JP2559554Y2 - Dual-sided fluorescent display tube - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a double-sided fluorescent display device in which light is displayed on both sides of an envelope.

[0002]

2. Description of the Related Art There is known a fluorescent display tube in which a light emitting display section is provided on a substrate side of an envelope and on a front plate side facing the same, and light emission of both light emitting display sections is observed from the front plate side. .
This type of fluorescent display tube is disclosed, for example, in Japanese Patent Publication No. 56-11988.
As shown in FIG. 6, the front plate has a large number of flat bottomed ship-shaped molding fronts 100 as shown in FIG.
The wiring pattern 102 leading to the 01 side could be provided on the inner surface of the molding front with ITO.

[0003] However, the molding front 100 has a problem of high cost because a molding die has to be made for each product type. Therefore, at present, a structure in which a substrate, a front plate and a frame-shaped side portion are combined is used. Is being adopted. In this case, it is difficult to form a wiring like the molding front described above.
As shown in FIG. 1239 and also shown in FIG. 7, wiring was provided on both sides of the front plate 200 and the substrate 201, and external terminals 202 and 203 were attached respectively.

[0004]

[Problem to be Solved by the Invention] The substrate 201 and the front plate 2
00 in the assembly process of sealing via the side surface portion 204,
First, according to the position of the terminal formed on the substrate 201,
A first lead frame having the external terminals 203 is mounted on the substrate. Further, a frame-shaped side portion 204 is placed thereon. Then, the second lead frame having the external terminals 202 is placed thereon, and the front plate 200 is placed thereon, and the terminals formed on the front plate 200 and the external terminals 202 of the second lead frame are aligned.

However, since the terminals of the front plate 200 are generally formed of a metal thin film, the external terminals 202 below the terminals cannot be seen from the upper surface of the front plate 200, and it has been difficult to position the terminals.

SUMMARY OF THE INVENTION It is an object of the present invention to make it possible to easily align a terminal portion and an external terminal on a front plate side in a double-sided fluorescent display tube.

[0007]

According to a first aspect of the present invention, there is provided a double-sided light emitting type fluorescent display tube having a substrate facing each other and a light transmitting property.
Envelope box-shaped formed by sealing the side portions to the front plates of
When a first display portion provided on an inner surface of the substrate, and a second display unit provided on an inner surface of the front plate, the front plate and the front
A plurality of external terminals penetrating the sealing portion between the side plates,
Provided on the front plate and connected to the inner end of the external terminal
A plurality of terminal sections, the first display section and the second
(2) In a dual emission fluorescent display tube in which a display unit is observed through the front plate , at least a part of the terminal unit is transparent.
Has a frame made of a metal thin film so that
At least a part of the inner end of the external terminal is the front plate and
It is characterized in that it is configured to be visible through the terminal portion .

[0008] Further, in the double-sided fluorescent display tube,
Forming a pattern indicating the center of the frame inside the frame
Or a thin line connected to the frame may be formed inside the frame.
May be implemented .

[0009]

The front plate is placed on the side plate placed on the substrate with the external terminals interposed therebetween. Since the inner end of the external terminal can be viewed from the light-transmitting terminal formed on the front plate, the external terminal and the terminal of the front plate can be correctly aligned.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 5, a dual emission type fluorescent display tube 1 according to an embodiment of the present invention will be described in accordance with the manufacturing process. (1) Substrate manufacturing process A1 is formed on a glass substrate by photolithography.
A wiring pattern composed of a wiring conductor and a substrate-side terminal portion is formed of a thin film. A black insulating layer having a through hole is formed on the wiring pattern by a printing method, and baked. This insulating layer
This is a black background for improving the contrast of the light-emitting display. A conductive paste is filled in the through holes of the insulating layer, and an anode conductor is printed with a carbon paste on the through holes of the insulating layer and baked.

A sealing material is printed around the substrate and fired. A phosphor is printed and fired on the anode conductor to form an anode as a first display unit. A mesh grid is disposed above the anode at a predetermined interval. The mesh grid is connected to a grid wiring provided on the substrate with a conductive adhesive.

(2) Manufacturing process of front plate 2 (FIGS. 1 and 2)
An Al thin film is formed on a front plate 1 made of light-transmitting glass or the like, and a wiring conductor, a large number of dot-shaped anode conductors 3, and terminal portions 4 are formed by etching and photolithography. The wiring conductor of this embodiment has a width of 50 μm or less (preferably 30 μm or less). The distance between the adjacent anode conductors 3 is set larger than the dimension of the anode conductor 3 so that the anode of the substrate can be observed through the display portion on the front plate 2 side.

The terminal portion 4 is a portion to which an external terminal described later is connected, and is provided along one long side of the front plate 2. The arrangement interval is set in accordance with the pitch of the external terminals described later. Most of these terminal portions 4 include a rectangular frame 5 and a plurality of thin wires 6 provided in the frame 5. Some of the terminal portions 4 include only the frames 5, and the end portions 4a of only the frames 5 correspond to positioning-only external terminals that are not used as electrodes.

When an external terminal dedicated to positioning cannot be used, a pattern consisting of a plurality of fine wires 6 finer than the end of the external terminal may be provided in the frame as described above. As shown in FIG. 2, when a stripe pattern is not provided, a mark 7 may be provided at the center of the frame 5 so that the position of the tip of the external terminal can be easily adjusted.

A black insulating layer 8 is applied by printing to a portion other than the display portion on the inner surface of the front plate 2. Printing and applying a sealing material around the inner surface of the front plate 2;
Fired and fixed.

