Device for calibrating optical axis of binocular low-light night vision device

Abstract

The utility model belongs to the technical field of optical gauges, and particularly discloses a device for calibrating an optical axis of a binocular low-light night vision device. A double-tube front mirror of the device is fixed to the upper portion of an adjusting frame, a field instrument is fixed to the upper portion of a supporting frame, the supporting frame, a supporting seat and the adjusting frame are sequentially arranged on a workbench, a cross reticle I is arranged in the field instrument, a base I of the supporting seat is placed on the surface of the workbench, a top plate is fixed to the top end of a connecting handle through the connecting handle, and a connecting plate is fixed to the upper surface of the top plate. The top of the connecting plate is provided with a dovetail groove which can be in sliding connection with a dovetail joint at the bottom of the binocular low-light night vision device, and the extending direction of the dovetail groove is parallel to the optical axis of the field instrument. According to the utility model, the binocular low-light night vision device can be directly clamped in the dovetail groove in a sliding manner through the dovetail joint for positioning, the calibration of the parallelism of the optical axis is realized through the cooperation of the field instrument and the double-tube front mirror, and the calibration device has the characteristics of simple structure, convenience in calibration, high result precision and reliability in positioning.

Description

Technical Field

[0001] The utility model relates to the technical field of optical inspection tools, and particularly relates to a device for checking the optical axis of a binocular low-light night vision device, which has a simple structure, convenient inspection, high result accuracy and low cost. Background Art

[0002] A low-light night vision device is an optoelectronic device that uses weak ambient light to observe in the dark or low-light conditions. Its core principle is to collect extremely weak light in nature (such as starlight, moonlight, etc.) through an optical system, and use an image intensifier for optoelectronic conversion and signal amplification, and finally present the enhanced image in front of the observer. The optical axis parallelism of a low-light night vision device refers to the optical axes of each lens or mirror in the optical system being kept consistent, so that light can pass through the system accurately and be focused on the image plane. Non-parallel optical axes will cause problems such as blurred images, double images or offsets, seriously affecting the observation effect. Therefore, the optical axis parallelism check is a key link to ensure the stable performance and clear image of a low-light night vision device.

[0003] Currently, the optical axis parallelism check of a low-light night vision device usually includes the direct observation method and the image analysis method. The direct observation method uses a collimator to generate parallel light rays, clamps and adjusts the low-light night vision device to a suitable position through a clamping device, directly observes the imaging picture of the low-light night vision device through the human eye, and judges the optical axis parallelism by combining the pattern on the resolution board. The aforementioned method is simple and intuitive, but the inspection of each low-light night vision device requires auxiliary work such as clamping, adjustment and disassembly, resulting in cumbersome operation and low inspection efficiency, and being greatly affected by the subjective factors of the observer. The image analysis method uses a camera processing system to capture the imaging picture of the low-light night vision device and analyzes it through image processing software to measure parameters such as the offset and deformation degree of a specific pattern in the image (such as a low-light night vision comprehensive tester). Although the aforementioned method can objectively evaluate the optical axis parallelism and has the advantages of high precision, repeatability and high automation; however, due to relying on its electronic equipment and algorithms, once the equipment fails or the algorithm has defects, it may affect the inspection effect, making its reliability not high; and because electronic equipment usually has high procurement and maintenance costs, it is difficult for enterprises with limited budgets or non-professional ones to bear; moreover, the performance of some electronic equipment may be affected in extreme environments such as high temperature, low temperature or strong electromagnetic interference, thus affecting the accuracy and stability of the inspection.

[0004] Therefore, how to realize the convenient inspection of the optical axis of a low-light night vision device with low cost is a technical problem that urgently needs to be solved by current small optical enterprises. Summary of the Utility Model

[0005] Aiming at the deficiencies in the prior art, the utility model provides a device for checking the optical axis of a binocular low-light night vision device, which has a simple structure, convenient inspection, high result accuracy and low cost.

[0006] The present utility model is realized as follows: It includes a workbench, a field viewer, a support base, a double-tube front lens, an adjusting frame, and a support frame. The double-tube front lens is fixedly arranged on the upper part of the adjusting frame. The field viewer is fixedly arranged on the upper part of the support frame. The support frame, the support base, and the adjusting frame are sequentially arranged on the tabletop of the workbench. A cross reticle I is arranged inside the field viewer. The support base includes a top plate, a base I, a connecting handle, and a connecting plate. The base I is placed on the tabletop of the workbench. The top plate is fixedly arranged at the top end of the connecting handle through the connecting handle. The connecting plate is detachably fixedly arranged on the upper surface of the top plate. A dovetail groove that can be slidably connected with the dovetail tenon at the bottom of the binocular low-light night vision device is arranged on the upper part of the connecting plate. The extending direction of the dovetail groove is parallel to the optical axis of the field viewer.

