JP4249842B2 - Fluorescent display tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fluorescent display tube, and more particularly to a filament anchor (hereinafter referred to as anchor) structure of a fluorescent display tube with a built-in semiconductor element.
[0002]
[Prior art]
Display elements that display a predetermined pattern or graphic on the display section of calculators, audio, home appliances, measuring instruments, medical equipment, etc., various light sources such as backlights, printer heads, light sources for fax machines, and light sources for copiers, flat-screen televisions For example, fluorescent display tubes are frequently used.
In the fluorescent display tube, an anode layer and a wiring layer having a phosphor layer surface are formed on the surface of a glass substrate constituting a part of a vacuum envelope, and a filament for emitting electrons above the anode substrate, the filament It has a structure in which an anchor that suspends and gives a predetermined tension, a grit that controls the movement of emitted electrons, and the like are combined.
[0003]
A conventional anchor will be described with reference to FIG. FIG. 5 is a perspective view showing an anchor provided on at least one end of the insulating substrate.
A conventional anchor 10 includes an anchor base 12 fixed on a filament frame 11 on an insulating substrate 2, an arm body 13 having a predetermined length formed on one side thereof, and a filament fixing formed on a distal end portion of the arm body. Part 14. By bending the arm body 13 against its elasticity, the filament 7 to which a predetermined tension is applied is suspended and held.
The conventional anchor 10 is formed into a shape in which a plate material is punched into a predetermined shape and bent to obtain a predetermined spring property. A conventional punching shape is shown in FIG. FIG. 6 is a plan view of the anchor 10 punched out.
The portions to be the arm body 13 and the filament fixing portion 14 are punched out at predetermined intervals in a substantially L shape having a predetermined width and length on one side of the anchor base portion 12. The anchor 10 shown in FIG. 6 is obtained by performing the valley fold in the figure at the root (C portion) of the arm body 13 and the mountain fold in the figure at the tip (D portion) of the arm body 13.
[0004]
Conventionally, as such an anchor structure, the arm body is widened at the base portion so that necessary tension can be obtained even when the arm body is short (Japanese Patent Laid-Open No. 9-326242). An example in which resonance of the filament is suppressed by adopting a structure in which different tensions can be applied to a plurality of filaments (Japanese Patent Laid-Open No. 11-016522), and by forming a convex portion on the filament fixing portion, An example in which weldability is improved (JP-A-6-203774) is known.
[0005]
On the other hand, a fluorescent display tube with a built-in semiconductor element in which a drive circuit and a control circuit are incorporated is known as a fluorescent display tube which can omit an external lead line and improve the overall size and display density. For example, there is known a fluorescent display tube with a built-in semiconductor element having a structure in which a semiconductor element is arranged below a convex portion formed by a metal support that supports a filament or a grid electrode. (Actual Publication No. 4-14843).
[0006]
[Problems to be solved by the invention]
However, the fluorescent display tube using the conventional anchor has a problem that it becomes difficult to maintain the distance between the grid electrode and the filament at, for example, 0.5 to 1.0 mm, and sufficient light emission luminance cannot be obtained. That is, in the conventional anchor, since the arm body of the anchor is valley-folded at the base, the filament fixing portion is positioned at least at a height greater than the width of the arm body. Particularly, in the fluorescent display tube with a built-in semiconductor element in which a semiconductor element is built under the anchor, there is a problem that the position of the filament becomes too high and it becomes difficult to obtain sufficient light emission luminance.
In addition, even in a conventional fluorescent display tube that does not contain a semiconductor element, the arm body needs to have a certain width in order to give a predetermined tension to the filament, so the height of the filament fixing part can be adjusted arbitrarily. There was a problem that I could not.
[0007]
Further, in the fluorescent display tube with a built-in semiconductor element, when the semiconductor element is installed in a place different from the place where the anchor is installed, the outer diameter of the display tube with respect to the display portion increases by the amount of the semiconductor element. Further, in order to prevent malfunction due to external light, electrons radiated from the filament, deposition of evaporating substance, etc., there is a problem that a shielding portion must be provided in the semiconductor element, and the dead space cannot be reduced. In particular, in the case of a large fluorescent display tube having a long filament, anchors must be installed on both sides of the display tube, resulting in a problem that the dead space becomes larger.
[0008]
The present invention has been made in order to cope with such a problem. The anchor structure can arbitrarily set the height position of the filament fixing portion, and can provide sufficient light emission luminance even in a fluorescent display tube with a built-in semiconductor element. It aims at providing the fluorescent display tube which has these.
