JPS5855599Y2 - Guidance light lighting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a guide light lighting device suitable for use in theaters, movie theaters, etc.

Generally used guide lights are equipped with a regular lighting circuit and an emergency lighting circuit, and their main purpose is to indicate evacuation routes in an emergency.

However, in theaters, movie theaters, hospitals, etc., there is a problem that the guide lights using regular lighting circuits are too bright, and there is a proposal to prevent glare by dimming the guide lights during theater performances, for example.

This proposal relates to a lighting device for a guide light suitable for such a proposal, and will be explained below using the drawings.

In the figure, 1 is an AC power supply, 2 is a ballast, and 3 is a fluorescent lamp. Normally, a starting circuit using a glow starter 4 is connected between the non-power side terminals of the fluorescent lamp 3 via the contacts of an emergency relay 5. has been done.

Reference numeral 6 denotes an emergency battery, which is normally connected to a charging circuit 7 connected in parallel to the AC power source 1, and is configured to be connected to the transistor inverter 8 by switching the contacts of the emergency relay 5 in an emergency. There is.

Reference numeral 9 denotes a positive resistor connected in series with the ballast 2 in an AC power supply circuit composed of an AC power supply 1, a ballast 2, and a fluorescent lamp 3, and 10 a short circuit provided in parallel with the positive resistor 9. It is a circuit.

This short circuit 10 is operated by a relay device 12 controlled by a separately provided control device 11.

Reference numeral 13 denotes a preheating transformer provided in parallel with the AC power source 1. A preheating circuit 14 provided in the preheating transformer 13 for detecting the electrodes of the fluorescent lamp 3 is connected to and connected to the short circuit 10 by the relay device 12. It is provided to be selectively switched.

The guidance light lighting device with such a configuration has short circuit 1.
0 is closed, it is the same as a general guide light. However, when the output of the fluorescent lamp 3 is to be reduced during a theater performance, for example, the control device 11 is closed manually, by a timer, or by any other means. is operated to open the short circuit 10 by the relay device 12 and close the preheating circuit 14 at the same time.

Therefore, current flows through the positive resistor 9, its impedance increases, and the light is dimmed in a stable state at a resistance value determined by the characteristics.

At this time, since a current is flowing through the electrodes through the preheating circuit 14, it is possible to compensate for the decrease in electrode temperature caused by the main discharge current, and to correct the adverse effect on the electrodes of the fluorescent lamp 3.

In addition, even when the light is turned off in this dimming state and then turned on again, the preheating of the electrodes necessary for starting can also be obtained through the preheating circuit 14, so the preheating through the circuit of the glow starter 4 due to the impedance of the positive resistor 9 is performed. Can supplement current.

Furthermore, it goes without saying that a sufficiently large amount of preheating can be obtained when the positive resistor 9 is cold and has a low resistance.

Note that if the connection is made so that the voltage generated by the preheating winding forming the preheating circuit 14 and the power supply voltage are added, the voltage applied to the glow starter 4 will be the sum of the power supply voltage and the preheating winding voltage.
It is possible to compensate for a drop in the voltage applied to the glow starter 4 due to a voltage drop across the positive resistor 9, thereby ensuring reliable operation during starting.

As explained above, according to the present invention, a positive resistor is used as the dimming impedance, and its short circuit,
A relay device is installed that can selectively switch the preheating circuit of a fluorescent lamp using a preheating transformer, so it is possible to use a fluorescent lamp whose starting circuit is a glow starter, resulting in an inexpensive and dimmable guide light without impairing its lifespan. can be provided.

[Brief explanation of drawings]

The figure is a circuit diagram of the lighting device according to the present invention, in which 1 is an AC power supply, 2 is a ballast, 3 is a fluorescent lamp, 4 is a glow starter, 6 is a battery, 8 is a transistor inverter,
9 is a positive resistor, 10 is a short circuit, 12 is a relay device,
13 is a preheating transformer, and 14 is a preheating circuit.

Claims (1)

[Scope of utility model registration request] A starting circuit including an emergency relay that detects the presence or absence of an AC power source, a battery connected to a transistor inverter via the emergency relay, and a glow starter selectively connected to the inverter or the AC power source by the emergency relay. a positive resistor provided in parallel with a short circuit connected in series with a ballast to the AC power supply circuit of the fluorescent lamp, and an AC power supply circuit having a preheating circuit for the electrodes of the fluorescent lamp. A guide light lighting device comprising: a preheating transformer connected in parallel with a power source; and a relay device capable of selectively switching between the short circuit and the preheating circuit.