Optical aiming system, camera module and electronic device

Abstract

The present invention relates to the field of optical technologies, and particularly to an optical aiming system, a camera module, and an electronic device; the optical aiming system includes a diaphragm and a plurality of lens combinations; the beneficial effects of the present invention are as follows: (1) An optical aiming system is provided, which has a long aiming distance, high measurement accuracy, and a large field of view. It can achieve high-precision measurement within the aiming distance range of 0.5 m to 100 m, the half field of view angle can reach 16°, the blur spots at each field of view angle and each aiming distance are uniform and have good roundness, and the chromatic aberration and spherical aberration are both small; (2) The structure is small and compact, adopting a non-glued separated structure, including 5 lenses, the total length of the system is less than 20 mm, and the maximum clear aperture is less than 10 mm.

Description

Technical Field

[0001] The present invention relates to the field of optical technologies, and particularly to an optical aiming system, a camera module, and an electronic device. Background Art

[0002] In scenarios where a machine is associated with or interferes with other objects during dynamic operation, such as in-air refueling of airplanes, rendezvous and docking of underwater unmanned vehicles, rendezvous and docking of spacecraft, and automatic loading and unloading of goods by large robots, it is necessary to accurately capture the attitude information of the other party in advance for the machine driver to provide decision-making references for achieving rendezvous and docking.

[0003] An optical system composed of optical elements such as lenses and diaphragms in sequence can be used for imaging or other optical information processing. When applying a traditional optical system to attitude capture in the above specific scenarios, there are often problems such as being unable to capture at a long distance and being unable to aim at a short distance. Therefore, it is necessary to develop an optical system with a larger field of view and higher aiming accuracy to meet the need for attitude capture in fast-moving scenarios. Summary of the Invention

[0004] The primary object of the present invention is to provide an optical aiming system with a large field of view and high precision.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] An optical aiming system, sequentially including from the object side to the image side along the optical axis:

[0007] A first lens with positive refractive power, the object side surface of the first lens being convex and the image side surface being concave;

[0008] A second lens with positive refractive power, the object side surface of the second lens being convex and the image side surface being concave;

[0009] A diaphragm;

[0010] A third lens with negative refractive power, the object side surface of the third lens being concave and the image side surface being convex;

[0011] A fourth lens with positive refractive power, the object side surface of the fourth lens being convex and the image side surface being convex;

[0012] A fifth lens with negative refractive power, the object side surface of the fifth lens being concave and the image side surface being convex;

[0013] An image plane.

[0014] The preferred solution of the present invention is that

[0015] The radius of curvature R1 of the object side surface of the first lens on the optical axis is 6.042 mm;

[0016] The radius of curvature R2 of the image side of the first lens on the optical axis is 18.465 mm;

[0017] The radius of curvature R3 of the object side of the second lens on the optical axis is 3.435 mm;

[0018] The radius of curvature R4 of the image side of the second lens on the optical axis is 2.672 mm;

[0019] The radius of curvature R5 of the object side of the third lens on the optical axis is -3.678 mm;

[0020] The radius of curvature R6 of the image side of the third lens on the optical axis is -5.741 mm;

[0021] The radius of curvature R7 of the object side of the fourth lens on the optical axis is 18.363 mm;

[0022] The radius of curvature R8 of the image side of the fourth lens on the optical axis is -10.051 mm;

[0023] The radius of curvature R9 of the object side of the fifth lens on the optical axis is -8.335 mm;

[0024] The radius of curvature R10 of the image side of the fifth lens on the optical axis is -26.172 mm;

[0025] The distance D1 on the optical axis from the image side of the first lens to the object side of the second lens is 0.622 mm;

[0026] The distance D2 on the optical axis from the image side of the second lens to the diaphragm is 1.777 mm;

[0027] The distance D3 on the optical axis from the diaphragm to the object side of the third lens is 1.820 mm;

[0028] The distance D4 on the optical axis from the image side of the third lens to the object side of the fourth lens is 1.987 mm;

[0029] The distance D5 on the optical axis from the image side of the fourth lens to the object side of the fifth lens is 2.710 mm;

[0030] The distance D6 on the optical axis from the image side of the fifth lens to the image plane is 2.705 mm;

[0031] The distance S1 on the optical axis from the object side of the first lens to the image side of the first lens is 1.353 mm;

[0032] The distance S2 from the object side surface to the image side surface of the second lens on the optical axis is 1.042 mm;

[0033] The distance S3 from the object side surface to the image side surface of the third lens on the optical axis is 1.353 mm;

[0034] The distance S4 from the object side surface to the image side surface of the fourth lens on the optical axis is 1.390 mm;

[0035] The distance S5 from the object side surface to the image side surface of the fifth lens on the optical axis is 1.353 mm.

