JPS603487Y2 - Fluorescent display tube substrate device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a substrate device used in a fluorescent display tube.

A fluorescent display tube commonly used in the past has segments 6, grids 7, and filaments 8, as shown in FIGS. 1 and 2.
All internal connections between the terminals on the board and the stem inner lead 9 are made by welding the lead wires, and many of these lead wires are also led out to the back side of the board, so this board is not suitable for display tubes. Built into the middle of the envelope.

The process of processing and assembling these boards requires a large number of man-hours, and the conventional method, especially for composite fluorescent display tubes with a large number of units, greatly increases the number of connection points, congesting the internal lead wires, and causing problems with the board. Since the substrate 1 itself is manufactured by high-temperature firing, the entire surface of the substrate 1 has accurate flatness.
It is difficult to achieve the dimensional accuracy required for other vehicle devices.

Therefore, in the case of a multi-layer composite fluorescent display tube, its reliability is significantly reduced and it becomes expensive.

Accordingly, as a conventional fluorescent display tube with a large number of digits,
There is a method described in Publication No. 3236, in which corresponding segments of each unit segment group are connected in common, but there are many welding points for lead wires, and the board is not connected to the outer enclosure. Not only is the assembly maintained in the middle of the device, but the connection wires for the corresponding segments are routed above or below the segment group, or between each segment, avoiding positions where they cross vertically with each segment. Therefore, there is a problem that the display tube becomes large or unsightly due to the portion through which the connection wiring passes.

Also, as a type of conventional display tube, U.S. Patent No. 332715
There is a method described in Specification No. 4, in which each segment is connected to its respective terminal part using lamination technology, but this method forms an anode and a cathode on the same plane. Since there is no phosphor, control grid and cathode filament in the glow discharge display device, it is impossible to immediately apply it to fluorescent display tubes in different technical fields.

In view of the above points, this invention utilizes thin film and thick film lamination technology to form internal connection wiring, anode segments, and phosphors on a substrate, and furthermore, to form a control grid and a cathode filament on the substrate. The object of the present invention is to provide a substrate device for a fluorescent display tube that is smaller in size than the conventional device, which is simple in shape, structure, and manufacture.

The present invention will now be described in detail with reference to an embodiment of a multi-layer fluorescent display tube shown in FIGS. 3 and 4.

1 is an insulating substrate made of glass or ceramic.

A conductive film forming the wiring pattern of the internal connection wiring 10 and their connection terminals 11 is deposited on this surface,
Furthermore, an insulating film 13 made of, for example, frit glass is applied to the upper surface of the connection wiring 10 except for the portion to which the terminal 11 is applied.

This insulating film 13 is provided with a conduction hole 12 for electrically connecting the connection wiring 10 to each anode segment 14, grid 16, etc. described below.

Next, a conductive film, such as a group of anode segments 14 that cross over the connection wiring 10, is deposited on the insulating film 13.

A portion of this conductive film is filled into the conductive hole 12 provided in the insulating film 13, and the connection wiring 10 and each anode segment 14 etc. are electrically connected.

The anode segment 14 has a phosphor 15 deposited on each upper surface of the anode segment 14, which is shaped like a horizontal Japanese character and a period at the lower right corner thereof, which can display a plurality of desired letters, numbers, symbols, etc. depending on the selected combination. A plurality of unit anode segment groups each consisting of a plurality of anode segments arranged in such a manner are arranged in parallel and adhered to form a shape.

Furthermore, each of the corresponding anode segments 14 of the plurality of unit anode segment groups arranged in parallel is connected to the conduction hole 12 of the plurality of unit anode segment groups arranged in parallel.
They are sequentially connected via a common internal connection wiring 10 and connected to one connection terminal 11.

These connection terminals 11 are formed in parallel along one side edge of the upper surface of the substrate 1 .

