JP3470652B2 - External electrode type discharge lamp - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an external electrode type discharge lamp.

[0002]

2. Description of the Related Art At present, various light source lamps are used in a light source such as a document illuminating device in an image information device such as a facsimile, a copying machine, an image reader, or a backlight in a liquid crystal display device.
As one of them, an external electrode type discharge lamp is known.

FIG. 8 is an explanatory sectional view showing an example of a straight tubular external electrode type discharge lamp configured as a fluorescent lamp. In this external electrode type discharge lamp, for example, a fluorescent substance 11 is formed on the inner surface of a rod-shaped glass tube 2 whose both ends are hermetically sealed.
And the fluorescent substance 11 is not applied, the light emitting aperture portion 10 extending in the longitudinal direction is formed, and a predetermined amount of rare gas is enclosed in the glass tube 2. On the outer surface of the glass tube 2, a pair of strip-shaped or linear electrodes 3 extending in the length direction of the glass tube 2 are arranged so as to face each other in the diametrical direction. Reference numeral 12 is a coating tube made of an insulating resin that covers the outer peripheral surface of the glass tube 2 including the pair of electrodes 3 and 3.

In the discharge lamp having such a structure,
When a continuous high frequency voltage or a pulsed high frequency voltage is supplied to the pair of electrodes 3 and 3, a discharge phenomenon occurs in the inner space of the glass tube 2 to cause the fluorescent substance 11 to emit light, and this light emits the light emitting aperture portion. Radiated from 10.

In such an external electrode type discharge lamp 1, since it is not necessary to provide a discharge electrode inside the glass tube 2,
It is not necessary to seal the power supply conductor to the glass tube 2, and furthermore, the lead wires for supplying a high frequency voltage to the pair of electrodes 3, 3 are connected at the same end side of the glass tube 2. This makes it possible to easily arrange the power supply system in the light irradiation device in which the external electrode type discharge lamp 1 is mounted. Therefore, it is advantageous in that the structure of the light irradiation device is simple.

In the external electrode type discharge lamp 1 having the above-mentioned structure, power supply terminals are connected to the ends of the external electrodes 3 and 3 of the glass tube 2 in order to electrically connect the lead wires to the electrodes. Then, the lead wire is attached to the power supply terminal by soldering, or the lead wire is connected to a part of the power supply terminal by crimping integrally with a splice band which is a metal band and connecting. There is a method, and this power supply terminal is connected to the lamp.

FIG. 4 shows an example of the power supply terminal 20 used in such a case. The power supply terminal 20 has a connecting plate portion 21 connected to an electrode and a connecting plate portion 21 via a projecting portion 23. A lead wire connected portion 22 to which a lead wire is attached and which is continuous with the portion 21 is formed.

However, in such a power supply terminal 20,
In the work of connecting the lead wires, or after connecting the lead wires, the load applied by the deflection of the lead wires easily breaks near the boundary K1 between the lead wire connected portion 22 and the protruding portion 23. was there.

[0009]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a power supply terminal structure that is less likely to be broken even when a load is applied to the power supply terminal during the work of connecting the lead wires or after connecting the lead wires. The object is to provide an external electrode type discharge lamp having a firm power supply connection.

[0010]

In order to solve the above-mentioned problems, the present invention provides a lamp body in which an electrode extending in the tube axis direction is provided on the outer surface of a glass tube, and the electrode of the lamp body. An external electrode type discharge lamp comprising a power supply terminal made of a metal plate connected to an end of the electrode, the power supply terminal being connected to a connecting plate portion connected to an end of the electrode and a lead wire. And a connecting plate portion connected between the connecting plate portion and the connecting plate portion.
The external electrode discharge lamp is characterized in that it has a neck portion that is narrower than the connecting plate portion , and that the neck portion has a shape that is substantially symmetrical with respect to the longitudinal centerline of the power supply terminal. It is a thing.

Further, it is preferable that an opening is provided in the connecting plate portion of the power supply terminal so as to leave a peripheral edge of the connecting plate.