[0036] A preferred embodiment of the present invention is that the object side surface and / or the image side surface of at least one lens in the optical aiming system is a spherical surface.

[0037] A preferred embodiment of the present invention is that the object side surface and / or the image side surface of any lens in the optical aiming system is a spherical surface.

[0038] A preferred embodiment of the present invention is that the aiming range of the optical aiming system is 0.5 m - 100 m.

[0039] A preferred embodiment of the present invention is that the total focal length of the optical aiming system is 15 mm, the F number is 3, and the half field of view angle is 16°.

[0040] A preferred embodiment of the present invention is that the imaging spectrum of the optical aiming system is 800 - 860 nm.

[0041] A preferred embodiment of the present invention is that the diameter of the blur spot of the optical aiming system is ≤80 μm, the offset of the energy center of the blur spot is ≤3 μm, and the alignment accuracy is ≤1'.

[0042] A preferred embodiment of the present invention is that the first lens is made of heavy crown glass N-SK2, the second lens is made of heavy flint glass SF53, the third lens is made of heavy crown glass SK12, the fourth lens is made of lanthanum flint glass LAF4, and the fifth lens is made of heavy lanthanum flint glass LASFN9.

[0043] Another object of the present invention is to provide an imaging module, including the optical aiming system described above.

[0044] Another object of the present invention is to provide an electronic device, including a fixing member and the imaging module described above, and the imaging module is arranged on the fixing member.

[0045] The beneficial effect of the present invention is as follows:

[0046] (1) Provide an optical aiming system with a long aiming distance, high measurement accuracy, and a large field of view angle. It can achieve high-precision measurement within the aiming distance range of 0.5 m to 100 m, with a semi-field of view angle up to 16°. The diffraction spots at each field of view angle and each aiming distance are uniform and have good roundness, and both chromatic aberration and spherical aberration are small.

[0047] (2) It has a small and compact structure, adopting a non-cemented separated structure, including 5 lenses. The total length of the system is less than 20 mm, and the maximum clear aperture is less than 10 mm. Brief Description of the Drawings

[0048] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0049] Figure 2 It is a schematic optical path diagram of an embodiment of the present invention;

[0050] Figure 3 It is a spot diagram of the 0.5 m / 50 m / 100 m aiming distances of an embodiment of the present invention;

[0051] Figure 4 It is a distortion curve of the 0.5 m / 50 m / 100 m of an embodiment of the present invention;

[0052] Figure 5 It is an energy concentration curve of the 0.5 m / 50 m / 100 m of an embodiment of the present invention. Detailed Embodiment

[0053] The following further describes the present invention with reference to embodiments.

[0054] Refer to Figure 1 , an optical aiming system, which sequentially includes, from the object side to the image side along the optical axis:

[0055] A first lens 1 with positive refractive power, the object side surface of the first lens 1 is convex, and the image side surface is concave;

[0056] A second lens 2 with positive refractive power, the object side surface of the second lens 2 is convex, and the image side surface is concave;

[0057] A diaphragm 3;

[0058] A third lens 4 with negative refractive power, the object side surface of the third lens 4 is concave, and the image side surface is convex;

[0059] A fourth lens 5 with positive refractive power, the object side surface of the fourth lens 5 is convex, and the image side surface is convex;

[0060] A fifth lens 6 with negative refractive power, the object side surface of the fifth lens 6 is concave, and the image side surface is convex;

[0061] An image plane 7.

[0062] The lens structure and material of the above optical aiming system are shown in Table 1 below.

[0063] Table 1 Lens Structure and Material of the Optical Aiming System

[0064]

[0065] Note: The curvature radius mentioned refers to the curvature radius of the object side and / or image side of the lens on the optical axis.

[0066] The lens thickness refers to the distance from the object side of the lens to the image side of the lens on the optical axis.

[0067] The air gap represents the distance from the image side of the previous lens to the object side of the next lens on the optical axis.

[0068] The optical aiming system composed of the above structure has achieved the following optical indicators:

[0069] 1. Total focal length = 15 mm;

[0070] 2. Half field of view angle = 16°;

[0071] 3. F number = 3;

[0072] 4. Imaging spectrum = 800 - 860 nm;

[0073] 5. Total system length = 18.11 mm;

[0074] 6. Aiming range = 0.5 m - 100 m.

[0075] 7. Root mean square (RMS) diameter of the blur spot ≤ 80 microns;

[0076] 8. Offset of the energy center of the blur spot ≤ 4 microns;

[0077] 9. Alignment accuracy < 1';

[0078] 10. Maximum clear aperture ≤ 10 mm.

[0079] Refer to Figure 2 , the optical path of this optical aiming system is as follows: The point light source emitted by the target marker passes through the first lens 1, the second lens 2, the aperture 3, the third lens 4, the fourth lens 5, and the fifth lens 6 in sequence at different incident angles and forms a light spot on the image plane 7.

