Filter wheel and filter device

Abstract

The utility model relates to the technical field of optical test equipment, in particular to a filter wheel and a filter device, the filter wheel comprises a wheel carrier, the wheel carrier is a hollow regular polygon prism structure with even-numbered edges, and the end part of the wheel carrier is provided with a connecting shaft; the two opposite side walls of the wheel carrier are evenly provided with the optical filters and the light-transmitting pieces, the optical filters and the light-transmitting pieces are the same in size and weight, the rotating shaft can be prevented from blocking an optical path, global imaging of the optical filtering area can be achieved, the imaging quality of optical equipment can be ensured, and the optical equipment has the advantage of being wide in application range. The light filtering device comprises a mounting bracket; according to the filter wheel, the wheel carrier is connected to the mounting bracket through the connecting shaft, and the wheel carrier can rotate around the axis of the connecting shaft; and the driving assembly is in transmission connection with the connecting shaft.

Description

Technical Field

[0001] This utility model relates to the field of optical testing equipment technology, specifically to a filter wheel and a filter device. Background Technology

[0002] In studies investigating the composition and distribution of arcs in vacuum circuit breakers, high-speed camera imaging of the arc light is a crucial method for obtaining relevant information. Before the light enters the high-speed camera, it must be filtered using multiple filters that remove different wavelengths to obtain images of specific wavelengths. These images can reflect the spatial distribution of the arc components corresponding to specific wavelengths. However, filters have the characteristic of allowing only specific wavelengths of light to pass through while reflecting other wavelengths. This means that a single image captured by a high-speed camera typically contains only one wavelength of light, thus only showing the spatial distribution characteristics of one arc component.

[0003] Meanwhile, in the field of optomechanics, multispectral imaging technology is crucial for acquiring feature information of objects under different spectra. As a key component for realizing multispectral imaging, the performance of the filter wheel directly affects the imaging quality and application range of the entire optical device.

[0004] To capture multiple wavelengths of light simultaneously in a single photograph, the common approach is to use multiple filters. The filter wheel, a frequently used filter switching device, is typically driven electrically or manually, with its rotation axis parallel to the optical path. During operation, the filter wheel rotates at high speed, allowing specific wavelengths of light to pass through the filter and be imaged on the same film of the high-speed camera within a frame interval. While existing filter wheels meet the requirements for multi-wavelength imaging to some extent, their rotation axis and mounting bracket are located in the optical path, which can block some light, thus limiting the imaging range. Utility Model Content

[0005] To address the technical problem of light obstruction caused by the rotating shaft and mounting bracket of existing filter wheels, this invention provides a filter wheel and filter device that can avoid the rotating shaft from blocking the light path, thereby achieving full-area imaging in the filter area, ensuring the imaging quality of optical equipment, and having a wide range of applications.

[0006] This utility model is achieved through the following technical solution:

[0007] In a first aspect, the present invention provides a filter wheel, including a wheel frame, wherein the wheel frame is a hollow regular polygonal prism structure with an even number of sides and a connecting shaft is provided at the end; each of the two opposite side walls of the wheel frame is provided with a filter and a light-transmitting sheet, wherein the filter and the light-transmitting sheet are the same in size and weight.

[0008] It should be noted that the existing filter wheel's rotating shaft and mounting bracket are located in the optical path, which blocks some light and limits the imaging range. Furthermore, the existing filter wheel is circular, with a large lateral area, which not only occupies too much space but also increases the overall complexity of the device. As a result, in some special applications, such as multispectral imaging of space telescopes, it cannot meet the stringent requirements of compactness and lightweight design.

[0009] To address this issue, the present invention provides a filter wheel comprising a frame, which is a hollow, even-sided regular polygonal prism structure with a connecting shaft at one end. Filters and light-transmitting sheets are respectively disposed on opposite side walls of the frame. In use, the frame is rotatably connected to the corresponding mounting bracket via the connecting shaft, causing the frame to rotate around the axis of the connecting shaft. Simultaneously, light from the light source enters through the filter on one side, passes through the hollow inner cavity of the frame, and exits through the light-transmitting sheet. This transforms the existing light propagation direction of the filter wheel, which is parallel to the axis of rotation, into a direction perpendicular to the axis of rotation. Furthermore, the axis of rotation of the filter wheel is not within the filtering area, effectively preventing the rotation axis from obstructing the light path. This achieves full-area imaging within the filtering area, ensuring the imaging quality of the optical equipment and offering a wide range of applications.

