A small unmanned aerial vehicle lens and a working method thereof

Abstract

The application relates to a small unmanned aerial vehicle lens and a working method thereof, wherein the lens 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 arranged in sequence along the light incidence direction; the lens adopts seven lenses, the lens resolution is improved by selecting appropriate lens materials and matching appropriate aspheric surface structures, and a high-definition effect is achieved; the first lens is made of glass material, the wear resistance of the lens is improved; a large number of plastic lenses are adopted, and the advantages of light weight, small size, low cost and the like are realized; the aperture value is less than F1.6, the peripheral relative luminance is greater than 50%, the lens has large light transmission capacity; the lens has a large imaging target surface and can be adapted to multiple chips.

Description

TECHNICAL FIELD

[0001] The application relates to a small unmanned aerial vehicle lens and a working method thereof. BACKGROUND

[0002] With the development of technology, the civil unmanned aerial vehicle industry in China develops rapidly, and plays an important role in the fields of agriculture, city management, rescue and disaster relief. The unmanned aerial vehicle image acquisition technology shoots the image information of a target area through an optical lens carried by itself, and finally presents to the user through transmission and image processing technology. With the increasing demand of people for unmanned aerial vehicles, the optical lens required for image acquisition gradually tends to be high-definition, small, light and the like. However, the unmanned aerial vehicle lens generally adopts multiple glass lenses at present, which has the shortcomings of large size and weight while meeting the high-definition requirement. SUMMARY

[0003] The application provides a small unmanned aerial vehicle lens and a working method thereof, which realizes high-definition imaging and has the advantages of light weight, small size, low distortion and large light aperture.

[0004] The application adopts the scheme that a small unmanned aerial vehicle lens is provided, and the lens is 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 sequentially arranged along the light incident direction.

[0005] Further, the first lens is a positive lens, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; the second lens is a negative lens, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; the third lens is a positive lens, the object side surface of the near-axial region of which is a convex surface, and the image side surface of which is a convex surface; the fourth lens is a negative lens, the object side surface of the near-axial region of which is a concave surface, and the image side surface of which is a convex surface; the fifth lens is a positive lens, the object side surface of the near-axial region of which is a convex surface, and the image side surface of which is a concave surface; the sixth lens is a positive lens, the object side surface of the near-axial region of which is a convex surface, and the image side surface of which is a concave surface; and the seventh lens is a negative lens, the object side surface of the near-axial region of which is a concave surface, and the image side surface of which is a convex surface.

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

[0007] Further, 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] Further, 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; wherein N d is the refractive index, and V d is the Abbe number.

[0009] Further, 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 ratios with respect to 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, and -1.5 < f7 / f < -0.5.

[0010] Further, the plastic aspherical lens curve equation expression is:

[0011]

[0012] wherein Z is the sagittal height of the aspherical surface at a height of h along the optical axis from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface; k is the conic constant; and α1, α2, α3, α4, α5, α6, α7, and α8 are high-order coefficients.

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

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

[0015] A working method of a small drone lens: When light is incident, the light path sequentially enters the first lens, aperture, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens, and finally forms an image on the image plane.

[0016] Compared with existing technologies, this invention has the following advantages: It employs seven lenses—one glass spherical lens and six plastic aspherical lenses—selecting suitable lens materials and combining them with appropriate aspherical surface structures to improve lens resolution and achieve high-definition effects; the first lens is made of glass, improving the lens's scratch resistance; the extensive use of plastic lenses achieves advantages such as lightweight, miniaturization, and low cost; the aperture value is less than F1.6, and the peripheral relative illumination is greater than 50%, providing significant light transmission capability; it has a large imaging target surface, making it compatible with various chips. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the optical structure of the present invention;

[0018] Figure 2 This is the axial chromatic aberration diagram of the entire working band of the present invention;

[0019] Figure 3 This is the transverse chromatic aberration diagram of the entire working band of the present invention;

[0020] Figure 4 This is the field curvature distortion diagram of the entire working band of the present invention.

[0021] In the diagram: L1 - First lens; STO - Aperture stop; L2 - Second lens; L3 - Third lens; L4 - Fourth lens; L5 - Fifth lens; L6 - Sixth lens; L7 - Seventh lens; L8 - Equivalent glass plate; IMA - Imaging plane. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] like Figures 1-4 As shown, a small drone lens is 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 arranged sequentially along the incident direction of light.

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

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

[0026] In the 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 the 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; and the seventh lens satisfies the relationship: N d ≥1.8, V d ≥50.0; wherein N d is the refractive index, and V d is the Abbe number.

[0028] In the 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 ratios: 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, and -1.5 < f7 / f < -0.5.

