JPH01137598A - Lighting device for discharge lamp - Google Patents

Abstract

PURPOSE:To surely light a discharge lamp when the lighting voltage of the discharge lamp is reduced with the elapse of the operating time by providing a voltage superimposition circuit control means increasing the output voltage of a voltage superimposition circuit in steps in response to the change of the cumulative operating time. CONSTITUTION:The magnitude of the output voltage of a voltage superimposition circuit 7 is controlled in response to the cumulative operating time of a discharge lamp 5, or the output voltage is controlled in response to the number of lighting occasions (number of high-voltage pulse application occasions) to prevent the defective lighting from occurring when the voltage change of the discharge lamp 5 is increased. When a new discharge lamp 5 is to be turned on, for example, a cumulative time detection section 9 is reset to the initial state by a reset means 10. The cumulative operating time is reset to 0 by this resetting, and a voltage superimposition circuit control section 11 controls the voltage superimposition circuit 7 to obtain the rated superimposed voltage. The discharge lamp can be stably kept on for a long time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a discharge lamp lighting device provided with a control means for stably lighting the discharge lamp over a long period of time.

[Conventional technology] Conventionally, discharge lamps have been used in various light source devices.

For example, the first conventional example disclosed in Japanese Patent Publication No. 62-3529 is a lighting device consisting of an AC power source, a ballast for a discharge lamp, and a high-voltage generator for the purpose of improving lighting performance and extending lamp life. In order to achieve this, a method has been adopted in which power is supplied to the high)1 generating section from the output of the ballast.

Furthermore, in the second conventional example disclosed in JP-A No. 58-75793, a high-voltage heavy rock circuit is provided in order to improve the lighting performance of the discharge lamp. This is achieved by using a circuit with fewer malfunctions. Furthermore, in the third conventional example of Utility Model No. 56-137399, the voltage generated by the high-voltage generator is changed in order to improve the deterioration in lighting performance when re-lighting immediately after extinguishing, which is a drawback of discharge lamps. The discharge lamp ignition device is provided with a vibrating control device.

[Problems to be Solved by the Invention] According to the above-mentioned conventional examples, the lighting performance of the discharge lamp has certainly improved, but there are still variations in the voltage during lighting of the discharge lamp and problems due to deterioration of the discharge lamp. Due to runaway discharge lamp voltage during the initial stage of lighting, lighting failures still often occur. According to the third conventional example, as a method for improving lighting performance, there is a method of detecting the temperature near the discharge lamp.
Alternatively, there is a method of providing a means equipped with a heat-sensitive device having a temperature change that substantially corresponds to the temperature drop over time after the discharge lamp is turned off, and changing the voltage generated by the high voltage generator when starting the discharge lamp.

However, this method has the disadvantage that it cannot deal with variations in voltage during lighting of the discharge lamp and runaway voltage of the discharge lamp at the initial stage of lighting due to deterioration of the discharge lamp.

The present invention has been made in view of the above points, and an object of the present invention is to provide a discharge lamp lighting device that can reliably light a discharge lamp even when the lighting voltage of the discharge lamp decreases with time of use. shall be.

[Means and effects for solving the problem] In the present invention, a circuit including an AC input section, a rectification smoothing section, a current control section, and a high voltage generation section is provided, and a voltage superimposition circuit is provided in this main circuit. An integrated time detection section that integrates the accumulated usage time, and a voltage superimposition circuit control means that increases the output voltage of the voltage superimposition circuit in stages in response to changes in the accumulated usage time, and high-voltage pulses applied for lighting. When the discharge lamp does not light up, the high-voltage pulse applying means is increased in stages to allow the discharge lamp to stably remain white for a long period of time.

Examples] Hereinafter, the present invention will be specifically described with reference to the drawings.

FIG. 1 shows the basic configuration of the first embodiment of the present invention, and the second embodiment shows the basic configuration of the first embodiment of the present invention.
The figure shows a specific circuit configuration of the first embodiment.

