JP3140762B2 - Variable color discharge lamp lighting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a variable color discharge lamp device that performs toning and dimming by adjusting the light amounts and mixing ratios of a plurality of emission colors.

[Prior art]

Conventionally, by using a plurality of discharge lamps having different emission colors or using a discharge lamp in which a plurality of discharge paths having different emission colors are formed in one tube, a plurality of emission colors are obtained. There has been provided a variable color discharge lamp lighting device which performs toning and dimming by adjusting the amount of light and the mixing ratio of each luminescent color (Japanese Patent Application Laid-Open No. Sho 61-1986).
No. 148799). As shown in FIG. 7, for example, as shown in FIG. 7, an airtight space in which three U-shaped inner tubes 12 _R , 12 _G and 12 _B are housed in an outer tube 11 and a discharge gas is sealed therein is used as the discharge lamp 1. Some have formed. Inner tube
One end of each of 12 _R , 12 _G , and 12 _B is opened in the outer tube 11, and electrodes 13 _R , 13 _G , and 13 _B are disposed in the closed other end, respectively. Further, phosphors of different emission colors are applied to the inner peripheral surfaces of the inner tubes 12 _R , 12 _G , and 12 _B , respectively. Here, it is general to use three colors of red (R), green (G) and blue (B), which are the primary colors of the additive color mixture, as the coloring colors. Further, in the outer tube 11, between the common electrode 14 to cause main discharge between the electrodes _{13 R, 13 G, 13 B} , and the common electrode 14 is disposed in the vicinity of the common electrode 14 And an auxiliary electrode 15 for generating a micro discharge serving as a main discharge seed. Therefore,
When the state is changed from a state in which a slight discharge is generated between the common electrode 14 and the auxiliary electrode 15 to a state in which a main discharge is generated between the common electrode 14 and any one of the electrodes 13 _R , 13 _G , and 13 _B , Its electrodes 13
_R, 13 _G, 13 inner tube 12 _R corresponding to _B, 12 _G, 12 fluorescent material coated on _B is to emit light. The reason why the slight discharge is generated before the main discharge is to facilitate the transition to the main discharge. If the discharge lamp 1 having such a configuration is used, each of the electrodes 13 _R , 13 _R
By controlling the time during which the main discharge occurs between _G , _13B and the common electrode 14, the amount of light of each luminescent color can be adjusted and light can be adjusted, and the mixing ratio of each luminescent color can be adjusted. It can be toned. The discharge lamp lighting device for lighting the discharge lamp 1 basically has a configuration as shown in FIG. That is, the electrodes 13 _R , 13 _G , and 13 _B are connected to the power supply E via switching elements S _R , S _G , and S _B composed of transistors, and the common electrode 14 is connected via the current limiting element r. Moreover, to connect the auxiliary electrode 15 through the switching element S _C consisting transistor. Thus, the lighting circuit 3 is configured. Each switching element S _R , S _G , S _B , S _C is connected to a power supply E ₁
The ON / OFF timing is controlled by the control circuit 2 including As the control circuit 2, for example, a configuration as shown in FIG. 9 is considered. The output terminals O _R, O _G, O _B are respectively connected to the switching element S _R, S _G, the control terminal of the S _B (base), controls the flashing of each emission color. Output O _C is connected to the control terminal of the switching element S _C (base), controls the weak discharge as the previous species starting the main discharge. The control circuit 2 is activated by opening the switch SW from the closed state. When the switch SW is shifted from the closed state to the open state, the output level of the AND circuit 21 changes from “L” to “L”. Stand up on H ". AND circuit 21
When the output rises, the monostable multivibrator 22 is triggered. Trigger terminal A of the non-inverting output terminal Q monostable multivibrator 23 _R of the monostable multivibrator 22
Is connected to the inverted output terminal of the monostable multivibrator 22 is connected to the trigger terminal A of the monostable multivibrator 23 _C. Further, the inverted output terminal of the monostable multivibrator 23 _R is connected to the trigger terminal A of the monostable multivibrator 23 _G, the inverted output terminal of the monostable multivibrator 23 _G is connected to the trigger terminal A of the monostable multivibrator 23 _B Is done. Each monostable multivibrator 2
2,23 _R , 23 _G , 23 _B , 23 _C (for example, externally connected components to an integrated circuit known as 4528)
