A circular polarizing filter

Abstract

This invention relates to the field of CPL filter technology, and particularly to a novel CPL filter that solves the problem in existing technologies where each filter can only be used with one type of lens, making it impossible to adapt a single filter to multiple lens models. This results in significant financial investment and inconvenience in practical use. The novel CPL filter includes a fixing frame, a connecting frame, and a filter body. The filter body is fixedly installed inside the connecting frame. A mounting bracket is fixedly installed on the side wall of the fixing frame, and the filter body is slidably inserted into the top of the mounting bracket. A clamping device for mounting the fixing frame onto the lens is provided inside the fixing frame. This invention, through the inclusion of a clamping device, fixing frame, soft sealing sleeve, and locking rope, facilitates the installation of the filter body onto lens bodies of various sizes. Furthermore, after installation, it prevents direct external light from entering the interior, enhancing practicality.

Description

Technical Field

[0001] This invention relates to the field of circular polarizing filter technology, and more particularly to a circular polarizing filter. Background Technology

[0002] CPL filters, or polarizing filters, can produce polarized light, increase color intensity, eliminate reflections from non-metallic surfaces such as glass or water, and reduce the soft focus caused by atmospheric haze in landscape photos, without altering the overall color balance of the image.

[0003] When installing a filter, you generally need to select a filter of the appropriate size and rotate it to connect it to the lens body via a thread. However, this connection method requires selecting a filter of the appropriate size, and it is not possible to use a single filter to fit multiple lens models. Therefore, in actual use, it requires a significant investment of resources and is not conducive to practical use. Summary of the Invention

[0004] The purpose of this invention is to provide a circular polarizing filter that solves the problem in the prior art where one filter can only be used with one type of lens, making it impossible for one filter to be compatible with multiple lens models. This results in a large investment of resources and is not conducive to practical use.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A circular polarizing filter includes a fixed frame, a connecting frame, and a filter body. The filter body is fixedly installed inside the connecting frame. A mounting bracket is fixedly installed on the side wall of the fixed frame. The filter body is slidably inserted into the top of the mounting bracket. A clamping device for mounting the fixed frame onto a lens is provided inside the fixed frame. The clamping device includes a screw, two moving rods, two elastic pads, and a knob. The knob is fixedly installed at the end of the screw. The screw is rotatably inserted into the side wall of the fixed frame near the top. The tops of the two moving rods are slidably connected to the top wall of the fixed frame. The screw has threads that penetrate the two moving rods. A connecting ring is fixedly installed on the side of the fixed frame away from the mounting bracket. A soft sealing sleeve is fixedly installed on the side of the connecting ring away from the fixed frame. A velvet sleeve is sewn onto the end of the soft sealing sleeve away from the connecting ring. A locking rope is provided inside the velvet sleeve, and a locking block is provided on the surface of the locking rope.

[0007] Preferably, the filter body is composed of a first glass sheet, a second glass sheet, and a polarizing film, which are bonded together with adhesive, and the polarizing film is located between the first glass sheet and the second glass sheet.

[0008] Preferably, the fixing frame has a circular hole on the side near the connecting ring that matches the size of the connecting ring.

[0009] Preferably, the two elastic pads are respectively fixedly installed on the side of the two movable rods that are close to each other.

[0010] Preferably, the screw has two opposite threads with its midpoint as the dividing line, and the screw passes through the two moving rods respectively by means of the two threads on its surface.

[0011] Preferably, two clamping blocks are provided on the top side of the fixed frame near the mounting bracket. A sliding rod is fixedly installed at the bottom end of each of the two clamping blocks. A round block is slidably sleeved on the surface of the sliding rod, and a spring is sleeved on the surface of the sliding rod. The two ends of the spring are fixedly connected to the round block and the clamping block, respectively.

[0012] Preferably, the top of the fixed frame has two sliding grooves that are adapted to the size of the two clamping blocks. The bottom wall of the sliding groove has a circular groove that is adapted to the size of the circular block. The bottom wall of the circular groove has a vertical groove that is adapted to the size of the sliding rod. The surface of the sliding rod is movably connected to the vertical groove. The surface of the circular block is rotatably connected to the circular groove. The surface of the clamping block is slidably connected to the sliding groove.

[0013] A rubber pad is fixedly installed at the bottom of the clamping block.

[0014] The clamping block is configured with a "U" shaped structure.

[0015] The top of the mounting bracket has an arc-shaped groove.

[0016] The present invention has at least the following beneficial effects:

[0017] By incorporating a clamping device, a fixing frame, a soft sealing sleeve, and a locking rope, the filter body can be easily installed on lens bodies of various sizes. Moreover, after installation, it can prevent external light sources from directly shining into the interior, thus enhancing its practicality.

