Ultra-thin short-focus lens device for intelligent water meter

Abstract

The utility model relates to the technical field of lenses, and discloses an ultra-thin short-focus lens device for an intelligent water meter, which comprises a pressing cap, a first lens sheet, a second lens sheet and a third lens sheet are sequentially arranged in an inner cavity of the pressing cap from an object side to an image side, and an infrared optical filter is arranged on the image side of the third lens sheet; through the cooperation of the first lens sheet, the second lens sheet and the third lens sheet, the image side of the first lens sheet and the object side of the second lens sheet are arranged at an interval of the first gasket, the image side of the second lens sheet and the object side of the third lens sheet are arranged at an interval of the second gasket, and through the shape design of the lenses, the overall number of used lenses of the lens is reduced; therefore, the space occupied by the whole lens is reduced, the whole lens can be used in the intelligent water meter conveniently, the intelligent water meter is suitable for being used in most small spaces, the whole application range of the lens is widened, and the good picture projection effect is guaranteed under the condition that the machining cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lenses, in particular to an ultra-thin short-focus lens device for an intelligent water meter. Background Technique

[0002] In the field of machine vision, as the "eyeglasses" for machine vision to obtain target images, the performance of optical lenses determines whether the machine vision system can meet the application requirements. At the same time, with the continuous development of machine vision, the requirements for optical lenses are getting higher and higher. Generally, it is necessary to balance elements such as high resolution, good aberration correction, low distortion, and large field of view;

[0003] In the prior art, a Chinese invention with the application number: CN202211045215.6 discloses a short-focus lens, which includes, in order from the object side to the image side: a first lens with a positive optical power, a second lens with a negative optical power; a third lens with a negative optical power; a fourth lens with a negative optical power; a fifth lens with a positive optical power and forming a doublet lens with the fourth lens; a sixth lens with a positive optical power; a seventh lens with a positive optical power and spaced from the sixth lens; a diaphragm STO, spaced from the seventh lens and used to limit the beam aperture; an eighth lens with a positive optical power; a ninth lens with a positive optical power and spaced from the eighth lens; a tenth lens with a negative optical power and forming a doublet lens with the ninth lens. This technical solution realizes high pixels, low distortion, and relative illumination by reasonably distributing the optical power of the lenses, reasonably selecting materials, and using all-glass spherical lenses. At the same time, by using a smaller number of lenses and a simple structure, the volume of the lens is miniaturized;

[0004] Although the above technical solution miniaturizes the volume of the lens, however, the number of lenses used in this technical solution is relatively large, and the stacking of multiple lenses results in a relatively large overall height. The installation space of some intelligent water meters is limited, resulting in inconvenient use of the lens in some narrow spaces and reducing the range of applicable sites. Therefore, we need to propose an ultra-thin short-focus lens device for an intelligent water meter. Content of the Utility Model

[0005] The purpose of the utility model is to provide an ultra-thin short-focus lens device for an intelligent water meter, which reduces the space occupied by the overall lens during installation by reducing the number of lenses, so that the lens can be applied to the intelligent water meter, and improves the range of applicable sites for lens installation, so as to solve the problems raised in the above background technique.

[0006] To achieve the above object, the present utility model provides the following technical solution: A thin and short-focus lens device for an intelligent water meter, including a compression cap, wherein a first lens, a second lens, and a third lens are sequentially arranged in the inner cavity of the compression cap from the object side to the image side, and an infrared filter is arranged on the image side of the third lens;

[0007] The object side surface of the first lens is aspherical, the image side surface of the first lens is concave, and the first lens is a plano-concave lens;

[0008] The object side surface of the second lens is convex, the image side surface of the second lens is concave, and the second lens is a convex-concave lens;

[0009] The object side surface of the third lens is aspherical, the image side surface of the third lens is convex, and the third lens is a convex-convex lens.

[0010] Preferably, a housing is snap-connected to the outside of the compression cap. The object side of the housing is cylindrical, and the image side of the housing is square-tubular.

[0011] By adopting the above technical solution, the fixing effect on the first lens, the second lens, and the third lens is improved, and the overall service life is increased.