The time constant is set by Ra to Re and the capacitors Ca to Ce, and when the input to the trigger terminal A rises, the output of the non-inverting output terminal Q becomes "H" for a certain time corresponding to the set time constant. . Therefore, when the output level of the AND circuit 21 rises as shown in FIG. 10 (a) when the switch SW is opened, the non-inverting output terminal of the monostable multivibrator 22 as shown in FIG. 10 (b). Q output level of becomes "H" only a certain period of time t _0. When the output level of the non-inverting output terminal Q of the monostable multivibrator 22 rises,
Takes triggered monostable multivibrator 23 _R, as shown in FIG. 10 (c), the output level of the output terminal O _R is only "L" fixed time t ₁ corresponding to the time constant. When the output level of the output terminal O _R becomes to "L", the is the main discharge corresponding to red luminescent color is red light output is obtained occurs. Output terminal O _R
When the output of the rises takes triggered monostable multivibrator 23 _G, as in the FIG. 10 (d), the output level of the output terminal O _G a certain period of time t ₂ becomes "L". During this period, a main discharge corresponding to the green emission color occurs. Similarly, when the output level of the output terminal O _G rises, as in the FIG. 10 (e), the predetermined time t ₃ by the output terminal O _B that corresponds to the time constant set in the monostable multivibrator 23 _B Output level is “L”
And a main discharge corresponding to the blue emission color is generated. Here, a monostable multivibrator corresponding to red and green 23 _R ,
Although the time constant of 23 _G is adjustable, the time from the fall of the output of the output terminal Q _R to the rise of the output of the output terminal _{O B (t 1 + t 2} + t 3) , when the monostable multivibrator 22 It is set equal to a time t ₀ corresponding to a constant. As shown in FIG. 10 (f), the monostable multivibrator 23
_C, since is triggered by the rise of the output of the inverting output terminal of the monostable multivibrator 22, as FIG. 10 (g), the output of the output terminal O _C after the output has risen output terminal O _B is constant time t ₄ only becomes "L", so that the fine discharge occurs. Since the inverted output terminal of the monostable multivibrator 23 _C is connected to one input terminal of the AND circuit 21, a trigger is a monostable multivibrator 22 by the rising of the output of the output terminal O _C, repeating the above operation After that, red, green, and blue light sequentially emit light, and after each color sequentially emits light, a slight discharge is performed, and the light is not emitted until the next main discharge. If this repetition cycle is set to, for example, 10 msec or less, it appears to the human eye that each color emits light simultaneously,
It will be recognized as a mixed color. Therefore, by adjusting the time constants of the monostable multivibrators 23 _R and 23 _G , the mixing ratio of each emission color can be adjusted, and the color can be changed. Further, without changing the mixing ratio, by adjusting the time constant of the monostable multivibrator 23 _C, will be to adjust the duration of the non-emission state, it is possible to adjust the amount of light without changing the emission ratio of each color It is. FIG. 11, there is shown another configuration example of the control circuit 2, the output terminal _{O R, O G, O B} , O C , as well as the circuit configuration of FIG. 9, respectively switching element S _R , S _G , S _B , S _C. In this configuration, the monostable multivibrator 22 is triggered by the output of the oscillation circuit 24 that outputs a rectangular wave at a constant period. The non-inverting output terminal Q of the monostable multivibrator 22 is connected to the trigger terminal A of the monostable multivibrator 23 _R, the monostable multivibrator 23 inverted output terminal by the fall of the output of the monostable multivibrator 22 _G, 23 _B Reset. Monostable multivibrator 2
3 when _R is triggered by the output of the monostable multivibrator 22, the output level of the non-inverting output terminal Q to "H" only a certain time, triggers the monostable multivibrator 23 _G is after a predetermined time elapses. Similarly, when the time corresponding to the time constant set in the monostable multivibrator 23 _G has elapsed, the monostable multivibrator 23 _B is triggered. Monostable multivibrator 23 _R is triggered, the time until the falling output of the monostable multivibrator 23 _B is is set equal to the period of the output of the oscillation circuit 24, the time constant of the monostable multivibrator 22 is oscillated It is set sufficiently smaller than the output cycle of the circuit. The outputs of the non-inverting output terminals of the monostable multivibrators 23 _R , 23 _G , and 23 _B together with the output of the pulse generation circuit 25 having a fixed off-period and a variable on-period are respectively NAND circuits 26
