JP4855772B2 - Fluorescent display device - Google Patents

Description

  The present invention relates to a fluorescent display device in which a cathode, a grid, and an anode coated with a phosphor are housed in an evacuated envelope.

  The configuration of a conventional fluorescent display device is shown in FIG. In the figure, a fluorescent display device 100 is composed of a substrate 111, a windshield 112 having at least a part of transparency, and a spacer glass 113 disposed between them, and each member is constituted by frit glasses 114 and 115. The envelope 101 is formed by bonding. Inside the envelope 101, printed wiring is firstly printed (not shown) on the substrate 111, and a plurality of anodes are disposed thereon via an insulating layer (not shown). Is attached. The plurality of anodes constitute a display unit 121 that can display a predetermined pattern. For example, the anodes are arranged in a matrix and are shown as a display unit 121 composed of a large number of dots in the drawing. A strip or rectangular grid 122 is arranged above the display unit 121. The grid 122 includes, for example, a mesh part 122a and a fixing part 122b that are suspended in parallel to each other so as to cover the display part 121. A plurality of cathodes 123 are arranged above the grid 122. For example, the cathode 123 includes a plurality of filament cathodes arranged in a direction orthogonal to the longitudinal direction of the grid 122.

  Here, the cathode 123 is stretched by a filament support body 124 having an anchor and a filament support body 125 having a support. From the lead pins 126 and 127 which are a part of the filament support bodies 124 and 125, the outside of the envelope 101. To be derived. In FIG. 5, the bases 124a and 124b of the cathode 123 are arranged on the substrate 111 in the vicinity of both ends in the longitudinal direction of the substrate 111, and are suspended from the frames 124a and 125a. A cathode 123 is constructed from the anchor 124b and the support 125b.

  In such a fluorescent display device 100, when electric power is supplied to the lead pins 126 and 127 from the outside, the electric power reaches each cathode 123 via the frames 124a and 125a, the anchor 124b, and the support 125b, Heat. Then, thermoelectrons are emitted uniformly from each cathode 123. The thermoelectrons pass through a predetermined grid 122 in accordance with electric power and signals input from the outside to the grid 122 and the anode, are accelerated by the predetermined anode, and are a predetermined phosphor applied to the anode of the display unit 121. Collide with. Light emission occurs due to the collision with the phosphor, and a predetermined display is performed.

  As described above, in the conventional fluorescent display device, thermoelectrons are emitted from all the cathodes 123. However, if thermoelectrons are emitted only from the cathode 123 necessary for display, power consumption can be reduced. For this reason, some proposals have conventionally been made on fluorescent display devices that emit thermoelectrons only from the cathode necessary for display (see, for example, Patent Documents 1 to 3).

Japanese Utility Model Publication No. 60-55063 Japanese Utility Model Publication 2-5872 JP 2001-76655 A

  However, the conventional fluorescent display device has the following problems.

  In the inventions disclosed in Patent Documents 1 and 2, a plurality of filament supports are arranged, and the filament cathode is energized for each filament support. For this reason, in a fluorescent display device in which a large number of cathodes are provided, a large number of filament supports must be provided. Therefore, the structure of the filament support becomes complicated and the assembly process becomes complicated, making it difficult to improve productivity. It was. Further, an extra space is required to arrange the filament support, and it is difficult to promote downsizing.

  In the invention disclosed in Patent Document 3, a plurality of filament supports are provided and electrically insulated from adjacent filament supports by crossing them three-dimensionally or by making their shapes crank-like. The filament cathode is energized for each filament support. For this reason, the structure of the filament support becomes complicated, and it takes time to align the length of the filament cathode and to fix the filament support. As a result, it is difficult to improve productivity. It was.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a fluorescent display device capable of realizing improvement in productivity and power saving.

  In order to solve the above-described problems, a fluorescent display device according to the present invention is a fluorescent display device in which a plurality of filaments are installed by a pair of filament supports disposed opposite to each other inside an envelope, and the filament support At least one of the bodies includes a plurality of frames having support portions connected to one end of the filament, and an insulating member that fixes the frames apart from each other.

  The fluorescent display device may further include a fixing portion for attaching the frame to the insulating member. Further, the filament support may be provided with a lead pin connected to an external circuit for each frame. The insulating member may be made of a ceramic material.

  According to the present invention, it is possible to selectively supply power to the filament without adopting a complicated structure by separating a plurality of divided frames from each other and fixing them to the insulating member, thereby improving productivity. In addition, power saving can be realized.

