JP2017215396A - Camera panhead device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera panhead device capable of performing a smooth rotation even when driven to rotate at a low speed.SOLUTION: The camera panhead device for driving to rotate, includes: a first rotary table which is rotatable; a second rotary table which connects the first rotary table in a direction same as the first rotary table and which is rotatable; and a pedestal base connected to the second rotary table. The camera panhead device includes means that, when making a rotation operation, causes the first rotary table and the second rotary table to rotate in a direction opposite to each other, to rotate in a desired direction by means of speed difference.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a camera pan head device, and more particularly to a camera pan head device that can be rotationally driven to a desired pan / tilt position and output an image.

  2. Description of the Related Art Conventionally, there is known a camera pan / tilt head device that outputs an image by rotationally driving pan / tilt. If the operation of the rotation drive unit is not smooth, the output video image quality is deteriorated, for example, the subject shakes up, down, left and right when projected on the display screen. Therefore, it is desirable that the motor of the rotational drive unit rotates as smoothly as possible.

  In addition, in the camera pan head device that performs pan / tilt, in order to track the subject and to eliminate the blind spot in the shooting range, the widest possible range is rotated, or the imaging device mounting unit is rotated endlessly. It is required to do.

  Patent Document 1 discloses a camera head device that stacks a plurality of rotation driving units in the pan direction with a rotation limit to widen the pan operation possible range.

  Patent Document 2 discloses a camera head device that can be driven to rotate endlessly by using a slip ring for signal transmission and reception.

JP 2000-11018 A JP 2001-183738 A

  In the prior art disclosed in Patent Document 1 and Patent Document 2 described above, there is no mention of the influence on the image by the operation of the rotation driving unit that performs panning and tilting.

  The movement of the rotation drive unit in the camera pan / tilt head device is difficult to rotate smoothly when driven at a low speed, particularly when a drive member such as a stepping motor is used. For this reason, there are cases where the subject in the video image is deteriorated in image quality such as shaking up and down and left and right.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a camera head device that can perform smooth rotation even when rotating at low speed.

In order to achieve the above object, a camera head device according to the present invention provides:
In a camera pan head device that performs rotational driving, a rotatable first turntable, a second turntable that is rotatable by connecting the first turntable in the same direction as the first turntable, and a second turntable In a pan / tilt head device comprising a pedestal connected to a turntable, when rotating, the direction of rotation of the first turntable and the direction of rotation of the second turntable are reversed, and the desired difference is determined by the speed difference. It is characterized by comprising means for rotating in the direction of.

  According to the present invention, it is possible to provide a camera head device that can perform smooth rotation even when rotating at low speed.

1 is a configuration diagram of Example 1. FIG. It is explanatory drawing of low speed mode. It is explanatory drawing of medium speed mode. It is explanatory drawing of high speed mode. FIG. 6 is a configuration diagram of Example 2. FIG. 6 is an explanatory diagram in Embodiment 2.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  In the first embodiment of the present invention, the present invention is applied to a pan driving unit.

  FIG. 1 is a block diagram for explaining a first embodiment of the present invention.

  The camera pan / tilt head device of FIG. 1 includes a fixed base 3, a first rotary base 1 in which a pan rotary shaft 4 is supported by the fixed base 3, and a pan rotary shaft 5 in the first rotary base 1. And a camera housing 7 in which a tilt rotation shaft 24 is supported by the second turntable 2.

  The fixed pedestal 3 includes a first pan motor unit 9 including a gear 8 fixed to the pan rotating shaft 4, a gear meshing with the gear 8, and a motor. The fixed base 3 further includes a drive circuit 10 for driving the first pan motor unit 9 and a control circuit 11.

  The control circuit 11 is connected to an external remote control device (not shown), a control signal input / output terminal 12 for performing control signal input / output for panning, tilting, imaging camera operation, etc., a pan rotating shaft 4 and a slip provided on the fixed base 3 The ring unit 17 and the drive circuit 10 are connected to each other. The control circuit 11 transmits / receives a control signal to / from an external remote control device (not shown), outputs a control signal to the drive circuit 10 of the first pan motor unit 9 that rotates the first turntable 1, and a second A control signal output to the drive circuit 21 of the second pan motor unit 20 that rotates the turntable 2 and a control signal output for the tilt motor unit 23 that rotates the camera housing 7 are performed. The control circuit 11 has three types of driving operation modes for each speed in the pan rotation control, and will be described in detail later with reference to FIGS. Further, the control circuit 11 transmits and receives control signals to and from the control circuit 25 in the camera housing 7 via the slip ring portions 17 and 18. The power input terminal 13 is connected to the power supply unit 14.

  The power supply unit 14 is connected to a circuit in the fixed base 3, a power supply circuit 15 for supplying power to a motor and the like, and a slip ring unit 17. The video signal output of the slip ring unit 17 is connected to the video signal output terminal 16.

