JP2000004384A - Slip ring for monitoring camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slip ring for monitoring camera provided with a contact piece which is high in productivity and stable in characteristics. SOLUTION: A contact piece 36 consists of a clad material 44 formed by press-joining a gold or gold alloy material 43 which is a contact to a conduction flat spring 42. In the clad material 44, two types of metallic materials are rolled by a roller and are press-jointed and therefore can be manufactured inexpensively with high productivity. The contact piece is formed into a fork shape and respective spring constants are changed, thereby two contact pieces can deal with various conditions. At high speed rotation, stable contact can be obtained by giving damping action to the contact pieces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating ring used for a surveillance camera and connected to an electric circuit on a rotating member side, and a contact piece connected to an electric circuit on a fixed member side and in contact with the rotating ring. And a slip ring having:

[0002]

2. Description of the Related Art Conventionally, surveillance cameras used in stores, banks, and the like have been set so that the direction of the camera is fixed and a certain predetermined range is monitored. Because of the inability to perform monitoring, a device has been developed that can monitor a wide area from a single point by combining a pan operation of rotating one camera horizontally and a tilt operation of rotating one camera vertically. . However, since the conventional surveillance camera is mounted on a ceiling or the like in a shape and state that can be clearly identified as a surveillance camera, it not only gives a well-intentioned person a sense of intimidation but is not preferable in terms of design. For this reason, a surveillance camera in recent years has been proposed in which the size is reduced so as not to be noticeable, and the camera part is covered with a dome cover to enhance the design. In order to reduce the size, a camera unit, a tilt mechanism unit, and a pan mechanism unit are combined in one place, and a structure in which the camera unit, the tilt mechanism unit, and the pan mechanism unit are separated from the power supply unit has been proposed.

FIG. 10 shows an example of such a conventional surveillance camera, which is described in Japanese Patent Publication No. 9-502331. In FIG. 10, reference numeral 101 denotes a pan motor base, which is fixed to a housing arranged behind a ceiling. 102 is a housing and a pan motor base 101
Between the electronic circuit board disposed in the housing and the tilt mechanism section and the camera section. Reference numeral 103 denotes a pan motor provided on the pan motor base 101, and a pulley 104 is fixed to a rotation shaft thereof. Reference numeral 105 denotes a timing belt, which is stretched between a pulley 104 and a pulley 106 fixed to a rotation shaft of the slip ring 102. Reference numeral 107 denotes an inverted L-shaped tilt motor base, the horizontal portion of which is fixed to the pulley 106. Reference numeral 108 denotes a tilt motor fixed to a vertical portion of the tilt motor base 107, and a pulley 109 is fixed to a rotation shaft thereof. Reference numeral 110 denotes a timing belt, which is stretched between the pulley 109 and the other pulley 111 fixed to the tilt motor base 107. 112 is the pulley 11
The camera is fixed to one rotation axis. These pan-tilt mechanisms are covered with a transparent or translucent dome.

Now, when the pan motor 103 rotates, the pulley 106 rotates via the pulley 104 and the timing belt 105, and the tilt motor base 107 fixed to the pulley 106 simultaneously rotates, and the camera 112 rotates in the horizontal direction. A pan operation is performed. Further, when the tilt motor 108 rotates, the pulley 111 rotates via the pulley 109 and the timing belt 110, and the camera 112 fixed to the pulley 111 rotates in the vertical direction to perform a tilt operation. The image captured by the camera 112 is converted into a digital signal,
02 to an external monitor.

FIG. 11 shows the structure of a conventional slip ring. In FIG. 11, a contact piece 121 is formed of a conductive leaf spring, and has a contact 122 made of gold or a gold alloy at the tip thereof.
Are spot welded. The base end of the contact piece 121 is bent and fixed to the fixed base 123, and the cable 124 is soldered and connected to the fixed-side electric circuit. The contact 122 at the tip is in contact with the rotating conductive ring 125. A plurality of conductive rings 125 axially adjacent to each other via an insulating spacer 126 are fixed to a rotating shaft 128 via an insulating ring 127, respectively.
A cable 129 is fixed through the inside of the device and is connected to an electric circuit on the rotating side.

[0006]

However, the above-mentioned slip ring has a problem that it is not suitable for mass production because the productivity is low because the contacts are spot-welded one by one to the contact pieces. . In addition, the contact pressure may change due to wear of the contact, and the characteristics may vary due to the eccentricity of the motor.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a slip ring of a surveillance camera having a highly productive and stable contact piece.

