KR100875223B1 - Magnetic slipling and monitoring camera with the same - Google Patents

Abstract

A magnetic slip ring and a monitoring camera with the same are provided to have an additional coupling unit for coupling a magnet for hole sensing in a core lower portion of the slip ring, thereby realizing easy assembly with the magnet. A core(110) is electrically connected to one side wiring connected with a rotation member. An inner housing(120) includes a core. An external housing(130) is supported at a fixing member while rotatably supporting the inner housing. A blush is electrically connected to another wiring connected to the fixing member while maintaining an electric connection state with the core through the inner housing. A magnet induces a change of magnetic flux in a hole sensor side to sense rotation of a core by the hole sensor.

Description

Magnetic slip ring and monitoring camera with the same

The present invention relates to a magnetic slip ring capable of infinite rotation around a rotating shaft and a surveillance camera capable of precisely correcting and controlling the attitude of the camera even through slip caused by an external fine impact through the slip ring.

In general, surveillance cameras are used to prevent theft of goods in crowded places such as houses, department stores, banks, exhibition halls, and the like.

The surveillance camera is installed on a high ceiling or wall out of reach of humans to capture a surveillance area with a video camera. The administrator monitors the captured screen by displaying it on a monitor installed in an office, and if necessary, records only a desired scene using a video cart recorder (VCR).

As described above, the surveillance camera is generally designed such that the camera has a tilting function and a panning function to monitor various and wide areas. Here, the tilting function refers to a function of rotating the camera in the up and down directions, and the panning function refers to a function of rotating the camera in the horizontal direction.

As shown in FIG. 1, the surveillance camera 10 includes an upper frame 1 forming an appearance, a fan base 2 horizontally installed inside the upper frame 1, and an upper portion of the fan base 2. The fan motor (3) through the installed fan motor (3), the tilt support (4) installed on the bottom of the fan base (2), the tilt motor (5) installed on the tilt support (4), and the tilt support (4). ) And a camera 6 which is axially connected to the tilt motor 5 so as to allow panning and tilting at the same time, and a dome-shaped cover 7 surrounding the outside of the camera 6.

The fan motor 3 and the tilt motor 5 are stepping motors of which the speed can be varied, and the rotational direction of the motor and the speed of the motor are changed according to the step (ie, driving pulse) output from the control unit 8. Will be adjusted.

And the surveillance camera 10 configured as described above is monitored so that the twisting of the various wires wired to the fixed part and the rotating part of the surveillance camera 10 when the camera 6 inside the cover 7 is panned or tilted. The fixed part and the rotating part of the camera are connected via the slip ring 20.

In general, the slip ring 20 is a device that allows the electrical circuit of the rotating part and the electric circuit of the fixed part to be connected without twisting the wiring during the rotation, and forms a variety of structures depending on the intended use. Recently, due to the miniaturization trend and the development of functions of various electronic devices, it is required to reduce the size and precision of the slip ring itself by transmitting multiple complex signals simultaneously.

Such a slip ring requiring compactness and precision is mainly applied to automation equipment such as surveillance cameras, index tables, robot systems, medical equipment, heater rolls, and various measuring equipment.

As shown in Figures 2 to 4, the conventional slip ring 20 is coupled to each other as a plurality of internal housing 21 for branching the wiring connected from one side to the other side and a plurality of the internal housing ( 21 is coupled to the outer housing 22 for fixing it, the snap ring 23 for fixing the outer housing 22 and the inner housing 21, and one side wiring 24 connected from the rotating member (not shown) The core 25 for transmitting the electrical signal transmitted through the brush, the brush 26 is fixed to the inside of the inner housing 21 to transmit the electrical signal applied from the core 25, and the brush ( 26 is connected to the other side wiring (27a, 27b, see Fig. 4) is fixed to the fixing member (not shown), one side wiring 24 and the core 25, and the core The fixing part 29 fixed to the other side of the 25 and the first bearing fastened to the outside of the connecting portion 28 ( 30 and a second bearing 31 fastened to the other side of the fixing part 29.

