JPH0918747A - Monitor camera equipment - Google Patents

Abstract

PURPOSE: To make the turn operation with less noise and vibration making a high speed mode and a low speed mode compatible by selecting a set current of a pulse motor drive circuit in response to the operation mode at a high speed/low speed. CONSTITUTION: The equipment is provided with a television camera, a rotary mechanism driving the television camera in the panning direction and in the tilt direction by pulse motors 50, 60, a drive circuit 71 driving the pulse motors 50, 60 by a setting current corresponding to at least two operation mode (high speed and low speed), and a control circuit 74 selecting the set current of the drive circuit 71 in response to the operation mode. Then the control circuit 74 selects the set current of the drive circuit 71 driving the pulse motors 50, 60 of the rotary mechanism in response to the operation mode of high/low speed. Even in the case of driving in the low speed mode and in a state of strong wind blowing such as a typhoon or rush of wind caused rarely, a torque required for a motor is increased and the control circuit 74 gives a command of selecting a 2nd setting current to the drive circuit 71.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveillance camera device having a rotating mechanism for rotating a television camera in a pan direction and a tilt direction to displace the photographing direction vertically and horizontally.

[0002]

2. Description of the Related Art FIG. 14 shows, for example, Japanese Unexamined Patent Publication No. 6-26598.
It is a figure which shows the surveillance camera apparatus shown by the 1st publication. In the figure, reference numeral 1 denotes a rotary base rotatably supported on a fixed base 3 by a shaft 61 in a pan direction, and reference numeral 2 denotes a television camera rotatably supported on the rotary base 1 by a shaft 51 in a tilt direction. .

FIG. 15 is a diagram showing the structure of a rotary table.
Reference numeral 0 is a pan motor, and 62 is a speed reduction means for transmitting the driving force of the motor 60 to the shaft 61. Similarly, 50
Is a tilting motor, and 52 is the driving force of this motor for the shaft 5
1 is a deceleration means for transmitting the power to the vehicle.

Next, the operation will be described. To operate in the pan direction, the observer operates an operation switch (not shown) or the pan motor 60 is rotated according to a preset program, and the driving force is reduced.
The turntable 1 is rotated around the axis 61 via 2 and the television camera is directed toward the monitored object. The operation in the tilt direction is performed in the same manner, and the tilting motor 50 rotates, and the driving force rotates the television camera around the shaft 51 via the speed reduction means 52 and directs it toward the monitored object.

The surveillance camera device requires a high-speed rotation mechanism that rotates quickly in order to monitor a large number of preset points within a limited time and to quickly see the place where some accident has occurred. Has been done. On the other hand, there is a demand for a rotating mechanism with less noise in order to monitor at night and not to be noticed by surrounding people. Further, a pulse motor is used as a drive source of the rotating mechanism because it has an advantage of excellent positioning accuracy because it needs to perform a reliable rotating operation even under all weather conditions such as strong wind.

[0006]

The conventional surveillance camera device is constructed as described above and has the following problems.

The pulse motor generally has a characteristic that vibration (that is, noise) becomes large as shown in FIG. 16 in a low speed region. As for the torque characteristic, the torque decreases in the high speed region as shown in FIG. Therefore, they are usually used in a specific speed range while avoiding their inappropriate speed range. However, this has a problem in that it is not possible to make the low-speed mode suitable for manual operation lower noise and the high-speed mode suitable for preset operation at the same time.

Further, although the frequency is low, there is a problem that when the driving force is set assuming a strong wind condition such as a typhoon, noise and vibration are increased more than necessary in the operation under normal good conditions.

The present invention has been made in order to solve the above problems, and achieves both low-speed low-speed mode and high-speed mode rotational operation at low noise, and even under infrequent conditions such as strong wind. An object of the present invention is to obtain a surveillance camera device capable of performing a necessary rotation operation.

[0010]

According to a first aspect of the present invention, there is provided a surveillance camera apparatus comprising: a rotation mechanism for rotating a television camera in a pan direction and a tilt direction by a pulse motor; A drive circuit that drives at a set current value corresponding to one operation mode, and a control circuit that switches the set current value of the drive circuit according to the operation mode are provided.

A surveillance camera device according to a second aspect of the present invention is
A rotation mechanism that rotates a television camera in a pan direction and a tilt direction by a pulse motor, a drive circuit that drives the pulse motor with an excitation pattern corresponding to at least two high-speed and low-speed operation modes, and the excitation pattern that drives the excitation pattern. An excitation waveform generating circuit input to the circuit and a control circuit for switching the excitation pattern input to the drive circuit according to the operation mode are provided.

