Collimating lens, lens module and sweeper

Abstract

The utility model relates to the technical field of optical lenses, and discloses a collimating lens lens, which comprises a first lens, a second lens and a third lens which are coaxially arranged and are sequentially arranged from left to right, a first gasket is arranged between the first lens and the second lens, a second gasket is arranged between the second lens and the third lens, and a third gasket is arranged between the second lens and the third lens. The first lens is a convex-concave type lens, the first lens, the second lens and the third lens are all plastic lenses, the second lens is a concave-concave type lens, and the third lens is a concave-convex type lens. Detection light such as infrared light and laser can be refracted into parallel lines and then emitted to the outside, so that an optical lens of the sweeper can clearly see dust, foreign matters and the like on the ground, and the recognition accuracy of the sweeper on external obstacles and objects can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, in particular to a collimating lens, a lens module and a floor sweeper. Background Technique

[0002] An optical lens is an indispensable component in a machine vision system. It directly affects the quality of the captured image, and further affects the implementation and effect of the algorithm. An optical lens is a device that uses optical principles to control the propagation and focusing of light, so as to realize the process of image capture and imaging. The lens is composed of multiple lenses. Through the refraction and reflection of the curved surface and material of the lens, the light is deflected and focused, and finally the image is projected onto the imaging surface.

[0003] As an intelligent household appliance, a floor sweeping robot can help people automatically clean the dust on the ground and liberate our hands. However, like humans, it needs eyes to clearly see the dust on the ground, and the optical lens is its eyes.

[0004] After retrieval, a patent with the application number CN201920576735.7 discloses an infrared lens, which has a simple structure, is easy to process, has small distortion, is suitable for a floor sweeping robot, and improves the comprehensive performance of the lens. In addition, the utility model also provides a floor sweeping robot using the infrared lens, which includes, sequentially arranged from the object side to the image side: a first lens, a second lens, and a third lens. The first lens has a positive optical power, the object side of the first lens is a convex surface, and the image side of the first lens is a concave surface; the second lens has a negative optical power, the object side of the second lens is a concave surface, and the image side of the second lens is a concave surface; the third lens has a positive optical power, the object side of the third lens is a convex surface, and the image side of the third lens is a convex surface.

[0005] Existing floor sweeping robots usually use infrared lenses to achieve external obstacle detection and object recognition. When the infrared light is emitted outward at the light source, the optical path is circumferentially divergent with the light source as the center. The straight lines where the infrared optical paths are located intersect with each other, resulting in inaccurate distance determination for external obstacles and low object recognition rate. Therefore, we need to propose a collimating lens, a lens module and a floor sweeper to improve the recognition accuracy of the floor sweeper for external obstacles and objects. Content of the Utility Model

[0006] The purpose of the utility model is to provide a collimating lens, a lens module and a floor sweeper. By using a convex-concave lens, a concave-concave lens, and a convex-convex lens in cooperation, detection light such as infrared light and laser can be refracted into parallel lines and then emitted to the outside, which is convenient for the optical lens of the floor sweeper to see the dust, foreign objects, etc. on the ground, and helps to improve the recognition accuracy of the floor sweeper for external obstacles and objects, so as to solve the problems raised in the above background technique.

[0007] To achieve the above object, the present utility model provides the following technical solutions: A collimating lens, comprising a first lens, a second lens, and a third lens arranged coaxially from left to right. A first spacer is installed between the first lens and the second lens, and a second spacer is installed between the second lens and the third lens. The first lens is a convex-concave lens, the second lens is a concave-concave lens, and the third lens is a concave-convex lens.

[0008] That is, the object side of the first lens is convex, and the image side is concave; the object side of the second lens is concave, and the image side is concave; the object side of the third lens is concave, and the image side is convex. Through the cooperation of the three lenses, small distortion is achieved, and the distortion is about 1%, and the influence on the human eye judgment can be ignored.

[0009] Preferably, the sum of the thickness of the first lens and the first spacer is 1.22 mm, the sum of the thickness of the first lens, the first spacer, and the second lens is 1.82 mm, the sum of the thickness of the first lens, the first spacer, the second lens, and the second spacer is 2.22 mm, and the sum of the thickness of the first lens, the first spacer, the second lens, the second spacer, and the third lens is 2.57 mm.

[0010] All three lenses are made of plastic lenses, and the thickness of the lenses is relatively thin, which reduces the weight of the lens.

[0011] Preferably, the first lens, the second lens, and the third lens are all made of plastic lenses, which reduces the weight of the lens.

