An assembling system for an infrared continuous zoom lens

Abstract

The utility model discloses a kind of for infrared continuous zoom lens's assembly and adjustment system.The system includes mechanical adjustment module, detection module and control module;Mechanical adjustment module includes adjustment table and adjustment frame, adjustment table is used to adjust the light axis pitch of lens and deflection angle, adjustment frame is used to carry lens tooling, realize the position adjustment and continuous zoom of lens horizontal direction;Detection module is used to monitor lens spacing and light axis offset amount in real time, also for real-time calculation image point offset amount;Control module is used to carry out light axis calibration and focal length calibration by adjustment table and adjustment frame according to the detection result of detection module.The utility model integrates multi-dimensional precision adjustment, real-time error detection and automatic calibration function, can realize the high-precision assembly and adjustment of infrared continuous zoom lens light axis offset amount≤10μm, focal length positioning accuracy≤5μm, simultaneously shorten single assembly and adjustment time to within 1 hour.

Description

Technical Field

[0001] This utility model relates to the field of infrared optical device technology, and more specifically, to an assembly and adjustment system for an infrared continuous zoom lens. Background Technology

[0002] Infrared continuous zoom lenses are widely used in military reconnaissance, security monitoring, and other fields, and their assembly and adjustment accuracy directly affects image quality. Existing assembly and adjustment technologies suffer from the following problems: 1. Low efficiency of manual adjustment: Relying on operators to manually adjust the lens position using tools such as dial indicators and centering instruments, a single assembly and adjustment can take more than 4 hours, and the accuracy is affected by human factors (optical axis offset error is typically >30μm); 2. Lagging detection feedback: Traditional detection equipment (such as collimators) requires offline detection and cannot provide real-time feedback of image quality data during the adjustment process, leading to repeated calibrations; 3. Multi-degree-of-freedom coupling problem: During lens zooming, the axial displacement and radial tilt of the focusing group and zoom group influence each other, and existing single-axis adjustment mechanisms struggle to achieve multi-dimensional coordinated control. Therefore, there is an urgent need for an assembly and adjustment system with high-precision automatic adjustment and real-time detection functions to overcome the above technical bottlenecks. Utility Model Content

[0003] In view of the above-mentioned defects or improvement needs of the existing technology, this utility model provides an assembly and adjustment system for infrared continuous zoom lenses, which integrates multi-dimensional precision adjustment, real-time error detection and automatic calibration functions. It can achieve high-precision assembly and adjustment of infrared continuous zoom lenses with optical axis offset ≤10μm and focal length positioning accuracy ≤5μm, while shortening the assembly and adjustment time of a single operation to less than 1 hour.

[0004] To achieve the above objectives, this utility model provides an assembly and adjustment system for an infrared continuous zoom lens, including a mechanical adjustment module, a detection module, and a control module. The mechanical adjustment module includes an adjustment table and an adjustment frame. The adjustment table is used to adjust the pitch and deflection angles of the lens's optical axis, and the adjustment frame is used to support the lens fixture, enabling horizontal position adjustment and continuous zoom of the lens. The detection module is used to monitor the lens spacing and optical axis offset in real time, and also to calculate the image point offset in real time. The control module is used to perform optical axis calibration and focal length calibration through the adjustment table and adjustment frame based on the detection results of the detection module.

[0005] In some implementations, the detection module is also used to monitor the lens temperature in real time, and the control module is also used to correct the effect of temperature changes on the lens spacing by adjusting the frame based on the detection results of the detection module.

[0006] In some embodiments, the adjustment platform includes a first support plate, a second support plate, an X-axis adjustment bracket, and a pitch adjustment bracket; the X-axis adjustment bracket enables the second support plate to move relative to the first support plate along the X-axis, and the pitch adjustment bracket enables the second support plate to change its pitch angle relative to the first support plate; the control module adjusts the pitch and deflection angles of the lens's optical axis through the X-axis adjustment bracket and the pitch adjustment bracket.