[0018] The present invention also has the following beneficial effects:

[0019] By setting a detachable connecting frame and filter body, the filter body can be easily removed from the mounting bracket for protection, preventing the second glass plate of the filter body from being scratched or damaged.

[0020] The present invention also has the following beneficial effects:

[0021] By incorporating structures such as clamping blocks, springs, round blocks, and sliding rods, the connecting frame is easily confined within the mounting bracket. This facilitates easy disassembly and installation of the connecting frame during use and prevents it from being easily lost, thus enhancing its convenience. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 For the present invention Figure 1 Side view;

[0025] Figure 3 This is a schematic diagram of the locking rope structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the movable rod structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the connecting frame structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the mounting frame structure of the present invention;

[0029] Figure 7 For the present invention Figure 6 Schematic diagram of the structure at point A in the middle;

[0030] Figure 8 This is a sectional view of the fixed frame of the present invention;

[0031] Figure 9 For the present invention Figure 8 Schematic diagram of the structure at point B;

[0032] Figure 10 This is a cross-sectional view of the filter body of the present invention.

[0033] In the diagram: 1. Fixed frame; 2. Connecting frame; 3. Filter body; 31. First glass plate; 32. Polarizing film; 33. Second glass plate; 4. Screw; 5. Elastic rubber pad; 6. Moving rod; 7. Knob; 8. Connecting ring; 9. Soft sealing sleeve; 10. Flannel sleeve; 11. Locking rope; 12. Locking block; 13. Mounting bracket; 14. Pressing block; 15. Rubber pad; 16. Spring; 17. Round block; 18. Sliding rod; 19. Sliding groove; 20. Round groove; 21. Vertical groove. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0035] Reference Figure 1-10 A circular polarizing filter includes a fixed frame 1, a connecting frame 2, and a filter body 3. The filter body 3 is fixedly installed inside the connecting frame 2. A mounting bracket 13 is fixedly installed on the side wall of the fixed frame 1. The filter body 3 is slidably inserted into the top of the mounting bracket 13. A clamping device for mounting the fixed frame 1 onto a lens is provided inside the fixed frame 1. The clamping device includes a screw 4, two moving rods 6, two elastic rubber pads 5, and a knob 7. The knob 7 is fixedly installed at the port of the screw 4. The screw 4 is rotatably inserted into the side wall of the fixed frame 1 near the top. The tops of the two moving rods 6 are slidably connected to the top wall of the fixed frame 1. The threads on the surface of the screw 4 penetrate the two moving rods 6. A connecting ring 8 is fixedly installed on the side of the fixed frame 1 away from the mounting bracket 13. A soft sealing sleeve 9 is fixedly installed on the side of the connecting ring 8 away from the fixed frame 1. A velvet sleeve 10 is sewn onto the end of the soft sealing sleeve 9 away from the connecting ring 8. A locking rope 11 is provided inside the velvet sleeve 10. A locking block 12 is provided on the surface of the locking rope 11.

[0036] This solution includes the following workflow:

[0037] In use, the fixing frame 1 is placed on the lens body, and then the clamping device is used to clamp the entire fixing frame 1 onto the lens body. The connecting frame 2 with the filter body 3 is inserted into the mounting bracket 13. At this time, the soft sealing sleeve 9 is also placed on the lens body. Pull the locking rope 11 to tie the velvet sleeve 10 onto the lens body. The locking block 12 is used to prevent the locking rope 11 from loosening. Thus, the soft sealing sleeve 9 and the velvet sleeve 10 seal one side of the fixing frame 1, preventing the light beam from penetrating directly from one side of the fixing frame 1 and affecting the use of the lens. In use, the clamping device is directly rotated by turning the knob 7. The knob 7 drives the screw 4 to rotate, and the screw 4 drives the two moving rods 6 to move, thereby using the two moving rods 6 to clamp and fix the lens body.

[0038] Based on the above work process, it can be concluded that:

[0039] By incorporating a clamping device, a fixing frame 1, a soft sealing sleeve 9, and a locking rope 11, the filter body 3 can be easily installed on lens bodies of various sizes. Moreover, after installation, external light sources can be prevented from directly shining into the interior, thus enhancing its practicality.

[0040] Furthermore, the filter body 3 is composed of a first glass sheet 31, a second glass sheet 33, and a polarizing film 32. The first glass sheet 31, the second glass sheet 33, and the polarizing film 32 are bonded together with adhesive, and the polarizing film 32 is located between the first glass sheet 31 and the second glass sheet 33.

