Small unmanned aerial vehicle lens

Abstract

The utility model relates to a small unmanned aerial vehicle lens which is composed of a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged in the light incidence direction. A proper aspheric surface type structure is matched, so that the resolution of the lens is improved, and a high-definition effect is achieved; the first piece is made of glass, so that the wear resistance of the lens is improved; a large number of plastic lenses are adopted, so that the advantages of light weight, miniaturization, low cost and the like are realized; the aperture value is smaller than F1.6, the peripheral relative illumination is larger than 50%, and the light transmission capacity is large; and the imaging target surface is relatively large, and can be adapted to multiple types of chips.

Description

Technical Field

[0001] The utility model relates to a small unmanned aerial vehicle lens. Background Art

[0002] With the development of technology, my country's civilian drone industry has developed rapidly, and it has played an important role in agriculture, urban management, disaster relief and other fields. Drone image acquisition technology uses its own optical lens to capture image information of the target area, and then presents it to the user through transmission, image processing and other technologies. As people's requirements for drones continue to increase, the optical lenses required for image acquisition are gradually tending to be high-definition, miniaturized, and lightweight. However, drone lenses currently generally use multiple glass lenses. While meeting high-definition requirements, the lenses have the disadvantages of being large in size and weight. Summary of the invention

[0003] The utility model proposes a small unmanned aerial vehicle lens, which realizes high-definition imaging and has the advantages of light weight, miniaturization, low distortion, large light aperture, etc.

[0004] The solution adopted by the utility model to solve the technical problem is a small unmanned aerial vehicle lens, characterized in that the lens is composed of a first lens, an aperture, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence along the incident direction of light.

[0005] Furthermore, the first lens is a positive lens, whose object side surface is convex and whose image side surface is concave; the second lens is a negative lens, whose object side surface is convex and whose image side surface is concave; the third lens is a positive lens, whose object side surface in the paraxial region is convex and whose image side surface is convex; the fourth lens is a negative lens, whose object side surface in the paraxial region is concave and whose image side surface is convex; the fifth lens is a positive lens, whose object side surface in the paraxial region is convex and whose image side surface is concave; the sixth lens is a positive lens, whose object side surface in the paraxial region is convex and whose image side surface is concave; the seventh lens is a negative lens, whose object side surface in the paraxial region is concave and whose image side surface is convex.

[0006] Furthermore, the first lens is a glass spherical lens, and the other lenses except the first lens are plastic aspherical lenses.

[0007] Furthermore, the air gap between the first lens and the second lens is 0.7-1.1 mm; the air gap between the second lens and the third lens is 1.2-1.7 mm; the air gap between the third lens and the fourth lens is 0.2-0.7 mm; the air gap between the fourth lens and the fifth lens is 0.2-0.7 mm; the air gap between the fifth lens and the sixth lens is 2.1-2.5 mm; and the air gap between the sixth lens and the seventh lens is 1.3-1.7 mm.

[0008] Furthermore, the first lens satisfies the relationship: N d ≤1.5, V d ≥50.0; the second lens satisfies the relationship: N d ≥1.5, V d ≤50.0; the third lens satisfies the relationship: N d ≥1.8, V d ≥50.0; the fourth lens satisfies the relationship: N d ≥1.5, V d ≤50.0; the fifth lens satisfies the relationship: N d ≥1.8, V d ≥50.0; the sixth lens satisfies the relationship: N d ≥1.5, V d ≤50.0; the seventh lens satisfies the relationship: N d ≥1.8, V d ≥50.0; where N d is the refractive index, V d is the Abbe constant.

[0009] Furthermore, the focal length of the lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are f1, f2, f3, f4, f5, f6, and f7, respectively, wherein f1, f2, f3, f4, f5, f6, and f7 satisfy the following ratio with f: 0.5 <f1 / f<1.5,-2.0<f2 / f<-1.0,1.5<f3 / f<2.5,-9.0<f4 / f<-8.0,1.5<f5 / f<2.5,9.0<f6 / f<10.0,-1.5<f7 / f<-0.5。

[0010] Furthermore, the curve equation of the plastic aspheric lens is expressed as:

[0011]

[0012] Among them, Z is the height of the aspheric surface from the vertex of the aspheric surface when it is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface; k is the cone constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all high-order coefficients.

[0013] Furthermore, the total optical length TTL of the lens and the focal length f of the optical system satisfy: TTL / f≤1.5.

[0014] Furthermore, the image height H of the lens and the focal length f of the optical system satisfy: H / f≥1.1.

[0015] Furthermore, the F number of the lens is ≤1.6.