[0012] The present utility model also provides a lens module, including a collimating lens described above. The lens module includes a lens housing, and an installation groove with a stepped inner wall for installing the collimating lens is provided inside the lens housing. Through the design of the stepped installation groove, the stability of the installation of the collimating lens can be ensured.

[0013] Preferably, a plurality of through holes are provided on the side of the lens housing for installing the collimating lens.

[0014] Preferably, a first mounting hole and a second mounting hole are further provided on the lens housing. A first metal sheet is installed inside the first mounting hole, and a second metal sheet is installed inside the second mounting hole. Both metal sheets are bent.

[0015] Preferably, the surfaces of the first metal sheet and the second metal sheet are flush with the upper surface of the lens housing, making the surface of the lens module smoother and increasing the aesthetics of the lens module.

[0016] The present utility model also provides a floor sweeper, which includes a lens module described above. The floor sweeper includes a main body of the floor sweeper, and the lens module is installed at the front end of the main body of the floor sweeper. When the main body of the floor sweeper advances, the lens module can scan obstacles and foreign objects in front.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] For the infrared lens of the floor sweeper of the present utility model, through the combined use of convex-concave lenses, concave-concave lenses, and convex-concave lenses, small distortion is achieved, and the distortion is about 1%, and the influence on human eye judgment can be ignored. With a three-lens structure, the weight of the lens is reduced, and at the same time, the production cost and processing difficulty of the lens are reduced, and the comprehensive performance of the lens is improved to meet the special application requirements of infrared monitoring, which is applicable to the field of intelligent robot monitoring systems and improves the comprehensive performance of the lens;

[0019] It can refract detection light such as infrared light and laser into parallel lines and then emit them to the outside, which is convenient for the optical lens of the floor sweeper to see dust, foreign objects, etc. on the ground, and helps to improve the recognition accuracy of the floor sweeper for external obstacles and objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a front structural schematic diagram of the present utility model;

[0021] Figure 2 is a sectional view of the present utility model;

[0022] Figure 3 is a back structural schematic diagram of the present utility model;

[0023] Figure 4 is a front schematic diagram of the lens housing of the present utility model;

[0024] Figure 5 is a back schematic diagram of the lens housing of the present utility model;

[0025] Figure 6 is a structural schematic diagram of the first metal sheet and the second metal sheet of the present utility model.

[0026] In the figure: 1, lens housing; 2, first lens; 3, first gasket; 4, second lens; 5, second gasket; 6, third lens; 7, first metal sheet; 8, second metal sheet; 9, through hole; 10, first mounting hole; 11, second mounting hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] 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.

[0028] Please refer to Figures 1-6 , the present invention provides a technical solution: a collimating lens, including a first lens 2, a second lens 4, and a third lens 6 arranged coaxially from left to right in sequence. A first spacer 3 is installed between the first lens 2 and the second lens 4, and a second spacer 5 is installed between the second lens 4 and the third lens 6. The first lens 2 is a convex-concave lens, the second lens 4 is a concave-concave lens, and the third lens 6 is a concave-convex lens. The third lens 6 used in the prior art is a convex-convex lens.

[0029] Specifically, the first lens has a positive optical power. The object side of the first lens is a convex surface, and the image side of the first lens is a concave surface.

[0030] The second lens has a negative optical power. The object side of the second lens is a concave surface, and the image side of the second lens is a concave surface.

[0031] The third lens has a positive optical power. The object side of the third lens is a concave surface, and the image side of the third lens is a convex surface.

[0032] Specifically, both sides of the first spacer 3 are respectively attached to the opposite sides of the first lens 2 and the second lens 4, and both sides of the second spacer 5 are respectively attached to the opposite sides of the second lens 4 and the third lens 6.

[0033] The sum of the thicknesses of the first lens 2 and the first spacer 3 is 1.22 mm. The sum of the thicknesses of the first lens 2, the first spacer 3, and the second lens 4 is 1.82 mm. The sum of the thicknesses of the first lens 2, the first spacer 3, the second lens 4, and the second spacer 5 is 2.22 mm. The sum of the thicknesses of the first lens 2, the first spacer 3, the second lens 4, the second spacer 5, and the third lens 6 is 2.57 mm.

[0034] That is, the thickness of the second lens 4 is 0.6 mm, and the thickness of the second spacer 5 is 0.4 mm.

[0035] The first lens 2, the second lens 4, and the third lens 6 are all made of plastic lenses, which reduces the mass of the lens, while reducing the production cost and processing difficulty of the lens, and improving the comprehensive performance of the lens.