[0009]
[Means for Solving the Problems]
The fluorescent display tube of the present invention includes an insulating substrate having a phosphor layer on a surface thereof, a filament frame partially formed on the insulating substrate having a predetermined height, the filament frame, and the insulating substrate. A semiconductor element disposed therebetween, and a filament anchor for applying a predetermined tension to a filament suspended opposite to the phosphor layer attached to the surface of the filament frame opposite to the surface on which the semiconductor element is disposed With
The filament anchor has an anchor base attached to the filament frame and protrudes from one side of the anchor base with a predetermined length, and is bent along the notch of the filament frame at a base portion at a substantially right angle to the insulating substrate direction. and arms were, a distal end portion of the bent the arms, bent at a substantially right angle with the arm member consists of a filament fixing part which is positioned away from the anchor base direction opposite to the above insulating substrate direction By fixing the filament to the fixing portion, the filament is suspended and held at a position away from the filament frame in a direction opposite to the insulating substrate direction .
[0011]
According to the present invention, the filament can be stretched at a position near the surface height of the anchor base by bending the arm body of the anchor in the direction of the insulating substrate at the side surface in the length direction of the anchor. As a result, even in a fluorescent display tube incorporating a semiconductor element, the spacing between the grid electrode and the filament can be maintained at a predetermined interval without increasing the volume of the fluorescent display tube, and the dead space of the display unit can be reduced. .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described with reference to FIGS. 1 is a perspective view showing an anchor portion of a fluorescent display tube with a built-in semiconductor element, and FIG. 2 is a cross-sectional view taken along line AA in FIG. The fluorescent display tube has a wiring layer, an insulating layer, a conductor layer (not shown) on an insulating substrate 2 such as a glass substrate, and an anode portion obtained by sequentially laminating and forming a phosphor layer on the conductor layer. A grit electrode is disposed so as to cover the electrode, and a filament 7 serving as a cathode electron emission source facing the phosphor layer is suspended above the grit electrode by an anchor 1 formed on at least one end of the insulating substrate 2. ing.
[0013]
The anchor 1 is formed at an anchor base portion 4 fixed on a filament frame 3 formed on an insulating substrate 2, an arm body 5 having a predetermined length protruding from one side thereof, and an end portion of the arm body. And a base portion thereof is bent in the direction of the insulating substrate 2.
The anchor base 4 is fixed on the filament frame 3 formed at a predetermined height with respect to the insulating substrate 2. If the filament frame 3 is not required, the anchor base 4 itself can be formed at a predetermined height with respect to the insulating substrate 2.
The height from the insulating substrate 2 to the filament frame 3 only needs to be a height at which at least the semiconductor element 8 can be formed below the semiconductor element 8. By providing the semiconductor element 8 below the filament frame 3, the semiconductor element 8 can be shielded from external light, emitted electrons, etc., and by adjusting the width of the filament frame 3, a so-called end cooling distance is secured. can do.
[0014]
The filament frame 3 is made of a pair of 426 alloys formed at both ends on the insulating substrate 2 and having a predetermined height, and the semiconductor element 8 is disposed between the filament frame 3 and the insulating substrate 2. The
The filament 7 is a direct heating type oxide cathode in which a tungsten fine wire having a diameter of about 10 μm is coated with carbonate ((Ba, Sr, Ca) CO ₂ ), and is used by heating to 600 to 700 ° C. The deflection of the filament 7 due to thermal expansion during heating is absorbed by the anchor 1. Therefore, the anchor 1 only needs to be able to apply tension that does not cause deflection when the filament 7 is used in the fluorescent display tube.
The fluorescent display tube is obtained by sealing the whole substrate with a light-transmitting vacuum hermetic container using low melting point glass or the like.
[0015]
An anchor 1 used in the present invention will be described with reference to FIG. FIG. 3 is a plan view of an anchor fixed to the filament frame 3. FIG. 3 (a) shows a fixed state, FIG. 3 (b) shows a molded state, and FIG. 3 (c) shows FIG. It is the figure seen from the direction.
The anchor 1 is formed by punching a plate material, for example, a stainless steel thin plate into a predetermined shape and bending it so as to obtain a predetermined spring property.
First, the portions to be the arm body 5 and the filament fixing portion 6 are punched out at predetermined intervals in a substantially L shape having a predetermined width and length on one side of the anchor base portion 4. In the base portion of the arm body 5 (the broken line C portion shown in FIG. 3A), a mountain fold is formed in the drawing, and at the tip of the arm body 5 (the broken line D portion), a valley fold is formed in the drawing (FIG. 3B). The anchor 1 shown in FIG. 1 is obtained.
The predetermined width and length of the arm body 5 are set in a range where a tension is obtained in which the filament 7 does not always bend.
[0016]
A cutout 9 is provided in the filament frame 3 so that the arm body 5 can be bent at a substantially right angle in the direction of the insulating substrate 2 from the root (dashed line C portion) which is the side surface in the length direction of the arm body 5. .
