Assembly positioning tooling and positioning method for lenses of low-light night vision cameras

Abstract

The invention discloses an assembly and positioning tool for a low-light-level night-vision camera lens and a positioning method in the field of low-light-level night-vision cameras. The assembly and positioning tool comprises a lens barrel profiling block, a reference positioning block and a moving platform. The middle portion of the upper end of the lens barrel profiling block is detachably fixedly connected to the lower end of a probe of an altimeter. The reference positioning block is fixedly connected to the upper end of the moving platform. The moving platform is arranged on a measuring platform of the altimeter and is used for horizontally moving the reference positioning block to determine the installation position of the lens barrel profiling block. When the probe contacts a lens in the lens barrel, the contact point is the vertex of the lens, thereby ensuring that the measured distance between the vertices of adjacent lenses is accurate.

Description

Technical Field

[0001] The invention relates to the field of low-light-level night vision cameras, and in particular to an assembly and positioning tool and a positioning method for a low-light-level night vision camera lens. Background Art

[0002] The low-light-level night vision camera is mainly composed of lens components, structural components, CMOS sensors, and graphic signal board components. Its working principle is as follows: weak night sky light (a general term for moonlight, starlight, and atmospheric glow that exist at night) is reflected from the surface of an object and enters the low-light-level night vision lens. Under the action of the optical lens group, it is focused on the photocathode surface of the sensor (coinciding with the rear focal plane of the lens group), stimulating photoelectrons. The photoelectrons are accelerated, focused, and imaged under the action of the electronic optical system inside the sensor, bombarding the sensor's fluorescent screen at an extremely high speed and stimulating sufficiently strong visible light. The formed image is further amplified and transmitted to the display system through the graphic signal board component, thereby turning a distant target illuminated only by weak night sky light into a visible light image suitable for human eye observation.

[0003] The lens assembly consists of optical elements and structural components. Several single lenses and cemented lenses are assembled sequentially within an aluminum alloy barrel to form a fixed-focal-length lens group. Spacers of appropriate thickness ensure air separation between adjacent lenses, while the first and last lenses are secured with threaded clamps.

[0004] During the lens assembly process, each lens must be inspected to ensure that the distance between it and adjacent lenses meets the designed dimensions. Currently, the instrument used for this inspection is a height gauge. This instrument uses a probe to measure the distance between the vertices of two adjacent lenses. Based on the difference between the actual and theoretical dimensions, the thickness or thinning of the spacer between the lenses is determined. However, in practice, it is difficult to ensure that the contact point of the probe is at the lens vertex, which can lead to deviations in the measured distance between the vertices of adjacent lenses.

[0005] Therefore, it is urgent to provide an assembly positioning tool and a positioning method for a low-light-level night vision camera lens to solve the above technical difficulties. Summary of the Invention

[0006] The purpose of the present invention is to provide an assembly positioning tool and positioning method for a low-light-level night vision camera lens, which can ensure that when a probe contacts a lens in a lens barrel, the contact point is the vertex of the lens, and ensure that the measured vertex distance of adjacent lenses is accurate.

[0007] In order to achieve the above-mentioned objectives, the first aspect of the present invention provides an assembly and positioning tool for the lens of a low-light-level night vision camera, wherein the assembly and positioning tool comprises a lens barrel profiling block, a reference positioning block and a movable platform, wherein the middle portion of the upper end of the lens barrel profiling block is detachably fixedly connected to the lower end of the probe of the altimeter, the reference positioning block is fixedly connected to the upper end of the movable platform, and the movable platform is arranged on the measuring platform of the altimeter and is used to horizontally move the reference positioning block to determine the installation position of the lens barrel profiling block.

[0008] Preferably, a thread matching the probe thread of the altimeter is provided at the top center of the lens barrel profiling block.

[0009] Preferably, the movable platform includes a loading beam and a horizontal displacement platform, the reference positioning block is fixedly installed on the upper end of the horizontal displacement platform, the loading beam is fixedly connected to the upper end of the measuring platform, and the horizontal displacement platform is arranged at the upper end of the loading beam for moving the reference positioning block.

[0010] Preferably, the horizontal displacement platform is an xy-axis displacement platform.

[0011] Preferably, the upper end of the loading beam is provided with a fixing hole for fixing the horizontal displacement platform, and the side plates at both ends of the loading beam are provided with fixing holes for connecting with the corresponding measuring platform.

[0012] Preferably, the reference positioning block is configured as a V-shaped block, and the two inner side surfaces of the V-shaped block can abut against the lens barrel profiling block.