[0007] In some embodiments, the adjustment frame includes an X-axis drive motor, an X-axis translation slide, a Y-axis drive motor, a Y-axis translation slide, a Z-axis drive motor, and a Z-axis translation slide. During operation, the adjustment frame is mounted on a second support plate. The X-axis drive motor, under the control of the control module, drives the X-axis translation slide to move along the X-axis. The Y-axis drive motor, under the control of the control module, drives the Y-axis translation slide to move along the Y-axis. The Z-axis drive motor, under the control of the control module, drives the Z-axis translation slide to move along the Z-axis. The control module adjusts the horizontal position of the lens using the X-axis and Y-axis drive motors, and controls the axial displacement of the focusing group using the Z-axis drive motor, thereby achieving continuous zoom in conjunction with the zoom cam curve.

[0008] In some implementations, the detection module includes a laser ranging array; the laser ranging array includes multiple sets of laser rangefinders, which are respectively arranged on the object side and image side of the lens for real-time monitoring of lens spacing and optical axis offset.

[0009] In some implementations, the detection module further includes an image point offset detection unit; the image point offset detection unit includes an infrared target, a CCD imaging unit, and a calculation unit; the infrared target is used to project infrared images, the CCD imaging unit is used to acquire imaging images, and the calculation unit is used to calculate image point offsets.

[0010] In some implementations, the detection module further includes a temperature compensation unit; the temperature compensation unit includes a thermocouple sensor for detecting the lens temperature.

[0011] In some implementations, when the optical axis offset fed back by the laser ranging array is greater than a first preset value, the control module first drives the pitch adjustment bracket to correct the tilt angle, and then compensates for the displacement through the X-axis drive motor and the Y-axis drive motor until the optical axis offset is within a reasonable range.

[0012] In some implementations, when the image point offset reported by the image point offset detection unit is greater than a second preset value, the control module controls the Z-axis drive motor to drive the Z-axis translation carriage to move along a preset zoom curve until the image point offset is within a reasonable range.

[0013] In some implementations, when the lens spacing deviation caused by the temperature change fed back by the laser ranging array exceeds a third preset value, the control module calculates the correction value of temperature compensation based on the lens spacing deviation and the lens temperature detected by the temperature compensation unit, and controls the Z-axis drive motor to drive the Z-axis translation carriage to move, adjusting the lens spacing until the lens spacing deviation caused by the temperature change is within a reasonable range.

[0014] Overall, compared with the prior art, the above-described technical solution conceived by this utility model has the following beneficial effects: High-precision assembly and adjustment are achieved by combining a multi-dimensional adjustment mechanism with a laser ranging array, with optical axis offset ≤10μm and focal length positioning accuracy ≤5μm, which is 3 times higher than traditional manual assembly and adjustment; Real-time detection of optical axis offset and image point offset is achieved using detection and control modules, forming a feedback closed-loop control, reducing the single assembly and adjustment time to 40 minutes and supporting 24-hour batch production; The flexible clamping fixture is compatible with lenses of φ30-φ150mm diameter, and temperature compensation is achieved through a temperature detection unit and control module, ensuring stable operation of the infrared continuous zoom lens in an environment of -20℃~60℃, exhibiting high compatibility and reliability; The human-machine interface automatically records assembly and adjustment process data, which is traceable and facilitates quality control and process optimization. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the assembly and adjustment system for an infrared continuous zoom lens according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the adjustment table according to an embodiment of the present utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the adjustment frame according to an embodiment of the present invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, 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 merely illustrative of the present utility model and are not intended to limit the present utility model. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this application. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0019] like Figure 1As shown, the mounting and adjusting system for an infrared continuous zoom lens according to this embodiment of the invention includes a mechanical adjustment module 101, a detection module 103, and a control module 105. The mechanical adjustment module 101 employs a multi-dimensional adjustment mechanism, including an adjustment platform and an adjustment frame. The adjustment platform is used to adjust the pitch and deflection angles of the lens's optical axis, while the adjustment frame supports the lens fixture, enabling horizontal position adjustment and continuous zooming of the lens. The detection module 103 is used to monitor the lens spacing and optical axis offset in real time, calculate the image point offset in real time, and monitor the lens temperature in real time. The control module 105, based on the detection results from the detection module 103, performs optical axis calibration, focal length calibration, and corrects for the influence of temperature changes on the lens spacing (i.e., temperature compensation, with a compensation accuracy of ±3μm / 10℃) via the adjustment platform and adjustment frame.

