Infrared lens shutter with reinforced anti-deformation and anti-skid

Abstract

The application discloses a connecting structure, in particular to an infrared lens shutter which is strengthened against deformation and skidding. The light shielding blade and the driving mechanism are connected through a split thread connecting structure. The light shielding blade comprises a light shielding baffle, and the light shielding baffle is provided with a light shielding baffle supporting arm. The light shielding blade is made of an insert injection molding process. The light shielding baffle is provided with a deformation prevention reinforcing rib. The permanent magnet rotating part of the driving motor assembly is provided with an anti-skid limiting groove which prevents the driving arm from skidding in the driving arm connecting installation hole. The application adds the structure of the deformation prevention reinforcing rib on the light shielding blade. The annularly arranged rib structure strengthens the anti-impact stress of the light shielding blade and improves the anti-impact and bending resistance of the light shielding blade. The light shielding blade embeds the light shielding baffle supporting arm as an insert on the deformation prevention driving connecting arm, thereby strengthening the connecting strength between the two. The anti-skid limiting groove is added on the permanent magnet rotating part, thereby avoiding the skidding of the connecting structure of the driving arm.

Description

[0001] This application is a divisional application. The original application has the application number 201810532263.5, the application date is May 29, 2018, and the invention title is "A split-type threaded connection structure and an infrared lens shutter". Technical Field

[0002] This invention discloses a connection structure, particularly an infrared lens shutter that is enhanced to prevent deformation and slippage. Background Technology

[0003] In existing technologies, due to the limited thickness of the light-blocking blades, infrared lens shutter assemblies are generally fixed to the shutter drive mechanism by welding or applying adhesive. This method of fixing the light-blocking blades results in adhesive overflow during production, and after a certain period of use, the blades are prone to detaching after actuation due to aging of the connection points, leading to problems such as poor operation, increased energy consumption, or even operational failure.

[0004] In the prior art, the connection structure of the drive arm responsible for rotation in the infrared lens shutter assembly is relatively simple, and the contact area of ​​the limiting structure is small. During high-frequency swinging and impact, the connection structure of the drive arm is prone to slippage. Moreover, due to the limited thickness of the light-shielding blade, the light-shielding blade will be affected by the impact force of multiple swinging movements during high-frequency use. High-frequency swinging and impact may cause the light-shielding blade to slowly deform, eventually forming a curved surface. In severe cases, the swinging and impact may even cause the light-shielding blade to be thrown out and detached from the drive connecting arm.

[0005] To address the above shortcomings, we need to develop an infrared lens shutter that is enhanced to prevent deformation and slippage, thus meeting the needs of a wide range of users. Summary of the Invention

[0006] To address the aforementioned problems in the prior art, such as slippage in the drive arm connection structure, slow deformation of the shading blades due to impact, and the easy ejection and detachment of the shading blades from the drive connecting arm, the technical solution adopted by this invention is as follows:

[0007] An infrared lens shutter with enhanced anti-deformation and anti-slip properties is provided. The shutter's light-shielding blades and drive mechanism are connected by a split threaded connection structure. The drive mechanism includes a drive arm and a drive motor assembly. The light-shielding blades are provided with a connecting hole. The inner wall of the threaded connection half-hole of the connecting hole is engaged with the external thread of a screw. The drive arm is provided with a connecting protrusion. The connecting protrusion extends into the locking half-hole of the connecting hole, and one side of it is engaged with the external thread of a screw.

[0008] The split threaded connection structure includes a first connector and a second connector that are connected to each other by screws. The first connector has a connecting hole on which a portion of its inner wall is engaged with the external thread of the screw. The second connector has a connecting protrusion that extends into the connecting hole and is engaged with the external thread of the screw on one side.

[0009] The light-shielding blade includes a light-shielding plate made of metal for blocking light. The light-shielding plate is provided with a light-shielding plate support arm for supporting the light-shielding plate. A plastic anti-deformation drive connecting arm is connected to the light-shielding plate support arm. The connecting hole is provided on the anti-deformation drive connecting arm.

[0010] The shutter base of the infrared shutter is provided with an impact buffer mechanism, and the anti-deformation drive connecting arm is provided with an anti-impact deformation mechanism. The anti-impact deformation mechanism and the impact buffer mechanism are configured in cooperation.

[0011] The impact buffer mechanism includes an impact buffer pad and a buffer pad mounting bracket. The buffer pad mounting bracket is set on the shutter base, and the impact buffer pad is installed inside the buffer pad mounting bracket. The anti-impact deformation mechanism is an anti-impact protrusion set on the drive connecting arm to prevent the light-shielding blade from being deformed by impact.

