Light filtering device with stable operation and television camera

Abstract

The invention discloses a light filtering device capable of running stably and a television camera, and aims to solve the problem that a light filtering device in an existing television camera is unstable in running and affects image quality. The light filtering device specifically comprises a rack, a box body arranged on the rack, and a light filtering wheel motor arranged outside the box body and mounted on the rack; the filter wheel assembly is arranged in the box body; a box body of the box body is fixedly connected with the rack, and the box cover covers the front face of the box body. A stop block notch is formed in the circumferential side wall of the filter wheel; the filter wheel stop dog is fixedly mounted in the stop dog notch; the filter wheel motor is located on the back face of the box body and coaxially connected with the driving gear. A protrusion is arranged on the inner wall of the box body, the bearing nail is arranged in the protrusion in the box body in a penetrating mode, the first deep groove ball bearing and the second deep groove ball bearing are coaxially arranged between the nail head of the bearing nail and the end face of the protrusion in a sleeved mode side by side, and the filter wheel is coaxially arranged outside the first deep groove ball bearing, the second deep groove ball bearing and the filter wheel in a sleeved mode and meshed with the driving gear. The limiting assembly is installed on one side of the filter wheel, and the acting end of the limiting assembly corresponds to the filter wheel check block.

Description

Technical Field

[0001] The present invention relates to a television camera system, in particular to a stably operating optical filtering device and a television camera. Background Art

[0002] Television camera systems using multispectral imaging can obtain richer information for target acquisition and interference identification, outperforming single-band systems in target detection, identification, and interference rejection. However, due to the tight spatial constraints of television camera systems, particularly in the radial and axial directions of the filter wheel, the selection of motors and sensors for multispectral imaging televisions, as well as the layout and adjustment space of the rotating filter wheel mechanism, must meet miniaturization requirements while also meeting system technical specifications and reliability requirements.

[0003] Existing television cameras typically use filter wheel nails to mount the filter wheel. This method offers the advantages of simple processing and easy assembly and disassembly. However, due to the filter wheel's inherent axial design, which allows for at least 0.1mm of clearance, and the clearance between the filter wheel mounting shaft and the filter wheel mounting hole, their combined motion is effectively a spiral motion. This causes back-and-forth oscillation during rotation, affecting image quality.

[0004] Another filter wheel mounting method uses a filter wheel pin and ball bearing assembly. The filter wheel's rotational hole is machined into two opposing flared bores. The filter wheel pin passes through the hole and uses a threaded front end to connect the filter wheel assembly to a boss on the housing or lens barrel. Two sets of ball bearings are mounted between the flared bore and the filter wheel pin. The ball bearings make point contact with both the flared bore and the surface of the filter wheel pin. Adjusting the thread depth of the filter wheel pin allows for adjustment of the filter wheel assembly's rotational tightness. This method requires high precision machining of components and significantly increases the number of mating parts. Furthermore, the tightness of the filter wheel pin thread connection affects the filter wheel assembly's rotational stability, and assembly and disassembly are inconvenient.

[0005] Therefore, it is particularly urgent to obtain a filter device with a simple structure, stable operation, and easy assembly and disassembly. Summary of the Invention

[0006] The present invention aims to provide a stable filter device and a television camera, so as to solve the technical problems of unstable operation of the filter device in the existing television camera, which affects the image quality, or has a complex structure and is inconvenient to disassemble and assemble.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A stable filter device is characterized in that it comprises a frame, a box arranged on the frame, a filter wheel motor arranged outside the box and mounted on the frame, and a filter wheel assembly, a filter wheel block, a limit assembly and a driving gear arranged in the box;

[0009] The box body includes a box body and a box cover; the box body is fixedly connected to the frame, and the box cover is installed on the front of the box body, that is, at the opening of the box body;

[0010] The filter wheel assembly includes a filter wheel, a bearing pin, a first deep groove ball bearing and a second deep groove ball bearing; a plurality of filters are mounted on the filter wheel, and a stopper notch is provided on the circumferential side wall of the filter wheel; the filter wheel stopper is fixedly mounted in the stopper notch;

[0011] The filter wheel motor is located at the back of the box body, and its rotating shaft passes through the back of the box body and extends into the box body and is coaxially connected to the driving gear;

[0012] A cylindrical protrusion is provided on the inner wall of the box body, and the bearing nail is axially inserted into the protrusion, and a bearing installation space is left between the nail head of the bearing nail and the end surface of the protrusion;

[0013] The first deep groove ball bearing and the second deep groove ball bearing are located in the bearing installation space and are sleeved side by side on the bearing nail, and the inner rings of the two are fixedly connected to the bearing nail;

[0014] The filter wheel is coaxially mounted outside the first deep groove ball bearing, the second deep groove ball bearing and the nail head, and is fixedly connected to the outer rings of the first deep groove ball bearing and the second deep groove ball bearing, has a clearance fit with the nail head, and is also meshed with the driving gear;

[0015] The limiting component is located on one side of the circumferential surface of the filter wheel and is installed on the inner wall of the box body, and its active end corresponds to the filter wheel stopper.