Here, the core 25 has an inner circumferential surface and an outer circumferential surface, and one side wiring 24 connected to the pivot member is connected through an inner circumferential surface to output electrical signals transmitted from the one side wiring 24 from the outer circumferential surface. An insulator 32a for blocking the conduction of electrical signals between the conductors 32b and 32c and the plurality of conductors 32b and 32c. At this time, each of the conductors 32b and 32c of the core 25 is connected to one side wiring 24 connected to the pivot member to output a signal transmitted from each wiring 24 (see FIG. 3).

In addition, the connection portion 28 forms a space in which one side wiring 24 connected to the pivot member from the inside into the core 25 is formed inside, and the first bearing 30 is fastened to an outer circumferential surface thereof. The other side of the core 25 is fixed to the fixing part 29, and the second bearing 31 is fastened to an outer circumferential surface thereof.

The brush 26 is a conductor that is divided into and fixed to the plurality of internal housings 21a and 21b, respectively, and the plurality of ends fixed in the inner housing 21 and penetrated to the lower side are the cores. The outer circumferential surfaces of the conductors 32b and 32c of (25) are contacted. In this case, the brush 26 is connected to the other wirings 27a and 27b inside the inner housing 21, respectively.

A plurality of brushes 26a fixed to the first housing 21a in the inner housing 21 are respectively connected to the first other wiring 27a and a plurality of brushes fixed to the second housing 21b ( 26b) is connected to the second other side wiring 27b, so that one side wiring 24 connected to the rotating member is connected in a whole bundle, but the other side wirings 27a and 27b are half-bundled in the slip ring 20. Branching to each other is connected to the fixing portion 29.

The outer housing 22 is fastened at the outside of the plurality of inner housings 21a and 21b in which the core 25, the brush 26, the connecting portion 28, and the fixing portion 29 are accommodated and fastened to the inside thereof. It includes a snap ring fixing groove in which the snap ring 23 is seated on the inner peripheral surface of the one side.

Description of the working relationship with respect to the conventional slip ring including the above configuration is as follows.

The slip ring 20 is a video signal photographed on the side of the control unit (fixed member) in which the surveillance camera is rotated in all directions to shoot an image in a certain area and output the image captured by the situation room or the surveillance camera. When mounted to the system for transmitting the, the core 25 is interlocked when one side is connected to the surveillance camera side when the surveillance camera is rotated, the brush 26 is fixed in the surveillance camera The photographed signal transmitted is received through the conductors 32b and 32c of the core 25 and transmitted to the other wirings 27a and 27b connected to the control structure.

At this time, the core 25 is drawn from one side through the connecting portion 28, for example, the wires through which the imaging signal of the surveillance camera is transmitted to the inner peripheral surface of the conductors (32b, 32c) respectively solder or other adhesive means It is connected one-to-one through to form a contact 32d, through which the received electrical signal is transmitted to the brush 26 in contact with the outer peripheral surface.

The brush 26 is fixed as one brush 26a and the other brush 26b which are respectively fixed in the plurality of divided internal housings 21, and the one brush 26a and the other brush 26b are zigzag. In order, the signals output by contacting the conductors 32b and 32c of the core 25 are transmitted to the other wirings 27a and 27b connected from above.

Conventional surveillance cameras do not have a position correction function that can detect the pan driver and the tilt driver due to external shocks (fine panning and tilting), even if an error occurs in the camera's position, or accurately set it to its original position. Therefore, there was a problem that can not perform the correct monitoring function.

On the other hand, the optical encoder method that detects the position error by using the reflection or transmission property of light is expensive to manufacture, and the optical method is vulnerable to dust or foreign matter, and the higher the accuracy of error detection, the larger the volume of the device. It is not widely used because of its own problems.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described conventional problems, and provides a magnetic slip ring capable of detecting fine slips, and a surveillance camera capable of accurately performing positional correction of a camera according to slips while having a magnetic slip ring. The purpose is to.

