JP2008078964A - Camera drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a high speed-reduction ratio in a space-saving manner in a camera drive device for driving camera operations. <P>SOLUTION: The camera drive device for driving camera operations is provided with three-staged belts (timing belts) 3, 4, and 5 and a motor 1 that rotates the three-staged belts 3, 4, and 5 by rotating the belt 3 in a first stage. The camera operations are driven by the rotation power of a rotary shaft 2 of the belt 5 in a third stage being a final stage. By this, in the camera drive device for driving camera operations, for example, it is possible to achieve a high speed-reduction ratio in a space-saving manner. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a camera drive device, and more particularly to a camera drive device that realizes a high reduction ratio in a small space by using a three-stage belt as a drive mechanism.

For example, a pan-camera system used for the purpose of taking an image for monitoring or the like includes a drive device (a pan-camera drive device) for driving the pan-camera.
For the purpose of realizing a low-cost, small-sized pan head camera using a camera module with a high magnification lens, the stopping accuracy and stationary accuracy when turning the pan head camera are large due to the backlash of the drive mechanism. If (poor), every time the camera platform camera performs a preset operation, the camera screen shifts with respect to the monitored object, and the screen shakes due to disturbance such as wind.
As an example, the timing belt drive configuration can reduce backlash, but it is necessary to increase the ratio between the driving pulley and the driven pulley in order to increase the reduction ratio. It is.

As described above, in the conventional pan / tilt head camera driving device, development of a driving mechanism capable of realizing a high reduction ratio in a small space has been required.
The present invention has been made in view of such conventional circumstances, and an object of the present invention is to provide a camera driving device capable of realizing a high reduction ratio in a small space.

In order to achieve the above object, the camera driving apparatus according to the present invention drives the operation of the camera with the following configuration.
In other words, a third-stage belt is provided, and the first-stage belt is rotated by a motor to rotate the third-stage belt. ) To drive the operation of the camera.
Therefore, by using a three-stage belt configuration, for example, it is possible to achieve a high reduction ratio in a small space.
Various belts may be used, and a timing belt can be used as an example.

  As described above, according to the present invention, a high reduction ratio can be realized, for example, in a space-saving manner, by using a three-stage belt configuration in the drive device.

Embodiments according to the present invention will be described with reference to the drawings.
In this example, the driving mechanism of the pan head camera will be described.
FIG. 1 shows a perspective appearance example as a configuration example of a drive mechanism provided in the pan / tilt head camera drive device of this example.
FIG. 2 shows an example of the appearance of the drive mechanism shown in FIG. 1 viewed from the side.
The drive mechanism of this example mainly includes a motor 1, an output shaft (rotating shaft) 2, a first stage timing belt 3, a second stage timing belt 4, and a third stage timing belt 5. is doing.
FIG. 6A shows a configuration example in which the portions of the three-stage timing belts 3 to 5 are perspective, and FIG. 6B shows the portion of the three-stage timing belts 3 to 5 as viewed from above. A configuration example is shown.

  In the drive mechanism of this example, the first stage timing belt 3 is rotated by the motor 1, so that the rotational power of the first stage timing belt 3 is transmitted to the second stage timing belt 4 and the second stage timing belt 3 is rotated. The timing belt 4 rotates, and the rotational power of the second-stage timing belt 4 is transmitted to the third-stage timing belt 5 so that the third-stage timing belt 5 rotates. The output shaft 2 can be rotated to drive operations such as panning and tilting of the camera.

Here, in this example, the structure is such that the timing belt is mounted alternately on the upper and lower sides of the rotation axis of the timing belt. Specifically, on the rotation shaft common to the first stage timing belt 3 and the second stage timing belt 4, the first stage timing belt 3 is on the upper side, and the second stage timing belt 4 Is on the lower side. In addition, on the rotation shaft common to the second stage timing belt 4 and the third stage timing belt 5, the second stage timing belt 4 is on the lower side, and the third stage timing belt 5 is the lower side. Is on the top.
In this example, the position of the tilt axis (or pan axis) can be lowered by moving the position of the drive motor (motor 1) as far as possible from the tilt side (or pan side).