[0016] Furthermore, an annular protrusion is provided on the inner wall of the filter wheel connected to the first deep groove ball bearing and the second deep groove ball bearing;

[0017] A first annular notch is provided on the outer wall of the outer ring of the first deep groove ball bearing on the side close to the second deep groove ball bearing;

[0018] A second annular notch is provided on the outer wall of the outer ring of the second deep groove ball bearing on the side close to the first deep groove ball bearing;

[0019] When the first deep groove ball bearing and the second deep groove ball bearing are arranged side by side, the first annular notch and the second annular notch are spliced into an annular groove matching the annular protrusion, thereby achieving fixed connection between the filter wheel and the outer rings of the first deep groove ball bearing and the second deep groove ball bearing.

[0020] Furthermore, the inner rings of the first deep groove ball bearing and the second deep groove ball bearing are interference fitted with the bearing pins;

[0021] A gap of 0.1-0.3 mm is provided between the first deep groove ball bearing and the second deep groove ball bearing.

[0022] Furthermore, the filter wheel block and the block notch are both L-shaped and are matched and installed with each other so that one end of the filter wheel block extends out of the block notch and corresponds to the active end of the limiting assembly.

[0023] Furthermore, an arc-shaped avoidance notch is provided on the inner wall of the upper side of the box body, which is used for rotating avoidance toward the end of the filter wheel stopper extending out of the stopper notch.

[0024] Furthermore, a top screw plane is provided on the side wall of the rotating shaft of the filter wheel motor;

[0025] A top screw is passed through the driving gear along its radial direction; and the top screw is tightly fixed on the top screw plane.

[0026] Furthermore, the tooth surface width of the driving gear is 4-5 mm.

[0027] Furthermore, the limit assembly includes a limit bracket and a limit switch;

[0028] The limiting bracket is installed on the inner wall of the box body;

[0029] The limit switch is mounted on the limit bracket and corresponds to one end of the filter wheel stopper extending out of the stopper notch.

[0030] Furthermore, the filter is mounted on the filter wheel via a filter pressing ring;

[0031] The filter wheel motor is mounted on the frame via a motor bracket;

[0032] A detector trimming pad is also press-fitted between the box body and the box cover.

[0033] The present invention also provides a stably operating television camera, which is special in that it includes the above-mentioned stably operating optical filter device.

[0034] Beneficial effects of the present invention:

[0035] 1. The present invention sets a protrusion on the box body, and installs the filter wheel through the bearing pin, the first deep groove ball bearing and the second deep groove ball bearing. The overall structure is simple and convenient for disassembly and assembly, and also easy to maintain.

[0036] 2. The present invention positions the filter wheel axially by axially cooperating between the bearing pins, the first deep groove ball bearing, and the second deep groove ball bearing. Simultaneously, the filter wheel is radially positioned by annular notches on the first and second deep groove ball bearings and annular protrusions on the filter wheel. This ensures that the rotational stability of the filter wheel is entirely dependent on the rotational performance of the first and second deep groove ball bearings. The deep groove ball bearings themselves have high precision and stability, significantly improving the rotational stability of the filter wheel assembly, thereby significantly enhancing image quality while also reducing noise.

[0037] 3. The present invention connects and fastens the filter wheel block to the circumferential side wall of the filter wheel, and at the same time connects and fastens the limit assembly to the inner wall of the box body and is located on one side of the filter wheel, thereby greatly compressing the depth of the entire box from the front to the back, and can directly reduce the box depth from the existing 20-30mm to 5-6mm.

[0038] 4. The present invention sets the filter wheel block and the block gap to be L-shaped, which not only achieves stable installation of the filter wheel block, but also enables the filter wheel block to be stably matched with the limit assembly, while also reducing the depth of the box.

[0039] 5. The present invention provides an arc-shaped avoidance notch on the box body, which not only maintains the firmness of the box body but also avoids the box body from hindering the rotation of the filter wheel block.

[0040] 6. The present invention increases the tooth surface width of the driving gear, reduces the influence of the top screw installation hole on the meshing of the driving gear and the filter wheel, and further improves the stability of the filter wheel operation.