As shown in FIG. 1, the discharge lamp lighting device 1 includes an AC input unit 2 that receives AC input, a rectification and smoothing unit 3 that rectifies and smoothes the AC input, and a DC voltage that converts the DC voltage after smoothing into a certain DC voltage. The DC/DC converter 4 that exchanges the voltage and this DC/DC
A high voltage generating section 6 generates a high voltage using the output of the converting section 4 and applies a high voltage pulse to the 111 lamp 5 connected to the transformer T, and t) C/D from the output of the AC input section 2.
It is composed of a voltage superimposing circuit 7 that outputs a superimposed voltage to the output side of the C converter 4, a superimposed voltage control section 8 that controls the superimposed output of the voltage superimposing circuit 7, and the like. In addition, an AC input section 2, a rectification smoothing section 3, a DC/DC conversion section 4 forming a current control section,
The high voltage generator 6 constitutes a main circuit.

The high voltage generator 6 is used to apply a high voltage pulse to light the discharge lamp 5, and the voltage superimposition circuit 7 further uses the DC voltage pulse to light the discharge lamp 5 more reliably.
This is for superimposing a DC voltage of, for example, about 150V on the output of the /DC converter 4.

On the other hand, the superimposed voltage control section 8 includes an integrated time detection section that integrates the usage time using the AC voltage input to the AC input section 2, a reset means 10 that resets the integrated time to the initial state, and a reset means 10 that detects the integrated time. The voltage superimposing circuit control section 11 determines the superimposed voltage to the voltage superimposing circuit 7 based on the detection signal of the voltage superimposing circuit 7.

By providing the above-mentioned type bone voltage control unit 8, the present invention provides a high voltage control unit that can eliminate the influence of the cumulative usage time of the discharge lamp 5, compared to the constant voltage type gas means in the conventional example.
A means for controlling shoulder pressure is provided.

Next, the operation shown in FIG. 1 will be explained below.

In FIG. 1, when an AC input is input to the AC input section 2, one is rectified and smoothed by the rectification and smoothing section 3, and the DC/D
The signal is input to the C converter 4. In the DC/DC conversion section 4, DC conversion is generally performed using a switching regulator method, and constant current control is performed so that a constant current is supplied to the discharge lamp 5 through a part of the high voltage generation section 6. Another of the AC inputs is supplied to the voltage superimposition circuit 7. This voltage Φ
In the tatami circuit 7, AC is converted to DC, and the DC-converted DC voltage (approximately 5 times the voltage of the output type 1 mo of the DC/DC converter 4) is applied to the DC/DC converter 4. output,
In other words, the light is superimposed between both electrodes of the discharge lamp 5. In order to avoid lighting the discharge lamp 5, first operate the DC/DC converter 4, and connect the two electrodes of the discharge lamp 5, that is, A is the positive electrode and K is the positive electrode.
For example, apply a voltage of approximately 30 V DC so that J3 becomes the negative electrode. Second, the voltage superimposition circuit 7 generates, for example, about DC1.
A voltage of 50 V is superimposed between the electrodes of the discharge lamp 5, i' and +f lTE. Thirdly, when a trigger pulse is generated by the starting circuit (not shown) of the high voltage generator 6,
A high voltage pulse is induced by the transformer T, and a high voltage of approximately 30 kV, for example, is applied between both electrodes of the discharge lamp 5. The high voltage pulse causes electrical leakage between the two electrodes of the discharge lamp 5, and discharge starts. Since about DCI 50V has already been applied between the two electrodes of the discharge lamp 5 by the voltage superimposing circuit 7, the discharge is further strengthened by that energy. Therefore, the electrodes of the discharge lamp 5 are heated to a sufficient extent to emit electrons, and the discharge lamp 5 shifts to stable discharge.

