JPH0676607A - Changeable lighting device - Google Patents

Abstract

PURPOSE:To set control positions of a changeable mechanism and detect the positions at a high precision. CONSTITUTION:A drive part control device 20 gives position data to a D/A converter 61. A comparator 62 compares analogue-converted position data with position data of a movable mechanism detected by a potentiometer 24. An output of the comparator 62 is given to a drive part control device 20 as a direction signal. The drive part control device 20 gives speed data to a shift register 63 to generate a pulse modulation signal for a drive means 22 to drive a DC motor 23. The drive part control device 20 stops a drive means 22 at a timing when the direction signal is inverted. By changing the position data to be given to the D/A converter 61, and checking inversion of the direction signal, more correct position data can be detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable lighting device such as a remote control spotlight system used for lighting production on a theater stage.

[0002]

2. Description of the Related Art A variable lighting device such as a remote control spotlight system whose irradiation direction is variable is used for lighting production on a theater stage or a hall. The variable lighting device is mounted on a ceiling or a wall, and is remotely controlled from a console or the like. Depending on the progress of the stage, etc.,
By setting the brightness and irradiation direction of each variable lighting device in advance as a scene and reproducing each scene as the stage progresses, effective lighting effects can be achieved.

FIG. 5 shows an example of a remote control spotlight. The illuminating lamp 1 is attached to the arm 2 so as to be rotatable about a vertical axis 3. The arm 2 is attached to the drive control device 4 so as to be rotatable about a horizontal shaft 5. A vertical drive motor 6 is provided in the arm 2 and performs a vertical angular displacement (TILT) in a vertical rotation direction 7 about the vertical axis 3 of the illumination lamp 1. A horizontal drive motor 8 is provided in the drive control device 4 and drives the arm 2 so as to perform angular displacement (PAN) in the horizontal rotation direction 9. further,
There may be a variable mechanism that adjusts the focal length by changing the distance between the light source and the lens in the illumination lamp 1 or moves the position of the drive control device 4 itself that instructs the illumination lamp 1.

The prior art of such a variable lighting device which is remotely operated is disclosed in, for example, JP-A-60-143502 or JP-A-3-29296. In these prior arts, since a variable mechanism is driven, digital / analog (hereinafter abbreviated as “D / A”)
Instruction data is given to the converter, and the output is used for positioning by the servo motor drive using the analog servo system.

[0005]

In the conventional positioning control by the servomotor, the control position of the variable mechanism cannot be determined unless the position to be controlled is given to the D / A converter as position data. Moreover, since the servo function works to maintain a dynamic stable state, the control position of the variable mechanism may change. That is, the control position of the variable mechanism cannot be directly known from the control unit such as the console.

In the lighting effect, etc., the variable mechanism is actually operated to try various lighting states, and a state in which a desired effect is obtained is stored and reproduced. For this reason, it is necessary to be able to accurately know the control position where the desired lighting effect can be obtained, and to accurately reproduce the control position again.

Depending on the analog servo system, it is not possible to directly know the control position. Therefore, for example, a potentiometer is connected to a variable mechanism, and its output is sent via an analog / digital (hereinafter abbreviated as "A / D") converter. It is conceivable to convert it to a digital signal and read the digital value on a console or the like. However, there is always a conversion error between the D / A converter set value and the read value by the A / D converter. Therefore, the error between the set value of the variable mechanism and the read value becomes large, and it is difficult to improve the accuracy. In order to improve accuracy, it is necessary to increase the resolution of the D / A converter and the A / D converter, which causes a cost increase.

In order to know the control position data of the variable mechanism directly as a digital value, it is possible to attach a shaft encoder or the like to the variable mechanism. However, since the shaft encoder or the like obtains the relative displacement amount from the position origin with a digital value, it is necessary to operate the variable mechanism so as to return to the position origin when the power is turned on. If it is necessary to return all the variable mechanisms to the position origin when the power is turned on, it takes a lot of time for such initialization, it takes time until control becomes possible, and the usability of the device deteriorates. There is a problem that power consumption increases.

An object of the present invention is to provide a variable lighting device capable of accurately reading and setting the control position of a variable mechanism.