[0010] Furthermore, the filter and the transmittance are the same size and weight, allowing the transmittance to balance the rotation of the filter and avoid polarization caused by the weight difference of the wheel frame sidewalls. Meanwhile, the wheel frame is a hollow, even-sided regular polygonal prism structure. On one hand, compared to existing circular filter wheels, this not only helps to disperse rotational stress but also allows for a more rational arrangement of the filters within a limited space, improving the stability and efficiency of filter switching. On the other hand, while ensuring structural strength, it significantly reduces the overall weight of the device, thereby reducing energy consumption and minimizing the inertial effects during filter wheel rotation, resulting in smoother and more precise rotation.

[0011] In an optional embodiment of this application, both the filter and the light-transmitting sheet are detachably connected to the wheel frame, so as to replace the filter and the corresponding light-transmitting sheet with the appropriate specifications according to the test requirements.

[0012] In an optional embodiment of this application, the wheel frame is magnetic, and both the filter and the light-transmitting sheet are fitted with magnetically attachable frames; each inner edge of the wheel frame is provided with a limiting protrusion, the limiting protrusion is parallel to the connecting shaft, and two adjacent limiting protrusions can engage the filter and the light-transmitting sheet, so as to facilitate quick assembly and disassembly of the filter and the light-transmitting sheet while ensuring the stability of the filter and the light-transmitting sheet during installation and operation.

[0013] In an optional embodiment of this application, connecting shafts are provided at both ends of the wheel frame to ensure the stability of the wheel frame during rotation.

[0014] In an optional embodiment of this application, the sidewalls of the wheel frame are made of magnetic stainless steel to ensure that the wheel frame has sufficient magnetism while also being sufficiently durable.

[0015] In an optional embodiment of this application, the wheel frame is a regular octahedral prism to achieve four types of spectral imaging.

[0016] Secondly, this utility model provides a light filtering device, comprising: a mounting bracket; the aforementioned light filtering wheel, wherein the wheel frame is connected to the mounting bracket via the connecting shaft, and the wheel frame is rotatable around the axis of the connecting shaft; and a driving assembly, wherein the driving assembly is kinetically connected to the connecting shaft.

[0017] This allows the light from the light source to enter through the filter on one side, pass through the hollow inner cavity of the wheel frame, and exit through the light-transmitting sheet during the experiment. This transforms the existing light propagation direction of the filter wheel, which was parallel to its rotation axis, into a direction perpendicular to its rotation axis. Furthermore, the rotation axis of the filter wheel is no longer within the filtering area, effectively preventing the rotation axis from obstructing the light path. This achieves full-area imaging within the filtering area, ensuring the imaging quality of the optical equipment, expanding its application range, and significantly reducing the overall weight of the device, thereby lowering energy consumption. It also reduces the inertial effects during the rotation of the filter wheel, making the rotation smoother and more precise.

[0018] In an optional embodiment of this application, the drive assembly includes a drive motor and a timing belt. The drive motor is connected to the connecting shaft corresponding to the timing belt to facilitate precise control of the rotation angle of the wheel frame.

[0019] In an optional embodiment of this application, a mounting base is also included, on which both the mounting bracket and the drive motor are mounted to ensure the stability of the wheel frame rotation.

[0020] It is understandable that vibrations generated by a rotating structure can affect image sharpness and reduce image quality. In an optional embodiment of this application, the bottom of the mounting base is equipped with a high-damping rubber pad to dissipate energy and reduce vibrations caused by the rotation of the device, thereby minimizing the impact of vibrations on image sharpness.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] 1. The filter wheel provided by this utility model includes a wheel frame, which is a hollow, even-sided regular polygonal prism structure with a connecting shaft at one end. Filters and light-transmitting sheets are evenly distributed on opposite side walls of the wheel frame. In use, the wheel frame is rotatably connected to the corresponding mounting bracket via the connecting shaft, causing the wheel frame to rotate around the axis of the connecting shaft. Simultaneously, light from the light source enters through the filter on one side, passes through the hollow inner cavity of the wheel frame, and exits through the light-transmitting sheet. This transforms the existing light propagation direction of the filter wheel, which is parallel to the rotation axis of the filter wheel, into a light propagation direction perpendicular to the rotation axis of the filter wheel. Furthermore, the rotation axis of the filter wheel is not within the filtering area, effectively avoiding the obstruction of the light path by the rotation axis. This achieves full-area imaging within the filtering area, ensuring the imaging quality of the optical equipment and possessing a wide range of applications.