_R, 26 _G, is input to the 26 _B, is the output of the NAND circuit 26 _R, 26 _G, 26 _B is the output of the switching elements S _R, S _G, to S _B. The output of the pulse generating circuit 25 becomes the output to the switching element S _C that controls the weak discharge. In this configuration, since the repetition period is set by the period of the output of the oscillation circuit 24, the repetition period is fixed, each by adjusting the time constant of the monostable multivibrator 23 _R, 23 _G, 23 _B Toning can be performed by adjusting the mixing ratio of the emission colors, and by adjusting the duty ratio of the output of the pulse generation circuit 25, the dimming can be performed by adjusting the amount of light. For example, FIG. 12 and FIG.
As shown in (b) to (d) of FIG. 13, even when the output level of each of the monostable multivibrators 23 _R , 23 _G , and 23 _B is set to “H” in the same manner, FIG. If the duty ratio of the output of the pulse generation circuit 26 is changed as shown in FIG. 13 (a), the output terminals O _R , _R can be changed as shown in FIGS. 12 and 13 (e) to (g). O _G, (the main discharge to each discharge path during this period occurs) to become time O _B is "L" is changed, it is possible to adjust the amount of light. As the control circuit 2, a circuit configuration as shown in FIG. 14 is also considered. In this configuration, the first pulse generator 25a having a constant output cycle and the second pulse generator 25a having a variable output cycle
Of the first pulse generator 25a (FIG. 15 (a)) during the ON period of the output (FIG. 15 (b)) of the second pulse generator 25b. It is set to be longer than the period. The output of the first pulse generator 25a is input to the K terminal of the JK flip-flop 27, and the output of the second pulse generator 25b is connected to the reset terminal C of the JK flip-flop 27 and the counter 28. Is entered.
The counter 28 is reset by the fall of the output of the non-inverting output terminal Q of the JK flip-flop 27 (FIG. 15 (g), the output of the inverting output terminal of FIG. 15 (h)). During the period when the output level of the non-inverting output terminal Q of the -K flip-flop 27 is "H", the number of output pulses of the second pulse generator 25b is counted. The output of the counter 28 (FIGS. 15 (c) to (e)) is 3 bits and is input to the first comparator 29a and the second comparator 29b. From the counter 28, the output of the counter 28 becomes maximum (all output levels are “H”), and at the same time, the carry signal (15th
(F) is output, and the carry signal is input to the J terminal of the JK flip-flop 27. Therefore, when the output of the second pulse generator 25b first falls after the output of the first pulse generator 25a rises, J-K
The flip-flop 27 is reset and the non-inverted output terminal Q
Output falls, and this fall causes the counter
28 is reset. The counter 28 counts the fall of the output of the second pulse generator 25b after being reset, and the carry signal falls at the next fall of the maximum value. When the carry signal falls, J-
The K flip-flop 27 sets the output level of the non-inverting output terminal Q to “H”. Further, the operation of the counter 28 stops, and all the output levels become “L”. This state continues until the output of the second pulse generator 25b falls first after the output of the first pulse generator 25a rises next. By the way, the first comparator 29a and the second comparator 29b have a first toning setting unit 20a comprising a 3-bit digital switch for setting a switching timing from red to green and a switching timing from green to blue, respectively. A second toning setting unit 20b is connected so that comparison with the output value of the counter 28 is performed. Therefore, the outputs of the first comparator 29a and the second comparator 29b are output from the first toning setting unit 20a and the second toning setting unit 20b.
15 (i) and (j) fall in accordance with the set values in the above. The output of the inverting output terminal of the J-K flip-flop 27, the output of the first comparator 29a and the second comparator 29 b, 2 pieces of inverters 26a, 26b and three NAND circuits 26 _R, 26 _G, 26 It is input to the logic circuit portion made of _B, the output terminal _{O R, O G, O B} , the output such as FIG. 15, respectively from _{O C (k) ~ (n} ) is obtained. Therefore, in this circuit configuration, the repetition period is set to the first
Is constant by the output of the pulse generator 25a, and the mixing ratio of each emission color is adjusted by the first toning setting unit 20a and the second toning setting unit 20b to perform toning, and the length of the non-emission period is adjusted. The dimming is performed by adjusting the pulse width by the output cycle of the second pulse generator 25b.