[0007] Further, three adjusting screws I connected by threads are circumferentially and evenly distributed on the base I. Anti-slip foot covers are arranged at the bottoms of the adjusting screws I.

[0008] Further, one side of the connecting plate away from the field viewer extends out of the end face of the top plate to form a cantilever part. The dovetail groove extends above the cantilever part. A locking screw hole is arranged vertically through the dovetail groove on the side of the cantilever part. A locking screw is threadedly connected from bottom to top in the locking screw hole.

[0009] Further, a concave blind hole is arranged at the top end of the locking screw hole in the dovetail groove. An anti-slip pad whose bottom abuts against the top end of the locking screw is slidably arranged in the blind hole.

[0010] Further, a light-shielding cylinder is fixedly arranged at one end of the field viewer facing the support base. The objective lens of the binocular low-light night vision device fixedly arranged on the support base extends into the light-shielding cylinder.

[0011] Further, the adjusting frame includes a base II, a bottom sleeve, a lifting rod, and a set screw II. Three adjusting screws II connected by threads are circumferentially and evenly distributed on the base II. The bottom sleeve is vertically fixedly arranged in the middle of the upper surface of the base II. The lower part of the lifting rod slides into the bottom sleeve. The set screw II is arranged on the side wall of the bottom sleeve to lock the lifting rod in the bottom sleeve. The double-tube front lens is detachably fixedly connected to the top end of the lifting rod.

[0012] Further, a strip-shaped groove is axially arranged on one side of the upper part of the bottom sleeve. Connecting ears are arranged in parallel on both sides of the strip-shaped groove on the outer wall of the upper part of the bottom sleeve. Corresponding screw holes and through holes are arranged on the connecting ears on both sides of the strip-shaped groove coaxially. The set screw II passes through the through hole and is connected with the screw hole to tighten the connecting ears on both sides of the strip-shaped groove to lock the lifting rod in the bottom sleeve.

[0013] Furthermore, the support frame includes a clamp, a base III, a sliding sleeve, an adjusting screw, and an adjusting nut. The base III is placed on the workbench surface. Three adjusting screws III connected by threads are circumferentially and evenly distributed on the base III. The sliding sleeve is vertically and fixedly arranged on the base III between the three adjusting screws III. The clamp is fixedly arranged at the top end of the adjusting screw. The sighting instrument is detachably fixed in the clamp. The lower part of the adjusting screw slides and extends into the sliding sleeve. The adjusting nut is sleeved on the adjusting screw by thread connection, and the bottom end of the adjusting nut abuts against the top end of the sliding sleeve.

[0014] Furthermore, at least two set screw holes are circumferentially and evenly distributed on the side wall of the sliding sleeve. Set screws I are threadedly connected to the set screw holes. One end of each set screw I extending into the sliding sleeve abuts against the outer diameter of the adjusting screw.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. By providing a support frame with a dovetail groove, the present utility model can directly slide-connect the dovetail tenon at the bottom of the binocular low-light night vision device to the dovetail groove, thereby realizing the rapid positioning of the binocular low-light night vision device, that is, enabling the optical axis of the binocular low-light night vision device to be in a straight line with the sighting instrument and the double-barrel front sight, and then enabling the verification of the parallelism of the optical axis of the low-light night vision device. This avoids the cumbersome auxiliary operations such as clamping, adjustment, and disassembly during the verification of the existing low-light night vision devices, and improves the verification efficiency.

[0017] 2. Further, the present utility model forms a cantilever structure through the special design of the connecting plate, and sets a locking screw hole penetrating the dovetail groove in the cantilever part, and a locking screw is arranged in the locking screw hole; thus, a reliable connection is formed during the verification of the binocular low-light night vision device by tightening the dovetail tenon with the locking screw, avoiding the influence of vibration, etc. on the verification result. In particular, a blind hole is provided at the top end of the locking screw hole in the dovetail groove, and an anti-slip pad with the bottom abutted against the locking screw is slidably arranged in the blind hole. The anti-slip pad can be adjusted by the locking screw to abut against the dovetail tenon to fix the binocular low-light night vision device, improving the reliability of the binocular low-light night vision device during verification, and the anti-slip pad also avoids scratching the dovetail tenon by the locking screw.