Further, the phosphor 15 on each anode segment 14 is formed in a protruding manner on the upper surface of the anode segment 14, and there is no holding recess or holding film on the outer periphery of the phosphor. The area is set slightly larger than the phosphor pattern in order to prevent the electron flow flying from the filament 17 to the anode from being disturbed by the electric charge on the substrate 1 and the insulating coating 13, causing uneven light emission in the phosphor 15.

16 is a control grid, and 17 is a filament (oxide cathode), which together with the anode segment 14 forms a triode structure.

A fluorescent display tube substrate device is formed by these.

Reference numeral 18 denotes a glass enclosure at least in a portion corresponding to the fluorescent display section on the front surface, and a frit is provided to cover at least a portion of the upper surface of the substrate 1 constituting the bottom portion of the substrate device other than the terminal 11 portion. The envelope is hermetically sealed with glass or the like to form a fluorescent display tube.

The holders 16' and 17' of the control grid 16 and the filament 17 are made of a metal material with approximately the same coefficient of expansion as the substrate 1 and the envelope 18, and are bonded to the substrate with a conductive adhesive. Alternatively, the holders 16', 17' can be directly connected.

According to the above configuration, the corresponding anode segments 14 of the unit anode segment group each having the phosphor 15 on its upper surface, which are arranged in parallel and deposited, are successively connected by the common internal connection wiring 10. Since it has a structure in which the terminals 11 are connected to one terminal 11, there is no need to provide the number of terminals corresponding to the number of each anode segment, although the number of digits is large. It can be simplified to

Further, in the structure in which the corresponding anode segments 14 of each unit anode segment group are sequentially connected by a common internal connection wiring 10, an insulating coating is laminated and deposited between the internal connection wiring 10 and the anode segment 14. Since the above connection is made through the 13 conductive holes 12,
The connection wiring 10 can be formed in a position overlapping the position where the anode segments 14 are applied, and there is no need to pass it through the gap between each anode segment 14.

Therefore, it is possible to sufficiently narrow the gap between the anode segments 14 constituting a large number of fluorescent display tubes, and it is possible to obtain a sufficiently easy-to-see display even in a large number of fluorescent display tubes.

According to the substrate device for a fluorescent display tube according to this invention, as explained above, internal connection wiring, anode segments, phosphors, etc. are formed on the substrate 1 using a highly productive laminated film structure, and Since the control grid and cathode filament are attached, the complicated internal wiring configuration required by welding lead wires, which is conventional, can be largely omitted, and the effect is that manufacturing is easy, the structure is stable, and handling is easy. There is also an effect that sufficient accuracy can be obtained in the arrangement and assembly of each of the above-mentioned members.

[Brief explanation of drawings]

Fig. 1 is a front view showing the internal structure of a conventional fluorescent display tube, Fig. 2 is a side view thereof, Fig. 3 is a front view showing an embodiment of a multi-layer fluorescent display tube according to the present invention, and Fig. 4 is a front view showing the internal structure of a conventional fluorescent display tube. It is a vertical side view same as the above. 1... Board, 10... Connection wiring, 11
...Terminal, 12...Conduction hole, 13...
... Insulating film, 14 ... Anode segment, 15 ... Phosphor, 16 ... Grid, 17 ... Filament.

Claims (1)

[Scope of utility model registration request] On an insulating substrate such as glass or ceramic, a conductive film constituting internal connection wiring and their connection terminals is first deposited by printing or the like, and then an insulating film is coated on the upper surface of the connection wiring on the substrate. A coating is deposited on the upper surface of the insulating coating, and the upper surface of the insulating coating has a plurality of upper surfaces arranged in a planar shape that can display a plurality of desired characters, numbers, symbols, etc. by selecting and combining each segment. An anode segment group consisting of anode segments having a phosphor is deposited on the anode, and at least the internal connection wiring and the anode segment are electrically connected to each other through a conduction hole provided in the insulating film. A substrate device for a fluorescent display tube, in which a control grid is provided at an upper position of a group of segments, and a cathode filament is provided above the control grid installation position.