A buckle type filter switching device

Abstract

The utility model discloses a buckle formula quick assembly and disassembly's optical filter switching device belongs to optical equipment technical field, aims at providing a kind of optical filter switching device with compact structure, it is convenient to assemble, it is simple to maintain, positioning accurate. The device includes detachably connected drive module and sliding module;Sliding module contains main frame, transmission connecting rod and optical filter carrier, and main frame is equipped with arc-shaped guide rail and limiting rib to guide optical filter carrier linear sliding;Drive module contains electromagnetic drive arm, permanent magnet and drive coil, and swing arm rotation is driven by electromagnetic force, and drive module is quickly connected with main frame by buckle, and its output shaft is hinged with transmission connecting rod, to swing into the accurate linear displacement of optical filter, realize optical path switching;Main frame back is equipped with the accommodating groove and screw hole for directly installing positioning infrared imaging module. The utility model is applicable to the imaging equipment needing day and night optical filtering switching.

Description

Technical Field

[0001] This utility model relates to the field of optical equipment technology, and more specifically to a snap-on quick-release filter switching device. Background Technology

[0002] In existing surveillance camera technology, to achieve day and night monitoring capabilities, a front-mounted filter switcher (IR-CUT) is typically installed in front of the camera lens. This filters out excess infrared light in the daytime environment to ensure color accuracy, while removing the filter at night to allow infrared light to pass through and enhance night vision. However, currently available filter switching devices have the following shortcomings:

[0003] I. Size Limitations: Due to design limitations, existing pre-filter switchers often encapsulate all their components (including the drive motor and filter sliding parts) within a large housing, laid flat on a single surface. This results in a significant increase in overall size, particularly in the cross-sectional direction. This drawback is a serious constraint for imaging systems seeking compact designs, large apertures, and thin profiles to facilitate installation and maintenance.

[0004] II. Assembly Complexity: Current filter switching devices require an additional secondary adapter bracket for installation and adaptation when combined with infrared imaging modules. This additional adapter not only increases the overall complexity of the device, but installation errors may also reduce the coaxiality of the filter and imaging module, thereby affecting the final imaging quality of the entire device.

[0005] 3. Inconvenient maintenance: The packaging method of traditional filter switchers makes it difficult to maintain or replace parts later, especially for frequently used parts such as filters and drive mechanisms. The maintenance process may be time-consuming and labor-intensive, and may even require the intervention of professional tools.

[0006] IV. Versatility and Compatibility: The diversity of modern optical systems demands greater versatility and compatibility from filter switching devices to facilitate seamless integration with other types of imaging modules or equipment. However, existing technologies often fall short in this regard, especially in applications where the lens and imaging device are close together.

[0007] To address the problems existing in the prior art, this utility model proposes an improved filter switching device, aiming to provide a thinner, easier-to-assemble, and easier-to-maintain solution, while optimizing the coaxiality between the filter and the imaging module to improve the final imaging quality. Utility Model Content

[0008] Based on the above analysis, this utility model aims to provide a snap-on quick-release filter switching device to solve the problems of existing front filter switchers, such as excessive size, the need for additional secondary adapter brackets when combined with infrared imaging modules, inconvenient maintenance, and insufficient versatility and compatibility.

[0009] The objective of this utility model is mainly achieved through the following technical solutions:

[0010] This utility model provides a snap-on quick-release filter switching device, characterized in that it includes a drive module and a sliding module;

[0011] The sliding module includes a main frame, a transmission link, a filter carrier, and a filter. The filter is fixed on the filter carrier, and a locking part is provided on the front side of the main frame. The drive module includes a locking end cap, which is provided with a module hook. The drive module and the sliding module are detachably connected to the locking part through the module hook.

[0012] The reverse side of the main frame is provided with a module receiving slot, which is used to accommodate an infrared imaging module. The module receiving slot is staggered from the engaging part, and their projections on the plane parallel to the main frame do not coincide.

[0013] Furthermore, the front of the main frame is also provided with an arc-shaped guide rail, a pivot shaft, an upper limit rib, and a lower limit rib; the transmission link cooperates with the pivot shaft through a pivot hole provided on the transmission link, and can move along the arc-shaped guide rail in an arc-shaped trajectory; the filter carrier is linked with the transmission link and can slide left and right along the guide groove defined by the upper limit rib and the lower limit rib.