[0013] A second aspect of the present invention provides a method for assembling and positioning a lens of a low-light-level night vision camera, using the above-mentioned assembly and positioning tool, comprising the following steps:

[0014] S1, fixing the upper end of the lens barrel profiling block to the lower end of the probe of the altimeter, installing the mobile platform on the measuring platform, and installing the reference positioning block on the mobile platform;

[0015] S2, horizontally moving the reference positioning block by the mobile platform so that at least two points on the reference positioning block contact the lens barrel profiling block, thereby determining the installation position of the lens barrel;

[0016] S3. Remove the lens barrel profiling block from the lower end of the probe of the altimeter, and then place the lens barrel at the same position as the reference positioning block. At this time, when the probe contacts the lens in the lens barrel, the contact point is the vertex of the lens.

[0017] According to the above technical solution, the upper end of the lens barrel profiling block is first fixedly connected to the lower end of the altimeter probe, the mobile platform is installed on the measuring platform, and the reference positioning block is installed on the mobile platform. The reference positioning block is horizontally moved by the mobile platform so that at least two points on the reference positioning block contact the lens barrel profiling block, thereby determining the installation position of the lens barrel. The lens barrel profiling block is then removed from the lower end of the altimeter probe, and the lens barrel is then placed in the same position as the reference positioning block. At this time, the center of the lens barrel is directly opposite the altimeter probe. When the probe contacts a lens in the lens barrel, the contact point is the lens vertex, ensuring that the measured distance between the vertices of adjacent lenses is accurate.

[0018] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0021] Figure 2 It is a structural schematic diagram of an embodiment of the load-carrying beam of the present invention;

[0022] Figure 3 It is a structural schematic diagram of an embodiment of the lens barrel profiling block of the present invention;

[0023] Figure 4 It is a structural diagram of an implementation method of a reference positioning block in the present invention.

[0024] Description of Reference Numerals

[0025] 1-lens barrel copy block, 2-reference positioning block, 3-thread, 4-carrying beam, 5-xy axis displacement platform. DETAILED DESCRIPTION

[0026] The following describes the specific embodiments of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0027] The present invention provides a first aspect of an assembly and positioning tool for a low-light-level night vision camera lens. The assembly and positioning tool includes a lens barrel profiling block 1, a reference positioning block 2, and a movable platform. The lens barrel profiling block 1 is a cylinder with the same diameter as the lens barrel. The middle portion of the upper end of the lens barrel profiling block 1 is detachably fixedly connected to the lower end of a probe of an altimeter. The reference positioning block 2 is fixedly connected to the upper end of the movable platform. The movable platform is arranged on the measuring platform of the altimeter and is used to horizontally move the reference positioning block 2 to determine the installation position of the lens barrel profiling block 1.

[0028] To use the system, first securely connect the upper end of the lens barrel tracing block 1 to the lower end of the altimeter probe. Then, mount the mobile platform on the measuring platform, and then mount the reference positioning block 2 on the mobile platform. The mobile platform then horizontally moves the reference positioning block 2 until at least two points on the reference positioning block 2 contact the lens barrel tracing block 1, thereby determining the lens barrel's installed position. Remove the lens barrel tracing block 1 from the lower end of the altimeter probe, and then place the lens barrel in the same position as the reference positioning block 2. This way, the center of the lens barrel faces the altimeter probe. When the probe contacts a lens within the lens barrel, the contact point corresponds to the lens vertex, ensuring that the distance between the vertices of adjacent lenses is accurately measured.

[0029] In this embodiment, a thread 3 that matches the probe thread of the altimeter is provided at the top center of the lens barrel shaped block 1. The lens barrel shaped block 1 is connected to the probe thread of the altimeter to facilitate installation and disassembly.

[0030] In this embodiment, the mobile platform includes a loading beam 4 and a horizontal displacement platform. The reference positioning block 2 is fixedly installed on the upper end of the horizontal displacement platform. The loading beam 4 is fixedly connected to the upper end of the measuring platform. The horizontal displacement platform is arranged at the upper end of the loading beam 4 for moving the reference positioning block 2.

[0031] When installing the loading beam 4, it is necessary to roughly estimate the landing point of the probe, and then place the loading stage in the center and fix it on the measuring platform. The horizontal displacement platform is installed at the center of the upper end of the loading beam 4, and then the reference positioning block 2 is installed on the upper end of the horizontal displacement platform. The position of the reference positioning block 2 is horizontally adjusted through the horizontal displacement platform so that at least two points on the reference positioning block 2 are in contact with the lens barrel copy block 1 to determine the installation position of the lens barrel.

