A portable night vision measuring instrument scale switching mechanism

Abstract

The application belongs to the field of micro-light photoelectric imaging and detection technology, and relates to a portable night vision measuring instrument scale switching mechanism, which comprises a rack, a high-contrast scale plate, a low-contrast scale plate, a worm gear, a light reduction sheet, a worm and a driving mechanism. The worm gear is rotatably connected to the rack. The high-contrast scale plate, the low-contrast scale plate and the two light reduction sheets are arranged on the worm gear. The high-contrast scale plate and the low-contrast scale plate are symmetrically arranged on the left and right sides of the worm gear. The two light reduction sheets are symmetrically arranged on the upper and lower sides of the worm gear. The upper end of the high-contrast scale plate is provided with a bright area I, and the lower end is provided with a dark area I. The upper end of the low-contrast scale plate is provided with a dark area II, and the lower end is provided with a bright area II. The device has the advantages of simple structure, low assembly difficulty, small space volume, light weight, good portability, ingenious design, impact resistance, long service life, good optical axis consistency, good process performance and the like. The device can realize the functions of self-correcting scale contrast and measuring night vision product discrimination rate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of micro-light photoelectric imaging and detection technology, and particularly relates to a portable night vision measuring instrument scale switching mechanism. BACKGROUND

[0002] In recent years, with the development of micro-light night vision technology, micro-light night vision equipment is more and more widely used in the field of national defense, such as tank driving instrument, gun (vehicle) long observation mirror, pilot night vision goggles, individual night vision weapon system, etc., which becomes an indispensable equipment in the night battle of information war and significantly improves the night combat capability.

[0003] In order to protect the maintenance, detection and maintenance of these night vision equipment, a portable night vision measuring instrument is needed to test various individual night vision goggles, gun sighting micro-light sighting scope, vehicle-mounted micro-light sighting scope, airborne pilot night vision helmet and other equipment on site, to provide reliable measurement and detection means for regular testing and maintenance of micro-light night vision equipment performance, so as to improve the performance of weapon equipment. The scale switching mechanism is an important guarantee for the portability of the night vision measuring instrument. The existing scale switching mechanism adopts a parallel bracket structure, which realizes scale switching through the guide rail movement of the high and low contrast scale plate parallel mechanism. However, it has the disadvantages of complex structure, difficult assembly, high precision requirement of parts, poor precision guarantee, large space volume, heavy weight and poor portability.

[0004] Therefore, there is an urgent need in the art to develop a portable night vision measuring instrument scale switching mechanism. SUMMARY

[0005] The purpose of the present application is to solve the above technical problems, and a portable night vision measuring instrument scale switching mechanism is proposed to solve the problems of large space occupation, heavy weight, complex structure, difficult assembly of components, high precision requirement of parts, poor precision guarantee and poor portability of the existing scale switching mechanism.

[0006] The technical scheme is as follows: a portable night vision measuring instrument scale switching mechanism, comprising a rack, a high-contrast scale plate, a low-contrast scale plate, a worm gear, a light reduction sheet, a worm and a driving mechanism, the rack comprises a base and a mounting seat one and a mounting seat two arranged in parallel and spaced above the base, the worm gear is rotatably connected to the mounting seat two, the high-contrast scale plate, the low-contrast scale plate and the two light reduction sheets are all arranged on the worm gear, and the high-contrast scale plate and the low-contrast scale plate are symmetrically arranged on the left and right sides of the worm gear, and the two light reduction sheets are symmetrically arranged on the upper and lower sides of the worm gear, the upper end of the high-contrast scale plate is provided with a bright area one, and the lower end is provided with a dark area one, the upper end of the low-contrast scale plate is provided with a dark area two, and the lower end is provided with a bright area two, the bright area one, the bright area two, the dark area one, the dark area two and the two light reduction sheets are evenly distributed along the axis of the worm gear, the mounting seat two is provided with an observation hole below, the mounting seat one is provided with an objective lens system, the objective lens system is arranged corresponding to the observation hole, the driving mechanism is connected to the mounting seat two, and the driving mechanism is in transmission connection with the worm, the worm is in meshing connection with the worm gear, when the bright area one, the bright area two, the dark area one, the dark area two and the two light reduction sheets are respectively adjusted to be coaxial with the observation hole, the bright area one, the bright area two, the dark area one, the dark area two and the two light reduction sheets are just located on the focal point position of the objective lens system.

[0007] Preferably, the driving mechanism adopts a servo stepping motor for accurately controlling the angle of each rotation of the worm gear.

[0008] Preferably, a micro switch mechanism is further included, the micro switch mechanism comprises a micro switch arranged on the mounting seat two and a contact column arranged on the worm gear, the micro switch is in electrical connection with the servo stepping motor, and when the contact column is rotated to abut against the micro switch and trigger the micro switch to act, the servo stepping motor can be controlled to return to zero position. During the rotation of the worm gear, the contact column on the worm gear touches the spring sheet of the micro switch, so that the micro switch is closed, and the servo stepping motor is fed back to return to zero position through the circuit, and then the worm gear is rotated to the bright area two of the low-contrast scale plate, which is a commonly used test position of night vision equipment, so that the empty return error is eliminated, and the test accuracy is ensured.

