JP3413397B2 - Dimming control lighting equipment for incandescent lamps - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimming control lighting device for an incandescent lamp which is provided with a lighting device using an incandescent lamp as a light source and is used as stage lighting or TV studio lighting.

[0002]

2. Description of the Related Art In the field of stage lighting, TV studio lighting, and the like, a large number of lighting fixtures are used. However, it is an indispensable element to freely control the luminous flux of each of the lighting fixtures, and it is smooth. Even today, incandescent lamp luminaires that use incandescent lamps such as halogen lamps as the light source are widely used because of the ability to control light. The dimming of the incandescent lamp lighting device is performed by controlling the phase angle of the electric power supplied to the lighting device using a switching element such as a thyristor.

By the way, it is known that the color temperature of the luminous flux generated by an incandescent light bulb greatly changes when the voltage supplied to the incandescent lamp illuminator is controlled to perform a dimming operation. Especially T
In TV studio lighting using a V camera, the change in color temperature due to the dimming operation has a great influence on the image quality of TV images, which is a problem.
Measures have been taken such as using a color filter for the lighting equipment to correct the color temperature, or changing the irradiation range angle of the lighting equipment instead of the dimming operation to adjust the illuminance of the illuminated surface.

In general, the luminous flux of a halogen bulb is proportional to the power of 3.38 of the supply voltage, and the color temperature is experimentally determined to be 0.
It was required to be proportional to the 36th power. Therefore, the color temperature is proportional to the 0.107th power of the luminous flux. For example, if you use a halogen bulb with a rated voltage of 3,200K, the luminous flux will be 5
When dimming to 0%, the color temperature drops to 2,970K.
FIG. 1 is a graph of specific luminous flux versus color temperature in a conventional incandescent lamp luminaire. In the past, measures to avoid this decrease in color temperature were taken by means of correction measures using color filters and adjustment of lighting fixtures, as described above, but all of them are laborious and cumbersome operations, and complete measures are taken. That was not the case.

[0005]

SUMMARY OF THE INVENTION In order to solve such a conventional problem, the applicant of the present invention has set 1 for each cycle of a power supply waveform.
Dimming operation is performed by continuously changing the firing angle using a phase control dimmer that performs a single firing operation, and positive half cycle power and negative half cycle power are supplied to the bulb respectively. We have previously proposed a dimming control lighting device for incandescent lamps that supplies separate filaments (Japanese Patent Application Nos. 11-241555 and 200).
0-254096, etc.). However, in the previously proposed lighting device, when the specific luminous flux is continuously increased as shown in FIG. 2, the first filament of the light bulb reaches the rated power (100% of the rated color temperature) and then the Since the second filament starts to light up, there is a problem that a slight decrease in color temperature is recognized before the second filament reaches the rated power, and further improvement has been required in this respect.

The present invention has been made in view of the above-mentioned conventional circumstances, and an object thereof is to supply positive half cycle power and negative half cycle power to separate filaments of a light bulb. In a dimming control lighting device for an incandescent lamp, which is configured to reduce the decrease in color temperature, after the first filament reaches a certain color temperature, the color temperature is maintained so that the decrease in color temperature is almost recognized. An object of the present invention is to provide a dimming control illumination device for an incandescent lamp that enables uncontrolled light control.

[0007]

In order to achieve the above object, the present invention uses a dimming controller capable of individually controlling positive half cycle power and negative half cycle power. Half cycle and negative half cycle of electric power are supplied to different filaments of the light bulb, the specific luminous flux is increased, and the first filament reaches a certain color temperature (for example, 97% of the rated color temperature). At some point, the power supply to the second filament is started, and at this time, the decrease in color temperature due to lighting of the second filament is compensated by further increasing the power supply to the first filament, thereby providing the second filament. The gist is to prevent a decrease in color temperature due to the start of lighting. That is, an incandescent lamp dimming control lighting device according to the present invention has a dimming control device capable of individually controlling a positive half cycle and a negative half cycle of an AC power supply voltage, as described in claim 1. The dimming control device distinguishes between positive half cycle power and negative half cycle power and supplies them to different filaments of the bulb, and when the first filament reaches a certain color temperature, It is characterized in that it is formed so as to compensate the decrease in color temperature by starting the power supply to the first filament and further increasing the power supply to the first filament.

