An infrared optical system for a high overload seeker

Abstract

The utility model relates to optical technology field especially relates to a kind of high overload seeker infrared optical systems, including first lens, second lens and third lens, first lens, second lens and third lens are sequentially spaced apart along optical axis from object side to image side, first lens is the crescent lens of convex surface towards object side, second lens is the crescent lens of convex surface towards first lens, third lens is the crescent lens of convex surface towards second lens;System diaphragm is set on the front surface of second lens, in this way, the technical problem that high overload environment in prior art is extremely easy to lead to the deformation of the internal support structure of seeker and the damage of various optical elements, even lead to the technical problem of failure of guidance system is solved.

Description

Technical Field

[0001] This utility model relates to the field of optical technology, and in particular to a high overload seeker infrared optical system. Background Technology

[0002] The development and application of information technology have spurred the research and development of guided artillery shells by major military powers worldwide. These new types of shells include television reconnaissance shells, laser-guided projectiles, television-guided projectiles, and terminally guided projectiles. Compared to traditional munitions, the new guided projectiles have a more complex structure, with various photoelectric sensors and micro-optical components inside the seeker.

[0003] When artillery fires, the projectile is subjected to the pressure inside the barrel, resulting in a high acceleration. This forces the seeker to withstand enormous instantaneous high-energy impact loads. However, such high overload environments can easily cause deformation of the seeker's internal support structure and damage to various optical components, and may even lead to the failure of the guidance system. Utility Model Content

[0004] The purpose of this invention is to provide a high overload seeker infrared optical system, which aims to solve the technical problem that high overload environments can easily lead to deformation of the internal support structure of the seeker and damage to various optical components, and even cause the guidance system to fail.

[0005] To achieve the above objectives, this utility model employs a high overload seeker infrared optical system, comprising a first lens, a second lens, and a third lens. The first lens, the second lens, and the third lens are arranged sequentially from the object side to the image side along the optical axis. The first lens is a meniscus lens with its convex surface facing the object side, the second lens is a meniscus lens with its convex surface facing the first lens, and the third lens is a meniscus lens with its convex surface facing the second lens. The system aperture is disposed on the front surface of the second lens.

[0006] The high overload seeker infrared optical system has a relative aperture of 1.1 and a system focal length of 36mm, and is used for an infrared detector with a resolution of 640*512 and pixel sizes of 12μm and 17μm.

[0007] Wherein, the front surface of the first lens is R1 and the rear surface is R2; the front surface of the second lens is R3 and the rear surface is R4; and the front surface of the third lens is R5 and the rear surface is R6.

[0008] With the optical axis Z as the central optical axis, along the optical axis Z from the object side to the image side, the distance D1 from R1 to R2 is 3.6 mm, the distance D2 from R2 to R3 is 3.08 mm, the distance D3 from R3 to R4 is 6.15 mm, the distance D4 from R4 to R5 is 21.45 mm, the distance D5 from R5 to R6 is 3.6 mm, and the distance D6 from R6 to the image plane is 9.43 mm.

[0009] Wherein, the rear surface R2 of the first lens, the front surface R5 of the third lens, and the rear surface R6 of the third lens are even-order aspherical surfaces with radii of curvature of 53.126 mm, 33.487 mm, and 26.552 mm, respectively; the spherical radius of the front surface R1 of the first lens is 55.55 mm; the spherical radius of the front surface R3 of the second lens is 25.78 mm; and the rear surface R4 of the second lens is a binary surface with a radius of curvature of 33.487 mm.

[0010] The first lens is made of germanium glass, the second lens is made of chalcogenide glass, and the third lens is made of germanium glass.

[0011] This invention discloses a high-overload seeker infrared optical system. A first lens, a second lens, and a third lens are sequentially arranged along the optical axis from the object side to the image side. The first lens is a meniscus lens with its convex surface facing the object side; the second lens is a meniscus lens with its convex surface facing the first lens; and the third lens is a meniscus lens with its convex surface facing the second lens. The system aperture is located on the front surface of the second lens, employing a combination of aspherical and binary surfaces to reduce the difficulty of pyrolysis. Simultaneously, the compact structure improves the lens's impact resistance, enabling it to meet the requirements of high-overload environments. This approach solves the technical problem in existing technologies where high-overload environments easily lead to deformation of the seeker's internal support structure and damage to various optical components, even causing the guidance system to fail. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of the high overload seeker infrared optical system of this utility model.

[0014] Figure 2 This is a diagram showing the vertical aberration curve of the high overload seeker infrared optical system of this utility model.

[0015] Figure 3 This is an astigmatism curve of the high overload seeker infrared optical system of this utility model.

[0016] Figure 4 This is a distortion curve diagram of the high overload seeker infrared optical system of this utility model.

[0017] Figure 5 This is a modulation transfer function curve of the high overload seeker infrared optical system of this utility model.

[0018] 1-First lens, 2-Second lens, 3-Third lens. Detailed Implementation

[0019] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0020] Please see Figures 1-5 ,in Figure 1 This is a schematic diagram of the structure of the high overload seeker infrared optical system of this utility model. Figure 2 This is a diagram showing the vertical aberration curve of the high overload seeker infrared optical system of this utility model. Figure 3 This is an astigmatism curve of the high overload seeker infrared optical system of this utility model. Figure 4 This is a distortion curve diagram of the high overload seeker infrared optical system of this utility model. Figure 5 This is a modulation transfer function curve of the high overload seeker infrared optical system of this utility model.

[0021] This invention provides a high overload seeker infrared optical system, including a first lens 1, a second lens 2, and a third lens 3. The first lens 1, the second lens 2, and the third lens 3 are arranged sequentially from the object side to the image side along the optical axis. The first lens 1 is a meniscus lens with its convex surface facing the object side, the second lens 2 is a meniscus lens with its convex surface facing the first lens 1, and the third lens 3 is a meniscus lens with its convex surface facing the second lens 2. The system aperture is disposed on the front surface of the second lens 2.