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

[0030]

[0031] wherein Z is the sagittal height 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 conic constant; and α1, α2, α3, α4, α5, α6, α7 and α8 are high-order coefficients.

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

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

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

[0035] A working method of the small unmanned aerial vehicle lens is as follows: when light is incident, the light path sequentially enters the first lens, the diaphragm, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, and finally forms an image on the image plane.

[0036] The technical indexes achieved by the optical system in the embodiment are as follows:

[0037] (1) focal length: 15≤EFFL≤17mm; (2) aperture F≤1.6; (3) field of view angle: 2w≥60°; (4) working waveband: visible light waveband.

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

[0039]

[0040]

[0041] The aspheric coefficients of the aspheric lenses of the optical system in the embodiment are as shown in the following table:

[0042]

[0043] The optical system of the embodiment realizes the design of light weight, miniaturization, low distortion and large light aperture, and well corrects on-axis and off-axis aberrations, so that the lens has high-definition image quality.

[0044] Any technical solution disclosed in the present application, if not otherwise stated, if a numerical range is disclosed, the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that the preferred numerical range is only one of the many implementable numerical values with more obvious technical effects or representative values. Because there are too many values, it is impossible to enumerate them all, so the present application discloses some values to illustrate the technical solutions of the present application, and the above-mentioned enumerated values should not constitute a limitation on the protection scope of the present application.

[0045] If the words "first", "second", etc. are used to limit the components in this paper, those skilled in the art should know that the use of "first", "second" is only for the convenience of describing the components and distinguishing them, and the above words have no special meaning unless otherwise stated.

[0046] If the present application discloses or involves components or structural parts that are fixedly connected to each other, unless otherwise stated, the fixed connection can be understood as being able to be disassembled and fixedly connected (for example, connected by bolts or screws), or as being understood as being fixedly connected and not being disassembled (for example, riveting, welding), of course, the fixed connection can also be replaced by an integral structure (for example, manufactured by integral forming process) except that it is obviously impossible to use integral forming process.

[0047] In addition, the orientation or position relationship indicated by the above-mentioned any technical solution disclosed in the present application, for example, "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. The orientation or position relationship is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present patent, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the present patent, and the term used to indicate the shape in the above-mentioned any technical solution disclosed in the present application includes shapes similar, similar or close to the shape unless otherwise stated.

[0048] Any component provided by the present application can be assembled from multiple individual components, or can be a single component manufactured by integral forming process.

[0049] It should be pointed out finally that the above examples are only used to illustrate the technical solutions of the present application but not to limit it; although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, which should be covered in the technical solution range claimed by the present application.

Claims

1. A small unmanned aerial vehicle lens characterized by: The lens 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 arranged in sequence along the light incident direction; The first lens is a positive lens, the object side surface of which is a convex surface, and the image side surface is a concave surface; the second lens is a negative lens, the object side surface of which is a convex surface, and the image side surface is a concave surface; the third lens is a positive lens, the object side surface of the near-axial region of which is a convex surface, and the image side surface is a convex surface; the fourth lens is a negative lens, the object side surface of the near-axial region of which is a concave surface, and the image side surface is a convex surface; the fifth lens is a positive lens, the object side surface of the near-axial region of which is a convex surface, and the image side surface is a concave surface; the sixth lens is a positive lens, the object side surface of the near-axial region of which is a convex surface, and the image side surface is a concave surface; the seventh lens is a negative lens, the object side surface of the near-axial region of which is a concave surface, and the image side surface is a convex surface; 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 and f satisfy the following ratios: 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, and -1.5 < f7 / f < -0.5; The total optical length TTL of the lens and the focal length f of the lens satisfy: TTL / f ≤ 1.5; The image height H of the lens and the focal length f of the lens satisfy: H / f ≥ 1.

1. 2.The small unmanned aerial vehicle lens according to claim 1, characterized in that: The first lens is a glass spherical lens, and the other lenses except the first lens are plastic aspherical lenses. 3.The small UAV lens according to claim 1, wherein: 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. 4.The small UAV lens according to claim 1, wherein: 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; wherein N d is the refractive index and V d is the Abbe number.

5. The small drone lens of claim 2, wherein: The curve equation expression of the plastic aspherical lens is: wherein z is the sagittal height of the aspherical surface at a height of h along the optical axis; c is the near-axial curvature of the aspherical surface; r = 1 / c; k is the conic constant; and α1, α2, α3, α4, α5, α6, α7 and α8 are high-order coefficients.

6. A working method of a small unmanned aerial vehicle lens, using the small unmanned aerial vehicle lens according to any one of claims 1-5, characterized in that: When the light is incident, the light path sequentially enters the first lens, the diaphragm, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens, and finally forms an image on the image plane.

Images