Next, the DC/DC converter 4, which is a main circuit for continuously supplying energy to the discharge lamp 5, operates to constantly detect the current of the discharge lamp 5 and perform constant current control. After that, the operation of the voltage superimposing circuit 7 is prohibited, and the discharge lamp 5 is kept in a constant continuous lighting state under the control of the DC/DC converter 4. In the present application, the discharge lamp 5 can be stably lit by changing the superposition of high voltage by the voltage superimposing circuit 7 according to the usage time, etc., as described above.

Conventionally, as described above, the voltage superimposed when lighting the discharge lamp 5 is set to about 150V DC. This value has a great influence on the lighting performance of the discharge lamp 5, and it has been found from experimental data that when it becomes low, for example, about 1] C100V, the discharge lamp 5 will have lighting failure. There is. In other words, this superimposed voltage is
Due to the variation in , it is necessary to select a positive value of l;L:+a.

Further, the discharge lamp voltage during continuous lighting of the discharge lamp 5 tends to increase as the usage time increases, and it is known that there is a correlation particularly with the quality of lighting performance. In other words, if the n-tatami voltage was set to a constant value as in the past, there was a big problem that lighting failures would increase as the usage time of the discharge lamp 5 increased. .

This invention solves this drawback, and the high voltage reporting circuit 6
The magnitude of the output voltage of 0? is controlled in accordance with the cumulative usage time of the discharge lamp 5. or bt, < is the number of times it lights up (
The output voltage is controlled in accordance with the number of high-voltage pulse applications), and 1! Even if the change in the voltage of the i-light 5 becomes large, lighting failures are prevented from occurring.

For example, when a new discharge lamp 5 is to be lit, the reset means 10 first resets the cumulative time detection section 9 to the initial state. This reset resets the accumulated usage time to O. Therefore, the voltage superimposing circuit control section 11 controls the voltage superimposing circuit 7 so that the voltage superimposing voltage becomes, for example, DC120.

In this case, since the discharge lamp 5 is new, D0120V
That's fine. The operating time is always integrated by the integrated time detection section 9. For example, when the integrated operating time reaches 200 hours, this information is input to the voltage superimposition circuit control section 11 as described above, and the superimposed voltage becomes DCl 50V. The voltage superimposition circuit 7 is controlled in this way. That is, as the usage time of the discharge lamp 5 increases, the lighting voltage of the discharge lamp 5 also increases. In response to this change, in the device of the present application, the voltage superimposition voltage is increased to absorb fluctuations in the lighting voltage of the discharge lamp 5. In this application, as an example, the superimposed voltage is controlled, but basically the superimposed energy is controlled, and not only the voltage but also the current, resistance value, etc. may be controlled.

In this way, it is possible to cope with the fact that as the usage time of the discharge lamp 5 increases, the discharge lamp voltage required for lighting the discharge pair 5 increases.

The specific circuit of the first embodiment shown in FIG. 2 will be explained below.

An AC signal (for example, △C100V501) is input from the AC input section 2.
1z) is manually input to the diode bridge D[31. The AC blockage is rectified by the diode bridge DB1 and smoothed by the condenser C1.

A smoothed DC voltage is generated between the two poles of the capacitor 1C1. One end of the primary side of 1 to lance T1 (conversion 1-lance) is connected to the positive electrode side, and the other end of the primary side is connected to the transistor Tr.
l's] director. The base of the transistor Tri is connected to the control ICl3 through a resistor R3. The node ICl3 outputs a drive pulse for increasing the switching dynamics of the transistor Tr1. +'+if note! - The emitter of the transistor Tr1 is connected to the zero pole side of the capacitor (C1).