[0022] The front surface of the first lens 1 is R1 and the rear surface is R2; the front surface of the second lens 2 is R3 and the rear surface is R4; the front surface of the third lens 3 is R5 and the rear surface is R6.

[0023] With the optical axis Z as the central optical axis, along the optical axis Z from the object side to the image side, the distance D1 from R1 to R2 is 3.6 mm, the distance D2 from R2 to R3 is 3.08 mm, the distance D3 from R3 to R4 is 6.15 mm, the distance D4 from R4 to R5 is 21.45 mm, the distance D5 from R5 to R6 is 3.6 mm, and the distance D6 from R6 to the image plane is 9.43 mm.

[0024] The rear surface R2 of the first lens 1, the front surface R5 of the third lens 3, and the rear surface R6 of the third lens 3 are even-order aspherical surfaces with radii of curvature of 53.126 mm, 33.487 mm, and 26.552 mm, respectively. The spherical radius of the front surface R1 of the first lens 1 is 55.55 mm, the spherical radius of the front surface R3 of the second lens 2 is 25.78 mm, and the rear surface R4 of the second lens 2 is a binary surface with a radius of curvature of 33.487 mm.

[0025] The first lens 1 is made of germanium glass, the second lens 2 is made of chalcogenide glass, and the third lens 3 is made of germanium glass.

[0026] In this specific embodiment, the first lens 1, the second lens 2, and the third lens 3 are arranged sequentially from the object side to the image side along the optical axis. The first lens 1 is a meniscus lens with its convex surface facing the object side, the second lens 2 is a meniscus lens with its convex surface facing the first lens 1, and the third lens 3 is a meniscus lens with its convex surface facing the second lens 2. The system aperture is set on the front surface of the second lens 2, and the combination of aspherical and binary surfaces reduces the difficulty of pyrolysis. At the same time, the structure is compact, which improves the impact resistance of the lens and enables it to meet the requirements of high overload environments. In this way, the technical problem in the prior art that high overload environments can easily lead to deformation of the internal support structure of the seeker and damage to various optical components, and even failure of the guidance system.

[0027] The high overload seeker infrared optical system has a relative aperture of 1.1 and a system focal length of 36mm, and is suitable for infrared detectors with a resolution of 640*512 and pixel sizes of 12μm and 17μm.

[0028] The binary surface conforms to the following formula:

[0029]

[0030] In the formula, Let M be the phase, M be the diffraction order (1), ρ be the normalized radius (1 mm), B1 = -0.1675, and B2 = -5.883E-005.

[0031] The specific parameters of the visible light optical system in the high overload seeker infrared optical system are shown in Table 1:

[0032]

[0033] The even-order aspherical surface satisfies the following expression:

[0034]

[0035] In the formula, Z: displacement along the optical axis, Y: height of the optical axis, r: paraxial radius of curvature, K: conic coefficient, and A, B, C, D, E, and F are aspherical coefficients.

[0036] Aspherical coefficients are shown in Table 2:

[0037]

[0038] The infrared optical system for a high overload seeker according to this invention involves sequentially arranging the first lens 1, the second lens 2, and the third lens 3 along the optical axis from the object side to the image side. The first lens 1 is a meniscus lens with its convex surface facing the object side, the second lens 2 is a meniscus lens with its convex surface facing the first lens 1, and the third lens 3 is a meniscus lens with its convex surface facing the second lens 2. The system aperture is located on the front surface of the second lens 2, employing a combination of aspherical and binary surfaces to reduce the difficulty of pyrolysis. Simultaneously, the compact structural design improves the lens's impact resistance, enabling it to meet the requirements of high overload environments. This approach solves the technical problem in the prior art where high overload environments easily lead to deformation of the internal support structure of the seeker and damage to various optical components, even causing the guidance system to fail.

[0039] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A high overload seeker infrared optical system, characterized in that, It includes a first lens, a second lens, and a third lens, which are arranged sequentially from the object side to the image side along the optical axis. The first lens is a meniscus lens with its convex surface facing the object side, the second lens is a meniscus lens with its convex surface facing the first lens, and the third lens is a meniscus lens with its convex surface facing the second lens. The system aperture is disposed on the front surface of the second lens. The relative aperture of the high overload seeker infrared optical system is 1.1, the system focal length is 36mm, and it is used for an infrared detector with a resolution of 640*512 and pixel sizes of 12μm and 17μm. The first lens has a front surface of R1 and a rear surface of R2; the second lens has a front surface of R3 and a rear surface of R4; and the third lens has a front surface of R5 and a rear surface of R6. With the optical axis Z as the central optical axis, along the optical axis Z from the object side to the image side, the distance D1 from R1 to R2 is 3.6 mm, the distance D2 from R2 to R3 is 3.08 mm, the distance D3 from R3 to R4 is 6.15 mm, the distance D4 from R4 to R5 is 21.45 mm, the distance D5 from R5 to R6 is 3.6 mm, and the distance D6 from R6 to the image plane is 9.43 mm. The rear surface R2 of the first lens, the front surface R5 of the third lens, and the rear surface R6 of the third lens are even-order aspherical surfaces with radii of curvature of 53.126 mm, 33.487 mm, and 26.552 mm, respectively. The spherical radius of the front surface R1 of the first lens is 55.55 mm, the spherical radius of the front surface R3 of the second lens is 25.78 mm, and the rear surface R4 of the second lens is a binary surface with a radius of curvature of 33.487 mm. The first lens is made of germanium glass, the second lens is made of chalcogenide glass, and the third lens is made of germanium glass.

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