JP3792828B2 - Cable winding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cable winding device for winding a cable including a power supply line or a signal line such as a control signal or a video signal in an electronic device or the like.
[0002]
[Prior art]
Conventionally, for example, in an electronic device such as a video camera, it is possible to wind a cable having a power supply line, a signal line such as a control signal, and a video signal by rotating the reel part with respect to the fixed-side main body part. A cable take-up device is known.
[0003]
Such a cable winding device or electronic device has a rotatable electrical contact so that electrical connection can be made even if the reel portion is rotated with respect to the stationary main body portion. Generally in this type of conventional device, ring-shaped contacts are arranged on one side along concentric circles for the number of connecting lines centered on the rotation axis of the reel portion, and pin-shaped at the position corresponding to each ring-shaped contact on the other side. A contact is provided.
[0004]
FIG. 5 shows an example of the configuration of a conventional cable winding device, particularly an example of the structure of a rotatable electrical contact. FIG. 5 is a view of the contact on the reel portion side as seen from the stationary main body portion in the same direction as the rotation axis. In the figure, reference numeral 2 denotes a reel portion which can be rotated around a rotation axis O. 6a to 6j are reel side contacts configured in a ring shape on a plane perpendicular to the rotation axis O, and 8a to 8j are pin-shaped main body side contacts arranged corresponding to the reel side contacts 6a to 6j. is there.
[0005]
FIG. 5 shows a case where the number of lines to be connected is ten. Since the ten ring-shaped reel side contacts 6a to 6j are arranged concentrically as shown in the figure, the diameter D of the reel portion 2 is required. Further, the pin-shaped fixed-side main body contacts 6a to 6j are arranged in the diameter direction passing through the rotation axis O so as to correspond to the reel-side contacts 6a to 6j, respectively. In this case, in order to shorten the width of one contact point and average the contact pressure applied to the entire contact point, the contact points are divided into upper and lower portions every other line. With this configuration, even if the reel portion is rotated to wind the cable, the electrical connection is not impaired.
[0006]
[Problems to be solved by the invention]
However, the conventional example has a problem that the diameter D of the contact portion increases as the number of lines to be connected increases. For this reason, it has been substantially difficult to realize a small-sized cable winding device that can wind a cable including multiple lines. Further, when connecting a large number of lines, the diameter D of the contact portion increases, and the flatness of the reel side contact is easily broken by the contact pressure of the fixed body portion contact. As a result, there is a problem that poor contact of the contacts easily occurs.
[0007]
Further, in the above-described conventional example, the types of lines included in the cable are minute and high-speed signal lines such as video signals and control signals to the microcomputer. In the case of such a line, if the reel portion is rotated during power transmission to the line, the signal is destroyed due to a so-called chattering phenomenon that occurs at the contact portion, and problems such as noise and control failure occur.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cable winding device that can effectively cope with the increase in the number of lines of a cable and that is small in size and ensures proper operation.
[0009]
[Means for Solving the Problems]
The cable winding device of the present invention is a cable winding device having a plurality of pairs of electrical contacts that can rotate relative to each other between a rotating reel portion for winding a cable and a stationary main body portion, and one of each pair of electrical contacts. Are arranged on the same circumference around the rotation axis of the rotary reel unit, and the other side of each electrical contact pair is arranged so as to be in contact with the one side so that each electrical contact pair is at a fixed rotational phase position. Is to be connected.
[0010]
The cable winding device of the present invention is characterized in that one side of each electrical contact pair is provided on the rotating reel part and the other side is provided on the fixed body part.
Further, the cable winding device of the present invention is characterized in that it has positioning means capable of fixing the rotary reel portion at a fixed rotational phase position.
Further, the cable winding device of the present invention is characterized in that it has connection control means for enabling connection of each electrical contact pair only when the rotary reel portion is fixed at a fixed rotational phase position.
In the cable winding device according to the present invention, the connection control means can selectively connect a plurality of pairs of electrical contacts.