[0041] Specifically, the desired transmittance can be controlled by replacing the first glass plate 31 and the second glass plate 33 on both sides of the polarizing film 32. There are generally two methods for replacing the transparent glass: one is to replace the transparent glass with ND glass (neutral gray glass material). Different types and thicknesses of this glass material have different light-reducing capabilities, essentially resembling black glass, thus reducing the overall transmittance of the filter. The second method is to reduce the transmittance of the lens by vacuum coating the surface of the transparent glass (i.e., attenuation film system, metallic neutral density film), thereby reducing the overall transmittance of the filter. This coating method allows for thickness adjustments from hundreds of nanometers to several micrometers depending on the coating material, arbitrarily controlling the light transmission intensity of the lens. Both methods ultimately aim to reduce the overall transmittance of the filter. By using the first glass plate 31 and the second glass plate 33 to reduce visible light transmittance, the performance of the CPL filter using ordinary polarizing films in filtering visible light is improved, meeting the high-definition shooting needs of users using this CPL filter on cameras.

[0042] Furthermore, the fixing frame 1 has a round hole on the side near the connecting ring 8 that matches the size of the connecting ring 8, so that the fixing frame 1 can be fitted onto the lens body.

[0043] Furthermore, two elastic rubber pads 5 are respectively fixedly installed on the side of the two moving rods 6 that are close to each other. The two elastic rubber pads 5 can be used to protect the lens body during the clamping process.

[0044] Furthermore, the screw 4 has two opposite threads with its midpoint as the dividing line, and the screw 4 uses the two threads on its surface to thread through the two moving rods 6 respectively.

[0045] Furthermore, two clamping blocks 14 are provided on the top side of the fixed frame 1 near the mounting bracket 13. A slide rod 18 is fixedly installed at the bottom of each of the two clamping blocks 14. A round block 17 is slidably sleeved on the surface of the slide rod 18, and a spring 16 is sleeved on the surface of the slide rod 18. The two ends of the spring 16 are fixedly connected to the round block 17 and the clamping block 14 respectively. The clamping block 14 restricts the connecting frame 2 from falling off easily from above, thereby preventing the connecting frame 2 from being lost during carrying.

[0046] Furthermore, the top of the fixed frame 1 has two sliding grooves 19 that are adapted to the size of the two clamping blocks 14. The bottom wall of the sliding groove 19 has a circular groove 20 that is adapted to the size of the circular block 17. The bottom wall of the circular groove 20 has a vertical groove 21 that is adapted to the size of the sliding rod 18. The surface of the sliding rod 18 is movably connected to the vertical groove 21, the surface of the circular block 17 is rotatably connected to the circular groove 20, and the surface of the clamping block 14 is slidably connected to the sliding groove 19.

[0047] Furthermore, a rubber pad 15 is fixedly installed at the bottom of the clamping block 14, which can be used to protect the connecting frame 2.

[0048] Furthermore, the clamping block 14 is configured with a "U" shape, which makes it easy to hold the clamping block 14 by hand.

[0049] Furthermore, the top of the mounting bracket 13 has an arc-shaped groove. When the connecting frame 2 needs to be disassembled, simply hold the clamping block 14 and pull it upward. The clamping block 14 drives the slide rod 18 to move upward, while the round block 17 remains stationary, thereby stretching the spring 16. After the clamping block 14 moves to the slide groove 19, it is rotated, which causes the slide rod 18 to rotate. The slide rod 18 can cause the round block 17 to rotate simultaneously, thereby causing the spring 16 to rotate synchronously. After rotation, the clamping block 14 is released. Under the action of the spring 16, the clamping block 14 is located at the top of the fixed frame 1. At this time, the connecting frame 2 can be removed using the arc-shaped groove at the top of the mounting bracket 13.

