Objective lens switching device and measuring equipment

Abstract

The utility model relates to the technical field of optical instruments, in particular to an objective lens switching device and measuring equipment. The objective lens switching device comprises a fixed assembly and a moving assembly, the moving assembly comprises an objective lens mounting plate, a first mounting block, a second mounting block, a moving rod and a supporting plate, and the first mounting block, the second mounting block and the objective lens mounting plate are all mounted on the supporting plate; the first mounting block and the second mounting block are arranged at intervals along a first direction, the moving rod and the objective lens mounting plate are arranged at intervals along a second direction, and the first mounting block, the objective lens mounting plate, the second mounting block and the moving rod are fixedly connected in sequence; a light incident area is arranged on the fixing assembly, a plurality of objective lens mounting areas are arranged on the objective lens mounting plate in the first direction, the light incident area and the objective lens mounting areas are sequentially arranged in the third direction, and the moving rod can reciprocate in the first direction so that the objective lens mounting areas can move to the light incident area. According to the utility model, the problem of deformation caused by uneven stress of the objective lens switching device is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of optical instrument technology, and in particular relates to an objective lens switching device and a measuring device. Background Technology

[0002] The objective lens switcher plays a crucial role in the measuring equipment, and its quality directly affects the imaging accuracy of the LED chip being tested.

[0003] Existing objective lens switchers lack a reliable force-bearing surface at the bottom, making them prone to deformation due to uneven force distribution. This not only reduces accuracy but also poses a risk of deformation during assembly or disassembly due to uneven force distribution. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in the prior art, the bottom of the objective lens switcher lacks a reliable force-bearing surface, which easily causes deformation due to uneven force. This utility model provides an objective lens switching device and a measuring device.

[0005] To solve the above-mentioned technical problems, on the one hand, this utility model provides an objective lens switching device, including a fixed component and a moving component. The moving component includes an objective lens mounting plate, a first mounting block, a second mounting block, a moving rod, and a support plate. The first mounting block, the second mounting block, and the objective lens mounting plate are all mounted on the support plate.

[0006] The first mounting block and the second mounting block are arranged at intervals along a first direction, and the moving rod and the objective lens mounting plate are arranged at intervals along a second direction. The first mounting block, the objective lens mounting plate, the second mounting block and the moving rod are fixed in sequence, and the first mounting block and the moving rod are fixedly connected.

[0007] The fixing component has a light-incident area, and the objective lens mounting plate has multiple objective lens mounting areas along the first direction. The light-incident area and the objective lens mounting areas are arranged sequentially along the third direction. The moving rod can reciprocate along the first direction so that each objective lens mounting area can be moved to a position opposite to the light-incident area. The first direction, the second direction, and the third direction are perpendicular to each other.

[0008] Optionally, the fixing assembly includes an objective lens switching plate and a driving assembly, wherein the objective lens switching plate is provided with the light incident area;

[0009] The driving component is located on the objective lens switching plate and is used to drive the moving rod to reciprocate along the first direction.

[0010] Optionally, the driving component includes a coil, and the moving rod is a magnetic rod that passes through the coil. When the coil is energized, it generates a magnetic field. The magnetic rod is attracted or repelled by the magnetic field generated by the coil, so that the magnetic rod can move back and forth along the first direction.

[0011] Optionally, the fixing component further includes a connecting seat, and the support plate is provided with a guide rail that extends along the first direction;

[0012] The guide rail is slidably connected to the connecting seat, and the connecting seat is fixedly connected to the objective lens switching plate.

[0013] Optionally, the connecting seat includes a detachably connected slider and a slider connecting plate, the guide rail is slidably connected to the slider, and the slider connecting plate is fixedly connected to the objective lens switching plate.

[0014] Optionally, the slider connecting plate is provided with a positioning part, the positioning part extends along the first direction, the positioning part and the slider connecting plate form a guide structure, the guide structure is used to increase the positional accuracy of the slider, and the slider is disposed in the guide structure.

[0015] Optionally, the objective lens switching device further includes an origin device, a reading head, and a grating ruler, wherein the grating ruler is disposed on the objective lens mounting plate and extends along the first direction;

[0016] The slider connecting plate is provided with a receiving groove, the receiving groove has an opening on the side opposite to the slider, and the origin device and the reading head are located in the receiving groove.

