JPS6115402Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a discharge ignition circuit for a gas lighter that uses a battery as a power source to discharge sparks.

For gas lighters in which the ignition circuit is switched on by operating an external control piece after opening the fire extinguishing lid, the blocking oscillator is activated and the capacitor is charged after the switch is turned on. The drawback is that it does not discharge until some time has elapsed. Therefore, by opening the fire extinguishing lid, an auxiliary switch is turned on to charge the capacitor with a certain amount of charge, and then a touch switch is turned on from the outside to transfer the charge charged in the capacitor to the step-up transformer. Although ignition circuits have been proposed that produce a flowing discharge spark, ignition circuits that utilize touch switches have the drawback of being complex and expensive.

In view of the above points, it is an object of the present invention to provide a discharge ignition circuit for a gas lighter that has an extremely simple configuration and can shorten the spark delay after turning on the switch.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is an ignition circuit diagram according to the present invention, in which a battery 1 is connected to a blocking oscillator 5 composed of an oscillation transformer 3 and a transistor 4 via an auxiliary switch 2 which is a normally open switch. A capacitor 7 and a switching element 8 of the capacitor 7 are connected in parallel to the output side of the capacitor 7 via a diode 6. Furthermore, the primary side of a step-up transformer 9 is connected to the closed circuit formed by the capacitor 7 and the switching element 8, a resistor 10 is connected to both ends of this primary side, and a resistor 10 is connected to the secondary side of the step-up transformer 9. Discharge electrodes 11 and 12 are provided. A normally closed switch 13 and a resistor 14 are connected in series to the positive side of the battery 1, and the resistor 14 is connected between the cathode side of the diode 6 and the capacitor 7.

Regarding the ignition operation, first, when the auxiliary switch 2 is turned on, the blocking oscillator 5 is activated, and the charge generated on the output side of the blocking oscillator 5 passes through the diode 6 and is stored in the capacitor 7; The electric charge is resistor 1
4. It is discharged through the normally closed switch 13, the auxiliary switch 2, the primary side of the oscillation transformer 3, and the primary side of the step-up transformer 9. The charging and discharging operations of the capacitor 7 are performed alternately according to the blocking oscillation, but the amount of charging and discharging per unit time is balanced when the potentials on the output side of the blocking oscillator 5 and the anode side of the capacitor 7 are equal. However, the potential on the anode side of the capacitor 7 does not increase any further and is kept at a constant value. If this value is Vc, Vc can be freely set by the value of the resistor 14, but it is usually determined by the breakdown voltage of the switching element 8 (referred to as V _BO ).
It is best to set it to around 80%. In this state, when the normally closed switch 13, which is the main switch, is operated to turn off, the discharge of the stored charge described above is stopped, so that the capacitor 7 is charged until the charging voltage reaches _VBO . This time is extremely short because V _C is set slightly lower than V _BO , and when capacitor 7 is charged to V _BO , the charge in capacitor 7 is transferred to switching element 8 by operation of switching element 8 . It flows transiently through the primary side of the step-up transformer 9, and generates discharge sparks between the discharge electrodes 11 and 12.

Next, a gas lighter using the above-mentioned ignition circuit will be explained based on FIGS. 2 to 5. A fire extinguishing lid 16 is rotatably attached to a hinge 15a at the upper end of the case 15. There are hanging feet 17 inside the
is fixed. Inside the case 15, an insulating chassis 18 housing the aforementioned ignition circuit components and a fuel tank 20 equipped with a nozzle 19 are arranged side by side. A cylinder spring 21 is resiliently installed on the holder 21 to facilitate the opening/closing operation of the fire extinguishing lid 16. This cylinder spring 21 comes into contact with an opening/closing plate 22 that engages with the nozzle 19, and a conductive plate 23 that contacts the case 15 is provided at the lower end of the opening/closing plate 22, and a lug plate 24 is provided below this conductive plate 23. are arranged. A lead wire leading out from the primary side of the oscillation transformer 3 shown in FIG. 1 and a lead wire leading out from the secondary side of the step-up transformer 9 shown in FIG. is battery 1
The auxiliary switch 2 is constituted by the lug plate 24 and the conductive plate 23 which is in contact with the + side of the battery 1 and is therefore connected to the + side of the battery 1 via the case 15.

