A Newtonian laser transmitter optical axis calibration device

Abstract

This invention discloses a Newtonian laser transmitter optical axis calibration device, employing a Newtonian telescope optical structure and integrating the observation and laser imaging optical paths. It includes a telescope tube, a target reticle, a wide-field-of-view camera, a narrow-field-of-view camera, a display screen, and a control box. The telescope tube houses a primary mirror and a secondary mirror. The target reticle is located at the focal point F of the primary mirror, and a target image is printed on it. This target image, when viewed through the primary mirror, generates a target at infinity for the operator to observe and aim. The wide-field-of-view camera and the narrow-field-of-view camera are located on either side of the telescope tube in front of the focal point F of the primary mirror, for direct observation of the target reticle and the laser spot imaged on it. The control box is connected to the wide-field-of-view camera, the narrow-field-of-view camera, and the display screen, for supplying power to the cameras and receiving video image signals, while simultaneously sending the received video image signals to the display screen for display. This invention improves the calibration accuracy of the laser transmitter.

Description

Technical Field

[0001] This invention relates to weaponry and equipment, specifically to a Newtonian laser transmitter optical axis calibration device. Background Technology

[0002] In actual weapon firing, once the shooter accurately aims at the target, the bullet will hit the target; that is, the aiming point and the point of impact are coincident.

[0003] In laser combat training, lasers are used to simulate bullet firing. Weapons are equipped with laser emitters that emit lasers to simulate bullets. Sensors are installed on targets; when a laser hits a target, the sensor detects it and outputs a signal. This signal is used to determine whether a hit has occurred, thus conducting the shooting training.

[0004] Common laser transmitters are mounted on gun barrels or cannon barrels. When the shooter fires the laser at a target, the laser should accurately hit the target. This is necessary to simulate actual combat and achieve the training objective. Therefore, the alignment of the laser's point of impact with the aiming line is crucial and directly affects the effectiveness of shooting training. For this reason, all laser transmitters must undergo optical axis calibration to ensure that the laser emission point and the aiming point are accurately aligned. To achieve this, appropriate instruments and devices are required to test whether this performance meets the requirements.

[0005] To ensure the aiming point and laser hit point are aligned, laser transmitters typically include optical axis adjustment capabilities. This allows for adjustment of the aiming optical path direction (optical axis), or the laser emission optical path optical axis; some transmitters offer both adjustment functions. Common calibration methods include:

[0006] Direct observation method: At a distance, first align the aiming point with the target, then locate the laser spot using observation equipment or sensors. Based on the deviation of the spot from the target, adjust the aiming optical axis of the transmitter or the laser emission optical axis, and then check the deviation again to see if the laser spot coincides with the aiming point. If there is still an error, continue to correct it until they are perfectly aligned. This method is direct and clear, but it is relatively primitive, inefficient, and easily affected by the external environment.

[0007] Instrument Testing Method: The ultimate goal of laser transmitter calibration is usually to make the laser emission optical axis parallel to the aiming line (or aiming optical axis). When the laser emission optical axis and the aiming optical axis are parallel, the laser spot can cover the aiming point well at different distances. Therefore, laser transmitter calibration usually adopts this parallelism principle. To test the parallelism, some instruments have been designed, such as "CN107238355A A Prism Reflection Calibrator and Its Calibration Method". In this method, the author cleverly utilizes the characteristics of a triangular prism, namely, the characteristic that the prism maintains parallelism of the incident and outgoing light paths under any orientation, solving the problem of adjusting the distance between the aiming line and the laser emission optical axis under a small window size. However, due to the difficulty and high cost of manufacturing and grinding this triangular prism, it is not conducive to mass production applications.

