A high-low temperature compensation group based on an infrared optical system high-low temperature compensation group eliminates backlash structure

Abstract

The application discloses a high-low temperature compensation group gap elimination structure based on an infrared optical system, and belongs to the technical field of infrared thermal imaging. The structure comprises a compensation support, a guide rail, a sliding block, a compensation lens assembly and a compensation motor assembly. The sliding block is installed on the upper portion of the guide rail, the guide rail sliding block assembly is installed on the bottom of the compensation support, the compensation lens assembly is installed on the upper portion of the sliding block through screws, the rear end of the compensation motor assembly is installed on the front side of the compensation support through a compensation motor support, and the side end of the compensation motor assembly is installed on the upper portion of a dynamic shaft of the compensation lens assembly through a special-shaped nut. Compared with the traditional gap elimination spring which is directly installed on the screw shaft for gap elimination, the gap between the screw and the special-shaped nut is eliminated by installing the gap elimination spring on the shaft of the dynamic shaft of the compensation lens assembly, the use effect is good, the stability and reliability are high, the gap in the compensation process of the compensation group is eliminated through the constant elastic force of the compression spring, the image without return difference is ensured in the field of view switching process, and the control difficulty of the motor is reduced.

Description

Technical Field

[0001] This invention belongs to the field of infrared thermal imager technology, specifically relating to a gap-eliminating structure based on the high and low temperature compensation group of an infrared optical system to eliminate hysteresis. Background Technology

[0002] Infrared thermal imagers are widely used in military and civilian fields, typically operating in relatively harsh environments such as high and low temperatures. Current passive thermal compensation optical systems in infrared thermal imagers suffer from high and low temperature compensation group issues. To ensure the consistency of the compensation group during high and low temperature operation and to guarantee zero hysteresis in the compensated images during field-of-view switching, compression springs are generally used to eliminate gaps between structures, ensuring the performance requirements of the infrared thermal imager. Traditional infrared thermal imagers typically mount the spring on a lead screw shaft. Rotation of the lead screw shaft compresses the spring to eliminate the gap between the lead screw and the irregularly shaped nut. However, the selection of spring length, wire diameter, and pitch parameters is complex, and the varying compression length of the compensation group at different positions results in inconsistent elastic force, leading to inconsistent drive voltage requirements for the focusing motor at different positions, making the focusing motor control difficult. Summary of the Invention

[0003] To address the above shortcomings, this invention provides a gap-eliminating structure based on the high and low temperature compensation group of an infrared optical system. By using the constant elastic force of a compression spring, the gap in the compensation group during the compensation process is eliminated, ensuring that the compensation group has no hysteresis during the field of view switching process, and guaranteeing that the image has no hysteresis during the field of view switching process.

[0004] A backlash elimination structure based on a high and low temperature compensation group of an infrared optical system is characterized by comprising a compensation bracket, a guide rail, a slider, a compensation mirror assembly, and a compensation motor assembly. The compensation bracket is L-shaped and consists of a horizontal plate and a vertical plate. The guide rail is longitudinally fixed on the top surface of the horizontal plate of the compensation bracket. The slider is slidably mounted on the guide rail. The compensation mirror assembly is mounted on the upper part of the slider by a first screw. One end of the compensation motor assembly is mounted on the upper part of the vertical plate of the compensation bracket by a third screw. The side of the compensation motor assembly is connected to a non-circular nut by a second screw and is connected to the compensation mirror assembly by the non-circular nut.

[0005] The compensating motor assembly includes a compensating motor bracket, a compensating motor, a lead screw, a bearing, and an end cap. The compensating motor bracket is cylindrical with an opening at one end. The compensating motor is mounted on the rear end of the compensating motor bracket using a compensating motor fixing screw. A corresponding opening matching the compensating motor is made on the vertical plate of the compensating motor, allowing the compensating motor to pass through the vertical plate. One end of the lead screw is mounted on the output shaft of the compensating motor using a lead screw fixing screw. The middle shaft end of the lead screw has a lead screw thread section. The upper end of the shaped nut has a screw hole with a shaped nut thread section inside the screw hole. The shaped nut engages with the lead screw thread section through the shaped nut thread section, with a gap at the thread engagement. The lower end of the shaped nut extends out from the opening of the compensating motor bracket. The bearing is mounted on the shaft end of the lead screw. The end cap is mounted on the front end of the compensating motor bracket using an end cap screw and engages with the outer ring of the bearing.