[0012] The light-shielding baffle is provided with anti-deformation reinforcing ribs, which are located in the middle of the light-shielding baffle. The reinforcing ribs are annular and have an opening. One end of the opening extends toward the light-shielding baffle support arm and is located on the light-shielding baffle support arm.

[0013] The light-shielding blade is made using an insert injection molding process, the light-shielding baffle is an insert, and the light-shielding baffle support arm is embedded in the anti-deformation drive connecting arm;

[0014] The permanent magnet rotating component of the drive motor assembly is provided with an anti-slip limiting groove to prevent the drive arm from slipping in the drive arm connection mounting hole. The anti-slip limiting groove is located on one bottom surface of the permanent magnet rotating component, and the drive arm is installed in the anti-slip limiting groove.

[0015] Furthermore, in some embodiments, the first connector is provided with a connecting boss, and the connecting hole is disposed within the connecting boss.

[0016] Furthermore, in some embodiments, the connecting hole includes a threaded connecting half-hole for connection with the external thread of a screw and a locking half-hole for insertion of the connecting protrusion.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. This invention adds a deformation-resistant reinforcing rib structure to the light-shielding blades. The annular arrangement of these ribs significantly enhances the impact resistance of the light-shielding blades, improving their impact and bending resistance, and extending their service life. The light-shielding blades are manufactured using an insert injection molding process, embedding the light-shielding support arm into the deformation-resistant drive connecting arm. This strengthens the connection between the support arm and the drive connecting arm, preventing the light-shielding blades from loosening under high-frequency oscillation impacts. An anti-slip limiting groove is added to the permanent magnet rotating component to prevent the drive arm from slipping in the mounting hole. This groove contacts the drive arm from three sides (left, right, and bottom), increasing the contact area and preventing slippage in the drive arm's connection structure. This improves the clamping stability of the permanent magnet rotating component and enhances the overall structural stability.

[0019] 2. The split threaded connection structure of the present invention uses screw connection, which can avoid the problem of falling off due to plastic aging that occurs in welding or glue fixing methods; secondly, the use of split threads reduces the thickness of the threaded connector while increasing the effective length of the threaded connection; at the same time, since the threads are respectively set on two connectors, it is not necessary to open screw holes on both connectors. When used on some small workpieces such as infrared shutter parts, it can reduce the probability of damage to the connection parts of the parts.

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the disassembled structure of the light-shielding blade in an embodiment of the infrared lens shutter of the present invention for preventing blade impact deformation;

[0022] Figure 2 This is a three-dimensional structural diagram of the shutter base of an embodiment of the infrared lens shutter for preventing blade impact deformation according to the present invention;

[0023] Figure 3 This is a three-dimensional structural diagram of the shutter base of an embodiment of the infrared lens shutter for preventing blade impact deformation according to the present invention;

[0024] Figure 4 This is a schematic diagram of the disassembled structure of an embodiment of the infrared lens shutter for preventing blade impact deformation according to the present invention;

[0025] Figure 5 This is a three-dimensional structural diagram of the shutter base of an embodiment of the infrared lens shutter for preventing blade impact deformation according to the present invention;

[0026] Figure 6 This is a three-dimensional structural diagram of the permanent magnet rotating component in an embodiment of the infrared lens shutter of the present invention for preventing blade impact deformation;

[0027] In the diagram, 1. Shutter base; 11. Buffer pad; 111. Door opening impact buffer pad; 112. Door closing impact buffer pad; 12. Buffer pad bracket; 121. Door opening buffer pad bracket; 122. Door closing buffer pad bracket; 2. Drive motor assembly; 21. Drive motor housing; 22. Drive coil; 23. Permanent magnet rotating component; 231. Drive arm connection mounting hole; 232. Anti-slip limiting groove; 24. Drive arm; 241. 242. Fixed shaft mounting hole, 25. Connecting protrusion, 26. Coil base, 27. Drive electrical appliance mounting end cover, 3. Fixed shaft, 3. Light-shielding blade, 31. Light-shielding baffle, 311. Light-shielding baffle support arm, 32. Anti-deformation drive connecting arm, 321. Connecting hole, 3211. Threaded connection half hole, 3212. Locking half hole, 322. Connecting boss, 323. Limiting protrusion, 3231. Door closing limit protrusion, 3232. Door opening limit protrusion. Detailed Implementation

[0028] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0029] This embodiment is a preferred embodiment of the present invention. All other embodiments that are the same as or similar to this embodiment in principle and basic structure are within the protection scope of the present invention.