[0017] Optionally, the objective lens switching device further includes a limiting sensor and a photoelectric sensor. The limiting sensor is provided on both the first mounting block and the second mounting block, and the photoelectric sensor is provided in the receiving groove.

[0018] Optionally, the objective lens switching device further includes a hard limiting block, which is provided on both the first mounting block and the second mounting block. The hard limiting block is used to reduce the collision between the first mounting block and the second mounting block and the slider connecting plate.

[0019] According to the objective lens switching device of this embodiment, the operation of the objective lens switching device mainly involves the movement of the moving component. When it is necessary to switch objectives, the moving rod will reciprocate along a first direction (e.g., the horizontal direction). Since the first mounting block, the objective lens mounting plate, and the second mounting block are fixedly connected end to end in sequence and are all mounted on the support plate, the movement of the moving rod will move the objective lens mounting plate together. The objective lens mounting plate is provided with multiple objective lens mounting areas along the first direction, and each area is equipped with an objective lens. As the objective lens mounting plate moves, different objective lens mounting areas will move sequentially to below the light-receiving area of ​​the fixed component, thereby realizing the switching of different objectives. In this process, the objective lens switching device can ensure that each objective lens can move accurately to the light-receiving area to achieve accurate observation or detection. By reciprocating the moving rod along the first direction, the objective lens switching device can accurately switch different objectives. Since the objective lens mounting areas on the objective lens mounting plate and the light-receiving area of ​​the fixed component are arranged sequentially along a third direction (e.g., the vertical direction), each objective lens can move accurately to below the light-receiving area, thereby ensuring the accuracy of observation or detection. Meanwhile, the support plate provides a reliable force-bearing surface for the moving components. Since the first mounting block, the second mounting block, and the objective lens mounting plate are all mounted on the support plate, and the first mounting block, the objective lens mounting plate, and the second mounting block are connected end to end to form a loop structure, they can jointly bear the force generated during the movement, thereby avoiding the deformation problem caused by uneven force distribution, so that the objective lens switching device can maintain high precision and stability during long-term use.

[0020] On the other hand, this utility model embodiment provides a measuring device, including multiple objective lenses and the above-mentioned objective lens switching device, wherein each objective lens is installed in each objective lens mounting area on the objective lens mounting plate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the objective lens switching device provided in an embodiment of the present invention from a first-view perspective;

[0022] Figure 2 This is a schematic diagram of the second perspective of the objective lens switching device provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the objective lens switching device provided in one embodiment of the present invention after removing part of its structure.

[0024] The reference numerals in the accompanying drawings are as follows:

[0025] 1. Objective lens mounting plate; 2. First mounting block; 3. Second mounting block; 4. Moving rod; 5. Support plate; 6. Light-receiving area; 7. Objective lens mounting area; 8. Objective lens switching plate; 9. Coil; 10. Guide rail; 11. Slider; 12. Slider connecting plate; 13. Positioning part; 15. Reading head; 16. Grating ruler; 17. Receiving groove; 18. Limiting sensor; 19. Photoelectric sensor; 20. Hard limiting block. Detailed Implementation

[0026] To make the technical problems solved, technical solutions, and beneficial effects 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.

[0027] like Figures 1 to 3 As shown, an embodiment of the present invention provides an objective lens switching device, including a fixed component and a moving component. The moving component includes an objective lens mounting plate 1, a first mounting block 2, a second mounting block 3, a moving rod 4, and a support plate 5. The first mounting block 2, the second mounting block 3, and the objective lens mounting plate 1 are all mounted on the support plate 5.

[0028] The first mounting block 2 and the second mounting block 3 are arranged at intervals along the first direction, and the moving rod 4 and the objective lens mounting plate 1 are arranged at intervals along the second direction. The first mounting block 2, the objective lens mounting plate 1, the second mounting block 3 and the moving rod 4 are fixed in sequence, and the first mounting block 2 and the moving rod 4 are fixedly connected.

