Gluing lens adjustable low-light-level night vision goggles objective lens and low-light-level night vision goggles

Abstract

The utility model discloses a low-light-level night vision goggle objective lens with adjustable cemented lenses and a low-light-level night vision goggle, which comprise an objective lens barrel, a first lens, a first cemented lens, a second cemented lens, a sixth lens, a first sleeve and a second sleeve, the first cemented lens and the second cemented lens are sequentially arranged in the first sleeve, and the second cemented lens is arranged in the sixth lens. A first sleeve and a sixth lens are sequentially arranged in the second sleeve; a first groove and a third groove are formed in the first sleeve, and a second groove, a fourth groove and a fifth groove are formed in the second sleeve. The optical axis center filling debugging can be independently carried out on the first bonding lens and the second bonding lens through the first sleeve, meanwhile, the center adjustment can be synchronously carried out on the sixth lens through the second sleeve, the mechanical shaft is used as a reference, the installation and adjustment are carried out in sequence according to an installation and adjustment path, and compared with a traditional installation and adjustment structure, the operation difficulty is reduced, and the installation and adjustment efficiency is improved. The adjustment time is saved, the adjustment efficiency is improved, and the system has higher optical axis consistency.

Description

Technical Field

[0001] The utility model relates to the technical field of low-light-level night vision goggles, in particular to a low-light-level night vision goggles objective lens with adjustable cemented lenses and the low-light-level night vision goggles. Background Art

[0002] Low-light-level night vision goggles utilize weak visible and near-infrared light to provide direct visual imagery in low-light conditions or under low-light conditions. However, the quality of the imaging directly impacts the observer's understanding of the surrounding environment. To achieve better observation, image quality, and stereoscopic perception, eliminate spherical and chromatic aberrations during the optical design process, improve image quality, reduce light loss, and increase image brightness, cemented lenses are essential in the optical design of the objective lens. To meet the requirements of optical path design, cemented lenses are increasingly being used in various applications. Cemented lenses are an essential and fundamental optical component in optical systems. Using optical-grade transparent adhesive, multiple lenses are bonded together to form a complex optical component to achieve specific optical effects.

[0003] Imaging systems composed of multiple cemented lenses inevitably experience a series of aberrations, such as coma and astigmatism, due to the presence of deviations (center deviations) between the optical axes of the individual cemented lenses and the system optical axis. This center deviation directly affects key parameters such as the system's resolution and range. Existing comprehensive testing systems for low-light-level optical system parameters, such as modulation transfer function (MTF) testers, can assess the quality of optical systems. However, MTF testing alone cannot reliably pinpoint the cause of a deteriorating system. The assembly accuracy of an optical system depends entirely on the machining accuracy of both machined and optical components. Once fabricated, optical axis misalignment errors between individual lenses within an optical system cannot be eliminated. To ensure that optical systems meet technical requirements, high-precision instrumentation is required during the assembly process to ensure that the accuracy of optical lens inspection and alignment meets design specifications. For objective systems with two sets of sensitive cemented lenses, center deviation calibration during assembly is crucial for ensuring optical axis consistency.

[0004] At present, the lens adjustment methods of low-light-level night vision goggles are divided into filling type and centering turning type. Centering turning is a centering turning technology that uses a centering lathe to turn the lens barrel. Centering turning has higher optical axis error adjustment accuracy, but because centering turning requires additional design of the lens frame and the lens barrel, the entire lens structure is larger. Low-light-level night vision goggles require a small lens size and a lightweight design, so centering turning is not applicable; Figure 1As shown, the filling type is to directly fill the lens 161 into the objective lens barrel 162, and inject the injection glue 164 into the gap between the objective lens barrel 162 and the lens 161 through the injection needle 163. The eccentricity and tilt of the optical axis are ensured by the matching gap between the objective lens barrel 162 and the lens 161. The advantage of the filling type is its compact structure and low cost.

