JPH10106499A - Fluorescent lamp for display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To almost equalize discharge voltages with respective anodes by arranging communicating holes of a shielding plate in a position where dispersion of respective discharge passage lengths between the respective anodes and a cathode can be reduced as much as possible. SOLUTION: In a belly part 20c of a shielding plate 20, communicating holes 21a and 21b penetrating in the plate thickness direction are protrusively arranged in almost equal distance positions to the lateral both sides from the center of a cathode 7, and discharge generated between respective anodes 11 and the cathode 7 is passed through into the respective communicating holes 21a and 21b. When starting voltage is impressed between the respective anodes 11 and the cathode 7, discharge is generated, and this discharge passes through into the closest communicating hole 21a or 21b of the shielding plate 20. In this case, since the communicating holes 21a and 21b are arranged in a position where dispersion of respective discharge passage lengths between the respective anodes 11 and the cathode 7 can be reduced as much as possible and can be equalized, the dispersion of the respective discharge passage lengths between the respective anodes 11 and the cathode 7 can be reduced and equalized. Therefore, starting voltages with respective anodes 11 and lamp voltages after starting can be almost equalized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a display fluorescent lamp provided in a display device.

[0002]

2. Description of the Related Art In recent years, large-sized display devices have been required to have higher definition of displayed images. To satisfy this requirement,
It is necessary to increase the number of pixels in one screen, and the size and pitch of one pixel tend to be small.

For example, Japanese Patent Application Laid-Open No. 7-73850 discloses a display fluorescent lamp having a single tube and eight pixels. According to this conventional example, it is possible to increase the number of pixels without significantly increasing the number of lamps.

Incidentally, such a fluorescent lamp for display is not used so that all the pixels are always lit at 100% intensity, and performs dimming lighting different for each pixel depending on information of a display image. Things.

[0005] Since such a conventional fluorescent lamp is a single tube single pixel in which one pixel is formed in one bulb, it is installed in three light emitting chambers which emit red, blue, and green light forming one pixel, respectively. The anodes (anodes) are arranged at substantially equal distances from a cathode (cathode) common to the anodes.
For this reason, the discharge path lengths of the cathode and each anode are substantially equal, and there is almost no difference in discharge voltage, so that there is little variation in luminance between the light emitting chambers.

[0006]

In such a fluorescent lamp for display, many pixels tend to be densely arranged on the display surface as the display surface becomes higher definition. As a result, the number of anodes per lamp increases, and a difference occurs in the discharge path length between the common cathode and each anode. As a result, the difference in discharge voltage between the anodes increases, and the variation in luminance between the light emitting chambers increases. Becomes large.

The present invention has been made to solve the above problems, and has as its object to provide a fluorescent lamp for display capable of making the discharge voltage of each anode substantially uniform.

[0008]

According to a first aspect of the present invention, there is provided a light-transmitting front plate, a cathode chamber, and a phosphor disposed between the light-transmitting front plate and the cathode chamber. An airtight container having a plurality of light emitting chambers each having a layer formed therein, and a discharge hole communicating with the light emitting chamber and the cathode chamber formed in each light emitting chamber; a discharge medium sealed in the airtight container; A cathode disposed in a cathode chamber of the hermetic container; a plurality of anodes disposed in a light emitting chamber of the hermetic container and forming a discharge path with the cathode; and a plurality of anodes disposed between the discharge hole and the cathode. A shielding plate provided with communication holes for communicating the discharge holes and the cathode so as to correspond to the plurality of anodes.

Here, the light-transmitting front plate constitutes a display surface, and does not need to be transparent, and includes, for example, those having transmission wavelength selectivity or light diffusion. Further, a color filter made of low-melting glass or translucent resin may be formed on the outer surface or inner surface. The cathode chamber is a room in which the cathode is provided, and may be formed integrally with the light emitting chamber as long as it communicates only with the discharge holes.

The discharge hole is a hole formed in a member that partitions the light emitting chamber and the cathode chamber so that a discharge is generated between the anode in each light emitting chamber and the cathode in the cathode chamber.

The cathode is a cathode that emits electrons, and a preheated filament electrode coated with an emitter is used as a hot cathode having a low cathode drop voltage, but is not limited thereto.