[0036] The present utility model also provides a lens module, which includes a collimating lens described above. The lens module includes a lens housing 1. An installation groove with a stepped inner wall for installing the collimating lens is formed inside the lens housing 1. Further, one side of the third lens 6 is easily connected to the inner wall of the installation groove by dispensing glue (black UV glue).

[0037] It should be noted that the lens housing 1 is composed of a large housing and a small housing connected together. The length of the large housing is 6.8 ± 0.05 mm, and the width of the large housing is 4.00 ± 0.05 mm; the outer length of the small housing is 4.30 ± 0.05 mm, and the outer width of the small housing is 3.60 ± 0.05 mm;

[0038] The inner wall length of the large housing is 5.09 ± 0.05 mm, and the inner wall width of the large housing is 3.24 ± 0.05 mm; the inner wall length of the small housing is 2.9 mm, and the inner wall width of the small housing is 2.8 mm.

[0039] A plurality of through holes 9 are formed on the side of the lens housing 1.

[0040] As Figures 3-6 shown, a first mounting hole 10 and a second mounting hole 11 are also formed on the lens housing 1. A first metal sheet 7 is installed inside the first mounting hole 10, and a second metal sheet 8 is installed inside the second mounting hole 11.

[0041] In particular, the first metal sheet 7 and the second metal sheet 8 should not have any scratches or deformations. And the distance between the ends of the first metal sheet 7 and the second metal sheet 8 and the side of the large housing is 0.08 ± 0.03 mm.

[0042] The surfaces of the first metal sheet 7 and the second metal sheet 8 are flush with the upper surface of the lens housing 1.

[0043] The present utility model also provides a floor sweeper, which includes a lens module described above. The floor sweeper includes a floor sweeper main body, and the lens module is installed at the front end of the floor sweeper main body.

[0044] The floor sweeper main body includes a floor sweeper housing. A cleaning component for cleaning dust is arranged on the side of the floor sweeper housing. Driving wheels for driving the floor sweeper main body to move are installed at the bottom of the floor sweeper housing. And a driving mechanism for driving the driving wheels to move and driving the cleaning component to sweep dust is also installed inside the floor sweeper main body. Moreover, a debris storage box and a water tank are installed inside the floor sweeper main body.

[0045] Specifically, the internal structure, moving method, and driving method of the floor sweeper main body are prior arts, and their specific structures and operating principles will not be elaborated here. For details, please refer to the patent with the application number CN202222398811.4.

[0046] Although embodiments of the present utility model 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 utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A collimating lens, characterized in that: The invention comprises a first lens (2), a second lens (4), and a third lens (6) which are coaxially arranged and arranged in sequence from left to right; a first gasket (3) is installed between the first lens (2) and the second lens (4); a second gasket (5) is installed between the second lens (4) and the third lens (6); the first lens (2) is configured as a convex-concave lens, the second lens (4) is configured as a concave-concave lens, and the third lens (6) is configured as a concave-convex lens.

2. The collimating lens according to claim 1, characterized in that: The sum of the thicknesses of the first lens (2) and the first gasket (3) is 1.22 mm, the sum of the thicknesses of the first lens (2), the first gasket (3) and the second lens (4) is 1.82 mm, the sum of the thicknesses of the first lens (2), the first gasket (3), the second lens (4) and the second gasket (5) is 2.22 mm, and the sum of the thicknesses of the first lens (2), the first gasket (3), the second lens (4), the second gasket (5) and the third lens (6) is 2.57 mm.

3. The collimating lens according to claim 1, characterized in that: The first lens (2), the second lens (4) and the third lens (6) are all plastic lenses.

4. A lens module, comprising a collimating lens according to any one of claims 1 to 3, characterized in that: The lens housing (1) comprises a lens housing, wherein a mounting groove with a stepped inner wall for mounting a collimating lens is provided inside the lens housing (1).

5. A lens module according to claim 4, characterized in that: A plurality of through holes (9) are provided on the side of the lens housing (1).

6. The lens module according to claim 4, characterized in that: The lens housing (1) is also provided with a first mounting hole (10) and a second mounting hole (11); a first metal sheet (7) is mounted inside the first mounting hole (10), and a second metal sheet (8) is mounted inside the second mounting hole (11).

7. The lens module according to claim 6, characterized in that: The surfaces of the first metal sheet (7) and the second metal sheet (8) are both flush with the upper surface of the lens housing (1).

8. A sweeping machine, comprising a lens module according to any one of claims 4 to 7, characterized in that: The utility model comprises a sweeping machine body, and the lens module is installed at the front end of the sweeping machine body.

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