[0005] The drop-in assembly of objective lenses is based on superior optical processing capabilities. A clearance is left between the lens barrel and the lens edge to prevent interference between the lens and the barrel during adjustment. The lens is adjusted and installed into the objective barrel, glued, and after the glue has cured, the lens is optically centered to achieve alignment of the objective's optical axis. In traditional lens assembly structures, spacers and pressure rings directly contact the lens surface, generating significant contact stress. In high-precision systems, this contact stress can affect image quality. The key advantage of drop-in centering assembly technology is that the mechanical components exert no pressure on the lens. In objective barrels assembled using this technique, there is no pressure ring in contact with the drop-in lens, resulting in no contact stress. However, since the glue required for drop-in lenses requires considerable time to cure, alignment is prohibitively long for multi-lens objective systems, particularly those with two sets of sensitive cemented lenses. This makes mass assembly unsuitable. Utility Model Content

[0006] The technical problem to be solved by the present utility model is to overcome the above-mentioned shortcomings and provide a low-light-level night vision goggle objective lens with adjustable cemented lenses, comprising a first sleeve 9 and a second sleeve 10, with an additional groove structure of a first groove 151, a second groove 152, a third groove 153, a fourth groove 154, and a fifth groove 155. The first sleeve 9 can be used to separately fill and debug the optical axis centers of the first cemented lens 2 and the second cemented lens 3, while the second sleeve 10 can be used to synchronously adjust the center of the sixth lens 4.

[0007] Specifically, the technical solution of the present utility model is:

[0008] A low-light-level night vision goggle objective lens with an adjustable cemented lens, comprising:

[0009] An objective lens barrel 11, a first sleeve 9 and a second sleeve 10 coaxially disposed within the objective lens barrel 11, and a first lens 1, a first cemented lens 2, a second cemented lens 3, and a sixth lens 4 disposed in sequence from the objective side to the image side within the objective lens barrel 11; the first sleeve 9 sequentially houses the first cemented lens 2 and the second cemented lens 3, and the second sleeve 10 sequentially houses the first sleeve 9 and the sixth lens 4;

[0010] The invention also includes: a first groove 151 and a third groove 153 are evenly arranged in sequence on the inner wall of the first sleeve 9, which are used to adjust and fix the positions of the first cemented lens 2 and the second cemented lens 3 relative to the center of the outer tube of the first sleeve 9; a second groove 152, a fourth groove 154 and a fifth groove 155 are evenly arranged in sequence on the inner wall of the second sleeve 10, which are used to adjust and fix the position of the sixth lens 4 and the center of the second sleeve 10.

[0011] Furthermore, it includes a first spacer 5, a second spacer 6, and a third spacer 7; the first spacer 5 is located between the second cemented lens 3 and the sixth lens 4, and is used to adjust the optical spacing between the second cemented lens 3 and the sixth lens 4; the second spacer 6 is located between the first cemented lens 2 and the second cemented lens 3, and is used to adjust the optical spacing between the first cemented lens 2 and the second cemented lens 3; the third spacer 7 is located between the first cemented lens 2 and the first lens 1 of the first sleeve 9, and is used to adjust the optical spacing between the first cemented lens 2 and the first lens 1;

[0012] Furthermore, it also includes an objective lens pressing ring 8 located between the first lens 1 and the second sleeve 10 , and the objective lens pressing ring 8 fixes the first lens 1 and the second sleeve 10 on the objective lens barrel 11 .

[0013] Preferably, the optical spacing is adjusted by the spacer by selecting and / or trimming the spacer.

[0014] Preferably, the center of the lens and / or the sleeve is fixed by squeezing glass soft adhesive into the first groove 151 , the second groove 152 , the third groove 153 , the fourth groove 154 and the fifth groove 155 .