A surveillance camera device according to a third aspect of the invention is
A rotation mechanism for rotating the television camera in a pan direction and a tilt direction by a pulse motor, a drive circuit for driving the pulse motor with a set current value corresponding to at least two operation modes of high speed and low speed, and a drive circuit for the drive circuit. A current value detection circuit for detecting an average value of the input current and a control circuit for switching the set current value of the drive circuit according to the input current value to the drive circuit are provided.

A surveillance camera apparatus according to a fourth aspect of the invention is
A rotation mechanism that rotates a television camera in a pan direction and a tilt direction by a pulse motor, a drive circuit that drives the pulse motor with an excitation pattern corresponding to at least two high-speed and low-speed operation modes, and the excitation pattern that drives the excitation pattern. Excitation waveform generation circuit to be input to the circuit, current value detection circuit to detect the average value of the input current to the drive circuit, and excitation pattern to be input to the drive circuit according to the average value of the input current to the drive circuit It is provided with a control circuit for switching.

A surveillance camera device according to a fifth aspect of the present invention is
A rotation mechanism for rotating the television camera in a pan direction and a tilt direction by a pulse motor, a drive circuit for driving the pulse motor with a set current value corresponding to at least two operation modes of high speed and low speed, and a coil current of the motor. And a control circuit for switching the set current value of the drive circuit according to the current waveform read by the current waveform detection circuit.

The surveillance camera device according to the invention of claim 6 is
A rotation mechanism that rotates a television camera in a pan direction and a tilt direction by a pulse motor, a drive circuit that drives the pulse motor with an excitation pattern corresponding to at least two high-speed and low-speed operation modes, and the excitation pattern that drives the excitation pattern. Excitation waveform generation circuit to be input to the circuit, current waveform detection circuit to detect the waveform of the coil current of the motor, and control to switch the excitation pattern to be input to the drive circuit according to the current waveform read by the current waveform detection circuit It is equipped with a circuit.

The surveillance camera device according to the invention of claim 7 is
A rotation mechanism for rotating the television camera in a pan direction and a tilt direction by a pulse motor, a drive circuit for driving the pulse motor with a set current value corresponding to at least two operation modes of high speed and low speed, a wind sensor, A control circuit for switching the set current value of the drive circuit according to the output of the wind sensor is provided.

The surveillance camera device according to the invention of claim 8 is
A rotation mechanism that rotates a television camera in a pan direction and a tilt direction by a pulse motor, a drive circuit that drives the pulse motor with an excitation pattern corresponding to at least two high-speed and low-speed operation modes, and the excitation pattern that drives the excitation pattern. An excitation waveform generating circuit to be input to the circuit, a wind force sensor, and a control circuit for switching the excitation pattern to be input to the drive circuit according to the output of the wind force sensor are provided.

[0018]

The control circuit of the surveillance camera apparatus according to the first aspect of the present invention switches the set current value of the drive circuit for driving the pulse motor of the rotating mechanism according to the high-speed / low-speed operation mode.

The control circuit of the surveillance camera apparatus according to the second aspect of the present invention switches the excitation pattern of the drive circuit for driving the pulse motor of the rotating mechanism according to the high-speed / low-speed operation mode.

The control circuit of the surveillance camera apparatus according to the third aspect of the present invention switches the set current value of the drive circuit for driving the pulse motor of the rotating mechanism according to the average value of the input current to the drive circuit.

The control circuit of the surveillance camera device according to the invention of claim 4 switches the excitation pattern of the drive circuit for driving the pulse motor of the rotating mechanism according to the average value of the input current to the drive circuit.

The control circuit of the surveillance camera apparatus according to the fifth aspect of the present invention switches the set current value of the drive circuit for driving the pulse motor of the rotating mechanism according to the waveform of the coil current of the pulse motor.

The control circuit of the surveillance camera device according to the sixth aspect of the present invention switches the excitation pattern of the drive circuit for driving the pulse motor of the rotating mechanism according to the waveform of the coil current of the pulse motor.

The control circuit of the surveillance camera apparatus according to the invention of claim 7 switches the set current value of the drive circuit for driving the pulse motor of the rotating mechanism in accordance with the output of the wind sensor.