The phosphor layer does not need to cover the entire inner wall of the light emitting chamber, but may be a part. When a partition member or the like is provided inside, the partition member may be formed on the wall surface of the partition member.

Here, the shielding plate includes not only a shield plate which is separate from the airtight container and is attached to the container, but also a plate integrally formed with the container. The communication hole may have various shapes such as a circular shape, a rectangular shape, an elliptical shape, and a slit shape as long as a discharge path can be formed.

According to the present invention, since each discharge generated between each anode and the cathode passes through the communication hole of the shielding plate, the communication hole is used to reduce the variation in the length of each discharge path between each anode and the cathode. By providing the discharge path at a position that can be reduced as much as possible, the discharge path length for each anode can be made as uniform as possible.

[0015] For this reason, it is possible to reduce the variation in the discharge voltage due to the variation in the discharge path length for each anode, and to equalize the brightness between the light emitting chambers at the time of lighting.

According to a second aspect of the present invention, the communication hole of the shielding plate is formed at a position where the variation of the discharge path length for each anode can be reduced.

According to this invention, the communication hole of the shielding plate is formed at a position where the variation of the discharge path length for each anode can be reduced. Play.

The invention according to claim 3 is characterized in that the number of communication holes in the shielding plate is smaller than the number of discharge holes.

According to the present invention, since the number of communication holes in the shield plate is smaller than the number of discharge holes in the light emitting chamber, the position of the communication hole in the shield plate provided at a position for equalizing the discharge path length for each anode is determined. And the discharge path length of each anode can be easily equalized.

According to a fourth aspect of the present invention, the communication hole of the shielding plate is formed at a position that does not overlap in the vertical direction facing the discharge hole of each light emitting chamber.

According to the present invention, since the communication hole of the shielding plate does not overlap with the discharge hole of each light emitting chamber, the discharge path length for each anode can be easily equalized.

A fifth aspect of the present invention is characterized in that the shielding plate is provided in the cathode chamber.

According to the present invention, since the shield plate is provided in the cathode chamber, it is possible to conceal the red heat of the discharge spot of the cathode and the discharge color of the cathode surface with the shield plate so as to be as invisible as possible from the transparent front plate. it can. For this reason, it is possible to reduce the dark luminance of the light-emitting room when it is not lit, and to improve the contrast with the light-emitting room that is lit.

The invention according to claim 6 is characterized in that a light shielding portion is formed between at least adjacent light emitting chambers of the airtight container, and a communication hole of a shielding plate is provided on the back side of the light shielding portion.

According to this invention, the contrast between the light emitting chambers can be improved by the light-shielding portion, and the communication hole of the shielding plate that does not emit light can be concealed by the light-shielding portion. Aesthetic appearance can be improved.

According to a seventh aspect of the present invention, there is provided a plurality of light-transmitting front plates, a cathode chamber, and a plurality of light-transmitting front plates, which are disposed substantially flush with each other and have a phosphor layer formed on an inner surface thereof. An airtight container in which discharge holes communicating with the light emitting chamber and the cathode chamber are formed for each light emitting chamber; a discharge medium sealed in the airtight container; and a cathode chamber of the airtight container. A cathode disposed; a plurality of anodes disposed in the light emitting chamber of the hermetic container and forming a discharge path with the cathode; and a discharge path forming plate for adjusting a discharge path length in the light emitting chamber. It is characterized by.

According to the present invention, the discharge path forming plate provides
By appropriately adjusting the length of the discharge path in each light emitting chamber, the length of the discharge path between each anode and cathode can be substantially equalized.

Thus, the discharge voltage for each anode can be substantially equalized, and the brightness between the light emitting chambers during lighting can be equalized.

According to an eighth aspect of the present invention, the discharge path forming plate is formed so that the discharge path length in each light emitting chamber is equalized between each anode and cathode. .

According to the present invention, the discharge path forming plate is formed so that the discharge distance between each anode and cathode is equalized, so that the discharge path length is equalized according to desired conditions. It can be adjusted.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A display fluorescent lamp according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference characters.

FIG. 1 is a front view of a display fluorescent lamp according to a first embodiment of the present invention, FIG. 2 is a schematic view showing a longitudinal section of FIG.
3 is a side view of FIG. 1, and FIG. 4 is a longitudinal sectional view of FIG.