One end of the secondary side of the 1 Herance T1 is connected to the diode D1, passes through the smoothing chimique L1, and is connected to the discharge lamp 5.
connected to the anode of. The other end of the secondary side of the transformer T1 passes through a resistor R1 that detects the current flowing through the discharge lamp 5, and is connected to the cathode K of the discharge lamp 5 via an ignition transformer T that is a part of the high voltage generator 6. has been done. A capacitor C2 for storing energy is connected in parallel with the discharge lamp 5.゛Voltage superposition circuit 7, voltage superposition circuit control section 11, product time detection section 9, reset means 10
is composed of a power transformer T2, triacs TAI to TA3, a counter 14, a selector 15, a reset switch 16, and the like. °The primary side of the power transistor is connected to the AC input section 2. In the first embodiment, the secondary side of the transformer T2 has three outputs, for example, 120V and 150V.
, 180V (7) A tap is provided so that the output can be selected. In addition, the output of each tap is a triac TA1.
~TA3 is connected to select and output any one tap output, and is connected to the capacitor C2 through a diode D2, a resistor R2, and a capacitor C3. A counter 14 for detecting the accumulation time is connected to the AC input section 2, the reset switch 16, and the selector 15, and the selector 15 selects only one of the triacs TΔ1 to TA3 as the product n of the discharge lamp 5. It is structured so that it can be selected according to the time.

The operation of a specific example of the first embodiment configured in this manner will be described below.

First, for example, 8C100V is input to the AC input section 2. The main circuit side is rectified by diode bridge D[31 and smoothed by capacitor C1. The control ICl3 is configured to detect the current of the discharge lamp 5 using a resistor R1 and control the transistor Trl so as to always supply a constant current to the discharge lamp 5. Since no current is flowing, a voltage corresponding to the turns ratio of the transformer T1 is output to the secondary side of the transformer T1.

Second, the secondary winding of transformer T2 has a diameter of 120 mm in this example.
Three voltages are output: V, 150V, and 180V. Now, assuming that the discharge lamp 5 is used for 0 hours, the triac A3 is selected by the selector 15, rectified and smoothed by the diode D2 and the capacitor C3, and a superimposed voltage is applied to the capacitor C2.

In other words, the voltage output from the voltage superimposition circuit 7 is added to the voltage output from the DC/DC converter 4, and the voltage between the poles of the discharge lamp 5 before lighting is approximately DCI 20V. Apply t'L Tee 6°E-1/2C
V2 [■ From 1, E= (1/2) x (C2> 2
This means that the superimposed energy of x(120)2 is stored in the capacitor C2. Thirdly, when the high voltage generator 6 causes leakage between both electrodes of the discharge lamp 5 via the transformer T, discharge is started by the superimposed energy. Therefore, since a current flows through the discharge lamp 5, the discharge lamp 5 is lit with a constant current due to the function of the control ICl3. After the light turns on, the triac TA3 is cut off,
The superimposed voltage is no longer applied.

Next, use f of discharge lamp 5? Considering the case where the open time is 00 hours, the selector 15 selects the triac TA2, and the output voltage of the transformer T2, that is, 150V, is applied to the capacitor C2 via the diode 1)2, the resistor R2, and the capacitor IJC3. applied. Therefore, the superimposed energy is E-(1/2)x (C2) 2x (1
50) It becomes 2. In other words, when the discharge lamp 5 is new, the superimposed energy is reduced, and as it gets older, the superimposed energy is increased, and a lighting method that responds to changes in the voltage of the discharge lamp 5 is used. Compared to this, the lighting performance is sufficiently improved. Further, the discharge lamp 5 can be lit stably for a long period of time, and the reliability of the discharge lamp lighting device can be improved.

In addition, when replacing the discharge lamp 5, press the reset switch 1.
6 is turned on to set the counter 14 to the initial state (loading time O hours).

FIG. 3 shows a discharge lamp lighting device 51 according to a second embodiment of the present invention.