[0029] The fixed assembly has a light-receiving area 6, and the objective lens mounting plate 1 has multiple objective lens mounting areas 7 along a first direction. The light-receiving area 6 and the objective lens mounting areas 7 are arranged sequentially along a third direction. The moving rod 4 can reciprocate along the first direction so that each objective lens mounting area 7 can move to a position opposite to the light-receiving area 6. The first direction, the second direction, and the third direction are perpendicular to each other. In this embodiment, the position where each objective lens mounting area 7 can move to is opposite to the light-receiving area 6 means that it moves to directly below the light-receiving area 6. The first direction coincides with the X-axis direction, the second direction coincides with the Y-axis direction, and the third direction coincides with the Z-axis direction. By installing the first mounting block 2, the second mounting block 3, and the objective lens mounting plate 1 on the support plate 5, the structural stability of the objective lens switcher is increased, and the deformation problem caused by the lack of a force-bearing surface at the bottom is reduced. The reciprocating movement of the moving rod 4 along the first direction allows each objective lens mounting area 7 to move precisely to the light-receiving area 6, improving the accuracy and reliability of objective lens switching. The structural improvements make the objective lens switcher more durable for long-term use and high-frequency objective lens switching, reducing the need for maintenance and replacement. At the same time, due to the enhanced structural stability and the accuracy of objective lens switching, the imaging quality of the LED chip detected by the switcher is improved.

[0030] In one embodiment, the fixing component includes an objective lens switching plate 8 and a driving component, wherein the objective lens switching plate 8 is provided with a light incident area 6;

[0031] The drive assembly is mounted on the objective lens switching plate 8 and is used to drive the moving rod 4 to reciprocate along the first direction. In this embodiment, the fixing assembly integrates the objective lens switching plate 8 and the drive assembly. This integrated design simplifies the structure of the objective lens switching device, making the entire system more compact and easier to install and maintain. The drive assembly, mounted on the objective lens switching plate 8, directly drives the moving rod 4 to reciprocate along the first direction. This design provides precise objective lens switching, ensuring that each objective lens mounting area 7 can be accurately moved to the light-receiving area 6, improving the system's positioning accuracy and repeatability.

[0032] In one embodiment, the driving assembly includes a coil 9 and a moving rod 4, which is a magnetic rod inserted through the coil 9. When the coil 9 is energized, it generates a magnetic field. The magnetic rod is attracted or repelled by the magnetic field generated by the coil 9, allowing it to reciprocate along a first direction. In this embodiment, when it is necessary to switch objectives, the driving assembly starts working. The coil 9 in the driving assembly is energized, generating a magnetic field. Since the moving rod 4 is a magnetic rod, it is attracted or repelled by the magnetic field generated by the coil 9, thus reciprocating along the first direction (e.g., the X-axis direction). The movement of the magnetic rod (moving rod 4) moves the objective lens mounting plate 1 along with it, because the objective lens mounting plate 1 and the magnetic rod are fixedly connected. The objective lens mounting plate 1 has multiple objective lens mounting areas 7, each of which is equipped with an objective lens. As the objective lens mounting plate 1 moves, different objective lens mounting areas 7 will sequentially move to below the light-receiving area 6 on the objective lens switching plate 8. When the desired objective lens is moved below the light-receiving area 6, light enters the objective lens through the light-receiving area 6, enabling observation or inspection of the objective lens. After observation or inspection is completed, the drive assembly operates again, driving the magnetic rod (moving rod 4) to move in the opposite direction, moving the next desired objective lens below the light-receiving area 6. Through the interaction between the coil 9 and the magnetic rod in the drive assembly, this objective lens switching device can precisely control the direction and speed of the magnetic rod (moving rod 4), thereby achieving precise control of objective lens switching. This control method not only improves the accuracy of objective lens switching but also makes the switching process smoother and more reliable. Since the magnetic rod (moving rod 4) and the objective lens mounting plate 1 are fixedly connected and are jointly supported by the support plate 5, this objective lens switching device can maintain high stability and durability during long-term use. This design reduces deformation problems caused by uneven force and extends the service life of the equipment.

[0033] In one embodiment, the fixing component further includes a connecting seat, and a guide rail 10 is provided on the support plate 5, the guide rail 10 extending along a first direction;