A printing method is applied to the dot-shaped anode conductor 3.
The phosphor 9 is applied by an electrodeposition method or the like to form a dot pattern anode 10 as a second display unit. The intermediate mesh grid is bonded to the wiring conductor on the front plate 2 with a conductive adhesive.

(3) Lead frame 11 on the substrate side (FIG. 3)
In the lead frame 11 on the substrate side, a pair of cathode supports 12 are connected to each other at one end thereof by a connection bar 13. Each cathode support 1
A frame member 14 is provided between the other end portions 2 and 12. The frame member 14 is provided with a plurality of external terminals 15 connected to the terminal portions on the substrate side. A filamentary cathode 16 is welded and fixed between the cathode supports 12, 12 while applying a predetermined tension. Also, a getter 17 is attached to the cathode support 12.

(4) Lead frame 20 on front plate 2 side
(See FIG. 4) External terminals 22 connected to the terminal portions 4 and 4 a of the front panel 2 are formed on one long side of the rectangular frame 21. The pitch of these external terminals 22 is the same as that of the front plate 2 described above.
Of the terminal portions 4 and 4a.

(5) Side portions 30 (see FIG. 5) A pair of long side plates 3 made of an insulating material such as glass.
1, 31 and a pair of side plates 32, 32 having the same short dimension.
Are assembled into a rectangular frame shape using a glass adhesive to form the side surface portion 30.

(6) Imposition (Assembly) Step The substrate is mounted on a jig, and the lead frame 11 on the substrate side is mounted thereon. The terminal portion of the substrate and the inner end of the external terminal 15 of the lead frame 11 are aligned. The side surface portion 30 assembled in a frame shape is placed on the lead frame 11. The lead frame 20 on the front plate 2 side is placed on the side surface portion 30. The front plate 2 is placed from above, and the inner end 22a of the external terminal 22 is aligned with the transparent terminal portion 4a of the front plate 2. The inner end 22a of the external terminal 22 is
This positioning can be easily performed because the transparent portion in the frame 5a can be visually recognized through the front plate 2. Also, the inner end 22a of the external terminal 22 can be visually recognized even through the other terminal portion 4 having the striped thin wire 6. Then, the envelope is assembled by pressing and fixing with the jig so that the superposed components do not move. In this way, by positioning the inner end 22a of the external terminal 22 at at least one or several terminal portions 4, 4a, the external terminal 22
Are formed so as to be accurately arranged at predetermined intervals, so that the inner ends 22a of all the external terminals 22 are aligned with the respective terminals 4, 4a of the front panel 2.

(7) Sealing step The assembly of the envelope fixed by pressing with a jig is heated to about 450 ° C. in a CO ₂ gas atmosphere to remove the sealing material provided around the substrate and the front plate. It is melted and hermetically sealed.

(8) Exhaust / Aging Step The inside is evacuated from an unillustrated exhaust hole (exhaust pipe) provided in the envelope, and when the inside is evacuated to a high vacuum state, the exhaust pipe is closed and sealed. Thereafter, through an aging step of causing each display unit to emit light under certain conditions, the dual emission fluorescent display tube 1 of this embodiment is completed.

In the embodiment of the present invention described above, the terminal portions 4, 4a formed on the front plate 2 have the rectangular frame 5, but this frame may be circular.

[0024]

According to the present invention, in the dual emission fluorescent display tube, at least a part of the terminal portion formed on the inner surface of the front plate has a frame made of a metal thin film so as to have translucency.
And the inner end of the external terminal is visible over the front plate.
I am able to do it. Therefore, the connection between the external terminal and the terminal portion of the front plate is ensured, and the connection failure is eliminated. Further, the assembling process is facilitated, and workability is improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a front plate according to an embodiment of the present invention.

FIG. 2 is a plan view showing another example of the shape of the terminal portion provided on the front plate according to the embodiment of the present invention;

FIG. 3 is a plan view of the lead frame on the substrate side according to the embodiment of the present invention;

FIG. 4 is a plan view of the lead frame on the front plate side according to the embodiment of the present invention;

FIG. 5 is a perspective view of a side portion according to the embodiment of the present invention;

FIG. 6 is a cross-sectional view of a conventional dual emission fluorescent display tube.

FIG. 7 is a cross-sectional view of a conventional dual emission fluorescent display tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double-sided fluorescent display tube 2 Front plate 4, 4a Terminal part 5 Frame 10 Anode as second display part 22 External terminal 22a Inner end part 30 Side part

Claims (3)

(57) [Scope of request for utility model registration] 1. A one another and the envelope of the box-shaped formed by sealing the side portions to <br/> front plates having facing substrate and the transparent first display portion provided on the inner surface of the substrate A second display unit provided on an inner surface of the front plate, the front plate and the side surface
A plurality of external terminals penetrating the sealing portion between the plates;
Provided on a face plate and connected to the inner end of the external terminal
A plurality of terminals, wherein the first display unit and the second display unit
In a dual emission fluorescent display tube in which a part is observed through the front plate , at least a part of the terminal part has translucency.
It has a frame made of a metal thin film and has an inner end of the external terminal.
At least a portion of the portion through the front plate and the terminal portion
A double-sided fluorescent display tube configured to be visible . 2. A frame indicating the center of the frame inside the frame.
Both surface emission type fluorescent display tube of claim 1, wherein the turn is formed. 3. A thin line connected to the frame inside the frame.
Dual emission type fluorescent display tube of claim 1, wherein are formed.