Optical imaging lens

Abstract

The utility model relates to the technical field of optical lenses, in particular to an optical imaging lens, which sequentially comprises a diaphragm, an imaging lens, a first lens and a second lens from an object side to an image side along an optical axis. The first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface is a concave surface; the second lens has positive or negative focal power, and the object side surface of the second lens is a concave surface; the third lens has negative focal power; the fourth lens has positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface; the fifth lens has negative focal power; the object side surface is a concave surface, and the image side surface is a concave surface; the first to fifth lenses are plastic aspheric lenses; a relational expression of 0.49 lt is satisfied; and TTL / ImgHlt; 0.52, 0.52; tTL is the total optical length of the optical imaging lens, and ImgH is the real image height corresponding to the maximum field angle of the optical imaging lens. The optical imaging lens has the advantages of wide angle and ultra-thinness while meeting the requirement of higher imaging quality.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, in particular to an optical imaging lens. Background Art

[0002] In recent years, with the rise of portable electronic products with camera functions, the market has higher requirements for the imaging quality and thinness of electronic devices. Large aperture, wide angle, high imaging quality lenses that meet optical imaging performance have problems such as long optical length and complex structure, which makes it difficult to meet the strict requirements of ultra-thin size. In order to meet the development trend of electronic devices towards ultra-thin miniaturization and high image quality, it is urgent to develop an optical imaging lens that combines wide angle, thinness and high imaging quality. Utility Model Content

[0003] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides an optical imaging lens, which is mainly composed of five lenses, and all of the five lenses adopt a plastic aspherical design. Through the reasonable design of the optical focal length and surface shape of the first lens to the fifth lens, and the reasonable allocation of the spacing and thickness of each lens, it is ensured that the optical imaging lens meets the requirements of higher imaging quality while having the advantages of wide angle and ultra-thinness.

[0004] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0005] An optical imaging lens, which is composed of the following components from the object side to the image side along the optical axis:

[0006] Aperture;

[0007] The first lens has positive power; the object side surface of the first lens is convex at the near optical axis, and the image side surface is concave at the near optical axis;

[0008] The second lens has positive or negative optical power; the object side surface of the second lens is a concave surface;

[0009] A third lens having negative optical power;

[0010] The fourth lens has positive power; the object side surface of the fourth lens is concave at the near optical axis, and the image side surface is convex at the near optical axis;

[0011] A fifth lens element having negative optical power; the object side surface of the fifth lens element is concave at the near optical axis, and the image side surface is concave at the near optical axis;

[0012] The first to fifth lenses are all plastic aspherical lenses;

[0013] The optical imaging lens satisfies the following relationship:

[0014] 0.49 <TTL / ImgH<0.52;

[0015] Wherein, TTL is the total optical length of the optical imaging lens, and ImgH is the real image height corresponding to the maximum field of view of the optical imaging lens.

[0016] This configuration shortens the total optical length of the lens, achieving a slim and lightweight design.

[0017] Furthermore, the optical imaging lens satisfies the following conditional formula:

[0018] 92 <Dfov<100

[0019] Wherein, Dfov is the 1.0 field of view angle of the optical imaging lens.

[0020] Controlling the field of view of the optical imaging lens helps achieve a thin and light design.

[0021] Furthermore, the optical imaging lens satisfies the following conditional formula:

[0022] 2.39 <SD11 / ET1<4.26

[0023] Wherein, SD11 is half of the maximum effective aperture of the object side of the first lens of the optical imaging lens, and ET1 is the edge thickness of the first lens of the optical imaging lens.

[0024] By rationally allocating the effective aperture and edge thickness of the first lens, it is helpful to reduce the difficulty of processing and forming the first lens and improve the imaging field of view.

[0025] Furthermore, the optical imaging lens satisfies the following conditional formula:

[0026] 0.22 <SD11 / SD52<0.32

[0027] Among them, SD11 is half of the maximum effective aperture of the object side of the first lens of the optical imaging lens, and SD52 is half of the maximum effective aperture of the image side of the fifth lens of the optical imaging lens.

[0028] By controlling the ratio between half of the maximum effective aperture of the object side of the first lens and half of the maximum effective aperture of the image side of the fifth lens within this range, it helps to achieve a lightweight design and avoid wasting assembly space of the optical system. It also helps to correct aberrations and improve imaging quality.

[0029] Furthermore, the optical imaging lens satisfies the following conditional formula

[0030] 2.60 <f1 / R1<3.10

[0031] Wherein, f1 is the effective focal length of the first lens of the optical imaging lens, and R1 is the radius of curvature of the side surface of the first lens of the optical imaging lens. Meeting this condition can effectively reduce the difficulty of processing the first lens.