[0008]

In order to solve the above-mentioned problems, a slip ring according to the present invention has a contact piece formed of a conductive leaf spring material and a clad material in which gold or a gold alloy material serving as a contact is pressure-bonded. Things. Clad material is 2
Since various kinds of metal materials are rolled by rollers and pressure-bonded, high productivity can be achieved at low cost.
In the present invention, the contact pieces are formed in a bifurcated shape to change the respective spring constants, so that two contact pieces can cope with various conditions. In the present invention, the contact piece has a vibration damping action, and stable contact can be obtained even at high speed rotation.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention is a slip ring of a surveillance camera for electrically connecting a fixed power supply section and a rotating mechanism section having a camera section and rotating. A rotating ring connected to an electric circuit on the rotating mechanism side; and a contact piece connected to the electric circuit on the power supply section and in contact with the rotating ring, wherein the contact piece is a conductive leaf spring material. And a slip ring made of a clad material obtained by press-bonding a gold or gold alloy material serving as a contact point. The slip ring has a high productivity and can be manufactured at low cost.

According to a second aspect of the present invention, there is provided the slip ring according to the first aspect, wherein the contact portion of the contact piece is curved to be convex to one side. Has the effect that it can be brought into contact with the rotating ring.

According to a third aspect of the present invention, the contact pieces are formed in a multi-split shape, and the spring constants of the multi-split contact pieces are made different. Or the slip ring according to 2, wherein the same amount of deformation of the contact piece
There is an effect that various types of contact pressures can be obtained, and contact reliability is improved.

According to a fourth aspect of the present invention, in the slip ring according to the third aspect, the spring constant is changed by changing the width of each of the multi-split contact pieces. There is an effect that the spring constant can be changed even if the same leaf spring material is used.

According to a fifth aspect of the present invention, there is provided the slip ring according to any one of the first to fourth aspects, wherein a vibration suppressing material is used as a leaf spring material of the contact piece. The use of a vibration-suppressing material such as a vibration-damping steel plate has the effect of preventing contact pieces from rebounding and improving contact reliability.

According to a sixth aspect of the present invention, a vibration absorbing member is attached to the contact piece.
The slip ring according to any one of items 1 to 4, wherein the attachment of a vibration absorbing material such as rubber has an effect of preventing contact pieces from rebounding and improving contact reliability.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the contact piece is fixed by soldering to a pattern of a printed wiring board. 6. The slip ring according to any one of 6, wherein the slip ring has an effect that attachment of each contact piece and electrical connection can be performed simultaneously.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. First, the overall configuration of a surveillance camera including a slip ring according to the present invention will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a cylindrical resin power supply unit fixed to the ceiling, 2 denotes a cylindrical resin body detachably attached to the power supply unit 1, and 3 denotes a transparent resin dome fixed to the body 2. These are covers, and these form an outer shell of the surveillance camera. A power supply circuit board 4 is disposed inside the power supply unit 1, a power supply circuit connected to a commercial power supply is provided, and a coaxial cable is connected to take out a video signal and exchange control signals with a monitor. I have. A pan mechanism section P, a tilt mechanism section T, and a camera section C are arranged inside the body section 2 and the dome cover 3. The pan mechanism P includes a slip ring 6 fixed to the bottom plate 5 of the body 2, and a gear train 9 fixed to a pan shaft 7 of the slip ring 6 and a shaft 8 a of a pan motor 8. The gear train 9 includes the motor shaft 8
a, a pair of intermediate gears respectively fixed to an intermediate shaft orthogonal to this, and a worm and a worm gear fixed respectively to the intermediate shaft and a pan shaft 7 orthogonal thereto. The horizontal portion of the inverted L-shaped main frame 12 is fixed to the pan shaft 7 via a servo circuit board 10 and a rotating plate 11 so that the pan shaft 7 can rotate around the pan shaft 7.