In order to achieve the above object, the magnet slip ring according to the present invention supports a core electrically connected to one side wiring connected to a rotating member, an inner housing in which the core is housed, and a rotatably supporting the inner housing. Coupled to the outer housing, the brush is electrically connected to the other wiring connected to the fixing member while maintaining a state of being electrically connected to the core through the inner housing, and separate when the Hall sensor is located to be spaced apart from the lower end of the core It is coupled to the lower end of the core through the means is configured to include a magnet for inducing a magnetic flux change on the hall sensor side so that the Hall sensor can detect the rotation of the core, the coupling means is accommodated in the magnet on the top A lower portion of the core corresponding to a threaded portion of the container and a threaded portion of the container; In that the helical groove formed in the features.

In addition, the present invention is a surveillance camera having a magnet slip ring as described above, wherein the core of the slip ring is respectively coaxially connected to the fan drive shaft or the tilt drive shaft of the camera, the fixing member detected by the Hall sensor A control circuit board for receiving data and transmitting an operation signal to a step motor side connected to the fan drive shaft and the tilt drive shaft is fixed, and the control circuit board is connected to a control module for controlling the operation of the step motor.

According to the magnetic slip ring according to the present invention configured as described above, a separate coupling means is provided so that the magnet for the hole sensing is coupled to the lower portion of the core of the slip ring, it is easy to assemble with the magnet have.

In addition, according to the monitoring camera having a magnetic slip ring according to the present invention, even if the camera slips due to external shock, the slip detection and position correction is performed through the hall sensing, so that the reliability of the attitude control of the camera together with the slip detection accuracy is improved. It is greatly improved and the size of the camera can be made compact.

The features and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are defined in the technical spirit of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. It must be interpreted to mean meanings and concepts.

DETAILED DESCRIPTION Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. Like reference numerals refer to like elements, and only different parts will be mainly described so as not to overlap for clarity.

The present invention focuses on the Hall effect in which a potential difference is generated perpendicularly to the direction of the current and the direction of the magnetic field by flowing a magnetic field in a vertical direction after the current flows through the electrode of the semiconductor, which occurs in the panning and tilting driving portions of the camera. The hall sensor detects the slip phenomenon through the slip ring to precisely control the position of the camera.

Therefore, the surveillance camera according to the present invention is basically manufactured to perform at least one or more of panning or tilting, and includes a hall sensor and a magnet slip ring to enable hall sensing. In this embodiment, a monitoring camera configured to perform both panning and tilting operations is illustrated and described as an example.

As shown in FIG. 5, the magnet slip ring 100 has a core 110 electrically connected to one side wiring 24 connected to a rotating member (not shown). The core 110 is accommodated in the inner housing 120, and the inner housing 120 is rotatably supported together with the core 110 by an outer housing 130 fixed to a fixing member (not shown). The brush is electrically connected to the other wirings 27a and 27b connected to the fixing member while maintaining a state of being electrically connected to the core 110 through the inner housing 120. The magnet M is coupled to the lower end of the core 110 so as to rotate together with the rotating core 110. In this embodiment, the rotating member is a camera.

According to the present invention, as shown in Figure 6, the magnet (M) is coupled to the lower end of the core 110 so that the center thereof is located on the same line as the rotation axis of the core 110, the core 110 When the Hall sensor (S) is located to be spaced apart from the lower end of the, the Hall sensor (S) to induce a magnetic flux change on the Hall sensor (S) side to detect the rotation of the core (110).

And the magnet (M) is easily coupled with the core 110 through a separate coupling means. As shown in FIG. 7, the coupling means has a magnet (M) is received inward and the upper end of the container 151 with the threaded portion 152 protruded, the corresponding to the threaded portion 152 of the container 151 It is a spiral groove 153 formed at the bottom of the core 110. In this case, the exchange of the magnet M becomes much easier than the case where it is bonded or press-fitted in the receiving groove 140.
On the other hand, the coupling means may be a magnet receiving groove 140 formed at the bottom of the core 110. In this case, the lower end of the outer housing 130 and the lower end of the inner housing 120 may be opened so that the magnet (M) is easily inserted into the magnet receiving groove 140 from the outside. The core 110 may be adhered to the receiving groove 140 to be prevented from being separated from the receiving groove 140, or may be pressed into the receiving groove 140.