[0012]

The feeding terminal has a connecting plate portion connected to the end of the electrode and a connecting plate portion connected to the lead wire.
Between the connection plate portion and the connection plate portion, the connection plate portion and the
Since the neck portion has a narrower width than the connecting plate portion and the neck portion is substantially symmetrical with respect to the center line in the longitudinal direction of the power feeding terminal, it is necessary to connect the lead wire to the connecting plate portion. Even if a load is applied to the lead wire connection portion in a direction perpendicular to the surface of the terminal, the load is relaxed by the neck portion and the power supply terminal is not broken. Further , when the connecting plate portion of the power feeding terminal is provided with an opening so as to leave the peripheral edge of the connecting plate, the lead wire can be easily tightened and fixed at the peripheral edge of the connecting plate, and the power feeding terminal is not broken.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory sectional view showing an example of the configuration of an external electrode type discharge lamp 1 of the present invention. In this external electrode type discharge lamp 1, for example, electrodes 3, 3 are arranged on the outer surface of a glass tube 2 so as to be diametrically opposed to each other and extend in the tube axis direction of the glass tube 2, respectively. At the end located on the same side of 3, the power supply terminal 4
It is configured by connecting 0s.

The electrodes 3, 3 are formed, for example, by attaching a metal foil such as aluminum to the outer surface of the glass tube 2 so as to extend in the tube axis direction, or by applying a conductive paste. Reference numeral 5 is a heat-shrinkable tube attached to the outer surface of the glass tube 2 so as to cover the power supply terminal 40 from the outer surface thereof, and 6 is a lead wire connected to the power supply terminal 40. FIG. 2 is an explanatory view of the power supply terminal 40 used in the external electrode type discharge lamp of the present invention as seen from the front.

This power supply terminal 40 is formed by deforming a metal plate, and is a long and narrow strip-shaped connecting plate portion 4.
1 and a rectangular connecting plate portion 4 following the connecting plate portion 41 via a neck portion 43 having a narrow flat plate shape and substantially symmetrical with respect to the longitudinal centerline of the power supply terminal.
2 and the end portion of the connecting plate portion 42 is used as the lead wire connected portion 45. Phosphor bronze is preferable as the metal plate material of the power supply terminal 40 because it has great elasticity at high temperatures, but the material is not limited to this, and examples thereof include copper, nickel, stainless steel, and an alloy of copper, zinc, and nickel. Etc. may be used.

The connecting plate portion 41 is a portion which is arranged and connected so as to overlap with the end portions of the electrodes 3 and 3 arranged on the outer surface of the glass tube 2 of the lamp body. It is sufficient that the area to be connected to 3 can be secured and a reliable connection can be achieved. In addition, it is preferable that the electrodes 3 and 3 arranged in the glass tube 2 are curved so as to fit the curved surfaces.

FIGS. 5 and 6 are views showing a state in which a lead wire is attached to the power supply terminal according to the present invention. Glass tubes and electrodes to which power supply terminals are attached are omitted from the figure. FIG. 5A shows a type in which the connecting plate portion 42 has no opening, and the lead wire 6 is joined to the power supply terminal 40 at the solder joint portion 7 by soldering. Neck 43
Is narrower than the connecting plate portion 41 and the connecting plate portion 42, and has a shape that is substantially symmetrical with respect to the longitudinal centerline of the power supply terminal. FIG. 6 is a type having an opening 44 in the connecting plate portion 42. The peripheral edge of the connecting plate is left, and the lead wire 6 is crimped and connected by the splice band at the winding portion 8. The neck portion 43 is wider than the connecting plate portion 41 and the connecting plate portion 42.
Is narrow and has a substantially symmetrical shape with respect to the longitudinal centerline of the power supply terminal.