[0015] Preferably, the low-light-level night vision goggle objective lens also includes a focusing handwheel 13 and a limit screw 14. The focusing handwheel 13 is fixed on the objective lens barrel 11 and is used to achieve focusing of the objective lens group; the limit screw 14 is fixed on the focusing handwheel 13 by a thread, and the focusing limit of the objective lens group is achieved by adjusting the position of the limit screw 14.

[0016] Preferably, the low-light-level night vision goggle objective lens further includes an O-ring 12 located between the objective lens barrel 11 and the focusing hand wheel 13, which is used for positioning, sealing, and controlling the rotational torque to improve hand comfort when focusing the objective lens.

[0017] A low-light-level night vision goggles comprising the low-light-level night vision goggles objective lens with a cemented lens that can be adjusted according to the utility model.

[0018] The method for adjusting the low-light-level night vision goggles objective lens using the utility model of the doublet lens adjustment includes:

[0019] S1, adjust the position of the second cemented lens 3 from the third groove 153 to ensure that the centers of the first sleeve 9 and the second cemented lens 3 coincide with each other, squeeze the glass soft glue into the third groove 153 to fix the position of the second cemented lens 3;

[0020] S2, after the first doublet lens 2 is installed in the first sleeve 9, the positions of the first doublet lens 2 and the second doublet lens 3 relative to the center of the first sleeve 9 are adjusted using the same method as step S1, and glass soft mounting glue is squeezed into the first groove 151 to fix the first doublet lens 2 in position. After the glass soft mounting glue is cured, the optical axes of the three lenses are aligned;

[0021] S3, ensuring the optical spacing between the second cemented lens 3 and the sixth lens 4 in the first sleeve group by trimming and selecting the first spacer 5; ensuring the optical spacing between the first lens 1 and the first cemented lens 2 in the first sleeve group by trimming and selecting the third spacer 7;

[0022] S4, adjust the center position of the sixth lens 4 and the second sleeve 10, squeeze glass soft mounting glue into the fifth groove 155 and cure it; adjust the first groove 151 of the first sleeve 9, adjust the optical axis center of the first sleeve group and the sixth lens 4, and after the adjustment is completed, squeeze structural curing glue into the fourth groove 154 to ensure that the position of the first sleeve 9 is fixed; after the adjustment of the first lens 1 is completed, squeeze glass soft mounting glue into the second groove 152 and cure it to ensure that the optical centers of the first lens 1 and the first sleeve 9 coincide with each other.

[0023] S5, installing the second sleeve 10 into the objective lens barrel 11, adjusting the second groove 152, and realizing axial rotation of the second sleeve 10 relative to the objective lens barrel 11 to adjust the optical axis;

[0024] S6, through the adjustment of steps S1 to S5, the optical axis centers of the first lens 1, the first cemented lens 2, the second cemented lens 3, and the sixth lens 4 are all centered and coincide with the center of the objective lens barrel 11;

[0025] S7, use the objective lens pressing ring 8 to fix the second sleeve 10 on the objective lens barrel 11.

[0026] Beneficial effects of the utility model:

[0027] The utility model provides a low-light-level night vision goggle objective lens with adjustable doublet lenses. The objective lens comprises a first sleeve 9 and a second sleeve 10, and includes a first groove 151, a second groove 152, a third groove 153, a fourth groove 154, and a fifth groove 155. The first sleeve 9 allows the optical axis centering of the first and second doublet lenses 2 and 3 to be individually adjusted, while the second sleeve 10 allows the centering of the sixth lens 4 to be simultaneously adjusted. Using the mechanical axis as a reference, the objective lens is adjusted sequentially according to an adjustment path. Compared with conventional adjustment structures, this reduces operational difficulty, saves adjustment time, improves adjustment efficiency, and achieves higher optical axis consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 : A schematic diagram of filling and assembling a doublet lens of a low-light-level night vision goggles objective lens with adjustable doublet lens of the utility model.

[0029] Figure 2 : A schematic diagram of the adjustment structure principle of a low-light-level night vision goggle objective lens with adjustable cemented lens of the utility model.