[0011]
Alternatively, the video camera of the present invention is a video camera in which a camera body and a camera unit are connected via a cable, and the cable winding device according to any one of claims 1 to 5 is provided at an appropriate position of the camera body. The cable is wound around the cable winding device.
In the video camera of the present invention, the cable includes at least a power supply line, a control signal line, and a video signal line.
In the video camera of the present invention, the connection control means is provided, and the connection control means can selectively connect any one of a power supply line, a power supply line, and a control signal line.
[0012]
According to the present invention, it is possible to realize a small cable winding device that enables uniform contact of the contact portion without increasing the diameter of the contact portion even when the number of cable lines is large. Accordingly, a stable electrical connection can be achieved while being small.
In addition, according to the present invention, even when the cable is wound or pulled out by mistake during power transmission to the cable and the reel portion is rotated, the wrong contact is not connected. In other words, the proper operation of the device can always be guaranteed.
In addition, according to the present invention, it is possible to effectively realize a small cable winding device even when a power source and a signal line are mixed.
Further, according to the present invention, it is possible to realize an inexpensive apparatus by providing the connection means only on a necessary part of the lines to be connected.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a cable winding device according to the present invention will be described with reference to FIGS.
FIG. 1 is a side sectional view of a cable winding device according to this embodiment, and FIG. 2 is a view of a fixed-side main body with the reel portion removed from the cable winding device as viewed from the reel portion side in the same direction as the reel rotation shaft. FIG. 3 is a view of the reel portion in a state where it is removed from the fixed-side main body portion of the cable winding device, as viewed from the fixed-side main body portion side in the same direction as the reel rotation shaft.
[0014]
In each figure, 1 is a fixed side main body part, 2 is a reel part, 3 is a cable including a plurality of lines such as a power source and a signal line, 4 is a retaining member for the reel rotating shaft, 5 is a retaining member for the cable 3, 6 is a reel side contact, 7 is a substrate for holding the reel side contact 6, 8 is a main body side contact, and 9 is a contact base for the main body side contact 8. 10 is a contact spring, 11 is a contact board, 12 is a lead wire connected to the electric circuit of the main body 1, 13 is a lock member of the reel unit 2, 14 is a lock spring, 15 is a rotating shaft of the lock member 13, and 16 is a lock A detection switch 17 is a lead wire of the lock detection switch 16.
[0015]
In FIG. 1, a current such as a power supply or a control signal supplied from an electric circuit (not shown) of the main body 1 is supplied to the pattern portion 11 a on the contact substrate 11 through the lead wire 12. From the pattern portion 11a, a current is supplied to the main body side contact 8 via a conductive contact spring 10 attached so as to elastically bias the main body side contact 8. Since the main body side contact 8 is biased by the contact spring 10 so as to maintain an appropriate contact pressure with respect to the reel side contact 6, the current supplied to the main body side contact 8 loses any loss due to contact resistance. It is transmitted to the reel side contact 6 without receiving.
[0016]
The reel side contact 6 is connected to an extension 3 a for each individual line in the cable 3. As a result, the current supplied from the electric circuit of the main body 1 can be transmitted to the device attached to the end of the cable 3 via the cable 3 without loss.
[0017]
By the way, the cable 3 is in a state of being wound around the reel portion 2 and the shaft portion 2a of the reel portion 2 is fitted to the bearing portion 1a of the fixed-side main body portion 1 so as to be rotatable around the rotation axis O. is doing. For this reason, the cable 3 can be freely wound and pulled out by rotating the reel 2 using the handle 2d of the reel 2.
Further, the cable 3 is drawn inside the reel portion 2 through the hole portion 2b of the reel portion 2 at the innermost circumference wound around the reel portion 2 several times. Since the retaining member 5 is fixed to the cable 3 inside the reel portion 2, the reel portion 2 will not come out even if the cable 3 is pulled out.