[0034] The guide rail 10 is slidably connected to the connecting seat, which is fixedly connected to the objective lens switching plate 8. In this embodiment, the connecting seat is provided with a groove, and the guide rail 10 is slidably connected in the groove. The guide rail 10 extends along a first direction (e.g., the X-axis direction) and is slidably connected to the connecting seat, which is then firmly fixedly connected to the objective lens switching plate 8, forming a stable support structure. As the magnetic rod (moving rod 4) moves, the entire support plate 5 (carrying the guide rail 10, magnetic rod, objective lens mounting plate 1, and other components) also moves together. Because the guide rail 10 is slidably connected to the connecting seat, this movement is smooth and continuous. Different objective lens mounting areas 7 on the objective lens mounting plate 1 will move sequentially below the light-incident area 6 on the objective lens switching plate 8 as the support plate 5 moves. When the required objective lens moves below the light-incident area 6, light will enter the objective lens through the light-incident area 6, thereby realizing the observation or detection of the target object. After completing the observation or detection task, the drive assembly is powered on again, driving the magnetic rod (moving rod 4) to move by changing the direction of the magnetic field, moving the next required objective lens below the light-receiving area 6. Due to the sliding connection between the guide rail 10 and the connecting seat, the magnetic rod (moving rod 4) maintains a smooth and continuous movement during movement. This design reduces jamming and shaking during movement, improving the accuracy and stability of objective lens switching. The connecting seat is fixedly connected to the objective lens switching plate 8, providing a stable support point for the guide rail 10 and the magnetic rod (moving rod 4). This design avoids deformation problems caused by uneven force, enhancing the structural stability and durability of the entire objective lens switching device.

[0035] In one embodiment, the connector includes a detachably connected slider 11 and slider connecting plate 12. A guide rail 10 is slidably connected to the slider 11, and the slider connecting plate 12 is fixedly connected to the objective lens switching plate 8. In this embodiment, the split design of the connector allows the entire system to be divided into multiple modules, facilitating production, assembly, and debugging. It also facilitates subsequent maintenance and upgrades, and avoids the need to replace the entire connector due to system damage, thereby reducing costs.

[0036] In one embodiment, the slider connecting plate 12 is provided with a positioning part 13, which extends along a first direction. The positioning part 13 and the slider connecting plate 12 form a guide structure, which is used to increase the positional accuracy of the slider 11. The slider 11 is disposed in the guide structure. In this embodiment, the positioning part 13 is a vertical plate, and the guide structure is an L-shaped groove formed by the vertical plate and the slider connecting plate 12. The design of the L-shaped groove guide structure and the vertical plate positioning part 13 increases the accuracy of slider 11 installation and positioning, making slider 11 installation and disassembly more convenient. During installation, simply slide the slider 11 into the open end of the L-shaped groove, then adjust it to the predetermined position and lock it. Similarly, during disassembly, simply loosen the locking mechanism and slide the slider 11 out from the open end of the L-shaped groove. This design reduces the difficulty of installation and disassembly and improves work efficiency.

[0037] In one embodiment, the objective lens switching device further includes an origin device, a reading head 15 and a grating ruler 16, the grating ruler 16 being disposed on the objective lens mounting plate 1 and extending along a first direction;

[0038] The slider connecting plate 12 is provided with a receiving groove 17, which opens on the side opposite to the slider 11. The origin device and the reading head 15 are disposed in the receiving groove 17. In this embodiment, the grating ruler 16 is disposed on the objective lens mounting plate 1 and extends along the first direction (sliding direction). The grating ruler 16 is composed of a series of equally spaced parallel lines, which can be light-transmitting or light-blocking, forming a grating pattern. When the objective lens mounting plate 1 (carrying the grating ruler 16) slides, the relative position between the grating ruler 16 and the reading head 15 changes. The reading head 15 contains components such as a light source and a photodetector, which can capture the signal generated by the change in light intensity on the grating ruler 16. After processing, these signals can be converted into the displacement of the objective lens mounting plate 1 relative to the reading head 15, thereby achieving accurate displacement measurement. The origin device is a fixed reference point used to determine the starting position of the objective lens mounting plate 1. When the objective lens mounting plate 1 slides to a specific position (i.e., the origin position), the origin device will emit a signal. The reading head 15 captures the signal emitted by the origin and uses it as the starting point for displacement measurement. Thus, regardless of when or where the objective mount 1 slides, its displacement relative to the origin can be measured via the reading head 15. The combined use of the grating ruler 16 and the reading head 15 allows for precise measurement and recording of the displacement of the objective mount 1. This contributes to higher precision and accuracy when switching objectives. By connecting the grating ruler 16 and the origin to the control system, automated control of the objective switching device can be achieved. The control system can automatically adjust the position of the objective mount 1 as needed, thereby quickly and accurately switching to the desired objective.