According to the means of claim 1, it is possible to solve the problem of the dimming control illumination device for incandescent lamps previously proposed by the applicant of the present application and prevent the color temperature from being lowered during dimming.

According to claim 2 of the present application, as another filament mode of the bulb according to claim 1, a bulb in which two filaments having an intermediate terminal are enclosed in the same bulb, and each filament of the bulb is used. In addition, the positive half cycle power and the negative half cycle power are distinguished and supplied.

A third aspect of the present invention is characterized in that, in the second aspect, the rated power ratios of the two filaments enclosed in the same light bulb are mutually changed.

According to a fourth aspect of the present invention, as another filament mode of the light bulb according to the first aspect, a plurality of light bulbs are mounted in the same lighting fixture, and a positive half cycle power and a negative half cycle power are provided. It is characterized by distinguishing the light bulbs that are dimmed. Here, the plurality of light bulbs are two or more light bulbs, including both even and odd number.

A fifth aspect of the present invention is characterized in that, in the fourth aspect, the rated power ratios of a plurality of light bulbs mounted in the same lighting fixture are mutually changed.

In a sixth aspect of the present application, as a mode of the dimming control device according to any one of the first to fifth aspects, a function signal for dimming control in which a waveform corresponding to one cycle of the power source is formed in synchronization with the power source waveform. An operation that includes a generator, a comparator, and a switching element that individually controls the positive half-cycle power and the negative half-cycle power, and performs the dimming operation with the function waveform of the function signal generator by the comparator. The output of the controller is compared, the output of the controller is obtained during the period when the output of the controller exceeds the voltage of the function waveform, the switching element is ignited by the output of this comparator, and the point of the phase angle control dimmer The arc angle is continuously changed, and the positive half cycle power and the negative half cycle power are supplied to different filaments respectively, and when the first filament reaches a certain color temperature, it is supplied to the second filament. Power supply of the first and Characterized by using the light control device formed to control so as to further increase the power supply to Iramento. The dimming control function signal generator is applicable regardless of whether it is an analog device or a digital device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of an embodiment of the present invention will be described below with reference to the drawings. First, the dimming control lighting device for incandescent lamps of the first example shown in FIG. 3 will be described. In the figure, reference numeral 1 is an AC power source, and 2 is a thyristor dimmer as an example of a dimming control device including an operating device. 3 is a luminaire having the incandescent lamp 8 and 9 and 10 are separate filaments of the incandescent lamp 8. The dimming control device 2 is composed of thyristor elements 4 and 5 connected in opposite directions, an ignition circuit 6 for the thyristor elements, and a manipulator 7 for dimming operation.

The operation of the dimming control device 2 is to individually control the thyristor element 4 for controlling the positive half cycle and the thyristor element 5 for controlling the negative half cycle.
The positive half-cycle power and the negative half-cycle power are distinguished and supplied to the other filaments 9 and 10 of the incandescent lamp 8, and when the first filament 9 reaches a certain color temperature, the second The power supply to the first filament 10 is started and the power supply to the first filament 9 is further increased to compensate for the decrease in color temperature. For example, as shown in FIG. 4, when the specific luminous flux is increased by the output of the operating device 7, the output voltage ratio of the positive half cycle is 65% of the power supply voltage.
Until the negative half cycle output voltage ratio is 0%. When the positive half cycle reaches 65%, the output of the negative half cycle begins to rise, but the output voltage of the positive half cycle also continuously rises until the specific luminous flux reaches 60% (output voltage ratio 70%). , The decrease in color temperature due to the lighting of the negative half cycle is compensated. When controlled in this way, the rated power ratio of the two filaments 9 and 10 is the same and their rated color temperature is 3
FIG. 4 shows the characteristic of the color temperature with respect to the specific luminous flux when a 200 K light bulb is used.

