Four-piece near-infrared lens and electronic equipment

Abstract

The utility model provides a four-piece near-infrared lens, which comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens and a plane mirror which are sequentially arranged along the optical axis direction from the object side to the image side, the object side surface of the optical axis area of the first lens is a convex surface, the image side surface of the optical axis area of the first lens is a concave surface, and the object side surface of the optical axis area of the fourth lens is a convex surface. The four-piece near-infrared lens satisfies the following relational expression: f1'lt; 0, f2'gt; 0, f3'gt; 0, f4'gt; 0; -2lt;-2lt; f1 ' / f3'lt; 0, 0.2 lt; f3 ' / f4'lt; 3,-0.8 lt; f ' / f1'lt; 0, 0lt; f ' / f2'lt; 0, 0.2,-0.6 lt; f ' / f12'lt; 0,-5lt; f123 ' / f4'lt; 1; 0.18 lt, 0.18 lt; iH / TTLlt; and 0.3. According to the four-piece near-infrared lens, by setting the structures and parameters of the first lens, the second lens, the third lens and the fourth lens, the field angle of the product is 100-150 degrees, and the field angle is large.

Description

A 4-element near-infrared lens and electronic device Technical Field

[0001] This utility model relates to the field of lens technology, and in particular to a four-element near-infrared lens and electronic device. Background Technology

[0002] Near-infrared (NIR) light refers to electromagnetic waves with wavelengths in the range of 780nm-2500nm. The optical materials and coating technology of near-infrared lenses are specially designed to transmit and focus near-infrared light, enabling clear near-infrared images to be projected onto the image sensor. Simultaneously, it minimizes the transmission and interference with visible light to highlight information in the near-infrared band.

[0003] Existing near-infrared lenses generally have a field of view of less than 90°, resulting in a small field of view. Summary of the Invention

[0004] The purpose of this invention is to provide a 4-element near-infrared lens to solve the problem of small field of view of existing near-infrared lenses.

[0005] This utility model provides a four-element near-infrared lens, comprising a first lens, a second lens, an aperture, a third lens, a fourth lens, and a plane mirror arranged sequentially from the object side to the image side along the optical axis. The object side of the first lens in the optical axis region is convex, and the image side is concave. The four-element near-infrared lens satisfies the following relationship:

[0006] f1'<0, f2'>0, f3'>0, f4'>0;

[0007] -2 <f1' / f3'<0,0.2<f3' / f4'<3,-0.8<f' / f1'<0,0<f' / f2'<0.2,-0.6<f' / f12'<0,-5<f123' / f4'<1;

[0008] 0.18 <IH / TTL<0.3;

[0009] Wherein, f' is the focal length of the four-element near-infrared lens, TTL is the distance between the object side and the image plane of the first lens, IH is the half-image height of the four-element near-infrared lens, the focal lengths of the first lens to the fourth lens are f1', f2', f3', and f4' respectively, f12' is the combined focal length of the first lens and the second lens, and f123' is the combined focal length of the first lens, the second lens, and the third lens.

[0010] The aforementioned four-element near-infrared lens, through the structure and parameter settings of the first, second, third, and fourth lenses, enables the product to have a field of view of 100° to 150°, resulting in a large field of view.

[0011] Furthermore, the refractive indices of the first lens, the third lens, and the fourth lens are all greater than 1.5.

[0012] Furthermore, the Abbe numbers of the first lens, the third lens, and the fourth lens are less than 60.

[0013] Furthermore, the aperture number of the four-element near-infrared lens is greater than 1.3.

[0014] Furthermore, the aforementioned four-element near-infrared lens also satisfies the following relationship:

[0015] 0.3 <SAG11 / SAG12<1.5;

[0016] 0 <SAG31 / SAG32<2.5;

[0017] 0.5 <SAG41 / SAG42<3;

[0018] Wherein, SAG11 is the sagitta of the object-side surface of the first lens, SAG12 is the sagitta of the image-side surface of the first lens, SAG31 is the sagitta of the object-side surface of the third lens, SAG32 is the sagitta of the image-side surface of the third lens, SAG41 is the sagitta of the object-side surface of the fourth lens, and SAG42 is the sagitta of the image-side surface of the fourth lens.

