CN110737072A - An optical lens and electronic equipment - Google Patents

Abstract

The present application discloses an optical lens, comprising at least an aperture, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a third lens with positive refractive power along an optical axis from the object side to the image side. The fourth lens with negative refractive power; the effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy the following relationship: ∣f/f2∣﹤0.60. The application also discloses an electronic device.

Description

An optical lens and electronic equipment

technical field

The present application relates to the field of optical components, and in particular, to an optical lens and electronic equipment.

Background technique

With the wide application of electronic equipment, the requirements for the imaging function of the electronic equipment are also higher and higher; therefore, an optical lens capable of clearly photographing objects at close distances (eg, a distance of the order of centimeters) is required.

SUMMARY OF THE INVENTION

Embodiments of the present application provide an optical lens and an electronic device, which can clearly photograph objects at a close distance (eg, a distance in the order of centimeters).

The technical solutions of the embodiments of the present application are implemented as follows:

The embodiment of the present application provides an optical lens, which includes at least from the object side to the image side along the optical axis:

an aperture, a first lens with positive power, a second lens with negative power, a third lens with positive power, and a fourth lens with negative power;

The effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy the following relationship: ∣f/f2∣﹤0.60.

In the above solution, the entrance pupil diameter EPD of the optical lens and the effective half-diameter DTg of the aperture at the object side of the aperture satisfy the following relationship: EPD/DTg>1.6.

In the above solution, the height H1 of the object and the image height H2 of the object after passing through the optical lens satisfy the following relationship: 0.1﹤H2/H1﹤0.2.

In the above solution, the half-diagonal length ImgH of the effective pixel area on the imaging surface of the optical lens and the effective focal length f of the optical lens satisfy the following relationship: 0.5﹤ImgH/f﹤1.1.

In the above solution, the curvature radius R1 of the object side surface of the first lens and the effective focal length f1 of the first lens satisfy the following relationship: 0.3﹤R1/f1﹤1.2.

In the above solution, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the object side of the first lens to the optical lens The distance TTL of the imaging plane on the optical axis satisfies the following relationship: 0.9﹤(CT1+CT2)/TTL*5﹤1.5.

In the above solution, the entrance pupil diameter EPD of the optical lens and the half-diagonal length ImgH of the effective pixel area on the imaging plane of the optical lens satisfy the following relationship: 0.4﹤EPD/ImgH﹤0.8.

In the above solution, the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the optical lens and the half-diagonal length ImgH of the effective pixel area on the imaging surface of the optical lens satisfy the following relationship: : TTL/ImgH≤2.0.

In the above solution, along the optical axis from the object side to the image side, after the fourth lens, the optical lens further includes: a fifth lens.

An embodiment of the present application further provides an electronic device, where the electronic device includes an optical lens and an image sensor, and the optical lens is the above-mentioned optical lens.

The optical lens and electronic device provided by the embodiments of the present application include at least an aperture, a first lens with positive refractive power, a second lens with negative refractive power, and a third lens with positive refractive power from the object side to the image side along the optical axis. , and a fourth lens with negative refractive power; the effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy the following relationship: ∣f/f2∣﹤0.60. By using the optical lens and the electronic device provided by the embodiments of the present application, it is possible to clearly photograph an object at a close distance (on the order of centimeters), for example, an object with an object distance of 3 centimeters can be clearly photographed.

Description of drawings

1 is a schematic diagram of the application for setting an external optical lens outside an electronic device;

2 is a schematic diagram of an optional structure of an optical lens according to an embodiment of the present application;

3 is a schematic diagram of another optional structure of an optical lens according to an embodiment of the present application;

4 is a schematic diagram of the light path in the optical lens when the imaging object distance of the optical lens is 3 cm according to an embodiment of the present application;

FIG. 5 is a schematic diagram 1 of the optical performance of an optical lens according to an optional embodiment of the present application;

FIG. 6 is a second schematic diagram of the optical performance of an optical lens according to an optional embodiment of the present application;

FIG. 7 is a schematic diagram 3 of the optical performance of an optical lens according to an optional embodiment of the present application.