In FIG. 4, the color temperature reaches 3100K at a relative luminous flux of 37%, and the color temperature 310 reaches a specific luminous flux of 65%.
0K is retained. When the relative luminous flux is 65% or more, the color temperature gradually increases, and when the relative luminous flux is 100%, the color temperature is 320%.
Reach 0K. Therefore, the specific luminous flux 50% as shown in FIG.
There is no decrease in color temperature as described above, and it is possible to maintain 3100K or higher.

FIG. 5 shows the characteristics of the firing phase angle of the thyristor with respect to the specific light flux in this dimming control device 2. Further, FIG. 6 shows the output voltage ratio for the specific light flux in the positive direction and the negative direction in the dimming control device 2.

In FIG. 3, the power supply voltage is 100
In the case of V, the maximum voltage between the terminals 12-13 and between the terminals 11-13 is 71V, so the rated voltage of the two filaments 9 and 10 of the incandescent lamp 8 is 71V each. Now, assuming that the rated values of power and efficiency of both filaments 9 and 10 are the same, the specific luminous flux and color temperature of the filament 10 are LUX1 and COL1, respectively, and the specific luminous flux and color temperature of the filament 9 are LUX2 and COL2, respectively. The specific luminous flux of the entire incandescent light bulb 8 during dimming is (LUX1 + LUX
2) / 2, and the color temperature of the light flux of the light bulb is (LUX1 × CO
L1 + LUX2 × COL2) / (LUX1 + LUX2)
Becomes

In the above description, the rated values of the two filaments 9 and 10 in the incandescent light bulb 8 are the same, but the color temperature changes by setting the rated power of the two filaments 9 and 10 to different values. Can change their work schedule.

For example, the power ratio of the filament supplied with the positive half cycle is 0.4, the power ratio of the filament supplied with the negative half cycle is 0.6, the rated color temperature is 3100K, and the positive direction is set. Filament of 3050K
When the dimming control is performed so that the filaments in the negative direction are started to be turned on when the temperature reaches, the color temperature characteristic of FIG. 7 is obtained. In this case, at a specific luminous flux of 25% or more, 3050K or more is maintained, and the light flux gradually rises to 3200K. FIG. 8 shows the output voltage ratio of the dimming control device 2 for the specific light flux in the positive and negative directions in this dimming control.

As described above, by arbitrarily selecting the rated power and rated color temperature of both filaments, it is possible to set an arbitrary color temperature working curve.

In the above example, an incandescent light bulb having two filaments is described. However, as shown in FIG. 9, lighting using a plurality of single filament light bulbs 14 and 15 in the same luminaire. For equipment,
Naturally, the same effect can be obtained by using the dimming control device 2 that operates as described above.

FIG. 10 shows another example of the illumination device according to the present invention. In the examples of FIGS. 3 and 9 described above, three power supply wires from the dimming control device 2 to the lighting fixture 3 are required, and there is a problem that a commonly used 2P outlet or plug cannot be used. In the lighting device of FIG. 10, it is possible to provide a lighting device with little change in color temperature by using only two power supply wires. Figure 10
In FIG. 3, elements given the same reference numerals as those in FIG. 3 have the same operations and effects as those in FIG. In FIG. 10, the thyristor elements 4 and 5 are connected in antiparallel. When the output of the dimming control device 2 of this example is supplied to the luminaire 3, power is supplied to the filament 9 in the positive half cycle and to the filament 10 in the negative half cycle by the rectifiers 18 and 19 in the luminaire 3. Therefore, the same effect as in the case of FIG. 3 is obtained. The rectifiers 18 and 19 of FIG. 10 can be arbitrarily connected to the connector portion or the terminal portion of the lighting fixture 3.

