Stable optical image measuring instrument

Abstract

The application discloses a stable optical image measuring instrument, belonging to the technical field of laser measuring instruments, which comprises a support table, an optical measuring instrument fixedly connected to the support table, a two-dimensional motion module fixedly connected to the support table, a moving table fixedly connected to the moving end of the two-dimensional motion module, the two-dimensional motion module being used for driving the moving table to move horizontally, a support frame slidingly connected to the moving table, a storage plate detachably connected to the support frame, a first elastic member arranged between the moving table and the support frame, and a locking assembly arranged in the moving table and used for locking the support frame. When a workpiece is placed on the storage plate, the support frame can slide downward along the moving table, and when the storage plate is impacted by the workpiece, the first elastic member is used for absorbing the impact force of the workpiece on the storage plate, so that the probability of the storage plate being broken is reduced.

Description

Technical Field

[0001] This invention relates to the field of laser measuring instrument technology, and in particular to a stable optical image measuring instrument. Background Technology

[0002] Optical image measuring instruments (OIMAs) are high-precision non-contact measuring devices based on optical imaging principles, integrating precision mechanics, automatic control, and image processing technologies. They are widely used in electronics manufacturing, precision mold making, semiconductors, PCBs, and medical devices. An OIMA mainly consists of a high-resolution camera, a telecentric lens, a high-precision XYZ motion platform, a multi-angle illumination system (such as ring light or coaxial light), and measurement software. By acquiring workpiece images and utilizing algorithms such as edge detection and contour fitting, OIMAs accurately measure parameters such as dimensions, angles, hole spacing, and geometric tolerances. They offer advantages such as high measurement accuracy, good repeatability, high efficiency, and non-destructive operation, making them particularly suitable for inspecting small, complex, or fragile parts. Thanks to their stable mechanical structure and advanced environmental compensation algorithms, the instrument maintains excellent measurement stability even under vibration and temperature variations, ensuring data reliability. It is a core inspection equipment in modern industrial quality control and reverse engineering.

[0003] During the measurement process, the workpiece to be measured must be placed stably on the transparent plate of the instrument's worktable. High-precision optical image measuring instruments generally use quartz glass as the plate material because it has excellent light transmittance, low coefficient of thermal expansion and ultra-smooth surface, which helps to improve image clarity and measurement stability. However, when placing the workpiece, if some workpiece surfaces are covered with grease or the placement speed is too fast, the workpiece is very likely to fall off, which will then impact the plate. Frequent impacts can cause cracks or even breakage of the plate, which will greatly increase maintenance costs and downtime risks. Summary of the Invention

[0004] In order to overcome the shortcomings mentioned in the background art, the present invention provides a stable optical image measuring instrument.

[0005] The technical solution is as follows: A stable optical image measuring instrument includes a support platform, an optical measuring instrument fixedly connected to the support platform, a two-dimensional motion module fixedly connected to the support platform, a moving stage fixedly connected to the moving end of the two-dimensional motion module, the two-dimensional motion module being used to drive the moving stage to move horizontally, a support frame slidably connected inside the moving stage, a shelf detachably connected to the support frame, a first elastic element being provided between the moving stage and the support frame, and a locking component for locking the support frame being provided inside the moving stage.

[0006] As an improvement to the above solution, the locking component includes symmetrically distributed rotating shafts, each of which is rotatably connected to the moving platform. Each rotating shaft is fixedly connected to symmetrically distributed drive blocks, which are used to press and lock the support frame. The moving platform is provided with a drive module for driving the symmetrically distributed rotating shafts to rotate synchronously.

[0007] As an improvement to the above scheme, the outer contour of the drive block is composed of an arc-shaped surface and a curved surface. The distance from the arc-shaped surface of the drive block to the central axis of the adjacent rotation shaft is always the same, and the distance from the curved surface of the drive block to the central axis of the adjacent rotation shaft gradually increases from the end away from the arc-shaped surface to the other end.

[0008] As an improvement to the above solution, the support frame is rotatably connected to a rotating shaft, the rotating shaft is located inside the moving platform, a second elastic element is provided between the support frame and the rotating shaft, the rotating shaft is fixedly connected to and wound with a cloth-like airbag, and a pulling component for pulling the cloth-like airbag is provided on the support frame.