[0023] 2. The filter wheel provided by this utility model has the same size and weight for the filter and the light transmittance. It can balance the rotation of the filter through the light transmittance and avoid polarization caused by the difference in weight of the wheel frame sidewall.

[0024] 3. The filter wheel provided by this utility model has a hollow, even-sided regular polygonal prism structure as its frame. On the one hand, compared with the existing circular filter wheel, it not only helps to disperse rotational stress, but also allows for a more reasonable arrangement of filters within a limited space, improving the stability and efficiency of filter switching. On the other hand, while ensuring structural strength, it significantly reduces the total weight of the device, thereby reducing energy consumption and minimizing the inertial influence during the rotation of the filter wheel, making the rotation more stable and precise.

[0025] 4. The filtering device provided by this utility model includes a mounting bracket; the aforementioned filter wheel, wherein the wheel frame is connected to the mounting bracket via the connecting shaft, and the wheel frame is rotatable around the axis of the connecting shaft; and a driving assembly, which is connected to the connecting shaft for transmission, so that during the test, the light from the light source enters from the filter on one side, passes through the hollow inner cavity of the wheel frame, and exits from the light-transmitting sheet, thereby changing the existing light propagation direction of the filter wheel being parallel to the rotation axis of the filter wheel, to a light propagation direction perpendicular to the rotation axis of the filter wheel, and the rotation axis of the filter wheel is not within the filtering area, thereby effectively avoiding the obstruction of the light path by the rotation axis, thus achieving full-area imaging of the filtering area, ensuring the imaging quality of the optical equipment, having a wide range of applications, and significantly reducing the total weight of the device, thereby reducing energy consumption, reducing the inertial influence during the rotation of the filter wheel, and making the rotation more stable and precise. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] In the attached diagram:

[0028] Figure 1 This is a schematic diagram of the structure of the filtering device provided in the embodiments of this application.

[0029] The attached figures include reference numerals and their corresponding component names:

[0030] 1-Wheel frame, 2-Connecting shaft, 3-Filter, 4-Light transmittance sheet, 5-Limiting protrusion, 6-Mounting bracket, 7-Drive motor, 8-Synchronous belt, 9-Mounting base, 10-High damping rubber pad. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] In the description of the embodiments of this application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0035] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] Example 1

[0037] Combination Figure 1 This embodiment provides a filter wheel, including a wheel frame 1. The wheel frame 1 is a hollow regular polygonal prism structure with an even number of sides and a connecting shaft 2 at the end. Each of the two opposite side walls of the wheel frame 1 is provided with a filter 3 and a light-transmitting sheet 4. The filter 3 and the light-transmitting sheet 4 have the same size and weight.

[0038] It is understood that the shape of the wheel frame 1 is determined according to the usage requirements, and can be a square prism, hexagonal prism, octagonal prism, decagonal prism, etc. In this embodiment, the wheel frame 1 is a regular octahedral prism, and four filters 3 are arranged in close succession to achieve four types of spectral imaging in a small volume.

[0039] Furthermore, both the filter 3 and the light-transmitting sheet 4 are detachably connected to the wheel frame 1. For example, the filter 3 and the light-transmitting sheet 4 can be installed on the wheel frame 1 through detachable connection methods such as screw connection, pin connection, or snap connection, so that the filter 3 and the corresponding light-transmitting sheet 4 of the corresponding specifications can be replaced according to the test requirements.

[0040] Specifically, the wheel frame 1 is magnetic, such as by directly using a magnet to make the wheel frame 1 or by installing permanent magnets on each side wall of the wheel frame 1. Both the filter 3 and the light-transmitting sheet 4 are equipped with magnetically attractive frames, that is, both the filter 3 and the light-transmitting sheet 4 are wrapped with frames made of magnetically attractive materials, such as frames made of iron or magnets.

[0041] In this embodiment, the sidewall of the wheel frame 1 is made of magnetic stainless steel to ensure that the wheel frame 1 has sufficient magnetism while also having sufficient durability.

