JPH0389446A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To obtain a fluorescent lamp easily whose airtight container main body and electrode bars are sealed by low-melting point glass and having excellent airtightness by inserting and sealing the glass wound sections of an electrode bar into the large-diameter section of a hole, and adjusting the inclination of the insertion length of the bar with the small-diameter section. CONSTITUTION:A small-diameter section and a large-diameter section are formed in a hole 15 for sealing electrode bars provided on an airtight container main body 1. Glass wound sections 16 of electrode bars 17a-18c are brought into contact with the bottom face of the large-diameter section of the hole 15, the insertion length into discharge spaces of electrode bars is restricted, and their tips are prevented from touching a front plate 2. No sealing is preformed at the small-diameter section, the diameter is reduced, and the inclination of electrode bars can be suppressed. The diameter of the large-diameter section which is a sealing section is increased, the filling of low-melting point glass is facilitated, and the leak defect due to insufficient filling is prevented. The glass wound section 16 has good wettability to low-melting point glass, thus airtightness is improved, and the extremely slow leak can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fluorescent lamp used as a light emitting element of a large color image display device.

2. Description of the Related Art The applicant has previously proposed a novel fluorescent lamp as shown in FIGS. 3 and 4 as a light emitting element used in large color image display devices and the like. FIG. 3 is an exploded perspective view of this fluorescent lamp, and FIG. 4 is a front view thereof, showing a rectangular parallelepiped airtight container body 19 made of a ceramic container, and a front surface made of a glass plate sealed with low-melting glass on the front surface. face plate 20,
The airtight container is composed of an electrode filament storage section 22 made of a glass tube whose one end is sealed with low melting point glass and whose other end is sealed in a hole 21 made in the rear surface of the airtight container body 19. . Inside the airtight container body 19, there is a partition wall 2.
3 are provided in a lattice-like integral bottom shape, and there are six discharge spaces 24a.

24b, 24c, 25a, 25b, and 25c are formed. As shown in FIG. 4, communication holes 26 are provided at the center of the bottom of the airtight container body 19, that is, at one end of each discharge space, to connect these discharge spaces and the space of the electrode filament storage section 22. A coiled electrode filament 27 provided in the electrode filament housing 22 is supported by two internal lead-in wires 28 and disposed near this. The two internal lead-in wires 28 are supported by a stem 29, and external lead-in wires 30 are connected to these, respectively. Note that 31 indicates an exhaust pipe. Further, electrode rods 32a, 32b, 32c, and 33a are provided at the end farthest from each communication hole 26, that is, at the other end of these discharge spaces.
, 33b, 33c are provided, and a plurality of discharge paths are formed between each electrode rod and the electrode filament 27. Mercury and rare gas are sealed inside the airtight container.

A rare earth phosphor that emits green light is placed on the ceramic wall surface forming each discharge path of the airtight container body 19, that is, the discharge spaces 24a and 25a.
A rare earth phosphor that emits red light is applied to the ceramic wall surface forming the space b, and a rare earth phosphor that emits blue light is applied to the ceramic wall surface forming the discharge spaces 24c and 25c.

As described above, the discharge spaces 24a and 24b are formed.

24c represents one picture element, and discharge space 25a represents one picture element.

25b and 25c each form another picture element.

Electrode filament (cathode) 27 of such a fluorescent lamp
A current is passed through each electrode rod (anode) 32a.

At the same time, a voltage necessary for starting discharge is selected and applied to 32b, 32c, 33a, 33b, and 33c.

The chromaticity can be changed by changing the current flowing through each discharge path, and therefore, color image display is possible by arranging a large number of such fluorescent lamps.

Problems to be Solved by the Invention The inventor has considered mass production of fluorescent lamps having such a configuration. The inventors have also discovered that in a fluorescent lamp having such a structure, there is a problem that needs to be improved in the sealing structure between the rear surface of the airtight container body and the electrode rod (anode).

FIG. 5 shows a cross-sectional view of the fluorescent lamp shown in FIGS. 3 and 4, cut at electrode rods 33a, 33b, and 33c. Electrode rods 33 a e 33 b.

33c are each inserted and sealed into a hole 35 for electrode rod sealing made in the rear end of the airtight container body 19 by a low melting point glass 34, respectively. In such a structure, the tip of each electrode rod is sealed by contacting the front plate 20 made of a glass plate, so the front plate 20 is subjected to stress due to the difference in expansion coefficient between the electrode rod and the airtight container body 19. This may result in damage. In addition, if the gap between this hole and the electrode rod is small, the low melting point glass will not be filled sufficiently, resulting in leakage defects, and if it is large, the electrode rod will be tilted and sealed. there were. Furthermore, it is difficult to perfectly match the expansion coefficients of the electrode rod and the airtight container body, and low melting point glass generally does not adhere well to metal, so slow leakage occurs at the sealed part of the electrode rod. was there.

