JPS5919637B2 - flashlight device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flash lamp device such as a xenon wrap or krypton lamp that generates high intensity light.

For example, flashlights such as xenon lamps are used as approach lights for airplanes at airports by appropriately blinking them.

The flashing circuit (flasher circuit) for this type of flash lamp has conventionally used the circuit shown in FIG. In this Figure 1,
1 is an AC power supply, 2 is a transformer, 3 is a rectifier circuit, 4 is an impedance element, 5 is a capacitor, 6 is a flash lamp, and 1 is a trigger generation circuit. The capacitor 5 is connected in parallel to the flash lamp 6, and the charged electric charge is discharged to the flash lamp 6 in the manner described later, thereby lighting the flash lamp 6 for a short time. The trigger generation circuit □ consists of resistors 8 and 9 that divide the rectified power supply voltage, a capacitor 10 connected in parallel to one of the resistors 9, and the charge of the capacitor 10 at an arbitrary time interval, such as the blinking interval of an airplane approach light. In this case, the blinking control switch 11 is discharged at intervals of about 0.5 seconds, the trigger transformer 12 induces a high voltage in the secondary coil by discharging the capacitor 10, and the trigger transformer 1.
2 and a nearby conductor 13 that applies a secondary high voltage of 2 to the flash lamp 6. The operation of this circuit of FIG. 1 will be explained.

First, when the AC power supply 1 is turned on, the capacitor 5 is charged via the impedance element 4, and at the same time, the capacitor 10 of the trigger generation circuit T is also charged. At this time, the terminal voltage of the charged capacitor 5 is V, the minimum continuous discharge voltage of the flash lamp 6 is ■, and the spontaneous discharge starting voltage of the flash lamp 6 is V.
, then V is set so as to maintain the relationship V0<V, <V. In other words, even if the capacitor 5 is charged to V, the flash lamp 6 does not start discharging only with this voltage V1. Incidentally, the flash lamp 6 is, for example, a xenon lamp, and Vo is 1800 volts and V is 20 volts.
00 volts and V2 is about 2300 volts. next,
When the flashing control switch 11 of the trigger generation circuit T is turned on while each capacitor 5, 10 is charged, the charge stored in the capacitor 10 is rapidly discharged through the primary coil of the trigger transformer 12. For example, approximately 1000
A high voltage V3 of 0 volts is applied. Then, a potential difference of about 8,000 volts (V3-V1) is generated between the electrode of the flashlamp 6 and the adjacent conductor 13, a faint discharge is generated there, and the gas inside the flashlamp 6 is ionized. Due to this ionization, the flashlamp 6 can be discharged even at a voltage V smaller than V, and the charge stored in the capacitor 5 discharges inside the flashlamp 6, reducing the energy consumed at this time. Emitted as a flash of light. By repeating the above steps, the flash lamp 6 blinks. By the way, in the conventional circuit described above, the luminous intensity of the flash lamp 6 is always constant and cannot be changed arbitrarily.

Therefore, for example, when the flashlight 6 is used as an approach light at an airport, if the light intensity is constant, it cannot be adapted to the surrounding conditions (weather conditions, background brightness, etc.). For example, when visibility at an airport is good, it may cause psychological distress to pilots, and in such cases the luminous intensity is reduced, and when visibility is poor due to fog, the luminous intensity is increased. There was a strong demand for flashlights that would make airports easier to find and identify. In view of the above points, the present invention provides a flash lamp with variable luminous intensity, and the configuration of the present invention will be explained below with reference to the drawings.

Now thinking about the flashlight 6 above, this flashlight 6
The energy E for the light emission is the capacitance of the capacitor 5 as C
It is expressed as .

Therefore, it can be seen that in order to vary the luminous intensity of the flash lamp 6, it is sufficient to make V or C variable. Based on this idea, the present invention has developed a flash lamp device having the following circuit configuration. That is, in the voltage V, variable dimming system device shown in FIG. 2, 14 is an AC power supply, 15 is a flash lamp, and 16 is a trigger generation circuit, and this trigger generation circuit 16 has the same contents and operation as the conventional one described above. You can use one that does this.

Further, IT is a discharge circuit for discharging the flash lamp 15, and has a first discharge path A and a second discharge path B. The first discharge path A includes the transformer 18a, the rectifier circuit 19a, and the rectifier circuit 1.
It is composed of a first capacitor 20a charged with the power supply voltage rectified by 9a, and a first diode 21a incorporated in a parallel circuit of the first capacitor 20a and the flash lamp 15.
The second discharge path B includes, for example, a transformer 18b whose primary coil has a variable number of turns using a variable voltage switch 22, a rectifier circuit 19b, and a second capacitor 20b charged with the power supply voltage rectified by the rectifier circuit 19b. , a second capacitor 20b and a second diode 21b incorporated in the parallel circuit of the flash lamp 15. Then, the following relationship is set for the first and second discharge paths A and B. First, the first discharge path A
When the capacitance of the first capacitor 20a is Ca and the terminal voltage of the charged first capacitor 20a is Va, Va
is set to <Va<V2.

