A manually adjustable high-precision infrared electric temperature measuring lens and its installation method

Abstract

The present invention provides a manually adjustable high-precision infrared electric temperature measuring lens and an installation method thereof, comprising a lens housing and an optical system located in the lens housing, wherein the optical system comprises a negative lens A, a negative lens B, and a positive lens C arranged in sequence along the incident direction of light, wherein the air interval between the negative lens A and the negative lens B is 1.5 mm, and the air interval between the negative lens B and the positive lens C is 14.8 mm. The lens of the present invention has a simple structure, is easy to assemble, and is suitable for mass production; the structure supports both electric and manual focusing modes, so that the lens can adapt to detection and monitoring at different distances, and is suitable for large-scale promotion.

Description

Technical Field

[0001] The invention relates to a manually adjustable high-precision infrared electric temperature measuring lens and a mounting method thereof. Background Art

[0002] Compared with ordinary contact temperature measurement methods, infrared temperature measurement has great advantages. First, the response speed is faster than traditional temperature measurement, and the temperature of the object being measured can be read instantly. Secondly, infrared temperature measurement is non-contact, and it converts the thermal radiation of the object into a light signal and then into an electrical signal for display. Thirdly, infrared temperature measurement has a wide test range and a large area. It can quickly, intuitively and accurately find high-temperature points, record the temperature rise process in the measurement area, and effectively and conveniently improve work efficiency. However, the existing infrared temperature measurement lens structure is large, the cost is high and it is not suitable for large-scale production. Summary of the invention

[0003] The present invention improves the above-mentioned problem, that is, the present invention designs an infrared temperature measuring lens which is easy to assemble, suitable for mass production and has low cost.

[0004] The specific implementation scheme of the present invention is: a manually adjustable high-precision infrared electric temperature measuring lens, comprising a lens housing and an optical system located in the lens housing, wherein the optical system comprises a negative lens A, a negative lens B, and a positive lens C arranged in sequence along the incident direction of the light, wherein the air gap between the negative lens A and the negative lens B is 1.5 mm, and the air gap between the negative lens B and the positive lens C is 14.8 mm.

[0005] Furthermore, the lens housing includes a main lens barrel, in which negative lens A, negative lens B, and positive lens C are fixed, the main lens barrel is sleeved on the outside of the main lens barrel, and guide pins are fixedly connected to the outer surface of the main lens barrel, the outer surface of the main barrel has an oblique groove, the main barrel is sleeved on the outside of the main barrel, and the cam has a straight groove, and the upper end of the guide pin passes through the oblique groove and extends into the straight groove.

[0006] Furthermore, the main lens barrel has grooves for limiting each lens, the front side of the negative lens A is threadedly connected to a front pressure ring for limiting the negative lens A, an AB spacer is fixed between the negative lens A and the negative lens B, and the rear side of the positive lens C in the main lens barrel is threadedly connected to a rear pressure ring.

[0007] Furthermore, a connecting seat is screwed to the rear side of the main cylinder.

[0008] Furthermore, a motor frame is fixedly connected to the outside of the main cylinder, a motor is fixed on the motor frame, a shaft sleeve is coaxially fixed to the output end of the motor, a motor gear is fixedly connected to the peripheral sleeve, and the outer surface of the cam has a gear ring that can mesh with the motor gear. A micro switch is also arranged on the outside of the main cylinder.

[0009] Furthermore, a potentiometer is fixed on the motor frame, a potentiometer gear is coaxially fixed on the potentiometer, and the potentiometer gear is meshed with the motor gear.