[0020] like Figure 2 As shown, the adjustment platform of this embodiment includes a first support plate 201, a second support plate 203, an X-axis adjustment bracket 205, and a pitch adjustment bracket 207. The X-axis adjustment bracket 205 can adjust the second support plate 203, causing the second support plate 203 to move relative to the first support plate 201 along the X-axis. The pitch adjustment bracket 207 can adjust the second support plate 203, changing the pitch angle of the second support plate 203 relative to the first support plate 201 (with an accuracy of ±2 arcseconds). The control module 105 adjusts the pitch and deflection angles of the lens's optical axis via the X-axis adjustment bracket 205 and the pitch adjustment bracket 207.

[0021] like Figure 3 As shown, the adjustment frame of this embodiment includes an X-axis drive motor 301, an X-axis translation slide 302, a Y-axis drive motor 303, a Y-axis translation slide 304, a Z-axis drive motor 305, and a Z-axis translation slide 306. During operation, the adjustment frame is mounted on the second support plate 203. The X-axis drive motor 301, under the action of the control module 105, drives the X-axis translation slide 302 to move along the X-axis (accuracy ±2μm). The Y-axis drive motor 303, under the action of the control module 105, drives the Y-axis translation slide 304 to move along the Y-axis (accuracy ±2μm). The Z-axis drive motor 305, under the action of the control module 105, drives the Z-axis translation slide 306 to move along the Z-axis (stroke 50mm, accuracy ±1μm). The control module 105 adjusts the horizontal position of the lens through the X-axis drive motor 301 and the Y-axis drive motor 303, and controls the axial displacement of the focusing group through the Z-axis drive motor 305, thereby achieving continuous zooming in conjunction with the zoom cam curve.

[0022] In some implementations, the X-axis and Y-axis are horizontal and perpendicular to each other; the Z-axis is perpendicular to the plane containing the X-axis and Y-axis.

[0023] In some implementations, the lens fixture employs a flexible clamping structure and incorporates a built-in pressure sensor to monitor lens mounting stress, thus preventing mechanical deformation from affecting accuracy.

[0024] Furthermore, such as Figure 1 As shown, the detection module 103 includes a laser ranging array 107, an image point offset detection unit 109, and a temperature compensation unit 111. The laser ranging array 107 includes multiple laser rangefinders, respectively arranged on the object side and image side of the lens. For example, three laser rangefinders (with an accuracy of ±5μm) are arranged on both the object and image sides of the lens for real-time monitoring of lens spacing and optical axis offset. The image point offset detection unit 109 includes an infrared target, a CCD imaging unit, and a calculation unit. The infrared target projects an infrared image (e.g., a 1951 resolution plate infrared image with a wavelength of 8-14μm), which is then captured by the CCD imaging unit (e.g., a cooled CCD imaging unit). The calculation unit then calculates the image point offset. The temperature compensation unit 111 can be a thermocouple sensor, used to detect the lens temperature (e.g., in a mechanical adjustment module integrated on an optical isolation platform (flatness ≤1μm / m), thermocouple sensors are attached to the base of the optical isolation platform and the lens surface).

[0025] Furthermore, the control module 105 adopts a programmable logic controller (PLC) and integrates a fuzzy proportional-integral-derivative (PID) algorithm. After receiving the detection data from the detection module 103, it controls the mechanical adjustment module 101 according to the following logic.

[0026] Optical axis calibration: When the optical axis offset fed back by the laser ranging array 107 is greater than the first preset value (e.g., 5μm), the control module 105 first drives the pitch adjustment bracket 207 of the adjustment table to correct the tilt angle, and then compensates for the displacement through the X-axis drive motor 301 and the Y-axis drive motor 303 until the optical axis offset is within a reasonable range.

[0027] Focal length calibration: When the image point offset fed back by the image point offset detection unit 109 is greater than the second preset value (e.g., 10μm), the Z-axis drive motor 305 is controlled to drive the Z-axis translation carriage 306 to move according to the preset zoom curve until the image point offset is within a reasonable range.

[0028] Temperature compensation: When the lens spacing deviation caused by the temperature change fed back by the laser ranging array 107 is greater than the third preset value (e.g., 10μm), the correction value of temperature compensation is calculated based on the lens spacing deviation and the lens temperature detected by the temperature compensation unit 111, and the Z-axis drive motor 305 (e.g., a micro stepper motor) is controlled to drive the Z-axis translation slide 306 (e.g., a precision lead screw) to move, adjusting the lens spacing until the lens spacing deviation caused by the temperature change is within a reasonable range.

