JP2007201817A - Monitoring camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a monitoring camera capable of extending the service life of a slip ring without attaching a vibration-proof material to a slip ring shaft. <P>SOLUTION: At a stationary state that a camera part 7 is not rotated, the size of a fitting hole of a shaft 5 is made larger than the size of the slip ring shaft 4a so that a non-contact state of the fitting hole of the shaft 5 and the slip ring shaft 4a is maintained. Thus, the service life of the slip ring 4 is extended without attaching the vibration-proof material to the slip ring shaft 4a of the slip ring 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a surveillance camera in which a slip ring mediates an electrical signal between a camera unit having a rotation mechanism and a base unit.

In a surveillance camera having a rotation mechanism, a slip ring is generally used as a device that mediates an electrical signal between a camera unit and a base unit.
That is, the slip ring is fixed to the base portion of the surveillance camera, and the slip ring shaft of the slip ring is fitted into the fitting hole of the shaft to which the camera portion is fixed.
Accordingly, when the shaft rotates with the rotation of the camera unit, the slip ring shaft fitted in the fitting hole of the shaft rotates integrally with the shaft.
At this time, since the slip portion attached to the slip ring shaft rotates while sliding with the brush (the brush is electrically connected to the base portion), even if the camera portion rotates, The electrical conduction state between the base portions can be maintained (see, for example, Patent Documents 1 and 2).

In a conventional surveillance camera, when the camera unit is in a stationary state where it is not rotating, for example, when a minute vibration is received from an installation site such as a ceiling, the vibration is transmitted to the slip ring shaft of the slip ring. Is fixed to the shaft, an unreasonable force may act on the slip ring shaft.
If an excessive force acts on the slip ring shaft, the slip portion and the brush may rub, and the life of the slip ring may be shortened.
Therefore, a slip ring device has been developed in which a vibration isolator is attached to the slip ring shaft so that the vibration isolator absorbs minute vibrations (see, for example, Patent Document 3).
However, if the vibration isolating material changes over time and the vibration isolating function decreases, minute vibrations cannot be sufficiently absorbed. Further, depending on the material of the vibration isolator, minute vibrations cannot be sufficiently absorbed. Therefore, even if a vibration isolator is attached to the slip ring shaft, the life of the slip ring may be shortened.

Japanese Unexamined Patent Publication No. 2000-4384 (FIG. 1) JP-A-5-326095 (FIG. 1) JP-A-6-124757 (FIG. 1)

  The conventional surveillance camera is configured as described above, so even if a vibration isolator is attached to the slip ring shaft, if the vibration isolator changes over time and the anti-vibration function deteriorates, it absorbs minute vibrations sufficiently. There is a problem that the life of the slip ring may be shortened.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a surveillance camera capable of extending the life of the slip ring without attaching a vibration isolating material to the slip ring shaft.

  In the surveillance camera according to the present invention, the size of the fitting hole of the shaft is adjusted so that the fitting hole of the shaft and the slip ring shaft are kept in a non-contact state when the camera unit is not rotating. The size is larger than the size.

  According to the present invention, in the stationary state where the camera unit is not rotating, the size of the shaft fitting hole is set to the size of the slip ring shaft so that the shaft fitting hole and the slip ring shaft are not in contact with each other. Since it is configured to be larger, there is an effect that the life of the slip ring can be extended without attaching a vibration isolating material to the slip ring shaft.

Embodiment 1 FIG.
1 is an exploded view showing a surveillance camera according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view showing a main part of the surveillance camera according to Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view taken along the line AA in FIG.
In the figure, a camera case 1 is attached to, for example, a ceiling.
The base unit 2 is fixed to the camera case 1. For example, an electric circuit for supplying electric power supplied from the power supply unit 3 to the camera unit 7, an electric circuit for outputting a control signal (electric signal) for controlling the motor 8, An electric circuit for outputting a video signal (electric signal) output from the camera unit 7 to a monitor (not shown) or the like is incorporated.

The slip ring 4 is fixed to the base portion 2 and has a slip ring shaft 4 a that rotates as the camera portion 7 rotates.
A slip portion (not shown) is attached to the slip ring shaft 4a of the slip ring 4 (the slip portion is built in the slip ring 4), and the slip portion is inside the slip ring 4 as the slip ring shaft 4a rotates. It rotates while sliding with the brush.
The slip ring shaft 4a is formed in a D-cut shape as shown in FIG. 3 so that the slip ring shaft 4a can rotate integrally with the shaft 5.

The shaft 5 includes a shaft 5 a having a fitting hole into which the slip ring shaft 4 a of the slip ring 4 is fitted.
As shown in FIG. 3, the shape of the fitting hole of the shaft 5 a is formed in a D-cut shape, but maintains a state where it does not contact the slip ring shaft 4 a in a stationary state where the camera unit 7 is not rotating. Therefore, the size of the fitting hole of the shaft 5a is larger than the size of the slip ring shaft 4a.
Note that the space 6 is a gap formed between the shaft 5a of the shaft 5 and the slip ring shaft 4a when the camera unit 7 is not rotating.