[0016] Compared with the prior art, the utility model has the following beneficial effects: seven lenses are used, namely, one glass spherical lens plus six plastic aspherical lenses, suitable lens materials are selected, and suitable aspherical surface structures are matched to improve the resolution of the lens and achieve high-definition effects; the first lens is made of glass material to improve the wear resistance of the lens; a large number of plastic lenses are used to achieve the advantages of lightweight, miniaturization, and low cost; the aperture value is less than F1.6, the peripheral relative illumination is greater than 50%, and it has a large light transmission ability; it has a large imaging target surface and can be adapted to a variety of chips. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the optical structure of the utility model;

[0018] Figure 2 It is the axial chromatic aberration diagram of the full working band of the utility model;

[0019] Figure 3 It is the vertical axis chromatic aberration diagram of the full working band of the utility model;

[0020] Figure 4 It is the field curvature distortion diagram of the full working band of the utility model.

[0021] In the figure: L1-first lens; STO-aperture; L2-second lens; L3-third lens; L4-fourth lens; L5-fifth lens; L6-sixth lens; L7-seventh lens; L8-equivalent glass plate; IMA-imaging surface. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1-4 As shown, a small drone lens is characterized in that the lens consists of a first lens, an aperture, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence along the incident direction of light.

[0024] In this embodiment, the first lens is a positive lens, whose object side surface is convex and whose image side surface is concave; the second lens is a negative lens, whose object side surface is convex and whose image side surface is concave; the third lens is a positive lens, whose object side surface in the paraxial region is convex and whose image side surface is convex; the fourth lens is a negative lens, whose object side surface in the paraxial region is concave and whose image side surface is convex; the fifth lens is a positive lens, whose object side surface in the paraxial region is convex and whose image side surface is concave; the sixth lens is a positive lens, whose object side surface in the paraxial region is convex and whose image side surface is concave; and the seventh lens is a negative lens, whose object side surface in the paraxial region is concave and whose image side surface is convex.

[0025] In this embodiment, the first lens is a glass spherical lens, and the other lenses except the first lens are plastic aspherical lenses.

[0026] In this embodiment, the air gap between the first lens and the second lens is 0.7-1.1 mm; the air gap between the second lens and the third lens is 1.2-1.7 mm; the air gap between the third lens and the fourth lens is 0.2-0.7 mm; the air gap between the fourth lens and the fifth lens is 0.2-0.7 mm; the air gap between the fifth lens and the sixth lens is 2.1-2.5 mm; and the air gap between the sixth lens and the seventh lens is 1.3-1.7 mm.

[0027] In this embodiment, the first lens satisfies the relationship: N d ≤1.5, V d ≥50.0; the second lens satisfies the relationship: N d ≥1.5, V d ≤50.0; the third lens satisfies the relationship: N d ≥1.8, V d ≥50.0; the fourth lens satisfies the relationship: N d ≥1.5, V d ≤50.0; the fifth lens satisfies the relationship: N d ≥1.8, V d ≥50.0; the sixth lens satisfies the relationship: N d ≥1.5, V d ≤50.0; the seventh lens satisfies the relationship: N d ≥1.8, V d ≥50.0; where N d is the refractive index, V d is the Abbe constant.

[0028] In this embodiment, the focal length of the lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are f1, f2, f3, f4, f5, f6, and f7, respectively, wherein f1, f2, f3, f4, f5, f6, and f7 satisfy the following ratio with f: 0.5 <f1 / f<1.5,-2.0<f2 / f<-1.0,1.5<f3 / f<2.5,-9.0<f4 / f<-8.0,1.5<f5 / f<2.5,9.0<f6 / f<10.0,-1.5<f7 / f<-0.5。

[0029] In this embodiment, the curve equation of the plastic aspheric lens is expressed as:

[0030]

[0031] Among them, Z is the height of the aspheric surface from the vertex of the aspheric surface when it is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface; k is the cone constant; α1, α2, α3, α4, α5, α6, α7, and α8 are all high-order coefficients.

[0032] In this embodiment, the total optical length TTL of the lens and the focal length f of the optical system satisfy the following relationship: TTL / f≤1.5.

[0033] In this embodiment, the image height H of the lens and the focal length f of the optical system satisfy: H / f≥1.1.

[0034] In this embodiment, the F number of the lens is ≤1.6.

[0035] A working method of a small drone lens: when light is incident, the light path enters the first lens, the aperture, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens in sequence, and finally forms an image on the image plane.

[0036] The technical indicators achieved by the optical system of this embodiment are as follows:

[0037] (1) Focal length: 15 ≤ EFFL ≤ 17 mm; (2) Aperture F ≤ 1.6; (3) Field of view: 2w ≥ 60°; (4) Working band: visible light band.