[0006] The compensating lens assembly includes a compensating lens base, a compensating lens, a compensating lens frame, a backlash-eliminating spring, a backlash-eliminating moving shaft, and a backlash-eliminating moving shaft baffle. The compensating lens is glued to the compensating lens frame, and the compensating lens frame is installed on the upper part of the compensating lens base by compensating lens frame screws. The backlash-eliminating spring is installed at one end of the backlash-eliminating moving shaft, and the backlash-eliminating moving shaft is installed inside the compensating lens base. The backlash-eliminating moving shaft baffle is installed on one side of the compensating lens base by baffle screws and supports the backlash-eliminating moving shaft.

[0007] The compensation bracket also includes a triangular fixing plate, which is a right triangle and is vertically fixed at the connection between the horizontal plate and the vertical plate of the compensation bracket, and is not located on the side of the guide rail.

[0008] The beneficial effects of this invention are as follows: A backlash-eliminating spring is mounted on the backlash-eliminating shaft. Under the elastic force of the backlash-eliminating spring, one end of the shaft is brought close to the end cap. Under the reaction force of the spring, the compensating mirror assembly moves forward, thereby driving the irregularly shaped nut forward to eliminate the gap at the threaded connection between the irregularly shaped nut and the lead screw. Compared with the traditional spring backlash-eliminating mechanism, this invention eliminates the gap between the lead screw and the irregularly shaped nut by mounting the backlash-eliminating spring on the shaft of the backlash-eliminating shaft on the compensating mirror assembly. This results in good performance, high stability, and high reliability. By using the constant elastic force of the compressed spring to eliminate the gap during the compensation process of the compensation group, it ensures that there is no backlash in the compensation group during the field of view switching process, guaranteeing that the image is free of backlash during the field of view switching process. Compared with the traditional backlash-eliminating structure, this invention also reduces the control difficulty of the motor. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the compensation motor assembly structure of the present invention; Figure 3 This is a schematic diagram of the compensation mirror assembly structure of the present invention; Figure 4 This is a partial structural diagram of the compensation mirror assembly of the present invention; Figure 5 This is a schematic diagram of the backlash-free moving shaft structure of the present invention; Figure 6 This is a schematic diagram of the lead screw structure of the present invention; Figure 7 This is a schematic diagram of the irregular nut structure of the present invention.

[0010] The components are: 1-compensation bracket, 2-guide rail, 3-slider, 4-compensation mirror assembly, 5-compensation motor assembly, 6-first screw, 7-second screw, 8-third screw, 9-compensation motor bracket, 10-compensation motor, 11-lead screw, 12-lead screw fixing screw, 13-compensation motor fixing screw, 14-irregular nut, 15-bearing, 16-end cap, 17-end cap screw, 18-compensation mirror base, 19-compensation lens, 20-compensation mirror frame, 21-compensation mirror frame screw, 22-backlash elimination spring, 23-backlash elimination moving shaft, 24-backlash elimination moving shaft baffle, 25-baffle screw, 26-lead screw thread section, 27-irregular nut thread section. Detailed Implementation

[0011] Example 1: A backlash elimination structure based on a high and low temperature compensation group of an infrared optical system includes a compensation bracket 1, a guide rail 2, a slider 3, a compensation mirror assembly 4, and a compensation motor assembly 5. The compensation bracket 1 is L-shaped and consists of a horizontal plate and a vertical plate. The guide rail 2 is longitudinally fixed to the top surface of the horizontal plate of the compensation bracket 1. The slider 3 is slidably mounted on the guide rail 2. The compensation mirror assembly 4 is mounted on the upper part of the slider 3 by a first screw 6. One end of the compensation motor assembly 5 is mounted on the upper part of the vertical plate of the compensation bracket 1 by a third screw 8. The side of the compensation motor assembly 5 is connected to a non-circular nut 14 by a second screw 7, and the non-circular nut 14 is connected to the compensation mirror assembly 4. The compensation bracket 1 also includes a triangular fixing plate, which is a right triangle and is vertically fixed at the connection between the horizontal plate and the vertical plate of the compensation bracket 1, but is not located on the side of the guide rail 2.

[0012] The compensating motor assembly 5 includes a compensating motor bracket 9, a compensating motor 10, a lead screw 11, a bearing 15, and an end cover 16. The compensating motor bracket 9 is cylindrical and has an opening at one end. The compensating motor 10 is installed at the rear end of the compensating motor bracket 9 by a compensating motor fixing screw 13. An opening matching the compensating motor 10 is made at a corresponding position on the vertical plate of the compensating bracket 1 so that the compensating motor 10 passes through the vertical plate of the compensating bracket 1. One end of the lead screw 11 is mounted on the output shaft of the compensating motor 10 by a lead screw fixing screw 12. The middle shaft end of the lead screw 11 is provided with a lead screw thread section 26. The upper end of the shaped nut is provided with a screw hole and a shaped nut thread section 27 is provided in the screw hole. The shaped nut 14 is engaged with the lead screw thread section 26 of the lead screw 11 through the shaped nut thread section 27. There is a gap at the thread engagement. The lower end of the shaped nut 14 extends out from the opening of the compensating motor bracket 9. The bearing 15 is mounted on the shaft end of the lead screw 11. The end cap 16 is mounted on the front end of the compensating motor bracket 9 by an end cap screw 17 and is engaged with the outer ring of the bearing 15.