[0018] 3. The present utility model sets a cross reticle I in the sighting instrument. By observing the deviation of the cross reticle I presented in the two eyepieces of the binocular low-light night vision device respectively through the double-barrel front sight, the parallelism value of the optical axis of the binocular low-light night vision device can be directly obtained. This can not only weaken the influence of the observer's subjective factors on the parallelism of the optical axis, but also has a relatively high reliability due to its all-mechanical structure, and also reduces the adverse influence of environmental factors on the verification result. Therefore, the verification result has a high precision, and the procurement and maintenance costs are relatively low.

[0019] In summary, the present utility model has the characteristics of simple structure, convenient verification, high result precision, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural view of the present utility model;

[0021] Figure 2 is a top view of the present utility model;

[0022] Figure 3 is a schematic structural view of the support base of the present utility model;

[0023] Figure 4 is a schematic structural view of the adjusting frame of the present utility model;

[0024] In the figures: 1 - workbench, 2 - field viewer, 3 - support base, 31 - top plate, 32 - base Ⅰ, 33 - connecting handle, 34 - connecting plate, 341 - dovetail groove, 342 - cantilever part, 35 - locking screw, 36 - adjusting screw Ⅰ, 37 - anti-slip foot cover, 38 - anti-slip pad, 4 - double-tube front sight, 5 - adjusting frame, 51 - base Ⅱ, 52 - adjusting screw Ⅱ, 53 - bottom sleeve, 54 - lifting rod, 55 - locking screw Ⅱ, 56 - connecting ear, 6 - support frame, 61 - clamp, 62 - base Ⅲ, 63 - adjusting screw Ⅲ, 64 - sliding sleeve, 65 - adjusting screw rod, 66 - adjusting nut, 67 - locking screw Ⅰ, 7 - light-shielding cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] As Figures 1 to 4 shown, the present utility model includes a workbench 1, a field viewer 2, a support base 3, a double-tube front sight 4, an adjusting frame 5, and a support frame 6. The double-tube front sight 4 is fixedly arranged on the upper part of the adjusting frame 5. The field viewer 2 is fixedly arranged on the upper part of the support frame 6. The support frame 6, the support base 3, and the adjusting frame 5 are sequentially arranged on the tabletop of the workbench 1. A cross reticle Ⅰ is arranged inside the field viewer 2. The support base 3 includes a top plate 31, a base Ⅰ 32, a connecting handle 33, and a connecting plate 34. The base Ⅰ 32 is placed on the tabletop of the workbench 1. The top plate 31 is fixedly arranged at the top end of the connecting handle 33 through the connecting handle 33. The connecting plate 34 is detachably fixedly arranged on the upper surface of the top plate 31. A dovetail groove 341 that can be slidably connected with the dovetail tenon at the bottom of the binocular low-light night vision device is arranged on the upper part of the connecting plate 34. The extending direction of the dovetail groove 341 is parallel to the optical axis of the field viewer 2.

[0027] Three adjusting screws I 36 are circumferentially and evenly distributed on the base I 32 and are connected by threads. An anti-slip foot sleeve 37 is arranged at the bottom of the adjusting screw I 36.

[0028] One side of the connecting plate 34 away from the sighting instrument 2 extends out of the end face of the top plate 31 to form a cantilever part 342. The dovetail groove 341 extends above the cantilever part 342. A locking screw hole is arranged in the dovetail groove 341 and penetrates through the upper and lower parts on the side of the cantilever part 342. A locking screw 35 is screwed into the locking screw hole from bottom to top.

[0029] A concave blind hole is arranged at the top end of the locking screw hole in the dovetail groove 341. An anti-slip pad 38 whose bottom abuts against the top end of the locking screw 35 is slidably arranged in the blind hole.

[0030] One end of the sighting instrument 2 facing the support base 3 is fixedly provided with a light-shielding cylinder 7. The objective lens of the binocular low-light night vision instrument fixed on the support base 3 extends into the light-shielding cylinder 7.

[0031] A light-shielding soft cloth cylinder is further sleeved on one end of the light-shielding cylinder 7 facing the binocular low-light night vision instrument. An elastic closing opening that can be sleeved tightly on the objective lens of the low-light night vision instrument is arranged at one end of the light-shielding soft cloth cylinder facing the binocular low-light night vision instrument.

