JP2001143880A - Light control lighting device for incandescent electric lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light control lighting device having a low color- temperature change on controlling light of an incandescent electric lamp lighting fixture. SOLUTION: The starting time of a light control is not overlapped in each of filaments 9, 10 and a color-temperature change of the velocity of light generated in a lighting fixture is lowered on light control operation, by using a dimmer 2 carrying out one roll call every one cycle of a power source wave-form and feeding separately a positive half-cycle power and a negative half-cycle power to the filaments 9, 10. A changing extent of the color-temperature change can be varied by changing a rated power ratio. That is, a lowering of a color- temperature in a low illumination rage is re-improved, a change in a color- temperature is reduced, and by optionally selecting the rated power or rated color-temperature of the filaments 9, 10, an optional color-temperature changing curve can be established.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimming lighting device for stage lighting or TV studio lighting using a lighting fixture using an incandescent light bulb as a light source.

[0002]

2. Description of the Related Art In the field of stage lighting and TV studio lighting, it is indispensable to use a large number of lighting fixtures and to freely control the luminous flux of each lighting fixture. From now on, lighting fixtures that use incandescent bulbs such as halogen bulbs as light sources are still widely used. The dimming of the incandescent lighting equipment is performed by controlling the phase angle of the power supplied to the lighting equipment using a switching element such as a thyristor.

By the way, when a dimming operation is performed by controlling the voltage supplied to the incandescent lighting equipment, the color temperature of the luminous flux generated by the incandescent lamp greatly changes. In particular, in studio lighting using a TV camera, a change in color temperature due to a dimming operation has a significant effect on the image quality of an image, which is a problem. In order to solve this problem, a color filter has conventionally been used by using a color filter. In order to correct the illuminance, or to adjust the illuminance of the illuminated surface by changing the illumination range angle of the luminaire instead of the dimming operation, measures have been taken.

[0004]

In general, the luminous flux of a halogen bulb is determined to be proportional to the supply voltage to the power of 3.38, and the color temperature is determined from experiments to be proportional to the supply voltage to the power of 0.36.
Therefore, the color temperature is proportional to the luminous flux to the power of 0.107. For example, when a 3,200K halogen bulb at a rated voltage is used, when the luminous flux is adjusted to 50%, the color temperature becomes 2,970K.
Down to FIG. 1 is a graph of specific luminous flux versus color temperature in a conventional incandescent lighting fixture. Measures have been taken to avoid this change in color temperature by correcting the color filter and adjusting the lighting equipment, but these are both cumbersome and troublesome operations, and cannot be said to be complete measures. Was the way.

[0005] The present invention has been made in view of the above-mentioned conventional circumstances, and an object thereof is to enable light control with a small change in color temperature even when a light control operation is performed using a light control device. An object of the present invention is to provide a dimming control lighting device for an incandescent lamp.

[0006]

In order to achieve the above object, a lighting apparatus according to the present invention uses a dimmer that performs an ignition operation once every one cycle of a power supply waveform, and uses a positive half-wave dimmer. By supplying cycle and negative half-cycle power to different filaments of a light bulb, the timing of the rise of dimming in each filament is shifted, and the change in color temperature due to dimming operation is reduced. . That is, according to the present invention, dimming is performed by using a phase angle control dimmer that performs an ignition operation once for each cycle of a power supply waveform and continuously changing the firing angle. A dimming control lighting device for an incandescent lamp, which operates and supplies power of a positive half cycle and a negative half cycle to separate filaments.

According to such a means, one of the filaments rises rapidly and the other filament is rapidly controlled by continuously controlling the dimming of the positive half cycle and the negative half cycle and supplying them to separate filaments. Rises with a delay, so that a change in color temperature during the dimming operation can be greatly reduced.

The second aspect of the present invention is characterized in that, as an aspect of the separate filament in the first aspect, a light bulb in which two filaments having an intermediate terminal are enclosed in the same light bulb is used.

A third aspect of the present invention is characterized in that the rated power ratio of the two filaments enclosed in the same electric bulb is changed.

