JP3137895B2 - Flat fluorescent lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat fluorescent lamp having improved discharge characteristics at start-up.

[0002]

2. Description of the Related Art The structure of a conventional flat fluorescent lamp will be described with reference to FIGS. Here, FIG. 4 is an exploded perspective view of the conventional flat fluorescent lamp, FIG. 5 is a plan view of the conventional flat fluorescent lamp, and FIG. 6 is an enlarged sectional view of a main part of the conventional flat fluorescent lamp housed in a shield case. FIG.

A flat fluorescent lamp has an upper glass substrate 1 and a lower glass substrate 2, and phosphors 3 and 4 are applied to opposing surfaces of the upper glass substrate 1 and the lower glass substrate 2. Is formed in a dish shape having a peripheral edge as a frame portion, and a cutout 6 for inserting an exhaust pipe 5 is formed in a frame portion on one side, and the upper glass substrate 1 and the lower glass substrate 2 are formed.
And a pair of electrodes 7 and 8 are arranged opposite to each other in a space formed between them and lead pieces 7a, 7b, 8a and 8 are provided at both ends of each electrode.
b is attached.

Then, recesses 9 are formed on the upper surface of the frame portion of the lower glass substrate 2, and the lead pieces 7a, 7
b, 8a, 8b are placed and fixed by the frit 10. Here, in the related art, as shown in FIG. 5, all the lead pieces are inserted through the notches 12 of the shield case 11 so that the power supply can be connected to either one side or the other side. It protrudes outward.

[0005] The shield case 11 is used for facilitating initial discharge at the start of lighting, and for suppressing uneven brightness at the time of lighting. 13 is H
g (mercury) dispenser.

[0006]

As described above, in the prior art, the lead pieces 7a, 7b, 8a and 8b protrude from either one side or the other side. The pieces 7b and 8b are not used. On the other hand, since the inner surface of the shield case 11 is adhered with the aluminum foil 14 or the like, the shield case 11 serves as a close conductor to the lead pieces 7b and 8b that are not used for energization, so that the discharge is easily performed. Further, the shield case 11 itself may be made of metal.

However, when assembling the flat fluorescent lamp and the shield case 11, it is extremely difficult to keep a small distance between the lead piece and the shield case constant since an assembly error is inevitably generated. For this reason, the flat fluorescent lamp has a problem that the discharge is not stabilized at the time of starting the discharge, causing unevenness in brightness and the like.

[0008]

In order to solve the above-mentioned problems, a flat fluorescent lamp according to the present invention comprises a flat upper glass substrate coated with a phosphor, and a dish-shaped lower glass substrate coated with a phosphor. A shield case accommodating the lower glass substrate, and a pair of electrodes arranged to face each other in a space formed between the upper glass substrate and the lower glass substrate; , Lead pieces are attached to both ends, one side of the lead piece is projected outward through a notch formed in the shield case, and the other side of the lead piece is joined to the upper glass substrate and the lower glass substrate. A lead piece located inside the edge and on the other side
Between the shield tip and the shield case side wall
The distance was set close to the interval at which current flowed .

With the above structure, the lead piece on the other side does not contact the shield case, so that it is not necessary to cut out the side surface of the shield case facing the lead piece. Further, since the bonding in advance other side of the lead piece at the top surface glass substrate and the lower surface of glass substrate, the other side
It is easy to keep the distance from the tip of the lead piece to the joining edge constant. Also, from the joint edge,
The distance to the tip of the lead piece is 0.1 to 1.0 mm.
Preferably .

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of a flat fluorescent lamp according to the present invention, FIG. 2 is a perspective view showing a state in which the flat fluorescent lamp is housed in a shield case, and FIG. 3 is a housing of the flat fluorescent lamp in a shield case. It is a principal part expanded sectional view of a state, the same code | symbol is attached | subjected to the same part as the conventional, and the description is abbreviate | omitted.

In the present invention, of the lead pieces attached to both ends of the electrodes 7 and 8, only the lead pieces 7a and 8a used for energization protrude from one side of the shield case 11, and the other. Are located inside the shield case 11.

The upper glass substrate 1 and the lower glass substrate 2 are hermetically sealed at the edges by a sealing material such as a glass frit 10 or the like. At the same time, the lead pieces 7a, 7b, 8
a, 8b are also fixed in the concave portions 9 formed in the frame portion of the lower glass substrate 2.