[0009] Preferably, bearing seats are rotatably connected to the two ends of the worm, and the bearing seats are fixedly connected to the mounting seat two for maintaining the stability of the worm, thereby ensuring the accuracy of the adjustment of the device.

[0010] Preferably, the objective lens system adopts an imaging system with a focal length of 475 mm and a clear aperture of 110 mm.

[0011] Preferably, the high-contrast scale plate and the low-contrast scale plate both adopt a low-light night vision discrimination rate plate, and both are seat scale plates, because the scale plate needs to be measured periodically, it is designed as a seat structure for convenient disassembly and assembly.

[0012] Preferably, both bright area one and bright area two are patterned areas, which facilitates observation.

[0013] The present invention also includes other components that enable the reticle switching mechanism of a portable night vision measuring instrument to function properly, all of which are conventional means in the art. In addition, devices or components not limited in the present invention, such as high-contrast reticles, low-contrast reticles, worm gears, worm shafts, servo stepper motors, objective lens systems, etc., all adopt existing technologies in the art.

[0014] The working principle of this invention is as follows: a drive mechanism drives a worm gear to rotate, which in turn drives a worm wheel. Bright area one, bright area two, dark area one, dark area two, and two neutral density filters, all positioned precisely on the worm wheel, rotate 60° each time. This allows them to be accurately and sequentially presented on the main optical path of the objective lens system, and also enables accurate positioning at 90°, 180°, and 270° rotations of the worm wheel. Therefore, one of the innovations of this mechanism lies in the perfect combination of electronic control and structural design, achieving precise measurement of contrast and resolution performance indicators with every 60° rotation of the worm wheel. This design not only meets the functional requirements of the product but also replaces the space-consuming and heavy parallel bracket structure, playing a crucial role in making the night vision measuring instrument portable. The second innovation of this mechanism lies in its ingenious design. After dividing the bright and dark areas on the high and low contrast reticle and spacing them, the light-transmitting area is used for correction. The entire circle is divided into equal parts at 60° intervals, which can achieve accurate positioning. At the same time, it is perfectly combined with the self-locking property of the worm gear mechanism, saving the limit locking mechanism of the parallel bracket mechanism. This not only saves space but also eliminates many processes such as the difficulty of adjusting the limit locking mechanism to achieve accurate positioning.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the device has a simple structure, which can reduce the assembly difficulty, and has a small volume, light weight, and good portability. It has the advantages of ingenious design, impact resistance, long life, good optical axis consistency, and good manufacturability. It can realize two functions: self-calibrating reticle contrast and measuring the discrimination rate of night vision products. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention in an embodiment.

[0017] Figure 2 for Figure 1 A schematic diagram of a partial cross-sectional view along the AA direction. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Example

[0020] like Figures 1-2As shown, this embodiment proposes a reticle switching mechanism for a portable night vision measuring instrument, including a frame 1, a high-contrast reticle 2, a low-contrast reticle 3, a worm gear 4, a neutral density filter 5, a worm 6, and a drive mechanism 7. The high-contrast reticle has a resolution of 85-90%, and the low-contrast reticle has a resolution of 35-40%. The frame includes a base 11 and two mounting seats 12 and 13, which are parallel to each other and spaced apart above the base. A worm gear is rotatably connected to the mounting seat 13 via a worm gear shaft. The high-contrast reticle, the low-contrast reticle, and the two neutral density filters are all mounted on the worm gear, with the high-contrast reticle and the low-contrast reticle symmetrically arranged on the left and right sides of the worm gear, and the two neutral density filters symmetrically arranged on the upper and lower sides of the worm gear. The high-contrast reticle has a bright area 21 at its upper end and a dark area 22 at its lower end. The low-contrast reticle has a dark area 31 at its upper end and a bright area 32 at its lower end. The bright area, bright area, dark area, dark area, and two neutral density filters are evenly distributed circumferentially along the axis of the worm gear. An observation hole 8 is provided below the mounting base 2. An objective lens system 9 is provided on the mounting base 1. The objective lens system is set correspondingly to the observation hole. The drive mechanism is connected to the mounting base 2 and is connected to the worm gear transmission. The worm gear is meshed with the worm wheel. When the drive mechanism drives the worm gear to rotate, the bright area, bright area, dark area, dark area, and two neutral density filters are adjusted to be coaxial with the observation hole, and are exactly located at the focal point of the objective lens system.