[0029] In some embodiments, the mounting and adjusting system for an infrared continuous zoom lens of this utility model further includes a human-machine interface (HMI) device, which supports manual / automatic mode switching of the mounting and adjusting system, displays mounting and adjusting parameters (such as optical axis offset, focal length, etc.) in real time, and generates mounting and adjusting reports.

[0030] In some implementations, multiple sets of airbag isolators (e.g., four sets of airbag isolators with a natural frequency ≤2Hz) are installed under the base of the optical vibration isolation platform to isolate external vibrations.

[0031] In some implementations, the Z-axis translation carriage 306 employs a ball screw and linear guide structure, equipped with a magnetic scale (resolution 0.1μm) to achieve full closed-loop position control.

[0032] In some implementations, the lens fixture is connected to the X-axis translation slide 302 and the Y-axis translation slide 304 via quick-change interfaces, making lens replacement convenient and taking less than 2 minutes.

[0033] During operation, the infrared lens is fixed to the fixture and the pressure sensor cable is connected. System startup: Input the lens model via HMI to retrieve the preset zoom cam curve and adjustment parameter thresholds. Coarse optical axis adjustment: The laser ranging array emits a 635nm wavelength visible laser, projecting it onto the front and rear surfaces of the lens, calculating the initial deviation between the optical axis and the mechanical axis. The PLC controls the pitch adjustment bracket 207 to adjust in 5 arcsecond steps until the optical axis offset is less than 50μm (coarse adjustment stage). Real-time detection and fine adjustment: The infrared target emits a 10.6μm wavelength signal, the CCD imaging unit acquires the image, and the calculation unit automatically identifies the resolution plate line pairs and calculates the image point center coordinates. When the image point offset is greater than 10μm, the PLC drives the adjustment bracket in the sequence of "angle correction → displacement compensation," triggering a detection every 5μm adjustment until the offset is less than 5μm. Simultaneously, the laser ranging array monitors the lens spacing in real time, and automatically corrects the position of the Z-axis translation slide 306 when temperature changes cause a lens spacing deviation greater than 10μm. Zoom performance verification: The control module controls the Z-axis drive motor 305 to drive the Z-axis translation slide 306 to move according to the preset zoom curve, covering the entire focal length (e.g., 10mm-100mm), and the CCD imaging unit collects imaging data of each focal length point in real time.

[0034] In some implementations, the base of the optical isolation platform adopts a multi-station layout, equipped with multiple independent mechanical adjustment modules and detection modules to support the simultaneous assembly and adjustment of multiple lens models. For example, the base of the optical isolation platform adopts a four-station layout, equipped with four independent mechanical adjustment modules and detection modules, which can support the simultaneous assembly and adjustment of up to four different lens models.

[0035] In some embodiments, the mounting and adjustment system for an infrared continuous zoom lens of this utility model further includes a visual guidance auxiliary module, which includes an industrial camera. The industrial camera is used to photograph the appearance of the lens, and the lens mounting marks are automatically located through image recognition to avoid manual alignment errors.

[0036] This invention utilizes a multi-dimensional adjustment mechanism in conjunction with a laser ranging array to achieve high-precision assembly and adjustment, with an optical axis offset ≤10μm and a focal length positioning accuracy ≤5μm, which is 3 times more accurate than traditional manual assembly and adjustment. A detection module and a control module enable real-time detection of optical axis offset and image point offset, forming a feedback closed-loop control that reduces the assembly and adjustment time to 40 minutes per cycle and supports 24-hour mass production. The flexible clamping fixture is compatible with lenses of φ30-φ150mm diameter, and temperature compensation is achieved through a temperature detection unit and control module, ensuring stable operation of the infrared continuous zoom lens in environments ranging from -20℃ to 60℃, exhibiting high compatibility and reliability. The human-machine interface automatically records assembly and adjustment process data, which is traceable and facilitates quality control and process optimization.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more (two or more) executable instructions for implementing a particular logical function or process. Furthermore, the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functionality involved.

[0040] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus or device (such as a computer-based system, a processor-included system or other system that can fetch and execute instructions from, an instruction execution system, apparatus or device).