According to a fourth aspect of the present invention, as a separate filament in the first aspect, a plurality of bulbs are mounted in the same luminaire, and a bulb that is dimmed and lit in a positive half cycle and a negative half cycle is distinguished. It is characterized by the following. Here, the plurality of light bulbs are two or more light bulbs, and include both an even number and an odd number.

A fifth aspect of the present invention is characterized in that the rated power ratio of the plurality of bulbs mounted in the same lighting fixture is changed.

According to a sixth aspect of the present invention, as an aspect of the means for continuously changing the firing angle of the phase angle control dimmer according to any one of the first to fifth aspects, the phase angle control dimmer corresponds to one cycle of the power supply in synchronization with the power supply waveform. It is characterized by including a dimming control function signal generator having a waveform, a comparator, and a switching element.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. First, the lighting device of the first example shown in FIG. 2 will be described. In the drawing, reference numeral 1 denotes an AC power supply, 2 denotes a thyristor dimmer including an operation device, and 3 denotes a lighting device having an incandescent lamp 8. The two dimmers include thyristor elements 4 and 5 connected in opposite directions, an ignition circuit 6 for the thyristors, and an operation device 7 for performing dimming operation.

The operation of the dimmer 2 is different from that of the conventional thyristor dimmer in that the phase angle is controlled so that the ignition operation is performed over one cycle of the power supply waveform. 3 is shown. FIG. 3 shows output voltage waveforms between the output terminals 12 and 13 and 11 and 13 of the dimmer 2. A is a power supply voltage waveform.

As the dimmer 7 is raised from the squeezed state, the output voltage of the dimmer 2 becomes B1-B2-B3 in FIG.
-B4-B5-B6. First, when the operating device 7 is slightly raised, the state becomes B1, and an output appears between the terminals 12 and 13. However, the voltage between the terminals 11 and 13 is 0. When the operating device 7 is raised, the voltage between the terminals 11 and 13 rises until the state of B3, and thereafter, the state of half-wave conduction is maintained. On the other hand, the voltage between the terminals 11 and 13 is 0 until B3, and the output voltage increases between B4 and B6. When these output voltages are applied to the incandescent lamp 8 having the intermediate terminal of the lighting fixture 3, the filament 10 in the incandescent lamp 8 is dimmed and turned on between B1 and B3, and the other filament 9 is turned on between B4 and B6. Dimming lights. Of course, the filament 10 is lit 100% between B4 and B6.

When the power supply voltage is 100 V, the terminal 12-1
The maximum voltage between the three and the terminals 11-13 is 71V, so the rated voltage of the two filaments 9, 10 of the incandescent lamp 8 is 71V each. Now, it is assumed that the rated values such as the power and the efficiency of both the filaments 9 and 10 are the same, and the specific luminous flux and the color temperature of the filament 10 are set to LUX1 and CUX, respectively.
OL1 and the specific luminous flux and color temperature of the filament 9 are set to LUX.
2, COL2, the specific luminous flux of the entire incandescent lamp 8 during light control is (LUX1 + LUX2) / 2, and the color temperature of the bulb luminous flux is (LUX1 × COL1 + LUX2 × CO2).
L2) / (LUX1 + LUX2).

FIG. 4 shows the specific luminous flux vs. color temperature characteristic when the rated color temperature of the incandescent lamp 8 is 3,200 K. In FIG. 4, the filament 10 is turned on rapidly when the specific luminous flux is 0% to 50%, and at 50%, the color temperature reaches 3,200K. Specific luminous flux 50% -100%
During this time, the filament 9 lights up. During this time, the color temperature of the entire incandescent lamp 8 slightly decreases, but the change is 1
Stopped within 00K. Comparing the conventional color temperature change (FIG. 1) and the color temperature change according to the present invention (FIG. 4) over the entire light control range, the color temperature change of 200K or more in the range of the specific luminous flux of 10% to 50%. There are improvements.