[0030] An embodiment of the infrared lens shutter employing the split-type threaded connection structure of the present invention is shown below. Figure 1-6As shown, the device includes a drive arm 24 and a light-shielding blade 3 connected by screws. The light-shielding blade 3 has a connecting boss 322, and a drive arm connecting hole 321 is located within the connecting boss 322. The drive arm connecting hole 321 includes a threaded connecting half-hole 3211 and a locking half-hole 3212. The threaded connecting half-hole 3211 has an internal thread on its inner wall for connection with the external thread of a screw, and the locking half-hole 3212 is used to install the connecting protrusion 242. The connecting protrusion 242 is located at the connection point between the drive arm 24 and the light-shielding blade 3. The connecting protrusion 242 extends into the drive arm connecting hole 321, and one side of it engages with the external thread of a screw. The connecting protrusion 242 is inserted into the locking half-hole 3212 of the connecting hole 321, so that the internal thread on the connecting protrusion 242 and the internal thread on the inner wall of the threaded connecting half-hole 3211 of the connecting hole 321 form a screw hole that fits. The screw is installed into the screw hole to fix the connecting protrusion 242 and the connecting hole 321 together, and the drive arm 24 is connected to the light-shielding blade 3. This method of connecting the light-shielding blade 3 and the drive arm 24 can, firstly, avoid the situation where the drive arm 24 is very thin and directly opening a screw hole at its top could easily cause the drive arm 24 to burst during use, causing the shutter to fail; secondly, the use of a split thread reduces the thickness of the threaded connector while increasing the effective length of the threaded connection, making the screw installation more secure; finally, it avoids the problems of glue overflow and failure caused by aging of the glued part that may occur when using the glue dispensing method to connect the light-shielding blade 3 and the drive arm 24 in the prior art. To further strengthen the connection between the light-shielding blade 3 and the drive arm 24, prevent the light-shielding blade 3 from deforming, and extend the service life of the shutter, the light-shielding blade 3 is provided with a connecting boss 322 to prevent deformation of the light-shielding blade around the connecting hole. In this embodiment, the light-shielding blade 3 is provided with a connecting hole 321, so the connecting boss 322 is provided on the anti-deformation drive connecting arm 32. The connecting boss 322 is a boss provided along the edge of the connecting hole 321 with the connecting hole 321 as the center.

[0031] The light-shielding blade 3 includes a metal light-shielding plate 31 for blocking light. The light-shielding plate 31 has a light-shielding plate support arm 311 for supporting it, and a plastic anti-deformation drive connecting arm 32 is connected to the light-shielding plate support arm 311. This design of the light-shielding blade transfers the force during shutter action to the stronger anti-deformation drive connecting arm 32, preventing deformation of the light-shielding blade 3 after long-term use. To make the connection between the light-shielding plate 31 and the anti-deformation drive connecting arm 32 more secure, this invention uses an insert injection molding process to connect the two components together, with the light-shielding plate 31 serving as an insert. During injection molding, the light-shielding plate 31 is placed in a mold, and the material used to manufacture the anti-deformation drive connecting arm 32 is injected, causing the light-shielding plate support arm 311 to be embedded inside the anti-deformation drive connecting arm 32. The light-shielding plate support arm 311 also has elliptical fixing holes, which further strengthen the connection of the anti-deformation drive connecting arm 32.

