JPH0648740Y2 - Fluorescent tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] According to the present invention, one or a plurality of pixels are arranged in a display unit.
A large display device can be configured by combining a large number of them, or can be associated with a fluorescent light emitting tube used as a light source of a non-light emitting device such as a liquid crystal by itself, and in particular, energize internal electrodes or hold internal electrodes. The present invention relates to a lead shape for

[Prior Art] Conventionally, when a large-sized image display device having a size of several meters in length and width is formed, it is extremely difficult to form the display device by one display device because of manufacturing problems. In general, one display device is constructed by combining a plurality of fluorescent light emitting tubes in which one or several tens of pixels are regularly arranged in one cell.

As this type of fluorescent light emitting tube, a cathode which emits electrons in a vacuum container, a display section in which pixels are formed by arranging a phosphor layer of a desired emission color in a predetermined pattern, and a display section This is a configuration having a control electrode group arranged between the cathode and the cathode. Then, the electrons emitted from the cathode are selectively projected onto the phosphor layer to obtain a desired light emitting display.

2 (a) and 2 (b) are views showing an example of a conventional fluorescent light emitting tube, and FIG. 2 (a) is a side sectional view thereof (FIG. 2 (b)).
FIG. 2B is a front view thereof.

In the figure, A is a fluorescent arc tube, and the arc tube body B and the arc tube body B
Of the light-shielding member 1 disposed on the display surface side and the case 2 disposed so as to cover the side surface portion and the rear portion of the arc tube body B.
have. The light shielding member 1 has an opening corresponding to a pixel 17 described later, and a series of eaves is formed above the pixel 17. When the light-shielding member 1 is used outdoors, it is possible to prevent irregular reflection on the display surface due to external light, and to prevent a decrease in contrast between a lighted portion and a non-lighted portion during display. The display quality can be improved. The light shielding member 1, the arc tube body B, and the case 2 are integrally formed by an adhesive material 3 made of silicon resin or the like.

Further, 4 is a printed circuit board, which is arranged in the case 2 so as to be behind the arc tube body B, and which leads the lead 24 from the arc tube body B to a predetermined position and is connected to the lead pin 5a of the socket portion 5. Is. The fluorescent arc tube A is attached to the power source and the drive circuit section from the socket portion 5 thereof, and constitutes a part of the display device.

Next, the arc tube body B will be described. The arc tube body B is
A glass plate or the like to a back plate 11, a front plate 12 facing the glass plate or the like and made of a translucent insulating material such as a glass plate, and a side plate 13 forming a side surface are made of a low-melting frit glass or the like. An airtight envelope is formed integrally with a sealing material, and the inside is evacuated and kept in a high vacuum state.

Further, on the inner surface of the front plate 12, a green light emitting phosphor layer 17a, a red light emitting phosphor layer 17b, and a blue light emitting phosphor layer 17c are arranged to form a pixel 17. In the arc tube body B, eight pixels 17 are regularly arranged. In addition, the phosphor layers 17a, 1
A graphite electrode 20 is formed around 7b and 17c, and a metal back layer 18 made of an Al thin film or the like is formed on the inner surface so as to cover the phosphor layers 17a, 17b and 17c. The phosphor layer 17a, 17b, 17c, the metal back layer 18, and the graphite electrode 20 form a display portion.

Reference numeral 19 is an accelerating electrode, which is a grid-like electrode having openings formed so as to correspond to the phosphor layers 17a, 17b, and 17c. The acceleration electrode 19 is disposed in contact with the inner surface of the metal back layer 18, and a voltage of several KV to several tens of KV is applied via the lead 21.

On the other hand, on the inner surface of the back plate 11, as shown in FIG. 2 (a) and FIG. 3 which is a cross-sectional view of a main part, the phosphor layers 17a, 17b, 17c are provided on an insulating substrate 27 such as ceramics. To support 2
A linear cathode 14 is arranged between 8 and 28 in a rack. Further, a control electrode 15 that surrounds each cathode 14 and has an opening in the phosphor layer 17a, 17b, 17c direction is arranged on the substrate 27 in the previous period, and the control electrode 15 is a ceramic or the like from the side in the longitudinal direction. It is held by a holding member 29 made of. A diffusion electrode 16 is arranged between the control electrode 15 and the acceleration electrode 19. The diffusion electrode 16 has a mesh-shaped opening whose cross section is curved in the extending direction of the cathode 14 at a position corresponding to the phosphor layers 17a, 17b, 17c. Further, the diffusion electrode 16 is the cathode 14
In addition, it is formed so as to surround the control electrode 15, and these constitute one unit. Further, a shield plate 23 is provided in this unit so that it is not affected by the electric field in other regions.

Further, a getter 25 is arranged at a position facing the back plate 11, and the getter member is scattered by heating the getter 25, and a getter film 26 is formed on the inner surface of the back plate 11. Further, 24 is a lead, which energizes the control electrode 15 via the lead wire 15a. In this way, the lead 24 is for energizing each electrode or for holding each electrode. The lead 24 is then at least a getter film 26.
In the vicinity, the end portion is bent so as to be separated from the back plate 11, and is not short-circuited with other leads via the getter film 26. In addition, the leads 24 are arranged apart from the rear plate 11 in order to prevent short-circuiting with the wiring or the like arranged on the inner surface of the rear plate 11.

[Problems to be Solved by the Invention] By the way, as a means for heating the getter 25, it is general that the getter 25 has a ring shape and induction heating is performed from the outside of the airtight envelope by using high frequency. At this time, the getter 25 is induction-heated at a high frequency, and at the same time, the lead 24 is also induction-heated.

