A slit control device

Abstract

The utility model relates to a kind of slit control devices, comprising: shell, cavity is formed inside;Two groups of slit components, symmetrically set in the cavity, each slit component includes slider and slit sheet, the slit sheet is connected on the slider;Two groups of driving components are respectively set in one group slit component side away from another group slit component, each driving component includes tension spring and piezoelectric driving piece, the driving end of piezoelectric driving piece extends into the cavity and abuts one group of the slider of slit component, one end of the tension spring is connected with the slider of one group of slit component, and the other end is connected with the shell.The slit control device of the utility model is compact in structure and high in adjustment accuracy.

Description

Technical Field

[0001] This utility model relates to the field of optical analysis instrument technology, and more specifically, to a slit control device. Background Technology

[0002] A spectrometer is a sophisticated scientific instrument used to separate polychromatic light according to different wavelengths and form a continuous spectrum. By measuring the intensity, position, and shape of spectral lines, qualitative and quantitative analysis of elements in a substance can be achieved. Therefore, spectrometers are widely used in many fields such as environmental monitoring, astrophysics, biomedicine, and materials science. When light enters a spectrometer, it first passes through a slit device. This slit device is a key component determining the spectrometer's performance, forming a narrow, well-defined, and precisely positioned optical channel for light to enter. The width of the slit is a crucial parameter of the spectrometer, directly affecting its resolution and light transmission. A narrower slit improves the spectrometer's resolution, clearly distinguishing spectral lines of similar wavelengths entering the spectrometer, but reduces the amount of light entering. A wider slit allows for greater light transmission, but may cause light of different wavelengths to mix together, reducing the spectrometer's resolution.

[0003] Currently, the slit devices in existing spectrometers generally use a transmission system consisting of a motor, lead screw, coupling, and differential head to drive the opening and closing of the slit. The transmission system technology of existing slit devices is mature, cost-effective, and can provide a large linear drive stroke to meet the requirements of the slit opening and closing width adjustment range. However, existing slit devices still have some shortcomings.

[0004] First, the adjustment precision is low. Existing slit devices suffer from large and uneven displacement due to the motor rotation. Even with a differential head, the step size remains unstable, making it difficult to achieve precise displacement control at the micrometer level. Consequently, the existing slit width is insufficient to meet the high-resolution requirements of spectrometers.

[0005] Secondly, the structure is complex. Existing slit devices mostly use independent components such as motors, lead screws, couplings, and differential heads to form a long transmission chain through precision assembly. This not only makes the transmission system of existing slit devices have many parts and occupy a lot of space, but also makes the assembly process cumbersome and requires high precision of the parts. As a result, existing slit devices are large in size and difficult to adapt to the installation requirements of miniaturized spectrometers. Utility Model Content

[0006] The purpose of this invention is to provide a slit control device to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution.

[0008] This utility model provides a slit control device, which includes: The outer shell has an internal cavity. Two sets of slit assemblies are symmetrically arranged in the cavity. Each slit assembly includes a slider and a slit plate, and the slit plate is connected to the slider. Two sets of drive components are respectively disposed on the side of one set of slit components away from the other set of slit components. Each drive component includes a tension spring and a piezoelectric actuator. The drive end of the piezoelectric actuator extends into the cavity and abuts against the slider of one set of slit components. One end of the tension spring is connected to the slider of one set of slit components, and the other end is connected to the outer shell.

[0009] In some embodiments of this application, the opposing ends of the slit plates of the two sets of slit assemblies form a straight slit or a star-shaped slit when brought close together.

[0010] In some embodiments of this application, the two ends of the tension spring are respectively connected to the slider and the housing by two fasteners.

[0011] In some embodiments of this application, a guide mechanism is further provided inside the cavity, and the slider is movably connected to the guide mechanism and can slide along the guide mechanism.

[0012] In some embodiments of this application, the guiding mechanism is two crossed roller guides.

[0013] In some embodiments of this application, the inner side of the housing is provided with two mounting grooves along the sliding direction of the slider, and the mounting grooves are used to mount the cross roller guide rail.

[0014] In some embodiments of this application, the housing is further provided with two support blocks, which are used to fix the piezoelectric drive component.

[0015] In some embodiments of this application, the piezoelectric drive element is a piezoelectric screw.

[0016] In some embodiments of this application, the housing is provided with an incident light aperture and an exit light aperture, the incident light aperture and the exit light aperture being located on opposite sides of the slit plate, respectively.

