400-1000nm high-precision large-aperture hyperspectral imaging lens

Abstract

The utility model discloses a 400-1000nm high-precision large-aperture hyperspectral imaging lens comprising a lens main body and a micro lens array, the rear end of the micro lens array is provided with an image plane, the lens main body is located at the front end of the micro lens array, and the rear end of the micro lens array is provided with an image plane. The lens body comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a glued lens and a seventh lens, the glued lens is located at the front end of the seventh lens, the sixth lens is located at the front end of the glued lens, the fifth lens is located at the front end of the sixth lens, and the diaphragm is located at the front end of the seventh lens. The fourth lens is located at the front end of the fifth lens. According to the 400-1000nm high-precision large-aperture hyperspectral imaging lens, a specific lens structure, material matching and the micro lens array are adopted, so that the lens is large in view field, small in size, high in full-view-field resolution capability, large in aperture, high in manufacturing yield and low in chromatic aberration, and distortion is close to zero.

Description

Technical Field

[0001] This utility model relates to the field of hyperspectral imaging lens technology, and in particular to a high-precision, large-aperture hyperspectral imaging lens with a wavelength of 400–1000 nm. Background Technology

[0002] High-precision, large-aperture hyperspectral imaging technology is based on a large number of narrow-band image data technologies. It combines imaging technology with spectral technology to detect the two-dimensional geometric space and one-dimensional spectral information of the target, and acquire continuous, narrow-band image data with high spectral resolution. With the continuous development of science and technology, people have increasingly higher requirements for the manufacturing process of high-precision, large-aperture hyperspectral imaging lenses.

[0003] Existing high-precision, large-aperture hyperspectral imaging lenses have certain drawbacks in use. Most hyperspectral cameras currently use grating beam splitting, which generally suffers from weak resolution, especially at the edges of the field of view. At the same time, the small aperture results in less light intake. A few hyperspectral cameras use an offner structure, but the convex grating is difficult to manufacture and has a low yield. To address these issues, we propose a high-precision, large-aperture hyperspectral imaging lens for the 400–1000 nm range. Utility Model Content

[0004] Technical problem to be solved: In view of the shortcomings of the existing technology, this utility model provides a high-precision large-aperture hyperspectral imaging lens of 400-1000nm. It adopts a specific lens structure, material combination and microlens array, so that the lens has a large field of view, small size, strong full field of view resolution, large aperture, high manufacturing yield, low chromatic aberration and distortion close to 0, which can effectively solve the problems in the background technology.

[0005] Technical Solution: To achieve the above objectives, the technical solution adopted by this utility model is as follows: a 400-1000nm high-precision large-aperture hyperspectral imaging lens, comprising a lens body and a microlens array, wherein an image plane is provided at the rear end of the microlens array, the lens body is located at the front end of the microlens array, the lens body includes a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, a cemented lens, and a seventh lens, wherein the cemented lens is located at the front end of the seventh lens, the sixth lens is located at the front end of the cemented lens, the fifth lens is located at the front end of the sixth lens, the fourth lens is located at the front end of the fifth lens, the aperture stop is located between the third lens and the fourth lens, the second lens is located at the front end of the third lens, and the first lens is located at the front end of the second lens.

[0006] Preferably, the seventh lens includes an anti-reflective coating, an upper adhesive coating, a lower adhesive coating, a lens sheet, a light-transmitting coating, and a base film. The lower adhesive coating is located on the surface of the base film, the light-transmitting coating is located on the surface of the lower adhesive coating, the upper adhesive coating is located on the surface of the light-transmitting coating, the lens sheet is located on the surface of the upper adhesive coating, and the anti-reflective coating is located on the surface of the lens sheet.

[0007] Preferably, the lens body and the microlens array form a hyperspectral camera, and a microlens array beam-splitting structure is adopted, with the microlens array placed in front of the image to decompose the spectrum.

[0008] Preferably, the working F-number of the lens body is 1.2, the lateral chromatic aberration of the lens body reaches the 1µm level, the distortion of the lens body is <0.5%, and the spectral splitting does not overlap, and the field of view of the lens body reaches 80°.

[0009] Preferably, the hyperspectral camera composed of the lens body and the microlens array uses a wavelength range of 400nm to 1000nm.

[0010] Preferably, the antireflective film, lens, upper adhesive film, light-transmitting film, lower adhesive film, and base film are integrally formed by free-form surface processing.