[0010]

According to the present invention, in a variable lighting device having a remotely operated variable mechanism, position detecting means for deriving an analog signal representing the operating position of the variable mechanism is compared with the operating position of the variable mechanism. DA conversion means for receiving a digital signal representing a reference position to be converted and converting it into an analog signal, and responding to the analog signals from the position detection means and the DA conversion means, the relative position between the operating position of the variable mechanism and the reference position. Direction determining means for determining the direction relation and deriving a direction signal indicating the determination result, and a target position for controlling the variable mechanism in response to the direction signal from the direction determining means, until the determination result indicated by the direction signal is inverted. The digital signal that is represented is supplied to the DA conversion means to drive the variable mechanism at the first speed in the direction approaching the target position, and when the determination result represented by the direction signal is reversed, the drive of the variable mechanism is stopped. A digital signal representing the vicinity of the target position is sequentially given to the direction determining means and a position at which the direction signal is inverted is detected as a stop position, and the variable mechanism is operated from the first speed based on the difference between the stop position and the target position. And a drive control means for finely adjusting the stop position of the variable mechanism so that the stop position approaches the target position.

According to another aspect of the present invention, the drive control means outputs a digital signal representing a final position in a direction in which the variable mechanism is to be controlled, while receiving a predetermined fine adjustment signal. The variable mechanism is driven in the direction to be controlled at the second speed while being applied to the DA converting means, and after the received fine adjustment signal is stopped, the digital signal is sequentially applied to the DA converting means while the direction signal is being given. It is characterized in that the inverted position is detected as the stop position.

[0012]

According to the present invention, the drive control means drives the variable mechanism by giving the DA conversion means a digital signal representing a target position for controlling the variable mechanism. The direction determining means compares the analog signal representing the operating position with the analog signal from the DA converting means to determine the relative direction. The drive control means stops the drive at the position where the direction signal is inverted to stop the variable mechanism once. The digital signal given to the DA conversion means is changed in the vicinity of the target position, and the position where the direction signal from the direction determination means changes is determined to be the stop position. Since the drive until the variable mechanism stops is performed at a relatively large first speed, it is difficult to accurately stop the variable mechanism at the target position due to inertia. Since the variable mechanism is driven from the stop position to the target position at the second speed which is smaller than the first speed to perform fine adjustment, it is possible to accurately stop at the target position. Further, the position represented by the digital signal when the determination result represented by the direction signal from the direction determination unit is inverted can be detected as the control position of the variable unit by changing the digital signal supplied to the DA conversion unit. The position can also be read by using the DA conversion means for use. Since analog / digital conversion is not performed between position setting and detection, accurate position detection can be performed.

According to a preferred embodiment of the present invention,
The value represented by the digital signal given to the DA converting means can be changed to perform fine adjustment and position detection after stop. That is, while the predetermined fine adjustment signal is being received, a digital signal representing the final position in the direction in which the variable mechanism should be controlled is applied to the DA converter to drive the variable mechanism at the second speed. Since the variable mechanism is driven at the second speed, the stop position rarely shifts from the target position due to inertia after the driving is stopped, and the variable mechanism can be stopped at the desired position. After the variable mechanism is stopped, the digital signal given to the DA converter is changed, and the accurate stop position can be known from the determination result represented by the direction signal from the direction determining means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic electrical configuration of a variable lighting device according to an embodiment of the present invention. The variable control device 10 is
A plurality of variable mechanisms are controlled based on control data transmitted from the console 11 via the serial data transmission device 12. The variable control device 10 includes a drive unit control device 20, which is a drive control unit, a pulse generation unit 21, and a drive unit 22. One variable mechanism is driven by a DC motor 23, and its operating position is detected by a potentiometer 24 which is position detecting means. The other variable mechanism is DC
It is driven by a motor 25, and its operating position is detected by a potentiometer 26. When the drive means 22 drives a plurality of DC motors 23 and 25, the outputs from the potentiometers 24 and 26 for knowing the operating position are given to the direction determination circuit 30.

The drive unit control device 20 realized by a microcomputer or the like gives speed data for driving the DC motors 23, 25 to the pulse generating means 21, and the direction determining circuit 30 outputs the detection outputs of the potentiometers 24, 26. Gives the position data to compare with. Direction determination circuit 3
0 converts the position data given as a digital value from the drive unit control device 20 into an analog value, determines the relative direction as a detection output from the potentiometers 24 and 26, and outputs a direction signal indicating the determination result to the drive unit. It is given to the control device 20. The drive unit control device 20 detects the operating position, which is the current control position of the variable mechanism, based on the position data given to the direction determination circuit 30 and the direction signal from the direction determination circuit 30, and operates via the serial data transmission device 12. Table 11
To transmit. In addition, the drive unit controller 20 includes a drive unit 22.
The DC motors 23 and 25 can be brought into a stopped state by directly controlling.