[0018]
On the outer peripheral portion of the reel portion 2, two lock grooves 2 c into which the claw portions 13 a of the lock member 13 can enter are provided at positions opposed to each other by 180 °. The lock member 13 is constantly pressed against the outer peripheral portion of the reel portion 2 by the lock spring 14. Only when the reel side contact 6 comes to a predetermined position corresponding to the main body side contact 8, the lock member 13 engages with the lock groove 2c. In this embodiment, when the two locking grooves 2c opposed to each other by 180 ° are turned, that is, when the phase relationship is every half circumference, the reel side contact 6 comes to a position corresponding to the main body side contact 8. ing.
[0019]
Further, when the claw portion 13a of the lock member 13 is not engaged with the lock groove 2c, the lock member 13 is lifted around the rotation shaft 15. Conversely, the protrusion 13c of the lock member 13 is in a lowered state, and the operating portion 16a of the lock detection switch 16 is pushed down, so that the movable contact piece 16b of the lock detection switch 16 having a spring property is bent downward. It becomes a state. At this time, since the contact 16d on the movable contact piece 16b is separated from the contact 16e on the fixed contact piece 16c side, the connection of the two lead wires 17 connected to the electric circuit of the main body 1 is disconnected. When this is notified to the electric circuit of the main body 1, it is possible to detect whether or not the reel section 2 is locked, that is, whether or not the reel-side contact 6 is in a position corresponding to the main-body-side contact 8. .
[0020]
Only when the reel side contact 6 is in a position corresponding to the main body side contact 8, the electric circuit of the main body portion 1 provides power supply and control signals to the lead wire 12, so that the reel side contact 6 does not correspond to the main body side contact 8. There will be no problems due to contact with
[0021]
In this way, the reel unit 2 is locked at a position every half rotation, and only when the reel unit 2 is locked, the device attached to the tip of the cable 3 can be used. If the diameter of the reel portion 2 is not so large, a considerable degree of freedom can be given to the length of the drawn cable 3. If a fine length setting is necessary, the length of the cable 3 can be finely set by making the phase relationship to be locked fine every 90 ° or every 60 °.
[0022]
In the present embodiment, the cable 3 cannot be wound or pulled out while the device attached to the tip of the cable 3 is operated. As described above, when a very small and high-speed signal is handled, winding and drawing of the cable while the device is operating is extremely dangerous because of chattering of the contact portion. Therefore, a cable lock during operation of the device is essential.
[0023]
Next, the arrangement of the main body side contacts 8 in the direction perpendicular to the rotation axis O will be described with reference to FIG.
Ten pin-shaped main body side contacts 8a to 8j are arranged on the same circumference of the rotary shaft O. These main body side contacts 8 are alternately arranged one by one at a position shifted by exactly 180 ° between the upper and lower sides. By arranging in this way, it is possible to provide a sufficient interval between adjacent contacts, and it is possible to distribute the load generated as the contact pressure to the corresponding reel side contact 6 on an average basis. Thereby, a stable contact resistance can be maintained.
[0024]
Further, the claw portion 13a of the lock member 13 protrudes above the main body side contact 8 disposed on the upper side in FIG.
[0025]
Next, the arrangement of the reel side contacts 6 in the direction perpendicular to the rotation axis O will be described with reference to FIG.
Ten fan-shaped reel side contacts 6a to 6j are arranged on the same circumference of the rotary shaft O. These reel-side contacts 6 are arranged at regular intervals of ten at positions that are exactly 180 ° opposite to each other. 6a1 and 6a2, 6b1 and 6b2,..., 6j1 and 6j2 facing each other by 180 ° are connected in exactly the same way. The main body side contacts 8 corresponding to the respective reel side contacts 6 are indicated by dotted lines 8a to 8j.
[0026]
In this way, the reel side contact 6 and the main body side contact 8 are in contact with every other pin. Further, the claw portion 13 a of the lock member 13 engages with the lock groove 2 c of the reel portion 2 only when the reel side contact 6 comes to a predetermined position corresponding to the main body portion side contact 8. This state is exactly the same even when the reel unit 2 is rotated 180 °.