The present invention has been made to solve these problems, and provides a fluorescent lamp with excellent airtightness and easy sealing between the airtight container body and the electrode rod using low-melting glass.

Means for Solving the Problems In order to solve this problem, the fluorescent lamp of the present invention has a translucent front plate sealed with low-melting glass on the front side of the rectangular parallelepiped airtight container body, and a central part of the rear side. A hole is provided in the electrode filament housing and the open end of the electrode filament housing is sealed with low melting point glass to form an airtight container, and a plurality of discharge spaces are formed by providing a lattice-shaped partition wall in the airtight container body. A communication hole connecting each discharge space and the space of the electrode filament housing is provided independently at a position opposite to the hole in the center of the bottom of the airtight container body, and is far from the communication hole of each discharge space. A stepped hole having a large diameter part on the outside and a small diameter part on the inside is provided at the rear end of the airtight container body opposite to the other end, and an electrode rod having a glass-wrapped part is placed in this hole. The electrode rods are inserted so that their tips are exposed in the discharge space, and the glass-wound part and the large diameter part of the hole are sealed with low-melting glass, so that the electrode filament and each electrode rod are inserted into the discharge space. A plurality of discharge paths are formed between the airtight container body and the exposed portion, and a phosphor is applied to each portion of the airtight container body to form picture elements.

Function: In the fluorescent lamp of the present invention, the hole for sealing the electrode rod formed in the airtight container body has a small diameter portion and a large diameter portion, and the electrode rod is provided with a glass-wrapped portion, so that the end of the glass-wrapped portion The insertion length of the electrode rod into the discharge space can be regulated by contacting the bottom surface of the large diameter portion of the hole, thereby preventing the electrode rod from contacting the front plate and damaging the front plate. In addition, since the diameter of the large-diameter part that serves as the sealing part can be made sufficiently larger than the diameter of the glass-wound part, it is easy to fill with low-melting glass, and the coating of the low-melting glass on the glass is good. Therefore, airtightness is greatly improved. Further, since it is not necessary to seal the small diameter portion of the hole, the diameter thereof may be small enough to allow the electrode rod to be inserted therein, and therefore, the inclination of the electrode rod can be suppressed at this small diameter portion.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a fluorescent lamp which is an embodiment of the present invention;
FIG. 2 is a sectional view taken along the line II--II in FIG. 1.

As shown in FIGS. 1 and 2, in the fluorescent lamp according to the embodiment of the present invention, a front plate 2 made of a glass plate is sealed with a low melting point glass 3 on the front surface of a rectangular parallelepiped airtight container body l made of a ceramic container. Furthermore, a bottomed hole 4 is provided on the rear surface of the airtight container body 1, into which the open end of an electrode filament storage section 5 made of a glass tube is inserted and sealed with a bottom melting point glass 3. An airtight container is constructed.

Inside the airtight container body 1, partition walls 6 are integrally formed in a lattice shape, and six discharge spaces 7a, 7b are provided.
, 7 c T 8 a * 8 b r 8 c are formed. At the center of the bottom of the airtight container body 1, that is, at one end of each discharge space, a communication hole 9 connecting these discharge spaces and the space of the electrode filament storage section 5 is provided. A coiled electrode filament 10 provided in the electrode filament storage section 5 is supported by two internal lead-in wires 11 and arranged. The two internal lead-in wires 11 are supported by a stem 12, and external lead-in wires 13 are connected to these, respectively. In addition, 14
indicates an exhaust pipe. Further, the end far from the communication hole 9, that is, the rear end of the airtight container body 1 facing the other end of these discharge spaces, each has a large diameter part on the outside and a small diameter part on the inside. Hole 1 for sealing the electrode rod with a step
5 is formed. Then, insert the glass winding part 1 into this hole.
Electrode rods 17a, 17b, 17c, 18a, 1 provided with 6
8b.

18c is inserted so that the tip of each electrode rod is exposed to the discharge space, and the glass winding portion 16 and the large diameter portion of the hole 15 are sealed with the low melting point glass 3, respectively. and,
A plurality of discharge paths are formed between these electrode rods and the electrode filament 10. Mercury and rare gas are sealed inside the airtight container.