[Problems to be solved by the invention]

By the way, if dimming is performed without changing the emission color, the above-described control circuits 2 perform the following control. That is, in the circuit configuration shown in FIG. 9, the light emission time of each emission color is fixed and the repetition period is adjusted. In the circuit configuration shown in FIG. 11 and the circuit configuration shown in FIG. The repetition period is fixed, and the emission time of each emission color is adjusted without changing the ratio. On the other hand, it has been found that the relationship between the light output of the discharge lamp and the lamp current is as shown in the following table and FIG.
That is, if the emission colors are different, the rate of increase of the light output with the increase of the lamp current is different. For example, in our red (FPL36R), green (FPL36G), and blue (FPL36B) monochromatic fluorescent lamps, the rate of increase in light output with increasing lamp current, based on green, shows that red tends to decrease, Blue has an increasing trend. Therefore, as described above, when the light emission time or the non-light emission time is adjusted and the light emission time is adjusted in a state where the ratio of the light emission time of each light emission color is kept constant, the mixing of each light emission color according to the light adjustment level is performed. There is a problem that the ratio changes and the color changes. The present invention is aimed at solving the above problems,
An object of the present invention is to provide a variable color discharge lamp lighting device capable of dimming without causing a change in color.

[Means for Solving the Problems]

In order to achieve the above object, according to the configuration of claim 1, a discharge lamp capable of individually controlling the light output of different emission colors, and a desired color mixture can be obtained with a desired light amount by adjusting the light output of each emission color. A control circuit for controlling the power supplied to the discharge lamp,
A correction means for correcting the power supplied to the discharge lamp so as not to change the ratio of the light output of each emission color when adjusting the light quantity is provided. In the configuration of the second aspect, the control circuit controls the color mixture by causing the light emission periods of the respective light emission colors to be different from each other and causing the light emission to be circulated, and controls the light amount by adjusting the light emission time of each light emission color. It is. In the configuration of the third aspect, the correction means is provided in the control circuit. In the configuration of the fourth aspect, the correction means is provided separately from the control circuit.

[Action]

According to the above configuration, since the correction means for changing the entire light amount without changing the ratio of the light amount of each emission color is provided, a discharge lamp whose change rate of the light amount changes according to the supplied power is used. Even in this case, the overall light quantity can be changed without changing the ratio of the light quantity of each emission color, and the light can be adjusted without changing the color.