[0008] For aiming and laser emission optical axis parallelism calibration, laser rangefinders have similar requirements. For example, in the patent "CN212694025U A Laser Rangefinder Calibrator", the author used a transmissive collimator and a beam splitter for detection, which can achieve the corresponding measurement and calibration effect. However, the required optical components have high precision requirements, the system is complex to build, and the transmissive collimator is prone to chromatic aberration caused by different wavelengths. That is, the visible light for aiming and the emitted infrared laser have focusing imaging errors in the collimator, which affects the final accuracy of the system. Summary of the Invention

[0009] The purpose of this invention is to provide a Newtonian laser transmitter optical axis calibration device.

[0010] The technical solution for achieving the purpose of this invention is as follows: a Newtonian laser transmitter optical axis calibration device, which adopts a Newtonian telescope optical structure and combines the observation optical path and the laser imaging optical path, including a telescope tube, a target reticle, a large field-of-view camera, a small field-of-view camera, a display screen, and a control box, wherein:

[0011] The lens tube is equipped with a primary mirror and a secondary mirror. The primary mirror is a concave reflecting mirror, and the secondary mirror is a plane reflecting mirror, and they are tilted at a 45° angle to the optical axis.

[0012] The target reticle is located at the focal point F of the primary mirror and has a target image printed on it. This target image, when passed through the primary mirror, can generate a target at infinity for the operator to view and aim at.

[0013] The large field-of-view camera and the small field-of-view camera are located on both sides of the lens tube in front of the focal point F of the main lens, and are used to directly observe the target reticle and the laser spot imaged on it;

[0014] The control box is connected to a large field-of-view camera, a small field-of-view camera, and a display screen. It is used to supply power to the cameras and receive video image signals, while simultaneously sending the received video image signals to the display screen for display.

[0015] Furthermore, the wide field-of-view camera can observe the scene within an angle range of 'a', where the value of angle 'a' is between 30° and 70°; the narrow field-of-view camera can observe the scene within an angle range of 'b', where the value of angle 'b' is between 2° and 10°.

[0016] Furthermore, an entrance camera and a frosted glass plate are also provided. The entrance camera is placed inside the lens barrel, and the frosted glass plate is fixed at the entrance of the lens barrel. The entire frosted glass plate can be observed through the entrance camera to determine the incident situation of the incident laser beam.

[0017] Furthermore, the control box and the display screen are combined together, with a switch on the control box for turning the power of the entire device on or off, and a shift switch installed on the control box for switching cameras.

[0018] A method for calibrating the optical axis of a Newtonian laser transmitter, based on the aforementioned Newtonian laser transmitter optical axis calibration device, achieves optical axis calibration of the laser transmitter. The specific process is as follows:

[0019] Adjust the laser transmitter (1) and aim it at the distant target inside the lens tube (2) to ensure accurate aiming at the target;

[0020] After accurately aiming at the target, control the laser transmitter to emit a laser beam. The laser beam is reflected by the primary mirror (3) and the secondary mirror (4) and hits the target reticle (6), forming a laser spot on the target reticle (6).

[0021] At this point, switch to the large field-of-view camera (7), adjust the overall attitude angle of the laser transmitter, or the direction of the laser transmitting tube (1-2), so that the laser spot enters the central area of ​​the target reticle (6), then switch to the small field-of-view camera (8), further adjust the laser spot so that the center of the laser spot is strictly centered in the target pattern of the target reticle (6), and the calibration of the two optical axes of the laser transmitter is completed.

[0022] Furthermore, the above process involves first operating the laser transmitter (1) to accurately aim the sight (1-2) at the target, and then adjusting the laser to hit the laser spot at the center of the target. In some cases, it can also be reversed: first hit the laser spot at the center of the target, and then adjust the laser transmitter (1) to align the optical axis of the sight (1-2) with the center of the target, thus achieving the same effect of calibrating the laser transmitter.