Detailed ways

The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

Existing electronic equipment is limited by the physical size of the module (for example, the thickness of the electronic equipment), and the design space of the optical lens inside the electronic equipment is very limited, which easily causes the optical lens of the electronic equipment to be unable to shoot objects with a distance of less than 3cm. Focusing, it is impossible to clearly image objects with an object distance of the order of millimeters.

In order to be able to clearly photograph objects with an object distance of the order of millimeters, a solution is proposed in the related art by arranging an external optical lens outside the electronic device: the external optical lens is attached to the surface of the main camera lens of the electronic device. To achieve shooting, as shown in Figure 1. However, using an external optical lens to solve the super macro shooting solution will inevitably increase the thickness of the electronic device, affecting the overall appearance and user experience of the electronic device, and the installation, fixation and removal of the external optical lens is inconvenient. , the independent setting of the external optical lens will also increase the cost.

An embodiment of the present application provides an optical lens. An optional structural schematic diagram of the optical lens, as shown in FIG. 2, along the optical axis of the optical lens, from the object side to the image side at least includes: an aperture 10, a positive The first lens 11 of refractive power, the second lens 12 of negative refractive power, the third lens 13 of positive refractive power, and the fourth lens 14 of negative refractive power.

In some embodiments, the first lens 11 has an object side 1 and an image side 2, and both the object side 1 and the image side 2 are convex. The second lens 12 has an object side 3 and an image side 4, and the object side 3 is concave. The third lens 13 has an object side 5 and an image side 6, the object side 5 is concave, and the image side 6 is convex. The fourth lens 14 has an object side 7 and an image side 8, the object side 7 is convex, and the image side 8 is concave.

In some embodiments, the entrance pupil diameter EPD of the optical lens and the effective half-diameter DTg of the aperture 10 at the object side of the aperture 10 satisfy the following relationship: EPD/DTg>1.6; for example: EPD/DTg= 2.0.

In some embodiments, the effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy the following relationship: ∣f/f2∣﹤0.60; for example, f/f2=-0.5, or f/f2=0.4 .

In some embodiments, the height H1 of the object and the image height H2 of the object after passing through the optical lens satisfy the following relationship: 0.1﹤H2/H1﹤0.2; that is, the magnification ratio of the image of the object after passing through the optical lens 0.10 to 0.20 times. In a specific implementation, the magnification ratio can be calculated by calculating the ratio of the height of the image to the height of the object.

In some embodiments, the half-diagonal length ImgH of the effective pixel area on the imaging surface of the optical lens and the effective focal length f of the optical lens satisfy the following relationship: 0.5﹤ImgH/f﹤1.1; for example, ImgH/f = 0.8.

In some embodiments, the curvature radius R1 of the object side surface 1 of the first lens 11 and the effective focal length f1 of the first lens 11 satisfy the following relationship: 0.3﹤R1/f1﹤1.2; for example, R1/f1=0.8.

In some embodiments, the center thickness CT1 of the first lens 11 on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the object side of the first lens to the The distance TTL of the imaging surface of the optical lens on the optical axis satisfies the following relationship:

0.9﹤(CT1+CT2)/TTL*5﹤1.5.

In some embodiments, the entrance pupil diameter EPD of the optical lens and the half-diagonal length ImgH of the effective pixel area on the imaging plane of the optical lens satisfy the following relationship: 0.4﹤EPD/ImgH﹤0.8.

In some embodiments, the distance from the object side 1 of the first lens 11 to the imaging surface of the optical lens on the optical axis is TTL and the half-diagonal length of the effective pixel area on the imaging surface of the optical lens ImgH satisfies the following relationship: TTL/ImgH≤2.0.

In some embodiments, another optional structural schematic diagram of the optical lens, as shown in FIG. 3 , in addition to the above components, is along the optical axis from the object side to the image side, after the fourth lens 14 , the optical lens further includes: a fifth lens 15 . The fifth lens 15 has an object side 9 and an image side 10; the fifth lens 15 may be a filter, or the fifth lens may be a glass sheet.