  Embodiments of a fluorescent display device according to the present invention will be described below in detail with reference to the drawings. The fluorescent display device according to the present embodiment is the same except that the structure of the filament support having the anchor of the fluorescent display device 100 described in the background art section with reference to FIG. 5 is different. Therefore, the same name and code | symbol are attached | subjected about the component equivalent to the fluorescence display apparatus 100 shown in FIG. 5, and description is abbreviate | omitted suitably.

  The fluorescent display device according to the present embodiment includes an envelope 101 formed by bonding a substrate 111, a windshield 112, and a spacer glass 113 with frit glasses 114 and 115, and the envelope 101. The display unit 121, the grid 122, and the cathode 123 are configured.

  Here, the cathode 123 is stretched by the filament support body 10 having an anchor as a connection portion and the filament support body 125 having a support as a connection portion. Here, as shown in FIG. 1, the filament support 10 has a generally rectangular plate shape in plan view and is divided into a first frame 11-1 and a second frame 11-2 at an arbitrary position. The frame 11, the connecting member 12 placed on the main surface of the frame 11, a plurality of anchors 13 disposed on one side parallel to the longitudinal direction of the frame 11, and the connecting member 12 on the frame 11 And stoppers 14 formed in the vicinity of both ends in the longitudinal direction.

  The frame 11 includes a base 11a having a rectangular or rectangular shape, lead pins 11b and 11c formed at both ends in the longitudinal direction of the base 11a, and anchors formed on one side parallel to the longitudinal direction of the base 11a. 13d, a bent part 11e formed on the side opposite to the side having the attached part 11d and bent vertically from the base 11a, and a bent part 11e having a rectangular or rectangular shape. And a plurality of fixing portions 11f formed on the side opposite to the base 11a at predetermined intervals. The frame 11 is divided at an arbitrary position, and a first frame 11-1 including a lead pin 11b and a second frame 11-2 including a lead pin 11c are formed. Such a frame 11 is comprised from electrically conductive materials, such as 426 alloy, for example. For convenience, in the following, the longitudinal direction of the frame 11 is referred to as a first direction, and the direction orthogonal to the first direction is referred to as a second direction.

  The connecting member 12 has, for example, a rectangular parallelepiped rod shape. Such a connecting member 12 is made of, for example, ceramics. As a material of the connecting member 12, not only ceramics but also an insulating material such as a metal whose surface is subjected to an insulating treatment, desirably a material having an insulating property and a heat resistance, can be used as appropriate. . For convenience, in the following, a surface perpendicular to the longitudinal direction of the connecting member 12 is referred to as an upper surface or a lower surface, and a surface parallel to the longitudinal direction is referred to as a side surface.

  The anchor 13 includes a base portion 13a, an arm 13b made of a spring material suspended from the base portion 13a, and a connection portion 13c provided at an end portion of the arm and formed substantially parallel to the base portion 13a. Such an anchor 13 is provided in each of the divided first frame 11-1 and second frame 11-2. Here, one or more arms 13b are fixed to each base portion 13a. The number of arms 13b provided on each base portion 13a is set according to the sizes of the first frame 13a and the second frame 13b. In the present embodiment, four arms 13b are provided on each of the first frame 13a and the second frame 13b. Such an anchor 13 is made of an elastic material having conductivity such as SUS631.

  The stopper 14 is formed in a substantially rectangular cutout formed in the frame 11 in a plan view, and is formed of a substantially rectangular member in plan view with one side connected to the frame 11. Such a stopper 14 is formed integrally with the frame 11. The planar shape of the stopper 14 is not limited to a substantially rectangular shape, and can be set freely as appropriate, such as a triangle or a semicircle.

  Next, the manufacturing method of the filament support body 10 is demonstrated with reference to FIGS. First, a frame 11 processed into a predetermined shape is prepared, and the frame 11 is divided in a second direction at an arbitrary position. Thereby, as shown to Fig.2 (a), the 1st frame 11-1 and the 2nd frame 11-2 are formed.

  When the frame 11 is divided, the bent portions 11e and the stoppers 14 of the first frame 11-1 and the second frame 11-2 are bent as shown in FIG. The bent portion 11e and the stopper 14 are bent according to the shape of the connecting member 12. In the present embodiment, since the connecting member 12 has a substantially rectangular cross section, the bent portion 11e is formed with respect to the base 11a so that the base 11a and the bent portion 11e of the frame 11 abut against the connecting member 12. The bent portion 11e is bent so as to be vertical. Accordingly, the bent portion 11e and the fixing portion 11f connected to the bent portion 11e are suspended from the base 11a. By bending the bent portion 11e in this way, the strength against bending of the base 11a can be improved. Similarly, the stopper 14 is bent so as to be perpendicular to the base 11 a so that the stopper 14 also comes into contact with the upper surface or the lower surface of the connecting member 12.