[0023] Compared with existing technologies, the significant advantages of this invention are: 1) The device has a simple structure and is easy to construct. Compared with other types of calibration equipment, this device is ingeniously designed, easy to manufacture and process, has no difficult-to-process parts, and is easy to mass-produce. 2) The device is easy to operate. Observing and searching for targets is intuitive and convenient, and the gear switching is very simple and easy to operate. 3) Because this device adopts a reflective optical structure, it will not produce imaging deviations caused by the wavelength difference between infrared and visible light, completely solving the color difference problem caused by different wavelengths in the transmission system, and ultimately improving the working accuracy of the device. 4) This device adopts a method of using a single primary mirror for both aiming and laser imaging optical paths, realizing the merging of the two optical paths into one, avoiding the errors of two separate optical paths, and contributing to ensuring the working accuracy of the device. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the calibration principle of a laser transmitter.

[0025] Figure 2 This is a schematic diagram of the structure of a Newtonian telescope.

[0026] Figure 3 This is a diagram showing the overall layout of the system.

[0027] Figure 4 To calibrate the measurement status diagram.

[0028] Figure 5 The blank image observed by a wide field-of-view camera.

[0029] Figure 6 The blank image observed by a small field-of-view camera.

[0030] Figure 7 An image showing laser spots as observed by a wide field-of-view camera.

[0031] Figure 8 An image of a laser spot adjusted to the center area as observed by a wide field-of-view camera.

[0032] Figure 9 An image showing a laser spot as observed by a small field-of-view camera.

[0033] Figure 10 A schematic diagram showing that the laser spot observed by the small field-of-view camera is accurately located in the center position.

[0034] Figure 11 This is a schematic diagram of the aiming reticle in a scope.

[0035] Figure 12 The pattern seen in the scope when the scope is aligned with the center of the target reticle.

[0036] Figure 13 This is a schematic diagram showing the observation from the laser incident position.

[0037] Figure 14 This is a schematic diagram showing the deviation of the laser beam at the entrance port.

[0038] Figure 15 This is a schematic diagram of the control box display screen.

[0039] The meaning of the serial numbers in the attached diagram:

[0040] 1-Laser transmitter, 1-1Sight scope, 1-2Laser transmitter tube, 2-Tube, 3-Primary scope, 4-Secondary scope, 5-Eyepiece, 6-Target reticle, 7-Large field-of-view camera, 8-Small field-of-view camera, 9-Entrance camera, 10-Frosted glass plate, 11-Display screen, 12-Control box.

[0041] Meaning of characters in the attached diagram:

[0042] L - Laser emission axis, A - Aiming axis, E - Eye, F - Focus, P - Laser spot, T - Lens tube entrance step, a - Large field of view, b - Small field of view, c - Entrance field of view, PR - Entrance laser beam cross-section, S - Incident laser beam, K - Switch, D - Large field of view setting, X - Small field of view setting, G - Entrance field of view setting. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0044] To achieve a simple structure, high precision, and ease of operation, this invention designs a calibration device for a Newtonian reflector laser transmitter. Based on the basic structure of a Newtonian reflector telescope, this device incorporates a target reticle and a multi-channel image acquisition system. It solves the chromatic aberration problem caused by the difference in wavelengths between visible and infrared light, and provides users with various convenient operating methods, ensuring optical axis calibration accuracy and improving work efficiency.

[0045] As attached Figure 1 As shown, a laser transmitter 1 typically includes a sight 1-1 and a laser emitting tube 1-2. The calibration of the laser transmitter involves adjusting the optical axis L of the laser emitting tube 1-2 and the aiming optical axis A of the sight 1-1 through observation by a calibration and testing device, ensuring they are parallel.