In these figures, reference numeral 1 denotes an airtight container, which is a light-transmitting front panel 2, a light-emitting chamber 3, and a cathode chamber 4.
In the airtight container 1, an appropriate amount of a discharge medium such as mercury or a rare gas is sealed.

The translucent front plate 2 is formed of translucent glass. The luminous chamber 3 is made of an enamel whose entire surface including the inner and outer surfaces is coated with a glass coating, for example, a metal container having a horizontally long rectangular tube shape.
It has a plurality of vertically long rectangular light emitting chambers 5, and an opening 6 is formed on the front side. The translucent front plate 2 is hermetically sealed with a low melting point frit glass or the like in the opening 6.

The cathode chamber 4 is attached to the back of the light emitting chamber 3. The size of the cathode chamber 4 in the longitudinal direction is substantially the same as the size of the light emitting chamber 3, but the size in the direction orthogonal to the longitudinal direction is slightly smaller, and is formed of a horizontally long rectangular tube, for example, made of glass or ceramic. . A cathode 7 composed of a hot cathode is disposed in a cathode chamber 4a inside the cathode chamber section 4.

The light emitting chamber section 3 is composed of a side wall section 8 provided so as to partition between the light emitting chambers 5 and a bottom section 9 provided so as to partition from the cathode chamber section 4 side. A light emitting chamber 5 is formed with a part of the inner surface of the front plate 2.

The light emitting chamber 5 which is vertically opposed to the bottom 9
Discharge holes 10 are formed at positions close to each other, and when the entire display fluorescent lamp is viewed from the light-transmitting front plate 2 side, the discharge holes 10 are arranged in two stages at a substantially central position along the longitudinal direction. Discharge holes 10 are formed. On the opposite side of the discharge hole 10 in the light emitting chamber 5, an anode 11 is provided via a lead pin 12 which is inserted from the bottom surface portion 9 in an airtight manner.

The light-emitting chamber 5 forms one pixel by three pixels arranged in the horizontal direction, and the side wall portion 8 and the bottom surface 8 emit light in red (R), green (G), and blue (B) in order from the left. Phosphors that emit light of each light color are applied to the inner surface of the portion 9.
That is, the light-emitting room 5 of the present embodiment is provided with eight pixels arranged in two rows (rows) and four columns.

The cathode chamber 4 is formed by a back plate 13 and a side wall plate 14 provided so as to surround the periphery of the back plate 13. On the back plate 13, a cathode 7 composed of a hot cathode obtained by applying an emitter material to a filament coil is provided. The cathode 7 is electrically connected to the outside via a lead pin 15 which is inserted airtightly from the back plate 13 and is supported. Reference numeral 16 denotes an exhaust pipe projecting from the bottom to the rear. Numeral 17 denotes a mercury release structure in which a Zr-Al alloy as a getter is adhered on one surface side of the substrate and a Ti-Hg alloy is adhered on the other surface side. The mercury release structure 17 is connected to an inner conductor 18 that is inserted through the back plate 13 in an airtight manner. The mercury releasing structure 17 evaporates mercury into the hermetic container 1 by high-frequency induction heating from outside the hermetic container 1a.

On the inner surface of the translucent front plate 2, a black stripe 19 (indicated by parallel oblique lines in FIG. 1), which is a light shielding portion, is formed by printing black paint or the like.

That is, the black stripe 19 is formed so as to surround between the light emitting chambers 5 and between the pixels formed by the three light emitting chambers 5 for emitting light of R, B, and G, and to surround the periphery of each pixel. A series of black paints are formed on the inner surface of the optical front plate 2.

As shown in FIGS. 2 and 4, a shielding plate 20 having a U-shaped cross section is provided in the cathode chamber 4a.
The shielding plate 20 is formed of an electric insulating plate such as an enamel plate in which the entire outer surface of a metal substrate is coated with a glass coating or the like,
The U-shaped bent ends 20a and 20b are attached to the lower inner surface of the side wall plate 14 of the cathode chamber 4 so as to be erected and fixed by frit glass or the like.