[0010] The present invention also includes a method for manually adjusting a high-precision infrared electric temperature measuring lens, comprising the following steps:

[0011] (1) In this embodiment, the main lens barrel is put on the main barrel, and the guide pin locked on the main lens barrel is passed through the oblique groove on the main barrel. Then the cam is put on, and the straight groove on the cam is aligned with the guide pin to ensure that the upper end of the guide pin is located in the straight groove. After the cam is installed, the cam is rotated to check the transmission effect. It is necessary to confirm that the rotation of the cam drives the guide pin to move in the oblique groove of the main barrel so as to achieve smooth forward and backward movement of the main lens barrel;

[0012] (2) Assemble the connecting seat. Connect the connecting seat and the main tube with screws to ensure stability. After completing the main installation, install the electronic components, install the motor, and then install the two micro switch racks on the main tube;

[0013] (3) Take the negative lens B and install it on the mounting surface of the main lens barrel with the convex surface facing upwards. Then put the AB spacer into the main lens barrel. The lower end of the AB spacer is provided with a limit groove, which matches the negative lens B. The upper end of the AB spacer is a flat end for placing the negative lens A. The relative position of the limit groove and the flat end ensures the AB air gap. After assembling the AB spacer, place the negative lens A on the flat end of the AB spacer with the convex surface facing upwards and then tighten it with the front pressure ring. Finally, turn the lens body over to assemble the positive lens C. Assemble the positive lens C with the flat surface facing upwards on the main lens barrel and tighten it with the rear pressure ring to fix it in place. The main lens barrel is provided with a limit groove, which ensures the BC air gap. The above completes the assembly of the optical assembly part.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the lens of the present invention has a simple structure, is easy to assemble, and is suitable for mass production; the structure supports both electric and manual focusing modes, so that the lens can adapt to detection and monitoring at different distances and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of an optical system according to an embodiment of the present invention.

[0016] Figure 2 Schematic diagram of the optical lens structure of an embodiment of the present invention.

[0017] Figure 3 A schematic diagram of the motor structure of an embodiment of the present invention;

[0018] Figure 4 The figure is a schematic diagram of the lens structure of an embodiment of the present invention.

[0019] In the figure: 1-main lens barrel, 2-main barrel, 3-guide pin, 4-connecting seat, 5-rear pressure ring, 6-cam, 7-AB spacer, 8-front pressure ring, 9-motor gear, 10-motor sleeve, 11-elastic gasket, 12-locking nut, 13-1524 motor, 14-potentiometer, 15-motor frame, 16-potentiometer gear, 17-micro switch frame 1, 18-micro switch 1, 19-micro switch frame 2, 20-micro switch 2, A-negative lens A, B-negative lens B, C-positive lens C. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figures 1 to 4 As shown, the optical system of the lens is provided with a negative lens A, a negative lens B, and a positive lens C in sequence along the incident direction of light from left to right. In this embodiment, along the incident direction of light, the air gap between the negative lens A and the negative lens B is 1.5 mm, and the air gap between the negative lens B and the positive lens C is 14.8 mm.

[0022] In this embodiment, the main body of the lens assembly process can be divided into an electronic component assembly part, a mechanical assembly part, and an optical assembly part.

[0023] In this embodiment, the lens housing includes a main lens barrel, in which negative lens A, negative lens B, and positive lens C are fixed, a main barrel is sleeved on the outside of the main lens barrel, and guide pins are fixedly connected to the outer surface of the main lens barrel, the outer surface of the main barrel has an oblique groove, the main barrel is sleeved on the outside of the main barrel, and the cam has a straight groove, and the upper end of the guide pin passes through the oblique groove and extends into the straight groove.

[0024] In this embodiment, the main lens barrel has grooves for limiting each lens, the front side of the negative lens A is threadedly connected to a front pressure ring for limiting the negative lens A, an AB spacer ring is fixed between the negative lens A and the negative lens B, and the rear side of the positive lens C in the main lens barrel is threadedly connected to a rear pressure ring.

[0025] In this embodiment, a connecting seat is screwed to the rear side of the main tube, and the connecting seat is configured to connect a camera.