Embodiment 1 As shown in FIG. 1, a single-color fluorescent lamp having different emission colors is used as discharge lamps 1 _R , 1 _G and 1 _B.
The lighting circuit 3 is configured by inserting a current limiting element r and switching elements S _R , S _G , S _B composed of transistors between 1 _R , 1 _G , 1 _B and the power supply E. Switching elements S _R , S _G , S _B on,
The control circuit 2 for controlling turning off is constituted by an oscillation circuit 31 composed of an astable multivibrator and three monostable multivibrators 32 _R , 32 _G and 32 _B. The oscillation circuit 31 and the monostable multivibrators 32 _R , 32 _G , and 32 _B are configured by externally attaching components to a timer integrated circuit (for example, μPC1555C manufactured by NEC Corporation). Oscillator circuit 31 includes resistors R _1, R ₂ and outputs a square wave oscillation period and duty ratio is set by the capacitor C ₁ (FIG. 2 (a)), to trigger the monostable multivibrator 32 _B. Each monostable multivibrator 32 _R, 32 _G, 32
_B is triggered when the input to the terminal of the integrated circuit falls, and sets the output level of the terminal to “H”. After that, when the potential of the terminal becomes higher than the voltage applied to the terminal, the output level of the terminal becomes “L”. "Is configured to be. Each monostable multivibrator 32 _R, 32 _G, 32 _B of the terminal, the series circuit of which is connected across the power source E ₁ to the control circuit 2 and the resistor R ₃ to R ₅ capacitor C ₃ -C ₅ There has been so connected respectively, each capacitor C ₃ -C ₅ is reset by the trigger input to the terminal. The output of the monostable multivibrator 32 _B through a differential circuit composed of the resistor R ₆ and the capacitor C ₆ triggers the monostable multivibrator 32 _G, the output of the monostable multivibrator 32 _G, the resistance R ₇ and triggers the monostable multivibrator 32 _R via a differentiating circuit composed of a capacitor C _7. Accordingly, the potential at the connection point of the respective monostable multivibrator 32 _R, 32 _G, 32 _B is triggered, and a resistor R ₃ to R ₅ and capacitor C ₃ -C _5, the second view (b) ~ ( d), and
(For each monostable multivibrator _{32 R, 32 G, 32 B} , respectively V _R, V _G, is set to V _B) The potential voltage applied to the terminal until the output level becomes "H" (second 2 (e)-(g)). Each monostable multivibrator 32 _R , 32
The output of the _G, 32 _B, the switching element S _R, S _G, is input to the control terminal of the S _B (base), each switching element S _R to the output level is "H" period, S _G, the S _B Turn on each one. Incidentally, the voltage applied to the terminals of the integrated circuit is set by the correction means comprising a resistor R ₈ to R ₁₆ and possible resistance VR. That is, the connection point of the series circuit of the resistors R ₈ , R ₉ , R ₁₀ , R ₁₁ , R ₁₂ , R ₁₃ connected between both ends of the power supply E ₁ is connected to the terminal, and each resistor R ₈ , R ₁₀ , to one end of the R ₁₂ variable resistor VR
The one end of the connection, between the other ends of the variable resistor of the resistors _{R 8, R 10, R 12} , resistor R ₁₄ to R ₁₆ are inserted. In such a configuration, when the resistance value of the variable resistor VR is increased, the voltage applied to the terminal decreases, and the lower the voltage applied to the terminal, the greater the decrease rate. As described above, when green is used as a reference, the rate of decrease in light output when the lamp current decreases is such that blue tends to decrease and red tends to increase, and the lamp current increases as the voltage applied to the terminal increases. Therefore, when the applied voltages corresponding to red, green, and blue are V _R , V _G , and V _B , respectively, the relationship is set so that the relationship of V _R <V _G <V _B is satisfied. In the above configuration, by setting the resistor R ₃ to R ₅ and capacitor C ₃ -C ₅ appropriately, the mixing ratio of the emission color 1: 1:
It is assumed that white light having a color temperature of about 650 ° K is obtained by setting the value to 1. In this state, if the resistance value of the variable resistor VR is adjusted to be large, each monostable multivibrator 32
_R, 32 _G, 32 percentage of the period in which the output level is "H" of _B, if based on the green, red is reduced, so that the blue is increased. That is, as the voltages V _R , V _G , and V _B applied to the terminals change, the charging time of the capacitors C _{3 to} C ₅ is shortened as shown in FIGS. Is “H”
Are changed as shown in FIGS. 2 (k) to 2 (m). The rate of change of the charging time of the capacitor C ₃ ~C ₅ is, blue,
Since green and red increase in order, if the period of “H” in the original state is 1: 1: 1 as shown in FIGS. 2 (e) to 2 (g), after the change, As shown in FIGS. 2 (k) to 2 (m), blue is longer than green and red is shorter than green. As described above, the color temperature can be kept constant by correcting the lamp current after dimming. When performing toning it may be changing the value of the resistor R ₃ to R ₅ and capacitor C ₃ -C _5. Also, the resistor R ₈ to R ₁₆ and a variable resistor VR, the discharge lamp 1 _R, 1 _G, are of course set according to the characteristics of the 1 _B.