The abdominal portion 20c of the shielding plate 20 is disposed between each discharge hole 10 of the light emitting chamber 5 and the cathode 7, and the abdominal portion 20c is located on the left and right sides from the center of the cathode 7 as shown in FIG. The communication holes 21a and 21b penetrating in the plate thickness direction at substantially equal distances toward the
A discharge (shown by a broken line in FIG. 2) generated between the cathode 1 and the cathode 7 is passed through the communication holes 21a and 21b.

As shown in FIG. 1, each communication hole 21a, 21
b denotes a shielding plate 20 at a position corresponding to the center of four pixels, for example.
At the abdomen 20c of the light emitting chamber 5 and are substantially equidistant from the anode 11 of each light emitting chamber 5 constituting these four pixels. That is, the communication holes 21a and 21b are formed at positions where the variation in the discharge path length between the anode 11 and the cathode 7 passing through the communication holes 21a and 21b can be reduced as much as possible.

Further, as shown in FIG.
1a and 21b are located inside (behind) a black stripe 19 formed at the center of the arrangement when the light-emitting chambers 5 for four pixels are arranged in a square lattice, and each discharge of these four pixels is performed. The holes 10 are shifted in the horizontal direction so as not to overlap with each other in the vertical direction.

Therefore, according to this embodiment, when a starting voltage is applied between each anode 11 and cathode 7, a discharge is generated between each anode 11 and cathode 7 as shown by a broken line in FIG. Pass through the nearest discharge hole 21 a or 21 b of the shielding plate 20.

Since these discharge holes 21a and 21b are located at positions where variations in the lengths of the respective discharge paths between the respective anodes 11 and the cathode 7 are reduced and equalized as much as possible.
The variation in the length of each discharge path between the electrode and the cathode 7 is reduced and equalized.

For this reason, the starting voltage of each anode 11 is substantially equalized, and the lamp voltage after starting is also substantially equalized. Therefore, the brightness of each light emitting chamber 5 at the time of starting and at the time of lighting is also substantially equalized.

In this embodiment, the voltage applied between each anode 11 and cathode 7 is applied to the communication holes 21 of the shielding plate 20.
Since it is not substantially equalized by a and 21b but not by a circuit element such as a current limiting resistor, it is possible to prevent the lighting circuit from becoming complicated and the accompanying cost increase.

Further, since the shielding plate 20 is provided between the discharge hole 10 and the cathode 7, the red heat of the discharge spot of the cathode 7 and the discharge color of the surface of the cathode 7 cannot be seen from the translucent front plate 2. It can be hidden by the shield plate 20.
For this reason, it is possible to reduce the dark luminance of the light emitting chamber 5 when it is not lit, and to improve the contrast with the light emitting chamber 5 that is lit.

Further, since the black stripes 19 are formed between the light emitting chambers 5, the black stripes 1 are formed.
9, the contrast between the light emitting chambers 5 can be improved.
Since the communication holes 21a and 21b of the shielding plate 20 that does not emit light can be concealed, the external appearance can be improved.

FIG. 5 is a front view of a display fluorescent lamp 31 according to a second embodiment of the present invention, and FIG. 6 is a bottom view of FIG. 5. This lamp 31 has the above-described two rows (rows) and four columns. In this embodiment, two display fluorescent lamps constituting the light emitting chamber 5 of 8 pixels are integrally connected in the horizontal direction to form 16 pixels, and an electrically insulating shielding plate 32 is disposed in the cathode chamber 4a. There is a characteristic in that it is set.

The shielding plate 32 is disposed in the horizontal direction in FIG. 6 between the discharge hole 10 of each of the light emitting chambers 5 and the pair of cathodes 7a and 7b, and the light emitting chambers 5 for four pixels are arranged in a square lattice. When arranged, communication holes 33a, 33b, 33c, 33d are formed at positions corresponding to the center of the arrangement so as to penetrate in the thickness direction. In FIGS. 5 and 6, reference numeral 34 denotes a partition which substantially divides the cathode chamber 4a into two in the horizontal direction in the figure.
Reference numerals a and 7b denote a pair of cathodes respectively disposed in the two divided cathode chambers 4a, and reference numerals 17a and 17b denote a pair of mercury emission structures similarly disposed in the respective cathode chambers 4a.

Therefore, according to this display fluorescent lamp 31, when a starting voltage is applied between each anode 11 and each cathode 7a, 7b, each anode 11 and cathode 7a, 7a,
7b, discharges are generated, and these discharges pass through any of the nearest discharge holes 33a to 33d of the shielding plate 32.