A motor drive circuit board 13 and a tilt motor 14 are fixed to a vertical portion of the main frame 12, and a tilt shaft 15 is rotatably supported at a position away from the motor shaft 14a. Tilt motor 14
A gear train 16 is fixed to the shaft 14 a and the tilt shaft 15. The gear train 16 includes a motor shaft 14a.
And a pair of intermediate gears fixed to an intermediate shaft orthogonal to the shaft, a worm and a fan-shaped worm gear fixed to the intermediate shaft and a tilt shaft 15 orthogonal to the intermediate shaft. The tilt shaft 15 is fixed to a lens drive circuit board 17. The lens fixed circuit board 17 holds an imaging unit 18 having a CCD and a lens unit 19 including a plurality of lenses, and also has a digital circuit board 20 and a CC.
The D drive circuit board 21 is fixed. Also, the support pieces 11 stand up from four places around the upper rotating plate 11.
An inner dome 22 smaller than the dome cover 3 and formed of a translucent or opaque resin is fixed to a. The inner dome 22 is formed with an elongated opening 22a for allowing the lens portion 19 to move. The power supply circuit board 4 and the servo circuit board 10 are electrically connected via the slip ring 6, and the servo circuit board 10, the motor drive circuit board 13, the CCD drive circuit board 21, and the CCD drive circuit board 21
And digital circuit board 20 and lens drive circuit board 17
Are connected by a flexible cable.

The operation of the monitoring camera configured as described above will be described. This surveillance camera operates according to a program provided in advance by a memory provided on the digital circuit board 20 and the CPU. In the pan mechanism section P, the rotation of the pan motor 8 causes the main frame 12 to rotate together with the pan shaft 7 via the gear train 9, and causes the camera section C to continuously rotate 360 degrees in a horizontal plane via the main frame 12. . In the tilt mechanism T, the tilt motor 14 rotates to rotate the camera C by about 90 degrees in a vertical plane from right beside to right below. When rotating the camera unit C by about 180 degrees in the vertical plane, the camera unit C is moved from the side to the bottom, and then rotated 180 degrees by the pan mechanism unit P.
The tilt mechanism T is again moved from directly below to the side. Each time the pan and tilt move, focusing and zooming are performed by the autofocus function and the zoom function provided on the lens drive circuit board 17. The image captured by the lens unit 19 is converted into an electric signal by the imaging unit 18 controlled by the CCD drive circuit board 21, converted into a digital signal by the digital circuit board 20, and passed through the slip ring 6 from the servo circuit board 10. The video signal and the control signal are transmitted from the power supply circuit board 4 to an external monitor through a coaxial cable in which the video signal and the control signal are superimposed. In the outside monitor room, a watchman watches while watching the monitor TV,
By the operation of the observer, the pan and tilt angles can be arbitrarily set, and the zoom magnification of the lens unit 19 can be arbitrarily selected.

Next, the slip ring which is the subject of the present invention will be described. FIG. 2 shows a configuration of the slip ring 30 and corresponds to the above-described slip ring 6. The slip ring 30 has a flange portion 3 for mounting.
An outer shell is formed by a cylindrical housing 31 having 1a, and a shaft 32 corresponding to the above-mentioned pan shaft 7 is rotatably mounted via ball bearings 33 and 34 inside the outer shell. A contact piece fixing plate 35 is mounted inside the housing 31.
Are fixed with five contact pieces 36. One end of each cable 37 is soldered to each contact piece 36, and the other end of each cable 37 is connected to a connector 38. This connector 38 is connected to the power supply circuit board 4 described above.
A conductive rotating ring 39 is fixed to the shaft 32, and one end of a cable 40 is soldered to each rotating ring 39, and the other end of each cable 40 is connected to a connector 41. This connector 41 is connected to the servo circuit board 10 described above.

FIG. 3 shows the structure of the contact piece 36 in the above-described slip ring 30.
And a clad material 44 in which a gold or gold alloy material 43 is pressure-bonded to the leaf spring material 42. As shown in FIG. 4, the production of the clad material 44 is performed by rolling the leaf spring material 42 and the gold or gold alloy material 43 entirely as shown in FIG. 4A or as shown in FIG. (B). In the present embodiment, as shown in FIG. 3B, partial joining is performed, and this is cut finely in the vertical direction to form a contact made of gold or a gold alloy material 43 only at the tip.

FIG. 5 shows another example of the structure of the contact piece 36.
The contact piece 36A is formed by bending only one portion of the gold or gold alloy material 43 serving as the contact to one side by press working to form the convex portion 46, so that the contact can be surely brought into contact with the rotating ring. Can be.

FIG. 6 shows another example of the structure of the contact piece 36.
The contact piece 36B is formed in a forked shape by providing a slit 47 in the vertical direction from the contact side. This will cause the two contacts to contact one rotating ring,
The reliability of the contact can be increased. The width W1 and W2 of the contact pieces on both sides of the slit 47 may be the same, but different spring constants can be provided by making them different. Thereby, various conditions can be covered. For example, as shown in FIG. 7, if two types of springs having different relationships between the contact pressure and the spring displacement are prepared, two types of contact pressures can be obtained for the same amount of deformation, and the reliability of contact can be improved. Can be.