The control circuit of the surveillance camera apparatus according to the eighth aspect of the present invention switches the excitation pattern of the drive circuit for driving the pulse motor of the rotating mechanism according to the output of the wind sensor.

[0026]

【Example】

Embodiment 1 FIG. Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the surveillance camera device according to the first embodiment.
14 and 15 indicate the same or corresponding portions. In the figure, 3 is a fixed base fixed to the base 30, 1 is a rotary base supported by the fixed base 3 by a shaft 61 so as to be rotatable in the pan direction, and 60 is mounted inside the rotary base 1. A pulse motor for pan 62 is a decelerating means for transmitting the driving force of the motor 60 to the shaft 61, which is a belt 600 and a worm gear 601.
It is composed of Reference numeral 610 is an encoder slit attached to the worm shaft, and 620 is the slit 6
It is a photo sensor that counts 10 pulses. 65
Is an origin switch for detecting the origin of the shaft 61.

Reference numeral 2 denotes a television camera which is rotatably supported on the rotary table 1 by a shaft 51 in the tilt direction.
Reference numeral 50 is a pulse motor for tilting mounted inside the rotary table 1, and 52 is a driving force of the motor 50.
1 is a speed reducing means for transmission to the first gear, and includes a belt 500 and a worm gear 501. Reference numeral 510 is an encoder slit attached to the worm shaft, 520 is a photosensor for counting the pulses of the slit 510, 55 is an origin switch for detecting the origin of the shaft 51, and 8 is built in the fixed base 3. Reference numeral 7 is a power supply unit, and 7 is a circuit board provided inside the turntable 1.

FIG. 2 is a diagram showing the structure of the circuit board 7.
Is a drive circuit for exciting the coils of the respective phases of the pulse motors 50 and 60 in a predetermined pattern, 72 is a current value detection circuit for detecting an average current value supplied from the power supply unit 8 to the drive circuit 71, and 73 is the drive circuit An excitation waveform generation circuit for giving an excitation command to 71, and a control circuit 74 for giving an instruction to the excitation waveform generation circuit 73 and the drive circuit 71.

Next, the pan operation in the low speed mode will be described first. An operator manually operates a console (not shown)
When the control circuit 74 is operated, the control circuit 74 commands the drive circuit 71 to supply the first set current value for low speed, and the excitation waveform generation circuit 73 is pulsed in the operation pattern as shown in FIG. Instruct to drive the motor 60.

The excitation waveform generating circuit 73 is, for example, as shown in FIG.
Excitation pattern as shown in (b) (full step drive)
To send a signal to the drive circuit 71, and the drive circuit 71 supplies the current of the waveform shown in FIG. When the pulse motor 60 rotates, the shaft 61 is rotated via the belt 600 and the worm gear 601 to rotate the rotary table 1 in the pan direction with respect to the fixed table 3.
The photo sensor 620 counts the number of pulses according to the rotation amount of the encoder slit 610, and continues the rotation while comparing the number of pulses commanded by the control circuit 74 and the number of actually rotated pulses. If the detected pulse number is insufficient with respect to the instructed pulse number, a predetermined operation is performed after returning to the origin once. At the time of this rotation operation, the motor 60 exhibits the torque characteristics as shown in FIG. 6, and the torque required for acceleration in the low speed mode is satisfied when the value of A in FIG. 6 is satisfied, and as shown in FIG. The vibration at is also suppressed to a small level.

Since the tilting operation is the same, the description is omitted. Further, it goes without saying that the pan operation and the tilt operation are not separately performed, and the pan and tilt are simultaneously operated to move toward the target direction in the shortest possible time.

Next, the pan operation in the high speed mode will be described. Here, when the supervisor issues a preset position, the control circuit 74 issues a second high-speed set current value to the drive circuit 71, and the excitation waveform generator circuit 73 A command is issued to drive the pulse motor 60 in the operation pattern shown in FIG. The excitation waveform generating circuit 73 is similar to that in the low speed mode described above.
A signal is sent to the drive circuit 71 with the excitation pattern shown in (b), and the drive circuit 71 supplies a current to the coil of the pulse motor 60 as shown in FIG. 5 (b). Also in this case, similarly to the low speed mode described above, the photo sensor 620 counts the pulses of the encoder slit 610, and when the number of detected pulses is insufficient with respect to the command pulse number, the origin return operation is similarly performed.