[0019] Furthermore, the aforementioned four-element near-infrared lens also satisfies the following relationship:

[0020] 1.6 <Y11 / Y21<2.5;

[0021] 0.5 <Y31 / Y42<1;

[0022] Wherein, Y11 is the maximum effective radius of the object side of the first lens, Y21 is the maximum effective radius of the object side of the second lens, Y31 is the maximum effective radius of the object side of the third lens, and Y42 is the maximum effective radius of the image side of the fourth lens.

[0023] Furthermore, the aforementioned four-element near-infrared lens also satisfies the following relationship:

[0024] 3 <R1 / R2<30;

[0025] 0.5 <R3 / R4<1.5;

[0026] -5 <R5 / R6<0;

[0027] Wherein, R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, R3 is the radius of curvature of the object side of the second lens, R4 is the radius of curvature of the image side of the second lens, R5 is the radius of curvature of the object side of the third lens, and R6 is the radius of curvature of the image side of the third lens.

[0028] Furthermore, the aforementioned four-element near-infrared lens also satisfies the following relationship:

[0029] 1.5 <T1 / T2<2.5;

[0030] 0.5 <T3 / T4<1.5;

[0031] 0.5 <T12 / T3<2;

[0032] 1.5 <T123 / T4<3.5

[0033] Wherein, T1 is the center thickness of the first lens, T2 is the center thickness of the second lens, T3 is the center thickness of the third lens, T4 is the center thickness of the fourth lens, T12 is the combined center thickness of the first lens and the second lens, and T123 is the combined center thickness of the first lens, the second lens, and the third lens.

[0034] Furthermore, the aforementioned four-element near-infrared lens also satisfies the following relationship:

[0035] 0.5 <A12 / A23<2;

[0036] 2 <A12 / A34<25;

[0037] Wherein, A12 is the air gap between the first lens and the second lens, A23 is the air gap between the second lens and the third lens, and A34 is the air gap between the third lens and the fourth lens.

[0038] This invention also provides an electronic device, including a four-element near-infrared lens as described in any of the above claims. Attached Figure Description

[0039] Figure 1 is a schematic diagram of the structure of a four-piece near-infrared lens in the first embodiment of the present invention;

[0040] Figure 2 shows the field curvature and distortion diagram of a 4-element near-infrared lens shown in Figure 1;

[0041] Figure 3 is a polychromatic light diffraction modulation transfer function curve of a four-element near-infrared lens shown in Figure 1.

[0042] Figure 4 is a structural schematic diagram of a four-piece near-infrared lens according to the second embodiment of this utility model;

[0043] Figure 5 shows the field curvature and distortion diagram of a four-element near-infrared lens shown in Figure 4;

[0044] Figure 6 is a polychromatic light diffraction modulation transfer function curve of a four-element near-infrared lens shown in Figure 4.

[0045] Figure 7 is a structural schematic diagram of a four-piece near-infrared lens according to the third embodiment of this utility model;

[0046] Figure 8 shows the field curvature and distortion diagram of a 4-element near-infrared lens shown in Figure 7;

[0047] Figure 9 shows the polychromatic light diffraction modulation transfer function curve of a four-element near-infrared lens as shown in Figure 7.

[0048] Figure 10 is a structural schematic diagram of a four-piece near-infrared lens according to the fourth embodiment of this utility model;

[0049] Figure 11 shows the field curvature and distortion diagram of a 4-element near-infrared lens in Figure 10;

[0050] Figure 12 is a polychromatic light diffraction modulation transfer function curve of a four-element near-infrared lens shown in Figure 10.

[0051] Figure 13 is a structural schematic diagram of a four-piece near-infrared lens according to the fifth embodiment of this utility model;

[0052] Figure 14 shows the field curvature and distortion diagram of a 4-element near-infrared lens shown in Figure 13;

[0053] Figure 15 is a polychromatic light diffraction modulation transfer function curve of a four-element near-infrared lens shown in Figure 13.