FIG. 8 shows another example of the structure of the contact piece 36. The contact piece 36C is obtained by adhering a vibration damping material 48 such as a rubber damper on the leaf spring material 42. By damping the vibration, a stable contact can be obtained even when the rotating ring is rotating at high speed. Is obtained. Such a vibration damping material 48
The same effect can be obtained even if the leaf spring material 42 itself is made of a damping material such as a damping steel plate instead of attaching the.

FIG. 9 shows another example of the structure for fixing the contact piece 36. Reference numeral 49 denotes a printed wiring board, on which a circuit pattern 50 is formed. A through hole 51 is formed in the land portion 50a of the circuit pattern 50, and the contact piece 3 is formed in the through hole 51 from the back side.
By inserting the protrusion 52 provided on 6D and soldering from the front side, the contact piece 36D is fixed to the printed wiring board 49. Then, by connecting the edge connector 52 to the circuit pattern 50, the cable 37 in FIG. 2 can be omitted.

[0025]

As described above, the slip ring according to the present invention has a contact piece made of a clad material in which gold or a gold alloy material serving as a contact is joined to a conductive leaf spring material by pressure bonding. Since two kinds of metal materials are rolled by rollers and pressure-bonded, the productivity is high and the production can be performed at low cost. In the present invention, the contact pieces are formed in a forked shape to change the spring constant of each contact piece, so that two contact pieces can cope with various conditions. In the present invention, the contact piece has a vibration damping action, and stable contact can be obtained even at high speed rotation.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a configuration of a surveillance camera according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional perspective view showing a configuration of a slip ring according to the embodiment of the present invention.

FIG. 3 is a partial perspective view of a contact piece according to the embodiment of the present invention.

FIG. 4 is a schematic perspective view showing a method for manufacturing a contact piece according to the embodiment of the present invention.

FIG. 5 is a partial perspective view of another contact piece according to the embodiment of the present invention.

FIG. 6 is a partial perspective view of still another contact piece according to the embodiment of the present invention.

7 is a characteristic diagram showing a relationship between a spring displacement of a contact piece shown in FIG. 6 and a contact pressure.

FIG. 8 is a partial perspective view of still another contact piece according to the embodiment of the present invention.

FIG. 9 is a perspective view showing another contact piece mounting structure according to the embodiment of the present invention.

FIG. 10 is a schematic perspective view showing the configuration of a conventional surveillance camera.

FIG. 11 is a schematic perspective view showing the configuration of a conventional slip ring.

[Explanation of symbols]

 Reference Signs List 1 power supply section P pan mechanism section T tilt mechanism section C camera section 6, 30 slip ring 31 housing 32 shaft 33, 34 ball bearing 35 contact piece fixing plate 36 contact piece 37 cable 38 connector 39 rotating ring 40 cable 41 connector 42 leaf spring Material 43 Gold or gold alloy material 44 Clad material

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshifumi Yano 4-3-1 Tsunashimahigashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (72) Inventor Noboru Takada Kohoku-ku, Yokohama-shi, Kanagawa Prefecture 4-1, Tsunashima Higashi 3-1, Matsushita Communication Industrial Co., Ltd. F-term (reference) 2H105 EE08 EE35 5C022 AA01 AB65 AB66 AC01 AC27 AC42 AC63 AC70 AC74 AC75 AC77

Claims (7)

[Claims] 1. A slip ring of a surveillance camera for electrically connecting a fixed power supply section and a rotating mechanism section provided with a camera section and rotating, the rotating ring being connected to an electric circuit on the rotating mechanism section side. And a contact piece that is connected to an electric circuit on the power supply unit side and contacts the rotating ring, wherein the contact piece is
A slip ring comprising a clad material in which gold or a gold alloy material serving as a contact is pressure-bonded to a conductive leaf spring material. 2. The slip ring according to claim 1, wherein a contact portion of the contact piece is curved so as to protrude to one side. 3. The slip ring according to claim 1, wherein the contact pieces are formed in a forked shape, and the spring constant of each of the forked contact pieces is made different. 4. The slip ring according to claim 3, wherein the spring constant is changed by changing the width of each of the multi-branched contact pieces. 5. The slip ring according to claim 1, wherein a vibration suppressing material is used as a leaf spring material of the contact piece. 6. The slip ring according to claim 1, wherein a vibration absorbing material is attached to the contact piece. 7. The slip ring according to claim 1, wherein the contact piece is fixed to the printed wiring board by soldering.