This embodiment is basically the same as the first embodiment, so
The different superimposition circuit parts will be explained in detail. In this embodiment C, the voltage superimposition circuit 7 is composed of a DC/DC converter 52. A transistor Tr is connected to the output of the capacitor C1 of the rectifying and smoothing section 3 via the primary winding of the transformer T2.
2 are connected. Transistor Tr2 is resistor R6
is connected to the oscillator 53, and this oscillator 53
is controlled to start or stop its operation by turning on and off the photocoupler P1, and causes the transistor Tr2 to perform a switching operation. The secondary side of the transformer 1"2 is rectified and smoothed by a diode D2, a capacitor C3, and a resistor R2, and is connected to a capacitor C2 on the output side of the main circuit. Both ends of the capacitor C2 are connected to resistors R4 and R5.
The connection point between the resistors R4 and R5 is connected to a capacitor C to which the superimposed voltage of the voltage superimposing circuit 7 is applied.
2 is connected to one end of the input of a comparator 54 for detecting the voltage across the terminal. The input of the other end of this comparator 54 is connected to the photocoupler P for comparison with the pressure value of the superimposed type.
The resistor R8 is connected to the connection point of the resistors R9, R10, and R11 so that a reference voltage for turning on and off the resistor R8 is inputted. Resistance R9° [10. flll are connected to the collectors of the transistors Tr3゜1-R4, 1'r5, respectively, and the resistors R9, R10, R11 are connected to the collectors of the transistors Tr3゜TR4, 'rr5, respectively.
Then, the comparator 5 is set so that one of the superimposed voltages of 180 V, 150 V, and 120 V is applied to the capacitor C2.
A base Q voltage is applied to the input terminal of 4. 1 Helangister Tr
3. Tri-rr5 each passes through the selector 15,
It is connected to the reset switch 16 and the AC input section 2 via the counter 14 .

Therefore, similarly to the first embodiment, for example, the cumulative usage time is 0.
When lighting the discharge lamp 5 for a certain period of time, the transistor Tr5 is selected by the counter 14 and the selector 15,
The comparator 54 has a voltage M divided by resistors R8 and R11.
A quasi-voltage is input.

At the initial stage of lighting, the photocoupler P1 is on, and the oscillator 53 causes the transistor T r 2 to perform a switching operation. As a result, a voltage is induced on the secondary side of the transformer T2, and the voltage is applied to the capacitor C2 by the diode D2, the resistor R2, and the capacitor C3.

The reference voltage is set by the resistors R8 and R11 so that the tatami voltage is 20 VDC, so when the voltage across the capacitor C2 becomes 20 VDC, the resistor R
4, the comparator 54 detects it by R5, and the photocoupler P1
Turn off. Therefore, the superimposed voltage is set to Dol 20V and the oscillator 53 is stopped.

Thereafter, when a high voltage pulse is applied to the discharge lamp 5 by the high voltage generator 6 as in the first embodiment, the discharge lamp 5 is properly lit. Similarly, if the accumulated usage time of the discharge lamp 5 is 200 hours, the transistor Tr4 is selected, and as described above, the superimposed voltage is set to DC150V and the discharge lamp 5 is turned on. Therefore, as in the first embodiment, when the discharge lamp 5 is new, the superimposed energy is reduced, and when it is old, the superimposed energy is increased, thereby using a lighting method that responds to changes in the voltage of the discharge lamp 5. The lighting performance has been improved significantly compared to the conventional one. In this second embodiment, the number of commercial frequencies is 1
By using a DC/DC conversion means that performs DC/DC conversion by a factor of 00 or more, it is possible to increase the energy conversion efficiency and downsize the transformer.

Further, the level of the superimposed voltage is detected and the DC/DC converter 52
Since the drive can be turned on and off, a constant superimposed voltage can be supplied. Therefore, the lighting device is tJX! +''!, and the lighting performance is also improved.Furthermore, since a voltage that is higher than the voltage required for lighting is not unnecessarily applied, the life of the discharge lamp 5 can be extended.

FIG. 4 shows a specific example of the integrating circuit detecting section 9 for use of the discharge lamp 5 in the second embodiment.

The AC line on the non-ground side of AC input section 2 passes through resistor R12, and further passes through capacitor C4 and is connected to resistors R13 and R14.
, and is connected to one input terminal of the comparator 55. Resistors R13 and R1/1 are bias circuits. A reference voltage V2 is applied to the other input terminal of the comparator 55. Therefore, the output of the comparator 55 is the reference 711i1'
Since the AC signal input Vl is compared with fV2, it is converted into a pulse signal.