[0032] As Figure 4 shown, the adjusting bracket 5 includes a base II 51, a bottom sleeve 53, a lifting rod 54, and a set screw II 55. Three adjusting screws II 52 are circumferentially and evenly distributed on the base II 51 and are connected by threads. The bottom sleeve 53 is vertically and fixedly arranged in the middle of the upper surface of the base II 51. The lower part of the lifting rod 54 slides into the bottom sleeve 53. The set screw II 55 is arranged on the side wall of the bottom sleeve 53 to lock the lifting rod 54 in the bottom sleeve 53. The double-tube front sight 4 is detachably and fixedly connected to the top end of the lifting rod 54.

[0033] A strip-shaped groove is axially opened on one side of the upper part of the bottom sleeve 53. Connecting ears 56 are arranged in parallel on both sides of the strip-shaped groove on the outer wall of the upper part of the bottom sleeve 53. The connecting ears 56 on both sides of the strip-shaped groove are correspondingly provided with screw holes and through holes coaxially. The set screw II 55 penetrates through the through hole and is connected to the screw hole to tighten the connecting ears 56 on both sides of the strip-shaped groove to lock the lifting rod 54 in the bottom sleeve 53.

[0034] As Figure 1 and 2As shown, the support frame 6 includes a clamp 61, a base III 62, a sliding sleeve 64, an adjusting screw 65, and an adjusting nut 66. The base III 62 is placed on the tabletop of the workbench 1. There are three evenly circumferentially distributed adjusting screws III 63 threadedly connected to the base III 62. The sliding sleeve 64 is vertically and fixedly arranged on the base III 62 between the three adjusting screws III 63. The clamp 61 is fixedly arranged at the top end of the adjusting screw 65. The sighting instrument 2 is detachably fixed within the clamp 61. The lower part of the adjusting screw 65 slidably extends into the sliding sleeve 64. The adjusting nut 66 is threadedly sleeved on the adjusting screw 65 and the bottom end of the adjusting nut 66 abuts against the top end of the sliding sleeve 64.

[0035] At least two set screws are evenly circumferentially distributed on the side wall of the sliding sleeve 64. A set screw I 67 is threadedly connected to the set screw hole. The end of the set screw I 67 extending into the sliding sleeve 64 abuts against the outer diameter of the adjusting screw 65.

[0036] The working principle and process of the present utility model:

[0037] As Figures 1 to 4 shown, before calibration, the support frame 6, the support base 3, and the adjusting frame 5 are successively placed on the tabletop of the workbench 1. Then, according to the size of the binocular low-light night vision instrument to be tested, the three evenly distributed adjusting screws I 36 on the base I 32 are adjusted respectively so that when the dovetail tenon of the binocular low-light night vision instrument to be tested is slidably clamped in the dovetail groove 341, it is in a horizontal state and the optical axis height is suitable; if necessary, the support frame 6 and the adjusting frame 5 can also be adjusted so that the sighting instrument 2 and the double-tube front sight 4 are on the same straight line as the optical axis of the binocular low-light night vision instrument fixed on the support base 3, completing the preparation of the calibration device.

[0038] During calibration, first adjust the focal length of the binocular low-light night vision instrument to be tested. Slide the dovetail tenon of the binocular low-light night vision instrument to be tested into the dovetail groove 341. Then adjust the locking screw 35 so that the anti-slip pad 38 abuts tightly against the dovetail tenon in the dovetail groove 341, making the objective lens of the binocular low-light night vision instrument to be tested extend into the light-shielding cylinder 7, and the eyepiece is opposite to the two lens bodies of the double-tube front sight 4. Subsequently, observe the deviation of the cross reticle I presented in the two eyepieces of the binocular low-light night vision instrument through the double-tube front sight 4, so as to directly obtain the optical axis parallelism value of the binocular low-light night vision instrument. Finally, judge whether it is qualified according to the optical axis parallelism value. The unqualified binocular low-light night vision instrument is adjusted according to the optical axis parallelism value, completing the calibration of the binocular low-light night vision instrument.

[0039] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A device for calibrating the optical axis of a binocular low-light-level night vision device, characterized in that: The invention comprises a workbench (1), a visual field meter (2), a support seat (3), a double-tube front mirror (4), an adjustment frame (5), and a support frame (6), wherein the double-tube front mirror (4) is fixedly arranged on the upper part of the adjustment frame (5), the visual field meter (2) is fixedly arranged on the upper part of the support frame (6), the support frame (6), the support seat (3) and the adjustment frame (5) are arranged on the table surface of the workbench (1) in sequence, the visual field meter (2) is provided with a cross-section plate I, and the support seat (3) comprises a top plate (31), a base I (32 ), a connecting handle (33), and a connecting plate (34), wherein the base I (32) is placed on the table top of the workbench (1), the top plate (31) is fixedly arranged on the top end of the connecting handle (33) through the connecting handle (33), the connecting plate (34) is detachably fixedly arranged on the upper surface of the top plate (31), and the upper part of the connecting plate (34) is provided with a dovetail groove (341) which can be slidably connected to the dovetail tenon at the bottom of the binocular low-light night vision device, and the extension direction of the dovetail groove (341) is parallel to the optical axis of the field meter (2).

