KR20020086077A - camera for pan and tilt drive - Google Patents

Abstract

PURPOSE: A fan/tilt drive type camera is provided to accurately control position of camera by minimizing backlash during transmission of driving force of motor to a tilt shaft, while improving reliability of product. CONSTITUTION: A fan/tilt drive type camera comprises a fan motor(1); a fan case(5) for supporting an end of a fan shaft(4) which is connected to the fan motor through a timing belt; a tilt case(6) fixed integrally with the other end of the fan shaft; a tilt motor attached to the side surface of the tilt case; a tilt shaft(9) an end of which is coupled with the tilt motor and the other end of which is fixed to the tilt case such that the other end is rotatable, wherein the tilt shaft rotates a camera in a vertical direction; a bracket(10) fixed to the end of the tilt shaft through a bushing(16), and which holds the camera attached to the bracket; a protrusion(12) for restricting rotation angle of the fan shaft with respect to the fan case; and a stopper(13) formed at the outer periphery of the fan shaft, and which restricts the protrusion during rotation of the fan shaft.

Description

Pan / Tilt Drive Cameras {camera for pan and tilt drive}

The present invention precisely controls the movement position of the camera in the pan / tilt-driven camera to control the vertical movement and the left and right rotation at the same time to move the camera in the vertical and horizontal direction at the same time, the shaking of the screen transmitted to the camera The present invention relates to a pan / tilt-driven camera.

More specifically, the tilting shaft is directly driven as a motor by using a coupling integrated with the tilt shaft, thereby minimizing the amount of backlash in the power transmission area that transmits the driving force of the motor to the tilt shaft, thereby moving the camera. The present invention relates to a pan / tilt-driven camera capable of precisely controlling the camera.

In general, pan / tilt-driven cameras are used for surveillance purposes such as inside an elevator in an apartment, a department store, or around a window of a financial institution with a surveillance camera or CCTV camera fixedly supported. Since precise movement is required, the amount of backlash should be minimized when transmitting power from the drive motor.

As shown in FIGS. 1 and 2, the pan / tilt-driven camera according to the prior art disclosed in Korean Patent Laid-Open No. 2001-9351 includes a camera 20 and a camera 20 for capturing an image. A first housing 30 rotatable in a horizontal direction integrally with the camera 20 and accommodating a portion thereof, and a tilt motor 62 accommodated in the first housing 30 and rotating the camera 20 in the vertical direction; The fan motor 82 which is connected to the tilt movement device 60 having the shaft 68 and the first housing 30 and independently of the tilt movement device 60 to rotate the first housing 30 in the horizontal direction. And a fan movement device 80 having a shaft 88, a second housing 40 for accommodating the fan movement device 80, and a tilt movement device 60 and a fan movement device 80. The control apparatus 100 is provided.

At this time, the above-described tilt movement device 60 and the fan movement device 80 provides the rotation speed and the rotation force by using the motor 62, 82 and the reduction gear box 70, 90.

However, the pan / tilt-driven camera disclosed in Japanese Patent Laid-Open No. 2001-9351 uses the reduction gear box 70, in order to drive the tilt and pan motion devices 60, 80 as the above-described tilt and fan motors 62, 82. 90) By using the reduction gear formed in multiple stages inside, the backlash generated between each gear accumulates and it is impossible to precisely control the moving position of the camera 20. When the accumulated amount of backlash exceeds the reference value, tilt And a screen transmitted to the camera 20 is shaken when the fan motion devices 60 and 80 are driven.

In addition, the backlash is additionally generated due to the gear used for the connecting portion for transmitting the driving force of the tilt motor 62 to the tilt shaft 68, thereby preventing the positional accuracy of the camera 20 from falling. When the tilt motor 62 is directly connected to the tilt shaft 68, the width of the camera 20 is increased more than necessary, which causes a problem that is contrary to the trend of miniaturization required for product characteristics.

In addition, since the tilt shaft 68 is rotatably supported on both left and right sides, the tilting movement of the camera 20 when the centers of the fixed positions of both sides of the tilt shaft 68 are mismatched due to machining or assembly errors. There is also a problem that is set to tilt.

Accordingly, an object of the present invention is to directly drive the tilt shaft as the tilt shaft driving motor, thereby minimizing the amount of backlash when transferring the driving force of the motor to the tilt shaft to precisely position the camera and control the position of the screen transmitted to the camera. It is to provide a pan / tilt-driven camera that prevents shaking and improves product reliability.