[0014] Furthermore, the drive module includes an electromagnetic drive arm and an electromagnetic drive unit that drives the electromagnetic drive arm to swing. The electromagnetic drive arm drives the transmission link to move through the drive hole of the transmission link via an output shaft provided on the electromagnetic drive arm.

[0015] Furthermore, the filter carrier is provided with multiple sliding protrusions symmetrically on its upper and lower sides, and the sliding protrusions are embedded in the guide groove.

[0016] Furthermore, the sliding module also includes a connecting rod pressure plate, which has a pressure plate positioning hole and a locking seat. The main frame also has a positioning shaft and a locking buckle. The axial fixation of the transmission connecting rod is achieved by assembling the pressure plate with the positioning shaft through the pressure plate positioning hole and by engaging the locking seat with the locking buckle.

[0017] Furthermore, a linkage post is provided at the end of the transmission link away from the pivot hole, and the linkage post engages with an elongated hole on the filter carrier.

[0018] Furthermore, the sliding module also includes a sealing plate, which is fixedly connected to the main frame.

[0019] Furthermore, the electromagnetic drive unit includes a coil frame, a drive coil wound thereon, and a permanent magnet fixed to the electromagnetic drive arm.

[0020] Furthermore, the coil frame is also provided with a positioning magnet that limits the swing position of the electromagnetic drive arm.

[0021] Furthermore, the drive module also includes a housing and a circuit board with connectors, the housing enclosing the coil frame, and the circuit board with connectors being welded and fixed to the housing.

[0022] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0023] 1. Achieving a thinner and lighter device: By separating the drive module and sliding module and staggering the imaging module and drive module, the overall space utilization is optimized, the thickness of the device in the vertical direction of the optical axis is reduced, and the device meets the requirements of compact imaging systems for large aperture and ultra-thin appearance, which facilitates equipment integration and installation.

[0024] 2. Simplified Assembly Process: The main frame integrates a module receiving slot and assembly threaded holes, allowing for direct and precise alignment and installation with standard infrared imaging modules, completely eliminating the need for additional adapter brackets. The precision-designed receiving slot effectively reduces accumulated assembly errors and significantly improves the coaxiality of the filter optical center and the imaging module optical axis, ensuring the stability and consistency of the overall imaging quality.

[0025] 3. Enhanced Maintenance Ease: Adopting a modular design, the drive module and sliding module are connected via easily detachable structures such as clips and screws. Replacement and repair of easily damaged or cleaning-required components such as filters and drive coils do not require specialized tools or complex disassembly, significantly reducing the time cost and technical barrier to later maintenance.

[0026] 4. Ensuring Precise and Stable Movement: A precision guiding system composed of an arc-shaped guide rail and upper and lower limit ribs, combined with the precise positioning of the electromagnetic drive arm by a positioning magnet, ensures the smoothness and repeatability of the filter carrier's sliding motion. Simultaneously, the sealing structure formed by the sealing plate and the module receiving groove effectively suppresses stray light interference, further optimizing the imaging effect in day and night modes.

[0027] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0028] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0029] Figure 1 This is a schematic diagram of the overall structure of the snap-on quick-release filter switching device of this utility model.

[0030] Figure 2 This is a front structural diagram of the main frame of this utility model;

[0031] Figure 3 This is a schematic diagram of the reverse side structure of the main frame of this utility model;

[0032] Figure 4 This is a schematic diagram of the transmission connecting rod of this utility model;

[0033] Figure 5 This is a schematic diagram of the connecting rod pressure plate of this utility model;

[0034] Figure 6 This is a schematic diagram of the structure of the filter carrier of this utility model;

[0035] Figure 7 This is a schematic diagram of the filter carrier of this utility model in the "no filter" state;

[0036] Figure 8 This is a schematic diagram of the filter carrier of this utility model in the "with filter" state;

[0037] Figure 9 This is an exploded view of the drive module of this utility model;

[0038] Figure 10 This is a schematic diagram showing the assembly relationship between the drive module and the sliding module of this utility model;

[0039] Figure 11 This is an assembly diagram of the present invention applied to a third-party infrared imaging module.

