imaging device 200 described above, images with a wide viewing angle and good imaging quality can be captured, meeting the shooting requirements of cameras in mobile phones, vehicles, surveillance equipment, medical equipment, and the like.

[0235] In some other embodiments, the “electronic device” used may also include, but is not limited to, a device configured to receive or send communication signals via a wired line connection and / or via a wireless interface. An electronic device configured to communicate via a wireless interface may be referred to as a “wireless communication terminal,” “wireless terminal,” or “mobile terminal.” Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that can combine cellular radiotelephones with data processing, fax, and data communication capabilities; personal digital assistants (PDAs) that can 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 radiotelephone transceivers.

[0236] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0237] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A wide-angle lens, characterized in that: There are five lenses with refractive power. The wide-angle lens includes the following elements in order from the object side to the image side along the optical axis: a first lens having negative optical power, wherein the image-side surface of the first lens is concave at the optical axis; a second lens having positive refractive power, wherein the object-side surface of the second lens is convex at the optical axis, and the image-side surface of the second lens is convex at the optical axis; a third lens having negative optical power, wherein the object-side surface of the third lens is convex at the optical axis and the image-side surface of the third lens is concave at the optical axis; a fourth lens having positive refractive power, wherein the object-side surface of the fourth lens is concave at the optical axis, and the image-side surface of the fourth lens is convex at the optical axis; a fifth lens having negative optical power, wherein the object-side surface of the fifth lens is convex at the optical axis, the image-side surface of the fifth lens is concave at the optical axis, and at least one of the object-side surface and the image-side surface includes at least one inflection point; and an aperture, the aperture being disposed between the first lens and the second lens; One of the first to fifth lenses is a glass lens, and the wide-angle lens satisfies the following relationship: 0.305≤sd1 / ImgH<0.36; 105.2°≤FOV<120°; 0.69<f12 / f<1.2; Wherein, sd1 represents the maximum effective semi-aperture of the object side of the first lens, ImgH is half the diagonal length of the effective pixel area on the imaging surface of the wide-angle lens, FOV represents the diagonal field of view of the wide-angle lens, f12 represents the combined focal length of the first lens and the second lens, and f represents the effective focal length of the wide-angle lens.

2. The wide-angle lens according to claim 1, wherein: The wide-angle lens satisfies the following relationship: n＞1.7； Wherein, n represents the refractive index of the glass lens.

3. The wide-angle lens according to claim 1, wherein: The wide-angle lens satisfies the following relationship: -9.25≤f1 / sd1<-3; Wherein, f1 represents the effective focal length of the first lens.

4. The wide-angle lens according to claim 1, wherein: The wide-angle lens satisfies the following relationship: 1.113≥|CT4 / R42|>0.37; Wherein, CT4 represents the thickness of the fourth lens on the optical axis, and R42 represents the curvature radius of the image side surface of the fourth lens at the optical axis.

5. The wide-angle lens according to 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.

6. The wide-angle lens according to claim 1, wherein: The wide-angle lens satisfies the following relationship: 0.801<f12 / f<1.

2.

7. The wide-angle lens according to claim 1, wherein: The wide-angle lens satisfies the following relationship: 1.565≤TTL / ImgH<1.85; Wherein, TTL represents the distance from the object side surface of the first lens to the imaging surface of the wide-angle lens on the optical axis.

8. The wide-angle lens according to 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.

9. The wide-angle lens according to claim 1, wherein: The wide-angle lens satisfies the following relationship: -11.1<f5 / R52<-2; Wherein, f5 represents the effective focal length of the fifth lens element, and R52 represents the radius of curvature of the image side surface of the fifth lens element at the optical axis.

10. An imaging device, characterized in that: The invention comprises the wide-angle lens according to any one of claims 1 to 9 and a photosensitive element, wherein the photosensitive element is arranged on the image side of the wide-angle lens.

11. An electronic device, characterized in that: The invention comprises a housing and the imaging device according to claim 10, wherein the imaging device is mounted on the housing.

Images