Second Embodiment A lighting circuit 3 in the present embodiment is the same as that in the first embodiment. As shown in FIG. 3, the control circuit 2 controls the discharge lamps 1 _R , 1 _G ,
1 _B discharge lamp 1 characteristic together at each dimming level of _R, 1 _G, 1 memory 33 in which data such as to define a light emission time of _B is stored
It has. The memory 33 is, for example, a ROM, and has 14-bit address terminals A _{0 to} A ₁₃ and 3-bit or more data terminals D _{0 to} D _2.
And The highest-order address terminal A ₁₃ is “H”
(Hereinafter, 1 to) the toning time, "L" (hereinafter, 0 to) a of selecting dim when the switch SW ₁
So that the switching input of the address terminals A ₁₃ by. The data terminals D _{0 to} D ₂ control the switching elements S _R , S _G , S _B of the lighting circuit 3 respectively. When the output is 1, the switching elements S _B , S _G , S _{Turn B} on. Data stored in the address most significant bit is 0, a data for dimming data corresponding to the data terminal D ₀ to D ₂ are set as follows. That is, the upper 6 bits of the address except the most significant bit are used to select the dimming level. For example, “000000” indicates that the light amount is 1
00%, “000001” is 80%, “000010” is 60%, “000011”
Is set to 40%. For each light amount, the lower 7 bits (0 to 127) of the address store data as shown in the table below. The above table shows that, for example, data for dimming the light amount to 60% (that is, the upper 7 bits of the address are “00000010”)
Those lower 7 bits of the address of the data corresponding to the data terminal D ₂ is from 0 to 82 ( "0000000" - "1010010") is 1
And 83 to 127 (“1010011” to “1111111”) are 0
Means that Therefore, the amount of light
When set to 60%, the lower 7 bits are changed from 0 to 127
When the output is increased by one, the outputs of the data terminals D _{0 to} D ₂ become 1 in the first half and 0 in the second half. Among the address terminals A _{0 to} A ₁₃ of the memory 33, the lower 7 bits include a counter for counting the rise of the clock signal ck.
34 outputs are input, and the state of increasing by one from 0 to 127 is repeated. The output of the up / down counter 35 is input to upper 6 bits of the address terminals A _{0 to} A ₁₃ of the memory 33 except for the most significant bit.
The address can be selected by the output of the up / down counter 35. The clock signal ck is input to the up / down counter 35, counts up in synchronization with the clock signal ck while the up switch SWu is operated, and synchronizes with the clock signal ck while the down switch SWd is operated. Count down. According to the above configuration, select the dimming switch SW _1, by selecting the address corresponding to the desired amount of light by the up-down counter 35, the data stored in the lower 7 bits of the address are sequentially read, Data terminal
Corresponding discharge lamp during a period from D ₀ to D ₂ 1 is outputted
1 _R , 1 _G , and 1 _B light up. In this way, the discharge lamps 1 _R , 1 _G , 1 _B depend on the value stored in the lower 7 bits of the address.
Can be set arbitrarily, so that when dimming in accordance with the characteristics of the discharge lamps 1 _R , 1 _G , and 1 _B , it is possible to set data that does not cause a color change. is there. In short, data corrected in advance according to the characteristics of the discharge lamps 1 _R , 1 _G , and 1 _B is stored in the memory 33, and the memory 33 functions as a correction unit.