The camera unit 7 is fixed to the shaft 5 and rotates around the shaft 5 as the motor 8 rotates.
The camera unit 7 has a camera or the like (see FIG. 5), and a lead wire (the lead wire is a slip portion in the slip ring 4 and a lead wire) wired inside the slip ring shaft 4a. It is connected to an electric circuit in the base portion 2 via a brush (see FIG. 6).

The motor 8 is attached to the camera unit 7. As shown in FIG. 4, a motor pulley 8b is attached to the rotating shaft 8a of the motor 8, and a timing belt 9 is wound around the motor pulley 8b.
The timing belt 9 is wound around the motor pulley 8 b and the pulley 10 of the motor 8. When the rotating shaft 8 a of the motor 8 rotates, the rotational force is transmitted to the pulley 10 to rotate the camera unit 7.
The pulley 10 is fixed to the base portion 2, and a bearing 11 is installed between the shaft 5 and the shaft 5 a.
The camera unit 7 is covered with a transparent or translucent resin dome cover 12.

Next, the operation will be described.
When the rotation shaft 8a of the motor 8 attached to the camera unit 7 starts to rotate, the timing belt 9 wound around the motor pulley 8b at the tip of the rotation shaft 8a rotates. 10 is transmitted.
At this time, since the pulley 10 is fixed to the base portion 2, the camera portion 7 to which the motor 8 is attached rotates around the pulley 10 around the shaft 5.

When the camera unit 7 starts to rotate, the shaft 5 starts to rotate integrally with the camera unit 7. However, as shown in FIG. 3, the slip ring shaft 4 a of the slip ring 4 is fitted into the fitting hole of the shaft 5 a of the shaft 5. Therefore, the slip ring shaft 4a of the slip ring 4 also starts to rotate integrally.
Here, inside the slip ring shaft 4a, a lead wire electrically connected to an electric circuit in the base portion 2 is wired via a slip portion and a brush in the slip ring 4, and this lead As shown in FIGS. 5 and 6, the wire is electrically connected to the camera, the motor 8, and the like in the camera unit 7.

On the other hand, in the stationary state where the motor 8 attached to the camera unit 7 is stopped, as shown in FIG. 3, the size of the fitting hole of the shaft 5a of the shaft 5 is larger than the size of the slip ring shaft 4a. A space 6 is created between the shaft 5a of the shaft 5 and the slip ring shaft 4a, and the shaft 5a of the shaft 5 and the slip ring shaft 4a are kept in a non-contact state.
For this reason, for example, even when the camera case 1 receives minute vibrations from the installation site such as the ceiling and the slip ring 4 receives minute vibrations via the base portion 2, in a stationary state where the motor 8 is stopped. Since the slip ring shaft 4a is not fixed to the shaft 5, an unreasonable force does not act on the slip ring shaft 4a.
Therefore, the slip part 4 and the brush in the slip ring 4 are not rubbed, so that a situation in which the life of the slip ring is shortened does not occur.

  As apparent from the above, according to the first embodiment, in a stationary state where the camera unit 7 is not rotating, the fitting hole of the shaft 5 and the slip ring shaft 4a are maintained in a non-contact state. Since the size of the fitting hole of the shaft 5 is made larger than the size of the slip ring shaft 4a, the life of the slip ring 4 can be extended without attaching a vibration isolating material to the slip ring shaft 4a. .

In addition, when it is necessary to replace the slip ring due to its life, in the conventional surveillance camera, since the slip ring is fixed to the camera unit via the shaft, in order to maintain the rotation accuracy of the camera unit, the camera unit It is necessary to readjust the timing belt that drives the motor, which requires a lot of work time.
However, in the first embodiment, since the slip ring shaft 4 a of the slip ring 4 is not fixed to the camera unit 7, it is not necessary to readjust the timing belt 9 that drives the camera unit 7. Therefore, only the slip ring 4 needs to be replaced, and the work can be completed in a short time.

It is an exploded view which shows the surveillance camera by Embodiment 1 of this invention. It is sectional drawing which shows the principal part of the surveillance camera by Embodiment 1 of this invention. It is AA sectional drawing of FIG. It is explanatory drawing which shows the rotation mechanism of a camera part. It is explanatory drawing which shows the electrical connection of the surveillance camera by Embodiment 1 of this invention. It is sectional drawing which shows the detail of the slip ring of the surveillance camera by Embodiment 1 of this invention.

Explanation of symbols

  1 camera case, 2 base section, 3 power supply section, 4 slip ring, 4a slip ring shaft, 5 shaft, 5a shaft axis, 6 space section, 7 camera section, 8 motor, 8a rotation shaft, 8b motor pulley, 9 timing Belt, 10 pulley, 11 bearing, 12 dome cover.

Claims (1)

  A base portion fixed to the camera case; a slip ring fixed to the base portion; a shaft having a fitting hole into which a slip ring shaft of the slip ring is fitted; and the shaft fixed to the shaft and having the shaft as an axis. In a surveillance camera comprising a rotating camera unit, in a stationary state in which the camera unit is not rotating, the shaft fitting hole and the slip ring shaft are maintained in a non-contact state. A surveillance camera, wherein the size of the fitting hole is larger than the size of the slip ring shaft.

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