In the high speed mode, the acceleration rate is set to be steeper than in the low speed mode, and in order to rotationally accelerate the rotary base 1 and the television camera 2 having a certain inertial mass, a larger torque is required than in the low speed mode. Although required, at this time, the pulse motor 60 exhibits the torque characteristics as shown in FIG. 6 and satisfies the large torque (value of B in FIG. 6) required for the high speed mode.

Further, even in the operation in the low speed mode, the torque required for the motor increases in a situation where a strong wind blows rarely due to a typhoon or a gust. In this case, since the average current value flowing through the drive circuit 71 increases due to the increase of the load, the current value detection circuit 72 detects this change, and when it is detected that the threshold value is exceeded, the control circuit 74 drives the drive circuit 71. To the second set current value. The tilt operation is the same, and the description is omitted.

In the first embodiment, the current setting value that is switched between the high speed mode and the low speed mode is set in two steps, the first and second steps, but it may be set by further subdividing. Further, the set current value to be switched according to the average current value detected by the current value detection circuit 72 is set to the first and second stages, but the present invention is not limited to this, and the set current value may be increased according to the detected current value. It may be changed stepwise or steplessly.

Embodiment 2 FIG. In the first embodiment, the set current value of the drive circuit 71 is switched according to the high speed / low speed mode, but in the second embodiment, the excitation pattern of the excitation waveform generating circuit 73 is switched. .

In the operation in the low speed mode, the control circuit 74 operates as shown in FIG.
An instruction is issued to drive the pulse motor 60 in an operation pattern as shown in FIG. 4A, and the excitation waveform generation circuit 73 causes the signal of the first excitation pattern (half step drive) as shown in FIG. 4A, for example. To the drive circuit 71. At this time, the pulse motor 60 has the torque characteristics as shown in FIG. 8, and the torque required for the low speed mode is satisfied if the value of A in FIG. 8 is satisfied, and the noise is suppressed to a low level as shown in FIG. Has been.

In the high speed mode of operation, the control circuit 7
4 instructs the excitation waveform generation circuit 73 to drive the pulse motor 60 in the operation pattern as shown in FIG. 3B, and the excitation waveform generation circuit 73 has, for example, as shown in FIG. 4B. The signal of the second excitation pattern (full step drive) is sent to the drive circuit 71. At this time, the pulse motor 60 has the torque characteristics as shown in FIG. 8, and if the torque required for the high speed mode is the value of B in FIG. 8, this is satisfied, and the noise level becomes low as shown in FIG. It is suppressed.

Further, even during operation in the low speed mode, the torque required for the motor increases under strong wind conditions, but the current value detection circuit 72 changes the average current value flowing through the drive circuit 71 which changes due to an increase in load. When the control circuit 74 detects that it has exceeded a certain threshold value, the control circuit 74 commands the excitation waveform generation circuit 73 to switch to the second excitation pattern.

Embodiment 3 FIG. In the first embodiment, the drive circuit 7
Although the average current value supplied to 1 is detected and the set current value value or the excitation pattern is switched, in the third embodiment, the current waveform detection circuit that detects the waveform of the coil current of the pulse motor is used to read this current value. The control circuit 74 switches the set current value of the drive circuit 71 according to the waveform.

In FIG. 10, 75 is a drive circuit 71.
A current waveform detection circuit for detecting the waveform of the current supplied to the coil of the pulse motor from the
Is a comparator. The waveform of the coil current has a characteristic that it changes depending on the magnitude of the load as shown in FIG. 11, and the waveform corresponding to the magnitude of the load is stored in advance in the waveform memory unit 76, and is detected by the current waveform detection circuit 75. When the load is determined to be equal to or greater than a predetermined value by comparing the waveform with the waveform obtained by the comparator 77, the control circuit 74 switches the drive circuit 71 to the second set current value shown in FIG. 5B.

Embodiment 4 FIG. Although the control circuit 74 switches the set current value of the drive circuit 71 according to the current waveform supplied to the coil of the pulse motor in the third embodiment,
In the fourth embodiment, the excitation pattern of the excitation waveform generating circuit 73 is switched. The current waveform detection operation is the same as that in the third embodiment, and the excitation pattern switching operation is the same as that in the second embodiment, so a detailed description of the operation is omitted.

