JPH0314787Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a lighting device using a straight fluorescent discharge tube, and particularly to an interlock structure thereof.

[Background of the idea]

In recent years, straight fluorescent discharge tubes have been lit using high frequency inverters and the like. In this case, since the starting voltage at the initial stage of lighting becomes considerably large, some kind of safety measure is required. Therefore, some proposals have been made to determine whether there is an abnormality in the fluorescent discharge tube by detecting the filament current of the fluorescent discharge tube, and to control the high-frequency inverter device. According to this, it is safe because the inverter oscillation stops when the straight fluorescent discharge tube is removed. However, since such a method makes the lighting device expensive, a simpler method is desired.

[Purpose of invention]

When a straight fluorescent discharge tube is removed from a lamp socket, the contact piece of the lamp socket is exposed. Touching this exposed part will result in an electric shock. The aim of the present invention is to provide a simple means for preventing such electric shock accidents.

[Summary of the idea]

The present invention comprises a straight fluorescent discharge tube having a lamp pin at the tube end and a lamp socket that removably holds the tube end of the straight tube fluorescent discharge tube. The present invention assumes an ordinary straight tube fluorescent lamp fixture that is equipped with a contact piece that comes into contact with and separates from the lamp pin.

In the present invention, a fixing piece is provided in the lamp socket at a position corresponding to the contact piece, which comes into contact with the contact piece when the contact piece comes into contact with the lamp pin and is displaced. By arranging the opening/closing section consisting of a pair of contact pieces and a fixing piece in the filament circuit of the straight fluorescent discharge tube, it functions as an interlock and improves safety.

[Example of idea]

The embodiments shown in FIGS. 1 to 4 will be described below. This straight tube fluorescent lamp fixture is a straight tube fluorescent discharge tube.
Equipped with FL, ballast CH, glow starter S, and noise prevention capacitor _C0 . Also, straight fluorescent discharge tube
Opening/closing parts 1 and 2 that open and close in conjunction with lamp pins 23 and 24 of the FL are arranged in the filament circuit of the straight fluorescent discharge tube FL. The opening/closing parts 1 and 2 are formed in the lamp socket 21.

As is well known, there are lamp pins 23 and 24 at the ends of the straight fluorescent discharge tube FL. On the other hand, the lamp socket 21 that removably holds the tube end has contact pieces 25, 26 corresponding to the lamp pins 23, 24.
is provided. Reference numeral 27 denotes a fixing piece provided at a position corresponding to the contact piece 25 in the lamp socket 21. The opening/closing part 1 or 2 is formed of the pair of contact pieces 25 and the fixing piece 27 described above. lamp pin 2
When the straight fluorescent discharge tube FL is rotated so that 3 and 24 are in the position shown in FIG. 4, the contact piece 25 comes into contact with the fixed piece 27. Thus, the opening/closing part 1 or 2
is closed. This point will be explained in more detail below.

The contact pieces 25, 26 of the lamp socket 21 come into contact with the lamp pins 23, 24 as shown in FIG. 4, or separate as shown in FIG. 3, as the straight fluorescent discharge lamp FL is rotated. Under the situation shown in FIG. 3, the contact piece 25 is not displaced, and the opening/closing portion 1 formed by it and the fixed piece 27 is opened. Under the situation shown in FIG. 4, the contact piece 25 comes into contact with the lamp pin 24,
The contact piece 25 is displaced by being pushed by the lamp pin 24,
A part of the displaced contact piece 25 comes into contact with the fixed piece 27. Thus, the opening/closing section 1 or 2 is closed.

Normally, the opening/closing parts 1 and 2 are closed, and the circuits leading to each filament of the straight fluorescent discharge tube FL are closed. When the straight fluorescent discharge tube FL is removed from the socket 21, the opening/closing parts 1 and 2 automatically open, and the interlock function is activated. As is clear from the circuit of FIG. 1, there is no risk of electric shock even if the contact pieces 25, 26 of each socket 21 are touched by hand under this condition.

FIG. 5 is a circuit diagram of another embodiment of the device, which includes a DC power source 2 and an inverter 3. The inverter 3 includes a transistor 4, an output transformer 5, a starting circuit 6, and the like. The output transformer 5 is provided with a primary winding 7, a bias winding 8, a secondary winding 9, and filament windings 10 and 11. The starting circuit 6 includes a resistor 12 and a capacitor 13. 14
is a capacitor, 15 is a chiyoke coil, and FL is a straight fluorescent discharge tube. 17, 18, 19, 2
0 is an opening/closing part that closes when the lamp pin device of the straight fluorescent discharge tube FL is used. This appliance uses a lamp socket 22 including opening/closing parts 17, 18, 19, 20 as shown in FIGS. 6 and 7.

The lamp socket 22 of FIGS. 6 and 7 is similar to the lamp socket 21 of FIGS. 3 and 4 described above.
The structure of the opening/closing part 17 including one contact piece 25 and the corresponding fixed piece 27 is the same, but a fixed piece 28 corresponding to the other contact piece 26 is further provided, and the contact piece 26 and the fixed piece 28 are Another set of opening/closing parts 18 is formed between them. Opening/closing parts 19, 2 in Fig. 5
0 is similarly formed in another lamp socket 22.

In a type having filament windings 10 and 11 as shown in FIG.
It is necessary to open the circuit appropriately.

[Effect of idea]

As explained above, the present invention is provided with an opening/closing part that opens and closes as the straight fluorescent discharge tube is rotated. Further, this opening/closing is constructed by a contact piece of the lamp socket and a corresponding fixing piece. According to this, when replacing a straight fluorescent discharge lamp, the electric circuit of the contact piece exposed from the lamp socket is automatically cut off, so there is no risk of electric shock.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a straight tube fluorescent lamp according to the present invention, Fig. 2 is a perspective view showing the lamp socket and the end of a straight fluorescent discharge tube, and Fig. 3 shows the opening/closing part in an open state. FIG. 4 is a sectional view of the lamp socket when the opening/closing part is closed. Figures 5 to 7 show other embodiments, of which Figure 5 is a circuit diagram showing the device of the other embodiment, and Figure 6 is a plan view of the lamp socket when the opening/closing part is in the open state. , FIG. 7 is a plan view of the lamp socket when the opening/closing part is in a closed state. 1, 2, 17, 18, 19, 20...opening/closing part, 2
3, 24... Lamp pin, 25, 26... Contact piece, 2
7, 28...Fixed piece.

Claims (1)

[Claims for Utility Model Registration] A straight fluorescent discharge tube having a lamp pin at the tube end and a lamp socket for detachably holding the tube end of the straight tube fluorescent discharge tube. In a straight tube fluorescent lamp fixture provided with a contact piece that comes into contact with or separates from the lamp pin as the lamp is rotated, when the contact piece contacts the lamp pin and is displaced to a position corresponding to the contact piece in the lamp socket. A straight tube fluorescent lamp apparatus, characterized in that a fixing piece that comes into contact with the contact piece is provided, and an opening/closing part made up of the pair of contact pieces and the fixing piece is arranged in a filament circuit of the straight tube fluorescent discharge tube. .