[0026] In this embodiment, the main cylinder is fixedly connected to a motor frame outside, a motor is fixed on the motor frame, a shaft sleeve is coaxially fixed to the output end of the motor, a motor gear is fixedly connected to the peripheral sleeve, the outer surface of the cam has a gear ring that can mesh with the motor gear, and a micro switch is also arranged on the outside of the main cylinder.

[0027] When working, there are straight grooves on the cam and oblique grooves on the main barrel. The gears on the cam mesh with the motor gears for transmission. The motor drives the cam to rotate, and the transmission is transmitted to the main barrel through the guide pins to drive the main barrel to move, thereby achieving the effect of adjusting the object distance. A potentiometer is designed next to the motor. The potentiometer can make the motor transmission have a predetermined position and memorize the motor transmission, making the transmission more accurate and achieving automatic focusing at different object distances.

[0028] The front end of the main lens barrel is provided with a manual adjustment structure, so that the lens can support manual focusing while meeting the requirements of electric focusing. The focusing structure extends out of the lens barrel body to facilitate focusing operation.

[0029] In this embodiment, the three lenses of the lens group are all made of germanium material, which has a low cost, is economical and is conducive to mass production and promotion.

[0030] The optical dot matrix array of the lens is 640*512, the pixel size is 17um, the imaging field of view of the entire lens is 25°x20°, and the detection distance is 0.5m-infinity.

[0031] The outer side of the connection seat is processed with an M34x0.75-6g threaded interface.

[0032] During assembly, in this embodiment, the main lens barrel is put on the main barrel, and the main lens barrel and the main barrel are connected by locking three evenly distributed guide pins through the oblique groove on the main barrel, and then the cam is put on, and the straight groove on the cam is aligned with the guide pin. After the cam is installed, the cam is rotated to check the transmission effect. It is necessary to confirm that the rotation of the cam drives the guide pin to move in the oblique groove of the main barrel so as to achieve smooth forward and backward movement of the main lens barrel. Then assemble the connecting seat, and the connecting seat and the main barrel are connected by 6 screws to ensure stability. After the main body is installed, the electronic components are installed, and the motor frame with the motor and potentiometer components installed is assembled on the main barrel. The motor frame hole is aligned with the main barrel screw hole and locked and fixed, and then the two micro switch frames are installed on the corresponding positions on the main barrel and locked and fixed with screws. After the assembly is completed, the gear meshing condition is checked and qualified, and the assembly of the machine part is completed.

[0033] In this embodiment, the optical installation part is mainly as follows: first, take the negative lens B with the convex surface facing upward and install the negative lens B on the installation surface of the main lens barrel, and then put the AB spacer into the main lens barrel with the big end facing upward. The lower end of the AB spacer is provided with a limit groove, and the limit groove and the negative lens B match each other. The upper end of the AB spacer is a flat end for placing the negative lens A. The relative position of the limit groove and the flat end ensures the AB air gap. After assembling the AB spacer, place the negative lens A with the convex surface facing upward on the flat end of the AB spacer and then tighten it with the front pressure ring. Finally, flip the lens body to assemble the positive lens C, assemble the positive lens C with the flat surface facing upward on the main lens barrel, and use the rear pressure ring to tighten and fix the position. The main lens barrel is provided with a limit groove, and the limit groove ensures the BC air gap. The above completes the assembly of the optical installation part.

[0034] In this embodiment, the assembled lens needs to go through wire welding, wiring, imaging testing, performance debugging, etc. to ensure the qualification of the lens.

[0035] In this embodiment, the optical system composed of the above lens group achieves the following technical indicators:

[0036] (1) Working band: 8μm-12μm; (2) Focal length: f′=25mm; (3) Detector: long-wave infrared uncooled type 640×512, adaptable to 17μm and below; (4) Field of view: 25°x20°; (5) Relative aperture D / f′: 1 / 1.0;

[0037] In this embodiment, the lens is designed with two focusing modes: electric focusing and manual focusing.

[0038] In this embodiment, the lens is designed with a potentiometer to allow the motor drive to have a predetermined position and memorize the motor drive, so that the drive is more precise and can achieve automatic focusing at different object distances.