[0012] Preferably, a circular plate is integrally formed on the object side of the compression cap, and semi-circular holes are equiangularly opened on the outside of the circular plate, and the radii of multiple groups of semi-circular holes are the same.

[0013] By adopting the above technical solution, the semi-circular holes are used to facilitate the convenient installation of the compression cap.

[0014] Preferably, a first gasket is arranged on the image side of the first lens, and the first gasket is arranged on the object side of the second lens.

[0015] By adopting the above technical solution, the first gasket can prevent the first lens and the second lens from touching and being damaged, and at the same time, the first gasket is used to facilitate the adjustment of the distance between the first lens and the second lens.

[0016] Preferably, a second gasket is arranged on the image side of the second lens, the second gasket is arranged on the object side of the third lens, a third gasket is arranged on the image side of the third lens, and the third gasket is arranged on the object side of the infrared filter.

[0017] By adopting the above technical solution, the second gasket is used to prevent abrasion between the second lens and the third lens, reduce the influence on imaging, and at the same time increase the service life of the lens.

[0018] Preferably, the outer diameter of the first lens is smaller than that of the second lens, and the outer diameter of the second lens is smaller than that of the third lens.

[0019] By adopting the above technical solution, due to the different radii, the first lens, the second lens and the third lens can be fitted with the pressing cap during installation, improving the stability of the stacked installation of the first lens, the second lens and the third lens.

[0020] Preferably, the first lens, the second lens and the third lens are all plastic lenses, the pressing cap is a hard plastic sleeve, and the housing is a metal shell.

[0021] By adopting the above technical solution, the production cost is reduced, the protection effect on the first lens, the second lens and the third lens is improved, and the overall installation is convenient and the service life is long.

[0022] Compared with the prior art, the beneficial effects of the present utility model are:

[0023] The present utility model mainly through the cooperation between the first lens, the second lens and the third lens, the image side of the first lens is spaced from the object side of the second lens by a first spacer, and the image side of the second lens is spaced from the object side of the third lens by a second spacer. Through the shape design of the lenses, the overall number of lens used in the lens is reduced, thereby reducing the space occupied by the overall lens, so as to facilitate the overall lens to be used inside the intelligent water meter and be applicable to most small spaces, improving the overall applicable range of the lens and ensuring a good picture projection effect while reducing the processing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0025] Figure 2 is a front view structural schematic diagram of the present utility model;

[0026] Figure 3 is a partial cross-sectional side view structural schematic diagram of the present utility model;

[0027] Figure 4 is a rear view structural schematic diagram of the present utility model;

[0028] Figure 5 is a cross-sectional structural schematic diagram of the present utility model.

[0029] In the figure: 1, pressing cap; 2, first lens; 3, first spacer; 4, second lens; 5, second spacer; 6, third lens; 7, third spacer; 8, infrared filter; 9, housing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Please refer to Figures 1-5 , the present invention provides a technical solution: a ultra-thin short-focus lens device for an intelligent water meter, including a compression cap 1. Inside the compression cap 1, a first lens 2, a second lens 4, and a third lens 6 are sequentially arranged from the object side to the image side. An infrared filter 8 is arranged on the image side of the third lens 6;

[0032] The object side surface of the first lens 2 is aspherical, and the image side surface of the first lens 2 is concave. The first lens 2 is a plano-concave lens;

[0033] The object side surface of the second lens 4 is convex, and the image side surface of the second lens 4 is concave. The second lens 4 is a convex-concave lens;

[0034] The object side surface of the third lens 6 is aspherical, and the image side surface of the third lens 6 is convex. The third lens 6 is a convex-convex lens.

[0035] The outer side of the compression cap 1 is snap-connected with a housing 9. The object side of the housing 9 is cylindrical, and the image side of the housing 9 is square tubular. The housing 9 improves the protection effect on the compression cap 1, avoids damage to the compression cap 1, and thus ensures the overall service life of the lens.

[0036] A circular plate is integrally formed on the object side of the compression cap 1, and semi-circular holes are equiangularly opened on the outer side of the circular plate. The radii of multiple groups of semi-circular holes are the same. The compression cap 1 facilitates the overall installation and fixation through the semi-circular holes, and improves the convenience of disassembly and assembly.