In FIG. 4, the ratings of the two filaments 9 and 10 in the incandescent lamp 8 are the same, but by setting the rated powers of the two filaments 9 and 10 to different values, the color temperature can be reduced. You can change the work of change. For example, the specific rated power of the filament 10 is 0.4,
Assuming that the specific rated power of the filament 9 is 0.6, the color temperature is 3,200 K when the total luminous flux is 0.4 and 3.0, when the specific luminous flux is 27% or more, as shown in FIG.
A color temperature of 90K can be ensured, and a decrease in color temperature in a low illuminance range can be further improved. If the specific rated power of the filament 10 is 0.6 and the specific rated power of the filament 9 is 0.4, the color temperature becomes 3,200K when the total luminous flux is 0.6 as shown in FIG. , A color temperature of 3,120K can be secured at a specific luminous flux of 32% or more,
Changes in color temperature can be reduced. in this way,
An arbitrary color temperature working curve can be set by arbitrarily selecting the rated power and the rated color temperature of both filaments.

In the above example, a light bulb having an intermediate terminal is described as an incandescent light bulb, but as shown in FIG.
A plurality of single filament bulbs 8 'in the same luminaire,
Also in the case of the lighting fixture 3 using 8 ', the same effect can be naturally obtained by using the dimmer 2 which operates in FIG.

FIG. 6 shows another example of a lighting device according to the present invention. The lighting devices of FIGS. 2 and 5 require three power supply wires from the dimmer 2 to the lighting fixture 3, and there is a problem that a generally used 2P outlet or plug cannot be used. The lighting device of FIG. 6 can provide a lighting device with little change in color temperature using only two power supply wires. In FIG. 6, elements denoted by the same reference numerals as those in FIG. 2 have the same operation and effect. In FIG. 6, thyristor elements 4 and 5 are connected in anti-parallel. FIG. 7 shows a voltage waveform between the output terminals 14 and 15 when the operating device 7 is operated.
In FIG. 7, A is a power supply voltage waveform, and the output voltage waveform between the terminals 14 and 15 changes to B1-B2-B3-B4-B5-B6 by increasing the output of the operating device 7. When electric power having such a voltage waveform is supplied to the lighting equipment 3, the rectifiers 16 and 17 in the lighting equipment 3
Since power is supplied to the filament 9 in the positive half cycle and to the filament 10 in the negative half cycle, B1-
Between B3, the filament 10 is dimmed and turned on.
Between B6, the filament 10 is 100% and the filament 9 is dimmed and lit, and the same effect as in FIG. 2 can be obtained. The rectifiers 16 and 17 in FIG. 6 can be arbitrarily connected to the connector and the terminal of the lighting fixture 3.

When the rectifier 16 or 17 is omitted and short-circuited, both filaments 9 and 10 are dimmed and lit during the first half cycle, and the filament 9 becomes 100% in the next half cycle. Since the lighting is reached, the effect of improving the color temperature shown in FIG. 4 cannot be expected, but it is better than the conventional color temperature change shown in FIG.

FIG. 8 shows an example of the dimmer having the output voltage waveform shown in FIG. In FIG. 8, elements denoted by the same reference numerals as those in FIG. 6 have the same operations, functions and effects as those in FIG. In FIG. 8, the operating device 7 is a DC power supply 20.
, And the output of the operating device 7 is guided to one terminal of the comparator 19. The function waveform shown in FIG. 9B is always applied to the other terminal 21 of the comparator 19, and this function waveform is synchronized with the power supply waveform shown in FIG. The comparator 19 compares this function waveform with the output of the operation device 7 and
Is higher than the voltage of the function waveform, the output of the comparator 19 is obtained. Therefore, when the output of the operating device 7 is increased, the outputs of D1-D2-D3-D4 in FIG. 9 are obtained.
The output of the comparator 19 is led to the LED side of the photothyristor 18 in FIG. 8, and the thyristor is fired while the LED is on, and the thyristor elements 4 and 5 are also fired. In this way, the output of FIG. 7 can be obtained by operating the operating device 7.