[0027]
Now, the diameter of the contact portion required in this case is D1. This is much smaller than the necessary diameter D shown in the conventional example, and a small cable winding device can be realized. In this embodiment, all the contacts are arranged on one circumference. However, when more lines are required, the contacts are arranged on double and triple concentric circumferences having different diameters. Thereby, a rotation part contact can be comprised, without enlarging the diameter of a contact part.
[0028]
Next, the electrical circuit configuration of the cable winding device according to the embodiment of the present invention will be described with reference to FIG. This example is an example of an integrated video camera incorporating a cable winding device.
FIG. 4 is a block diagram showing the electrical circuit configuration of an integrated video camera incorporating the cable winding device of the present invention. In the figure, 1 is a fixed-side main body, 2 is a reel, 3 is a cable, 6 is a reel-side contact, 8 is a main-body-side contact, and 16 is a lock detection switch.
[0029]
Reference numeral 100 denotes a camera unit that is a device attached to the end of the cable 3, 101 denotes a zoom lens that forms an image of a light beam from a subject, 102 denotes an image sensor that photoelectrically converts the light beam formed by the zoom lens 101, and 103 denotes an image pickup A signal from the element 102 is subjected to processing such as gamma correction, color separation, and color difference matrix, and then a camera signal processing circuit for generating a standard television signal by adding a synchronization signal. 104 is a control from the electric circuit of the main unit 1 This is a camera microcomputer that performs variable control of the focal length of the zoom lens with a signal, or performs AF control and aperture control with a signal from the camera signal processing circuit 103.
[0030]
Reference numeral 105 denotes a motor driver for driving a focus motor 108 that moves a focus lens group that performs focus adjustment in the zoom lens 101, and reference numeral 106 denotes an IG driver for driving an aperture actuator 109 that moves an aperture in the zoom lens 101. , 107 is a motor driver for driving a zoom motor 110 that moves a lens group for zooming in the zoom lens 101.
[0031]
Reference numeral 111 denotes a recorder circuit that records a video signal from the camera signal processing circuit 103, 112 denotes a main body microcomputer that controls the recorder circuit 111 and communicates with and controls the camera microcomputer 104, and 113 denotes a camera microcomputer 104 and the main body microcomputer 112. Connection control circuit for controlling communication connection and power supply control, 114 is a power supply circuit for supplying power to the camera signal processing circuit 103, camera microcomputer 104, recorder circuit 111, main body microcomputer 112, etc. 115 is a zoom switch or the like Operation switch.
[0032]
In the video camera having the above configuration, a command such as a zoom operation input to the operation switch 115 is changed to a control signal by the main body microcomputer 112 and sent to the connection control circuit 113. In the connection control circuit 113, the lock detection switch 16 is turned ON only when the reel side contact 6 is in a position corresponding to the main body side contact 8, and a control signal from the main body microcomputer 112 is passed through the main body side contact 8. Finally, the zoom motor 110 performs a zoom operation.
[0033]
At this time, if the reel side contact 6 is not at a position corresponding to the main body side contact 8, the lock detection switch 16 is turned OFF and the connection control circuit 113 performs control so that the control signal is not transmitted. Does not work. As a result, it is possible to prevent accidents such as stoppage or destruction of the main body microcomputer 112 due to poor communication.
[0034]
When the reel side contact 6 is not in a position corresponding to the main unit side contact 8, the connection control circuit 113 stops supplying power to the camera signal processing circuit 103, the camera microcomputer 104, etc. Stops operating. After the reel side contact 6 returns to the position corresponding to the main body side contact 8, the operation can be reunited without any problem.
[0035]
Here, among the lines connected to the main body side contact 8, the video signal is not automatically sent when the power supply is stopped, and thus connection control is not particularly performed. In this way, it is possible to operate a device incorporating the cable winding device according to the present invention without any problem simply by performing connection control of only a specific connection line. Further, it is possible to provide a cable winding device that performs a stable connection operation even when handling a minute and high-speed signal.