A pair of walls 25 are formed on the upper side of the insulating chassis 18, and a U-shaped conductive frame 26 is guided by the walls 25 so as to be movable in the horizontal direction. An insulating operating body 27 is fixed inside the conductive frame 26 by engaging each hole 26a with a convex portion 27a.
A finger rest piece 28 exposed on the side of the case 15 is adhered to with double-sided adhesive tape 29. Further, a contact plate 30 disposed within the insulating chassis 18
A conductive spring 31 is elastically installed between the conductive frame 26 and the conductive frame 26 to urge the conductive frame 26 in a direction to contact the inner wall of the case 15. The conductive frame 26 is connected to the resistor 14 in FIG. 1 via the conductive spring 31 and the contact plate 30, while the case 15 is connected to the + side of the battery 1 as described above, and therefore the conductive frame The body 26 and the case 15 constitute the normally closed switch 13. Incidentally, claws 26b are formed on both sides of the conductive frame 26, and these claws 26b protrude into the window holes 25a formed in the wall 25 to prevent the conductive frame 26 from falling off the wall 25. is prevented.

An electrode stand 32 whose one end engages with the inner wall of the case 15 is mounted on the upper part of the insulating chassis 18, and a body cover 33 whose one end engages with the hinge 15a is mounted on the electrode stand 32. The main body cover 33 is covered with a windshield 34, and each of these members is fixed to the case 15 by fixing the electrode stand 32 and the main body cover 33 with screws 35. The discharge electrodes 11 and 12 in FIG.
Lead wire 3 led out and fixed to the electrode stand 32
6 and the nozzle 19, and the nozzle 19 is grounded via the fuel tank 20 and the case 15.

The ignition operation of the gas lighter is as follows. First, when the fire extinguishing lid 16 is opened, the opening/closing plate 22 is rotated by the cylinder spring 21, whereby the nozzle 19 is lifted and fuel gas is spouted.
moves downward and comes into contact with the lug plate 24, and the auxiliary switch 2 is turned on. When the auxiliary switch 2 is turned on, the blocking oscillator 5 operates and the capacitor 7
However, as mentioned above, since V _C of capacitor 7 is set slightly lower than V _BO , no spark discharge occurs. When the finger rest 28 is pressed inward in the case 15 in this state, the conductive frame 26 is guided by the wall 25 and moves horizontally, and the conductive frame 26 is moved into the case 15.
5. The normally closed switch 13 is turned off as it moves away from the inner wall. When the normally closed switch 13 is turned off, as described above, the charge in the capacitor 7 transiently flows to the primary side of the step-up transformer 9, causing a spark discharge between the tip of the lead wire 36 and the nozzle 19, and the spark is ejected first. ignites the fuel gas. In the fire extinguishing operation, when the pressing force on the acupressure piece 28 is released, the conductive frame 26 comes into contact with the inner wall of the case 15 again by the conductive spring 31, keeping the normally closed switch 13 in the on state, while the fire extinguishing lid 16
When the opening/closing plate 22 is closed, it returns to its original state, the nozzle 19 descends and the ejection of fuel gas stops, and the conductive plate 23 and lug plate 24 separate, turning off the auxiliary switch and extinguishing the fire.

The present invention is as described above, and in particular, a normally closed switch connected in series with the battery is connected between the cathode side of the diode and the capacitor, so that when the fire extinguishing cover is opened, the auxiliary switch is turned on, and the charging voltage of the capacitor is can be maintained at a charging voltage slightly lower than the breakdown voltage of the switching element, and therefore the spark delay after the normally closed switch is turned on can be reduced. Furthermore, if the case is grounded to the battery, the case can also serve as one terminal of the normally closed switch, making it possible to extremely simplify not only the circuit configuration but also the configuration of the normally closed switch itself. It becomes possible. Furthermore, the provision of the normally closed switch and resistor connected in series does not increase the current consumption of the battery.

[Brief explanation of the drawing]

Fig. 1 is an ignition circuit diagram according to the present invention, Fig. 2 is a longitudinal cross-sectional view of a gas lighter using an ignition circuit according to the present invention, Fig. 3 is a cross-sectional view of Fig. 2, and Fig. 4 is an operating state. The cross-sectional view and FIG. 5 are exploded perspective views of the switch portion. DESCRIPTION OF SYMBOLS 1... Battery, 2... Auxiliary switch, 5... Blocking oscillator, 6... Diode, 7... Capacitor, 8... Switching element, 9... Step-up transformer, 11, 12... Discharge electrode, 13... Normally closed switch, 14...resistance.

Claims (1)

[Scope of utility model registration request] A blocking oscillator is connected to the battery via an auxiliary switch that conducts and de-conducts depending on the opening and closing of the fire extinguishing lid, and a capacitor and a switching element of the capacitor are connected in parallel to the output side of the blocking oscillator via a diode. In a discharge ignition circuit for a gas lighter, the primary side of a step-up transformer is connected to a closed circuit formed by a switching element and a switching element, and a discharge electrode is provided on the secondary side of this step-up transformer. A discharge ignition circuit for a gas lighter comprising a normally closed switch and a resistor connected between the cathode side of the diode and the capacitor.