[0041] 7. In the present invention, a gap is provided between the first deep groove ball bearing and the second deep groove ball bearing, which can ensure that the first deep groove ball bearing and the second deep groove ball bearing are installed in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 1 is a schematic structural diagram of an embodiment of a stably operating optical filtering device of the present invention;

[0043] Figure 2 This is a schematic diagram of the front structure of the box when it is opened in an embodiment of the present invention;

[0044] Figure 3 is a side cross-sectional view of a stable operating optical filter device according to an embodiment of the present invention, excluding the box cover and the detector trimming pad;

[0045] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle;

[0046] Figure 5 is a front structural schematic diagram of a filter wheel in an embodiment of the present invention;

[0047] Figure 6 It is a schematic diagram of the three-dimensional structure of the driving gear according to an embodiment of the present invention.

[0048] Figure Number:

[0049] 1-frame, 2-filter wheel assembly, 2-1-filter wheel, 2-2-bearing pin, 2-3-first deep groove ball bearing, 2-4-second deep groove ball bearing, 2-5-filter, 2-6-filter pressure ring; 3-filter wheel block, 4-limiting assembly, 5-drive gear, 6-motor bracket, 7-filter wheel motor, 8-detector trimming pad, 9-box cover, 10-filter. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0051] like Figure 1 As shown, the stably operating filter wheel device provided by the present invention includes a frame 1, a filter wheel assembly 2, a filter wheel block 3, a limit assembly 4, a drive gear 5, a motor bracket 6 and a filter wheel motor 7. The frame 1 is the basis for the installation of other components, and is threadedly connected to the entire device through the screw holes on its bottom surface. A box body is provided on the frame 1; the box body includes a box body and a box cover 9, and the lower side wall of the box body is fixed to the frame 1. Preferably, the box body and the frame 1 are integrated, and the box cover 9 is installed on the front of the box body, that is, the opening of the box body; a detector trimming pad 8 is also pressed between the box body and the box cover 9. The motor bracket 6 is fastened to the large plane outside the back of the box body by two screws. The filter wheel motor 7 is fastened to the motor bracket 6 by two screws, and the rotating shaft of the filter wheel motor 7 passes through the back of the box body and extends into the box body; the drive gear 5 is located in the box body and is mounted on the rotating shaft, and the rotating shaft is provided with a top screw plane; as shown Figure 6 As shown, a jackscrew hole is provided along the radial direction of the driving gear 5, and a jackscrew is provided inside the hole. The jackscrew passes through the jackscrew hole and is tightly fixed on the jackscrew plane of the rotating shaft of the filter wheel motor 7, thereby realizing a stable connection between the driving gear 5 and the rotating shaft.

[0052] like Figure 2-4As shown, the filter wheel assembly 2 includes a filter wheel 2-1, a bearing pin 2-2, a first deep groove ball bearing 2-3, a second deep groove ball bearing 2-4, and a plurality of filters 2-5 and a filter pressing ring 2-6; a cylindrical protrusion is provided on the inner wall of the box body parallel to the back side; the bearing pin 2-2 is inserted into the protrusion along the axial direction of the protrusion, that is, from the front side of the box body to the back side thereof, and a bearing installation space is left between the pin head of the bearing pin 2-2 and the end face of the protrusion; the first deep groove ball bearing 2-3 and the second deep groove ball bearing 2-4 are located in the bearing installation space, and the two are mounted side by side on the bearing pin 2-2, and the inner rings of the two are slightly interference fitted with the bearing pin 2-2; the center of the filter wheel 2-1 has a mounting hole, and the filter wheel 2-1 is coaxially mounted on the first deep groove ball bearing 2-3 and the second deep groove ball bearing 2-4 through its mounting hole. The inner wall of the mounting hole is provided with an annular protrusion, excluding the head of the bearing pin 2-2. A first annular notch is provided on the outer wall of the outer ring of the first deep groove ball bearing 2-3, near the second deep groove ball bearing 2-4. A second annular notch is provided on the outer wall of the outer ring of the second deep groove ball bearing 2-4, near the first deep groove ball bearing 2-3. When the first and second deep groove ball bearings 2-3 and 2-4 are arranged side by side, the first and second annular notches can be joined to form an annular groove that matches the annular protrusion. The annular protrusion and the annular groove engage with each other, thereby stably securing the filter wheel 2-1 to the outer rings of the first and second deep groove ball bearings 2-3 and 2-4. This also creates an annular gap between the head of the bearing pin 2-2 and the inner wall of the mounting hole of the filter wheel 2-1, thereby reducing the depth of the entire housing. Each filter 2-5 is mounted on the filter wheel 2-1 via a filter retaining ring 2-6. The filter wheel 2-1 meshes with the drive gear 5.