[0037] A first gasket 3 is arranged on the image side of the first lens 2. The first gasket 3 is arranged on the object side of the second lens 4. The first gasket 3 separates the first lens 2 from the second lens 4. At the same time, the thickness setting of the first gasket 3 facilitates the adjustment of the distance between the first lens 2 and the second lens 4, thereby facilitating the adjustment of the focal length and improving the applicable range.

[0038] A second spacer 5 is provided on the image side of the second lens 4. The second spacer 5 is arranged on the object side of the third lens 6. A third spacer 7 is provided on the image side of the third lens 6. The third spacer 7 is arranged on the object side of the infrared filter 8. The second lens 4, the third lens 6 and the infrared filter 8 are isolated by the second spacer 5 and the third spacer 7 to prevent contact between the second lens 4, the third lens 6 and the infrared filter 8, thereby improving the service life between the lenses.

[0039] The outer diameter of the first lens 2 is smaller than that of the second lens 4, and the outer diameter of the second lens 4 is smaller than that of the third lens 6. The radii of the first lens 2, the second lens 4 and the third lens 6 are different to facilitate the installation of the first lens 2, the second lens 4 and the third lens 6.

[0040] The first lens 2, the second lens 4 and the third lens 6 are all plastic lenses. The compression cap 1 is a hard plastic sleeve, and the housing 9 is a metal shell, which reduces the number of lenses used, lowers the production cost, improves the protection effect on the lenses, and extends the service life.

[0041] When using this short-focus lens, it is composed of the first lens 2, the first spacer 3, the second lens 4, the second spacer 5, the third lens 6, the third spacer 7 and the infrared filter 8 arranged in sequence along the optical axis from the object plane to the image plane. The number of lenses used as a whole is small, and it can be installed and used in a smaller space, improving the application range of the short-focus lens, having a good near-infrared imaging effect, small chromatic aberration of the short-focus lens, and thus improving the use effect.

[0042] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-thin short-focus lens device for an intelligent water meter, characterized in that: It includes a compression cap (1). Inside the cavity of the compression cap (1), a first lens (2), a second lens (4), and a third lens (6) are sequentially arranged from the object side to the image side. An infrared filter (8) is arranged on the image side of the third lens (6). The object side surface of the first lens (2) is aspherical, the image side surface of the first lens (2) is concave, and the first lens (2) is a plano-concave lens. The object side surface of the second lens (4) is convex, the image side surface of the second lens (4) is concave, and the second lens (4) is a convex-concave lens. The object side surface of the third lens (6) is aspherical, the image side surface of the third lens (6) is convex, and the third lens (6) is a convex-convex lens.

2. The ultra-thin short-focus lens device for an intelligent water meter according to claim 1, characterized in that: The outer side of the compression cap (1) is snap-connected with a housing (9). The object side of the housing (9) is cylindrical, and the image side of the housing (9) is square-tubular.

3. The ultra-thin short-focus lens device for an intelligent water meter according to claim 2, wherein: A circular plate is integrally formed on the object side of the compression cap (1), and semi-circular holes are equally angled on the outer side of the circular plate, and the radii of multiple groups of semi-circular holes are the same.

4. The ultra-thin short-focus lens device for an intelligent water meter according to claim 3, characterized in that: A first gasket (3) is arranged on the image side of the first lens (2), and the first gasket (3) is arranged on the object side of the second lens (4).

5. The ultra-thin short-focus lens device for an intelligent water meter according to claim 4, wherein: A second gasket (5) is arranged on the image side of the second lens (4), the second gasket (5) is arranged on the object side of the third lens (6), a third gasket (7) is arranged on the image side of the third lens (6), and the third gasket (7) is arranged on the object side of the infrared filter (8).

6. The ultra-thin short-focus lens device for an intelligent water meter according to claim 5, characterized in that: The outer diameter of the first lens (2) is smaller than the outer diameter of the second lens (4), and the outer diameter of the second lens (4) is smaller than the outer diameter of the third lens (6).

7. The ultra-thin short-focus lens device for an intelligent water meter according to claim 6, characterized in that: The first lens (2), the second lens (4), and the third lens (6) are all plastic lenses, the compression cap (1) is a hard plastic sleeve, and the housing (9) is a metal shell.

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