[0030] Figure 3 : Schematic diagram of center adjustment of the first cemented lens and the second cemented lens of the present invention.

[0031] Figure 4 : The center adjustment intention of the second cemented lens, the sixth lens, the first cemented lens and the second cemented lens of the utility model.

[0032] Figure 5 : Schematic diagram of center adjustment of the first lens, the first cemented lens and the second cemented lens of the present invention. DETAILED DESCRIPTION

[0033] Example

[0034] like Figure 2 As shown, a low-light-level night vision goggle objective lens with adjustable cemented lens includes a first lens 1, a first cemented lens 2, a second cemented lens 3, a sixth lens 4, a first spacer 5, a second spacer 6, a third spacer 7, an objective lens pressure ring 8, a first sleeve 9, a second sleeve 10, an objective lens barrel 11, an O-ring 12, a focusing handwheel 13, a limit screw 14, etc.; the adjustment structure is composed of a first sleeve group, a second sleeve group and a third sleeve group of the objective lens.

[0035] like Figure 2 As shown, the focusing hand wheel 13 is connected to the objective lens barrel 11 by glue and fixed, and the limit screw 14 is fixed on the focusing hand wheel 13 by thread. By adjusting the position of the limit screw 14, the focus limit of the objective lens group can be achieved.

[0036] like Figure 3As shown, the focusing structure of the first sleeve assembly consists of a first sleeve 9, a second spacer 6, a first cemented lens 2, and a second cemented lens 3. First grooves 151 and third grooves 153 are evenly distributed on the first sleeve 9. A dedicated tool is used to adjust the position of the second cemented lens 3 through the third groove 153 to ensure that the centers of the first sleeve 9 and the second cemented lens 3 coincide. Glass soft-mount adhesive is squeezed into the third groove 153 to secure the position of the second cemented lens 3. After the first cemented lens 2 is installed in the first sleeve 9, the same method is used to adjust the positions of the first and second cemented lenses 2 and 3 relative to the center of the first sleeve 9. Glass soft-mount adhesive is squeezed into the first groove 151 to secure the position of the first cemented lens 2. After the glass soft-mount adhesive cures, the optical axes of the three lenses coincide.

[0037] like Figure 4 As shown, the second sleeve group focusing structure is composed of the first sleeve group ( Figure 3 ), the second sleeve 10, the sixth lens 4, the first spacer 5, the first lens 1, and the third spacer 7. The second cemented lens 3 and the first sleeve group ( Figure 3 ) in the optical spacing of the sixth lens 4. The third spacer 7 can be cut to ensure that the optical spacing between the first lens 1 and the first sleeve group ( Figure 3 ) in the optical spacing between the first cemented lens 2. The second sleeve 10 is evenly distributed with the second groove 152 and the fifth groove 155. The center position of the sixth lens 4 and the second sleeve 10 can be adjusted by a special tool. The glass soft glue is squeezed into the fifth groove 155 and solidified. The first sleeve group ( Figure 3 ) and the sixth lens 4 to perform optical axis center adjustment. After adjustment, squeeze the structural curing glue into the fourth groove 154 to ensure that the position of the first sleeve 9 is fixed. After the adjustment of the first lens 1 is completed, squeeze the glass soft mounting glue into the second groove 152 to ensure that the first lens 1 and the first sleeve group ( Figure 3 )The optical centers coincide.

[0038] like Figure 5 As shown, the objective lens third sleeve group focusing structure is composed of the second sleeve group ( Figure 4 ), objective lens barrel 11, objective lens pressing ring 8. The second sleeve group ( Figure 4 ) is inserted into the objective lens barrel 11. At this time, the second groove 152 can be adjusted by a special tool to realize the second sleeve group ( Figure 4 ) is rotated relative to the objective lens barrel 11 to adjust the optical axis. After the adjustment is completed, the objective lens pressing ring 8 is used to fix the second sleeve group ( Figure 4 ) on the objective lens barrel 11.

