JP3248041B2 - Image forming apparatus and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as a display apparatus and a recording apparatus to which an electron source is applied, and more particularly, to a thin image forming apparatus having a spacer (support) therein and a method of manufacturing the same. It is about.

[0002]

2. Description of the Related Art Conventionally, two types of electron sources, a thermionic electron source and a cold cathode electron source, are known. The cold cathode electron source includes a field emission type (hereinafter, referred to as “FE”), a metal / insulating layer / metal type (hereinafter, referred to as “MIM”), and a surface conduction electron emission type (hereinafter, “SCE”). Etc.).

[0003] As an example of the FE type, W. P. Dyke
& W. W. Dolan, "Feeid emissi
on ", Advance in Electron P
physics, 8, 89 (1956), C.I. A. Sp
indt, “Physical properties
ofthin-film field emissi
on cathodes with mollybden
um cones ", J. Appl. Phys., 4
7, 5248 (1976).

As an example of the MIM type, C.I. A. Mea
d, "The tunnel-emission am
prifier ", J. Appl. Phys., 32,
646 (1961).

As an example of the SCE type, E. I. Elin
son, Radio Eng. Electron Ph
ys. , 10, 1290 (1965).

[0006] The SCE type utilizes a phenomenon in which electron emission occurs when a current flows in a small-area thin film formed on a substrate in parallel with the film surface.

As the SCE type device, a device using an SnO ₂ thin film by Elinson et al. Dittmer: "Thin Solid
Films ", 9,317 (1972)] , In 2 O 3
/ SnO ₂ thin film [M. Hartwell a
nd C.I. G. FIG. Fonstad: “IEEE Tran
s. ED conf. , 519, (1975)], and those using a carbon thin film [Hisashi Araki: Vacuum, Vol. 26, No. 1, p. 22, p. 22 (1983)] and the like have been reported.

The above-mentioned electron-emitting device is 10 ⁻⁶ To.
Since the device is operated in a vacuum of about rr or more, when an image forming apparatus is formed using electron-emitting devices, an atmospheric pressure-resistant structure as a vacuum container is required. In a thin planar image forming apparatus, a large number of columns are arranged between a back plate on which electron-emitting devices and the like are mounted and a front plate on which a phosphor as an image forming member and a surrounding member surrounding the phosphor are mounted, and these are supported by a support frame. At the same time, it is hermetically bonded with a low melting glass for hermetic bonding to form an atmospheric pressure resistant structure. At this time, the column is positioned so as to overlap with the surrounding member so as not to affect the image unevenness.

[0009] The surrounding member is, for example, for the purpose of making the color mixing and the like inconspicuous by blacking out the portions of the three primary color phosphors required for color display between the phosphors.
Depending on the arrangement of the phosphors, a black conductive material called a black stripe or a black matrix is used.
As this material, not only a material mainly containing graphite, which is often used, but also a material having conductivity and low transmission and reflection of light is used.

[0010]

However, in the above prior art, the glass front plate on which the enclosing member formed by the printing technique or the like is mounted is distorted by heat in the manufacturing process, and the enclosing member or the like is not used. Is distorted. For this reason, when installing a support | pillar in an image forming apparatus, it is difficult to position it so that many support | pillars may overlap with a surrounding member so that it may not protrude on image forming members, such as a fluorescent substance. Particularly in a large-area image display device, the amount of distortion of the surrounding member is large,
For example, when a flat support is used, its positioning is very difficult.

For this reason, as shown in FIG. 6, the light-shielding portion 7 such as a column is likely to be displaced on the phosphor 4 side, and there is a portion 8 in the phosphor 4 which does not emit light. Was easy to occur.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide an image forming apparatus capable of eliminating a position shift of a support and an image defect caused by the support protruding from an image forming member, and a method of manufacturing the same. And

[0013]

In order to achieve the above object, the present invention provides a back plate on which an electron-emitting device is mounted, and an image forming member on which an image is formed by irradiation of an electron beam emitted from the electron-emitting device. An image forming apparatus having a front plate mounted with an enclosing member surrounding the image forming member and opposed to the back plate, and a post disposed between the front plate and the back plate, for positioning the post. An image forming apparatus is provided, wherein a positioning member is formed on the surrounding member.

The present invention also provides that the positioning member has a structure that fits with the column, the fitting structure has two convex shapes arranged substantially in parallel, and the positioning member has The striking structure has a structure, the striking structure has a convex shape, the surrounding member is a black stripe or a black matrix, the strut is a flat plate shape, The electron-emitting device is a surface conduction electron-emitting device.

Further, the present invention includes a method of manufacturing the image forming apparatus, wherein the positioning member is formed using a printing technique, and the positioning member is formed using a dispenser.

[0016]

The present invention will be described below with reference to examples.

FIG. 1 is a cross-sectional perspective view of an image forming apparatus according to the present embodiment, in which the respective members are separated from each other. In FIG. 1, reference numeral 1 denotes a support having a flat plate shape obtained by polishing a soda lime glass, reference numerals 2a and 2b denote positioning members for positioning the support 1, reference numeral 4 denotes a phosphor which is an image forming member, and reference numeral 3 denotes an enclosure surrounding the phosphor 4. A black matrix, which is a member, 5 is a front plate made of blue plate glass on which a black matrix 3 and a phosphor 4 are mounted, and 6 is an electron-emitting device (not shown).
It is a back plate made of soda lime glass on which a glass plate is mounted. In addition, a surface conduction electron-emitting device was prepared as an electron-emitting device by a method disclosed in, for example, JP-A-2-56822 and JP-A-4-28139.