Since these discharge holes 33a to 33d are located at positions where the variations in the discharge path lengths between each anode 11 and each of the cathodes 7a and 7b are reduced and equalized, each anode 1
1 and each of the discharge path lengths between the cathodes 7a and 7b are reduced and almost equalized.

For this reason, the starting voltage of each anode 11 is substantially equalized, and the lamp voltage after starting is also substantially equalized. Therefore, the brightness of each light emitting chamber 5 at the time of starting and at the time of lighting is also substantially equalized.

Each anode 11 and each cathode 7a,
7b are connected to the communication holes 33a to 33a of the shielding plate 32.
Since it is not substantially equalized by 3d and not by circuit elements such as current-limiting resistors, it is possible to prevent the lighting circuit from becoming complicated and the resulting cost increase.

Further, since the shielding plate 32 is provided between the discharge hole 10 and the cathodes 7a, 7b, each of the cathodes 7a, 7b
Can be concealed by the shield plate 32 so that the red heat of the discharge spot and the discharge color on the surfaces of the cathodes 7a and 7b cannot be seen from the transparent front plate 2. For this reason, it is possible to reduce the dark luminance of the light emitting chamber 5 when it is not lit, and to improve the contrast with the light emitting chamber 5 that is lit.

Further, since the black stripes 19 are formed between the light emitting chambers 5, the black stripes 1 are formed.
9, the contrast between the light emitting chambers 5 can be improved.
Since the communication holes 33a to 33d of the shielding plate 32 that does not emit light can be concealed, the external appearance can be improved.

FIG. 7 is a front view of a display fluorescent lamp 41 according to a third embodiment of the present invention, FIG. 8 is a schematic view showing a longitudinal section of FIG. 7, and FIG. 9 is a side sectional view of FIG.

As shown in FIG. 7, the display fluorescent lamp 41 has two light-emitting chambers 5 that emit green (G) light, one light-emitting chamber 5 that emits red light (R), and light that emits blue light (B). One light-emitting chamber 5 is arranged in a square lattice to form one pixel, and these pixels are arranged in two rows (stages) and four columns to form eight pixels. As shown in FIG. It is characterized in that an electrically insulating shielding plate 42 is provided therein.

Each of the light emitting chambers 5 is provided with a discharge hole 10 which penetrates the bottom 9 of the inner corner adjacent to each other at the center of each pixel in the plate thickness direction. The inside of 5 communicates with the inside of the cathode chamber 4a.

As shown in FIG. 8, the shielding plate 42 is formed in a U-shape, and its U-shaped bent ends 42 a and 42 b are erected along the lower inner surface of the side wall plate 14 of the cathode chamber 4. And is fixed by frit glass or the like.

The abdomen 42c of the shielding plate 42 is
Are disposed between each of the discharge holes 10 and the cathode 7, and the abdomen 20c is formed of four pixels which are equidistant from the cathode 7 in the left-right direction in FIGS. At substantially the center, communication holes 43a and 43 penetrating in the thickness direction
b is drilled.

Then, as shown in FIG.
Since the discharge generated between the cathode 1 and the cathode 7 passes through the communication holes 43a and 43b of the shielding plate 42 as shown by the broken line in the figure,
Variations in the discharge path length for each anode 11 can be reduced.

For this reason, the starting voltage for each anode 11 is substantially equalized, and the lamp voltage for starting is also substantially equalized. Therefore, the brightness of each light emitting chamber 5 at the time of starting and at the time of lighting is also substantially equalized.

Further, the voltage applied between each anode 11 and cathode 7 is substantially equalized by the communication holes 43a and 43b of the shielding plate 42 and not by circuit elements such as current limiting resistors. It is possible to prevent complication and accompanying cost increase.

Further, since the shielding plate 42 is provided between the discharge hole 10 and the cathode 7, the red heat of the discharge spot of the cathode 7 and the discharge color of the surface of the cathode 7 are not seen from the translucent front plate 2. It can be hidden by the shielding plate 42.
For this reason, it is possible to reduce the dark luminance of the light emitting chamber 5 when it is not lit, and to improve the contrast with the light emitting chamber 5 that is lit.