[0038] To achieve the above design parameters, the specific design adopted by the optical system of this embodiment is shown in the following table:

[0039]

[0040]

[0041] The aspheric coefficients of the aspheric lenses of the optical system of this embodiment are as follows:

[0042]

[0043] The optical system of this embodiment realizes a design of light weight, miniaturization, low distortion and large clear aperture, and at the same time performs good correction for on-axis and off-axis aberrations, so that the lens has high-definition image quality.

[0044] Unless otherwise stated, any technical solution disclosed in the above utility model, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range. Any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many feasible numerical values. Since there are too many numerical values ​​to be exhaustive, the utility model discloses only some numerical values ​​to illustrate the technical solution of the utility model, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the utility model.

[0045] If the words "first", "second" and so on are used in this article to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of description to distinguish the components. Unless otherwise stated, the above words have no special meaning.

[0046] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except where it is obviously impossible to use an one-piece molding process).

[0047] In addition, the orientations or positional relationships indicated by terms such as "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", and "outside" used in any of the technical solutions disclosed in the above-mentioned utility model are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this patent, 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 a limitation on this patent. Unless otherwise stated, the terms used to indicate shapes used in any of the technical solutions disclosed in the above-mentioned utility model include shapes that are approximate, similar or close to them.

[0048] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated molding process.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A small drone lens, Features: The lens is composed of a first lens, an aperture, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are arranged in sequence along the incident direction of light; The air gap between the first lens and the second lens is 0.7-1.1 mm; the air gap between the second lens and the third lens is 1.2-1.7 mm; the air gap between the third lens and the fourth lens is 0.2-0.7 mm; the air gap between the fourth lens and the fifth lens is 0.2-0.7 mm; the air gap between the fifth lens and the sixth lens is 2.1-2.5 mm; and the air gap between the sixth lens and the seventh lens is 1.3-1.7 mm.

2. The small drone lens according to claim 1, Features: The first lens is a positive lens, whose object side surface is convex and whose image side surface is concave; the second lens is a negative lens, whose object side surface is convex and whose image side surface is concave; the third lens is a positive lens, whose object side surface in the paraxial region is convex and whose image side surface is convex; the fourth lens is a negative lens, whose object side surface in the paraxial region is concave and whose image side surface is convex; the fifth lens is a positive lens, whose object side surface in the paraxial region is convex and whose image side surface is concave; the sixth lens is a positive lens, whose object side surface in the paraxial region is convex and whose image side surface is concave; the seventh lens is a negative lens, whose object side surface in the paraxial region is concave and whose image side surface is convex.

3. The small drone lens according to claim 1, Features: The first lens is a glass spherical lens, and the other lenses except the first lens are plastic aspherical lenses.

4. The small drone lens according to claim 1, Features: The first lens satisfies the relationship: N d ≤1.5, V d ≥50.0; the second lens satisfies the relationship: N d ≥1.5, V d ≤50.0; the third lens satisfies the relationship: N d ≥1.8, V d ≥50.0; the fourth lens satisfies the relationship: N d ≥1.5, V d ≤50.0; the fifth lens satisfies the relationship: N d ≥1.8, V d ≥50.0; the sixth lens satisfies the relationship: N d ≥1.5, V d ≤50.0; the seventh lens satisfies the relationship: N d ≥1.8, V d ≥50.0; where N d is the refractive index, V d is the Abbe constant.

5. The small drone lens according to claim 1, Features: The focal length of the lens is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are f respectively. 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 , where f 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 Satisfy the following ratio with f: 0.5 <f 1 / f<1.5,-2.0 <f 2 / f<-1.0,1.5 <f 3 / f<2.5, -9.0 <f 4 / f<-8.0,1.5 <f 5 / f<2.5,9.0 <f 6 / f<10.0,-1.5 <f 7 / f<-0.

5.

6. The small drone lens according to claim 1, Features: The curve equation of the plastic aspheric lens is: Where Z is the height of the aspheric surface from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface; k is the cone constant; α 1 , α 2 , α 3 , α 4 , α 5 , α 6 , α 7 , α 8 All are high-order coefficients.

7. The small drone lens according to claim 1, Features: The total optical length TTL of the lens and the focal length f of the optical system satisfy the following condition: TTL / f≤1.

5.

8. The small drone lens according to claim 1, Features: The image height H of the lens and the focal length f of the optical system satisfy: H / f≥1.

1.

9. The small drone lens according to claim 1, Features: The F number of the lens is ≤1.6.

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