However, V. is the minimum continuous discharge voltage of the flash lamp 15, V
, is the spontaneous discharge starting voltage. On the other hand, if the capacity of the second capacitor 20b in the second discharge path B is Cb, and the terminal voltage of the charged second capacitor 20b is Vb, then Vb<
Set so that V; a. This '9 Va can be adjusted by the voltage variable switch 22. And Ca《
For example, Cb is set to be approximately 30 times larger than Ca. Further, let Ea be the discharge energy due to the charge of the first capacitor 20a, and let Eb be the discharge energy due to the charge of the second capacitor 20b.

According to the above relationship, the flash lamp 15 discharges in the following order.

That is, when the variable voltage switch 22 is set to 0N at a required position and the AC power supply 14 is turned on, the first capacitor 20
a and the second capacitor 20b are charged respectively. At the same time, a capacitor (not shown) of the trigger generation circuit 16 is also charged and operates in the same manner as described in FIG. 1 to ionize the gas in the flash lamp 15. Then, since Va>Vb, the electric charge charged in the first capacitor 20a is first discharged to the flash lamp 15 through the first diode 21a. At this time, the electric charge of the first capacitor 20a is transferred to the second diode 21b.
Therefore, it does not flow to the second capacitor 20b side.
Then, when the electric charge of the first capacitor 20a starts discharging, the lamp voltage of the flash lamp 15 decreases to below Vb, and at the point when it becomes below this Vb, the second capacitor 20b
is discharged to the flash lamp 15 through the second diode 21b. At this time, the charge of the second capacitor 20b is
The diode 21a prevents the current from flowing toward the first capacitor 20a. In other words, the first and second diodes 21a
, 21b isolates the charges charged in the first and second capacitors 20a and 20b to maintain stable operation. In this way,
The flashlight 15 discharges two consecutive times, and the first discharge causes -
The energy of CaVa2 is consumed, and in the later discharge -2C
The energy of bVb2 is consumed, and the luminous intensity is determined mainly by the later discharge with high energy.

Therefore, by switching the voltage variable switch 22 and changing Vb, the luminous intensity can be changed arbitrarily. still,
The voltage variable switch 22 can be switched manually or automatically in conjunction with a suitable photometer. In addition, when adjusting the luminous intensity by variable capacitance, for example, as shown in FIG. 3, a plurality of capacitors Cl, C, . . .
Select switch SL, S2... They can be connected in parallel via.

Then, by selectively turning on one of the selection switches Sl, S2, . . . , the capacity is changed and the luminous intensity of the flash lamp 15 is determined. This variable capacitance method has problems with the current capacity and withstand voltage between the contacts of the selection switches S,, S2, etc., so V1 at o<V1 and V2 is relatively low voltage, and the capacitors C,, S2... This is suitable when the capacity selected by , . . . is small. As explained above, according to the present invention, it is possible to adjust the luminous intensity to an arbitrary level, whereas the conventional flashing lamp only flashed at a constant luminous intensity.Therefore, the field of application of flashing lamps has expanded, for example, when entering an airport. When used as a light, the luminous intensity can be changed according to various weather conditions, making a major contribution to the safe operation of airplanes.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional flash lamp device, FIG. 2 is a circuit diagram showing an embodiment of a flash lamp device according to the present invention, and FIG. 3 is a circuit diagram showing an application example of the present invention. 15...Flash lamp, 16...Trigger generation circuit, 17...Discharge circuit, 20a...
First capacitor, 20b...Second capacitor,
21a...First diode, 21b...
・Second diode.

Claims (1)

[Claims] 1 A first capacitor charged with a predetermined voltage between the minimum continuous discharge voltage of the flash lamp and the natural discharge start voltage;
A discharge circuit includes a second capacitor that is larger than the capacitance of the capacitor and is charged at an arbitrarily selected voltage, each separately connected in parallel to the flashlamp through a diode, and a discharge trigger voltage is applied to the flashlamp at a required time interval. a trigger generation circuit that triggers the flashlamp with the trigger voltage, and then causes the flashlamp to discharge the charge in the first capacitor;
A flash lamp device characterized in that the luminous intensity can be arbitrarily selected by discharging the charge in the second capacitor.