Further, since the black stripes 19 are formed between the light emitting chambers 5, the black stripes 1 are formed.
9, the contrast between the light emitting chambers 5 can be improved.
Since the communication holes 43a and 43b of the shielding plate 42 that does not emit light can be concealed, the appearance can be improved.

FIG. 10 is a front view of a display fluorescent lamp 51 according to a fourth embodiment of the present invention. In this lamp 51, a discharge path in the light emitting chamber 5 near the cathode 7 is formed as an electrically insulating discharge path. A characteristic feature is that variation in the discharge path length between the anode 11 and the cathode 7 is reduced by forcibly meandering by the plate 52 and appropriately stretching.

That is, when one pixel constituted by the three light-emitting chambers R, G, and B is arranged in a square lattice, and the cathode 7 is arranged at a position corresponding to the center of the arrangement. With reference to the discharge path length of each light-emitting chamber 5a farthest from the cathode 7, the discharge path in the light-emitting chamber 5b having the anode 11 whose discharge path length is shorter than the light-emitting chamber 5a is forced by the discharge path forming plate 52. The length of the discharge path is adjusted so as to be approximately the same as the longest discharge path length.

The discharge path forming plate 52 is disposed opposite to the inner wall surface in the vicinity of each discharge hole 10 at a predetermined interval in the light emitting chamber 5 so as to be substantially parallel from one end of the discharge hole 10. A strip-shaped strip 52a and a hook-shaped strip 52b arranged at a predetermined distance from the free end of the straight strip 52a on the anode 11 side.

The straight, hook-shaped strips 52a, 52
By appropriately adjusting the length of 2b in accordance with the length of the discharge path for each anode 11, it is possible to make the length substantially coincide with the longest discharge path.

Therefore, the display fluorescent lamp 51 can also reduce the variation of the discharge path length of each anode 11, and reduce the variation of the starting voltage and the lamp voltage of each anode 11 to substantially equalize. Can be

In each of the above embodiments, the display fluorescent lamps of 8 pixels in 2 rows and 4 columns, 16 pixels in 2 rows and 8 columns, and 4 pixels in 2 rows and 2 columns have been described, but the present invention is not limited to this. However, for example, the number of pixels and the arrangement of the light-emitting chambers 5 can be appropriately selected.

[0076]

As described above, according to the first aspect of the present invention, each discharge generated between each anode and cathode is:
Since the hole passes through the communication hole of the shielding plate, the communication hole is provided at a position where the variation of the discharge path length between each anode and the cathode can be reduced as much as possible, so that the discharge path length for each anode is possible. It can be equalized as much as possible.

For this reason, it is possible to reduce the variation in the discharge voltage due to the variation in the discharge path length for each anode, and to equalize the brightness between the light emitting chambers at the time of lighting.

According to the second aspect of the present invention, the communication hole of the shielding plate is formed at a position where the variation of the discharge path length for each anode can be reduced. It has a function and effect.

According to the third aspect of the present invention, since the number of communication holes of the shielding plate is smaller than the number of discharge holes of the light emitting chamber, the communication of the shielding plate provided at a position where the discharge path length for each anode is equalized. The holes can be easily positioned, and the discharge path length for each anode can be easily equalized.

According to the fourth aspect of the present invention, since the communication holes of the shielding plate do not overlap with the discharge holes of the respective light emitting chambers, the discharge path length of each anode can be easily equalized.

According to the fifth aspect of the present invention, since the shielding plate is provided in the cathode chamber, the shielding plate conceals the red heat of the discharge spot of the cathode and the discharge color of the cathode surface as little as possible from the transparent front plate. can do. For this,
It is possible to reduce the dark luminance when the light-emitting room is not lit, and to improve the contrast with the light-emitting room being lit.

According to the sixth aspect of the invention, the contrast between the light emitting chambers can be improved by the light shielding portion, and the communication hole of the shielding plate that does not emit light can be concealed by the light shielding portion. The appearance can be improved.

According to the invention of claim 7, the discharge path length between each anode and cathode can be substantially equalized by appropriately adjusting the discharge path length in each light emitting chamber by the discharge path forming plate.

As a result, the discharge voltage for each anode can be substantially equalized, and the brightness between the light emitting chambers at the time of lighting can be equalized.