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On the other hand, the lower portion of the outer housing 130 is provided with a support means 160 so that the magnet (M) to maintain the spaced state in a horizontal state with the Hall sensor (S).

5 to 7, the support means 160 includes a plurality of elastic protrusions 161 protruding from the lower end of the outer housing 130 in a direction perpendicular to the hall sensor S, and the elastic protrusions. It may be a plurality of engaging grooves 162 formed on both sides of the Hall sensor (S) to be elastically coupled to the (161). In addition, although not shown, the support means 160 includes a plurality of elastic protrusions 161 protruding from the lower end of the outer housing 130 in a direction perpendicular to the hall sensor S, and the respective elastic protrusions 161. ) May be a plurality of engaging holes 163 formed in the upper portion of the hall sensor S to be inserted.

On the other hand, at least one side of the top or bottom of the core 110 is preferably a bearing 170 made of a non-magnetic material fastened to the inner peripheral surface of the inner housing 120 is further installed. The non-magnetic material of the bearing 170 is intended to prevent dispersion and interference of the magnetic flux of the magnet M under the core 110.

Surveillance camera 200 according to the present invention is provided with a magnet slip ring 100 of such a configuration.

As shown in Figure 8 and 9, the surveillance camera 200 is basically the upper frame 211 forming the appearance, the fan base 212 is installed horizontally in the upper frame 211 and the fan The fan motor 213a installed on the base 212, the tilt support 214 installed on the bottom of the fan base 212, the tilt motor 213b installed on the tilt support 214, and the tilt support 214 It is connected to the fan motor 213a and the tilt motor 213b through the camera 215 and the fan driving shaft 215a and the tilt driving shaft 215b of the camera 215 installed to allow panning and tilting at the same time. A magnet slip ring 100, a Hall sensor S positioned in the fixing member so as to be spaced apart from the lower end of the slip ring 100, and a dome shaped cover 216 surrounding the outside of the camera 215. .

The other components except for the magnet slip ring 100 and the hall sensor S are the same as or similar to those of the conventional configuration, and thus the detailed description thereof will be omitted.

The fan motor 213a and the tilt motor 213b are suitable for stepping motors operated according to driving pulses to increase the accuracy of the operation. The rotation shafts of the fan motor 213a are belts 217 on the fan driving shaft 215a. Is connected through the transfer of the rotational force of the fan motor (213a) to the fan drive shaft (215a). The same applies to the tilt motor 213b.

Each of the magnet slip rings 100a and 100b is connected to each driving shaft 215a and 215b of the camera 215. That is, the core 110 is electrically connected to one side wiring connected to the camera 215, and is coaxially connected to the fan driving shaft 215a or the tilt driving shaft 215b of the camera 215, respectively. Is electrically connected to the other base wire connected to the fan base 212 or the tilt support 214 while maintaining the state electrically connected to the core 110 through the inner housing 120.

therefore, When a slip occurs in the tilting driving part or the panning driving part due to the external impact of the camera 215, the slip detection and the position correction according to the slip are made through the hall sensor S.

The hall sensor S is made of elements whose internal resistance is changed by a magnetic field that changes according to the Hall effect, and is spaced apart from the lower end of the slip ring 100. The Hall sensor S may be mounted in a state in which it is mounted on a control circuit board 218 installed on the outer housing 130 or a control circuit board 219 installed on the tilt bracket 214, and the slip ring 100. It may be detachably coupled to the bottom of the outer housing 130. As such, when the hall sensor S is coupled to the lower end of the outer housing 130 of the slip ring 100, the hall sensor S should be connected to the control circuit board through a separate connector.