A more specific structural example of the dimming control device 2 for obtaining the specific luminous flux vs. output voltage characteristics shown in FIGS. 6 and 8 is shown in FIG.
Shown in 1. Elements designated by the same reference numerals in FIG. 3 as those in FIG. 3 have the same operations and effects as those described in FIG. In FIG. 11, the operating device 7 is driven by the DC power supply 24, and the output of the operating device 7 is guided to one terminal of the comparator 22. The function waveform shown in FIG. 12 (B) is always applied to the other terminal 23 of the comparator 22, and this function waveform is synchronized with the power supply waveform in FIG. 12 (A). The comparator 22 compares this function waveform with the output of the operating unit 7, and the period when the output of the operating unit 7 exceeds the voltage of the function waveform,
An output is obtained at the comparator 22. The output of the comparator 22 is the L of the photothyristors 20 and 21 in FIG.
The thyristor is led to the ED side, and the thyristor to which the forward voltage is applied is ignited while the LED is lit. In this way, the characteristics shown in FIGS. 6 and 8 can be obtained by operating the operating device 7.

Another example of the structure of the dimming control device 2 is shown in FIG. In FIG. 13, reference numeral 25 denotes a digital dimming signal receiving terminal generally called DMX, and this dimming control device is a digital dimmer. 29 is a clock generator,
A clock signal is generated at a constant cycle. Reference numeral 28 is a counter device for counting clock signals, which is reset every cycle of the AC power supply voltage of the power supply 1. Reference numeral 27 denotes a memory device in which the characteristics of the firing phase angle of the thyristor elements 4 and 5 versus the dimming signal are written, and the output of the counter device 28 is read as an address. Reference numeral 26 is a digital comparator, which compares the digital dimming control signal supplied to the DMX receiving terminal 25 with the data read from the memory device 27, and when the dimming control signal is larger than the memory data, turns on the LED of the photothyristor. It outputs a signal that lights up. Memory device 27
The data written in 1 corresponds to the operation of the thyristor elements 4 and 5, and the data that matches the characteristics of FIGS. 6 and 8 is written. The present invention can also be implemented in a digital light control device configured as described above.

In the above description, an example in which a thyristor element is used as a power control element has been given, but the present invention is not limited to this, and another switching element such as an IGB is used.
Of course, T, power MOS transistors, etc. can also be used and are within the scope of the present invention.

Further, the dimming control device operating as described above is not limited to the above configuration example, and the positive direction and the negative direction can be controlled to the individual phase angles, and the power of the positive half cycle and the negative half cycle can be controlled. Each to another filament of the bulb, and when the first filament reaches a certain color temperature, it starts to supply power to the second filament and
Any dimming controller capable of further increasing the power supply of the filament of (1) and various proposals are possible.

[0028]

Since the dimming control lighting device for incandescent lamps according to the present invention is configured as described above, the problems of the dimming control lighting device for incandescent lamps previously proposed by the applicant of the present application are solved,
It produces many effects, such as the ability to perform dimming operations with extremely little change in color temperature in incandescent lighting equipment in stage and TV studio production lighting.

When the rated powers of the two filaments in the same light bulb are set to different values, the working range of the color temperature change can be changed. In other words, set an arbitrary color temperature working curve by further selecting the rated power and rated color temperature of both filaments, such as further improvement of the color temperature drop in the low illuminance range and reduction of the color temperature change. Can be done.

When the rated powers of a plurality of light bulbs mounted in the same lighting fixture are set to different values, the working range of the color temperature change can be changed. In other words, set an arbitrary color temperature range curve by further selecting the rated power and rated color temperature of both bulbs, such as further improvement of the color temperature drop in the low illuminance range and reduction of the color temperature change. Can be done.

[Brief description of drawings]

FIG. 1 is a graph showing a relative luminous flux vs. color temperature characteristic in a conventional lighting device.

FIG. 2 is a graph showing specific luminous flux vs. color temperature characteristics in which the color temperature characteristics are improved by the dimming control illumination device for incandescent lamps previously proposed by the applicant of the present application.