[0046] The structure of a classic Newtonian telescope is shown in the attached figure. Figure 2As shown. A Newtonian telescope uses the principle of imaging and observation through a primary mirror. The telescope tube 2 contains a primary mirror 3, a secondary mirror 4, and an eyepiece 5. The primary mirror 3 is a concave mirror. The secondary mirror 4 is a plane mirror, tilted at a 45° angle to the optical axis. An opening is made on the side of the secondary mirror 4 to allow light to pass through, and the eyepiece 5 is mounted there. Light rays from afar are reflected by the primary mirror and converge, then reflected and deflected by the secondary mirror 4, converging to form an image on the side. This central focal point is the focal point F of the primary mirror 3. The plane passing through this focal point and perpendicular to the light path is the focal plane, and the image is formed on this focal plane. This image is observed through the eyepiece 5, allowing a magnified view of the distant scene, thus fulfilling the basic function of the telescope.

[0047] A classic Newtonian telescope views images through transmission, that is, by observing the transmitted image through eyepiece 5 behind the focal point F. The device of this invention, however, employs a reflective observation method, which is fundamentally different from a conventional Newtonian telescope.

[0048] The device of this invention adopts a basic Newtonian telescope optical structure, combining the observation optical path and the laser imaging optical path into one, using a single primary mirror for imaging. The telescope tube 2 contains a primary mirror 3 and a secondary mirror 4. The primary mirror 3 is a concave reflecting mirror. The secondary mirror 4 is a plane reflecting mirror, tilted at a 45° angle to the optical axis.

[0049] The device of this invention does not have an eyepiece; instead, a target observation mechanism is designed nearby, with the following structure: a target reticle 6, a large field-of-view camera 7, and a small field-of-view camera 8. An entrance camera 9 and a frosted glass plate 10 are also included. (See attached diagram) Figure 3 As shown. The signals from the above cameras are all connected to the control box 12. By switching the switch on the control box 12, the image of the selected camera is switched and displayed on the display screen 11.

[0050] Target Retrieval Board 6 is a whiteboard on which the target graphic is printed, as shown in the attached image. Figure 5 As shown, this device has a large field-of-view camera 7 and a small field-of-view camera 8 positioned on either side in front of the focal point F to directly observe the target reticle 6 and the laser spot imaged on it. Therefore, both cameras observe images formed by reflected light from the target reticle 6.

[0051] The calibration measurement status is as follows: Figure 4 As shown, at this point, the frosted glass plate 10 at the entrance is removed and placed aside, allowing the laser beam L to directly enter the large mirror tube 2. A target reticle 6 is positioned at the focal point F of the primary mirror, and the target reticle 6 has a reticle pattern, as shown in the attached diagram. Figure 5 (The image is an example; you can design different graphics as needed.) See attached... Figure 4 In the middle, an observer at point L or A, looking into tube 2, can see a magnified image in the distance, which is the attached image. Figure 5The image shown is a distant graphic. This graphic serves as a target for calibration work, where staff operate the laser transmitter, aiming at the target and firing the laser through a scope.

[0052] As described above, the target is generated by imaging the target reticle through the primary mirror; the incident laser is focused by the primary mirror and then imaged onto the target reticle. Therefore, the target observation optical path and the laser imaging optical path work together through the primary mirror and share the same optical element of the primary mirror.

[0053] As attached Figure 4 As shown, a wide-field-of-view camera 7 and a narrow-field-of-view camera 8 are installed on the side of the lens barrel 2. Because these two cameras have different viewing angles, their observed ranges are also different. The wide-field-of-view camera 7 can observe the scene within angle 'a', and when no laser is emitted, it can see the scene as shown in the attached image. Figure 5 The diagram shown represents the entirety of the target reticle. The small field-of-view camera 8 can observe the scene within angle b, as shown in the attached diagram. Figure 6 As shown, this is the central area of ​​the target reticle 6; therefore, the image is a magnified view of the attached... Figure 5 An image of the central region can reveal more details of that region, thus improving the observation accuracy of the central region.