[0017] As can be seen from the above technical solution, the embodiments of this utility model have at least the following advantages and positive effects: 1. High adjustment precision. This utility model's slit control device achieves precise control of the slit width by setting a drive assembly including a tension spring and a piezoelectric drive. During the slit opening process, the piezoelectric drive retracts under external drive. At this time, the tension spring resets under the action of elastic force, causing the slider and the slit plate connected to the slider to move away from each other, ensuring that the slider always maintains contact with the piezoelectric drive; the slit opens during this process, and the slit width gradually increases. During the slit closing process, the piezoelectric drive extends under external drive to abut against the slider and pushes the slider to move. At this time, the tension spring is gradually stretched, thereby causing the slider and the slit plate fixed to the slider to move closer together, and the slit width gradually decreases until it closes. Because the piezoelectric actuator can achieve submicron or even micron-level displacement precision control and can lock itself when stationary, it ensures that the piezoelectric actuator can remain in its original position when the external drive stops, thus ensuring that the slit width remains unchanged. This invention uses a piezoelectric actuator and a tension spring to control the opening and closing of the slit in a coordinated manner, which greatly improves the adjustment accuracy of the slit width of the slit control device of this invention, so that the slit width of the slit control device of this invention can meet the high resolution requirements of more precise spectrometers.

[0018] 2. Compact Structure. The slit control device of this invention integrates two sets of slit components, including a slider and a slit plate, within a cavity formed by the outer shell. A piezoelectric drive extending into the cavity and abutting against the slider, along with tension springs connected at both ends to the slider and the outer shell, collaboratively control the opening and closing of the slit. This simplifies the transmission system for controlling the slit width, reduces the number of components required, and consequently lowers the cost and assembly complexity of the device. This achieves overall compactness and miniaturization, making the slit control device particularly suitable for small spectrometers. Attached Figure Description

[0019] The various objectives, features, and advantages of this invention will become more apparent from the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The drawings are merely illustrative illustrations of the invention and are not necessarily drawn to scale. In the drawings, the same reference numerals always denote the same or similar parts. Wherein: Figure 1 This is a schematic diagram of the structure of a star-shaped slit in a slit control device according to this utility model.

[0020] Figure 2 This is a cross-sectional structural diagram of a star-shaped slit in a slit control device according to this utility model.

[0021] Figure 3 This is a cross-sectional view of the star-shaped slit of the slit control device of this utility model from another angle.

[0022] Figure 4 This is a schematic diagram of the structure of the star-shaped slit assembly of this utility model.

[0023] Figure 5 This is a schematic diagram of the structure of the base plate of this utility model.

[0024] Figure 6 This is a top-view cross-sectional view of the star-shaped slit structure of a slit control device according to this utility model.

[0025] Figure 7 This is a schematic diagram of the structure of a linear slit in a slit control device according to this utility model.

[0026] The annotations in the attached figures are explained as follows: 1. Outer shell; 11. Cover plate; 12. Base plate; 121. First mounting hole; 122. Mounting groove; 123. Support block; 1231. Through hole; 124. Light emission hole; 2. Slit assembly; 21. Slider; 211. Second mounting hole; 212. Guide groove; 22. Slit plate; 3. Drive assembly; 31. Tension spring; 32. Piezoelectric drive component; 4. Fasteners; 5. Cross roller guide. Detailed Implementation

[0027] Although the present invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0028] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0029] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0030] Please see Figures 1 to 3 The slit control device provided in one embodiment of the present invention includes a housing 1, two sets of slit assemblies 2 and two sets of drive assemblies 3.

[0031] The outer shell 1 has an internal cavity.

[0032] Two sets of slit assemblies 2 are symmetrically arranged in the cavity. Each slit assembly 2 includes a slider 21 and a slit plate 22, with the slit plate 22 connected to the slider 21.

[0033] Two sets of drive components 3 are respectively disposed on the side of one set of slit components 2 away from the other set of slit components 2. Each drive component 3 includes a tension spring 31 and a piezoelectric drive element 32. The drive end of the piezoelectric drive element 32 extends into the cavity and abuts against the slider 21 of one of the slit components 2. One end of the tension spring 31 is connected to the slider 21 of one set of slit components 2, and the other end is connected to the outer shell 1.