This pulse signal is integrated by the counter 14, and the multi-break 1J15 selects one of the transistors Tr3 to Tr5 based on the integrated value data.

Further, a backup power supply 56 is connected to the counter 14 in order to hold the data of the integrated value. In addition, a relay 1 switch 16 is connected to the counter 14 and the multiplexer 15, so that the accumulated data can be reset when the discharge lamp 5 is replaced.

FIG. 5 shows the basic configuration of a discharge lamp lighting device 61 according to a third embodiment of the present invention, and FIG. 6 shows its specific configuration.

In FIG. 5, the third embodiment differs from the embodiment shown in FIG. 1 in the method of controlling the voltage superimposing circuit control section 11. In the first embodiment, an accumulated time detection unit 9 for accumulating the operating time of the discharge lamp 5 and a reset means 10 are provided, and the superimposed voltage applied to the discharge lamp 5 is varied in accordance with the accumulated operating time of the discharge lamp 5. Was. In contrast, in this embodiment, the controller 6 controls the voltage superimposing circuit control section 11.
2 (specifically, the CPU 63), the control TC 13, which is a part of the current control unit, generates a discharge lamp lighting signal for determining whether the discharge lamp 5 is lit with Ij1 or not, and the discharge lamp 5 is lit. A high-voltage pulse application signal for generating a high-voltage pulse at the same time is calculated by CI
Apply the second high voltage pulse and apply the initial superimposed voltage (for example, D
If the discharge lamp does not light up (not lit), the discharge lamp lighting signal (does not light up) and the high-voltage pulse application signal (first time) are calculated, and when applying the second high-voltage pulse, the superimposed voltage is varied, for example, DCl 20V. (increase from 150v to DC150v)
They will try to turn the lights on again. In Figure 6,
The CP LJ 63 is connected to a control ICl3 that determines whether the discharge lamp 5 is lit or not, and a high voltage generator 6 that applies a high voltage pulse, and is used to set conditions for the second and subsequent lighting. Performing calculations. It is connected to the triacs TAI to TA3 in order to roughly vary the lighting conditions, that is, the superimposed voltage. Therefore, before starting the first lighting, the CPU 63 has selected the triac TA3, and the discharge lamp 5 has DC
A superimposed voltage of 20V is applied. A high voltage pulse is applied in this state. When the discharge lamp 5 lights up for the first time, C
The PU63 inputs the discharge lamp lighting signal (lit) and outputs the CP
LJ63 judges that the lighting is completed and turns the voltage superposition circuit 7 to 'If
1 (gi), the discharge lamp 5 shifts to steady lighting.On the other hand, if the discharge lamp 5 does not turn on due to the first high voltage pulse application, the CPU 63 outputs the 11i lamp lighting signal.
(does not light up), performs calculations with the signal that the high voltage pulse is applied for the first time, selects triac TA2 as the second lighting condition, and resets the heavy n voltage to DC1 50V. Therefore, the second time, lighting is started in a state where the superimposed voltage is 150V DC. In other words, with the above configuration, the 3rd, 4th
The superimposed voltage can be varied for the second and subsequent times.

Therefore, even if the discharge lamp 5 has large voltage variations and cannot be lit at one superimposed voltage value, the superimposed voltage is varied from the second time onwards, so it can be reliably lit, and the lighting performance is further improved. be able to.

Although this embodiment is a modification of the configuration of the first embodiment, it can also be applied to the second embodiment, and the same effect can be achieved by 1! '7.

Incidentally, in FIG. 6, the CPU 63 may be backed up by a backup power supply, and the lighting operation may be started from a voltage at least equal to the previous lighting condition at the next use.

Further, necessary data may be stored in a memory (not shown) attached to the CPU 63, and the memory storing the data may be backed up.