  Further, in this example, in order to increase the engagement ratio of the motor shaft pulley and realize the miniaturization, the belt width of the first-stage timing belt 3 and the second-stage timing belt 4 is set to 4 mm, and the tooth pitch is set. In order to increase the transmission torque of the final stage (third stage) to the 2GT (2 mm pitch) type, the belt width of the third stage timing belt 5 is 9 mm, and the tooth pitch is the 3GT (3 mm pitch) type. .

FIG. 3 shows an external appearance example of a perspective view of a drive mechanism in which the encoder 6 is mounted.
Thus, in this example, the encoder 6 can be attached to the output shaft 2 in order to further improve the stopping accuracy and the stationary accuracy.

FIG. 4 shows an example of the internal configuration of the pan head camera drive mechanism as viewed from the side.
FIG. 5 shows an example in which the inside of the pan head camera drive mechanism shown in FIG.
In this example, one of the drive mechanisms as shown in FIGS. 1 and 2 is provided to drive the pan operation of the camera 11, and the output shaft 2 of the drive mechanism is used as the pan shaft 8. The motor 1 of the drive mechanism is used as the pan motor 9. Further, another drive mechanism as shown in FIGS. 1 and 2 is provided to drive the tilt operation of the camera 11, and the output shaft 2 of the drive mechanism is used as the tilt shaft 7. The motor 1 of the drive mechanism is used as the tilt motor 10.
In this example, the driving parts and layout to be used are common to the pan and tilt, and the assembling time is reduced by realizing commonality in assembling.

  As described above, in the pan head camera speed reduction mechanism of this example, the timing belts 3, 4, and 5 are used as a drive mechanism that is a mechanism that reduces backlash (backlashless mechanism) and that achieves a high reduction ratio and low cost. In order to secure a space-saving and high reduction ratio, a configuration in which three-stage timing belts 3, 4, and 5 are used and space-saving mounting was performed. In this example, by laying out the three timing belts 3, 4, and 5 alternately up and down, the timing belts do not interfere with each other and can be mounted in a space-saving manner.

Further, in this example, the encoder 6 is mounted on the output shaft (rotating shaft) 2 in order to achieve higher stopping accuracy and stationary accuracy and to perform feedback control when the position is displaced due to a large external load, for example.
In this example, the drive mechanism for the pan axis 8 and the tilt axis 7 is shared, thereby reducing the cost by reducing the types of components and realizing the layout of the drive mechanism for mounting in a limited housing. .

Here, the configuration of the system and apparatus according to the present invention is not necessarily limited to the configuration described above, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various systems and devices.
The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields. For example, the three-stage belt driving mechanism according to the present invention can be applied to operate devices other than the camera.
In addition, as various processes performed in the system and apparatus according to the present invention, for example, the processor executes a control program stored in a ROM (Read Only Memory) in hardware resources including a processor and a memory. A controlled configuration may be used, and for example, each functional unit for executing the processing may be configured as an independent hardware circuit.
The present invention can also be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD (Compact Disc) -ROM storing the control program, and the program (itself). The processing according to the present invention can be performed by inputting the program from the recording medium to the computer and causing the processor to execute the program.

It is a figure which shows the structural example of the drive mechanism which concerns on one Example of this invention. It is a figure which shows the structural example of the drive mechanism which concerns on one Example of this invention. It is a figure which shows the structural example of the drive mechanism which mounted the encoder which concerns on one Example of this invention. It is a figure which shows the example of an internal structure of the pan head camera drive mechanism which concerns on one Example of this invention. It is a figure which shows the example of an internal structure of the pan head camera drive mechanism which concerns on one Example of this invention. It is a figure which shows the structural example of the drive mechanism which concerns on one Example of this invention.

Explanation of symbols

  1 ・ ・ Motor, 2 ・ ・ Output shaft (rotary shaft), 3 ・ ・ Timing belt (1st stage), 4 ・ ・ Timing belt (2nd stage), 5 ・ ・ Timing belt (3rd stage), 6 ・・ Encoder, 7 ・ ・ Tilt axis, 8 ・ ・ Pan axis, 9 ・ ・ Pan motor, 10 ・ ・ Tilt motor, 11 ・ ・ Camera,

Claims (1)

In the camera drive device that drives the operation of the camera,
A three-stage belt,
A motor that rotates the belt of the third stage by rotating the belt of the first stage,
The operation of the camera is driven by the rotational power of the rotary shaft of the third stage belt, which is the final stage.
The camera drive device characterized by the above-mentioned.

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