[0040] Figure Labels

[0041] 100-Drive module; 110-Snap-fit ​​end cap; 111-Module hook; 120-Electromagnetic drive arm; 121-Output shaft; 122-Permanent magnet mounting post; 123-Center through hole; 130-Permanent magnet; 140-Coil frame; 141-Magnet mounting cavity; 150-Drive coil; 160-Housing; 170-Circuit board with connector; 180-Center rotating shaft; 190-Positioning magnet; 200-Sliding module; 210-Main frame; 2101-Latch; 2102-Positioning shaft; 2103-Arc-shaped guide rail; 2104- Pivot shaft; 2105-Through hole; 2106-Upper limit rib; 2107-Lower limit rib; 2108-Engine; 2109-Light transmission hole; 2110-Module assembly screw hole; 2111-Module receiving slot; 220-Transmission connecting rod; 221-Pivot hole; 222-Drive hole; 223-Linkage column; 230-Connecting rod pressure plate; 231-Pressure plate positioning hole; 232-Lock seat; 240-Filter carrier; 241-Oblong hole; 242-Sliding protrusion; 243-Filter mounting slot; 250-Filter; 260-Sealing guard plate. Detailed Implementation

[0042] The preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the present invention to illustrate the principle of the present invention.

[0043] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and, together with the embodiments of the present invention, serve to illustrate the principles of the present invention.

[0044] like Figure 1 As shown, the snap-on quick-release filter switching device provided by this utility model includes a drive module 100 and a sliding module 200. The drive module 100 serves as a power source, driving the sliding module 200 to perform the reciprocating sliding switching action of the filter 250.

[0045] The sliding module 200 includes a main frame 210, a transmission link 220, a link pressure plate 230, a filter carrier 240, a filter 250, and a sealing plate 260. The transmission link 220 can swing in an arc-shaped manner along the arc-shaped guide rail 2103 on the main frame 210, thereby driving the filter carrier 240 to slide left and right within the guide groove formed between the upper limit rib 2106 and the lower limit rib 2107. The sealing plate 260 covers the entire sliding module 200, serving to prevent dust and impacts and enhance overall rigidity.

[0046] like Figure 2As shown, the main frame 210 is the supporting body of the sliding module 200. Its front side is equipped with a latch 2101, a positioning shaft 2102, an arc-shaped guide rail 2103, a pivot shaft 2104, a through-shaft hole 2105, an upper limit rib 2106, a lower limit rib 2107, a locking part 2108, and a light-transmitting hole 2109. These structures together enable the installation, guidance, and limiting of the transmission connecting rod 220, as well as its rapid docking with the drive module 100.

[0047] like Figure 3 As shown, the reverse side of the main frame 210 is provided with module mounting screw holes 2110 and module receiving slots 2111. The module mounting screw holes 2110 are used to directly fasten the third-party infrared imaging module to the main frame 210 with screws. The dimensions of the module receiving slot 2111 are precisely designed according to the shape of the standard infrared imaging module, which can embed and wrap the module part, thereby achieving precise positioning, effectively reducing installation tolerances, and improving optical path coaxiality. This design directly solves the problems mentioned in the background art of requiring additional adapter brackets and complex assembly. The module mounting screw holes 2110 and module receiving slots 2111 are staggered from the engaging part 2108 on the front side, and their projections on the surface parallel to the main frame 210 do not coincide. In this way, the third-party infrared forming module and the driving module 100 can be installed in a staggered manner, which can also greatly reduce the thickness of the entire device in the direction perpendicular to the optical axis and optimize the overall space occupation.

[0048] like Figure 4 As shown, the transmission link 220 is roughly elongated, with a pivot hole 221 at one end, a linkage post 223 at the other end, and a drive hole 222 near the middle. Its function is to convert the rotational motion output by the drive module 100 into linear motion of the filter carrier 240. The pivot hole 221 engages with the pivot shaft 2104 on the main frame 210, allowing the transmission link 220 to swing about this shaft along the arc-shaped guide rail 2103.

[0049] like Figure 5 As shown, the connecting rod pressure plate 230 is used to axially press and fix the transmission connecting rod 220 onto the main frame 210 to prevent it from coming off. The connecting rod pressure plate 230 is provided with a pressure plate positioning hole 231 and a locking seat 232. During assembly, the pressure plate positioning hole 231 is fitted into the positioning shaft 2102 of the main frame 210, and at the same time, the locking seat 232 engages with the locking buckle 2101 on the main frame 210, thereby completing the fixation.