[0042] Meanwhile, each inner edge of the wheel frame 1 is provided with a limiting protrusion 5. The limiting protrusion 5 is parallel to the connecting shaft 2, and two adjacent limiting protrusions 5 can engage the filter 3 and the light-transmitting sheet 4, so as to facilitate quick disassembly and assembly of the filter 3 and the light-transmitting sheet 4 while ensuring the stability of the installation and operation of the filter 3 and the light-transmitting sheet 4.

[0043] The wheel frame 1 is provided with connecting shafts 2 at both ends to ensure the stability of the wheel frame 1 when it rotates.

[0044] It should be noted that the centrifugal force generated when the filter wheel rotates will further increase the pressure between the filter 3 and the wheel frame 1, thereby increasing the friction between the two contact surfaces and preventing the filter 3 from sliding.

[0045] In summary, in this embodiment, the shape of the filter wheel frame 1 is a regular octahedral prism, with each edge made of stainless steel. The vertices and centers of each side of the frame 1 are connected by stainless steel strips, and a prism-shaped limiting strip is located at the connection point between the two sides. In use, a rectangular filter 3 with a metal frame is attached to the frame 1 and inserted into the limiting protrusion 5. A rectangular light-transmitting sheet 4 of equal weight is attached to the opposite support in the same manner for balancing.

[0046] In this embodiment, the wheel frame 1 and the corresponding mounting bracket 6 are rotatably connected by the connecting shaft 2, causing the wheel frame 1 to rotate around the axis of the connecting shaft 2. At the same time, the light from the light source enters from the filter 3 on one side, passes through the hollow inner cavity of the wheel frame 1, and exits from the light-transmitting sheet 4. This changes the existing light propagation direction of the filter wheel, which is parallel to the rotation axis of the filter wheel, to a light propagation direction that is perpendicular to the rotation axis of the filter wheel. Furthermore, the rotation axis of the filter wheel is not within the filtering area, thus effectively avoiding the obstruction of the light path by the rotation axis. This achieves full-area imaging of the filtering area, ensuring the imaging quality of the optical equipment and having a wide range of applications.

[0047] Among them, the filter 3 and the light transmittance 4 are the same size and weight, and the rotation of the filter 3 can be balanced by the light transmittance 4 to avoid polarization caused by the different weight of the side wall of the wheel frame 1.

[0048] In addition, the wheel frame 1 is a hollow, even-sided regular polygonal prism structure. On the one hand, compared with the existing circular filter wheel, it not only helps to disperse rotational stress, but also allows for a more reasonable arrangement of the filter 3 in a limited space, improving the stability and efficiency of filter 3 switching. On the other hand, while ensuring structural strength, it significantly reduces the total weight of the device, thereby reducing energy consumption and reducing the inertial influence during the rotation of the filter wheel, making the rotation more stable and precise.

[0049] Example 2

[0050] Combination Figure 1 This embodiment provides a filtering device, including: a mounting bracket 6; a filtering wheel as described in Embodiment 1, wherein the wheel frame 1 is connected to the mounting bracket 6 via the connecting shaft 2, and the wheel frame 1 is rotatable around the axis of the connecting shaft 2; and a driving assembly, wherein the driving assembly is throttle-connected to the connecting shaft 2.

[0051] This allows the light from the light source to enter through the filter 3 on one side, pass through the hollow inner cavity of the wheel frame 1, and exit through the light-transmitting plate 4 during the experiment. This transforms the existing light propagation direction of the filter wheel, which is parallel to the rotation axis of the filter wheel, into a light propagation direction that is perpendicular to the rotation axis of the filter wheel. Furthermore, the rotation axis of the filter wheel is not within the filtering area, thus effectively avoiding the obstruction of the light path by the rotation axis. This enables full-area imaging of the filtering area, ensuring the imaging quality of the optical equipment, and expanding its application range. In addition, it significantly reduces the overall weight of the device, thereby reducing energy consumption and minimizing the inertial effects during the rotation of the filter wheel, making the rotation more stable and precise.

[0052] Specifically, the drive assembly includes a drive motor 7 and a timing belt 8. The drive motor 7 is connected to the connecting shaft 2 corresponding to the timing belt 8 to facilitate precise control of the rotation angle of the wheel frame 1.

[0053] This embodiment also includes a mounting base 9, on which both the mounting bracket 6 and the drive motor 7 are mounted to ensure the stability of the wheel frame 1's rotation.