In this embodiment, the Hall sensor S installed on the tilt driving shaft 215b is detachably coupled to the lower end of the outer housing 130 of the slip ring 100, and the Hall sensor S installed on the fan driving shaft 215a is a control circuit. The mounting on the substrate 218 is shown as an example.

In addition, in the present embodiment, the slip ring 100 is illustrated and described, for example, installed on both the fan driving shaft 215a and the tilt driving shaft 215b. It may be attached.

On the other hand, when the support means 160 is provided at the lower portion of the outer housing 130 of the slip ring 100 to keep the magnet M in a horizontal state with the Hall sensor (S) in a horizontal state. The Hall sensor S is easily assembled with the slip ring 100.

The control circuit boards 218 and 219 are connected to a control module (not shown) that receives data detected by the hall sensor S. The control module transmits an operation signal to the fan motor 213a and the tilt motor 213b connected to the fan driving shaft 215a and the tilt driving shaft 215b to control the operation of the fan motor 213a and the tilt motor 213b. do. The microcontroller is suitable as the control module.

As described above, the hall sensor S to be connected to the driving shaft of the camera 215 is a very important technical feature in the present invention, which can detect fine slip of the camera 215 and perform position correction very precisely. To do so. That is, when the slip ring 100 is installed in the slip ring 100 in the fan motor 213a or the tilt motor 213b, the basic operation such as slip detection or position correction can be performed. In the process of transmitting the rotation amount of the drive shaft in which the belt 217 connecting the slip to the rotating shaft of the motor is finely slipped, the Hall sensor S for detecting the movement of the slip ring 100 installed on the rotating shaft of the motor is a camera ( This is because the exact slip amount of 215 cannot be detected. In addition, even if the slip amount of the drive shaft is correctly transmitted to the rotating shaft of the motor, the camera has a fundamental problem that the drive pulse is lost during driving due to the characteristic of the stepping motor operating according to the drive pulse. This is because the position correction of the camera 215 cannot be made precisely because the 215 cannot be moved accurately.

Surveillance camera 200 of the present invention having such a configuration is the slip shaft is generated in the fan drive shaft 215a and the tilt drive shaft 215b of the camera 215 by an external impact, if the set position is changed, the drive shaft As the cores 215a and 215b rotate, the core 110 of the slip ring 100 rotates, and the magnet M mounted below the core 110 rotates along the core 110. Therefore, the magnet M is always rotated at the same rotation angle as the corresponding drive shafts 215a and 215b.

When the magnet (M) is rotated, the hall sensor (S) detects this. When the magnet M is rotated, the magnetic flux is changed, and the resistance value of the element constituting the Hall sensor S is changed by the change of the magnetic flux, so that the Hall sensor S can detect fine slip.

The resistance change data obtained by the hall sensor S is transmitted to the microcomputer, and the microcomputer analyzes the transmitted data to drive the drive shafts of the fan motor 213a and the tilt motor 213b so as to rotate by an appropriate angle, respectively. 215) correct the position.

Meanwhile, the microcomputer preferably receives data transmitted in real time from the hall sensor S while analyzing the position of the camera 215 and analyzes the data to continuously correct the position of the camera 215. In this case, an error due to slipping of the belt 217 occurs in the power transmission process between the motor and the drive shaft, or a change in acceleration / deceleration or rotation direction of the fan motor 213a and the tilt motor 213b (for example, clockwise direction). Even if a loss of the driving pulse occurs due to a change in the counterclockwise direction), the position correction of the camera 215 in the correct posture is always possible.

On the other hand, when the slip is detected, the microcomputer instantly increases the holding currents of the fan motor 213a and the tilt motor 213b to generate a large torque, thereby preventing further slip. Therefore, since slip is suppressed as much as possible, it is possible to secure stability corresponding to shock or vibration.

1 is a cross-sectional view of a conventional surveillance camera.

2 is a conventional slip ring appearance view.

3 is a side cross-sectional view of a conventional slip ring.

4 is a longitudinal cross-sectional view of a conventional slip ring

5 is a cross-sectional view of the magnetic slip ring according to the present invention.