In the embodiment of this application, the basic parameter table of the optical lens is shown in Table 1 below:

Table 1

Among them, the radius of curvature in Table 1 refers to the radius of curvature at the intersection of the optical axis and the side surface of the object or the side surface of the image. The distance -0.101 mm in Table 1 refers to the distance between the aperture 10 and the vertex of the object side surface 1 of the first lens 11 on the optical axis. The distance 0.627 mm in Table 1 refers to the distance between the vertex of the object side 1 of the first lens 11 and the vertex of the image side 2 of the first lens 11 . The distance 0.041 mm in Table 1 refers to the distance between the vertex of the image side 2 of the first lens 11 and the vertex of the object side 3 of the second lens 12 on the optical axis. By analogy, the distance 0.213 mm in Table 1 refers to the distance between the vertex of the object side 3 of the second lens 12 and the vertex of the image side 4 of the second lens on the optical axis. 0.390 in Table 1 refers to the distance between the vertex of the image side 4 of the second lens 12 and the vertex of the object side 5 of the third lens 13 on the optical axis. 0.827 mm in Table 1 refers to the distance between the vertex of the object side 5 of the third lens 13 and the vertex of the image side 6 of the third lens 13 on the optical axis. 0.040 mm in Table 1 refers to the distance between the vertex of the image side 6 of the third lens 13 and the vertex of the object side 7 of the fourth lens 14 on the optical axis. 0.280 mm in Table 1 refers to the distance between the vertex of the object side 7 of the fourth lens 14 and the vertex of the image side 8 of the fourth lens 14 on the optical axis. 0.553 mm in Table 1 refers to the distance between the vertex of the image side 8 of the fourth lens 14 and the vertex of the object side 9 of the fifth lens 15 on the optical axis. 0.210 in Table 1 refers to the distance between the vertex of the object side 9 of the fifth lens 15 and the vertex of the image side 10 of the fifth lens 15 on the optical axis. 0.269mm in Table 1 refers to the distance on the optical axis between the vertex of the image side 10 of the fifth lens 15 and the image of the object.

In some embodiments of the present application, the object side surface and the image side surface of the first lens 11 , the second lens 12 , the third lens 13 and the fourth lens 14 are all aspherical surfaces, and the surface shapes of the aspherical surfaces satisfy the following formula:

Among them, z is the depth of the aspheric surface, that is, the distance between any point on the aspheric surface and the tangent plane perpendicular to the optical axis and passing through the vertex of the aspheric surface; c=1/r, r is the radius of curvature of the surface, h is the point on the aspheric surface and The distance of the optical axis, k is the cone coefficient, A is the fourth-order coefficient, B is the sixth-order coefficient, C is the eighth-order coefficient, D is the tenth-order coefficient, E is the twelfth-order coefficient, and F is the first-order coefficient. Fourteenth-order coefficient, G is the sixteenth-order coefficient. The parameters of each aspheric surface are shown in Table 2 below:

Table 2

The effective focal length f of an optical lens based on Fig. 2, Table 1 and Table 2 is 2.45mm, and the distance TTL on the optical axis from the object side of the first lens to the imaging plane of the optical lens is 3.45mm, The field of view (FOV) above the maximum image height is 77.6 degrees, and the aperture value (f-number) is 2.55.

In an optional embodiment of the present application, when the imaging object distance of the optical lens is 3 cm, the light path in the optical lens, as shown in FIG. 4 , passes through the aperture 10, the first lens 11, the second lens 12, The third mirror 13 , the fourth mirror 14 , and the fifth mirror 15 are post-imaged.

Schematic diagram 1 of the optical performance of an optical lens according to an optional embodiment of the present application, as shown in FIG. 5 , is a schematic diagram of the resolving power of the optical lens, wherein the resolving power is the line pairs that the optical lens can resolve per millimeter.

Schematic diagram 2 of the optical performance of the optical lens according to an optional embodiment of the present application, as shown in FIG. 6 , is a schematic diagram of the lateral chromatic aberration of imaging; the lateral chromatic aberration of light with different wavelengths is based on light with a wavelength of 555 nm.