[0054] The observed field of view is mainly related to the focal length of the lens on the camera. The same camera with a short focal length lens will have a large field of view, while with a long focal length lens it will have a small field of view. Just as a camera can use a short focal length fisheye lens to shoot wide-angle scenes, a long focal length lens is needed to shoot small objects at a distance (such as a distant bird, where the field of view is very small for the camera). In this invention, the field of view 'a' can be between 30° and 70°. For example, if the camera output shows a 70° field of view, the laser beam hitting the edge corner of the target reticle 6 can be seen and detected. The field of view 'b' can be around 2° to 10°. For example, with a 3° field of view, the camera image only shows a small area on the target reticle, but this small area fills the frame, so the details within it can be seen very clearly.

[0055] As attached Figure 4 As shown in the diagram, after removing the frosted glass plate 10 at the entrance, looking inwards through the entrance of the lens tube 2, one can see the following: Figure 5 The target image shown is located at infinity. A laser beam can be directly injected into the lens tube 2 to emit laser light towards the distant target. The laser beam is then reflected by the primary mirror 3 and secondary mirror 4 and strikes the target reticle 6, where it can be captured by the wide-field-of-view camera 7. The image can be viewed on the display screen as shown in the attached image. Figure 7 The image shown is where P is the laser spot (light point).

[0056] After the laser transmitter is set up, the initial laser beams are random and cannot accurately hit the center of the target reticle. They will generally appear at any position, as shown in the attached image. Figure 7 The laser spot is located in the upper right corner, not in the center of the framed area. This laser spot, being far from the center, will not be visible in images from a small field-of-view camera. Adjust the laser emitter's overall attitude angle, or the direction of laser emitting lenses 1-2, so that the laser spot enters the center of the framed area, as shown in the attached diagram. Figure 8 As shown in the attached image. Switching to display the image from the smaller field-of-view camera will then show the image as shown in the attached image. Figure 9 The image shown. Further adjustments to the laser spot are made so that the center of the laser spot is strictly centered within the box, as shown in the attached image. Figure 10 As shown, this achieves the effect of the laser accurately hitting the center of the target. The calibration of the two optical axes of the laser transmitter is now complete.

[0057] During the aforementioned observation process, the large field-of-view camera 7 is used to observe and search for the laser spot, while the small field-of-view camera 8 is used to magnify and observe the position of the laser spot in the central area, and to perform precise spot adjustment.

[0058] In the appendix Figure 4 When viewed through the scope 1-1 by eye E, the reticle lines of the scope itself can be seen, as shown in the attached diagram. Figure 11 The crosshairs shown indicate the aiming point, and the direction pointed to by this aiming point is the aiming optical axis of the scope. When the scope 1-1 is aimed into the scope tube 2 and accurately aimed at the center of the target's reticle, the scope should show the following: Figure 12 The pattern shown indicates that the crosshair aiming point is located at the center of the target box.

[0059] This invention's device enables the laser transmitter to aim at a target and also displays the point of impact of the laser beam. When the aiming scope is attached... Figure 12 The target is aimed as shown, and the image from the small field-of-view camera shows the following: Figure 10 The centered state of the laser spot indicates that the laser emission axis and aiming axis of the laser transmitter have reached a precise parallel state, and the optical axis calibration of the laser transmitter has been completed.

[0060] In some cases, the opposite can also be done: first, the laser spot is hit on the center of the target, and then the laser transmitter (1) is adjusted so that the optical axis of the aiming scope (1-2) is aligned with the center of the target, thus achieving the same effect of calibrating the laser transmitter.

[0061] Since laser beams are usually infrared light, their location cannot be directly seen by the human eye, and sometimes appearances may occur as shown in the attached image. Figure 13The situation shown illustrates that the laser transmitter has deviated from its proper position, veering to the left edge. Consequently, the laser beam cannot completely enter the lens barrel, and in some cases, it may not enter at all, leading to problems such as incomplete beams, weak beams, or the inability to find a beam spot. To prevent this problem, this invention incorporates an entrance camera for observation. An entrance step T (as shown in the attached diagram) is designed at the entrance edge of the lens barrel. Figure 4 As shown in the diagram, place the frosted glass plate 10 into the step T, as per the attached diagram. Figure 13 As shown, an entrance camera 9 is installed inside the lens tube 2 to observe the frosted glass plate 10 installed on the entrance steps. The entrance camera 9 has a corresponding field of view c, which can observe the entire frosted glass plate, thereby observing the position of the incident laser beam.