  When the bent portion 11e and the stopper 14 are bent, the connecting member 12 is placed on the first frame 11-1 and the second frame 11-2 as shown in FIG. The connecting member 12 is processed according to the shape of the frame 11 in advance. Such a connecting member 12 has one side surface in contact with the base 11a of the first frame 11-1 and the second frame 11-2, and the other side surface having the first frame 11-1 and the second frame 11-2. Placed in contact with the bent portion 11e. At this time, the connecting member 12 is placed in a state in which the first frame 11-1 and the second frame 11-2 are separated from each other by a predetermined distance in the first direction. The predetermined interval is set as appropriate according to the shape of the envelope of the fluorescent display device, the interval at which the cathode 123 is disposed, and the like. The first frame 11-1 and the second frame 11-2 may be spaced apart from each other by bringing the upper and lower surfaces of the connecting member 12 into contact with the stopper 14. By bringing the connecting member 12 into contact with the stopper 14, it is possible to prevent the connecting member 12 from shifting in the first direction.

  When the connecting member 12 is placed, as shown in FIG. 3A, the end of the fixed portion 11f on the bent portion 11e side is bent. At this time, the fixing portion 11f is bent to a height that does not contact the cathode 123 when at least the cathode 123 is disposed. Preferably, as shown in FIG. 3B, the fixing portion 11f is bent so that the connecting member 12 is held between the base 11a and the fixing portion 11f. Thereby, the connection member 12 will contact | abut to the base 11a, the fixing | fixed part 11f, and the bending part 11e of the 1st frame 11-1 and the 2nd frame 11-2.

  When the end portion of the fixing portion 11f on the bent portion 11e side is bent, the end portion of the fixing portion 11f opposite to the bent portion 11e is bent as shown in FIG. At this time, the fixing portion 11f winds around the connecting member 12, that is, the end portion on the opposite side to the bent portion 11e comes into contact with the surface on the opposite side to the surface that comes into contact with the bent portion 11e of the connecting member 12, And it bend | folds so that it may contact | abut to the base 11a. Thereby, each side surface of the connection member 12 will contact | abut to any of the base 11a, the fixing | fixed part 11f, and the bending part 11e. In this state, the end of the fixed portion 11f opposite to the bent portion 11e is welded to the base 11a. As a result, the first frame 11-1 and the second frame 11-2 are fixed to the connecting member 12, that is, are connected by the connecting member 12.

  When the bent portion 11e is fixed, the anchor 13 is fixed to the first frame 11-1 and the second frame 11-2, respectively, as shown in FIG. This is performed by welding the base portion 13a of the anchor 13 to the attachment portions 11d of the first frame 11-1 and the second frame 11-2. The anchor 13 is formed in advance for each of the first frame 11-1 and the second frame 11-2 according to the shape of the mounting portion 11d. When the anchor 13 is fixed, one end of the cathode 123 is welded and fixed to the connecting portion 13c of the anchor 13. The multiple ends of the cathode 123 are fixed to a filament support having a support. Thereby, the cathode 123 is constructed.

  When thermionic electrons are emitted from the cathode 123 installed in this way, power is supplied from an external circuit to the lead pins 127 of the filament support 125 having a pair of supports for the lead pins 11b and 11c of the filament support 10 and the filament support 10. To do. At this time, the cathode 123 supported by the first frame 11-1 receives power from the first circuit including the lead pin 11b, the first frame 11-1, the filament support 125, the lead pin 127, and an external circuit. Supplied. On the other hand, power is supplied to the cathode 123 supported by the second frame 11-2 from a second circuit including the lead pin 11c, the second frame 11-2, the filament support 125, the lead pin 127, and an external circuit. Is done. Here, since the first frame 11-1 and the second frame 11-2 are spaced apart by the connecting member 12 made of an insulating material, they are electrically insulated. Therefore, the first circuit and the second circuit can be energized independently. For this reason, electric power can be independently supplied to the cathode 123 supported by the first frame 11-1 and the cathode 123 supported by the second frame 11-2. Thereby, thermoelectrons can be emitted only to the necessary cathode 123 according to the display of the fluorescent display device, so that power consumption can be reduced.

  As described above, according to the present embodiment, the frame 11 of the filament support 10 is divided, and these are separated from each other by the connecting member 12 made of an insulating material, thereby insulating the divided frames. be able to. For this reason, since the cathode 123 can be energized in divided frame units, the cathode 123 to be energized can be selected according to the display of the fluorescent display device, and as a result, power saving can be realized. .