[0039] Through the above adjustment steps, the optical axis centers of the first lens 1 , the first cemented lens 2 , the second cemented lens 3 , and the sixth lens 4 are all centered and coincide with the center of the objective lens barrel 11 .

Claims

1. A low-light-level night vision goggle objective lens with adjustable cemented lens, characterized by: The invention comprises an objective lens barrel (11), a first sleeve (9) and a second sleeve (10) coaxially arranged in the objective lens barrel (11), and a first lens (1), a first cemented lens (2), a second cemented lens (3) and a sixth lens (4) arranged in sequence from the object side to the image side in the objective lens barrel (11), wherein the first sleeve (9) is provided with the first cemented lens (2) and the second cemented lens (3) in sequence, and the second sleeve (10) is provided with the first sleeve (9) and the sixth lens (4) in sequence; The invention also includes a first groove (151) and a third groove (153) uniformly arranged in sequence on the inner wall of the first sleeve (9) for adjusting and fixing the positions of the first cemented lens (2) and the second cemented lens (3) relative to the center of the outer cylinder of the first sleeve (9); and a second groove (152), a fourth groove (154) and a fifth groove (155) uniformly arranged in sequence on the inner wall of the second sleeve (10) for adjusting and fixing the position of the sixth lens (4) and the center of the second sleeve (10).

2. The adjustable low-light-level night vision goggle objective lens with a cemented lens according to claim 1, characterized in that: The optical lens further comprises a first spacer (5), a second spacer (6) and a third spacer (7); the first spacer (5) is located between the second cemented lens (3) and the sixth lens (4) and is used to adjust the optical interval between the second cemented lens (3) and the sixth lens (4); the second spacer (6) is located between the first cemented lens (2) and the second cemented lens (3) and is used to adjust the optical interval between the first cemented lens (2) and the second cemented lens (3); the third spacer (7) is located between the first cemented lens (2) and the first lens (1) of the first sleeve (9) and is used to adjust the optical interval between the first cemented lens (2) and the first lens (1).

3. The adjustable low-light-level night vision goggle objective lens of the cemented lens according to claim 1, characterized in that: It also includes an objective lens pressing ring (8) located between the first lens (1) and the second sleeve (10), and the objective lens pressing ring (8) fixes the first lens (1) and the second sleeve (10) on the objective lens barrel (11).

4. The adjustable low-light-level night vision goggle objective lens of the cemented lens according to claim 2, characterized in that: When adjusting the optical spacing through the spacer, it is achieved by selecting and / or trimming the spacer.

5. The adjustable low-light-level night vision goggle objective lens of the cemented lens according to claim 1, characterized in that: The positions of the lens and / or the center of the sleeve are fixed respectively by squeezing glass soft adhesive into the first groove (151), the second groove (152), the third groove (153), the fourth groove (154) and the fifth groove (155).

6. The adjustable low-light-level night vision goggle objective lens with a cemented lens according to any one of claims 1 to 5, characterized in that: The invention also comprises a focusing hand wheel (13) and a limiting screw (14); the focusing hand wheel (13) is fixed on the objective lens barrel (11) and is used to achieve focusing of the objective lens group; the limiting screw (14) is fixed on the focusing hand wheel (13) through a thread, and the focusing and limiting of the objective lens group are achieved by adjusting the position of the limiting screw (14).

7. The adjustable low-light-level night vision goggle objective lens of claim 6, characterized in that: It also includes an O-type sealing ring (12) located between the objective lens barrel (11) and the focusing hand wheel (13), which is used for positioning, sealing and controlling the rotation torque to improve the hand comfort when the objective lens is focused.

8. A low-light-level night vision goggles, characterized in that: The invention comprises a low-light-level night vision goggle objective lens with an adjustable cemented lens as described in any one of claims 1 to 7.

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