[0054] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0055] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0056] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0058] Please refer to Figures 1 to 3. The first embodiment of this utility model provides a four-element near-infrared lens, which consists of a first lens 11, a second lens 12, an aperture stop, a third lens 13, a fourth lens 14, and a plane mirror 15 arranged sequentially from the object side to the image side along the optical axis. The object side of the optical axis region of the first lens 11 is convex, and the image side is concave. The four-element near-infrared lens satisfies the following relationship:

[0059] f1'<0, f2'>0, f3'>0, f4'>0;

[0060] -2 <f1' / f3'<0,0.2<f3' / f4'<3,-0.8<f' / f1'<0,0<f' / f2'<0.2,-0.6<f' / f12'<0,-5<f123' / f4'<1;

[0061] 0.18 <IH / TTL<0.3;

[0062] Wherein, f' is the focal length of the four-element near-infrared lens, TTL is the distance between the object side and the image plane of the first lens 11, IH is the half-image height of the four-element near-infrared lens, the focal lengths of the first lens 11 to the fourth lens 14 are f1', f2', f3', and f4' respectively, f12' is the combined focal length of the first lens 11 and the second lens 14, and f123' is the combined focal length of the first lens 11, the second lens 14, and the third lens 13.

[0063] Specifically, in this embodiment, the system parameters and structural parameters of the four-element near-infrared lens satisfy Table 1, and the aspherical parameters satisfy Table 2.

[0064] Table 1

[0065]

[0066] Table 2

[0067]

[0068]

[0069] The aforementioned four-element near-infrared lens, through the structure and parameter settings of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14, enables the product to have a field of view of 115°, which is a large field of view.

[0070] Please refer to Figures 4 to 6. The second embodiment of this utility model provides a four-element near-infrared lens, which consists of a first lens 11, a second lens 12, an aperture stop, a third lens 13, a fourth lens 14, and a plane mirror 15 arranged sequentially from the object side to the image side along the optical axis. The object side of the optical axis region of the first lens 11 is convex, and the image side is concave.

[0071] Specifically, in this embodiment, the system parameters and structural parameters of the four-element near-infrared lens meet the requirements of Table 3, and the aspherical parameters meet the requirements of Table 4.

[0072] Table 3

[0073]

[0074]

[0075] Table 4

[0076]

[0077] The aforementioned four-element near-infrared lens, through the structure and parameter settings of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14, enables the product to have a field of view of 119°, which is a large field of view.

[0078] Please refer to Figures 7 to 9. The third embodiment of this utility model provides a four-element near-infrared lens, which consists of a first lens 11, a second lens 12, an aperture stop, a third lens 13, a fourth lens 14, and a plane mirror 15 arranged sequentially from the object side to the image side along the optical axis. The object side of the optical axis region of the first lens 11 is convex, and the image side is concave. In this embodiment, the system parameters and structural parameters of the four-element near-infrared lens satisfy Table 5, and the aspherical parameters satisfy Table 6.

[0079] Table 5

[0080]

[0081]

[0082] Table 6

[0083]

[0084] The aforementioned four-element near-infrared lens, through the structure and parameter settings of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14, enables the product to have a field of view of 144°, which is a large field of view.

[0085] Please refer to Figures 10 to 12. The fourth embodiment of this utility model provides a four-element near-infrared lens, which consists of a first lens 11, a second lens 12, an aperture stop, a third lens 13, a fourth lens 14, and a plane mirror 15 arranged sequentially from the object side to the image side along the optical axis. The object side of the optical axis region of the first lens 11 is convex, and the image side is concave. In this embodiment, the system parameters and structural parameters of the four-element near-infrared lens satisfy Table 7, and the aspherical parameters satisfy Table 8.

[0086] Table 7

[0087]

[0088] Table 8

[0089]

[0090] The aforementioned four-element near-infrared lens, through the structure and parameter settings of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14, enables the product to have a field of view of 115°, which is a large field of view.