[0039] In one embodiment, the objective lens switching device further includes a limiting sensor 18 and a photoelectric sensor 19. The first mounting block 2 and the second mounting block 3 are each provided with a limiting sensor 18, and the receiving groove 17 is provided with a photoelectric sensor 19. In this embodiment, the first mounting block 2 and the second mounting block 3 are each provided with a limiting sensor 18. These sensors are typically made of metal sheets or materials with specific reflective properties, used to trigger the signal of the photoelectric sensor 19. The receiving groove 17 contains the photoelectric sensor 19, which typically includes a transmitter and a receiver. The transmitter emits a light beam; when the light beam is blocked by the limiting sensor 18, the receiver receives a signal change, thereby triggering the corresponding control logic. When the objective lens mounting plate 1 (carrying the first mounting block 2 or the second mounting block 3) moves to a position close to the limit of its range of motion, the limiting sensor 18 blocks the light beam of the photoelectric sensor 19. At this time, the photoelectric sensor 19 detects the signal change and transmits this information to the control system. Based on the received signals, the control system can determine whether the objective mount 1 has reached its limit of motion and take corresponding measures, such as stopping the movement of the objective mount 1 or reversing its direction of movement, to prevent the objective mount 1 from exceeding its design range, causing damage or affecting accuracy. The cooperation between the limit sensor 18 and the photoelectric sensor 19 can effectively prevent the objective mount 1 from exceeding its design range during movement, thereby avoiding damage or malfunction caused by collision or excessive movement. This improves the safety and reliability of the entire objective switching device. By precisely controlling the movement range of the objective mount 1, the positional accuracy of the objective during switching can be ensured. This helps to achieve more accurate observation and measurement, and improve the accuracy of experiments or tests.

[0040] In one embodiment, the objective lens switching device further includes a hard limiting block 20. Both the first mounting block 2 and the second mounting block 3 are equipped with hard limiting blocks 20, which are used to mitigate collisions between the first mounting block 2 and the second mounting block 3 and the slider connecting plate 12. The main function of the hard limiting block 20 is to buffer the collisions between the first mounting block 2 and the second mounting block 3 and the slider connecting plate 12. During objective lens switching, if the objective lens mounting plate 1 (carrying the first mounting block 2 or the second mounting block 3) moves too fast or too far due to some reason (such as control system failure, external interference, etc.), the hard limiting block 20 can promptly contact the slider connecting plate 12, providing a buffering effect and thus avoiding or reducing damage caused by the collision. This design protects the slider connecting plate 12, the mounting blocks, and the objective lens itself, extending the service life of the entire objective lens switching device.

[0041] In one embodiment, the objective lens mounting plate 1 includes a first connecting section and a second connecting section, which are connected to form an L-shaped structure. The first connecting section is connected to a support plate 5, and the perpendicularity error between the first connecting section and the support plate 5 is less than 0.015 mm. The objective lens mounting area 7 is disposed on the second connecting section, and both the objective lens mounting area 7 and the light incident area 6 are through holes.

[0042] According to the objective lens switching device of this embodiment, the working process of the objective lens switching device mainly involves the movement of the moving components. When it is necessary to switch the objective lens, the moving rod 4 will reciprocate along the first direction (e.g., the horizontal direction). Since the first mounting block 2, the objective lens mounting plate 1, and the second mounting block 3 are fixedly connected end to end in sequence and are all mounted on the support plate 5, the movement of the moving rod 4 will move the objective lens mounting plate 1 together. The objective lens mounting plate 1 is provided with multiple objective lens mounting areas 7 along the first direction, and each area is equipped with an objective lens. As the objective lens mounting plate 1 moves, different objective lens mounting areas 7 will move sequentially to below the light entrance area 6 of the fixed component, thereby realizing the switching of different objectives. In this process, the objective lens switching device can ensure that each objective lens can move accurately to the light entrance area 6 to achieve accurate observation or detection. By reciprocating the movement of the moving rod 4 along the first direction, the objective lens switching device can accurately switch between different objectives. Since the objective lens mounting area 7 on the objective lens mounting plate 1 and the light-incident area 6 of the fixed assembly are arranged sequentially along a third direction (e.g., the vertical direction), each objective lens can accurately move below the light-incident area 6, thus ensuring the accuracy of observation or detection. At the same time, the support plate 5 provides a reliable force-bearing surface for the moving assembly. Since the first mounting block 2, the second mounting block 3, and the objective lens mounting plate 1 are all mounted on the support plate 5, and the first mounting block 2, the objective lens mounting plate 1, and the second mounting block 3 are connected end to end to form a loop structure, they can jointly bear the force generated during the movement, thereby avoiding deformation problems caused by uneven force distribution, so that the objective lens switching device can maintain high accuracy and stability during long-term use.