[0021] In this embodiment, the drive mechanism employs a servo stepper motor to precisely control the angle of each rotation of the worm gear. This embodiment also includes a micro switch mechanism, comprising a micro switch 10 mounted on the mounting base and a contact support 41 mounted on the worm gear. The micro switch is electrically connected to the servo stepper motor. When the contact support rotates to contact the micro switch and triggers its action, the servo stepper motor can be controlled to return to its zero position. During worm gear rotation, the contact support on the worm gear contacts the spring plate of the micro switch, causing the micro switch to close. Circuit feedback then returns the servo stepper motor to its zero position, and the worm gear rotates to the bright area two of the low-contrast reticle. This position is commonly used in night vision equipment testing, thus eliminating backlash error and ensuring testing accuracy.

[0022] More specifically, bearing seats 61 are rotatably connected to both ends of the worm gear, and the bearing seats are fixedly connected to the mounting base two to maintain the stability of the worm gear, thereby ensuring the accuracy of the device adjustment. The objective lens system adopts an imaging system with a focal length of 475mm and an aperture of 110mm. Both the high-contrast reticle and the low-contrast reticle are low-light night vision resolution plates, and both are reticles with mounting bases for easy assembly and disassembly. Bright area one and bright area two are both patterned areas (it should be noted that...). Figure 1The numbers in the patterns shown in Bright Zone 1 and Bright Zone 2 are part of the patterns, making them easier to observe.

[0023] The working principle of this invention is as follows: a drive mechanism drives a worm gear to rotate, which in turn drives a worm wheel. Bright area one, bright area two, dark area one, dark area two, and two neutral density filters, all positioned precisely on the worm wheel, rotate 60° each time. This allows them to be accurately and sequentially presented on the main optical path of the objective lens system, and also enables accurate positioning at 90°, 180°, and 270° rotations of the worm wheel. Therefore, one of the innovations of this mechanism lies in the perfect combination of electronic control and structural design, achieving precise measurement of contrast and resolution performance indicators with every 60° rotation of the worm wheel. This design not only meets the functional requirements of the product but also replaces the space-consuming and heavy parallel bracket structure, playing a crucial role in making the night vision measuring instrument portable. The second innovation of this mechanism lies in its ingenious design. After dividing the bright and dark areas on the high and low contrast reticle and spacing them, the light-transmitting area is used for correction. The entire circle is divided into equal parts at 60° intervals, which can achieve accurate positioning. At the same time, it is perfectly combined with the self-locking property of the worm gear mechanism, saving the limit locking mechanism of the parallel bracket mechanism. This not only saves space but also eliminates many processes such as the difficulty of adjusting the limit locking mechanism to achieve accurate positioning.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reticle switching mechanism for a portable night vision measuring instrument, comprising a frame, a high-contrast reticle, and a low-contrast reticle, characterized in that: It also includes a worm gear, neutral density filters, a worm, and a drive mechanism. The frame includes a base and two mounting seats, one parallel and spaced apart above the base. The worm gear is rotatably connected to the second mounting seat. The high-contrast reticle, the low-contrast reticle, and the two neutral density filters are all mounted on the worm gear. The high-contrast reticle and the low-contrast reticle are symmetrically arranged on the left and right sides of the worm gear, and the two neutral density filters are symmetrically arranged on the upper and lower sides of the worm gear. The high-contrast reticle has a bright area at its upper end and a dark area at its lower end. The low-contrast reticle has a dark area at its upper end and a dark area at its lower end. There is a bright area 2. Bright areas 1, 2, 1, 2, and two neutral density filters are evenly distributed circumferentially along the axis of the worm gear. An observation hole is provided below the mounting base 2. An objective lens system is provided on the mounting base 1. The objective lens system is set correspondingly to the observation hole. The drive mechanism is connected to the mounting base 2 and is connected to the worm gear transmission. The worm gear is meshed with the worm wheel. When the drive mechanism drives the worm gear to rotate, when bright areas 1, 2, 1, 2, and the two neutral density filters are respectively adjusted to be coaxial with the observation hole, they are exactly located at the focal point of the objective lens system.

2. The reticle switching mechanism of the portable night vision measuring instrument according to claim 1, characterized in that: The drive mechanism uses a servo stepper motor.

3. The reticle switching mechanism for the portable night vision measuring instrument according to claim 2, characterized in that: It also includes a micro switch mechanism, which includes a micro switch mounted on the mounting base and a contact support mounted on the worm gear. The micro switch is electrically connected to the servo stepper motor. When the contact support rotates to contact the micro switch and triggers the micro switch to operate, the servo stepper motor can be controlled to return to the zero position.

4. The reticle switching mechanism of the portable night vision measuring instrument according to claim 1, characterized in that: The two ends of the worm gear are rotatably connected to bearing seats, and the bearing seats are fixedly connected to the mounting base two.

5. The reticle switching mechanism of the portable night vision measuring instrument according to claim 1, characterized in that: The objective lens system uses an imaging system with a focal length of 475mm and an aperture of 110mm.

6. The reticle switching mechanism for a portable night vision measuring instrument according to claim 1, characterized in that: Both the high-contrast and low-contrast reticles are low-light night vision resolution plates, and both are mounted reticles.

7. The reticle switching mechanism for a portable night vision measuring instrument according to claim 1, characterized in that: Both bright area one and bright area two are patterned areas.

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