It is another object of the present invention to provide a pan / tilt driven camera that can be miniaturized by preventing the camera from increasing the width of the camera by holding the tilt shaft in a single tilt housing.

1 is a side view of a pan / tilt driven camera according to the prior art;

FIG. 2 is a schematic rear view of FIG. 1;

3 is a perspective view of a pan / tilt driven camera according to the present invention;

4 is a schematic front view of FIG. 3.

* Explanation of symbols used in the main part of the drawing

One; Fan motor

2; Body

3; Timing belt

4; Fan shaft

5; Fan case

6; Tilt case

7; Tilt motor

8; camera

9; Tilt shaft

10; Bracket

11,11a, 13; Stopper

An object of the present invention described above, in the pan / tilt-driven camera, a fan motor mounted to the body, a fan case for rotatably fixing one end of the fan shaft is connected to the fan motor driven by a timing belt, Tilt case fixed integrally and supported on the other end of the fan shaft, tilt motor fixed to the side of the tilt case, one end coupled to the tilt motor and the other end rotatably fixed to the tilt case to rotate the camera up and down It is achieved by providing a pan / tilt-driven camera characterized by having a tilt shaft to move, and a bracket to which the tilt shaft is spaced apart and integrally fixed and to which the camera is fixed.

According to a preferred embodiment, a locking jaw is formed at one side of the outer periphery of the fan shaft so as to limit the rotation angle of the fan shaft with respect to the fan case described above, and a stopper for restraining and stopping the locking jaw when the fan shaft rotates is attached to the fan case. It is formed with a 180 degree phase difference.

According to a preferred embodiment, the stopper is formed in the tilt case to contact the bottom of the bracket during driving the tilt shaft described above to limit the vertical rotation angle of the camera.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to be described in detail to be easily carried out by those skilled in the art to which the present invention pertains, and thus the present invention It does not mean that the technical spirit and scope of the company is limited.

As shown in FIGS. 3 and 4, the body 2 on which the fan motor 1 is mounted, the timing belt 3 and the fan motor 1 having a smaller amount of backlash generation than the gears in the fan motor 1 are shown. A fan case 5 rotatably supported by a bearing (not shown) having one end of the fan shaft 4 connected and driven through the pulley 14 fixed to the fan shaft, and the other end of the fan shaft 4. A camera 8 provided with a tilt case 6 fixed integrally to the camera and a CCD board (PCB substrate) 15 for capturing an image on the tilt motor 7 fixed to one side of the tilt case 6. Coupling one end of the tilt shaft 9 to rotate in the vertical direction (having a rotation range of about ± 30 degrees), the other end of the tilt shaft (9) is fixed to the tilt case (6) It is rotatably fixed by a bearing (not shown) built into the tilt housing 17, and the bushing 16 is spaced apart from one end of the tilt shaft 9. The bracket 10 is fixed to the unitary and the camera 8 is fixed to the camera 8 is rotated in the vertical direction is interlocked when the tilt shaft (9) is driven.

At this time, a gear-mounted step motor is used as the tilt motor 7 described above. When the speed or torque conversion of the fan motor 1 is not necessary, the above-described fan shaft 4 uses a coupling motor or the like. It can be driven by connecting directly to (1).

In the above-described fan shaft 4 and the tilt shaft 9, the distance between the bearings is maintained by a spacer so as to prevent shaking due to the bearings which rotatably fix them, and the bearings are not used. Of course, a smooth material such as Teflon can be used.

In order to limit the rotation angle of the fan shaft 4 with respect to the fan case 5 described above, a locking jaw 12 is formed on one side of the outer periphery of the fan shaft 4, but the locking jaw 12 when the fan shaft 4 is rotated. Stopper (11, 11a) for restraining the restraining stop is formed in the fan case (5) with a phase difference of 180 degrees, when the tilt shaft (9) is driven in contact with the bottom of the bracket (10) described above, the vertical direction of the camera (8) A stopper 13 is formed in the tilt case 6 to limit the rotation angle.

Hereinafter, the operation of the pan / tilt-driven camera according to the present invention according to the accompanying drawings as follows.

3 and 4, the screen center position of the camera 8 by the CCD board 15 fixed to the bracket 10 fixed to the end of the tilt shaft 9 by the bushing 16. And the center position of the subject captured by the camera 8 to calculate the rotation direction and the movement amount to be moved by the camera 8 to drive the pan motor 1 and the tilt motor 7, And the camera 8 simultaneously moving in the vertical direction.