[0041] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. All or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware, the program being stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiments.

[0042] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. This storage medium can be a read-only memory, a disk, or an optical disk, etc.

[0043] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An alignment system for an infrared continuous zoom lens, characterized by, The system includes a mechanical adjustment module, a detection module, and a control module. The mechanical adjustment module includes an adjustment table and an adjustment frame. The adjustment table is used to adjust the pitch and deflection angles of the lens's optical axis, and the adjustment frame is used to support the lens fixture, enabling horizontal position adjustment and continuous zoom of the lens. The detection module is used to monitor the lens spacing and optical axis offset in real time, and also to calculate the image point offset in real time. The control module is used to perform optical axis calibration and focal length calibration through the adjustment table and the adjustment frame based on the detection results of the detection module.

2. The alignment system for an infrared continuous zoom lens of claim 1, wherein, The detection module is also used to monitor the lens temperature in real time, and the control module is also used to correct the effect of temperature changes on the lens spacing through the adjustment frame based on the detection results of the detection module.

3. The alignment system for an infrared continuous zoom lens of claim 2, wherein, The adjustment platform includes a first support plate, a second support plate, an X-axis adjustment bracket, and a pitch adjustment bracket; the X-axis adjustment bracket enables the second support plate to move relative to the first support plate along the X-axis, and the pitch adjustment bracket enables the second support plate to change its pitch angle relative to the first support plate; the control module adjusts the pitch and deflection angles of the lens's optical axis through the X-axis adjustment bracket and the pitch adjustment bracket.

4. The alignment system for an infrared continuous zoom lens of claim 3, wherein The adjustment frame includes an X-axis drive motor, an X-axis translational slide, a Y-axis drive motor, a Y-axis translational slide, a Z-axis drive motor, and a Z-axis translational slide; during operation, the adjustment frame is mounted on the second support plate; The X-axis drive motor is used to drive the X-axis translation slide to move along the X-axis under the action of the control module; the Y-axis drive motor is used to drive the Y-axis translation slide to move along the Y-axis under the action of the control module; the Z-axis drive motor is used to drive the Z-axis translation slide to move along the Z-axis under the action of the control module; the control module realizes the horizontal position adjustment of the lens through the X-axis drive motor and the Y-axis drive motor, and controls the axial displacement of the focusing group through the Z-axis drive motor, so as to realize continuous zoom in conjunction with the zoom cam curve.

5. The alignment system for an infrared continuous zoom lens of claim 4, wherein, The detection module includes a laser ranging array; the laser ranging array includes multiple sets of laser rangefinders, which are respectively arranged on the object side and image side of the lens, for real-time monitoring of lens spacing and optical axis offset.

6. The alignment system for an infrared continuous zoom lens of claim 5, wherein, The detection module further includes an image point offset detection unit; the image point offset detection unit includes an infrared target, a CCD imaging unit, and a calculation unit; the infrared target is used to project infrared images, the CCD imaging unit is used to acquire imaging images, and the calculation unit is used to calculate image point offsets.

7. The alignment system for an infrared continuous zoom lens of claim 6, wherein, The detection module also includes a temperature compensation unit; the temperature compensation unit includes a thermocouple sensor, which is used to detect the lens temperature.

8. The alignment system for an infrared continuous zoom lens of claim 7, wherein, When the optical axis offset fed back by the laser ranging array is greater than a first preset value, the control module first drives the pitch adjustment bracket to correct the tilt angle, and then compensates for the displacement through the X-axis drive motor and the Y-axis drive motor until the optical axis offset is within a reasonable range.

9. The alignment system for an infrared continuous zoom lens of claim 7, wherein, When the image point offset detected by the image point offset detection unit is greater than a second preset value, the control module controls the Z-axis drive motor to drive the Z-axis translation carriage to move along a preset zoom curve until the image point offset is within a reasonable range.

10. The alignment system for an infrared continuous zoom lens of claim 7, wherein, When the lens spacing deviation caused by the temperature change fed back by the laser ranging array exceeds a third preset value, the control module calculates the temperature compensation correction value based on the lens spacing deviation and the lens temperature detected by the temperature compensation unit, and controls the Z-axis drive motor to drive the Z-axis translation carriage to move, adjusting the lens spacing until the lens spacing deviation caused by the temperature change is within a reasonable range.

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