[0013] The compensating lens assembly 4 includes a compensating lens base 18, a compensating lens 19, a compensating lens frame 20, a backlash-eliminating spring 22, a backlash-eliminating moving shaft 23, and a backlash-eliminating moving shaft baffle 24. The compensating lens 19 is glued to the compensating lens frame 20. The compensating lens frame 20 is mounted on the upper part of the compensating lens base 18 by a compensating lens frame screw 21. The backlash-eliminating spring 22 is mounted on one end of the backlash-eliminating moving shaft 23. The backlash-eliminating moving shaft 23 is mounted inside the compensating lens base 18. The backlash-eliminating moving shaft baffle 24 is mounted on one side of the compensating lens base 18 by a baffle screw 25 and supports the backlash-eliminating moving shaft 23.

[0014] When in use, the compensating motor 10 is energized, the lead screw 11 rotates, driving the irregular nut 14 to move back and forth. Because the backlash elimination shaft 23 is equipped with a backlash elimination spring 22, under the action of the backlash elimination spring 22, one end of the backlash elimination shaft 23 is brought close to the end cover 16. Under the reaction force of the backlash elimination spring 22, the compensating mirror assembly 4 moves forward, thereby driving the irregular nut 14 to move forward to eliminate the gap at the threaded connection between the irregular nut 14 and the lead screw 11.

Claims

1. A gap-eliminating structure based on high and low temperature compensation group of infrared optical system for eliminating hysteresis, characterized in that: The device includes a compensation bracket, a guide rail, a slider, a compensation mirror assembly, and a compensation motor assembly. The compensation bracket is L-shaped and consists of a horizontal plate and a vertical plate. The guide rail is fixedly mounted longitudinally on the top surface of the horizontal plate of the compensation bracket. The slider is slidably mounted on the guide rail. The compensation mirror assembly is mounted on the upper part of the slider by a first screw. One end of the compensation motor assembly is mounted on the upper part of the vertical plate of the compensation bracket by a third screw. The side of the compensation motor assembly is connected to a special-shaped nut by a second screw and is connected to the compensation mirror assembly by the special-shaped nut. The compensation motor assembly includes a compensation motor bracket, a compensation motor, a lead screw, a bearing, and an end cap. The compensation motor bracket is cylindrical and has an opening at one end. The compensation motor is mounted on the rear end of the compensation motor bracket by compensation motor fixing screws, and an opening matching the compensation motor is made at a corresponding position on the vertical plate of the compensation bracket, allowing the compensation motor to pass through the vertical plate of the compensation bracket. One end of the lead screw is mounted on the output shaft of the compensation motor by lead screw fixing screws. The middle shaft end of the lead screw has a lead screw thread section. The upper end of the shaped nut has a screw hole and a shaped nut thread section is set in the screw hole. The shaped nut engages with the lead screw thread section through the shaped nut thread section, with a gap at the thread engagement. The lower end of the shaped nut extends out from the opening of the compensation motor bracket. The bearing is mounted on the shaft end of the lead screw. The end cap is mounted on the front end of the compensation motor bracket by end cap screws and is connected to the outer ring of the bearing. The compensating lens assembly includes a compensating lens base, a compensating lens, a compensating lens frame, a backlash-eliminating spring, a backlash-eliminating moving shaft, and a backlash-eliminating moving shaft baffle. The compensating lens is glued to the compensating lens frame, and the compensating lens frame is installed on the upper part of the compensating lens base by compensating lens frame screws. The backlash-eliminating spring is installed at one end of the backlash-eliminating moving shaft, and the backlash-eliminating moving shaft is installed inside the compensating lens base. The backlash-eliminating moving shaft baffle is installed on one side of the compensating lens base by baffle screws and supports the backlash-eliminating moving shaft.

2. The gap-eliminating structure based on the high and low temperature compensation group of an infrared optical system for eliminating hysteresis as described in claim 1, characterized in that... The compensation bracket also includes a triangular fixing plate, which is a right triangle and is vertically fixed at the connection between the horizontal plate and the vertical plate of the compensation bracket, and is not located on the side of the guide rail.

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