[0050] In summary, during use, the fixing frame 1 is placed on the lens body, and then the clamping device is used to clamp the entire fixing frame 1 onto the lens body. The connecting frame 2, on which the filter body 3 is installed, is inserted into the mounting bracket 13. At this time, the soft sealing sleeve 9 is also placed on the lens body. Pulling the locking rope 11, the velvet sleeve 10 is tied to the lens body. The locking block 12 is used to prevent the locking rope 11 from loosening. Thus, the soft sealing sleeve 9 and the velvet sleeve 10 seal one side of the fixing frame 1, preventing the light beam from directly penetrating from one side of the fixing frame 1 and affecting the use of the lens. During use, the clamping device is operated by directly rotating the knob 7, which drives the screw... Rotating rod 4 causes screw 4 to drive two moving rods 6 to move, thereby clamping and fixing the lens body using the two moving rods 6. Two elastic rubber pads 5 protect the lens body during clamping. Connecting frame 2 is inserted into the top of mounting bracket 13, and clamping block 14 prevents it from easily detaching from above, thus preventing loss during transport. To disassemble connecting frame 2, simply grasp clamping block 14 and pull it upwards. Clamping block 14 moves sliding rod 18 upwards, while round block 17 remains stationary, stretching spring 16. After clamping block 14 moves to sliding groove 19, it is rotated. Rotating the slide bar 18 causes the circular block 17 to rotate simultaneously, which in turn causes the spring 16 to rotate synchronously. After rotation, the clamping block 14 is released. Under the action of the spring 16, the clamping block 14 is located at the top of the fixed frame 1. At this time, the connecting frame 2 can be removed using the arc-shaped groove at the top of the mounting bracket 13. When installing the connecting frame 2, the clamping block 14 is placed directly in the slide groove 19 to restrict the connecting frame 2. The rubber pad 15 can protect the connecting frame 2. The clamping block 14 is designed with a "U" shape for easy handling. By setting up a clamping device, a fixed frame 1, a soft sealing sleeve 9, and a locking rope 11, etc., The structure facilitates the mounting of the filter body 3 onto lenses of various sizes, and after installation, it prevents external light sources from directly shining into the interior, thus enhancing practicality. By setting a detachable connecting frame 2 and filter body 3, the filter body 3 can be easily removed from the mounting bracket 13 for protection, preventing the second glass plate 33 of the filter body 3 from being scratched or damaged. By setting a clamping block 14, spring 16, round block 17 and sliding rod 18, the connecting frame 2 can be easily confined inside the mounting bracket 13, making it easy to disassemble and install the connecting frame 2 during use, and preventing the connecting frame 2 from being easily lost, thus enhancing its convenience.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A circular polarizing filter, comprising a fixing frame (1), a connecting frame (2), and a filter body (3), wherein the filter body (3) is fixedly installed inside the connecting frame (2), characterized in that, A mounting bracket (13) is fixedly installed on the side wall of the fixed frame (1). The filter body (3) is slidably inserted into the top of the mounting bracket (13). The fixed frame (1) is provided with a clamping device for mounting the fixed frame (1) onto the lens. The clamping device includes a screw (4), two moving rods (6), two elastic pads (5), and a knob (7). The knob (7) is fixedly installed at the port of the screw (4). The screw (4) is rotatably inserted into the side wall of the fixed frame (1) near the top. The two moving rods (6) The top of each part is slidably connected to the top wall of the fixed frame (1). The screw (4) has threads that pass through the two moving rods (6). A connecting ring (8) is fixedly installed on the side of the fixed frame (1) away from the mounting bracket (13). A soft sealing sleeve (9) is fixedly installed on the side of the connecting ring (8) away from the fixed frame (1). A velvet sleeve (10) is sewn to the end of the soft sealing sleeve (9) away from the connecting ring (8). A locking rope (11) is provided inside the velvet sleeve (10). A locking block (12) is provided on the surface of the locking rope (11).

2. A circular polarizing filter according to claim 1, characterized in that, The filter body (3) is composed of a first glass sheet (31), a second glass sheet (33) and a polarizing film (32). The first glass sheet (31), the second glass sheet (33) and the polarizing film (32) are bonded together with glue. The polarizing film (32) is located between the first glass sheet (31) and the second glass sheet (33).

3. A circular polarizing filter according to claim 1, characterized in that, The fixed frame (1) has a circular hole on the side near the connecting ring (8) that matches the size of the connecting ring (8).

4. A circular polarizing filter according to claim 1, characterized in that, The two elastic pads (5) are respectively fixedly installed on the side of the two movable rods (6) that are close to each other.

5. A circular polarizing filter according to claim 1, characterized in that, The screw (4) has two opposite threads with its midpoint as the dividing line. The screw (4) passes through the two moving rods (6) respectively by means of the two threads on its surface.

6. A circular polarizing filter according to claim 1, characterized in that, Two clamping blocks (14) are provided on the top side of the fixed frame (1) near the mounting bracket (13). A sliding rod (18) is fixedly installed at the bottom of each of the two clamping blocks (14). A round block (17) is slidably sleeved on the surface of the sliding rod (18). A spring (16) is sleeved on the surface of the sliding rod (18). The two ends of the spring (16) are fixedly connected to the round block (17) and the clamping block (14) respectively.

7. A circular polarizing filter according to claim 1, characterized in that, The top of the fixed frame (1) has two sliding grooves (19) that are adapted to the size of the two pressing blocks (14) at a position relative to the two pressing blocks (14). The bottom wall of the sliding groove (19) has a circular groove (20) that is adapted to the size of the circular block (17). The bottom wall of the circular groove (20) has a vertical groove (21) that is adapted to the size of the sliding rod (18). The surface of the sliding rod (18) is movably connected to the vertical groove (21). The surface of the circular block (17) is rotatably connected to the circular groove (20). The surface of the pressing block (14) is slidably connected to the sliding groove (19).

8. A circular polarizing filter according to claim 7, characterized in that, A rubber pad (15) is fixedly installed at the bottom of the clamping block (14).

9. A circular polarizing filter according to claim 7, characterized in that, The clamping block (14) is configured with a "U" shaped structure.

10. A circular polarizing filter according to claim 1, characterized in that, The top of the mounting bracket (13) has an arc-shaped groove.

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