[0032] The beneficial effects of the utility model are:

[0033] The utility model provides an optical imaging lens, which is mainly composed of five lenses, and the five lenses are all designed with plastic aspherical surfaces. Through the reasonable design of the optical focal length and surface shape of the first lens to the fifth lens, and the reasonable distribution of the spacing and thickness of each lens, it is ensured that the optical imaging lens meets the requirements of higher imaging quality while having the advantages of wide angle and ultra-thinness. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0035] Figure 2 This is a distortion curve diagram of Example 1 of the utility model;

[0036] Figure 3 is an astigmatism curve diagram of Example 1 of the utility model;

[0037] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;

[0038] Figure 5 This is a distortion curve diagram of Example 2 of the utility model;

[0039] Figure 6 is an astigmatism curve diagram of Example 2 of the utility model;

[0040] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present utility model;

[0041] Figure 8 This is a distortion curve diagram of Example 3 of the utility model;

[0042] Fig. 9 is an astigmatism curve diagram of Example 3 of the utility model;

[0043] Fig.10 This is a schematic diagram of the structure of Embodiment 4 of the present utility model;

[0044] Fig.11 This is a distortion curve diagram of Example 4 of the utility model;

[0045] Fig.12 is an astigmatism curve diagram of Example 4 of the utility model;

[0046] Fig.13 This is a schematic diagram of the structure of Embodiment 5 of the present utility model;

[0047] Fig.14 This is a distortion curve diagram of Example 5 of the present utility model;

[0048] Fig.15 This is an astigmatism curve diagram of Example 5 of the utility model.

[0049] In the figure: 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, fifth lens; 6, aperture; 7, filter. DETAILED DESCRIPTION

[0050] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0051] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0052] In this document, 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.

[0053] An optical imaging lens provided in an embodiment of the utility model is composed of the following components in sequence from the object side to the image side along the optical axis:

[0054] Aperture 6;

[0055] The first lens 1 has positive power; the object side surface of the first lens 1 is convex at the near optical axis, and the image side surface is concave at the near optical axis;

[0056] The second lens 1 has positive or negative optical power; the object side surface of the second lens 2 is concave;

[0057] The third lens 3 has negative optical power;

[0058] The fourth lens 4 has positive power; the object side surface of the fourth lens 4 is concave at the near optical axis, and the image side surface is convex at the near optical axis;

[0059] The fifth lens element 5 has a negative optical power; the object side surface of the fifth lens element 5 is concave at the near optical axis, and the image side surface is concave at the near optical axis;

[0060] The first to fifth lenses are all plastic aspherical lenses;

[0061] The optical imaging lens satisfies the following relationship:

[0062] 0.49 <TTL / ImgH<0.52;

[0063] Wherein, TTL is the total optical length of the optical imaging lens, and ImgH is the real image height corresponding to the maximum field of view of the optical imaging lens.

[0064] This configuration shortens the total optical length of the lens, achieving a slim and lightweight design.

[0065] Specifically, the optical imaging lens satisfies the following conditional formula:

[0066] 92 <Dfov<100

[0067] Wherein, Dfov is the 1.0 field of view angle of the optical imaging lens.

[0068] Controlling the field of view of the optical imaging lens helps achieve a thin and light design.

[0069] Specifically, the optical imaging lens satisfies the following conditional formula:

[0070] 2.39 <SD11 / ET1<4.26

[0071] Wherein, SD11 is half of the maximum effective aperture of the object side of the first lens 1 of the optical imaging lens, and ET1 is the edge thickness of the first lens 1 of the optical imaging lens.

[0072] By rationally allocating the effective aperture and edge thickness of the first lens 1 , it is helpful to reduce the difficulty of processing and forming the first lens 1 and improve the imaging field angle.

[0073] Specifically, the optical imaging lens satisfies the following conditional formula:

[0074] 0.22 <SD11 / SD52<0.32

[0075] Wherein, SD11 is half of the maximum effective aperture of the object side of the first lens 1 of the optical imaging lens, and SD52 is half of the maximum effective aperture of the image side of the fifth lens 5 of the optical imaging lens.

[0076] By controlling the ratio of half the maximum effective aperture of the object side of the first lens 1 to half the maximum effective aperture of the image side of the fifth lens 5 within this range, it helps to achieve a lightweight design and avoid wasting assembly space of the optical system. It also helps to correct aberrations and improve imaging quality.