At this time, the other lead pieces 7b and 8b which are not used for energization are arranged inside the joining edge between the upper glass substrate 1 and the lower glass substrate 2. At this time, the distance s from the joining edge to the tips of the lead pieces 7b and 8b is set to 0.
It is preferable to set it to 1 to 1 mm.

According to the above embodiment, the shield case 1
No. 1 can fit a fluorescent lamp without providing a cutout at a portion corresponding to the lead pieces 7b and 8b not used for the energization. At the time of this fitting, the lead pieces 7b,
It is easy to reduce the gap between the tip of 8b and the shield case 11.

Since the glass frit 10 is made of a non-conductive material, the distal ends of the lead pieces 7b and 8b and the shield case 11 are electrically insulated.

In the above, when a voltage is applied between the electrodes 7 and 8 , a closed circuit of the lead pieces 7a and 7b → the shield case 11 → the lead pieces 8a and 8b is formed. When a closed circuit is formed, a current flows through the electrodes 7 and 8, and the electrodes 7, 8
8 is heated and discharge occurs in the discharge space.

Therefore, mercury is excited and emits ultraviolet rays. The ultraviolet rays irradiate the phosphors 3 and 4 on the inner surfaces of the upper glass substrate 1 and the lower glass substrate 2, and as a result, the phosphors 3 and
4 emits light with uniform luminance over the entire surface.

At this time, since the gap between the tips of the lead pieces 7b, 8b and the shield case 11 is small, the discharge stability is enhanced, and the lamp is lit at a discharge voltage about 10 volts lower than that of the conventional fluorescent lamp. Can be.

[0019]

As described above, according to the flat fluorescent lamp of the present invention, the lead piece on the other side is shielded.
There is no risk of contact with the lead
There is no need to cut out the side of the shield case.
In addition, the lead piece on the other side should be
Since it is joined with the glass substrate, the tip of the lead piece on the other side
It is easy to keep the distance from the end to the joining edge constant
There is . Furthermore, since the gap between the tip of the lead piece on the other side and the shield case can be reduced, the lamp can be lit at a discharge voltage about 10 volts lower than that of a fluorescent lamp having a conventional structure. , Discharge stability can be improved, and uneven brightness and the like can be suppressed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a flat fluorescent lamp according to the present invention.

FIG. 2 is a perspective view showing a state where the flat fluorescent lamp is housed in a shield case.

FIG. 3 is an enlarged sectional view of a main part in a state where the flat fluorescent lamp is housed in a shield case.

FIG. 4 is an exploded perspective view of a conventional flat fluorescent lamp.

FIG. 5 is a plan view of a conventional flat fluorescent lamp.

FIG. 6 is an enlarged sectional view of a main part in a state where a conventional flat fluorescent lamp is housed in a shield case.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Upper surface glass substrate, 2 ... Lower surface glass substrate, 3, 4 ... Phosphor, 7, 8 ... Electrode, 7a, 8a ... Lead piece on one side, 7b, 8b ... Lead piece on the other side.

Continuation of the front page (72) Inventor Mitsaya Ozaki 3-5-1, Doshomachi, Chuo-ku, Osaka-shi, Osaka Inside Nippon Sheet Glass Co., Ltd. (56) References JP-A-6-208844 (JP, A) JP-A-3 −88259 (JP, A) Japanese Utility Model Showa 64-21953 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 61/30

Claims (2)

(57) [Claims] 1. A flat upper glass substrate coated with a phosphor, a dish-shaped lower glass substrate coated with a phosphor, a shield case accommodating the lower glass substrate, the upper glass substrate and the lower glass substrate And a pair of electrodes disposed opposite to each other in a space formed therebetween, wherein a lead piece is attached to each of both ends of the pair of electrodes, and a lead piece on one side is a shield case. And the lead piece on the other side is located inside the joining edge between the upper glass substrate and the lower glass substrate.
And the tip of the other side of the lead piece and the
The side wall of the shield case is when current flows between them.
A flat fluorescent lamp characterized by being close to a distance . 2. The flat fluorescent lamp according to claim 1,
The tip of the lead piece on the other side from the joint edge
Characterized in that the distance to is 0.1 to 1.0 mm
Flat fluorescent lamp .