Then, the lead 24 is thermally deformed, and remains plastically deformed even after being heated, so that the lead 24 may come into contact with an adjacent lead 24 or the rear plate 11
This caused a short circuit such as contact with the getter film 26 formed on the. Further, the lead 24 is used not only for energization but also for supporting an internal electrode, and when the lead 24 is deformed, the positional relationship of the internal electrode is different, which adversely affects the light emission display.

[Means for Solving the Problems] The present invention has been made in view of the above-described problems, and when induction heating the getter with high frequency, it prevents deformation of the lead near the getter and directly or through the getter film. The purpose is to prevent contact with other leads.

In order to achieve the above-mentioned object, the structure of the present invention comprises an airtight envelope having a front plate, a back plate and a side plate, and the inside of which is kept in a high vacuum state. And a display portion having a phosphor layer that is excited and emitted by electron beam bombardment, and is located on the back plate side facing the display portion,
An electron emission part that selectively emits electrons to the display part as necessary, a getter that forms a getter film on the back plate by high frequency induction heating, and the spine for energizing the electron emission part. In a fluorescent light emitting tube having a lead arranged on the face plate and at least in the vicinity where the getter film is formed, spaced apart from the inner surface of the back plate, a reinforcing portion is provided on the lead located near the getter. This is the configuration provided.

[Operation] With the above-described configuration, when the getter is induction-heated with a high frequency, it is possible to prevent thermal deformation of the lead near the getter.

Embodiments The present invention will be described in detail below with reference to the drawings. 1 (a) and 1 (b) are cross-sectional views of the main part of the fluorescent light emitting tube of the present invention, and FIG. 1 (a) is a cross-sectional view of the main part in a direction orthogonal to the lead extending direction. FIG. 1B is a cross-sectional view of a main part in the same direction as the lead extending direction. Incidentally, the same parts as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted.

In the vicinity of the inner surface of the back plate 11, for example, leads 24, 30 for energizing the control electrode 15 via the lead wire 15a are arranged. The leads 24 and 30 are both bent by press working or the like and are arranged apart from the inner surface of the back plate 11. Further, a part of the lead 30 arranged near the getter 25 is bent so that a reinforcing portion having a substantially L-shaped cross section extends in the longitudinal direction.

Therefore, when the getter 25 is heated at a high frequency and the getter material is scattered to form the getter film 26 on the inner surface of the back plate 11, the lead frame 30 is also heated at the same time, but the reinforcing portion 30a.
The thermal deformation is suppressed by. And lead 30
Contact the adjacent lead 24 or the getter film 26 formed on the inner surface of the back plate 11, and the other lead is contacted through the getter film 26.
A short circuit can be prevented without coming into contact with 24 and 30. Further, since thermal deformation of the leads 30 is suppressed, good light emission display can be performed without changing the positional relationship between the electrodes supported by the leads 30 such as the control electrode 15 and other electrodes and adversely affecting the display. You can

[Other Examples] Regarding the shape of the reinforcing portion, a part of the lead is bent to form the reinforcing portion as in the previous embodiment, but the lead may be embossed to form the reinforcing portion. Further, the reinforcing portion may be formed of a member different from the lead, and the reinforcing portion may be formed integrally with the lead by welding or the like.

[Effect] As described above, according to the present invention, an airtight envelope including a front plate, a back plate, and a side plate and having a high vacuum inside is provided, and the airtight envelope is disposed on the front plate side in the airtight envelope. A display unit having a phosphor layer that is provided and that is excited and emits light by electron beam bombardment, and is located on the back plate side facing the display unit and selectively bombards the display unit with electrons as necessary. An electron emission part, a getter for forming a getter film on the back plate by high frequency induction heating, and a getter disposed on the back plate for energizing the electron emission part, and at least the getter film is formed. In a fluorescent light emitting tube having a lead arranged at a position near the getter, the lead being located near the getter, a reinforcing portion is provided.

Therefore, when the getter is heated at a high frequency, the leads in the vicinity thereof are also heated, but the reinforcing portion suppresses the thermal deformation thereof. Therefore, the lead can prevent a short circuit without coming into contact with a neighboring lead or the getter film formed on the inner surface of the back plate and coming into contact with other leads through the getter film. In addition, since thermal deformation of the leads is suppressed, favorable light emission display can be performed without changing the positional relationship between the electrodes supported by the leads and other electrodes and adversely affecting the display.

[Brief description of drawings]

1 (a) and 1 (b) are cross-sectional views of a main part of a fluorescent light emitting tube of the present invention, and FIGS. 2 (a) and 2 (b) are a side sectional view and a front view of a conventional fluorescent light emitting tube. FIG. 3 is a sectional view of the main part. A: fluorescent arc tube, B: arc tube body 11: back plate, 25: getter 26: getter film, 30: lead 30a: reinforcement section

Claims (1)

[Scope of utility model registration request] 1. An airtight envelope comprising a front plate, a back plate and a side plate, the inside of which is kept in a high vacuum state, and an electron beam which is arranged on the front plate side in the airtight envelope. A display unit having a phosphor layer that emits light when excited by a bombardment, an electron emission unit that is located on the back plate side facing the display unit, and that selectively bombards the display unit with electrons when necessary; A getter that forms a getter film on the back plate by being heated by induction, and a getter film that is disposed on the back plate to energize the electron emission portion, and at least in the vicinity of the position where the getter film is formed, What is claimed is: 1. A fluorescent light emitting tube having a lead arranged apart from the inner surface of a back plate, wherein a reinforcing portion is provided on the lead located near the getter.