[0039] In this embodiment, the connection seat is designed with M34x0.75-6g thread to match the camera.

[0040] Unless otherwise stated, any technical solution disclosed in the present invention disclosed above, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many implementable numerical values. Since there are too many numerical values ​​to be exhaustive, the present invention discloses some numerical values ​​to illustrate the technical solution of the present invention, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the present invention.

[0041] If the words "first", "second" and so on are used in this article to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of description to distinguish the components. Unless otherwise stated, the above words have no special meaning.

[0042] At the same time, if the above-mentioned invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an integrated molding process).

[0043] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0044] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for installing a manually adjustable high-precision infrared electric temperature measuring lens, characterized in that: The manually adjustable high-precision infrared electric temperature measuring lens comprises a lens housing and an optical system located in the lens housing, wherein the optical system is composed of a negative lens A, a negative lens B, and a positive lens C arranged in sequence along the incident direction of the light, wherein the air gap between the negative lens A and the negative lens B is 1.5 mm, and the air gap between the negative lens B and the positive lens C is 14.8 mm; The lens housing comprises a main lens barrel, a negative lens A, a negative lens B, and a positive lens C are fixed in the main lens barrel, a main barrel is sleeved on the outside of the main lens barrel, a guide pin is fixedly connected to the outer surface of the main lens barrel, the outer surface of the main barrel has an oblique groove, a cam is sleeved on the outside of the main barrel, the cam has a straight groove, and the upper end of the guide pin passes through the oblique groove and extends into the straight groove; The main lens barrel has a groove for limiting each lens, the front side of the negative lens A is threadedly connected to a front pressure ring for limiting the negative lens A, an AB spacer is fixed between the negative lens A and the negative lens B, and the rear side of the positive lens C in the main lens barrel is threadedly connected to a rear pressure ring; The rear side of the main cylinder is screwed with a connecting seat; The main cylinder is fixedly connected to a motor frame, a motor is fixed on the motor frame, a shaft sleeve is coaxially fixed to the output end of the motor, a motor gear is fixedly connected to the shaft sleeve, the outer surface of the cam has a gear ring that can mesh with the motor gear, and a micro switch is also arranged on the outside of the main cylinder; A potentiometer is also fixed on the motor frame, a potentiometer gear is coaxially fixed on the potentiometer, and the potentiometer gear is meshed with the motor gear; The threaded interface on the outside of the connection seat includes the following steps: (1) Take the main lens barrel and put it on the main barrel. Pass the guide pin locked on the main lens barrel through the oblique groove on the main barrel. Then put on the cam. Align the straight groove on the cam with the guide pin to ensure that the upper end of the guide pin is located in the straight groove. After installing the cam, rotate the cam to check the transmission effect. It is necessary to confirm that the rotation of the cam drives the guide pin to move in the oblique groove of the main barrel so that the main lens barrel can move forward and backward smoothly. (2) Assemble the connecting seat. Connect the connecting seat and the main tube with screws to ensure stability. After completing the main installation, install the electronic components, install the motor, and then install the two micro switch racks on the main tube; (3) Take the negative lens B and install it on the mounting surface of the main lens barrel with the convex surface facing upwards. Then put the AB spacer into the main lens barrel. The lower end of the AB spacer is provided with a limit groove, which matches the negative lens B. The upper end of the AB spacer is a flat end for placing the negative lens A. The relative position of the limit groove and the flat end ensures the AB air gap. After assembling the AB spacer, place the negative lens A on the flat end of the AB spacer with the convex surface facing upwards and then tighten it with the front pressure ring. Finally, turn the lens body over to assemble the positive lens C. Assemble the positive lens C with the flat surface facing upwards on the main lens barrel and tighten it with the rear pressure ring to fix it in place. The main lens barrel is provided with a limit groove, which ensures the BC air gap. The above completes the assembly of the optical assembly part.

Images