[0050] like Figure 6As shown, the filter carrier 240 is used to support and fix the filter 250. It has an elongated hole 241, multiple sliding protrusions 242, and a filter mounting groove 243. The sliding protrusions 242, symmetrically distributed on the upper and lower edges, are embedded in the guide grooves formed by the upper and lower limiting ribs, reducing friction and maintaining stability during sliding. The filter 250 is fixed to the filter mounting groove 243 by optical adhesive. The linkage post 223 of the transmission linkage 220 is inserted into the elongated hole 241 of the filter carrier 240, converting the oscillation into linear sliding.

[0051] Figure 7 The filter carrier 240 is shown in a "no filter" state (i.e., night vision mode). At this time, the filter 250 is completely removed from the light-transmitting aperture 2109 area, allowing light to pass through directly.

[0052] Figure 8 The filter carrier 240 is shown in the "filter on" state (i.e., daytime mode). At this time, the filter 250 is precisely moved in front of the light-transmitting aperture 2109 to filter the incident light.

[0053] like Figure 9 As shown, the drive module 100 mainly includes a snap-fit ​​end cap 110, an electromagnetic drive arm 120, an electromagnetic drive unit, a housing 160, a circuit board with connectors 170, and a central rotating shaft 180. The electromagnetic drive unit includes a coil frame 140, a drive coil 150 wound on it, and a permanent magnet 130 fixed to the electromagnetic drive arm 120; the coil frame 140 also has two positioning magnets 190 that define the swing position of the electromagnetic drive arm 120. The electromagnetic drive arm 120 has an output shaft 121, a permanent magnet mounting post 122, and a central through hole 123. During assembly, the permanent magnet 130 is press-fitted into the permanent magnet mounting post 122, and then this assembly is installed into the central cavity of the coil frame 140. The central rotating shaft 180 passes through the central through hole 123 and is pressed and positioned by the snap-fit ​​end cap 110. The drive coil 150 is wound on the coil frame 140, and two positioning magnets 190 are embedded in the magnet mounting cavities 141 on both sides of the frame to limit the two extreme positions of the electromagnetic drive arm 120 swing (corresponding to the two states of the filter). Finally, the housing 160 is assembled and the circuit board 170 with connector is soldered to form a complete drive module 100.

[0054] like Figure 10As shown, the assembly relationship between the drive module 100 and the sliding module 200 is as follows: the drive module 100 is fastened to the engaging portion 2108 on the front of the main frame 210 via the module hook 111 on its snap-fit ​​end cap 110. Simultaneously, the output shaft 121 at the front end of the electromagnetic drive arm 120 passes sequentially through the shaft hole 2105 of the main frame 210 and the drive hole 222 of the transmission connecting rod 220. This modular, screwless snap-fit ​​connection method greatly simplifies the assembly and disassembly process, solves the problem of inconvenient maintenance, and the stacked structure achieves a slimmer and lighter device.

[0055] The drive module 100 is designed independently of the sliding module 200, which reduces the thickness of the sliding module 200 in the direction perpendicular to the optical axis. This, in turn, reduces the thickness of the entire filter switching device in the direction perpendicular to the optical axis, achieving a thinner and lighter filter switching device. This solves the problem of the existing device being too large, optimizes the overall space occupation, and adapts to the requirements of compact imaging systems for thinness and large light transmission aperture, which is beneficial for equipment installation and deployment.

[0056] like Figure 11 The diagram shows the integration of this device with a third-party infrared imaging module. Because the module mounting screw holes 2110 and module receiving slots 2111 are staggered from the front engaging portion 2108, their projections on the plane parallel to the main frame 210 do not coincide. This allows the third-party infrared forming module and drive module 100 to be installed in a staggered manner, which greatly reduces the thickness of the entire device in the direction perpendicular to the optical axis, optimizing the overall space occupancy.

[0057] It is worth mentioning that, since the drive module 100 and the sliding module 200 are designed independently, in practical applications, only the sliding module 200 can be used to drive the transmission link 220 in other ways (such as manually), which enhances the flexibility of the device.

[0058] Working principle: When the power supply is turned on to the circuit board 170 with connector of the drive module 100 and a control signal is applied, the drive coil 150 is energized to generate a magnetic field. This magnetic field interacts with the magnetic fields of the permanent magnet 130 and the positioning magnet 190, driving the electromagnetic drive arm 120 to swing from one extreme position to another around the central axis 180. The output shaft 121 of the electromagnetic drive arm 120 drives the transmission link 220 to swing around the pivot axis 2104. The swing of the transmission link 220 is converted into the precise linear movement of the filter carrier 240 along the guide groove through the engagement of the linkage post 223 at its end with the elongated hole 241 on the filter carrier 240, thereby realizing the movement of the filter 250 in front of the light-transmitting hole 2109 and completing the switching of day and night modes.