[0091] Please refer to Figures 13 to 15. The fifth embodiment of this utility model provides a four-element near-infrared lens, which consists of a first lens 11, a second lens 12, an aperture stop, a third lens 13, a fourth lens 14, and a plane mirror 15 arranged sequentially from the object side to the image side along the optical axis. The object side of the optical axis region of the first lens 11 is convex, and the image side is concave. In this embodiment, the system parameters and structural parameters of the four-element near-infrared lens satisfy Table 9, and the aspherical parameters satisfy Table 10.

[0092] Table 9

[0093]

[0094] Table 10

[0095]

[0096] The aforementioned four-element near-infrared lens, through the structure and parameter settings of the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14, enables the product to have a field of view of 105°, which is a large field of view.

[0097] In one embodiment of this utility model, the refractive indices of the first lens 11, the third lens 13, and the fourth lens 14 are all greater than 1.5.

[0098] In one embodiment of this utility model, the Abbe number of the first lens 11, the third lens 13 and the fourth lens 14 is less than 85.

[0099] In one embodiment of this utility model, the aperture number of the four-element near-infrared lens is greater than 1.3.

[0100] In one embodiment of this utility model, the four-element near-infrared lens also satisfies the following relationship:

[0101] 0.3 <SAG11 / SAG12<1.5;

[0102] 0 <SAG31 / SAG32<2.5;

[0103] 0.5 <SAG41 / SAG42<3;

[0104] Wherein, SAG11 is the sagitta of the object-side surface of the first lens 11, SAG12 is the sagitta of the image-side surface of the first lens 11, SAG31 is the sagitta of the object-side surface of the third lens 13, SAG32 is the sagitta of the image-side surface of the third lens 13, SAG41 is the sagitta of the object-side surface of the fourth lens 14, and SAG42 is the sagitta of the image-side surface of the fourth lens 14.

[0105] In one embodiment of this utility model, the four-element near-infrared lens also satisfies the following relationship:

[0106] 1.6 <Y11 / Y21<2.5;

[0107] 0.5 <Y31 / Y42<1;

[0108] Wherein, Y11 is the maximum effective radius of the object side of the first lens 11, Y21 is the maximum effective radius of the object side of the second lens 12, Y31 is the maximum effective radius of the object side of the third lens 13, and Y42 is the maximum effective radius of the image side of the fourth lens 14.

[0109] In one embodiment of this utility model, the four-element near-infrared lens also satisfies the following relationship:

[0110] 3 <R1 / R2<30;

[0111] 0.5 <R3 / R4<1.5;

[0112] -5 <R5 / R6<0;

[0113] Wherein, R1 is the radius of curvature of the object side of the first lens 11, R2 is the radius of curvature of the image side of the first lens 11, R3 is the radius of curvature of the object side of the second lens 12, R4 is the radius of curvature of the image side of the second lens 12, R5 is the radius of curvature of the object side of the third lens 13, and R6 is the radius of curvature of the image side of the third lens 13.

[0114] In one embodiment of this utility model, the four-element near-infrared lens also satisfies the following relationship:

[0115] 1.5 <T1 / T2<2.5;

[0116] 0.5 <T3 / T4<1.5;

[0117] 0.5 <T12 / T3<2;

[0118] 1.5 <T123 / T4<3.5

[0119] Wherein, T1 is the center thickness of the first lens 11, T2 is the center thickness of the second lens 12, T3 is the center thickness of the third lens 13, T4 is the center thickness of the fourth lens 14, T12 is the combined center thickness of the first lens 11 and the second lens 12, and T123 is the combined center thickness of the first lens 11, the second lens 12, and the third lens 13.

[0120] In one embodiment of this utility model, the four-element near-infrared lens also satisfies the following relationship:

[0121] 0.5 <A12 / A23<2;

[0122] 2 <A12 / A34<25;

[0123] Wherein, A12 is the air gap between the first lens 11 and the second lens 12, A23 is the air gap between the second lens 12 and the third lens 13, and A34 is the air gap between the third lens 13 and the fourth lens 14.

[0124] This utility model embodiment also provides an electronic device, including a four-element near-infrared lens as described in any of the above.

[0125] The aforementioned electronic device, through the structure and parameter settings of the first lens, second lens, third lens, and fourth lens, enables the product to have a field of view of 100° to 150°, which is a large field of view.