Embodiment 3 In the above-described embodiment, the control circuit 2 incorporates correction means for correcting the lamp current in accordance with the characteristics of the discharge lamps 1 _R , 1 _G , and 1 _B when the light amount is changed. However, in this embodiment,
As shown in FIG. 4, an example is shown in which a correction circuit 4 is inserted between the conventional control circuit 2 and the lighting circuit 3 to correct the lamp current at each light quantity. here,
The output terminals O _R of the correction circuit _{4 ', O G', O} B ' , the switching element S _R of each lighting circuit 3, S _G, is connected to the S _B. The control circuit 2 is assumed to have the same circuit configuration as that shown in FIG. However, the output “H” and “L” are opposite,
Output O _C is assumed to be omitted. The correction circuit 4
Via the output terminals O _R of the control circuit 2, O _G, and O NOT circuit for inverting the output from _{B 36 R, 36 G, 36} B, and a buffer 37 _R, 37 _G, 37 _B made of the voltage follower To charge the capacitors C _R , C _G , and C _B. Further, the correction circuit 4 includes monostable multivibrators 38 _R , 38 _G , and 38 _B corresponding to each emission color, and each monostable multivibrator 38 _R , 38 _G , 38 _B includes a resistor Re provided at an output terminal. RRg and capacitors Ce〜Cg so as to be sequentially triggered through a differentiating circuit. The time constant of each monostable multivibrator 38 _R , 38 _G , 38 _B is represented by a resistor R
It is set by a series circuit of h to Rj and capacitors Ch to Cj. One end of each of the capacitors C _R , C _G , and C _B is a resistor
_R R, C _G, is connected to a connection point between via R _B resistance Rh~Rj and capacitor Ch～Cj. Start the correction circuit 4 having the above structure, when subjected to dimming without changing the ratio of the light emission period by the control circuit 2, a capacitor C _R The shorter the light emission period, the rise of C _G, the terminal voltage of C _B Is faster. Therefore, the capacitor
Rising of the terminal voltage of Ch~Cj becomes far, is the output pulse width of each monostable multivibrator 38 _R, 38 _G, 38 _B is narrowed. That is, the output of the control circuit 2 is reflected on the outputs of the monostable multivibrators 38 _R , 38 _G , and 38 _B. Here, if the values of the resistors R _R , R _G , and R _B are appropriately set, the ratio of the change in the pulse width of the output from the correction circuit 4 to the change in the pulse width of the output from the control circuit 2 is determined for each light emission. It can be changed for each color. Discharge lamp 1 _R , 1 _G ,
Mode according to the characteristics of the 1 _B is to become possible. That is, if the resistances R _R , R _G , and R _B are set so that R _R <R _G <R _B, the output from each output terminal O _R , O _G , and C _{B of} the control circuit 2 is equal to the 5 view (a) ~ the terminal voltage of the capacitor Ch~Cj when seems that the (c) is as shown in FIG. 5 (d) ~ (f), the output terminals O _R of the correction circuit 4 ', O _G ', O _B' output from is as FIG. 5 (g) ~ (i). Here, as in Fig. 5 left half, the output terminals of the correction circuit _{4 O R ', O G'} , O B '
When the output pulse width of the control circuit 2 is controlled to be narrowed as shown in the right half of FIG. _R ′,
O _G ', O _B' the pulse width output from it can be varied for each light emitting color. According to the above arrangement, since an automatic offset correction circuit 4 separately, the conventional circuit configuration can simply adding the correction circuit 4, corresponding to the discharge lamp 1 _R, 1 _G, 1 difference in the properties of the _B It will be easier. Note that the correction circuit 4 in the present embodiment is configured by an analog circuit, but may be configured by using a memory as in the second embodiment.