Schematic diagram 3 of the optical performance of an optical lens according to an optional embodiment of the present application, as shown in FIG. 7 , is a schematic diagram of a distortion curve of imaging. The optical lens provided by the embodiment of the present application is located inside the electronic device, and the camera provided by the embodiment of the present application or the electronic device including the camera provided by the embodiment of the present application can clearly photograph close-range objects, for example, the object distance is on the order of millimeters Specifically, an object with an object distance of 3 cm can be clearly photographed; and, according to the schematic diagrams of optical performance shown in FIG. 5, FIG. 6 and FIG. 7, it can be known that the optical lens provided by the embodiment of the present application can achieve good imaging quality .

An embodiment of the present application further provides an electronic device, where the electronic device includes an optical lens and an image sensor, wherein the optical lens is the optical lens provided by the above embodiments.

It should be noted that, in the embodiments of the present application, expressions such as first, second, and third are only used to distinguish one feature from another feature, or to distinguish different elements in the same type of elements, but not to distinguish one feature from another. Indicates any limitation on a feature or element. Therefore, without departing from the teachings of the present application, the first lens in the embodiments of the present application may also be referred to as the seventh lens, the eighth lens, or the like.

The present application is an example for ease of illustration and explanation, and the size, thickness and shape of each lens may be exaggerated. That is, the shapes of the spherical or aspherical surfaces shown in the drawings are all shown by way of example, therefore, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces described in the drawings; the drawings are only examples , not drawn strictly to scale.

In the embodiments of the present application, when the terms "include", "include", "have", "include" and "include" are used in the specification of the present application, it means that the stated features, elements, and components exist, but The presence or addition of one or more other features, elements, components and/or combinations between them is not excluded. Furthermore, the term "comprising at least" when used in the specification of this application means that other features or elements may be included in addition to the stated at least included features or elements.

In the embodiments of the present application, the surface of each lens closest to the object to be photographed is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. An optical lens, characterized in that, from the object side to the image side along the optical axis at least comprising: an aperture, a first lens with positive power, a second lens with negative power, a third lens with positive power, and a fourth lens with negative power; The effective focal length f of the optical lens and the effective focal length f2 of the second lens satisfy the following relationship: ∣f/f2∣﹤0.60. 2. The optical lens according to claim 1, wherein the entrance pupil diameter EPD of the optical lens and the effective half-diameter DTg of the aperture at the object side of the aperture satisfy the following relationship: EPD/DTg﹥ 1.6. 3. The optical lens according to claim 1, wherein the height H1 of the object and the image height H2 of the object after passing through the optical lens satisfy the following relationship: 0.1﹤H2/H1﹤0.2. 4. optical lens according to claim 1, is characterized in that, the half-diagonal length ImgH of effective pixel area on the imaging plane of described optical lens and the effective focal length f of described optical lens satisfy following relation: 0.5﹤ImgH/f﹤1.1. 5. The optical lens according to claim 1, wherein the curvature radius R1 of the object side surface of the first lens and the effective focal length f1 of the first lens satisfy the following relationship: 0.3﹤R1/f1﹤1.2. 6 . The optical lens according to claim 1 , wherein the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the The distance TTL on the optical axis from the object side of the first lens to the imaging plane of the optical lens satisfies the following relationship: 0.9﹤(CT1+CT2)/TTL*5﹤1.5. 7. optical lens according to claim 1, is characterized in that, the entrance pupil diameter EPD of described optical lens and the half-diagonal length ImgH of effective pixel area on the imaging plane of described optical lens satisfy following relation: 0.4﹤EPD/ImgH﹤0.8. 8 . The optical lens according to claim 1 , wherein the distance from the object side of the first lens to the imaging surface of the optical lens is effective from the distance TTL on the optical axis to the imaging surface of the optical lens. 9 . The half-diagonal length ImgH of the pixel area satisfies the following relationship: TTL/ImgH≤2.0. The optical lens according to any one of claims 1 to 8, characterized in that, along the optical axis from the object side to the image side, after the fourth lens, the optical lens further comprises: a fifth lens . 10 . An electronic device, characterized in that, the electronic device comprises an optical lens and an image sensor, and the optical lens is the optical lens according to any one of claims 1 to 9 .

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