[0077] Specifically, the optical imaging lens satisfies the following conditional formula:

[0078] 2.60 <f1 / R1<3.10

[0079] Wherein, f1 is the effective focal length of the first lens of the optical imaging lens, and R1 is the radius of curvature of the side surface of the first lens of the optical imaging lens.

[0080] By controlling the effective focal length of the first lens 1 and the radius of curvature of the object side surface of the first lens 1 , the difficulty of processing the first lens can be effectively reduced.

[0081] The above-mentioned lens may further include a filter 9 for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface according to the specific needs of the embodiment. In the absence of specific requirements, the filter 9 or the protective glass may not be used.

[0082] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0083] Example 1

[0084] The present embodiment provides an optical imaging lens, which is composed of an aperture 6, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5 and a filter 7 in sequence from the object side to the image side along the optical axis. The incident light passes through the above components in sequence and finally forms an image on the image plane. The first lens 1 has a positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 2 has a negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 3 has a negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 4 has a positive focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 5 has a negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The filter 7 is arranged between the fifth lens 5 and the image plane.

[0085] Table 1 shows the surface type, curvature radius, thickness and material properties of each lens in Example 1. The units of the curvature radius and thickness are both millimeters (mm).

[0086] Table 1 is a table of lens parameters of the lens of Example 1.

[0087]

[0088] In this embodiment, the surface shape x of each aspheric lens can be defined by, but not limited to, the following aspheric formula:

[0089]

[0090] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; A i The following Table 2 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspheric mirror surfaces S1-S10 that can be used in Example 1.

[0091] Table 2 is a table of high-order coefficients of various aspherical mirror surfaces in Example 1.

[0092]

[0093] Table 3 below shows important parameters in Example 1.

[0094] Table 3 is a table of important parameters of Example 1.

[0095]

[0096]

[0097] The specific lens structure of this embodiment is as follows Figure 1 As shown in Table 1-3 and Figure 1-3 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the lens meets the requirements of higher imaging quality while having the advantages of wide angle and ultra-thinness.

[0098] Example 2

[0099] The present embodiment provides an optical imaging lens, which is composed of an aperture 6, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5 and a filter 7 in sequence from the object side to the image side along the optical axis. The incident light passes through the above components in sequence and finally forms an image on the image plane. The first lens 1 has a positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 2 has a positive focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 3 has a negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 4 has a positive focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 5 has a negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The filter 7 is arranged between the fifth lens 5 and the image plane.

[0100] Table 4 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 2. The units of the radius of curvature and thickness are both millimeters (mm).

[0101] Table 4 is a table of lens parameters of Example 2.

[0102]

[0103]

[0104] In this embodiment, each aspheric surface shape can be defined by the formula (1) in the above embodiment 1. Table 5 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 of each aspheric mirror surface S1-S10 that can be used in embodiment 2.

[0105] Table 5 is a table of high-order coefficients of each aspherical mirror surface in Example 2.

[0106]

[0107] Table 6 below shows important parameters in Example 2.

[0108] Table 6 is a table of important parameters of Example 2.

[0109]

[0110]

[0111] The specific lens structure of this embodiment is as follows Figure 4 Table 4-6 and Figure 4-6 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the lens meets the requirements of higher imaging quality while having the advantages of wide angle and ultra-thinness.

[0112] Example 3

[0113] The present embodiment provides an optical imaging lens, which is composed of an aperture 6, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5 and a filter 7 in sequence from the object side to the image side along the optical axis. The incident light passes through the above components in sequence and finally forms an image on the image plane. The first lens 1 has a positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 2 has a positive focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 3 has a negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fourth lens 4 has a positive focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 5 has a negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The filter 7 is arranged between the fifth lens 5 and the image plane.

[0114] Table 7 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 3. The units of the radius of curvature and thickness are both millimeters (mm).

[0115] Table 7 is a table of lens parameters of Example 3.

[0116]

[0117]

[0118] In this embodiment, each aspheric surface shape can be defined by the formula (1) in the above embodiment 1. Table 8 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 of each aspheric mirror surface S1-S10 that can be used in embodiment 3.

[0119] Table 8 is a table of high-order coefficients of each aspherical mirror surface in Example 3.

[0120]

[0121] Table 9 below shows important parameters in Example 3.

[0122] Table 9 is a table of important parameters of Example 3.

[0123]

[0124] The specific lens structure of this embodiment is as follows Figure 7 As shown in Table 7-9 and Figure 7-9 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the lens meets the requirements of higher imaging quality while having the advantages of wide angle and ultra-thinness.

