JPS5951454A - Light source lamp - Google Patents

Abstract

PURPOSE:To expand formation of a luminous spot while preventing beams from being overlapped on a fluorescent screen by expanding both side beams toward the both sides of the radiation pitch direction, in case of an optical source lamp wherein the pitch of an electron radiating part is smaller than a phosphor pitch on a fluorescent screen part. CONSTITUTION:Electron beams from negative electrodes 31B-31R pass through the electrode holes 31a-32c of the first grid G32 on the upper surface of the X1 coordinate axis and the electrode holes 33a-1-33c-1 of the second grid G33 on the upper surface of the X2 coordinate axis, and are over-focussed by means of an electron lens constructed with the electrode holes 33a-2-33c-2 of the second grid G33 on the upper surface of the X3 coordinate axis and the electrode holes 34a-34c of the third grid G34 on the upper surface of the X4 coordinate axis, allowing an over-focussed longitudinally extending elliptical luminous spot to be formed on the fluorescent screen 2 on the upper surface of x5 coordinate axis. Assuming the pitch of each electron radiating part 6 from said negative electrodes 31B-31R to the surfaces of X1-X3 coordinate axes as S1, the rectangular electrode hole pitch on the upper surface of the X4 coordinate axis of the third grid G34 as S2, and the spot pitch on the fluorescent screen 2 as S, S1 shall be set larger than S2 so as to satisfy S>S1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light source tube, and more particularly, to a composite light source tube having the function of emitting red, green, and blue light with a single tube.

Recently, giant color displays have been used at baseball stadiums, soccer fields, and other baseball stadiums. These display elements are composed of a large number of light source tubes that emit red, green, and blue light, and are highly effective as giant color displays. However, the roughness of the picture elements on the display board poses an obstacle for outdoor advertising displays that can be viewed from a closer distance, biμ wall displays, etc., and it has not been possible to use them as short-range display elements.

On the other hand, in order to reduce the pixel pitch, a composite light source tube has been proposed in which one light source tube has the function of emitting red, green, and blue light. FIG. 1 shows an embodiment of a conventionally proposed composite light source tube. In the figure, a fluorescent surface (2) that emits red, green, and blue light is provided at the front end of the envelope (1) of the light source tube, divided into six parts.
Correspondingly, an electron gun (3) that generates an electron beam is disposed within the envelope (1), and a stem base portion (4) for applying voltage is provided at the rear of the envelope (1). ing.

FIG. 2 shows the light emitting state of the fluorescent surface (2) of the junction type light source tube shown in FIG. red, green.

Blue phosphors (2R), (2G1. (2B) are divided into columns and rows and painted, and each corresponds to an electron beam (5R).
, (5G).

(5B) collides with the fluorescent bodies (2R), (2G), (2B
) to emit light. As a result, the light source tubes shown in Figures 1 and 2 have a pixel pitch that is 1/6 or less compared to the pixel pitch of the conventional combination of red, green, and blue light source tubes, and the display element's eye The roughness can be sufficiently improved, and it can be used satisfactorily as a short-distance display element.

By the way, conventionally, as a monochromatic light source tube, the first grid, the second grid
A proposal has been made (Japanese Patent Application Laid-open No. 148340/1983) to overfocus the electron beam with the main lens using a six-electrode configuration of the grid and the sixth grid (Japanese Patent Application Laid-open No. 148340/1983). The second step is to make the light surface emit light. A constant voltage ratio is applied to the cylindrical electrodes of the sixth grid to form a cylindrical electrode lens.

FIG. 6 shows six monochromatic light source tube electron guns arranged in the first
The grid (G), the second grid (G), and the sixth grid are integrated electrodes, and the cathode is red.

(31R), (31G), (31
B] are arranged electrically independently. This electron gun, for example, about 8 to 10
KV, second grid ■ 707, fluorescent surface potential 8-10
When set to mushroom and driven, the fluorescent surface (2) is red.

Diffused electron beams (5R) and (5G) correspond to green and blue.
).

(5B) can be formed.

By the way, considering the light emitting state of the fluorescent surface (2) shown in FIG. 4, it is generally desirable to use a circular shape for the envelope (1) of the light source tube from the standpoint of mass production, cost, and technology.

For example, if the coated outer diameter of the phosphor surface (2) shown in Fig. 4 is 28.6-IIφ, red, green, and blue phosphors (
2R), (2G), and (2B), that is, the phosphor pitch S must be selected to be about 91 m. Therefore, the electron beam (5R
>.

The pitch S of (5G) and (5B) also needs to be the same. In addition, each phosphor (2R), (2G), (2B/
) It is necessary to determine the phosphor arrangement of the light source tube and the phosphor surface emitting area ratio, taking into account the luminance ratio of .

Conventionally, no specific method has been proposed for making such a phosphor pitch and phosphor arrangement stand out.

In particular, if the diffused electron beams (5R), (5G), and (5B) are emitted in accordance with the phosphor pitch as shown in FIG. in the case of,
The phosphor pitch S is about 9 m, and the pitch of the electron emitting part (6) shown in FIG. 6 needs to be about 9 square meters. On the electrode structure of the second grid - electron emitting part (6)
Since the pitch of the electron beam is only about 6.6 days, the red electron beam (5
R) and the green electron beam (5G) or the blue electron beam (5B) and the green electron beam (5G) inevitably overlap, resulting in other colors being emitted. On the other hand, the i-light surface (
2) If it is attempted to prevent the electron beams from overlapping each other on the fluorescent surface, the light emission spot on the fluorescent surface must be made smaller, and the light emission brightness decreases.

Therefore, the present invention provides a means for forming a large luminous spot without causing the electron beams to overlap each other on the fluorescent surface in a light source tube in which the pitch of the electron emitting portion is smaller than the pitch of the phosphors in the fluorescent surface portion. .