[0034] This utility model's slit control device achieves precise control of the slit width by setting a drive assembly 3 including a tension spring 31 and a piezoelectric drive element 32. During the slit opening process, the piezoelectric drive element 32 retracts under external drive. At this time, the tension spring 31 resets under the action of elastic force, causing the slider 21 and the slit plate 22 connected to the slider 21 to move away from each other, ensuring that the slider 21 always remains in contact with the piezoelectric drive element 32; the slit opens during this process, and the slit width gradually increases. During the slit closing process, the piezoelectric drive element 32 extends under external drive to abut against the slider 21 and pushes the slider 21 to move. At this time, the tension spring 31 is gradually stretched, thereby causing the slider 21 and the slit plate 22 fixed to the slider 21 to move closer together, and the slit width gradually decreases until it closes. Because the piezoelectric actuator 32 can achieve submicron or even micron-level displacement precision control and can lock itself when stationary, it ensures that the piezoelectric actuator 32 can remain in its original position when the external drive stops, thus ensuring that the slit width remains unchanged. This utility model uses the piezoelectric actuator 32 and the tension spring 31 to control the opening and closing of the slit in a coordinated manner, which greatly improves the adjustment accuracy of the slit width of the slit control device of this utility model, so that the slit width of the slit control device of this utility model can meet the high resolution requirements of more precise spectrometers.

[0035] Furthermore, the slit control device of this invention integrates two sets of slit components 2, including a slider 21 and a slit plate 22, within the cavity formed by the outer shell 1. A piezoelectric drive 32 extending into the cavity and abutting against the slider 21, and a tension spring 31 connected at both ends to the slider 21 and the outer shell 1 respectively, collaboratively control the opening and closing of the slit. This simplifies the transmission system for controlling the slit width, reduces the number of components required, and consequently lowers the cost and assembly complexity of the slit control device. It achieves overall compactness and miniaturization, making the slit control device particularly suitable for small spectrometers.

[0036] Please see Figure 1 and Figure 5 In a preferred embodiment, the opposing ends of the slit plates 22 of the two sets of slit assemblies 2 form a straight slit or a star-shaped slit when brought close together. The straight slit provides a uniform light transmission width, suitable for most conventional spectrometers; the star-shaped slit offers better stability for submicron or nanometer-level light transmission, suitable for the extremely low light transmission requirements of precision spectrometers (such as micro Raman spectrometers). This broadens the applicability of the slit control device of this invention.

[0037] Please see Figure 3 In a preferred embodiment, the two ends of the tension spring 31 are respectively connected to the slider 21 and the housing 1 by two fasteners 4. Specifically, the housing 1 has a first mounting hole 121, and the slider 21 has a second mounting hole 211. The two fasteners 4 are fixed to the housing 1 and the slider 21 respectively through the first mounting hole 121 and the second mounting hole 211; the two hooks at both ends of the tension spring 31 are hooked onto the two fasteners 4. Thus, when the tension spring 31 fails due to fatigue from long-term use, maintenance personnel do not need to disassemble the entire transmission system of the slit control device of this utility model. They only need to remove the fasteners 4 at both ends of the failed tension spring 31 to replace the tension spring 31. It is understood that the mounting hole includes, but is not limited to, a smooth hole and a threaded hole; the fastener 4 includes, but is not limited to, a pin and a bolt. In this embodiment, the mounting hole is a threaded hole, and the fastener 4 is a bolt.

[0038] In a preferred embodiment, a guide mechanism is also provided within the cavity. The slider 21 is movably connected to the guide mechanism and can slide along the guide mechanism. By providing a guide mechanism within the cavity, it is ensured that the slider 21 moves smoothly and steadily along a preset path within the cavity.

[0039] Please see Figure 2 and Figure 6In a preferred embodiment, the guiding mechanism consists of two crossed roller guides 5. The crossed roller guides 5 have good rigidity and are not easily deformed under force, providing stable support and guidance for the sliding of the slider 21, thereby ensuring that the slider 21 moves smoothly without shaking.

[0040] Please see Figure 2 , Figure 4 , Figure 5 , Figure 6 In a preferred embodiment, the inner side of the outer casing 1 is provided with two mounting grooves 122 along the sliding direction of the slider 21. The mounting grooves 122 are used to mount the cross roller guide rails 5. Specifically, the two cross roller guide rails 5 are embedded in the two mounting grooves 122; each slider 21 has two guide grooves 212 on opposite sides that are adapted to the shape of the two cross roller guide rails. This allows the slider 21 to slide along the cross roller guide rails 5 by rolling friction. Since rolling friction reduces wear on the contact surface and decreases vibration, it extends the service life of both the cross roller guide rails 5 and the slider 21, and makes the sliding of the slider 21 smoother.