Example 5. In the first embodiment, the setting current value of the drive circuit 71 is switched according to the average current value of the current value detection circuit 72, but in the fifth embodiment, as shown in FIG. It is provided and the set current value is switched according to the output. FIG. 13 is a block diagram of the present embodiment. In the figure, the same reference numerals as those in FIG. 2 denote the same or corresponding parts, and 9 is a wind sensor provided on the rotary base 1 of the surveillance camera device, and its output is It is input to the control circuit 74.

Next, the operation of the fifth embodiment will be described. In normal operation, the control circuit 74 is set to the first set current value shown in FIG. 5 (a), but when the output of the wind sensor 9 exceeds a predetermined value, the control circuit 74 shows in FIG. 5 (b). Switch to the second set current value.

Embodiment 6 FIG. In the fifth embodiment, the set current value is switched according to the output of the wind sensor 9, but in the sixth embodiment, the excitation pattern is switched according to the output of the wind sensor 9. In FIG.
In a normal operation, the control circuit 74 sets the excitation waveform generation circuit 73 so as to have the first excitation pattern, but when the output of the wind sensor 9 exceeds a predetermined value, the control circuit 74 sets the second excitation pattern.
Switch to the excitation pattern of.

[0046]

As described above, according to the invention of claim 1, the control circuit for switching the set current value of the drive circuit of the pulse motor of the rotating mechanism according to the high speed / low speed operation mode is provided. There is an effect that a surveillance camera device can be obtained that can achieve both rotational operation with less noise and vibration in both the high speed mode and the low speed mode.

According to the second aspect of the invention, since the control circuit for switching the excitation pattern of the pulse motor of the rotating mechanism according to the high speed / low speed operation mode is provided, noise and vibration are small in both the high speed mode and the low speed mode. There is an effect that a surveillance camera device that can achieve both the rotation operation can be obtained.

According to the third aspect of the present invention, since the control circuit for switching the set current value of the drive circuit according to the average value of the input current to the drive circuit of the pulse motor of the rotating mechanism is provided, noise or vibration is usually provided. There is an effect that a surveillance camera device that can perform a rotating operation even under adverse conditions such as strong winds is obtained.

According to the invention of claim 4, since the control circuit for switching the excitation pattern of the excitation waveform generating circuit is provided according to the average value of the input current to the drive circuit of the pulse motor of the rotating mechanism, noise or noise is usually generated. There is an effect that it is possible to obtain a surveillance camera device that has little vibration and can perform a rotating operation even under adverse conditions such as strong wind.

According to the fifth aspect of the invention, since the control circuit for switching the set current value of the drive circuit according to the waveform of the coil current of the pulse motor of the rotating mechanism is provided, usually there is little noise and vibration, and strong wind is generated. There is an effect that a surveillance camera device capable of performing a rotating operation even under adverse conditions such as the above can be obtained.

According to the sixth aspect of the invention, since the control circuit for switching the excitation pattern of the excitation waveform generation circuit according to the waveform of the coil current of the pulse motor of the rotating mechanism is provided, noise and vibration are usually small, and There is an effect that a surveillance camera device capable of rotating even under adverse conditions such as strong wind can be obtained.

According to the invention of claim 7, since the control circuit for switching the set current value of the drive circuit of the pulse motor of the rotating mechanism according to the output of the wind sensor is provided, the noise or vibration is usually small, and the strong wind is generated. There is an effect that a surveillance camera device capable of performing a rotating operation even under adverse conditions such as the above can be obtained.

According to the invention of claim 8, since the control circuit for switching the excitation pattern of the excitation waveform generating circuit of the pulse motor of the rotating mechanism is provided according to the output of the wind force sensor, usually there is less noise and vibration, and There is an effect that a surveillance camera device capable of rotating even under adverse conditions such as strong wind can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a surveillance camera device according to first and second embodiments of the present invention.

FIG. 2 is a block diagram of a drive circuit according to first and second embodiments.

FIG. 3 is a diagram showing operation patterns of Examples 1 and 2.

FIG. 4 is a diagram showing a magnetic pattern of the pulse motors of Examples 1 and 2.

FIG. 5 is a waveform diagram of first and second set current values of the drive circuits of Examples 1 and 2.

FIG. 6 is a diagram showing output torque characteristics of the pulse motor of the first embodiment.

FIG. 7 is a diagram showing vibration characteristics of the pulse motor of the first embodiment.

FIG. 8 is a diagram showing output torque characteristics of the pulse motor of the second embodiment.

FIG. 9 is a diagram showing vibration characteristics of the pulse motor of the second embodiment.