According to the eighth aspect of the present invention, since the discharge path forming plate is formed so that the discharge distance between each anode and cathode is equalized, the discharge path length is equalized according to desired conditions. It is possible to make adjustments.

[Brief description of the drawings]

FIG. 1 is a front view of a display fluorescent lamp according to a first embodiment of the present invention.

FIG. 2 is a schematic view showing a longitudinal section of FIG.

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a schematic view showing a longitudinal section of FIG. 3;

FIG. 5 is a front view of a display fluorescent lamp according to a second embodiment of the present invention.

FIG. 6 is a bottom view of FIG. 5;

FIG. 7 is a front view of a display fluorescent lamp according to a third embodiment of the present invention.

FIG. 8 is a schematic view showing a longitudinal section of FIG. 7;

FIG. 9 is a schematic diagram showing a side cross section of FIG. 7;

FIG. 10 is a front view of a display fluorescent lamp according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airtight container 2 Translucent front plate 3 Light emitting room part 4 Cathode room part 5 Light emitting room 7 Cathode 9 Bottom part 10 Discharge hole 11 Anode 13 Back plate 14 Side wall part 19 Black stripe (light shielding part) 20, 32, 42 Shielding plate 21a , 21b A pair of communication holes 31, 41, 51 Fluorescent lamp for display 52a Straight strip of discharge path forming plate 52b Hook-shaped strip of discharge path forming plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadashi Niizawa 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Lighting & Technology Corporation (72) Inventor Koichi Honda 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo No. Within Toshiba Lighting & Technology Corporation (72) Inventor Masaaki Kobayashi No. 1-36-36 Noritake Shinmachi, Nishi-ku, Nagoya City, Aichi Prefecture Inside Noritake Company Limited (72) Inventor Kengo Toda 3-1-1 Noritake Shinmachi, Nishi-ku, Nagoya City, Aichi Prefecture No. 36 Noritake Company Limited

Claims (8)

[Claims] 1. A light-transmitting front panel, a cathode chamber, and a plurality of light-emitting chambers disposed substantially flush with each other between the light-transmitting front panel and the cathode chamber and having a phosphor layer formed on an inner surface thereof. An airtight container in which a discharge hole communicating between the light emitting chamber and the cathode chamber is formed for each light emitting chamber; a discharge medium sealed in the airtight container; and a cathode disposed in the cathode chamber of the airtight container. A plurality of anodes disposed in a light emitting chamber of the hermetic container and forming a discharge path with the cathode; and a communication hole disposed between the discharge hole and the cathode and communicating the discharge hole with the cathode. And a shielding plate formed so as to correspond to the plurality of anodes. 2. The display fluorescent lamp according to claim 1, wherein the communication hole of the shielding plate is formed at a position where the variation of the discharge path length for each anode can be reduced. 3. The display fluorescent lamp according to claim 1, wherein the number of communication holes in the shielding plate is smaller than the number of discharge holes. 4. The communication hole according to claim 1, wherein the communication hole of the shielding plate is formed at a position that does not overlap in a vertical direction facing the discharge hole of each light emitting chamber. Display fluorescent lamp. 5. The display fluorescent lamp according to claim 1, wherein the shielding plate is provided in the cathode chamber. 6. A light-shielding portion is formed between at least adjacent light-emitting chambers of an airtight container, and a communication hole of a shield plate is provided on the back side of the light-shielding portion. The display fluorescent lamp according to any one of the above. 7. A light-transmitting front panel, a cathode chamber, and a plurality of light-emitting chambers disposed substantially flush between the light-transmitting front panel and the cathode chamber and having a phosphor layer formed on an inner surface thereof. An airtight container in which a discharge hole communicating between the light emitting chamber and the cathode chamber is formed for each light emitting chamber; a discharge medium sealed in the airtight container; and a cathode disposed in the cathode chamber of the airtight container. And a plurality of anodes disposed in the light emitting chamber of the hermetic container and forming a cathode and a discharge path; and a discharge path forming plate for adjusting the length of the discharge path in the light emitting chamber. For fluorescent lamp. 8. The discharge path forming plate according to claim 7, wherein the discharge path lengths in the respective light emitting chambers are equalized so that the respective discharge path lengths between the respective anodes and cathodes are equalized. Display fluorescent lamp.