In the above description, an example in which a thyristor element is used as a switching element has been described. However, the present invention is not limited to this.
Of course, a BT, a power MOS transistor or the like can be used, and it is within the scope of the present invention. Further, the dimmer operating as described above is not limited to the above example, and various proposals are possible as long as the dimmer performs one firing operation per one cycle of the power supply waveform.

As described above, the light control device according to the lighting device of the present invention is characterized in that the light control device performs an ignition operation once for each cycle of the power supply waveform. As a secondary effect, compared to the conventional dimmer that fires every half cycle, a weaker device or weaker electric line in the power supply line or load wiring line due to the thyristor firing is used. It also has the feature that it can reduce the obstacle of about half.

[0025]

According to the lighting device of the present invention, it is possible to perform a dimming operation with an extremely small change in color temperature in an incandescent lighting device in stage lighting of a stage or a TV studio.

When the rated power of the two filaments in the same bulb is set to different values, the working of the color temperature change can be changed. In other words, it is possible to set any color temperature working curve by arbitrarily selecting the rated power and the rated color temperature of both filaments, such as further improving the color temperature drop in the low illuminance range and reducing the color temperature change. Can be done.

When the rated power of a plurality of bulbs mounted in the same lighting fixture is set to different values, the working of the color temperature change can be changed. In other words, it is possible to set an arbitrary color temperature working curve by arbitrarily selecting the rated power and the rated color temperature of both bulbs, such as further improving the color temperature decrease in the low illuminance range and reducing the color temperature change. Can be done.

[Brief description of the drawings]

FIG. 1 is a graph of specific luminous flux versus color temperature in a conventional lighting device.

FIG. 2 is a configuration diagram illustrating an example of an embodiment of the present invention.

FIG. 3 is an output voltage waveform diagram in FIG. 2;

FIG. 4 is a graph of specific luminous flux vs. color temperature in the lighting device according to the present invention, in which the case where the rated power ratio of the filament is the same, and the case where the rated power ratio of the filament is changed, respectively.

FIG. 5 is a configuration diagram showing another example of the configuration of the electric bulb in FIG. 2;

FIG. 6 is a configuration diagram of another embodiment according to the present invention.

FIG. 7 is an output voltage waveform diagram in FIG. 6;

FIG. 8 is a configuration diagram showing an example of an embodiment of a dimmer according to the present invention.

9 is an output voltage waveform diagram in FIG.

[Explanation of symbols]

 1: AC power supply 2: Dimmer 3: Lighting equipment 4, 5: Thyristor element (switching element) 6: Ignition circuit 7: Dimming controller 8: Incandescent lamp 9, 10: Filament 11, 12, 13: Output Terminals 14, 15: Output terminals 16, 17: Rectifier 18: Photothyristor 19: Comparator 20: DC power supply 21: Function signal input terminal

Claims (6)

[Claims] 1. A dimming operation is performed by using a phase angle control dimmer that performs an ignition operation once for each cycle of a power supply waveform and continuously changing the ignition angle. A dimming control lighting device for an incandescent lamp, characterized in that the cycle and the negative half cycle power are respectively supplied to separate filaments of a light bulb. 2. The dimming control lighting device for an incandescent lamp according to claim 1, wherein a light bulb in which two filaments each having an intermediate terminal are enclosed in the same light bulb is used. 3. The dimming control lighting device for an incandescent lamp according to claim 2, wherein the rated power ratio of the two filaments sealed in the same bulb is changed. 4. The incandescent light control according to claim 1, wherein a plurality of light bulbs are mounted in the same lighting fixture, and the light bulbs which are dimmed and lit in a positive half cycle and a negative half cycle are distinguished. Light control lighting device. 5. The dimming control lighting device for an incandescent lamp according to claim 4, wherein the rated power ratio of a plurality of bulbs mounted in the same lighting fixture is changed. 6. A dimming control function signal generator which forms a waveform corresponding to one cycle of a power supply in synchronization with a power supply waveform as means for continuously changing a firing angle of the phase angle control dimmer;
The dimming control lighting device for an incandescent lamp according to claim 1, further comprising a comparator and a switching element.