JPH0322842Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluorescent display tube, and more particularly to a filament mounting structure for a fluorescent display tube having non-parallel filaments.

[Conventional technology]

Fluorescent display tubes were first used in calculators, and their uses have expanded to include home appliances such as clocks, radios, and televisions. In these applications, the shape was rectangular or square, but as the applications gradually expand, shapes other than rectangles and squares, such as trapezoids, ovals, and circles, where the filaments are non-parallel (hereinafter referred to as irregular shapes) are being used. Fluorescent display tubes (expressing) are required.

Conventionally, this type of irregularly shaped fluorescent display tube is produced by printing an Ag power supply line and an insulating layer on a trapezoidal glass substrate 1, and coating it with a phosphor 2, as shown in the plan view of FIG. 3 and the side view of FIG. An electrode paired with a grid 3 having different filament intervals on the left and right is placed on an anode substrate, and the electrodes are sealed in a vacuum-tight container 4 having the same shape as the anode substrate. .

[Problem that the invention attempts to solve]

In the conventional method having the structure of the conventional irregular-shaped fluorescent display tube described above, the distance between the filaments 5 and 5' is larger on the right side (200 display) for the speedometer shown in Fig. 3 than on the left side (0 display). ,
Because the amount of phosphor emitted from the filament 5 per unit area is small, the brightness on the right side is darker than on the left side, and the left and right brightness cannot be balanced, resulting in poor display quality. It was hot.

[Means for solving problems]

The present invention is characterized in that the heights of the grid and the filament group whose filament intervals are not parallel are changed from side to side to correct the non-uniformity of brightness.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the present invention. The anode substrate 1 has a trapezoidal shape due to the display pattern 2, and therefore the spacing between the filaments is different on the left and right sides.

As will be explained using the side view of FIG. 2, the emitters emitted from the filament 5 are
This structure has a structure in which the phosphor 2 is accelerated to excite the phosphor 2 and emit light, but since the filament spacing on the 200 display side shown in Figure 1 is larger than that on the 0 display side, the amount of emission per unit area does not decrease. The distance between the filament 5 and the grid 3 on the 200 display side is made smaller than on the 0 display side, and the distance between the filament 5 and the grid 3 is sloped.

[Effects of the invention] As explained above, the present invention prevents deterioration in unit quality due to the pitch difference of non-parallel filaments by changing the spacing between the filaments and the grid.
It becomes possible to provide an excellent irregularly shaped fluorescent display tube.

[Brief explanation of the drawing]

Figure 1 is a plan view of the first embodiment of the present invention;
The figure is a side view, Fig. 3 is a plan view of a conventional irregularly shaped fluorescent display tube, and Fig. 4 is a side view. ...vacuum-tight container, 5 and 5'...filament.

Claims (1)

[Scope of utility model registration request] In a fluorescent display tube that has a group of nonparallel filaments and whose envelope has an outer shape other than rectangular or square, the distance between the filaments and the grid in the side where the filament spacing is wide is the filament and the grid in the side where the filament spacing is narrow. A fluorescent display tube characterized in that the spacing is smaller than the spacing of the fluorescent display tube.