FIG. 3 is a circuit configuration diagram showing an example of an embodiment of the present invention.

FIG. 4 is a graph showing specific luminous flux versus color temperature characteristics in which the color temperature characteristics are further improved by the dimming control illumination device for an incandescent lamp of the present invention.

FIG. 5 is a graph showing specific luminous flux versus ignition phase angle characteristics of the dimming control illumination device for an incandescent lamp of the present invention.

FIG. 6 is a graph showing the ratio of specific luminous flux to output voltage by the dimming control illumination device for incandescent lamp of the present invention.

FIG. 7 is a graph showing specific luminous flux vs. color temperature when the rated power ratios of filaments in the dimming control lighting device for incandescent lamps of the present invention are different.

FIG. 8 is a graph showing specific luminous flux vs. output voltage when the rated power ratios of filaments in the incandescent lamp dimming control lighting device of the present invention are different.

FIG. 9 is a configuration diagram showing an example in which a plurality of light bulbs are mounted in the same lighting fixture.

FIG. 10 is a configuration diagram showing another embodiment example according to the present invention.

FIG. 11 is a configuration diagram showing a specific example of a dimming control device according to the present invention.

FIG. 12 is a functional waveform diagram of the dimming control device according to the present invention.

FIG. 13 is a configuration diagram showing another specific example of the dimming control device according to the present invention.

[Explanation of symbols]

1: AC power supply 2: Dimming control device 3: Lighting equipment 4, 5: Thyristor element (switching element) 6: Firing circuit 7: Light control device 8: Incandescent light bulb 9, 10: Filament 11, 12, 13: output terminals 14,15: Incandescent light bulb 16, 17: Output terminal 18, 19: Rectifier 20, 21: Photothyristor 22: Comparator 23: Function signal input terminal 24: DC power supply 25: DMX input terminal 26: Digital comparator 27: Memory device 28: Counter device 29: Clock generator

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H05B 39/08

Claims (6)

(57) [Claims] 1. A dimming control device capable of individually controlling a positive half cycle and a negative half cycle of an AC power supply voltage, the positive dimming power and a negative half cycle by the dimming control device. The power of the first filament is supplied to the other filaments of the light bulb, and when the first filament reaches a certain color temperature, the power supply to the second filament is started and the power of the first filament is supplied. A dimming control lighting device for an incandescent lamp, characterized in that it is formed so as to compensate for a decrease in color temperature. 2. A light bulb in which two filaments having an intermediate terminal are enclosed in the same light bulb, and the two filaments are the first filament and the second filament. A dimming control lighting device for an incandescent lamp as described. 3. The dimming control lighting device for an incandescent lamp according to claim 2, wherein a rated power ratio of the two filaments is changed. 4. The light bulb according to claim 1, wherein a plurality of light bulbs are mounted in the same luminaire, and a light bulb that is dimmed by positive half cycle power and negative half cycle power is distinguished. Dimming control lighting device for incandescent lamps. 5. The dimming control illumination device for an incandescent lamp according to claim 4, wherein rated power ratios of the plurality of light bulbs are changed. 6. The function control signal generator for dimming control, wherein the dimming control device forms a waveform corresponding to one cycle of the power supply in synchronization with the power supply waveform, a comparator, a positive half cycle power and a negative power. , Each of which has a switching element for individually controlling the power of a half cycle, the comparator compares the function waveform of the function signal generator with the output of the controller for dimming operation, and the output of the controller is the voltage of the function waveform. The output of the comparator is ignited, the switching element is ignited by the output of the comparator, the firing angle of the phase angle control dimmer is continuously changed, and the positive half cycle and the negative half cycle are exceeded. Half-cycle power is supplied to each filament, and when the first filament reaches a certain color temperature, the power supply to the second filament is started and the power to the first filament is supplied. Control to increase further The dimming control illumination device for an incandescent lamp according to any one of claims 1 to 5.