[0126] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A four-element near-infrared lens, characterized in that, It consists of a first lens, a second lens, an aperture stop, a third lens, a fourth lens, and a plane mirror arranged in sequence from the object side to the image side along the optical axis direction. The object side surface of the optical axis region of the first lens is convex, and the image side surface is concave. The four-piece near-infrared lens satisfies the following relationships: f1' < 0, f2' > 0, f3' > 0, f4' > 0; -2 < f1' / f3' < 0, 0.2 < f3' / f4' < 3, -0.8 < f' / f1' < 0, 0 < f' / f2' < 0.2, -0.6 < f' / f12' < 0, -5 < f123' / f4' < 1; 0.18 < IH / TTL < 0.3; where f' is the focal length of the four-piece near-infrared lens, TTL is the distance from the object side surface of the first lens to the image surface, IH is the semi-image height of the four-piece near-infrared lens, the focal lengths of the first lens to the fourth lens are f1', f2', f3', f4" respectively, f12' is the combined focal length of the first lens and the second lens, and f123' is the combined focal length of the first lens, the second lens, and the third lens.

2. A four-element near-infrared lens according to claim 1, characterized in that, The refractive indices of the first lens, the third lens, and the fourth lens are all greater than 1.

5.

3. A four-element near-infrared lens according to claim 1, characterized in that, The Abbe numbers of the first lens, the third lens, and the fourth lens are less than 60.

4. A four-element near-infrared lens according to claim 1, characterized in that, The aperture number of the four-piece near-infrared lens is greater than 1.

3.

5. A four-element near-infrared lens according to claim 1, characterized in that, The four-piece near-infrared lens also satisfies the following relationships: 0.3 < SAG11 / SAG12 < 1.5; 0 < SAG31 / SAG32 < 2.5; 0.5 < SAG41 / SAG42 < 3; where SAG11 is the sag of the object side surface of the first lens, SAG12 is the sag of the image side surface of the first lens, SAG31 is the sag of the object side surface of the third lens, SAG32 is the sag of the image side surface of the third lens, SAG41 is the sag of the object side surface of the fourth lens, and SAG42 is the sag of the image side surface of the fourth lens.

6. A four-element near-infrared lens according to claim 1, characterized in that, The four-piece near-infrared lens also satisfies the following relationships: 1.6 < Y11 / Y21 < 2.5; 0.5 < Y31 / Y42 < 1; where Y11 is the maximum effective radius of the object side surface of the first lens, Y21 is the maximum effective radius of the object side surface of the second lens, Y31 is the maximum effective radius of the object side surface of the third lens, and Y42 is the maximum effective radius of the image side surface of the fourth lens.

7. A four-element near-infrared lens according to claim 1, characterized in that, The four-piece near-infrared lens also satisfies the following relationships: 3 < R1 / R2 < 30; 0.5 < R3 / R4 < 1.5; -5 < R5 / R6 < 0; where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens.

8. A four-element near-infrared lens according to claim 1, characterized in that, The described four-piece near-infrared lens also satisfies the following relationships: 1.5 < T1 / T2 < 2.5; 0.5 < T3 / T4 < 1.5; 0.5 < T12 / T3 < 2; 1.5 < T123 / T4 < 3.

5. Here, T1 is the central thickness of the first lens, T2 is the central thickness of the second lens, T3 is the central thickness of the third lens, T4 is the central thickness of the fourth lens, T12 is the combined central thickness of the first lens and the second lens, and T123 is the combined central thickness of the first lens, the second lens, and the third lens.

9. A four-element near-infrared lens according to claim 1, characterized in that, The described four-piece near-infrared lens also satisfies the following relationships: 0.5 < A12 / A23 < 2; 2 < A12 / A34 < 25. Here, A12 is the air gap between the first lens and the second lens, A23 is the air gap between the second lens and the third lens, and A34 is the air gap between the third lens and the fourth lens.

10. An electronic device, characterized in that, Comprising a four-piece near-infrared lens according to any one of claims 1-9.

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