[0032] The infrared lens shutter of this embodiment also includes a shutter base 1, which has a series of mounting positions for mounting small auxiliary parts such as wires. A drive motor assembly 2 for driving the opening and closing of the shutter is also mounted on the shutter base 1. The drive motor assembly 2 includes a drive motor housing 21, which is a cylindrical iron piece. A drive coil 22 is installed inside the drive motor housing 2. In this embodiment, the drive coil 22 is made of enameled wire wound around the coil base 25 and the drive motor mounting end cover 26. In actual production, other suitable types of coils can also be used. A permanent magnet rotating component 23 is installed inside the drive coil 22. The permanent magnet rotating component 23 is a cylindrical permanent magnet with a drive arm connection mounting hole 231 in the middle. The drive arm connection mounting hole 231 is a through hole, and a drive arm 24 is installed inside the hole. The drive arm 24 includes a drive arm body installed inside the drive arm connection mounting hole 231 and a drive arm arm extending outside the drive arm connection mounting hole 231. In this embodiment, the drive arm 24 is shaped like a tuning fork, and the arm body is L-shaped, with two arms symmetrically arranged on both sides of the same end of the drive arm body. In actual production, the drive arm 24 can be modified to other shapes and structures for ease of use. The permanent magnet rotating component 23 is equipped with an anti-slip limiting structure, which is an anti-slip limiting groove 232 on the bottom surface of the permanent magnet rotating component 23. The horizontal part of the L-shaped drive arm body is installed in the anti-slip limiting groove 232, ensuring that the permanent magnet rotating component 23 drives the drive arm 24 when it rotates. The vertical part of the L-shaped drive arm body is connected to the shutter's light-blocking blades 3. When the drive arm 24 is driven by the permanent magnet rotating component 23, it also drives the light-blocking blades 3 to open and close. To prevent the permanent magnet rotating component 23 and the drive arm 24 from moving arbitrarily when rotating inside the coil base 25, the main body of the drive arm 24 is provided with a fixed shaft mounting hole 241. The fixed shaft 27 is installed in the fixed shaft mounting hole 241 and inserted into the coil base 25. The permanent magnet rotating component 23 and the drive arm 24 rotate around the fixed shaft 27. In production applications, to avoid installation errors and reduce installation steps, the drive motor mounting end cover 26 can also be integrally formed onto the shutter base 1. During installation, first install the permanent magnet rotating component 23 into the coil base 25, then install the coil base 25 onto the integrally formed drive motor mounting end cover 26, then place the assembled components together on the winding machine to install the drive coil 22, and finally put on the drive motor housing 21.

[0033] To prevent direct impact between the light-blocking blades and the shutter base, and to reduce the force exerted on the light-blocking blades during shutter opening and closing, this invention provides a buffer pad mounting bracket 12 on the shutter base 1. The buffer pad mounting bracket 12 contains a buffer pad 11 made of buffering material. Since the shutter needs to perform both opening and closing actions, the anti-deformation drive connecting arm 32 will be subjected to two impact forces from different directions. Therefore, two buffer pad mounting brackets 12 are provided for opening and closing: an opening buffer pad bracket 121 for opening and a closing buffer pad bracket 122 for closing. The opening buffer pad bracket 121 is located on the shutter base 1 near the drive motor assembly 2, and contains an opening impact buffer pad 111. The closing buffer pad bracket 122 is located on the shutter base 1 away from the drive motor assembly 2, and contains a closing impact buffer pad 112. Corresponding to the impact buffer mechanism on the shutter base 1, the drive connecting arm 32 is provided with an anti-impact protrusion 323. The anti-impact protrusion 323 also includes an opening anti-impact protrusion 3232 and a closing anti-impact protrusion 3231 for the opening and closing actions. In this embodiment, the opening anti-impact protrusion 3232 corresponds to the opening buffer pad bracket 121 on the shutter base 1, and is located on the edge of the drive connecting arm 32 opposite to the shutter base 1, protruding towards the shutter base 1 and close to the drive motor assembly 2. The closing anti-impact protrusion 3231 corresponds to the closing buffer pad bracket 122 on the shutter base 1, and is located on the edge of the drive connecting arm 32, away from the drive motor assembly 2, and is a protrusion on the side of the drive connecting arm 32. Because the shutter opening and closing actions are very frequent, if the same impact buffer mechanism is used for both opening and closing actions, the buffer mechanism is easily damaged, and the drive connecting arm 32 is also prone to deformation due to long-term stress on the same point. Therefore, this embodiment provides corresponding buffer mechanisms for different actions. During the door opening action, the door opening anti-collision protrusion 3232 collides with the door opening impact buffer pad 111 installed in the door opening buffer pad bracket 121. The door opening impact buffer pad 111 effectively buffers the impact force and reduces the force on the drive connecting arm 32.During the closing action, the door-closing anti-collision protrusion 3231 impacts the door-closing impact buffer pad 112 installed in the door-closing buffer pad bracket 122. The door-closing impact buffer pad 112 buffers the impact force, reducing the force on the drive connecting arm 32 during the action. During installation, first insert the connecting protrusion 242 on the drive arm 24 into the locking half hole 3212 of the connecting hole 321, and then install the screw into the screw hole to fix the connecting protrusion 242 and the connecting hole 321 together. The drive arm 24 and the light-blocking blade 3 can then be firmly connected together without the need for adhesive. When in use, the wires installed on the shutter base 1 are connected to the drive motor assembly 2. When the drive motor assembly 2 is powered on, the permanent magnet rotating part 23 starts to rotate under the magnetic field of the drive coil 22, driving the drive arm 24 installed in the drive arm connecting mounting hole 231 to rotate. The limiting groove 232 locks the arm position of the drive arm 24 to ensure that the drive arm 24 will not slip during rotation. The drive arm 24 drives the light-blocking blades 3 to switch between open and closed states, switching the light entering the camera. The connecting protrusion 242 on the drive arm 24 is strong enough to prevent the drive arm 24 from breaking during use and causing the shutter to malfunction, as this could result from having a screw hole directly at the top of the drive arm 24.