[0009] As an improvement to the above solution, the pulling component includes a fixing frame, which is fixedly connected to the support frame. The fixing frame is rotatably connected to symmetrically distributed take-up shafts. Connecting tubes are fixedly connected to both sides of the fabric airbag, and the connecting tubes are fixedly connected to the corresponding take-up shafts.

[0010] As an improvement to the above solution, the support frame is fixedly connected with symmetrically distributed limiting tracks, and the connecting pipe is located within the corresponding limiting track.

[0011] As an improvement to the above solution, the support frame is fixedly connected to an air storage cylinder, a piston shaft is slidably connected inside the air storage cylinder, the air storage cylinder is fixedly connected to a connecting pipe, the connecting pipe is rotatably connected to the winding shaft, a hollow cavity is provided inside the winding shaft, the hollow cavity inside the winding shaft is connected to the connecting pipe, the connecting pipe is connected to the cloth-like airbag, and the hollow cavity inside the winding shaft is connected to the air storage cylinder through the connecting pipe.

[0012] As an improvement to the above solution, the symmetrically distributed take-up shafts are rotatably connected by a spline shaft, the spline shaft is splined with symmetrically distributed sliding sleeves, the fixing frame is provided with a rotation module for driving the spline shaft to rotate, the sliding sleeve is fixedly connected with a locking rod, the take-up shaft is provided with a sliding groove, and the locking rod slides in the corresponding sliding groove.

[0013] As an improvement to the above solution, the piston shaft is fixedly connected to a connecting member, and the connecting member is rotatably connected to the adjacent sliding sleeve.

[0014] As an improvement to the above solution, a third elastic element is provided between the winding shaft and the adjacent sliding sleeve, and the elastic coefficient of the third elastic element is greater than that of the second elastic element.

[0015] Compared with the prior art, the technical effects achieved by the present invention are as follows: 1. When placing a workpiece on the shelf, the present invention allows the support frame to slide downward along the moving table. When the shelf is subjected to the impact force of the workpiece, the first elastic element absorbs the impact force of the workpiece on the shelf, thereby reducing the probability of the shelf breaking.

[0016] 2. By placing the workpiece onto the shelf, the fabric airbag is attached to the lower side of the shelf. The expansion of the fabric airbag provides uniform and flexible support to the lower side of the shelf, thereby dispersing the impact force of the workpiece on the shelf and further reducing the probability of the shelf breaking.

[0017] 3. By using connecting pipes to limit the movement of the fabric airbag and its own expansion, the fabric airbag and the support frame are in a completely sealed state, ensuring that the shelf cannot enter the moving platform after it breaks, but falls onto the fabric airbag, thus improving the shelf replacement rate.

[0018] 4. By first positioning the fabric airbag under the shelf, and then pushing the gas in the air reservoir into the fabric airbag with the piston shaft, the fabric airbag naturally expands and fits against the underside of the shelf, improving the uniformity of the fabric airbag's expansion and achieving stable support for the shelf by the fabric airbag. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the mobile platform of the present invention; Figure 3 This is a three-dimensional structural diagram of the support frame of the present invention; Figure 4 This is a three-dimensional structural diagram of the rotating shaft and driving block of the present invention; Figure 5 This is a three-dimensional structural diagram of the fabric-like airbag of the present invention; Figure 6 This is a three-dimensional structural diagram of the winding shaft of the present invention; Figure 7 This is a three-dimensional structural diagram of the gas storage cylinder of the present invention; Figure 8 This is a three-dimensional cross-sectional view of the locking rod of the present invention.

[0020] The following are the labels in the diagram: 1. Support platform, 2. Optical measuring instrument, 3. Two-dimensional motion module, 4. Moving stage, 5. Support frame, 6. Placement plate, 7. First elastic element, 201. Rotating shaft, 202. Drive block, 203. Drive module, 301. Rotating shaft, 302. Second elastic element, 303. Cloth-like airbag, 401. Fixing frame, 402. Rewinding shaft, 403. Connecting pipe, 404. Limiting track, 501. Air tank, 502. Piston shaft, 503. Connecting pipe, 601. Spline shaft, 602. Sliding sleeve, 603. Rotating module, 604. Locking rod, 605. Slide groove, 606. Connector, 607. Third elastic element. Detailed Implementation

[0021] The above solution will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrating this application and are not intended to limit the scope of this application. The implementation conditions used in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually the conditions in routine experiments.