[0059] Upper limit rib 2106 and lower limit rib 2107 ensure that the filter carrier 240 slides along a strictly defined path without wobbling. The sealing plate 260 further ensures the cleanliness and stability of the sliding area. The module receiving slot 2111 on the back of the main frame 210 effectively shields side stray light and improves the image signal-to-noise ratio when the imaging module is installed.

[0060] In summary, this utility model, through its innovative separate design of the drive module and sliding module, precise guide and limit mechanism, and convenient snap-fit ​​connection method, successfully achieves a thinner and lighter filter switching device, simplified assembly, convenient maintenance, and good versatility, effectively overcoming many shortcomings of the prior art.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A snap-on quick-release filter switching device, characterized in that, It includes a drive module (100) and a sliding module (200); The sliding module (200) includes a main frame (210), a transmission link (220), a filter carrier (240), and a filter (250). The filter (250) is fixed on the filter carrier (240). A locking part (2108) is provided on the front side of the main frame (210). The drive module (100) includes a locking end cap (110). The locking end cap (110) is provided with a module hook (111). The drive module (100) and the sliding module (200) are detachably connected to the locking part (2108) through the module hook (111). The reverse side of the main frame (210) is provided with a module receiving groove (2111), which is used to receive an infrared imaging module. The module receiving groove (2111) is staggered from the engaging part (2108), and their projections on the plane parallel to the main frame (210) do not coincide.

2. The snap-on quick-release filter switching device according to claim 1, characterized in that, The main frame (210) is also provided with an arc-shaped guide rail (2103), a pivot shaft (2104), an upper limit rib (2106), and a lower limit rib (2107) on its front side; the transmission link (220) cooperates with the pivot shaft (2104) through the pivot hole (221) provided on the transmission link (220), and can move along the arc-shaped guide rail (2103) in an arc-shaped trajectory; the filter carrier (240) is linked with the transmission link (220) and can slide left and right along the guide groove defined by the upper limit rib (2106) and the lower limit rib (2107).

3. The snap-on quick-release filter switching device according to claim 1, characterized in that, The drive module (100) includes an electromagnetic drive arm (120) and an electromagnetic drive unit that drives the electromagnetic drive arm (120) to swing. The output shaft (121) provided on the electromagnetic drive arm (120) is connected to the drive hole (222) of the transmission link (220), and the electromagnetic drive arm drives the transmission link (220) to move.

4. The snap-on quick-release filter switching device according to claim 2, characterized in that, The filter carrier (240) has a plurality of sliding protrusions (242) symmetrically arranged on its upper and lower sides, and the sliding protrusions (242) are embedded in the guide groove.

5. The snap-on quick-release filter switching device according to claim 1, characterized in that, The sliding module (200) also includes a connecting rod pressure plate (230), which is provided with a pressure plate positioning hole (231) and a locking seat (232). The main frame (210) is also provided with a positioning shaft (2102) and a locking buckle (2101) on the front side. The axial fixation of the transmission connecting rod (220) is achieved by assembling the pressure plate positioning hole (231) with the positioning shaft (2102) and by engaging the locking seat (232) with the locking buckle (2101).

6. The snap-on quick-release filter switching device according to claim 2, characterized in that, The transmission link (220) has a linkage post (223) at one end away from the pivot hole (221), and the linkage post (223) engages with the elongated hole (241) on the filter carrier (240).

7. The snap-on quick-release filter switching device according to claim 1, characterized in that, The sliding module (200) also includes a sealing plate (260), which is fixedly connected to the main frame (210).

8. The snap-on quick-release filter switching device according to claim 3, characterized in that, The electromagnetic drive unit includes a coil frame (140), a drive coil (150) wound thereon, and a permanent magnet (130) fixed to the electromagnetic drive arm (120).

9. The snap-on quick-release filter switching device according to claim 8, characterized in that, The coil frame (140) is also provided with a positioning magnet (190) that limits the swing position of the electromagnetic drive arm (120).

10. The snap-on quick-release filter switching device according to claim 9, characterized in that, The drive module (100) also includes a housing (160) and a circuit board (170) with a connector. The housing (160) encloses the coil frame (140), and the circuit board (170) with the connector is welded and fixed to the housing (160).

Images