[0125] Example 4

[0126] The present embodiment provides an optical imaging lens, which is composed of an aperture 6, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5 and a filter 7 in sequence from the object side to the image side along the optical axis. The incident light passes through the above components in sequence and finally forms an image on the image plane. The first lens 1 has a positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 2 has a negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 3 has a negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fourth lens 4 has a positive focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 5 has a negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The filter 7 is arranged between the fifth lens 5 and the image plane.

[0127] Table 10 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 4. The units of the radius of curvature and thickness are both millimeters (mm).

[0128] Table 10 is a table of lens parameters of Example 4.

[0129]

[0130] In this embodiment, each aspheric surface shape can be defined by the formula (1) in the above embodiment 1. Table 11 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20 of each aspheric mirror surface S1-S10 that can be used in embodiment 4.

[0131] Table 11 is a table of high-order coefficients of each aspherical mirror surface in Example 4.

[0132]

[0133] Table 12 below shows important parameters in Example 4.

[0134] Table 12 is a table of important parameters of Example 4.

[0135]

[0136] The specific lens structure of this embodiment is as follows Fig.10 Table 10-12 and Figure 10-12 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the lens meets the requirements of higher imaging quality while having the advantages of wide angle and ultra-thinness.

[0137] Example 5

[0138] The present embodiment provides an optical imaging lens, which is composed of an aperture 6, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5 and a filter 7 in sequence from the object side to the image side along the optical axis. The incident light passes through the above components in sequence and finally forms an image on the image plane. The first lens 1 has a positive focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 2 has a negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The third lens 3 has a negative focal power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 4 has a positive focal power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 5 has a negative focal power, and its object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The filter 7 is arranged between the fifth lens 5 and the image plane.

[0139] Table 13 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 5. The units of the radius of curvature and thickness are both millimeters (mm).

[0140] Table 13 is a table of lens parameters of Example 5.

[0141]

[0142] In this embodiment, each aspheric surface shape can be defined by the formula (1) in the above embodiment 1. Table 14 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of each aspheric mirror surface S1-S10 that can be used in embodiment 5.

[0143] Table 14 is a table of high-order coefficients of each aspherical mirror surface in Example 5.

[0144]

[0145]

[0146] Table 15 below shows important parameters in Example 5.

[0147] Table 15 is a table of important parameters of Example 5.

[0148]

[0149] The specific lens structure of this embodiment is as follows Fig.13 Table 13-15 and Figure 13-15 The lens shape and various properties of the lens of the current embodiment are shown, indicating that the lens meets the requirements of higher imaging quality while having the advantages of wide angle and ultra-thinness.

[0150] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An optical imaging lens, characterized in that: Along the optical axis from the object side to the image side, it is composed of: Aperture; The first lens has positive power; the object side surface of the first lens is convex at the near optical axis, and the image side surface is concave at the near optical axis; The second lens has positive or negative optical power; the object side surface of the second lens is a concave surface; A third lens having negative optical power; The fourth lens has positive power; the object side surface of the fourth lens is concave at the near optical axis, and the image side surface is convex at the near optical axis; A fifth lens element having negative optical power; the object side surface of the fifth lens element is concave at the near optical axis, and the image side surface is concave at the near optical axis; The first to fifth lenses are all plastic aspherical lenses; The optical imaging lens satisfies the following relationship: 0.49 <TTL / ImgH<0.52; Wherein, TTL is the total optical length of the optical imaging lens, and ImgH is the real image height corresponding to the maximum field of view of the optical imaging lens.

2. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies the following conditional formula: 92 <Dfov<100 Wherein, Dfov is the 1.0 field of view angle of the optical imaging lens.

3. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies the following conditional formula: 2.39 <SD11 / ET1<4.26 Wherein, SD11 is half of the maximum effective aperture of the object side of the first lens of the optical imaging lens, and ET1 is the edge thickness of the first lens of the optical imaging lens.

4. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies the following conditional formula: 0.22 <SD11 / SD52<0.32 Among them, SD11 is half of the maximum effective aperture of the object side of the first lens of the optical imaging lens, and SD52 is half of the maximum effective aperture of the image side of the fifth lens of the optical imaging lens.

5. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies the following conditional formula: 2.60 <f1 / R1<3.10 Wherein, f1 is the effective focal length of the first lens of the optical imaging lens, and R1 is the radius of curvature of the side surface of the first lens of the optical imaging lens.

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