The operation console 11 includes an input control device 41, a data control device 42, a memory device 43 and a storage / playback instruction means 44. The data control device 42 is realized by a microcomputer or the like, and the input control device 4
1 and the output from the storage / playback instruction means 44,
Depending on the result, data is read from the memory device 43 or stored in the memory device 43. In addition, the variable control device 10 can
The control data for is derived as serial data,
Also, the serial data transmitted from the variable control device 10 is received via the serial data transmission device 12.

FIG. 2 shows the structure of the surface of the operation panel 50 of the operation console 11 shown in FIG. An instrument selection push button 51, a scene instruction push button 52, a focus adjustment push button 53, a pan / tilt push button 54, a direction adjustment push button 55, and a trackball 56 are provided on the surface of the operation panel 50. The appliance selection push button 51 designates the variable control device 10 to be controlled. The scene instruction push button 52 is provided for instructing to store or reproduce data for controlling each variable mechanism in the variable control device for each scene. The focus adjustment push button 53 is provided for performing focus adjustment of the variable mechanism. The pan / tilt push button 54 enters a fine adjustment mode when the push button displayed as "fine" is operated. "P
The push buttons labeled "AN" and "TILT" specify the function of the trackball 56, respectively. The direction adjustment push button 55 adjusts the horizontal "PAN" by the push buttons 55a, 55b arranged in the horizontal direction, and the "TI" in the vertical direction by the directions 55c, 55d arranged in the vertical direction.
"LT" is controlled.

FIG. 3 shows a more detailed electrical configuration of the variable control device 10 shown in FIG. An overcurrent detection circuit 60 is provided to prevent the drive means 22 from driving the DC motor 23 with an excessive current. Direction determination circuit 3
Within 0, a D / A converter 61, which is DA conversion means to which position data is given from the drive unit controller 20, and a comparator 62, which is direction determination means, are provided. Comparator 62
Compares the analog voltage obtained by converting the position data with the analog voltage from the potentiometer 24, and supplies the drive means 22 and the drive unit controller 20 with the direction signal DIR indicating the determination result of the relative direction. A pulse width modulated (PWM) output for driving the DC motor is given to the driving means 22 from the pulse generating means 21. Pulse generator 2
1 includes a shift register 63, a timing pulse generating circuit 64 which is a signal generating means, and a clock generating circuit 65. The clock generation circuit 65 generates a basic clock signal. The timing pulse generation circuit 64 is
In response to the clock signal, a pulse signal for synchronization of the drive unit controller 20 and a shift clock signal of the shift register 63 are generated. The pulse-width-modulated output given from the pulse generating means 21 to the driving means 22 is generated by the shift register 63 based on the speed data given by the driving unit controller 20 and the shift clock given from the timing pulse generating circuit 64. Data corresponding to the output waveform is applied in parallel to the registers forming the shift register 63, and the output signal is serially derived in synchronization with the shift clock. When the overcurrent detection circuit 60 detects an overcurrent, the output of the shift register 63 is cleared and the overcurrent is stopped.

Although FIG. 3 shows only one variable mechanism, when controlling a plurality of variable mechanisms, the drive means 22, the DC motor 23, the potentiometer 24, the direction determination circuit 30, the overcurrent detection circuit 60 and the shift. As many registers 63 as the number of variable mechanisms are prepared, the drive unit controller 20, the timing pulse generating circuit 64, and the clock generating circuit 65 can be commonly used.

FIG. 4 shows the configuration related to the overcurrent detection circuit 60 shown in FIG. 3 in more detail. Overcurrent detection circuit 60
An NPN type switching transistor Q1 is included therein. The collector of the switching transistor Q1 is connected to the positive side of the DC power supply via the resistor R1. The clear input terminal (/ CLR) of the shift register 63 from the connection point between the collector of the switching transistor Q1 and the resistor R1.
The output is given to. "/" Corresponds to the overline symbol on the drawing. The emitter of the switching transistor Q1 is grounded, and the capacitor C1 is connected between the base and ground. The base of the switching transistor Q1 is connected to the connection point between the driving means 22 and the resistor R3 via the resistor R2. The resistor R3 is connected between the driving means 22 and the ground, and an output voltage corresponding to the current driving the DC motor 23 is generated. The voltage generated in the resistor R3 is
The base of the switching transistor Q1 is driven via the resistors R2 and C1 which form the integrating circuit. When the state in which the overcurrent flows continues for a certain period of time, the switching transistor Q1 becomes conductive and the shift register 6
3 is cleared, and the drive output having the pulse width modulated is not given to the drive means 22. As a result, the DC motor 23 can be protected from overcurrent.