FIG. 5B is a side view showing a state in which the lead wire 6 is connected to the power supply terminal 40 according to the present invention and a load is applied in a direction perpendicular to the terminal surface. In this case, since the connection plate portion 41 of the power supply terminal 40 is joined to the electrode 3, the connection plate portion 41 is curved along the outer peripheral surface of the glass tube 2. However, the connecting plate portion 42 does not bend due to the neck portion 43 having a substantially symmetrical shape with respect to the center line in the longitudinal direction of the power feeding terminal, and is free to bend even if a load is applied in the twisting direction of the terminal 40. It is able to move in the direction of its load and, due to the neck 43, the twisting force is relieved. Therefore, the load applied to the lead wire connected portion 45 is weakened, so that the power supply terminal 40 is not broken.

On the other hand, FIG. 7 (a) shows a conventional power supply terminal, in which the lead wire 6 is connected to the lead wire connected portion 22 by crimping at the tightening portion 8 with a splice band. Figure 7
(B) is a side view showing a state in which the lead wire 6 is connected to the conventional power supply terminal 20 and a load is applied in a direction perpendicular to the terminal surface. The glass tube 2 and the electrode 3 to which the power feeding terminal 20 is attached are omitted from the drawing. In this case, the entire terminal of the power supply terminal 20 is curved along the outer circumference of the glass tube 2, and when a load is applied in the direction in which the terminal is twisted, the projecting portion 23 can freely move in the direction of that load. Instead, the twisting force concentrates on the lead wire connected portion 22 and breaks near the boundary of the lead wire connected portion 22 protruding portion 23.

[0020]

According to the present invention, the power supply terminal has the connecting plate portion connected to the end of the electrode and the connecting plate portion connected to the lead wire. Between the connecting plate part and the connecting plate part, the connecting plate part has a narrower width than the connecting plate part and has a neck part in the terminal width direction which is substantially symmetrical with respect to the longitudinal center line of the power supply terminal. Even if a load is applied to the surface of the terminal at the lead wire connection portion when connecting the lead wire to the power supply terminal, the power supply terminal is unlikely to break, and an external electrode type discharge lamp having a firm power supply connection can be provided. .

Further, when the connecting plate portion of the power feeding terminal is provided with an opening so as to leave the peripheral edge of the connecting plate, the lead wire can be easily tightened and fixed at the peripheral edge of the connecting plate, and the power feeding terminal is broken. do not do.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the configuration of an external electrode type discharge lamp of the present invention.

FIG. 2 is a front view of a power supply terminal according to the present invention.

FIG. 3 is a front view of another example of the power supply terminal according to the present invention.

FIG. 4 is a front view of a conventional power supply terminal.

FIG. 5 is a diagram showing a state in which a lead wire is attached to a power supply terminal according to the present invention.

FIG. 6 is a diagram in which a lead wire is attached to a power supply terminal according to the present invention.

FIG. 7 is a diagram in which a lead wire is attached to a conventional power supply terminal.

FIG. 8 is a sectional view showing an example of the configuration of an external electrode type discharge lamp of the present invention.

[Explanation of symbols]

1 External electrode type discharge lamp 2 glass tubes 3 electrodes 5 heat shrink tube 6 lead wire 7 Solder joint 8 winding section 10 aperture part 11 fluorescent substances 12 coating tubes 20 power supply terminals 21 Connection plate part 22 Lead wire connected part 23 protruding part 40 power supply terminal 41 Connection plate part 42 Connection plate part 43 neck 44 openings 45 Lead wire connected part

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Claims (2)

(57) [Claims] 1. A lamp main body in which an electrode extending in the tube axis direction is arranged on the outer surface of a glass tube, and a power supply terminal made of a metal plate connected to an end portion of the electrode of the lamp main body. In the external electrode type discharge lamp comprising, the power supply terminal has a connection plate portion connected to an end of the electrode and a connection plate portion connected to a lead wire,
Between the connection plate portion and the connection plate portion , the connection plate portion and the
An external electrode type discharge lamp having a neck portion having a width narrower than that of the connecting plate portion , and the neck portion having a shape that is substantially symmetrical with respect to a longitudinal centerline of the power supply terminal. 2. The external electrode type discharge lamp according to claim 1, wherein an opening is provided in the connecting plate portion of the power supply terminal so as to leave a peripheral edge of the connecting plate.