[0011] Beneficial Effects: Compared with the prior art, this utility model provides a 400-1000nm high-precision large-aperture hyperspectral imaging lens, which has the following beneficial effects: This 400-1000nm high-precision large-aperture hyperspectral imaging lens adopts a specific lens structure, material combination, and microlens array, making the lens have a large field of view, small size, strong full-field resolution, large aperture, high manufacturing yield, low chromatic aberration, and near-zero distortion. It operates in the 400nm-1000nm wavelength range and uses a microlens array for beam splitting. The hyperspectral camera consists of a lens and a microlens array, with a lens placed in front of the image. A microlens array is used to decompose the spectrum, effectively reducing the degradation of image quality after beam splitting; the lens operates at an F-number of 1.2, and the large aperture ensures sufficient light intake, allowing the product to run analysis at a higher frame rate; the lens material uses a combination of crown flint glass, which can effectively eliminate chromatic aberration, allowing the lens to achieve a lateral chromatic aberration level of 1µm; lens distortion is <0.5%, preventing overlap of spectral bands; the lens has a field of view of 80°, meeting the usage requirements of all major environments. The entire high-precision, large-aperture hyperspectral imaging lens has a simple structure, is easy to operate, and performs better than traditional methods. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a 400-1000nm high-precision large-aperture hyperspectral imaging lens according to this utility model.

[0013] Figure 2This is a schematic diagram of the microlens array in a high-precision, large-aperture hyperspectral imaging lens with a wavelength of 400-1000 nm according to this utility model.

[0014] Figure 3 This is a schematic diagram of the main body of the lens in a 400-1000nm high-precision large-aperture hyperspectral imaging lens of this utility model.

[0015] Figure 4 This is a schematic diagram of the structure of the seventh lens in a high-precision, large-aperture hyperspectral imaging lens for 400-1000nm.

[0016] Figure 5 This is a structural schematic diagram of the radius and thickness of a component in a 400-1000nm high-precision large-aperture hyperspectral imaging lens according to this utility model.

[0017] Figure 6 This is a schematic diagram of the MTF result image in a high-precision, large-aperture hyperspectral imaging lens for 400-1000nm.

[0018] Figure 7 This is a structural schematic diagram of the distortion result image in a high-precision, large-aperture hyperspectral imaging lens with a wavelength of 400-1000 nm according to this utility model.

[0019] Figure 8 This is a schematic diagram of the lateral chromatic aberration pattern in a 400-1000nm high-precision large-aperture hyperspectral imaging lens according to the present invention.

[0020] In the diagram: 1. First lens; 2. Second lens; 3. Third lens; 4. Aperture; 5. Fourth lens; 6. Fifth lens; 7. Sixth lens; 8. Cemented lens; 9. Seventh lens; 10. Microlens array; 11. Image plane; 12. Anti-reflective coating; 13. Upper adhesive coating; 14. Lower adhesive coating; 15. Lens sheet; 16. Transmitting coating; 17. Base film. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are only some embodiments of this utility model, not all embodiments, and are only used to illustrate this utility model, and should not be regarded as limiting the scope of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1-8 As shown, a high-precision, large-aperture hyperspectral imaging lens with a resolution of 400–1000 nm includes a lens body and a microlens array 10. An image plane 11 is provided at the rear end of the microlens array 10. The lens body is located at the front end of the microlens array 10. The lens body includes a first lens 1, a second lens 2, a third lens 3, an aperture 4, a fourth lens 5, a fifth lens 6, a sixth lens 7, a cemented lens 8, and a seventh lens 9. The cemented lens 8 is located at the front end of the seventh lens 9, the sixth lens 7 is located at the front end of the cemented lens 8, the fifth lens 6 is located at the front end of the sixth lens 7, the fourth lens 5 is located at the front end of the fifth lens 6, the aperture 4 is located between the third lens 3 and the fourth lens 5, the second lens 2 is located at the front end of the third lens 3, and the first lens 1 is located at the front end of the second lens 2. By employing a specific lens structure, material combination, and microlens array, the lens has a large field of view, small size, strong full-field resolution, large aperture, high manufacturing yield, low chromatic aberration, and distortion close to 0.

[0025] Furthermore, the seventh lens 9 includes an anti-reflective coating 12, an upper adhesive coating 13, a lower adhesive coating 14, a lens sheet 15, a light-transmitting coating 16, and a base film 17. The lower adhesive coating 14 is located on the surface of the base film 17, the light-transmitting coating 16 is located on the surface of the lower adhesive coating 14, the upper adhesive coating 13 is located on the surface of the light-transmitting coating 16, the lens sheet 15 is located on the surface of the upper adhesive coating 13, and the anti-reflective coating 12 is located on the surface of the lens sheet 15.