FIG. 5 shows a diagram of the basic principle of this invention.

In FIG. 5, six electrically independent cathodes (31
n3, (31G), (31R) and each cathode (3
1B), (31G), and (61R), an electrode configuration consisting of a first grid (b), a second grid (2), and a sixth grid is shown, and at least the second grid is constructed as an integral structure. This second grid ■ has the first grid -
〇Six electrode holes (33&1), (33b-1) corresponding to six electrode holes (32a), (32b), (32o)
, (33o-1) and the third grid electrically connected to the fluorescent surface potential).
square or similar shape electrode hole (34a
), (34b), (34o)c corresponding six rectangular or similar electrode holes (55a-2), (
33b-2) and (55a-2) are provided.

In the above configuration, cathodes (31B), (31G), (3
The electron beam emitted from #1R) is sent to the electrode hole (32a) # (32b) in the first grid on the top surface of the axis.
+ (32Q)s 2nd grid on the top surface of
), and the electrode hole (33
a-2), (33b-2), (33a-2) and the electrode hole (34a) of the sixth grid on the top surface of the x4 axis, (
34b) and (54a), respectively, to form vertically elongated elliptical overfocused light emitting spots on the fluorescent surface (2) located on the upper surface of the Xs axis.

"1" from cathode (31B), (61()), (31R)
m "Axes of each electron emitting part (6) up to Rs XI axis plane"
#'Q 121 pitch 81 6th grid x4
It was found that when the rectangular electrode hole pitch on the axial surface is S chamber and the luminescent spot pitch on the fluorescent surface (2) is 8, in order for S > S, it is necessary to make st > s2. .

For example, the outer diameter of the fluorescent surface (2) is 28.6-mφ, s=9
■, if Sl = 6.6 ym, St,': 6.3
ym rt;-M constant 15 good results are obtained. Furthermore, on the fluorescent surface (2) of the Xs axis,
When the axis length is DX and the y-axis length is D7, the value of Dy/Dx of the green electron beam (5G) should be different from that of the red and blue electron beams (5R) and (5B). It is.

For example, as shown in Figure 6, the central electron beam (5
The X-axis diameter of the light emitting spot in G) is Do, and the X-axis diameter is Do7.
-Hold the side electron beams (5R) and (5B).

When Dy is tE, Doy/Dox) D7/DX
It is necessary to do so.

For example, if the outer diameter of the fluorescent surface coating part is 28.6 wmφ,
A good light emitting spot can be obtained by setting it to 6.5 in D67/D6X and 2.4 in Dy/Dx. This Iby/I)
The ratio of ox and Dy/px cannot be set to exact values because of the diffuse spot. Therefore, the ratio of the major axis to the minor axis of the luminescent spot is Do7/DoX:l:3~4-D7/
It is preferable to set DI=2 to 3. This needs to be determined by also considering the luminance ratio of red, green, and blue.

As mentioned above, in order to make the emission spot shapes of the central electron beam (5G) and the side electron beams (5B) and (5R) different, as shown in Fig. 5,
The rectangular electrode hole shape on the axial surface is connected to the central electrode hole (33b-2”
) and electrode holes on both sides (33a-2), (33Q 2)
It is necessary to differentiate between

FIG. 7 shows the Z, -Z, -Z cross sections of one embodiment of the present invention, and the rectangular electrode hole pitch S of the second grid
1 to 6.6■, 3rd grid square electrode hole pitch 8
．． The side electron beams (5B) and (5R1) are spread on both sides in the direction of the electron emitting part pitch s1, and a good light emission with a pitch S of 9cm is placed on the fluorescent surface (2). It causes spots to form.Of course, red, green,
The blue phosphor pitch is 9-11.

As can be seen from the above description, according to the present invention, in a light source tube where the pitch of the electron emitting parts is smaller than the phosphor pitch of the fluorescent surface part, both side beams are spread to both sides in the pitch direction of the electron emitting parts. This prevents the electron beams from overlapping each other on the fluorescent surface, and has the effect of forming a large light-emitting spot.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of a conventional composite light source tube, Figure 2 is a diagram of the light emission state of the composite light source tube shown in Figure 1, and Figure 6 is an explanatory diagram of the electron gun and diffused beam of the conventional composite light source tube. , FIG. 4 is an explanatory diagram of a fluorescent surface, FIG. 5 is a diagram of the basic principle of this invention, FIG. 6 is an explanatory diagram of a luminescent spot, and FIG. 7 is a schematic configuration diagram showing an embodiment of this invention. . (2)...Fluorescent surface, (8)...Electron gun, (31]3
), (31G), (31R1... cathode, )... 1st grid, -... 2nd grid, -... 6th grid, (32a), (32N, (32o)...・First
Grid electrode hole, (33m-1), (33b 1), (
33o-1) and (33m-2), (Z, 3b-
2), C55o-2) -- second grid electrode hole,
(34m), (34b), (34o)...Sixth grid electrode hole. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno (1 other person)

Claims (2)

[Claims] (1) Six electrically independent cathodes, each consisting of a first grid, a second grid, and a sixth grid.
and an electrode configuration, in which at least the second grid is an integral structure, and six electrode holes corresponding to the six electrode holes of the first grid are electrically connected to the phosphor surface potential. six square or similar electrode holes provided in the second grid opposing portion of the sixth grid; The hole pitch of the holes is 6th.
A light source tube with an electron gun larger than that of the grid's electrode holes. (2) The luminescent spot shape for the center and both sides of the 6-divided fluorescent surface is such that the ratio of the major axis to minor axis of the luminescent spot for the center is 6 to 4, and that of the luminescent spot for both sides is 2-6. A light source tube according to claim 1, which is set as follows.