The operation of this embodiment will be described with reference to FIGS.

First, a device selection push button 51 on the operation panel 50
Of these, the leftmost push button 51a is pushed. Next direction push button 5
The push button 55a on the right side of 5 is continuously pressed. The data control device 42 sends control data for instructing the first variable control device 10 selected by the push button 51a to rotate the horizontal direction driving DC motor instructed by the push button 55a clockwise (CW). To transmit. This instruction is made with push button 5
It is continued while pressing 5a.

Selected first variable controller 10
The drive unit control device 20 therein receives the control data, and stores the 8-bit speed data corresponding to the preprogrammed first speed in the shift register 63 in synchronization with the synchronization pulse from the timing pulse generation circuit 64. Write. The driving means 22 is instructed to stop driving.

The drive unit controller 20 determines the direction of rotation of the horizontal drive DC motor, so that the D / A converter 6 is used.
The data of "FFFH" is written in 1. The last "H"
Indicates a hexadecimal number. At this time, the accuracy of the position data is expressed by 12 bits, and the horizontal counterclockwise rotation (CE
It is assumed that the origin of W) is “0” and the end point of clockwise rotation (CW) is “FFFH”, and the potentiometer derives a voltage corresponding to this. Next, the drive unit control device 2
0 cancels the stop instruction to the drive means 22.

According to an instruction from the operator console, the illuminating lamp controlled by the first variable control device 10 starts clockwise clockwise rotation.

When it is determined that the illumination lamp controlled by the first variable control device 10 is horizontally rotated to a desired position, the pushing of the push button 55a is stopped. This cancels the horizontal rotation instruction.

When the horizontal rotation instruction is canceled, the drive section control device 20 controls the drive means 22 to a stopped state and stops writing speed data to the shift register 63. As a result, the illumination lamp controlled by the first variable control device 10 suspends horizontal rotation and stops.

The drive unit controller 20 includes a D / A converter 6
"0" is written in 1 and the direction signal from the direction determination circuit 30 is read. Next, the drive unit controller 20 sequentially increases the data to be written in the D / A converter 61, reads the direction signal, and repeats this operation until the direction is reversed.

When the direction signal from the direction determination circuit 30 is determined, the writing of data to the D / A converter 61 is stopped, and the write data at that time is regarded as the stop position data. The drive unit controller 20 returns the stop position data to the data controller 42 via the serial data transfer device 12.

Of the scene instruction push buttons 52 on the operation panel 50, the playback instruction push button 5 is pressed while the memory instruction push button 52a is being pressed.
When 2b is pressed, the returned stop position data is stored in the variable function data block in the memory device 43.

Next, the operation for reproducing the data stored in the memory device 43 will be described. In the reproduction operation, by pressing the reproduction instruction push button 52b of the operation panel 50, the stop position data stored in the variable function data block of the memory device 40 is read, and the data control device 42 passes through the serial data transmission device 12. And is transmitted to the drive unit controller 20.

The drive unit controller 20 discriminates the variable mechanism corresponding to the received stop position data, writes the data in the discriminated variable mechanism D / A converter 61, and outputs the direction signal from the direction discriminating circuit 30. Read.

The drive unit controller 20 synchronizes the 8-bit speed data corresponding to the above-mentioned first speed with the synchronizing pulse from the timing pulse generating circuit 64 and shift register 6
3 is written and the stop instruction to the driving means 22 is released.

When the drive unit controller 20 repeats writing the speed data into the shift register 63, the variable mechanism D
It moves toward the reference position represented by the data written in the / A converter 61.

The drive control device 20 includes a direction determination circuit 3
While reading the direction signal from 0, the above operation is repeated until the direction signal is inverted.

The drive control device 20 includes a direction determination circuit 3
When it is detected that the direction signal from 0 is inverted, the drive means 22 is once instructed to stop.

The drive unit controller 20 keeps the drive means 22 in the stopped state, and writes the data to be written in the D / A converter 61 with respect to the data written in by +1, +2, +3.
, Or -1, -2, -3, ..., and the inversion state of the direction signal is detected again.