[0022] High-precision optical image measuring instruments use quartz glass as the mounting plate. Due to its excellent light transmittance, low coefficient of thermal expansion and ultra-smooth surface, it significantly improves the clarity of imaging and measurement stability. However, if the workpiece surface is covered with grease or is placed improperly, it is easy to fall off and cause impact. Frequent impacts can easily cause the quartz glass to crack or even break, greatly increasing maintenance costs and downtime risks.

[0023] Example 1 This embodiment provides a stable optical image measuring instrument for accurately detecting the dimensions and geometric parameters of a workpiece.

[0024] like Figures 1-3 As shown, the device includes a support platform 1, an optical measuring instrument 2 fixedly connected to the support platform 1, a two-dimensional motion module 3 fixedly connected to the upper side of the support platform 1, a moving stage 4 fixedly connected to the moving end of the two-dimensional motion module 3, the two-dimensional motion module 3 being used to drive the moving stage 4 to move back and forth and left and right to realize multi-area automatic measurement of the workpiece, a light-receiving sensor module is set at the bottom inside the moving stage 4, a support frame 5 is vertically slidably connected inside the moving stage 4, and a shelf 6 is detachably connected to the upper side of the support frame 5. The shelf 6 is made of quartz glass in the prior art, which is used to make the image of the measurement area clearer and facilitate accurate capture of the outline and details of the target object. A first elastic element 7 is set between the moving stage 4 and the support frame 5. The first elastic element 7 is a spring, which can provide cushioning when the workpiece is placed too quickly or falls, effectively absorbing the impact energy of the workpiece on the shelf 6, protecting the quartz glass shelf 6 from damage, and reducing the probability of the shelf 6 breaking. A locking component for locking the support frame 5 is set inside the moving stage 4.

[0025] like Figures 2-4 As shown, the locking assembly includes two symmetrically distributed rotating shafts 201, both rotatably connected to the moving platform 4. Each rotating shaft 201 is fixedly connected to symmetrically distributed driving blocks 202. The outer contour of each driving block 202 is composed of an arc-shaped surface and a curved surface. The distance from the arc-shaped surface of the driving block 202 to the central axis of the adjacent rotating shaft 201 is always the same. The distance from the curved surface of the driving block 202 to the central axis of the adjacent rotating shaft 201 gradually increases from the end furthest from the arc-shaped surface to the other end. The driving blocks 202 are used to press and lock the support frame 5. When the driving blocks 202 separate from the support frame 5, the support frame 5 can slide freely along the moving platform 4. Initially, the driving blocks 202 and the support frame 5 are separated. Figure 3 The state shown is that the drive block 202 and the support frame 5 are in a supported state. The moving stage 4 is equipped with a drive module 203 for driving the synchronous rotation of two symmetrically distributed rotating shafts 201. The drive module 203 consists of a servo motor, two sprockets and a chain. The output shaft of the servo motor is fixedly connected to either rotating shaft 201. The two sprockets are fixedly connected to the same side of the two rotating shafts 201 respectively, and the chain is wrapped around the outside of the two sprockets. The rotating shaft 201 drives the drive block 202 to rotate. The support frame 5 can be fixed when measuring the workpiece to ensure the stability of the workpiece and improve the measurement accuracy. It can be unlocked in the buffer state to allow the support frame 5 to sink and buffer appropriately, taking into account both stability and safety.

[0026] Working principle: When optical image measurement of a workpiece is required, the operator places the workpiece on the placement plate 6. When the workpiece impacts the placement plate 6, the impact force is transmitted to the support frame 5. The support frame 5 moves downward along the moving table 4 under the force. At the same time, the four first elastic elements 7 compress and absorb the impact force of the workpiece on the placement plate 6, reducing the probability of the placement plate 6 breaking. After the workpiece is completely placed on the placement plate 6, the drive module 203 is activated. The drive module 203 drives the two symmetrically distributed rotating shafts 201 to rotate. 01 drives the drive block 202 on it to rotate to the upper side, so that the drive block 202 squeezes and locks the support frame 5, ensuring that the height of the placement plate 6 relative to the optical measuring instrument 2 will not change. Then, the operator turns on the optical measuring instrument 2 and the two-dimensional motion module 3, so that the optical measuring instrument 2 starts to measure various parameters of the workpiece. At the same time, the two-dimensional motion module 3 drives the moving stage 4 to move horizontally. The moving stage 4 drives the workpiece on it to move back and forth and left and right through the support frame 5 and the placement plate 6, so that the optical measuring instrument 2 can measure all the parameters of the workpiece. This continues until the workpiece measurement is completed.

