JP2558582B2 - Method of manufacturing 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 method of manufacturing a fluorescent lamp, and more particularly to a method of manufacturing a flat type fluorescent lamp for use as a backlight of a liquid crystal display. .

[0002]

2. Description of the Related Art FIG. 10 shows an example of a conventional method of manufacturing a flat fluorescent lamp 90 of this type, in which two glass substrates 91 on which a phosphor film 92 is formed are used as the fluorescent material. The body film 92 is welded to a substantially square frame glass 93 so that the inside thereof is inside, and at this time, the frame glass 93 is provided with an electrode 94 and an exhaust pipe 95,
After welding with the glass substrate 91, exhaustion and injection of a rare gas are performed and sealing is performed to complete the fluorescent lamp 90.

[0003]

However, when the fluorescent lamp 90 is used as a backlight of a liquid crystal display for a viewfinder of a video camera or a screen of a portable television receiver, for example, the diagonal length is at most 25 mm. This is only about 50 mm, and when such small fluorescent lamps 90 are individually sealed and exhausted, there arises a problem that productivity is lowered and cost is increased, and a solution to this point is a problem. It was supposed to be.

[0004]

The present invention is, as a concrete means for solving the above-mentioned conventional problems, an electrode film, a dielectric film, and an electrode film at a plurality of positions on a mother glass substrate having a predetermined arrangement. Each of the phosphor films is formed by a suitable film forming means and laminated to form a laminated film body, and a sealing frit having a substantially square shape is formed on one mother glass substrate so as to surround the laminated film body. A glass pattern is provided by a thick build-up means, and the two mother glass substrates are opposed to each other with a gap such that the laminated film body faces each other and the frit glass pattern for sealing does not contact the other mother glass substrate. After setting in the exhaust device, exhausting and introducing rare gas in this state, the two mother glass substrates are brought into contact with each other with the frit glass pattern for sealing to heat and pressurize and then before Taken out from the exhaust system is to solve the problems by providing a manufacturing method of a flat fluorescent lamp, characterized in that the splitting into individual fluorescent lamp is subjected to scribing and breaking process. The uniform spacing between the two glass substrates can be solved by preliminarily mixing spacers such as glass beads in the frit glass and spraying the spacers on the laminated film.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail based on an embodiment shown in the drawings. 1 to 9 show a method of manufacturing a flat fluorescent lamp 1 according to the present invention in the order of steps. First, as a first step, a flat fluorescent lamp having a desired size as shown in FIGS. 1 and 2. An electrode film 3a is formed of a transparent conductive film such as an ITO film at a predetermined position (3 columns × 3 rows in the illustrated example) on a mother glass substrate 2 having an area capable of taking a plurality of lamps 1. Subsequently, the dielectric film 3b and the phosphor film 3c are laminated in this order to form the laminated film body 3 as shown in FIG.

At this time, each film, that is, the electrode film 3
When forming a, the dielectric film 3b, and the phosphor film 3c, for example, a vapor deposition method, a printing method, or any other method suitable for forming each film may be used. Will be performed in common.

Then, a half of the mother glass substrate 2 which has been subjected to the above steps is surrounded by a frit glass pattern 4 for sealing which has a substantially square V shape as shown in FIG. However, since the frit glass pattern 4 for sealing is supposed to hold an appropriate gap between the two mother glass substrates 2 in the sealing step described later, a considerable thickness is required. And therefore,
It is provided by an extrusion means using a tool, which is commonly called a dispenser or the like that enables thick buildup.

Since the mother glass substrates 2 are formed as described above, half of the mother glass substrates 2 have the frit glass pattern 4 for sealing and the other half have no frit glass pattern 4 for sealing. . In the present invention, in the subsequent step, the exhaust device 1 such as a bell jar type is formed by pairing the mother glass substrate 2 with and without the frit glass pattern 4 for sealing.
Set to 0.

When performing the above-mentioned setting, as shown in FIG. 5, the laminated film body 3 of the mother glass substrate 2 with the frit glass pattern 4 for sealing and the laminated film body 3 of the mother glass substrate 2 without it are separated. The frit glass patterns 4 for sealing are made to face each other and face each other as a gap that does not contact the other mother glass substrate 2.

After the above setting is performed, the exhaust device 10
The interior is evacuated and then the rare gas is injected. In this state, the two mother glass substrates 2 are brought close to each other as shown in FIG. 6, and the sealing frit glass pattern 4 is contacted and applied. Pressure and heating are performed and sealing is performed. Therefore, a plurality of flat fluorescent lamps 1 are connected to each other on the mother glass substrate 2, and after being taken out from the exhaust device 10, scribing is performed as shown in FIG. For example, the flat fluorescent lamp 1 shown in FIG. 8 can be obtained.