  The first turntable 1 includes a gear 6 fixed to the pan rotation shaft 5, a second pan motor unit 20 including a gear and a motor meshing with the gear 6. The first turntable 1 further includes a drive circuit 21 that drives the second pan motor unit 20 and a power supply circuit 7. The slip ring portion 18 provided on the pan rotation shaft 5 and the first turntable 1 is connected to the slip ring portion 17, the drive circuit 21, and the power supply circuit 7, respectively. The power supply circuit 7 is supplied with electric power from the power supply unit 14 in the fixed base 1 through the slip ring unit 17, and supplies the electric power to a circuit, a motor and the like in the first turntable 1.

  The second turntable 2 includes a gear 19 fixed to the tilt rotation shaft 24, and a tilt motor unit 23 including a gear and a motor meshing with the gear 19. The second turntable 2 further includes a drive circuit 22 that drives the tilt motor unit 23 and a power supply circuit 28. The drive circuit 22 and the power supply circuit 28 are connected to the slip ring unit 18, respectively. The power supply circuit 28 is supplied with power from the power supply unit 14 in the fixed base 1 through the slip ring unit 17 and the slip ring unit 18, and further supplies power to a circuit, a motor, and the like in the second turntable 2.

  In the camera housing 7, an imaging camera 27, a control circuit 25, and a power supply circuit 26 are provided. The imaging camera 27 is connected to the slip ring unit 18 via the control circuit 25 and the second turntable 2. The control circuit 25 and the power supply circuit 26 are connected to the slip ring unit 18 via the second turntable 2.

  The control circuit 25 performs camera control signal input / output in accordance with a control signal from the control circuit 11 that has passed through the slip ring unit 17 and the slip ring unit 18. The imaging camera 27 outputs the captured video signal to the video signal output terminal 16 via the slip ring unit 18 and the slip ring unit 17.

  The power supply circuit 26 is supplied with electric power from the power supply unit 14 in the fixed base 3 through the slip ring unit 17 and the slip ring unit 18, and further supplies it to the circuit in the camera housing 7, the imaging camera 27 and the like.

  The rotation control of the first turntable 1 and the second turntable 2 by the control circuit 11 when the camera housing 7 is pan-rotated at a desired direction and speed will be described in detail below.

  The motor unit that rotates the turntable can obtain a stable rotation with less vibration by rotating at a certain speed or higher. For example, if the first pan motor unit 9 is not rotated at a speed equal to or higher than the speed X ° / second, the image quality deteriorates, for example, the subject in the video shakes up, down, left and right. If the second pan motor unit 20 is not rotated at a speed of Y ° / second or more, the image quality is similarly lowered.

  FIG. 2 is an explanatory diagram of a low speed mode (mode 1) in which the rotation speed is lower than the speed X ° / second and the speed Y ° / second. Here, it is assumed that the camera housing 7 is rotated in the direction 31 at a speed Z ° / second, which is lower than the speed X ° / second and the speed Y ° / second. In order to rotate at a speed of Z ° / second without causing deterioration in image quality, the control circuit 11 sets the first pan motor unit 9 to a speed of X ° / second or more and the second pan motor unit 20 to a speed Y °. / Second or more, rotating in directions opposite to each other, and rotating at a speed of Z ° / second due to the speed difference.

For example, the rotation speed of the camera housing 7 when the first pan motor unit 9 is set to a speed X (1) ° / second in the direction 29 and the second pan motor unit 20 is set to a speed Y (1) ° / second in the direction 30. The relational expression with Z is as follows. Here, X ≦ X (1), Y ≦ Y (1), and X (1) <Y (1).
Z ° / sec = (Y (1) −X (1)) ° / sec Thus, in the low-speed mode (mode 1), a plurality of motor units are driven at a stable speed or more, and a desired direction is determined by the speed difference. Prevent image quality degradation by rotating to speed.

  In the motor unit that rotates the turntable, if an electric current is passed too much or the number of drive pulses is made too fast, an overload may occur, causing the motor to step out or cause torque unevenness, resulting in a reduction in image quality. Therefore, the maximum speed at which the first pan motor unit 9 can be rotated smoothly without causing deterioration in image quality is set to a speed A ° / second, and the second pan motor unit 20 is set to a speed B ° / second. Here, A <B.

  FIG. 3 is an explanatory diagram of the medium speed mode (mode 2) in which the camera housing 7 is rotated in the direction 33 at a speed C ° / second that is faster than the low speed mode (mode 1) and slower than the speed B ° / second.

  The control circuit 11 rotates the second pan motor unit 20 in the direction 32 at a speed C ° / second, so that the camera housing 7 rotates in the direction 33 at a speed C ° / second. Here, if A> C, the first pan motor unit 9 may be rotated in the direction 32 at a speed C ° / second.