[0043] In addition, one embodiment of this utility model provides a measuring device, including multiple objective lenses and the objective lens switching device described in the above embodiment. Each objective lens mounting area 7 on the objective lens mounting plate 1 is equipped with one objective lens. In this embodiment, the different objective lenses have different magnifications. By installing objective lenses of different magnifications, the measuring device can adapt to measuring objects of different sizes and details, thereby improving the measurement accuracy. The introduction of the objective lens switching device allows the measuring personnel to quickly switch between different objective lenses without manually changing them, thereby improving the flexibility and efficiency of the measurement.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lens switching device, characterized in that, It includes a fixed component and a moving component. The moving component includes an objective lens mounting plate, a first mounting block, a second mounting block, a moving rod, and a support plate. The first mounting block, the second mounting block, and the objective lens mounting plate are all mounted on the support plate. The first mounting block and the second mounting block are arranged at intervals along a first direction, and the moving rod and the objective lens mounting plate are arranged at intervals along a second direction. The first mounting block, the objective lens mounting plate, the second mounting block and the moving rod are fixed in sequence, and the first mounting block and the moving rod are fixedly connected. The fixing component has a light-incident area, and the objective lens mounting plate has multiple objective lens mounting areas along the first direction. The light-incident area and the objective lens mounting areas are arranged along a third direction. The moving rod can reciprocate along the first direction so that each objective lens mounting area can be moved to a position opposite to the light-incident area. The first direction, the second direction, and the third direction are perpendicular to each other.

2. The objective lens switching device according to claim 1, characterized in that, The fixing assembly includes an objective lens switching plate and a driving assembly, wherein the objective lens switching plate is provided with the light incident area; The driving component is located on the objective lens switching plate and is used to drive the moving rod to reciprocate along the first direction.

3. The objective lens switching device according to claim 2, characterized in that, The driving component includes a coil, and the moving rod is a magnetic rod that passes through the coil. When the coil is energized, it generates a magnetic field. The magnetic rod is attracted or repelled by the magnetic field generated by the coil, which enables the magnetic rod to move back and forth along the first direction.

4. The objective lens switching device according to claim 2, characterized in that, The fixing component further includes a connecting seat, and the support plate is provided with a guide rail that extends along the first direction; The guide rail is slidably connected to the connecting seat, and the connecting seat is fixedly connected to the objective lens switching plate.

5. The objective lens switching device according to claim 4, characterized in that, The connecting base includes a detachably connected slider and a slider connecting plate. The guide rail is slidably connected to the slider, and the slider connecting plate is fixedly connected to the objective lens switching plate.

6. The objective lens switching device according to claim 5, characterized in that, The slider connecting plate is provided with a positioning part, which extends along the first direction. The positioning part and the slider connecting plate form a guide structure. The guide structure is used to increase the positional accuracy of the slider. The slider is disposed in the guide structure.

7. The objective lens switching device according to claim 5, characterized in that, The objective lens switching device also includes an origin device, a reading head, and a grating ruler. The grating ruler is disposed on the objective lens mounting plate and extends along the first direction. The slider connecting plate is provided with a receiving groove, the receiving groove has an opening on the side opposite to the slider, and the origin device and the reading head are located in the receiving groove.

8. The objective lens switching device according to claim 7, characterized in that, The objective lens switching device further includes a limiting sensor and a photoelectric sensor. The limiting sensor is provided on both the first mounting block and the second mounting block, and the photoelectric sensor is provided in the receiving groove.

9. The objective lens switching device according to claim 5, characterized in that, The objective lens switching device further includes a hard limiting block, which is provided on both the first mounting block and the second mounting block. The hard limiting block is used to reduce the collision between the first mounting block and the second mounting block and the slider connecting plate.

10. A measuring device, characterized in that, The device includes multiple objectives and an objective switching device as described in any one of claims 1-9, wherein each objective mounting area on the objective mounting plate is equipped with one of the objectives.

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