[0080] Define the light intensity distribution of the obtained light spot as the blur spot.

[0081] Figure 3The dot diagram of the dispersion spot formed by the optical aiming system described in this embodiment at aiming distances of 0.5 m, 50 m, and 100 m respectively. It can be seen from the figure that the dispersion spot is approximately circular, with good roundness, basically the same size, uniform, symmetric, and the root mean square (RMS) diameter of the light spot and the corresponding offset of the detector energy center meet the requirements of the attitude measurement accuracy.

[0082] Figure 4 The distortion curve of the optical aiming system described in this embodiment at aiming distances of 0.5 m, 50 m, and 100 m respectively. It can be seen from the figure that the relative distortion at each aiming distance is less than 0.1%.

[0083] Figure 5 The energy concentration curve of the centroid of the dispersion spot of the optical aiming system described in this embodiment at aiming distances of 0.5 m, 50 m, and 100 m respectively. It can be seen from the figure that the energy concentration within a diameter of 90 microns is greater than 90%, and the energy concentration within a diameter of 75 microns is greater than 80%.

Claims

1. An optical aiming system, characterized in that, It consists of the following components in sequence from the object side to the image side along the optical axis: A first lens with positive refractive power, the object side surface of the first lens being convex and the image side surface being concave; A second lens with positive refractive power, the object side surface of the second lens being convex and the image side surface being concave; A diaphragm; A third lens with negative refractive power, the object side surface of the third lens being concave and the image side surface being convex; A fourth lens with positive refractive power, the object side surface of the fourth lens being convex and the image side surface being convex; A fifth lens with negative refractive power, the object side surface of the fifth lens being concave and the image side surface being convex; An image plane; The material used for the first lens is heavy crown glass N-SK2, the material used for the second lens is heavy flint glass SF53, the material used for the third lens is heavy crown glass SK12, the material used for the fourth lens is lanthanum flint glass LAF4, and the material used for the fifth lens is heavy lanthanum flint glass LASFN9; The radius of curvature R1 of the object side surface of the first lens on the optical axis = 6.042 mm; the radius of curvature R2 of the image side surface of the first lens on the optical axis = 18.465 mm; the radius of curvature R3 of the object side surface of the second lens on the optical axis = 3.435 mm; the radius of curvature R4 of the image side surface of the second lens on the optical axis = 2.672 mm; the radius of curvature R5 of the object side surface of the third lens on the optical axis = -3.678 mm; the radius of curvature R6 of the image side surface of the third lens on the optical axis = -5.741 mm; the radius of curvature R7 of the object side surface of the fourth lens on the optical axis = 18.363 mm; the radius of curvature R8 of the image side surface of the fourth lens on the optical axis = -10.051 mm; the radius of curvature R9 of the object side surface of the fifth lens on the optical axis = -8.335 mm; the radius of curvature R10 of the image side surface of the fifth lens on the optical axis = -26.172 mm; The distance D1 from the image side surface of the first lens to the object side surface of the second lens on the optical axis = 0.622 mm; The distance D2 from the image side surface of the second lens to the diaphragm on the optical axis = 1.777 mm; The distance D3 from the diaphragm to the object side surface of the third lens on the optical axis = 1.820 mm; The distance D4 from the image side surface of the third lens to the object side surface of the fourth lens on the optical axis = 1.987 mm; The distance D5 from the image side surface of the fourth lens to the object side surface of the fifth lens on the optical axis = 2.710 mm; The distance D6 from the image side surface of the fifth lens to the image plane on the optical axis = 2.705 mm; The distance S1 from the object side surface of the first lens to the image side surface of the first lens on the optical axis = 1.353 mm; The distance S2 from the object side surface of the second lens to the image side surface of the second lens on the optical axis = 1.042 mm; The distance S3 from the object side surface of the third lens to the image side surface of the third lens on the optical axis = 1.353 mm; The distance S4 from the object side surface of the fourth lens to the image side surface of the fourth lens on the optical axis = 1.390 mm; The distance S5 from the object side surface to the image side surface of the fifth lens on the optical axis is 1.353 mm; The object side surface and / or the image side surface of any lens in the optical aiming system is / are spherical surfaces; The aiming range of the optical aiming system is 0.5 m - 100 m; The total focal length of the optical aiming system is 15 mm, the F number is 3, and the half field of view angle is 16°; The imaging spectrum of the optical aiming system is 800 - 860 nm; The diameter of the blur spot of the optical aiming system is ≤ 80 microns, the offset of the energy center of the blur spot is ≤ 3 microns, and the alignment accuracy is ≤ 1'; 2. An imaging module, characterized in that, Comprising the optical aiming system according to claim 1.

3. An electronic device, characterized in that, Comprising a fixing member and the camera module according to claim 2, the camera module being arranged on the fixing member.

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