In addition, although the case where a switching regulator system is used as the discharge lamp lighting device of each of the above-mentioned embodiments has been described,
Other methods such as a chopper method may also be used. Further, in each of the embodiments described above, the width voltage control is performed using a counter, a multiplexer, a CPU, etc., but the voltage width may be changed over automatically (for example, by a changeover switch).

[Effects of the Invention] As described above, according to the present invention, the lighting performance of the discharge lamp can be improved because the discharge lamp lighting voltage is increased according to the usage time of the discharge lamp.

[Brief explanation of the drawing]

1 and 2 relate to a first embodiment of the present invention, FIG. 1 is a block diagram showing the basic configuration of the first embodiment, and FIG. 2 is a circuit showing the specific configuration of the first embodiment. 3 and 3 are circuit diagrams showing the specific configuration of the second embodiment of the present invention, and FIG.
FIG. 5 is a block diagram showing the basic configuration of the third embodiment of the present invention, and FIG. 6 is a specific circuit diagram of the third embodiment of the present invention. FIG. 2 is a circuit diagram showing the configuration. 1... Discharge lamp lighting device 2... AC input section 3...
- Rectification and smoothing section 4... DC/DC conversion section 5...
・Discharge lamp 6... High voltage generation section 7... Voltage superimposition circuit 8... Superimposed voltage control section 9... Accumulated time detection section 10... Reset means 11... Voltage type/view circuit control Part 5゜Procedure Master 11 Official Book (Voluntary) 1. Display of case 1986 patent application No. 295540
No. 2, Title of the invention Discharge lamp lighting 3. Relationship with the case of the person making the amendment Patent applicant representative Satoshi Shimoyama Department 4, Agent 6, Subject of amendment Drawings in the "Detailed description of the invention" section of the specification (Figure 3) 1. In the 11th line of page 3 of the specification, the statement "...decreased..." was corrected to "...increased...". 2. In the first line of the fourth page of the specification Yamanaka, the phrase "...high-voltage pulses are turned on..." has been changed to "...high-voltage pulses are turned on..."
The discharge lamp is lit..." is corrected. 3. In the 11th line of page 13 of the specification cylinder, [...[1
]..." should be corrected to "...[J]...". 4. In the 11th line of page 13 of the specification, there is a statement “...(C
2) 2..." should be corrected to "...(C2)...". 5. On the 7th line of page 14 of the specification, there is a statement that says “...(C2
)2..." should be corrected to "...(C2)...". Figure 3: 'Ichimasa ρ; 3: (Method) % formula % 1, Incident display 1986 Patent Application No. 295540
No. 2, Title of the invention Discharge lamp lighting device 3, Relationship with the person who made the amendment °11 Particulars [Example 1 Representative name of Yorito
Satoshi Yama Department 5, date of amendment order February 7, 1999 [1 (starting gate)
6. Subject of amendment November 10, 1988 EI (=
J submission Mo El = 1'2-Cf14J 1 to f i
(Japanese) November 10, 1988 Special.' [Director General Yoshi 1) Takeshi Moon 1, Indication of matter 1 1988 Patent Application No. 295540 2, Title of invention Discharge lamp lighting device 3 , Relationship with the case of the person making the amendment Temporary representative of the applicant Toshibe Shimoyama Name (7623) Patent attorney Susumu Ito
5. Date of amendment order (voluntary) 6. Subject of amendment "Detailed description of the invention" for specification
Column drawing (Figure 3) 7. Contents of amendments As shown in the attached sheet

Claims (1)

[Claims] A discharge lamp lighting device comprising: a main circuit that discharges a discharge lamp in a steady state; a voltage superposition circuit that outputs a superimposed voltage when starting the discharge lamp; and a high voltage generator that applies a high voltage pulse between electrodes of the discharge lamp. A discharge lamp lighting device according to claim 1, further comprising a superimposing circuit control means for controlling the superimposed voltage of the voltage superimposing circuit according to the usage time or number of times of use of the discharge lamp.