Device for measuring mechanical back focal length of infrared lens
By designing a device including a detection workbench, a camera, a manual lifting table and a wire-to-board, the complex and cost problems of traditional measuring equipment are solved, and low-cost and high-flexible infrared lens mechanical rear focal length measurement is achieved.
Patent Information
- Application Number
- CN202422340311.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-25
AI Technical Summary
The equipment for measuring the back focal length of traditional infrared lenses has complex structure, high cost and poor flexibility, making it difficult to meet the measurement needs of different types of lenses.
A device including a detection workbench, a camera, a manual lifting table, a display and an infrared light source is designed. By manually adjusting the lifting table height and reading the scale value, combined with the pattern on the wire-to-plate, the measurement of the mechanical back focal length of the infrared lens is achieved.
It realizes mechanical rear focal length measurement of infrared lenses with simple structure, low cost and high flexibility, which is suitable for the multi-model lens measurement requirements in the R&D stage.
Smart Images
Figure CN223077857U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of measuring the mechanical back focal length of a lens, in particular to a device for measuring the mechanical back focal length of an infrared lens. Background Technique
[0002] In an optical system, the distance from the vertex of the surface of the last optical lens to the image plane is called the mechanical back focal length. For different optical systems, their mechanical back focal lengths are different. Therefore, when installing a lens, it is necessary to adjust the relative position between the lens and the camera, and to measure the mechanical back focal length of the lens first.
[0003] Traditional measuring devices for the mechanical back focal length of infrared lenses have complex structures, high costs, poor flexibility in measuring lenses of different models, and high transformation costs. Content of the Utility Model
[0004] The purpose of the utility model is to overcome the defects of the above-mentioned prior art and provide a device for measuring the mechanical back focal length of an infrared lens.
[0005] The purpose of the utility model can be realized by the following technical solutions:
[0006] A device for measuring the mechanical back focal length of an infrared lens, the device includes a detection workbench; a camera, a manual lifting table, a display and an infrared light source are arranged on the detection workbench; the camera is connected to the display through a data transmission line; a lens fixing block is fixed on the manual lifting table by screws; the lens fixing block is located directly above the camera; the infrared lens to be measured is placed on the lens fixing block; the infrared lens and the camera are concentrically placed in the vertical direction; a wire pair board is arranged on the top of the detection workbench.
[0007] Further, the manual lifting table is a lifting table with scales on it.
[0008] Further, the lens fixing block is provided with a lens positioning hole; the infrared lens is placed in the lens positioning hole.
[0009] Further, the wire pair board is a board with twelve symmetrically arranged identical patterns.
[0010] Compared with the prior art, the utility model has the following advantages:
[0011] The utility model manually adjusts the height of the manual lifting table to achieve the purpose of measuring the mechanical back focal length of the infrared lens. It has a simple structure, low cost, high flexibility, and extremely low transformation cost for measuring lenses of different models, and is suitable for measuring the mechanical back focal length of lenses in the R & D stage. Description of the Drawings
[0012] Figure 1 Schematic diagram of the device structure provided by the present utility model;
[0013] Figure 2 Assembly schematic diagram of the wire-to-board and the detection workbench provided by the present utility model;
[0014] Figure 3 Schematic diagram of the wire-to-board structure provided by the present utility model.
[0015] The reference numerals in the figure are shown as:
[0016] 1, camera; 2, lens fixing block; 3, manual lifting table; 4, infrared lens; 5, data transmission line; 6, display; 7, infrared light source; 8, detection workbench; 9, wire-to-board. Specific embodiments
[0017] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.
[0018] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.
[0019] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0020] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0021] It should be noted that the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.
[0022] In addition, terms such as "horizontal" and "vertical" do not require the components to be absolutely horizontal or hanging vertically, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.
[0023] Embodiment
[0024] As Figure 1 shown, a device for measuring the mechanical back focal length of an infrared lens, the device includes a detection workbench 8; a camera 1, a manual lifting table 3, a display 6 and an infrared light source 7 are arranged on the detection workbench 8; the camera 1 is connected to the display 6 through a data transmission line 5; a lens fixing block 2 is fixed on the manual lifting table 3 by screws; the lens fixing block 2 is located directly above the camera 1; a lens positioning hole is arranged on the lens fixing block 2, and the infrared lens 4 to be measured is placed in the lens positioning hole; the infrared lens 4 and the camera 1 are concentrically placed in the vertical direction; the manual lifting table 3 is a lifting table with scales on it.
[0025] As Figure 2 and 3 shown, a wire pair board 9 is arranged on the top of the detection workbench 8, and the wire pair board 9 has twelve identical patterns arranged symmetrically.
[0026] The working principle of the present utility model is as follows:
[0027] First, turn on the infrared light source 7 to illuminate the wire pair board 9, place the infrared lens 4 in the lens positioning hole on the lens fixing block 2, ensure that the infrared lens 4 and the camera 1 are concentric, then adjust the manual lifting table 3 until the bottom of the lens fixing block 2 just touches the chip protection glass on the camera 1 and read the scale value on the manual lifting table 3, and then adjust the manual lifting table 3 until the pattern on the wire pair board 9 can be clearly presented on the display 6 and read the scale value on the manual lifting table 3 again. The mechanical back focal length of the infrared lens = the difference between the two scale values read above + the distance from the lens flange bearing surface to the bottom of the lens fixing block 2 + the distance from the top surface of the protection glass of the camera 1 to the chip. Among them, the distance from the lens flange bearing surface to the bottom is a fixed value, which can be measured by an altimeter, and the distance from the top surface of the protection glass to the chip is also a fixed value, and the relevant value can be obtained through the chip parameter table.
[0028] The preferred specific embodiments of the present utility model have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present utility model without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field according to the concept of the present utility model through logical analysis, reasoning or limited experiments on the basis of the prior art shall fall within the protection scope determined by the claims.
Claims
1. An apparatus for measuring the mechanical back focal length of an infrared lens, characterized in that, The described device includes a detection workbench (8); a camera (1), a manual lifting table (3), a display (6) and an infrared light source (7) are arranged on the detection workbench (8); the camera (1) is connected to the display (6) through a data transmission line (5); a lens fixing block (2) is fixed on the manual lifting table (3) by screws; the lens fixing block (2) is located directly above the camera (1); an infrared lens (4) to be measured is placed on the lens fixing block (2); the infrared lens (4) and the camera (1) are concentrically placed in the vertical direction; a wire pair board (9) is arranged at the top of the detection workbench (8).
2. The device for measuring the mechanical back focal length of an infrared lens according to claim 1, wherein The manual lifting table (3) is a lifting table with scales on it.
3. The device for measuring the mechanical back focal length of an infrared lens according to claim 1, characterized in that, The lens fixing block (2) is provided with a lens positioning hole; the infrared lens (4) is placed in the lens positioning hole.
4. The device for measuring the mechanical back focal length of an infrared lens according to claim 1, characterized in that, The wire pair board (9) is a board with twelve identical patterns arranged symmetrically.