  Further, according to the present embodiment, since the divided frame 11 is fixed by the connecting member 12, the cathode 123 can be selectively energized, so that a complicated structure as in the prior art is not necessary, and as a result As a result, productivity is improved. In addition, since a complicated structure is unnecessary, downsizing can be promoted.

  In the present embodiment, the shape of the connecting member 12 is a rectangular parallelepiped shape, but the shape of the connecting member 12 is not limited to a rectangular parallelepiped, and can be freely set as appropriate, such as a cylinder or a polygonal column. At this time, it is desirable that the bent portion 11e and the fixed portion 11f be bent in accordance with the shape of the connecting member 12 when bent, that is, so that the contact area with the fixed portion 11f is increased. Further, the thickness of the connecting member 12 can be appropriately set as long as it does not come into contact with the cathode 123 when the cathode 123 is installed by the filament support 10. The thickness is preferably larger in view of the bending strength of the filament support 10 and the like.

  In the present embodiment, as shown in FIGS. 1 to 4, two fixing portions 11 f are provided in each of the first frame 11-1 and the second frame 11-2. Is not limited to two, and can be freely set according to the size of the divided frames. Thereby, it becomes possible to divide and fix frames of various shapes.

  In the present embodiment, the frame 11 is divided into two. However, the number of frames 11 to be divided is not limited to two, and can be set as appropriate. For example, the frame may be divided into three. At this time, the lead pins of the divided frames can be prevented from interfering with the lead pins of other frames by providing them as shown in FIG.

  First, in the case of the filament support 20 shown in FIG. 4A, the frame 21 is divided into a first frame 21-1, a second frame 21-2, and a third frame 21-3. At this time, the lead pin 22a included in the first frame 21-1 is provided on one end side of the frame 21 in the first direction. On the other hand, the lead pin 22b included in the second frame 21-2 and the lead pin 22c included in the third frame 21-3 are provided on the other end side in the first direction.

  In the case of the filament support 30 shown in FIG. 4B, the frame 31 is divided into a first frame 31-1, a second frame 31-2, and a third frame 31-3. At this time, the lead pin 32a included in the first frame 31-1 is provided on one end side of the frame 31 in the first direction. The lead pin 32b included in the second frame 31-2 is provided in a direction orthogonal to the second direction. The lead pin 32c included in the third frame 31-3 is provided on the other end side in the second direction.

  Even in this case, since the cathode can be energized in units of frames, power saving can be realized. Further, since the divided frame is fixed by the connecting member, the cathode can be selectively energized, so that a complicated structure as in the prior art becomes unnecessary, and as a result, productivity is improved.

  Further, in this embodiment, a structure in which a frame is divided and a connecting member is provided on the filament support 10 having an anchor as a connecting portion for connecting the cathode 123 is applied. However, a filament having a support as the connecting portion. You may make it apply the structure also about a support body. Moreover, you may make it apply the said structure to each of the filament support body which has an anchor, and the filament support body which has a support. Further, when the cathode is suspended by two filament supports each having an anchor, the above structure may be applied to one or both of them.

  The present invention can be applied to a support for laying an electric wire, a display device having this support, an electric heater, and the like.

It is a perspective view which shows the structure of the filament support body concerning this invention. (A)-(c) is a figure which shows the manufacturing method of a filament support body. (A)-(c) is a figure which shows the manufacturing method of a filament support body. (A), (b) is a figure which shows the structure of the other filament support body concerning this invention. It is a figure which shows the structure of the conventional fluorescence display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 20, 30 ... Filament support body 11, 21, 31 ... Frame, 11a ... Base, 11b, 11c ... Lead pin, 11d ... Mounting part, 11e ... Bending part, 11f ... Fixing part, 12 ... Connecting member, 13 ... Anchor, 13a ... Base, 13b ... Arm, 13c ... Connection part, 14 ... Stopper, 11-1, 21-1, 31-1 ... First frame, 11-2, 21-2, 31-2 ... Second Frame, 21-3, 31-3,... Third frame.

Claims (4)

A fluorescent display device in which a plurality of filaments are laid by a pair of filament supports disposed opposite to each other inside an envelope,
At least one of the filament supports includes a plurality of frames having a support portion connected to one end of the filament, and an insulating member that fixes these frames apart from each other. The fluorescent display device according to claim 1, further comprising a fixing portion that attaches the frame to the insulating member. The fluorescent display device according to claim 1, wherein the filament support includes a lead pin connected to an external circuit for each frame. The fluorescent display device according to any one of claims 1 to 3, wherein the insulating member is made of a ceramic material.

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