[0034] The split threaded connection structure of this invention uses screw connection, which can avoid the problem of falling off due to plastic aging that occurs with welding or glue fixing methods. Secondly, the use of split threads reduces the thickness of the threaded connector while increasing the effective length of the threaded connection. At the same time, since the threads are set on two connectors respectively, it is not necessary to open screw holes on both connectors. When used on small workpieces such as infrared shutter parts, it can reduce the probability of damage to the connection parts of the parts.

Claims

1. An infrared lens shutter with enhanced anti-deformation and anti-slip properties, characterized in that: The shutter's light-shielding blade (3) and the drive mechanism are connected by a split threaded connection structure. The drive mechanism includes a drive arm (24) and a drive motor assembly (2). The light-shielding blade (3) is provided with a connecting hole (321). The inner wall of the threaded connecting half hole (3211) of the connecting hole (321) is engaged with the external thread of a screw. The drive arm (24) is provided with a connecting protrusion (242). The connecting protrusion (242) extends into the locking half hole (3212) of the connecting hole (321) and one side of it is engaged with the external thread of a screw. The split-type threaded connection structure includes a first connector and a second connector that are connected to each other by screws. The first connector has a connecting hole (321) on which part of the inner wall is connected to the external thread of the screw. The second connector has a connecting protrusion (242) that extends into the connecting hole (321) and whose side is connected to the external thread of the screw. The light-shielding blade (3) includes a light-shielding plate (31) made of metal for blocking light. The light-shielding plate (31) is provided with a light-shielding plate support arm (311) for supporting the light-shielding plate (31). A plastic anti-deformation drive connecting arm (32) is connected to the light-shielding plate support arm (311). The connecting hole (321) is provided on the anti-deformation drive connecting arm (32). The shutter base (1) of the infrared shutter is provided with an impact buffer mechanism, and the anti-deformation drive connecting arm (32) is provided with an anti-impact deformation mechanism. The anti-impact deformation mechanism and the impact buffer mechanism are configured in cooperation. The impact buffer mechanism includes an impact buffer pad (11) and a buffer pad mounting bracket (12). The buffer pad mounting bracket (12) is set on the shutter base (1). The impact buffer pad (11) is installed inside the buffer pad mounting bracket (12). The anti-impact deformation mechanism is an anti-impact protrusion (323) set on the drive connecting arm (32) to prevent the light-shielding blade from impacting and deforming. The light-shielding baffle (31) is provided with anti-deformation reinforcing ribs. The anti-deformation reinforcing ribs are located in the middle of the light-shielding baffle (31). The reinforcing ribs are annular and have an opening. One end of the opening extends toward the light-shielding baffle support arm (311) and is located on the light-shielding baffle support arm (311). The light-shielding blade (3) is made by insert injection molding process, the light-shielding baffle (31) is an insert, and the light-shielding baffle support arm (311) is embedded in the anti-deformation drive connecting arm (32); The permanent magnet rotating part (23) of the drive motor assembly (2) is provided with an anti-slip limiting groove (232) to prevent the drive arm (24) from slipping in the drive arm connection mounting hole (231). The anti-slip limiting groove (232) is provided on one bottom surface of the permanent magnet rotating part (23), and the drive arm (24) is installed in the anti-slip limiting groove (232).

2. The infrared lens shutter with enhanced anti-deformation and anti-slip properties as described in claim 1, characterized in that: The first connector is provided with a connecting boss (322), and the connecting hole (321) is disposed in the connecting boss (322).

3. The infrared lens shutter with enhanced anti-deformation and anti-slip properties as described in claim 1, characterized in that: The connecting hole (321) includes a threaded connecting half hole (3211) for connecting with the external thread of a screw and a locking half hole (3212) for inserting the connecting protrusion.

Images