A rare earth phosphor that emits green light is applied to the ceramic walls forming the discharge paths of the airtight container body 1, that is, the discharge spaces 7a and 8a, and the ceramic walls forming the discharge spaces 7b and 8b are coated with a rare earth phosphor. A phosphor that emits red light is applied to the discharge spaces 7c and 9c, and a phosphor that emits blue light is applied to the discharge spaces 7c and 9c.
forms one picture element, and discharge spaces 8a, 8b, and 8c form another picture element. In the fluorescent lamp having such a configuration, the hole 15 for sealing the electrode rod formed in the airtight container body 1 is provided with a large diameter portion and a small diameter portion, and each electrode rod is provided with a glass wrapped portion 16. Because there are
By bringing one end of this glass winding into contact with the bottom surface of the large diameter part of the electrode rod sealing hole 15, the insertion length of each electrode rod into each discharge space can be regulated, and thus the electrode rods 17a, 17b
.

The tips of 17c, 18a, 18b, and 18c can be prevented from coming into contact with the front plate 2, and damage to the front plate 2 can be prevented. In addition, since sealing is not performed in the small diameter portion, the diameter of this portion can be made small and the inclination of the electrode rod can be suppressed.
On the other hand, since the diameter of the large diameter part, which is the sealing part, can be made large,
A sufficiently large gap with the glass winding portion can be provided to facilitate filling of the low melting point glass, thereby preventing leakage defects due to insufficient filling of the low melting point glass. Furthermore, 17a
, 17b, 17c, 18a, 18b, and 18c are made of low-melting point glass and have good twisting, so the airtightness is greatly improved and the super slow speed that occurs when no glass windings are provided. It also prevents leaks.

In the above embodiment, a metal rod made of one material is used as the electrode rod, but the invention is not limited to this. The electrode rod may be made by connecting metal rods whose parts are made of different materials, and it is only necessary that the sealed portion of the electrode rod be provided with a glass-wrapped portion.

Further, in the above embodiment, a case was explained in which the airtight container main body was partitioned into six discharge spaces as a light emitting element of a large color image display device, but it goes without saying that the present invention can be implemented regardless of the number of discharge spaces. be.

As described in detail, the present invention provides a large diameter part and a small diameter part in the hole for sealing the electrode rod formed in the airtight container body, and at the same time, the electrode rod is provided with a glass-wrapped part, and this glass-wrapped part is made larger. Since the electrode rod is inserted and sealed in the diameter part, the inclination of the electrode rod can be suppressed in the small diameter part, and the insertion length of the electrode rod can also be controlled, preventing damage to the front plate. The material is easy to fill and has good adhesion to the glass-wrapped portion, making it possible to provide a fluorescent lamp with excellent airtightness.

[Brief explanation of drawings]

FIG. 1 is a front view of a fluorescent lamp which is an embodiment of the present invention;
Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Fig. 3 is an exploded perspective view for explaining the fluorescent lamp previously filed by the applicant, and Fig. 4 is a front view of the same. FIG. 5 is a sectional view of the main part. 1... Airtight container body, 2... Front plate,
3...Low melting point glass, 4...Hole, 5...
. . . Electrode filament storage section, 6 . . . Partition wall, 7 a * 7 b * 7 co 8 a. 8b, 8c...Discharge space, 9...Communication hole, 10...Electrode filament, 15...
... Hole for electrode rod sealing, 16 ... Glass winding portion, 17a, 17b. 17c, 18a, 18b, 18c... electrode rods.

Claims (1)

[Claims] A translucent front plate is sealed with low-melting point glass to the front of the rectangular parallelepiped airtight container body, and a hole is made in the center of the back surface and the open end of the electrode filament storage area is sealed with low-melting point glass. a plurality of discharge spaces are formed by providing a lattice-like partition wall in the airtight container main body, and each discharge space is located at a position opposite to the hole at the center of the bottom surface of the airtight container main body. A communication hole connecting the electrode filament housing and the space of the electrode filament storage section is independently provided, and a large diameter portion is provided externally at the rear end of the airtight container body facing the end of each discharge space far from the communication hole. A stepped hole each having a small diameter portion inside is provided, and an electrode rod provided with a glass-wrapped portion is inserted into this hole so that the tip of the electrode rod is exposed to the discharge space, and The large diameter portion of the hole is sealed with low melting point glass to form a plurality of discharge paths between the electrode filament and the exposed portion of each electrode rod to the discharge space, and each of the airtight container body A fluorescent lamp characterized by having picture elements formed by applying a fluorescent material to the portion that becomes the discharge path.