The drive unit controller 20 obtains the data at the time of reversing the direction as the data of the stop position of the scene and the difference from the data set in the above as the correction amount. Drive unit controller 2
For 0, the direction value is set by writing the value of the start point or the end point, which is the limit value of the variable mechanism corresponding to the difference, to the D / A converter 61,
Preliminarily programmed velocity data corresponding to the second velocity is given to the pulse generating means 21 to perform fine adjustment. The speed of the variable mechanism driven at this time is the second speed which is smaller than the above-mentioned first speed. The trackball 5 shown in FIG.
The speed of the variable mechanism may be determined according to the rotation speed when operating 6.

As described above, according to this embodiment, the console 1
When setting the position from 1, the drive unit control device 20 gives a direction instruction and a speed instruction to the variable mechanism to rapidly perform a rough position adjustment at a relatively large first speed, and to set the stop position to the first position. Accurate positioning can be performed by finely adjusting the second speed which is smaller than the speed. In addition, by instructing the fine adjustment directly from the console 11, and by lighting the stage,
It is also possible to make an accurate adjustment while checking the operating state of the variable mechanism.

[0040]

As described above, according to the present invention, one D
By using the A conversion means, the control position of the variable mechanism can be accurately set and the stop position can be accurately known. Since there is only one conversion mechanism between analog and digital signals, conversion errors can be minimized. Also, the difference between the target position where the variable mechanism should stop and the stop position where it actually stops is detected, and fine adjustment is performed based on the difference, so the variable mechanism may wear or parts may deteriorate due to aging. Even if the error of the stop position becomes large, it is possible to finally stop at the accurate target position. Further, since it is not necessary to perform analog / digital conversion for position detection, cost increase can be suppressed even if the accuracy of digital / analog conversion is increased and more accurate control is performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic electrical configuration of an embodiment of the present invention.

FIG. 2 is a front view showing an operation panel of an operation console 11 shown in FIG.

3 is a block diagram showing a schematic electrical configuration of a variable control device 10 shown in FIG.

4 is a block diagram showing an electrical configuration related to an overcurrent detection circuit 60 shown in FIG.

FIG. 5 is a perspective view showing an appearance of a conventional variable lighting device.

[Explanation of symbols]

 10 Variable Control Device 11 Operation Console 12 Serial Data Transmission Device 20 Drive Unit Control Device 21 Pulse Generation Means 22 Drive Means 23, 25 DC Motor 24, 26 Potentiometer 30 Direction Judgment Circuit 42 Data Control Device 43 Memory Device 50 Operation Panel 51 Instrument Selection Push button 52 Scene instruction push button 55 Direction adjustment push button 60 Overcurrent detection circuit 61 D / A converter 62 Comparator 63 Shift register 64 Timing pulse generation circuit 65 Clock generation circuit

Claims (2)

[Claims] 1. A variable lighting device having a variable mechanism that is remotely operated: position detecting means for deriving an analog signal representing an operating position of the variable mechanism; and a digital signal representing a reference position to be compared with the operating position of the variable mechanism. And the DA conversion means for converting the signal into an analog signal, and the analog signal from the position detection means and the DA conversion means in response to the relative directional relationship between the operating position of the variable mechanism and the reference position. To the DA converting means, in response to the direction signal from the direction determining means, a digital signal representing the target position for controlling the variable mechanism is inverted until the determination result represented by the direction signal is inverted. The variable mechanism is driven at a first speed in the direction of approaching the target position, and when the determination result represented by the direction signal is reversed, the drive of the variable mechanism is stopped and the target position is determined by the direction determining means. The position at which the direction signal is inverted is detected as the stop position by sequentially applying digital signals representing the vicinity, and the variable mechanism is operated at the second speed smaller than the first speed based on the difference between the stop position and the target position. And a drive control unit for finely adjusting the stop position of the variable mechanism so as to approach the target position. 2. The drive control means, while receiving a predetermined fine adjustment signal, drives the variable mechanism while applying a digital signal representing a final position in a direction in which the variable mechanism should be controlled to the DA conversion means. It drives in the direction to be controlled at the second speed, and after stopping the received fine adjustment signal, the DA signal is applied to the DA conversion means while being sequentially changed, and the position at which the direction signal is inverted is detected as the stop position. The variable lighting device according to claim 1, wherein