[0041] Please see Figure 1 , Figure 2 and Figure 5 In a preferred embodiment, the outer casing 1 is further provided with two support blocks 123, which are used to fix the piezoelectric drive element 32. Specifically, the support block 123 is provided with a through hole 1231, the shape of which is adapted to the shape of the driving end of the piezoelectric drive element 32, and the driving end of the piezoelectric drive element 32 slides through the through hole 1231 of the support block 123 and abuts against the slider 21. By providing support blocks 123 for fixing the piezoelectric drive element 32, a foundation for its installation is provided, preventing the piezoelectric drive element 32 from shaking or shifting due to insecure installation during the movement of the slider 21, thereby ensuring the smooth movement of the slider 21.

[0042] In a preferred embodiment, the piezoelectric actuator 32 is a piezoelectric screw. As a standardized piezoelectric actuator 32, the piezoelectric screw can generate precise linear extension and contraction movements at the sub-micron or nanometer level under external driving. The piezoelectric screw has a compact structure and is easy to install; moreover, it can self-lock in a static state, exhibiting good long-term stability. Because the piezoelectric screw can provide high-resolution linear motion control, the slit control device of this invention meets the high-resolution requirements of more precise spectrometers. In this embodiment, the piezoelectric screw selected for the slit control device of this invention meets the following technical specifications: the piezoelectric screw has a resolution greater than 20 nm, a rated load of not less than 30 N, a working stroke of not less than 18 mm, and a driving speed of not less than 6 mm / min.

[0043] Please see Figure 1 and Figure 7 In a preferred embodiment, the outer casing 1 is provided with an incident light aperture (not shown in the figure) and an exit light aperture 124, which are located on opposite sides of the slit plate 22. Thus, when the slit control device of this invention is applied to a spectrometer, the light to be measured first enters the slit control device through the incident light aperture on the cover plate 11, then through the slit formed by the two slit plates 22, and finally enters the subsequent optical spectrometer system through the exit light aperture 124 on the base plate 12.

[0044] Please see Figures 1 to 7 In a preferred embodiment, the housing 1 includes a cover plate 11 and a base plate 12, which are detachably connected. Specifically, the cover plate 11 has an incident light hole, and the base plate 12 has an exit light hole 124; the base plate 12 has a first mounting hole 121, through which a fastener 4 is fixed to the base plate 12, and one end of the tension spring 31 is hooked onto the fastener 4; the base plate 12 has two mounting grooves 122 for mounting two cross roller guides 5; the base plate 12 also has two support blocks 123, each of which is located at the end of the base plate 12 near the piezoelectric drive member 32. Therefore, the slit control device of this utility model uses the base plate 12 as the installation reference for the slit assembly 2 and the drive assembly 3. When maintenance is required, maintenance personnel only need to remove the cover plate 11 to directly and conveniently inspect the core drive and transmission components of the slit control device of this utility model. It is understood that the detachable connection includes, but is not limited to, threaded connection, snap-fit ​​connection, etc. In this embodiment, the cover plate 11 and the base plate 12 are connected by threads.

[0045] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A slit control device, characterized in that, include: The outer shell has an internal cavity. Two sets of slit assemblies are symmetrically arranged in the cavity. Each slit assembly includes a slider and a slit plate, and the slit plate is connected to the slider. Two sets of drive components are respectively disposed on the side of one set of slit components away from the other set of slit components. Each drive component includes a tension spring and a piezoelectric actuator. The drive end of the piezoelectric actuator extends into the cavity and abuts against the slider of one set of slit components. One end of the tension spring is connected to the slider of one set of slit components, and the other end is connected to the outer shell.

2. The slit control device according to claim 1, characterized in that, The opposing ends of the slit plates of the two sets of slit assemblies form a straight slit or a star-shaped slit when they are brought close together.

3. The slit control device according to claim 1, characterized in that, The two ends of the tension spring are respectively connected to the slider and the housing by two fasteners.

4. The slit control device according to claim 1, characterized in that, The cavity is also equipped with a guide mechanism, and the slider is movably connected to the guide mechanism and can slide along the guide mechanism.

5. The slit control device according to claim 4, characterized in that, The guiding mechanism consists of two crossed roller guides.

6. The slit control device according to claim 5, characterized in that, The inner side of the housing is provided with two mounting grooves along the sliding direction of the slider, and the mounting grooves are used to install the cross roller guide rail.

7. The slit control device according to claim 1, characterized in that, The housing is also provided with a support block, which is used to fix the piezoelectric drive component.

8. The slit control device according to claim 1, characterized in that, The piezoelectric drive component is a piezoelectric screw.

9. The slit control device according to claim 1, characterized in that, The outer casing is provided with an incident light aperture and an exit light aperture, which are located on opposite sides of the slit plate.

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