  As described above, the medium speed mode (mode 2) can save power without causing deterioration in image quality by driving only one of the plurality of motor units and rotating it in a desired direction and speed. I can plan.

  FIG. 4 shows the maximum speed A ° / second of the first pan motor section 9 and the maximum speed B ° / second of the second pan motor section 20 that can smoothly rotate the camera housing 7 without causing the above-mentioned step-out. It is explanatory drawing of the high speed mode (mode 3) rotated in the direction 36 at high speed D degrees / second. Here, A <B <D.

  The control circuit 11 only has to rotate the first pan motor unit 9 and the second pan motor unit 20 in the same direction and add the speeds to rotate at a speed D ° / second.

For example, when the first pan motor unit 9 has a speed A (1) ° / second in the direction 34 and the second pan motor unit 20 has a speed B (1) ° / second in the direction 35, the rotational speed of the camera housing 7 The relational expression with D is as follows. Here, A ≧ A (1), B ≧ B (1), and the maximum value Dmax of Dmax = A + B.
D ° / sec = (A (1) + B (1)) ° / sec In this way, in the high-speed mode (mode 3), a plurality of motor units are driven and their speeds are added to rotate in a desired direction and speed. By doing so, vibration generated by overload can be suppressed at a higher speed than when a single motor unit is driven, and deterioration of image quality can be prevented.

  As described above, in this embodiment, since the motor is always driven at a stable rotational speed with little vibration, a plurality of motor units are driven from a low speed close to 0 without causing a reduction in image quality. Smooth rotation can be performed up to the maximum value Dmax ° / second.

  FIG. 5 is a block diagram for explaining a second embodiment of the present invention.

  In the second embodiment of the present invention, the slip ring portion 17 provided on the pan rotating shaft 4 and the fixed base 3 in the first embodiment is not configured. Therefore, the rotation range is limited in the pan driving of the first turntable 1.

  The description of the same configuration and operation as those in FIGS. 1, 2, 3, and 4 is omitted.

  Similar to the first embodiment, the control circuit 11 controls the first turntable 1 and the second turntable in the low speed mode (mode 1), the medium speed mode (mode 2), and the high speed mode (mode 3) depending on the driving speed. 2 is controlled to rotate.

  Here, in the low speed mode (mode 1) and the high speed mode (mode 3), when the rotation limit of the first turntable 1 is exceeded, the mode shifts to the medium speed mode (mode 2).

  When the first turntable 1 is not near the midpoint of the rotatable range, the operation shown in FIG. 6 is performed after the pan drive of the first turntable 1 and the second turntable 2 is stopped. The control circuit 11 rotates the first turntable 1 in the direction 38 and the second turntable 2 in the direction 39 at the same speed E ° / second that does not cause deterioration in image quality. Is moved to a position near the midpoint. In this way, the camera housing 7 can be arranged at the same position on the left and right from the rotation limit position without pan driving, and can be set to the initial position in the next pan driving.

  In the first and second embodiments, the present invention is applied to pan driving, but the present invention can also be applied to a tilt operation.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

1 first turntable 2 second turntable 3 fixed base 7 camera housing
9 First pan motor unit, 11 control circuit, 20 second pan motor unit

Claims (3)

  In a camera pan head device that performs rotational driving, a rotatable first turntable, a second turntable that is rotatable by connecting the first turntable in the same direction as the first turntable, and a second turntable In a pan / tilt head device comprising a pedestal connected to a turntable, when rotating, the direction of rotation of the first turntable and the direction of rotation of the second turntable are reversed, and a predetermined difference is determined according to the speed difference. A camera pan head device comprising means for rotating in the direction of.   A camera housing that is equipped with an imaging camera and can be rotated in the vertical direction, a first turntable that can be connected to the camera housing and rotated in the horizontal direction, and a second that can be connected to the first turntable and rotated in the horizontal direction And a fixed pedestal coupled to the second turntable, the camera pan head device, and when rotating in the horizontal direction, the rotation direction of the first turntable and the second turntable Reversing the rotation direction of the turntable and rotating in a predetermined direction according to the speed difference; a second rotation mode in which only the first turntable or the second turntable is rotated; and There is a third rotation mode in which the rotation direction of the first turntable and the rotation direction of the second turntable are the same, and the first rotation mode and the second rotation speed depend on a predetermined speed range. Rotation mode, the third rotation mode Of the camera pan head device according to claim 1, characterized in that to operate in either mode.   The first rotary table and the second rotary table are provided with slip rings having the same rotational axis, and the slip ring receives a video control signal from the imaging camera, and a drive control signal for the pan head device. 3. The camera cloud according to claim 2, wherein control signals of the imaging camera can be transmitted and received, and power is supplied to the camera housing, the first turntable, and the second turntable. Stand device.