[0027] After the workpiece measurement is completed, the operator turns on the drive module 203 again to reset the two symmetrically distributed rotating shafts 201. The rotating shafts 201 drive the two symmetrically distributed drive blocks 202 on them to rotate synchronously. After the rotating shafts 201 drive the two drive blocks 202 to the lower side, the operator turns off the drive module 203. At this time, the drive blocks 202 no longer squeeze and lock the support frame 5, and the support frame 5 can slide freely along the moving table 4. Then the operator removes the workpiece from the placement plate 6. When the workpiece needs to be measured again, the above steps are repeated.

[0028] Example 2 This embodiment provides a stable optical image measuring instrument, which is a further improvement on Embodiment 1.

[0029] When the workpiece impacts the shelf 6, the shelf 6 absorbs shock through the support frame 5 and the first elastic element 7. However, when the impact force of the workpiece on the shelf 6 is large, the instantaneous impact force of the workpiece on the shelf 6 increases. At this time, the first elastic element 7 cannot disperse the impact force on the shelf 6 in time, which leads to damage to the shelf 6.

[0030] like Figure 5 and Figure 6 As shown, a rotating shaft 301 is rotatably connected to the rear side of the support frame 5. The rotating shaft 301 is located inside the moving platform 4. A second elastic element 302, which is a torsion spring, is provided between the support frame 5 and the rotating shaft 301. The second elastic element 302 is used to drive the rotating shaft 301 to return to its original rotation. The rotating shaft 301 is fixedly connected to and wound with a cloth-like airbag 303. A pulling assembly for pulling the cloth-like airbag 303 is provided on the support frame 5. The pulling assembly includes a fixing frame 401, which is fixedly connected to the front side of the support frame 5. Two winding shafts 402, symmetrically distributed on the left and right sides, are rotatably connected to the fixing frame 401. The cloth-like airbag 303 is located on both sides of the fixing frame 5. Each component is fixedly connected with a connecting tube 403, which is fixedly connected to a corresponding take-up shaft 402. The two take-up shafts 402 rotate synchronously to take up the corresponding connecting tubes 403. The connecting tubes 403 are made of glass fiber reinforced plastic, which has high strength and is not easily deformed or broken, thereby enabling the release of the fabric airbag 303. The support frame 5 is fixedly connected with two symmetrically distributed limiting rails 404. The connecting tube 403 slides within the corresponding limiting rail 404. The limiting rails 404 prevent misalignment when the take-up shaft 402 takes up the connecting tube 403, ensuring that the fabric airbag 303 is directly below the shelf 6.

[0031] like Figure 6 and Figure 7As shown, the support frame 5 is fixedly connected to two symmetrically distributed air storage cylinders 501. A piston shaft 502 is slidably connected inside the air storage cylinder 501. A connecting pipe 503 is fixedly connected to the air storage cylinder 501. The connecting pipe 503 is rotatably connected to the winding shaft 402. A hollow cavity is provided inside the winding shaft 402. The hollow cavity inside the winding shaft 402 is connected to the connecting pipe 403. The connecting pipe 403 is connected to the cloth-shaped airbag 303. The hollow cavity inside the winding shaft 402 is connected to the air storage cylinder 501 through the connecting pipe 503. The piston shaft 502 slides along the adjacent air storage cylinder 501, which can push the gas inside the air storage cylinder 501 into the cloth-shaped airbag 303 along the connecting pipe 503, the hollow cavity inside the winding shaft 402 and the connecting pipe 403. The cloth-shaped airbag 303 expands and partially passes through the support frame 5 and fits against the shelf 6.