[0053] The drive gear 5 is different from the traditional drive gear. It has no stepped surface and the top screw hole is directly opened on the tooth surface. In order to prevent the top screw hole on the drive gear 5 for inserting the top screw from affecting the mutual engagement between the filter wheel 2-1 and the drive gear 5, the tooth surface width of the drive gear 5 in this embodiment is widened on the basis of the existing one, and is preferably set to 4-5 mm.

[0054] like Figure 5 As shown, an L-shaped stopper notch is provided on the circumferential sidewall of the filter wheel 2-1, and the filter wheel stopper 3 is also L-shaped. One end of the filter wheel stopper 3 is fastened to the stopper notch of the filter wheel 2-1 via two screws, while the other end of the filter wheel stopper 3 extends out of the stopper notch.

[0055] The limit assembly 4 includes a limit switch and a limit bracket; the limit bracket is fastened to the large plane of the inner wall of the box body by two screws and is located on one side of the circumferential surface of the filter wheel 2-1. The limit switch is set on the limit bracket, and its active end corresponds to the end of the L-shaped filter wheel stopper 3 extending out of the stopper gap. When the filter wheel 2-1 rotates, the filter wheel stopper 3 rotates simultaneously with the filter wheel 2-1, and stops rotating when one end of the filter wheel stopper 3 touches the limit switch.

[0056] In the stable operation of the filter wheel device of this embodiment, the first deep groove ball bearing 2-3 and the second deep groove ball bearing 2-4 are mounted side by side on the bearing pin 2-2. In practice, a clearance of 0.1-0.3 mm is required between the inner and outer ring inner end surfaces of the first and second deep groove ball bearings 2-3, 2-4 to ensure proper installation of the first and second deep groove ball bearings 2-3, 2-4. Furthermore, the bearing pin 2-2 and the inner rings of the first and second deep groove ball bearings 2-3, 2-4 are slightly interference fit. The filter wheel 2-1 is threadedly connected to a protrusion within the housing body via the bearing pin 2-2, the first and second deep groove ball bearings 2-3, 2-4. The protrusion ensures a clearance between the filter wheel 2-1 and the inner wall of the housing to prevent friction. Because the filter wheel assembly 2 is securely connected in both the axial and radial directions, the rotational stability of the filter wheel 2-1 depends on the rotational performance of the first deep groove ball bearing 2-3 and the second deep groove ball bearing 2-4. The deep groove ball bearings themselves have high precision and stability, thus significantly improving the rotational stability of the filter wheel assembly 2 while also reducing noise.

[0057] In addition to providing a stable filter wheel assembly, the present invention also provides a television camera equipped with the same. Conventional filter wheel assemblies occupy a significant axial space between the lens barrel assembly and the detector, resulting in a relatively long focal length for the optical system. However, overall system requirements often require the corresponding optical subsystem to have a focal length as short as possible. The filter wheel assembly is located between the lens barrel assembly and the detector, and other components have limited axial compression. Therefore, it is generally necessary to minimize the axial distance between the lens barrel assembly and the detector. This requires the installation housing of the filter wheel assembly in a television camera to be as shallow as possible. The present invention significantly reduces the housing depth by fastening the filter wheel stopper 3 to the side stopper notch of the filter wheel 2-1 of the filter wheel assembly 2 and fastening the limit switch and limit bracket to a large flat surface on the inner wall of the housing. The housing depth can be reduced from the typical 20-30 mm to 5-6 mm. The drive gear 5 has a widened tooth surface to minimize the effect of the jackscrew hole on gear meshing.

[0058] Unlike conventional filter wheel pin installation or filter wheel pin + ball bearing installation methods, this embodiment utilizes a first deep groove ball bearing and a second deep groove ball bearing installed side by side. This solves the operational instability associated with conventional filter wheel pin installation and the complex processing, installation, and maintenance associated with the filter wheel pin + ball bearing method. This improves operational stability while also reducing noise and facilitating installation and maintenance. The first and second deep groove ball bearings are installed with interference fit on the end faces of the filter wheel mounting hole. The bearing pins also have a slight interference fit with the inner rings of the first and second deep groove ball bearings. Furthermore, the bearing pins are directly fastened to protrusions on the inner wall of the housing, leaving no axial play. Consequently, the rotational stability of the filter wheel assembly is determined by the rotational performance of the first and second deep groove ball bearings. The bearings themselves have high precision and stability, significantly improving the rotational stability of the filter wheel assembly.