Fourth Embodiment As shown in FIG. 6, this embodiment corresponds to each of the discharge lamps 1 _R , 1 _G , 1 _B between the correction circuit 4 and the discharge lamps 1 _R , 1 _G , 1 _B. In addition, dimming lighting devices _5R , _5G , and _5B are provided. Each dimming lighting device 5 _R, 5 _G, 5 _B, when the dimming signal is input, is configured to vary the lamp current to a corresponding each of the discharge lamp 1 _R is, 1 _G, 1 _B For example, in high-frequency lighting, the frequency is changed according to a dimming signal. Further, the lamp current can be made to flow continuously without providing a rest period. In addition, the lighting circuit 3 may turn on the discharge lamps 1 _R , 1 _G , and 1 _B sequentially, or may turn on the discharge lamps 1 _R , 1 _G , and 1 _B simultaneously. In each of the above embodiments, when the light amount is reduced, blue,
The lamp current is corrected so as to increase in the order of green and red.However, it goes without saying that the correction method may be changed according to the characteristics of the discharge lamps 1 _R , 1 _G , and 1 _B to be used. is there. Furthermore, although the lighting circuit 3 is exemplified by a DC lighting, it does not prevent the application of the technical idea of the present invention to the AC lighting or the high frequency lighting. In the embodiment, the radiant lamps 1 _R , 1 _G , and 1 _B of each emission color are separate, but a discharge or the like that emits a plurality of colors in one outer tube as shown in the conventional example is used. Can also.

【The invention's effect】

As described above, since the present invention is provided with the correction means for changing the overall light amount without changing the ratio of the light amount of each luminescent color, the discharge lamp whose light amount change rate changes according to the supplied power Is used, it is possible to change the overall light quantity without changing the ratio of the light quantity of each emission color, and there is an advantage that the light can be adjusted without changing the color.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention, FIG. 2 is an operation explanatory diagram of the same, FIG. 3 is a circuit diagram showing a second embodiment of the present invention, and FIG. 4 is a third embodiment of the present invention. FIG. 5 is a block diagram showing a fourth embodiment of the present invention, and FIG. 7 is an example of a discharge lamp used in the variable color discharge lamp lighting device according to the present invention. , FIG. 8 is a circuit diagram showing a basic configuration of the above, FIG. 9 is a circuit diagram showing a conventional control circuit, FIG. 10 is an operation explanatory diagram of the above, and FIG. 11 is another conventional control circuit. FIG. 12 and FIG. 13 are circuit diagrams showing configuration examples of the circuit, FIG. 12 and FIG. 13 are operation explanatory diagrams of the same, FIG. 14 is a circuit diagram showing a configuration example of still another conventional control circuit, and FIG. Figure, No.
FIG. 16 is an operation explanatory diagram for explaining a problem of the conventional example. 1,1 _R , 1 _G , 1 _B ... discharge lamp, 2 ... control circuit, 3 ... lighting circuit, 4 ... correction circuit.

Continuation of front page (56) References JP-A-61-148799 (JP, A) JP-A-61-42849 (JP, A) JP-A-62-79400 (JP, A) JP-A-3-60000 (JP) JP-A-3-118594 (JP, A) JP-A-63-55887 (JP, A) JP-A-62-163290 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB Name) H05B 41/36 H05B 41/38-41/42

Claims (4)

(57) [Claims] 1. A discharge lamp capable of individually controlling the light output of different emission colors, and controlling the power supplied to the discharge lamp so as to obtain a desired amount of color mixture by adjusting the light output of each emission color. A variable color discharge lamp lighting device, comprising: a control circuit for adjusting the amount of light output, and a correction circuit for correcting the power supplied to the discharge lamp so as not to change the ratio of the light output of each emission color when adjusting the amount of light. . 2. The control circuit according to claim 1, wherein the control circuit controls the color mixture by causing the light emission periods of the respective light emission colors to be different from each other and causing the light emission to circulate, and controls the light amount by adjusting the light emission time of each light emission color. The lighting device for a variable color discharge lamp according to claim 1, wherein: 3. The variable color discharge lamp lighting device according to claim 1, wherein said correction means is provided in a control circuit. 4. The variable color discharge lamp lighting device according to claim 1, wherein said correction means is provided separately from a control circuit.