[0062] The entrance camera 9 is positioned inside the entrance of the lens barrel 2, at an appropriate depth from the edge. Its function is to view the frosted glass panel 10, aiming for a complete view with minimal obstruction. When the camera is positioned deeper from the edge, away from the frosted glass panel and closer to the main mirror 3, the output image is better with less distortion. However, if the position is too deep, the camera's field of view is easily obstructed by the secondary mirror 4. When the camera is positioned shallower from the edge, close to the frosted glass panel, the lens needs a very short focal length, and the output image is prone to distortion. Therefore, the entrance camera 9 should be positioned as deep as possible from the edge while remaining unobstructed by the secondary mirror.

[0063] As attached Figure 13 As shown, when the laser beam hits the edge of the entrance, its state can be captured by the entrance camera 9, and the real-time situation can be seen on the display screen 11. (See attached image) Figure 14 As shown, the laser beam is no longer a complete circle on the frosted glass plate; a portion of it lies outside the entrance edge and cannot properly enter the lens tube. Therefore, this entrance image can be used to observe and check if the laser transmitter's position is appropriate. If a deviation is found, the laser transmitter's position is adjusted to ensure the laser beam enters completely, thereby improving the system's efficiency and accuracy. Generally, because laser light is infrared, its location is invisible to the human eye, often leading to wasted time due to the inability to locate the beam. With the entrance camera 9, the beam position can be quickly located, significantly improving work efficiency.

[0064] As attached Figure 15 As shown, the control box 12 and display screen 11 are combined for easy operation and viewing. The control box 12 has a switch K that can turn the power to the entire device on or off. A shift switch is installed on the box, pointing to "D", "X", and "G" respectively. The corresponding positions indicate that the control box is electrically connected to the large field-of-view camera 7, the small field-of-view camera 8, and the entrance camera 9, supplying power to the camera and receiving the corresponding video image signal, while simultaneously sending the received video image signal to the display screen 11 for display. (See attached image.) Figure 15This indicates the style for displaying images with a large field of view. (See attached image) Figure 13 and attached Figure 4 These represent the gear status and image style of the entrance field of view and the small field of view, respectively.

[0065] The above calibration method is mainly for laser transmitters equipped with a scope. Some laser transmitters may be equipped with other sights or may not have any sights at all. For these laser transmitters without a scope, this device can also be used to calibrate the laser optical axis. For example, with a very simple laser transmitter mounted on a rifle, the calibration is performed as follows: the shooter aims the front sight of the rifle at the center of the target box inside the scope tube 2 while keeping the rifle stationary. The laser spot of the transmitter is then moved. Finally, when the laser spot is centered in the small field of view image, the calibration of the rifle and the laser transmitter is complete. Transmitters with other aiming methods can also be calibrated using this device to ultimately achieve the parallelism between the aiming line and the laser optical axis.

[0066] In summary, the main design features of this invention are as follows: It adopts a basic layout based on a Newtonian telescope structure, using a reflective image observation method for optical axis observation and calibration of the laser transmitter. The observation optical path and the laser imaging optical path are combined, sharing a single primary mirror for imaging. Two cameras with different field of view are designed for searching and observing the laser point; an entrance frosted glass plate and a reverse camera are designed for observing the position of the incident laser. A control box is designed, including a display screen. The display screen shows the image of the target captured by the camera; the control box includes a shift switch to arbitrarily switch the displayed image. The use of a reflective optical structure eliminates deviations caused by the wavelength difference between infrared and visible light, completely solving the chromatic aberration problem and ultimately improving the device's working accuracy. The method of using a single primary mirror for both aiming and laser imaging optical paths achieves the integration of the two optical paths, avoiding the errors of two separate optical paths and ensuring the device achieves good working accuracy.