Figure 6 is an exploded perspective view showing some of the configuration of the magnetic slip ring according to the present invention.

7 is a sectional view according to another embodiment of the magnetic slip ring according to the present invention;

8A to 8C are exploded perspective views of main parts of a surveillance camera each having a magnetic slip ring according to the present invention;

9 is a partially exploded perspective view for showing the configuration of a surveillance camera having a magnetic slip ring according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100.Magnet slip ring 110.Core

120 Internal housing 130 External housing

140.Magnet receiving groove 152 ... Thread

151 ... receptor 153 ... spiral

160.Supporting means 161.Elastic protrusion

162.Locking groove 170 ... Bearings

200 Surveillance Camera 213a Fan motor

213b.Tilt motor 214.Tilt bracket

215 Camera ... 215a Fan drive shaft

Tilt drive shaft 218,219 Control circuit board

S ... Hall sensor M ... Magnet

Claims (12)

A core electrically connected to one side wiring connected to the rotating member, an inner housing accommodating the core, an outer housing supported by the fixing member while rotatably supporting the inner housing, and electrically connected to the core through the inner housing. When the Hall sensor is positioned so as to be spaced apart from the lower end of the core and the brush is electrically connected to the other wiring connected to the fixing member while maintaining the connected state, the Hall sensor is coupled to the lower end of the core through a separate coupling means. In the magnet slip ring having a magnet for inducing a magnetic flux change on the hall sensor side to detect the rotation of Magnet coupling ring is characterized in that the magnet is accommodated inward and comprises a threaded protrusion formed on the upper end and a spiral groove formed in the lower end of the core corresponding to the threaded portion of the receptor. delete delete The method of claim 1, A magnet slip ring, characterized in that the lower portion of the outer housing is provided with a support means for keeping the magnet in a horizontal state with the hall sensor in a horizontal state. The method of claim 4, wherein The support means is a magnet slip ring, characterized in that the plurality of elastic projections protruding at the lower end of the outer housing in a direction perpendicular to the Hall sensor, and a plurality of engaging grooves formed on both sides of the Hall sensor to be elastically coupled to the elastic projection. . delete The method of claim 1, At least one side of the upper or lower end of the core magnet slip ring, characterized in that the bearing is made of a non-magnetic material fastened to the inner peripheral surface of the inner housing is further installed. A core electrically connected to one side wiring connected to a camera performing at least one of panning and tilting, an inner housing in which the core is housed, an outer housing supported by a fixing member while rotatably supporting the inner housing, The core is electrically connected to the core through the inner housing and electrically connected to the other wire connected to the fixing member, and the core is provided through a separate coupling means when the hall sensor is positioned to be spaced apart from the lower end of the core. It is coupled to the lower end of the Hall sensor having a magnet for inducing a magnetic flux change on the Hall sensor side to detect the rotation of the core; In the coupling means is a surveillance camera having a magnet slip ring to be accommodated in the inner side and a screw groove formed on the upper end of the core and the spiral groove formed in the lower end of the core corresponding to the threaded portion of the receiver, Cores of the slip ring are respectively coaxially connected to the fan drive shaft or the tilt drive shaft of the camera, The control member is fixed to the fixing member for receiving the data detected by the Hall sensor and transmitting the operation signal to the step motor side connected to the fan drive shaft and the tilt drive shaft, And the control circuit board is connected to a control module for controlling the operation of the step motor. The method of claim 8, The control module is a surveillance camera having a magnet slip ring, characterized in that the microcomputer. The method according to claim 8 or 9, The control module is a monitoring camera having a magnet slip ring, characterized in that when the slip is sensed to increase the holding current of the fan motor and the tilt motor instantaneously to generate a large torque so that no further slip occurs. The method of claim 8, The hall sensor is a surveillance camera having a magnet slip ring, characterized in that detachably coupled to the bottom of the outer housing of the slip ring. The method of claim 8, The hall sensor is a surveillance camera having a magnet slip ring, characterized in that mounted on the control printed circuit board.

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