[0054] Based on this, a high-damping rubber pad 10 is provided at the bottom of the mounting base 9. It should be understood that high-damping rubber is an elastic material whose energy dissipation capability is significantly improved through molecular structure design or the addition of special fillers. Its core indicator is a loss factor (tanδ) typically greater than 0.3, far higher than that of ordinary rubber (tanδ≈0.05-0.2). This characteristic allows it to quickly convert mechanical vibration energy into heat energy, thereby effectively suppressing resonance and reducing noise. Thus, by dissipating energy through the high-damping rubber pad 10, the vibration caused by the device's rotation is reduced, minimizing the impact of vibration on image clarity.

[0055] It should be noted that in this embodiment, the drive motor 7 is a stepper motor, which is fixed on the base of the device. The stepper motor and the connecting shaft 2 of the filter wheel are connected by a single-sided toothed synchronous belt 8, which can precisely control the rotation angle and speed. The connecting shaft 2 and the mounting bracket 6 are connected by bearings to reduce frictional resistance and ensure the stability and reliability of the device operation.

[0056] Specifically, one end face of the wheel frame 1 is connected to the bearing via a connecting shaft 2. The bearing is fixed on the mounting bracket 6. The mounting bracket 6 is fixed to the mounting base 9 via a fixed connection method such as rivets or welding. The other end face of the wheel frame 1 is connected to the synchronous pulley via a connecting shaft 2. The drive motor 7 is fixed to the mounting base 9. The drive motor 7 is connected to the synchronous pulley via a single-sided toothed synchronous belt 8.

[0057] In a specific application example, a high-speed camera with a frame rate of 10000 FPS is used, and the angular velocity of the filter wheel is 2500π rad / s. The filter wheel is then adjusted to an angle perpendicular to the light source using any filter 3. The high-speed camera is adjusted to a height where the lens is aligned with the center of filter 3, and the drive motor 7 and the high-speed camera are turned on. At this point, light passes through filter 3 and is exposed on the film. Then, the wheel holder 1 rotates 45° until the next filter 3 is in a vertical position, and light passes through the next filter 3 and is exposed on the film. This process is repeated to obtain images of different wavelengths of light within a very short time interval.

[0058] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An optical filter wheel, characterized in that, Including wheel frame (1), the wheel frame (1) is hollow even number side regular polygonal prism structure, end is provided with connecting shaft (2); Each opposite two side walls of the wheel frame (1) are provided with filter (3) and light transmission sheet (4), the size and weight of the filter (3) and the light transmission sheet (4) are identical.

2. The filter wheel of claim 1, wherein, The filter (3) and the light transmission sheet (4) are detachably connected with the wheel frame (1).

3. The filter wheel of claim 2, wherein, The wheel frame (1) has magnetism, the filter (3) and the light transmission sheet (4) are all adapted with magnetic frame edge; Each inner side edge of the wheel frame (1) is provided with limiting convex rib (5), the limiting convex rib (5) is parallel with the connecting shaft (2), and adjacent two limiting convex ribs (5) can be clamped the filter (3) and the light transmission sheet (4).

4. The filter wheel of claim 1, wherein, Both ends of the wheel frame (1) are provided with connecting shaft (2).

5. The filter wheel of claim 1, wherein, The side wall of the wheel frame (1) is magnetic stainless steel material.

6. The filter wheel according to any one of claims 1 to 5, characterized in that The wheel frame (1) is regular octahedral prism.

7. A light filtering device, characterized in that Including: Mounting bracket (6); The filter wheel of any one of claims 1-6, the wheel frame (1) is connected on the mounting bracket (6) through the connecting shaft (2), and the wheel frame (1) can rotate around the axis of the connecting shaft (2); Drive assembly, the drive assembly is drivingly connected with the connecting shaft (2).

8. The light filtering device of claim 7, wherein, The drive assembly includes drive motor (7) and synchronous belt (8), the drive motor (7) is drivingly connected with the connecting shaft (2) through the corresponding synchronous belt (8).

9. The light filtering device of claim 8, wherein, It also includes mounting base (9), the mounting bracket (6) and the drive motor (7) are all installed on the mounting base (9).

10. The light filtering device of claim 9, wherein, The mounting base (9) bottom is provided with high damping rubber pad (10).

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