[0059] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention shall be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A stable filter device, characterized by: The invention comprises a frame (1), a box body arranged on the frame (1), a filter wheel motor (7) arranged outside the box body and mounted on the frame (1), and a filter wheel assembly (2), a filter wheel stopper (3), a limit assembly (4) and a driving gear (5) arranged in the box body; The box body comprises a box body and a box cover (9); the box body is fixedly connected to the frame (1), and the box cover (9) is installed on the front side of the box body, that is, at the opening of the box body; The filter wheel assembly (2) comprises a filter wheel (2-1), a bearing pin (2-2), a first deep groove ball bearing (2-3) and a second deep groove ball bearing (2-4); a plurality of filters (2-5) are mounted on the filter wheel (2-1), and a stopper notch is provided on the circumferential side wall thereof; the filter wheel stopper (3) is fixedly mounted in the stopper notch; The filter wheel motor (7) is located at the back of the box body, and its rotating shaft passes through the back of the box body and extends into the box body to be coaxially connected with the driving gear (5); A cylindrical protrusion is provided on the inner wall of the box body, the bearing nail (2-2) is axially inserted into the protrusion, and a bearing installation space is left between the nail head of the bearing nail (2-2) and the end surface of the protrusion; The first deep groove ball bearing (2-3) and the second deep groove ball bearing (2-4) are located in the bearing installation space and are sleeved side by side on the bearing nail (2-2), and the inner rings of the two are fixedly connected to the bearing nail (2-2); The filter wheel (2-1) is coaxially mounted on the first deep groove ball bearing (2-3), the second deep groove ball bearing (2-4) and the nail head, and is fixedly connected to the outer rings of the first deep groove ball bearing (2-3) and the second deep groove ball bearing (2-4), is loosely fitted with the nail head, and is also meshed with the driving gear (5); The limiting component (4) is located on one side of the circumferential surface of the filter wheel (2-1) and is installed on the inner wall of the box body, and its active end corresponds to the filter wheel stopper (3).

2. The stable filter device according to claim 1, characterized in that: An annular protrusion is provided on the inner wall of the filter wheel (2-1) connected to the first deep groove ball bearing (2-3) and the second deep groove ball bearing (2-4); A first annular notch is provided on the outer wall of the outer ring of the first deep groove ball bearing (2-3) on a side close to the second deep groove ball bearing (2-4); A second annular notch is provided on the outer wall of the outer ring of the second deep groove ball bearing (2-4) on a side close to the first deep groove ball bearing (2-3); When the first deep groove ball bearing (2-3) and the second deep groove ball bearing (2-4) are arranged side by side, the first annular notch and the second annular notch are spliced into an annular groove matching the annular protrusion, thereby achieving fixed connection between the filter wheel (2-1) and the outer rings of the first deep groove ball bearing (2-3) and the second deep groove ball bearing (2-4).

3. The stable operation filter device according to claim 1 or 2, characterized in that: The inner rings of the first deep groove ball bearing (2-3) and the second deep groove ball bearing (2-4) are interference fitted with the bearing pin (2-2); A gap of 0.1-0.3 mm is provided between the first deep groove ball bearing (2-3) and the second deep groove ball bearing (2-4).

4. The stable filter device according to claim 3, characterized in that: The filter wheel block (3) and the block notch are both L-shaped and are mounted to match each other so that one end of the filter wheel block (3) extends out of the block notch and corresponds to the active end of the limiting assembly (4).

5. The stable operation filter device according to claim 4, characterized in that: An arc-shaped avoidance notch is provided on the inner wall of the upper side of the box body, which is used for rotating and avoiding the end of the filter wheel stopper (3) extending out of the stopper notch.

6. The stable filter device according to claim 5, characterized in that: A top screw plane is provided on the side wall of the rotating shaft of the filter wheel motor (7); The driving gear (5) is provided with a top screw along its radial direction; the top screw is tightly fixed on the top screw plane.

7. The stable operation filter device according to claim 6, characterized in that: The tooth surface width of the driving gear (5) is 4-5 mm.

8. The stable filter device according to claim 7, characterized in that: The limit assembly (4) includes a limit bracket and a limit switch; The limiting bracket is installed on the inner wall of the box body; The limit switch is mounted on the limit bracket and corresponds to one end of the filter wheel stopper (3) extending out of the stopper notch.

9. The stable operation filter device according to claim 7, characterized in that: The filter (2-5) is mounted on the filter wheel (2-1) via a filter pressing ring (2-6); The filter wheel motor (7) is mounted on the frame (1) via a motor bracket (6); A detector trimming pad (8) is also press-fitted between the box body and the box cover (9).

10. A television camera with stable operation, characterized by: The invention comprises the stably operating optical filtering device according to any one of claims 1 to 9.

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