[0026] Furthermore, the lens body and the microlens array 10 form a hyperspectral camera, and a microlens array beam splitting structure is adopted, with the microlens array 10 placed in front of the image plane 11 to decompose the spectrum.

[0027] Furthermore, the lens body has a working F-number of 1.2, the lateral chromatic aberration of the lens body reaches the 1µm level, the lens body distortion is <0.5%, and the spectral splitting does not overlap, with the lens body field of view reaching 80°.

[0028] Furthermore, the hyperspectral camera composed of the lens body and the microlens array 10 uses a wavelength range of 400nm to 1000nm.

[0029] Furthermore, the antireflective film 12, lens 15, upper adhesive film 13, light-transmitting film 16, lower adhesive film 14, and base film 17 are integrally formed through free-form surface processing.

[0030] Working principle: This utility model includes a first lens 1, a second lens 2, a third lens 3, an aperture 4, a fourth lens 5, a fifth lens 6, a sixth lens 7, a cemented lens 8, a seventh lens 9, a microlens array 10, an image plane 11, an anti-reflective coating 12, an upper adhesive film 13, a lower adhesive film 14, a lens sheet 15, a light-transmitting film 16, and a base film 17. It operates in the wavelength range of 400nm to 1000nm and employs a microlens array for spectral splitting. The hyperspectral camera consists of a lens and a microlens array. The microlens array is placed in front of the image plane to decompose the spectrum, effectively reducing the image quality degradation after spectral splitting. In low-light conditions; the lens operates at an F-number of 1.2, and the large aperture ensures sufficient light intake, allowing the product to run analysis at a higher frame rate; the lens material uses a combination of crown flint glass, which can effectively eliminate chromatic aberration, allowing the lens's lateral chromatic aberration to reach the 1µm level; lens distortion is <0.5%, preventing overlap in spectral splitting; the lens has a field of view of 80°, meeting the usage requirements of all major environments; it adopts a specific lens structure, material combination, and microlens array, resulting in a large field of view, small size, strong full-field resolution, large aperture, high manufacturing yield, low chromatic aberration, and distortion close to 0.

[0031] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A high-precision, large-aperture hyperspectral imaging lens for 400–1000 nm, comprising a lens body and a microlens array (10), characterized in that: The microlens array (10) has an image plane (11) at its rear end. The lens body is located at the front end of the microlens array (10). The lens body includes a first lens (1), a second lens (2), a third lens (3), an aperture stop (4), a fourth lens (5), a fifth lens (6), a sixth lens (7), a cemented lens (8), and a seventh lens (9). The cemented lens (8) is located at the front end of the seventh lens (9). The sixth lens (7) is located at the front end of the cemented lens (8). The fifth lens (6) is located at the front end of the sixth lens (7). The fourth lens (5) is located at the front end of the fifth lens (6). The aperture stop (4) is located between the third lens (3) and the fourth lens (5). The second lens (2) is located at the front end of the third lens (3). The first lens (1) is located at the front end of the second lens (2).

2. The 400-1000nm high-precision large-aperture hyperspectral imaging lens according to claim 1, characterized in that: The seventh lens (9) includes an anti-reflective coating (12), an upper adhesive film (13), a lower adhesive film (14), a lens sheet (15), a light-transmitting film (16), and a base film (17). The lower adhesive film (14) is located on the surface of the base film (17), the light-transmitting film (16) is located on the surface of the lower adhesive film (14), the upper adhesive film (13) is located on the surface of the light-transmitting film (16), the lens sheet (15) is located on the surface of the upper adhesive film (13), and the anti-reflective coating (12) is located on the surface of the lens sheet (15).

3. The 400-1000nm high-precision large-aperture hyperspectral imaging lens according to claim 1, characterized in that: The lens body and the microlens array (10) form a hyperspectral camera, and a microlens array beam splitting structure is adopted. The microlens array (10) is placed in front of the image plane (11) to decompose the spectrum.

4. The 400-1000nm high-precision large-aperture hyperspectral imaging lens according to claim 1, characterized in that: The lens body has an operating F-number of 1.2, a lateral chromatic aberration of 1µm, a distortion of <0.5%, and no overlap in spectral dispersion. The lens body has a field of view of 80°.

5. A high-precision, large-aperture hyperspectral imaging lens for 400-1000nm according to claim 1, characterized in that: The hyperspectral camera composed of the lens body and the microlens array (10) uses a wavelength range of 400nm to 1000nm.

6. A high-precision, large-aperture hyperspectral imaging lens for 400-1000nm according to claim 2, characterized in that: The antireflective film (12), lens (15), upper adhesive film (13), light-transmitting film (16), lower adhesive film (14) and base film (17) are integrally formed by free-form surface processing.

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