Further, it is preferable that the filament fixing portion 6 protrudes from the upper surface of the anchor base portion 4 after the arm body 5 is bent at the broken line C portion. For example, when the filament fixing part 6 is located on the anchor base part 4 side with respect to the dotted line E extending the broken line at the part C in FIG. The fixing part 6 can be protruded (FIG. 3C). By setting in this way, the filament 7 can be suspended and held above the filament frame 3.
[0017]
The shape of the filament fixing part 6 protruding from the upper surface of the anchor base part 4 is such that the filament fixing part 6 is positioned closer to the anchor base part 4 than the line extending from the broken line at the C part which is a bent part. Any other shape may be used as long as it has a shape. An example of another shape is shown in FIG. FIG. 4A is a plan view showing an example in which the filament fixing part 6 is positioned higher than the anchor base part 4, and FIG. 4B shows an example in which the shape of the arm body 5 is an arc shape. It is a top view.
[0018]
In the present invention, the anchor base 4 may be formed at a predetermined height with respect to the insulating substrate 2 and the arm body 5 may be bent at a substantially right angle from the root toward the insulating substrate 2. Therefore, even if the punched shape of the anchor 1 is the shape of the conventional example in FIG. 6, the anchor base is formed at a predetermined height, so that even if it is bent from the base (C portion) of the arm body into a mountain fold in the figure It can be used as an anchor that holds the filament 7 under the anchor base 4. In this case, an anchor can be provided under the filament frame 2 to provide a fluorescent display tube in which the anchor cannot be seen from the display screen.
[0019]
The tension of the filament 7 applied by the anchor 1 is determined by the material of the arm body 5, the amount of deflection, the width, the length, the thickness, and the like. In the present invention, the anchor base 4 is formed at a predetermined height, 5 is bent in the direction of the insulating substrate at the base portion thereof, the tension of the filament 7 can be arbitrarily adjusted by a known method, and the interval between the grit and the filament 7 can also be arbitrarily adjusted.
[0020]
Further, the present invention can be applied to a conventionally known fluorescent display tube because only the anchor structure needs to be changed. For example, a frame-type fluorescent display tube consisting of a metal frame with a grid frame, filament support, and lead pins, a grid formed in advance on a substrate, an internal electrode such as a filament support is fixed with glass paste, etc., and a wiring pattern is formed with a conductive paste. Card edge type fluorescent display tube connected to the outside and connected to the plate with conductive paste, and a new intermediate type fluorescent display tube with filament support and lead pins formed in a frame .
[0021]
【The invention's effect】
The present invention relates to an anchor base portion in which an anchor has a predetermined height on an insulating substrate, an arm body having a predetermined length formed to protrude from one side of the anchor base portion, and a tip portion of the arm body Since the arm body is bent in the direction of the insulating substrate at the base portion, the height position of the filament fixing portion from the insulating substrate can be arbitrarily set. As a result, the light emission luminance of the fluorescent display tube can be improved.
Further, even in a large fluorescent display tube in which anchors are installed on both sides of the display tube, the dead space can be reduced and the fluorescent display tube can be reduced in size.
[0022]
In addition, since the semiconductor element is disposed between the anchor base formed on the insulating substrate having a predetermined height and the insulating substrate, the display area is enlarged even in the case of a fluorescent display tube with a built-in semiconductor element. In addition, since the distance between the filament and the grit electrode can be kept optimal, the light emission luminance of the fluorescent display tube is improved and the display quality is improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an anchor portion of a fluorescent display tube with a built-in semiconductor element.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
FIG. 3 is a diagram for explaining an anchor;
FIG. 4 is a view showing another shape of an anchor.
FIG. 5 is a perspective view showing an anchor portion of a conventional fluorescent display tube.
FIG. 6 is a plan view of the anchor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Anchor 2 Insulation board 3 Filament frame 4 Anchor base 5 Arm body 6 Filament fixing | fixed part 7 Filament 8 Semiconductor element 9 Notch

Claims (1)

An insulating substrate having a phosphor layer on a surface thereof, a filament frame partially formed on the insulating substrate having a predetermined height, and a semiconductor element disposed between the filament frame and the insulating substrate; A fluorescent display tube provided with a filament anchor attached to a surface of the filament frame opposite to the surface on which the semiconductor element is disposed, and applying a predetermined tension to a filament suspended opposite to the phosphor layer Because
The filament anchor has an anchor base portion attached to the filament frame and a predetermined length protruding from one side of the anchor base portion, and is bent along the notch of the filament frame at a base portion substantially perpendicular to the insulating substrate direction. and arms were, a distal end portion of the bent the arms, from the front Kiudetai substantially perpendicular to bent filaments fixing unit located away in the opposite direction to the insulating substrate direction from the anchor base The fluorescent display tube, wherein the filament is suspended and held at a position away from the filament frame in a direction opposite to the insulating substrate direction by fixing the filament to the fixing portion.

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