[0032] like Figures 6-8 As shown, two symmetrically distributed take-up shafts 402 are rotatably connected by a splined shaft 601. The splined shaft 601 is splinedly connected to two symmetrically distributed sliding sleeves 602. Initially, both sliding sleeves 602 are located at the center of the splined shaft 601. The fixed frame 401 is equipped with a rotation module 603 for driving the splined shaft 601 to rotate. The rotation module 603 consists of a servo motor and two gears. The output shaft of the servo motor and the splined shaft 601 are fixedly connected to the two gears respectively. The two gears mesh to achieve free rotation of the splined shaft 601. A locking rod 604 is fixedly connected to each sliding sleeve 602. A groove 605 is provided on the outside of the take-up shaft 402. The groove 605 is an inclined groove, and the locking rod 604 slides within the corresponding groove 605. A connector 606 is fixedly connected to the piston shaft 502. The connector 606 is rotatably connected to the adjacent sliding sleeve 602, which is used to synchronously push the corresponding piston shaft 502 to slide along the adjacent air reservoir 501 when the sliding sleeve 602 slides along the spline shaft 601. A third elastic element 607 is provided between the winding shaft 402 and the adjacent sliding sleeve 602. The third elastic element 607 is a spring, which is used to apply force to the sliding sleeve 602. The elastic coefficient of the third elastic element 607 is greater than the elastic coefficient of the second elastic element 302. It is used to make the spline shaft 601 first drive the two winding shafts 402 to rotate. After the cloth-shaped airbag 303 is completely released, the spline shaft 601 rotates around the winding shaft 402, thereby driving the two sliding sleeves 602 to slide along the spline shaft 601.

[0033] Working principle: When the worker places the workpiece, the rotating module 603 is turned on. The rotating module 603 drives the two take-up shafts 402 to rotate through the spline shaft 601. The take-up shafts 402 rotate and take up the corresponding connecting tubes 403 respectively. The connecting tubes 403 pull the cloth-like airbags 303 to move synchronously. The cloth-like airbags 303 pull the rotating shaft 301 to rotate. At the same time, the two symmetrically distributed second elastic elements 302 twist. At this moment, the two connecting tubes 403 move along the corresponding limit track 404. This continues until the two connecting tubes 403 are completely below the placement plate 6. At this moment, the rotating shaft 301 completely releases the cloth-like airbags 303 wrapped around it. That is, the take-up shaft 402 pulls the connecting tubes 403 to the limit state.

[0034] When the take-up shaft 402 pulls the connecting tube 403 to its limit, the rotating module 603 continues to drive the two take-up shafts 402 to rotate via the spline shaft 601. At this time, because the two connecting tubes 403 are at their limit, the take-up shafts 402 are unable to continue rotating due to resistance. The spline shaft 601 rotates along the two symmetrically distributed take-up shafts 402. The spline shaft 601 drives the sliding sleeve 602 on it to rotate synchronously, causing the sliding sleeve 602 to drive the locking rod 604 on it to rotate synchronously. The locking rod 604 rotates and slides along the slide groove 605 on the adjacent take-up shaft 402, causing the locking rod 604 to drive the adjacent sliding sleeve 602 to slide along the spline shaft 601. At the same time, the third elastic element 607 is compressed, and the sliding sleeve 602 drives the adjacent piston shaft 502 to move synchronously through the connecting member 606, causing the piston shaft 502 to move along the adjacent storage groove 601. As the air cylinder 501 slides, the piston shaft 502 pushes the gas inside the air cylinder 501. The gas inside the air cylinder 501 enters the cloth-shaped airbag 303 through the connecting pipe 503, the hollow structure inside the winding shaft 402, and the connecting pipe 403. This continues until the locking rod 604 slides to its limit along the corresponding slide groove 605. Then, the rotating module 603 is closed, and the cloth-shaped airbag 303 begins to expand under the gas and comes into contact with the lower side of the shelf 6 to form a support. In this way, when the shelf 6 is impacted by an object, the impact force can be effectively dispersed under the support of the cloth-shaped airbag 303, further reducing the probability of the shelf 6 breaking. When the shelf 6 breaks due to the impact of an object, the fragments of the shelf 6 will fall onto the cloth-shaped airbag 303, preventing the fragments of the shelf 6 from entering the moving table 4, thus improving the replacement rate of the shelf 6.

[0035] After the workpiece is placed, the operator restarts the rotation module 603. The rotation module 603 drives the spline shaft 601 to reset and rotate. At this time, the spline shaft 601 drives the two sliding sleeves 602 on it to reset synchronously. The sliding sleeves 602 drive the locking rod 604 to reset along the slide groove 605. At the same time, the third elastic element 607 extends and resets, so that the sliding sleeves 602 drive the corresponding piston shaft 502 to reset synchronously through the connecting piece 606. The piston shaft 502 slides along the adjacent air storage cylinder 501 to reset, drawing the gas in the cloth-shaped air bag 303 back to the air storage. Inside the cylinder 501, this continues until the sliding sleeve 602 returns to its initial state along the spline shaft 601. Then, the rotating module 603 drives the corresponding take-up shaft 402 to return to its initial state via the spline shaft 601, the sliding sleeve 602, and the locking rod 604, causing the take-up shaft 402 to release the connecting tube 403 wound around it. At the same time, the second elastic element 302 drives the rotating shaft 301 to wind up the cloth-like airbag 303. This continues until the cloth-like airbag 303 returns to its initial state, and then the measurement of the workpiece begins. When the workpiece needs to be inspected again, the above steps are repeated.