[0036]
In the above-described embodiment, the description has been given by taking, as an example, a lock mechanism including a lock member, a spring, and a lock groove as a fixing means of the reel portion. As a fixing means, even if a so-called click mechanism, ratchet mechanism and lock mechanism that are fixed up to a certain load and can rotate when the load is exceeded, the connection is similarly small and stable. A cable winding device capable of performing an operation can be provided. Even in this case, the gist of the present invention does not change at all.
[0037]
Moreover, in the said embodiment, you may provide the positional relationship of the contact 6 (concentric) and the contact 8 (pin shape) in the reverse relationship by the reel side and the main-body part side.
[0038]
【The invention's effect】
As described above, according to the present invention, an appropriate and stable electrical connection of a cable including a large number of lines is achieved in this type of cable winding device, and proper operation of devices connected via the cable is performed. Guarantee. In this case, by reducing the size of the cable winding device, it has excellent usability and is extremely easy to handle. Further, since the structure of the apparatus is not substantially complicated, there is an advantage that it is extremely advantageous in terms of cost.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a cable winding device according to an embodiment of the present invention.
FIG. 2 is a view of the fixed-side main body with the reel portion removed in the embodiment of the present invention, as viewed from the reel portion side in the same direction as the reel rotation shaft.
FIG. 3 is a view of the reel unit in a state removed from the fixed-side main body according to the embodiment of the present invention, as viewed from the fixed-side main body from the same direction as the reel rotation shaft.
FIG. 4 is a block diagram showing an electrical circuit configuration of an integrated video camera incorporating a cable winding device according to an embodiment of the present invention.
FIG. 5 is a diagram showing an example of the structure of a rotatable electrical contact in a conventional cable winding device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixed-side main-body part 2 Reel part 3 Cable 4 Rotating shaft retaining member 5 Carriage retaining member 6 Reel-side contact 7 Reel-side contact holding substrate 8 Body-side contact 9 Contact stand 10 Contact spring 11 Contact substrate 12 Lead wire 13 Lock member 14 Lock spring 15 Lock member rotating shaft 16 Lock detection switch 17 Lead wire 100 Camera unit 101 Zoom lens 102 Image sensor 103 Camera signal processing circuit 104 Camera microcomputer 105 Motor driver 106 IG driver 107 Motor driver 108 Focus motor 109 Aperture actuator 110 Zoom motor 111 Recorder circuit 112 Main body microcomputer 113 Connection control circuit 114 Power supply circuit 115 Operation switch

Claims (8)

A cable winding device having a plurality of pairs of electrical contacts that can rotate relative to each other between a rotating reel unit for winding a cable and a fixed-side main body unit,
One side of each electrical contact pair is spaced apart on the same circumference around the rotation axis of the rotary reel unit, and the other side of each electrical contact pair is disposed so as to be in contact with the one side so as to have a constant rotational phase. A cable winding device characterized in that each electrical contact pair is connected at a position. The cable winding device according to claim 1, wherein one side of each electrical contact pair is provided on the rotary reel portion, and the other side is provided on the stationary-side main body portion. The cable winding device according to claim 2, further comprising positioning means capable of fixing the rotating reel portion at a fixed rotational phase position. 4. The cable winding device according to claim 2, further comprising a connection control unit that enables connection of each electrical contact pair only when the rotating reel unit is fixed at a fixed rotational phase position. 5. The cable winding device according to claim 4, wherein the connection control means can selectively connect a plurality of pairs of electrical contacts. A video camera in which the camera body and camera unit are connected via a cable,
A video camera comprising the cable winding device according to any one of claims 1 to 5 at an appropriate position of the camera body, wherein the cable is wound around the cable winding device. The video camera according to claim 6, wherein the cable includes at least a power supply line, a control signal line, and a video signal line. The connection control means according to claim 4 is provided, and any one of the power supply line, the power supply line, and the control signal line can be selectively connected by the connection control means. The video camera described in.

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