That is, when power is supplied from the outside to the fan motor 1 mounted on the body 2, the driving force is provided through the pulley 14 and the timing belt 3 fixed to the fan motor 1. Tilt fixed to the other end of the fan shaft 4 as the fan shaft 5 is transmitted to the fan shaft 4 rotatably fixed to the fan case 5 and rotates about the fan shaft 4 about the central axis. The camera 8 fixed to the bracket 10 fixed to the tilt housing 17 of the case 6 by the bushing 16 may be rotated in the horizontal direction.

At this time, when the aforementioned fan shaft 4 rotates, the locking jaw 12 formed at one side of the outer periphery of the fan shaft 4 is restrained with respect to the stoppers 11 and 11a formed at 180 degrees out of phase on the upper surface of the fan case 5. By constraining the rotation of the shaft 4, it is possible to limit the rotation angle of the camera 8 in the left and right directions.

When the driving force of the above-described fan motor 1 is transmitted to the fan shaft 4, the timing belt 3 having a relatively less amount of backlash generated than the gear is used, so that the camera 8 can be quickly moved to the subject and photographed. . If the speed or torque conversion of the above-described fan motor 1 is unnecessary, the above-described fan shaft 4 can be rotated by directly connecting to the fan motor 1 using a coupling or the like.

On the other hand, when the power is supplied to the above-described tilt motor (7) to drive, the tilt shaft (9), one end of which is coupled to the tilt motor (7) by coupling coupling with the axis of the tilt motor (7) as the center axis As it rotates, the camera 8 fixed to the bracket 10 fixedly supported by the bushing 16 at the other end of the tilt shaft 9 can be rotated in the vertical direction.

At this time, when the tilt shaft 9 rotates as described above, the stopper 13 fixed to the tilt case 6 restricts the amount of rotation of the bracket 10 pivoting up and down by using the tilt shaft 9 as a pivot point. By restraining, it is possible to limit the rotation angle of the camera 8 in the vertical direction.

As such, when the driving force of the tilt motor 7 described above is transmitted to the tilt shaft 9, the tilt motor 7 is directly connected to the tilt shaft 9 without using any power transmission means having a large amount of backlash such as gears. By driving the tilt shaft 9, the camera 8 can be quickly moved to the subject side.

On the other hand, one end of the above-mentioned tilt shaft (9) is coupled to the above-described tilt motor (7) by coupling, the tilt shaft (9) by the bearing built in the tilt housing (17) mounted on the tilt case (6) By only rotatably supporting only the other end of, the width of the camera 8 can be prevented from increasing, and the work time for assembling the tilt shaft 9 can be shortened to improve work efficiency.

As mentioned above, according to a preferable embodiment, it has the following advantages.

As a tilt shaft driving motor, the coupling is coupled to directly drive the tilt shaft to minimize the amount of backlash when transferring the driving force of the motor to the tilt shaft to precisely control the position of the camera and to prevent the shaking of the screen transmitted to the camera. It is possible to improve the reliability of the product.

In addition, the tilt shaft is fixed to a single tilt housing to prevent the camera from increasing more than necessary, thereby miniaturizing the product, thereby increasing the competitiveness of the product.

Claims (3)

For pan / tilt-driven cameras: A fan motor mounted to the body; A fan case rotatably supporting one end of a fan shaft driven by a timing belt connected to the fan motor; A tilt case fixed integrally to the other end of the fan shaft; A tilt motor fixed to the side of the tilt case; A tilt shaft for coupling one end to the tilt motor and the other end rotatably fixed to the tilt case to pivot the camera vertically; And Pan / tilt-driven camera, characterized in that having a bracket to which the camera is fixed and fixed integrally spaced apart at one end of the tilt shaft. The fan of claim 1, wherein a locking jaw for limiting the rotation angle of the fan shaft with respect to the fan case is formed at one side of the outer periphery of the fan shaft, and the stopper restrains and stops the locking jaw when the fan shaft rotates. Pan / tilt-driven camera, characterized in that formed in the case 180 degrees out of phase difference. The pan / tilt-drive type camera according to claim 1, wherein a stopper is formed in the tilt case to contact the bottom surface of the bracket during driving the tilt shaft to limit a vertical rotation angle of the camera.