Therefore, according to the manufacturing method of the present invention, it is not necessary to perform exhaust by the exhaust pipe, injection of a rare gas, and sealing of the exhaust pipe after finishing each of them, for each flat fluorescent lamp 1. Man-hours are reduced, production efficiency is dramatically improved, and desired effects such as cost reduction are obtained.

Further, FIG. 9 shows another embodiment of the present invention, in which mercury vapor is difficult to be enclosed only by the manufacturing method of the present invention as compared with the conventional sealing step which is individually performed by the exhaust pipe. It is expected to become a thing. This example was carried out to improve this point, and an amalgam-like mercury film was formed on the entire surface or a part of the laminated film body 3 of one of the mother glass substrates 2 except the phosphor layer. 5 is formed in advance by, for example, a printing unit. Then, it can be converted into mercury by heating after the flat fluorescent lamp is completed. By doing so, it is possible to omit the step of filling the mercury vapor from the step in the exhaust device 10 and solve the problem.

[0013]

As described above, according to the present invention, a laminated glass body corresponding to a plurality of flat fluorescent lamps and a mother glass substrate on which a frit glass pattern for sealing is formed in advance are confronted in an exhaust device and exhausted. The flat fluorescent lamp is manufactured by exhausting the inside of the device, injecting a rare gas, and sealing at the time when the conditions inside the tube are satisfied, and then dividing it separately outside. It is possible to reduce the number of man-hours by simultaneously performing a large number of exhausting and sealing steps, which is an extremely excellent effect in improving the productivity and reducing the cost of this type of flat fluorescent lamp. Is played. Further, by forming a mercury film on the laminated film body, the above effect is further enhanced.

[Brief description of drawings]

FIG. 1 is a front view showing a step of forming an electrode film in a method for manufacturing a flat fluorescent lamp according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing a step of forming a laminated film body manufactured by the same manufacturing method.

FIG. 4 is a sectional view showing a step of forming a frit glass pattern for sealing in the same manner.

FIG. 5 is a cross-sectional view showing the same exhaust process.

FIG. 6 is a cross-sectional view showing the same sealing process.

FIG. 7 is a sectional view showing a scribing process in the same manner.

FIG. 8 is a sectional view showing a completed state of the flat fluorescent lamp.

FIG. 9 is a cross-sectional view showing another embodiment of the present invention.

FIG. 10 is a perspective view showing a conventional manufacturing method.

[Explanation of symbols]

 1 ... Flat fluorescent lamp 2 ... Mother glass substrate 3 ... Laminated film body 3a ... Electrode film, 3b ... Dielectric film, 3c ... Phosphor film 4 ... Sealing frit glass pattern 5 ... Mercury film

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kasuke Kawasaki 2-17-8 Edaminami, Midori-ku, Yokohama-shi, Kanagawa (72) Inventor Yoshinori Kure 1178-2 Shinba-cho, Kohoku-ku, Yokohama-shi, Kanagawa (56) Reference Reference: Kaikaihei 2-77840 (JP, U)

Claims (3)

(57) [Claims] 1. A laminated film body is formed by depositing electrode films, dielectric films, and phosphor films on a plurality of locations on two mother glass substrates with a predetermined arrangement by suitable film forming means and laminating them. At the same time, a frit glass pattern for sealing which is substantially square-shaped so as to surround the laminated film body is provided on one mother glass substrate by a thick build-up means, and the two mother glass substrates are formed by the laminated film body. The mother frit glass pattern for sealing is set in an exhaust device so that the frit glass pattern for sealing faces the other mother glass substrate so as to face the other mother glass substrate. In this state, exhaust gas and rare gas introduction are performed, and then two mothers are placed. A glass substrate is brought into contact with the frit glass pattern for sealing and is heated and pressed to be sealed, and then taken out from the exhaust device and subjected to a scribing and braking process into individual fluorescent lamps. A method of manufacturing a flat fluorescent lamp, characterized by dividing. 2. An amalgam-like mercury film is formed on the whole surface or a part of the laminated film body on one of the mother glass substrates except the phosphor film on the mother glass substrate. A method for manufacturing the flat fluorescent lamp described. 3. The flat fluorescent lamp according to claim 1 or 2, wherein a spacer such as bead glass for controlling a gap is mixed in the frit glass pattern for sealing and scattered in the lamp. Manufacturing method.