FIG. 10 is a block diagram of a drive circuit according to embodiments 3 and 4 of the present invention.

FIG. 11 is a diagram showing load current characteristics of a pulse motor.

FIG. 12 is a sectional view of a surveillance camera device according to embodiments 5 and 6 of the present invention.

FIG. 13 is a block diagram of a drive circuit according to fifth and sixth embodiments.

FIG. 14 is a diagram showing a conventional surveillance camera device.

FIG. 15 is a sectional view of a main part of a conventional example.

FIG. 16 is a diagram showing vibration characteristics of a conventional pulse motor.

FIG. 17 is a diagram showing torque characteristics of a conventional pulse motor.

[Explanation of symbols]

1 turntable, 2 TV camera, 3 fixed stand, 7 circuit board, 9 wind sensor, 50, 60 pulse motor, 5
1, 61 axis, 52, 62 deceleration means, 71 drive circuit, 72 current value detection circuit, 73 excitation waveform generation circuit,
74 control circuit, 75 current waveform detection circuit.

Claims (8)

[Claims] 1. A television camera, a rotating mechanism for rotating the television camera in a pan direction and a tilt direction by a pulse motor, and driving the pulse motor with a set current value corresponding to at least two operation modes of high speed and low speed. A monitoring camera device comprising: a drive circuit for controlling the current, and a control circuit for switching a set current value of the drive circuit according to an operation mode. 2. A television camera, a rotating mechanism for rotating the television camera in a pan direction and a tilt direction by a pulse motor, and driving the pulse motor with an excitation pattern corresponding to at least two operation modes of high speed and low speed. A surveillance camera device comprising: a drive circuit; an excitation waveform generation circuit for inputting the excitation pattern to the drive circuit; and a control circuit for switching the excitation pattern to be input to the drive circuit according to an operation mode. 3. A television camera, a rotating mechanism for rotating the television camera in a pan direction and a tilt direction by a pulse motor, and driving the pulse motor with a set current value corresponding to at least two operation modes of high speed and low speed. Drive circuit, a current value detection circuit that detects the average value of the input current to the drive circuit, and a control circuit that switches the set current value of the drive circuit according to the input current value to the drive circuit. Surveillance camera device. 4. A television camera, a rotating mechanism for rotating the television camera in a pan direction and a tilt direction by a pulse motor, and driving the pulse motor with an excitation pattern corresponding to at least two operation modes of high speed and low speed. A drive circuit, an excitation waveform generation circuit that inputs the excitation pattern to the drive circuit, a current value detection circuit that detects the average value of the input current to the drive circuit, and an average value of the input current to the drive circuit. And a control circuit for switching the excitation pattern input to the drive circuit according to the monitoring camera device. 5. A television camera, a rotating mechanism for rotating the television camera in a pan direction and a tilt direction by a pulse motor, and driving the pulse motor at a set current value corresponding to at least two operation modes of high speed and low speed. Drive circuit, a current waveform detection circuit that detects the waveform of the coil current of the motor, and a control circuit that switches the set current value of the drive circuit according to the current waveform read by the current waveform detection circuit. Camera device. 6. A television camera, a rotation mechanism for rotating the television camera in a pan direction and a tilt direction by a pulse motor, and driving the pulse motor with an excitation pattern corresponding to at least two operation modes of high speed and low speed. A drive circuit, an excitation waveform generation circuit for inputting the excitation pattern to the drive circuit, a current waveform detection circuit for detecting the waveform of the coil current of the motor, and the current waveform detection circuit according to the current waveform read by the current waveform detection circuit. A surveillance camera device comprising: a control circuit for switching an excitation pattern input to a drive circuit. 7. A television camera, a rotation mechanism for rotating the television camera in a pan direction and a tilt direction by a pulse motor, and driving the pulse motor with a set current value corresponding to at least two operation modes of high speed and low speed. A monitoring camera device comprising: a drive circuit for controlling a wind force sensor; and a control circuit that switches a set current value of the drive circuit according to an output of the wind force sensor. 8. A television camera, a rotation mechanism for rotating the television camera in a pan direction and a tilt direction by a pulse motor, and driving the pulse motor with an excitation pattern corresponding to at least two operation modes of high speed and low speed. Surveillance camera including a drive circuit, an excitation waveform generation circuit that inputs the excitation pattern to the drive circuit, a wind sensor, and a control circuit that switches the excitation pattern input to the drive circuit according to the output of the wind sensor apparatus.