2. The device for optical axis calibration of binocular low-light-level night vision device according to claim 1, characterized in that: Three threaded adjustment screws I (36) are evenly distributed circumferentially on the base I (32), and a non-slip foot cover (37) is provided at the bottom of the adjustment screw I (36).

3. The device for optical axis calibration of binocular low-light-level night vision device according to claim 1, characterized in that: The end surface of the top plate (31) extends out of the side of the connecting plate (34) away from the field meter (2) to form a cantilever portion (342), and the dovetail groove (341) extends to the top of the cantilever portion (342). A locking screw hole is provided in the dovetail groove (341) and passes through the cantilever portion (342) from top to bottom. A locking screw (35) is threadedly connected from bottom to top in the locking screw hole.

4. The device for optical axis calibration of binocular low-light-level night vision device according to claim 3 is characterized in that: A concave blind hole is provided at the top of the locking screw hole in the dovetail groove (341), and an anti-skid pad (38) is slidably provided in the blind hole, the bottom of which abuts against the top of the locking screw (35).

5. The device for optical axis calibration of binocular low-light-level night vision device according to any one of claims 1 to 4, characterized in that: A light shielding tube (7) is fixedly provided on one end of the visual field instrument (2) facing the support seat (3), and an objective lens of a binocular low-light-level night vision instrument fixed on the support seat (3) extends into the light shielding tube (7).

6. The device for calibrating the optical axis of binocular low-light-level night vision devices according to claim 5, characterized in that: The adjustment frame (5) comprises a base II (51), a bottom sleeve (53), a lifting rod (54), and a set screw II (55). Three threaded adjustment screws II (52) are evenly distributed on the circumference of the base II (51). The bottom sleeve (53) is vertically fixedly arranged in the middle of the upper surface of the base II (51). The lower part of the lifting rod (54) slides into the bottom sleeve (53). The set screw II (55) is arranged on the side wall of the bottom sleeve (53) to lock the lifting rod (54) in the bottom sleeve (53). The double-tube front mirror (4) is detachably fixedly connected to the top of the lifting rod (54).

7. The device for calibrating the optical axis of binocular low-light-level night vision devices according to claim 6, characterized in that: A strip groove is provided on one side of the upper portion of the bottom sleeve (53) in the axial direction. Connecting ears (56) are provided in parallel on both sides of the strip groove on the upper portion of the outer wall of the bottom sleeve (53). Screw holes and through holes are provided coaxially and correspondingly on the connecting ears (56) on both sides of the strip groove. The set screws II (55) pass through the through holes and are connected to the screw holes to tighten the connecting ears (56) on both sides of the strip groove to lock the lifting rod (54) in the bottom sleeve (53).

8. The device for optical axis calibration of binocular low-light-level night vision device according to claim 5, characterized in that: The support frame (6) comprises a clamp (61), a base III (62), a sliding sleeve (64), an adjusting screw (65), and an adjusting nut (66); the base III (62) is placed on the table top of the workbench (1); three threaded adjusting screws III (63) are evenly distributed circumferentially on the base III (62); the sliding sleeve (64) is vertically fixed on the base III (62) between the three adjusting screws III (63); the clamp (61) is fixedly arranged on the top of the adjusting screw (65); the visual field instrument (2) is detachably fixed in the clamp (61); the lower part of the adjusting screw (65) slides and extends into the sliding sleeve (64); the adjusting nut (66) is threadedly connected and sleeved on the adjusting screw (65) and the bottom end of the adjusting nut (66) abuts against the top end of the sliding sleeve (64).

9. The device for calibrating the optical axis of binocular low-light-level night vision devices according to claim 8, characterized in that: At least two fixing screw holes are evenly distributed circumferentially on the side wall of the sliding sleeve (64), and fixing screws I (67) are threadedly connected to the fixing screw holes. One end of the fixing screw I (67) that extends into the sliding sleeve (64) abuts against the outer diameter of the adjusting screw (65).

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