[0032] In this embodiment, the horizontal displacement platform is an xy-axis displacement platform 5, which can adjust the reference positioning block 2 to move along the xy axis, thereby causing the reference positioning block 2 to abut against the lens barrel contour block 1. The xy-axis displacement platform 5 includes three layers of structural plates. The bottom structural plate is fixed to the loading beam 4. The middle structural plate is slidably connected to the bottom structural plate and can slide along the x-axis when driven by a threaded rod. The upper structural plate is slidably connected to the middle structural plate and can slide along the y-axis when driven by another threaded rod. The threaded rods are all arranged on the side of the xy-axis displacement platform 5. The threaded rod that drives the middle structural plate to slide is threadedly connected to the outside of the bottom structural plate, and the end of the threaded rod is rotatably connected to the middle structural plate; the threaded rod that drives the upper structural plate to slide is threadedly connected to the outside of the middle structural plate, and the end of the threaded rod is rotatably connected to the upper structural plate.

[0033] In this embodiment, the upper end of the loading beam 4 is provided with fixing holes for securing the horizontal displacement platform. The side panels at both ends of the loading beam 4 are also provided with fixing holes for connecting to the associated measurement platform. Screws engaging the fixing holes secure the loading beam 4 to the measurement platform, and the horizontal displacement platform to the upper end of the loading beam 4.

[0034] In this embodiment, the reference positioning block 2 is set as a V-shaped block, and the two inner side surfaces of the V-shaped block can abut against the lens barrel copy block 1. When the V-shaped block abuts against the lens barrel copy block 1, the V-shaped block can be used as a reference for placing the lens barrel. The lens barrel is replaced with the lens barrel copy block 1 and placed against the V-shaped block, so that it can be determined that the probe is directly above the center point of the lens barrel. When the probe contacts the lens, the contact point is the vertex of the lens.

[0035] The present invention provides a second aspect of a method for assembling and positioning a lens of a low-light-level night vision camera, using the above-mentioned assembly and positioning tool, comprising the following steps:

[0036] S1. Fix the upper end of the lens barrel profiling block 1 to the lower end of the probe of the altimeter, install the mobile platform on the measuring platform, and install the reference positioning block 2 on the mobile platform;

[0037] S2, horizontally moving the reference positioning block 2 by the mobile platform so that at least two points on the reference positioning block 2 are in contact with the lens barrel profiling block 1, thereby determining the installation position of the lens barrel;

[0038] S3. Remove the lens barrel profiling block 1 from the lower end of the altimeter probe, and then place the lens barrel in the same position as the reference positioning block 2. At this time, the center of the lens barrel is facing the altimeter probe. When the probe contacts the lens in the lens barrel, the contact point is the vertex of the lens.

[0039] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0040] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0041] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for assembling and positioning a lens of a low-light-level night vision camera, characterized in that: Positioning is performed using an assembly positioning tool, the assembly positioning tool comprising a lens barrel profiling block (1), a reference positioning block (2) and a moving platform, the middle portion of the upper end of the lens barrel profiling block (1) being detachably fixedly connected to the lower end of the probe of the altimeter, the reference positioning block (2) being fixedly connected to the upper end of the moving platform, the moving platform being arranged on the measuring platform of the altimeter for horizontally moving the reference positioning block (2) to determine the installation position of the lens barrel profiling block (1); wherein the reference positioning block (2) is arranged as a V-shaped block, and the two inner side surfaces of the V-shaped block can abut against the lens barrel profiling block (1); A thread (3) adapted to the probe thread of the altimeter is provided at the top center of the lens barrel profiling block (1); The mobile platform comprises a loading beam (4) and a horizontal displacement platform, the reference positioning block (2) is fixedly mounted on the upper end of the horizontal displacement platform, the loading beam (4) is fixedly connected to the upper end of the measuring platform, and the horizontal displacement platform is arranged on the upper end of the loading beam (4) for moving the reference positioning block (2); wherein, The horizontal displacement platform is an xy-axis displacement platform (5); The upper end of the loading beam (4) is provided with a fixing hole for fixing the horizontal displacement platform, and the side plates at both ends of the loading beam (4) are provided with fixing holes for connecting to the corresponding measuring platform; the assembly positioning method comprises the following steps: S1, fixedly connecting the upper end of the lens barrel profiling block (1) to the lower end of the probe of the altimeter, installing the mobile platform on the measuring platform, and installing the reference positioning block (2) on the mobile platform; S2, horizontally moving the position of the reference positioning block (2) by the mobile platform so that at least two points on the reference positioning block (2) contact the lens barrel profiling block (1), thereby determining the installation position of the lens barrel; S3, the lens barrel profiling block (1) is disassembled from the lower end of the probe of the altimeter, and then the lens barrel is placed at the same position of the reference positioning block (2). At this time, when the probe contacts the lens in the lens barrel, the contact point is the vertex of the lens.

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