[0067] The aiming lines, aiming patterns, and reticle styles shown in the embodiments of the device of the present invention can be varied in form and are not limited to the styles shown in the accompanying drawings. Any similar variations are within the protection scope of the device of the present invention.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A Newtonian laser transmitter optical axis calibration device, characterized in that, It adopts a Newtonian telescope optical structure and combines the observation optical path and the laser imaging optical path into one, sharing a single primary mirror. The system includes a telescope tube (2), a target reticle (6), a wide field-of-view camera (7), a small field-of-view camera (8), a display screen (11), and a control box (12), wherein: The primary mirror (3) and secondary mirror (4) are provided inside the lens tube (2). The primary mirror (3) is a concave reflecting mirror, and the secondary mirror (4) is a plane reflecting mirror, and is tilted at a 45° angle to the optical axis. The target reticle is located at the focal point F of the main mirror, and a target image is printed on it. After the target image passes through the main mirror (3), it can generate a target at infinity for the operator to view and aim. The large field-of-view camera (7) and the small field-of-view camera (8) are located on both sides of the lens tube in front of the focal point F of the main mirror, and are used to directly observe the target reticle (6) and the laser spot imaged on it; The control box (12) is connected to the large field-of-view camera (7), the small field-of-view camera (8) and the display screen (11), and is used to supply power to the camera and access the video image signal, and at the same time send the accessed video image signal to the display screen (11) for display. The large field-of-view camera (7) can observe the scene within the angle range a, where the angle a is between 30° and 70°; the small field-of-view camera (8) can observe the scene within the angle range b, where the angle b is between 2° and 10°; the signal output terminals of the large field-of-view camera (7) and the small field-of-view camera (8) are respectively connected to the control box (12), and the display is switched by the control box (12).

2. The optical axis calibration device for a Newtonian laser transmitter according to claim 1, characterized in that, An entrance camera (9) and a frosted glass plate (10) are also provided. The entrance camera (9) is set inside the lens tube (2), and the frosted glass plate (10) is fixed at the entrance of the lens tube. The entire frosted glass plate (10) can be observed through the entrance camera (9) to determine the incident situation of the incident laser beam.

3. The optical axis calibration device for a Newtonian laser transmitter according to claim 1, characterized in that, The control box (12) and the display screen (11) are combined together. The control box (12) is equipped with a switch for turning the power of the whole device on or off. The control box (12) is also equipped with a shift switch for switching cameras.

4. A method for calibrating the optical axis of a Newtonian laser transmitter, characterized in that, Based on the Newtonian laser transmitter optical axis calibration device according to any one of claims 1-3, the optical axis calibration of the laser transmitter is achieved, and the specific process is as follows: Adjust the laser transmitter (1) and aim it at the distant target inside the lens tube (2) to ensure that the target is being aimed at; After aiming at the target, control the laser transmitter to emit a laser beam. The laser beam is reflected by the primary mirror (3) and the secondary mirror (4) and hits the target reticle (6), forming a laser spot on the target reticle (6). At this point, switch to the large field-of-view camera (7), adjust the overall attitude angle of the laser transmitter, or the direction of the laser transmitting tube (1-2), so that the laser spot enters the central area of ​​the target reticle (6), then switch to the small field-of-view camera (8), further adjust the laser spot so that the center of the laser spot is strictly centered in the target pattern of the target reticle (6), and the calibration of the two optical axes of the laser transmitter is completed.

5. The optical axis calibration method for a Newtonian laser transmitter according to claim 4, characterized in that, Conversely, after the laser spot is first hit on the center of the target, the laser transmitter (1) is adjusted so that the optical axis of the aiming scope (1-1) is aligned with the center of the target, thus achieving the same effect of calibrating the laser transmitter.

Images