[0036] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A stable optical image measuring instrument, comprising a support platform (1), wherein an optical measuring instrument (2) is fixedly connected to the support platform (1), a two-dimensional motion module (3) is fixedly connected to the support platform (1), and a moving stage (4) is fixedly connected to the moving end of the two-dimensional motion module (3), wherein the two-dimensional motion module (3) is used to drive the moving stage (4) to move horizontally, characterized in that, The mobile platform (4) is slidably connected to a support frame (5), and the support frame (5) is detachably connected to a shelf (6). A first elastic element (7) is provided between the mobile platform (4) and the support frame (5), and a locking component for locking the support frame (5) is provided inside the mobile platform (4). The support frame (5) is rotatably connected to a rotating shaft (301), the rotating shaft (301) is located inside the moving platform (4), a second elastic element (302) is provided between the support frame (5) and the rotating shaft (301), the rotating shaft (301) is fixedly connected to and wound with a cloth-like airbag (303), and a pulling component for pulling the cloth-like airbag (303) is provided on the support frame (5); The pulling assembly includes a fixing frame (401), which is fixedly connected to the support frame (5). The fixing frame (401) is rotatably connected to symmetrically distributed take-up shafts (402). Both sides of the fabric airbag (303) are fixedly connected to connecting tubes (403), and the connecting tubes (403) are fixedly connected to the corresponding take-up shafts (402). The support frame (5) is fixedly connected to an air storage cylinder (501), and a piston shaft (502) is slidably connected inside the air storage cylinder (501). The air storage cylinder (501) is fixedly connected to a connecting pipe (503), and the connecting pipe (503) is rotatably connected to the winding shaft (402). A hollow cavity is provided inside the winding shaft (402), and the hollow cavity inside the winding shaft (402) is connected to the connecting pipe (403). The connecting pipe (403) is connected to the cloth-like airbag (303), and the hollow cavity inside the winding shaft (402) is connected to the air storage cylinder (501) through the connecting pipe (503). The symmetrically distributed take-up shafts (402) are rotatably connected by a spline shaft (601). The spline shaft (601) is splinedly connected to symmetrically distributed sliding sleeves (602). The fixed frame (401) is provided with a rotating module (603) for driving the spline shaft (601) to rotate. The sliding sleeves (602) are fixedly connected to a locking rod (604). The take-up shaft (402) is provided with a sliding groove (605). The locking rod (604) slides within the corresponding sliding groove (605). The piston shaft (502) is fixedly connected to a connector (606), and the connector (606) is rotatably connected to the adjacent sliding sleeve (602). A third elastic element (607) is provided between the take-up shaft (402) and the adjacent sliding sleeve (602), and the elastic coefficient of the third elastic element (607) is greater than the elastic coefficient of the second elastic element (302).

2. The stable optical image measuring instrument according to claim 1, characterized in that, The locking assembly includes symmetrically distributed rotating shafts (201), each of which is rotatably connected to the moving platform (4). Each rotating shaft (201) is fixedly connected to a symmetrically distributed drive block (202), which is used to press and lock the support frame (5). The moving platform (4) is provided with a drive module (203) for driving the symmetrically distributed rotating shafts (201) to rotate synchronously.

3. A stable optical image measuring instrument according to claim 2, characterized in that, The outer contour of the drive block (202) is composed of an arc surface and a curved surface. The distance from the arc surface of the drive block (202) to the central axis of the adjacent rotating shaft (201) is always the same. The distance from the curved surface of the drive block (202) to the central axis of the adjacent rotating shaft (201) gradually increases from one end away from the arc surface to the other end.

4. A stable optical image measuring instrument according to claim 1, characterized in that, The support frame (5) is fixedly connected to symmetrically distributed limiting tracks (404), and the connecting pipe (403) is located within the corresponding limiting track (404).

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