The positioning members 2a and 2b have convex shapes arranged substantially in parallel, and are provided in a range not protruding above the phosphor 4. These positioning members 2a, 2b
When the black matrix 3 is manufactured by a printing technique, the same material as the black matrix 3 is stacked by a printing technique on a black stripe in one direction constituting the black matrix 3 before a firing step in which thermal distortion occurs. Produced. By doing so, the positioning members 2a and 2b can be regarded as integral with the black matrix 3, and they are deformed together even if thermal strain or the like occurs. Note that the distance between the positioning members 2a and 2b is a dimension that fits with the width of the column 1.

In the assembling procedure, first, as shown in FIG. 2, the column 1 is fitted and positioned between the positioning members 2a and 2b.
Low-melting glass was used for fixing the column 1. Next, pillar 1
The front plate 5 and the back plate 6 to which are fixed are arranged with a support frame (not shown) interposed therebetween so that the phosphor 4 and the electron-emitting device are opposed to each other, thereby producing a closed container. A low-melting glass was applied to each joint and fired for sealing. Then, the interior of the container is evacuated to perform electric wiring and the like, and an image forming apparatus is completed.

FIG. 3 is an enlarged view of the completed image forming apparatus as viewed from the front plate side. 7 is a column 1 and a positioning member 2
The light-shielding portions 7a and 2b overlap the black matrix 3 and do not protrude toward the phosphor 4 side.

In the present embodiment, the support column 1 is positioned between the positioning members 2a and 2b on the black matrix 3 so that the support column 1 is positioned without protruding from the black stripe 3. The image defect due to the protrusion of the support 1 was eliminated.

In addition, even when assembling a large-area image forming apparatus in which the amount of distortion of the surrounding member is large, the columns can be similarly positioned, and the same effect as above can be obtained.

[Embodiment 2] FIG. 4 is a sectional perspective view of an image forming apparatus according to the present embodiment, in which each member is shown in a separated state. In the same figure, the members denoted by the same reference numerals as those in FIG. 1 represent equivalent members, and 2 is a positioning member for positioning the column 1.

In this embodiment, a surface conduction electron-emitting device was formed on the back plate 6 as an electron-emitting device in the same manner as in the first embodiment.

The positioning member 2 has a convex shape and is provided so as not to protrude from the phosphor 4. When the black matrix 3 is manufactured by a printing technique, the positioning member 2 is manufactured by stacking a low-melting glass (frit glass) on the black matrix 3 using a dispenser robot before a firing step in which thermal distortion occurs.

More specifically, a dispenser robot that discharges a paste-like frit glass mixture obtained by mixing frit glass powder with a binder, an organic solvent, or the like to a designated position with a needle is used. Industrially widely used as a coating device for various paste-like substances).

By forming the positioning member 2 on the black matrix 3 in this manner, the positioning member 2 can be regarded as integral with the black matrix 3, and they are deformed together even if thermal strain occurs.

The assembling procedure is as follows. First, as shown in FIG. Low-melting glass was used for fixing the column 1. Hereinafter, an image forming apparatus was manufactured in the same manner as in Example 1. In this embodiment, as in FIG. 3 of the first embodiment, the light-shielding portion composed of the column 1 and the positioning member 2 overlaps the black matrix 3 and does not protrude to the phosphor 4 side.

In the present embodiment, the support 1 is positioned so as not to protrude from the black matrix 3 by striking the support 1 against the positioning member 2 on the black matrix 3. The image defect due to the protrusion of 1 was eliminated.

The shape and arrangement of the positioning member according to the present invention are not limited to the embodiments described above.
It can be changed according to the shape and arrangement of the columns. Furthermore,
An example in which the SCE type is used as the electron-emitting device has been described.
E type, MIM type and the like can also be applied.

[0031]

As described above, by providing the positioning member for positioning the support on the surrounding member such as the black matrix surrounding the image forming member, the positioning can be performed without protruding the support on the image forming member. The image defect due to the pillar protruding into the image forming area was eliminated.

As a result, a highly reliable flat type image forming apparatus can be obtained, and it has a great effect particularly in manufacturing a large area flat type image forming apparatus.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of an image forming apparatus according to the present invention shown in a first embodiment.

FIG. 2 is a cross-sectional view showing positioning of a support by the positioning member of FIG.

FIG. 3 is a diagram showing a positional relationship between a surrounding member and a light shielding unit.

FIG. 4 is a sectional perspective view of the image forming apparatus of the present invention shown in Embodiment 2.

FIG. 5 is a cross-sectional view illustrating positioning of a support column by the positioning member of FIG. 4;

FIG. 6 is a diagram showing a positional relationship between a surrounding member and a light shielding portion in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Prop 2, 2a, 2b Positioning member 3 Black matrix 4 Phosphor 5 Front plate 6 Back plate 7 Shielding part 8 Non-lighted part in phosphor

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-141571 (JP, A) JP-A-3-49135 (JP, A) JP-A-63-284743 (JP, A) JP-A-59-1984 114734 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01J 29/87 H01J 1/30-1/316 H01J 31/12

Claims (10)

(57) [Claims] A back plate on which an electron-emitting device is mounted; an image forming member on which an image is formed by irradiation of an electron beam emitted from the electron-emitting device; and a surrounding member surrounding the image forming member. In an image forming apparatus having a front plate opposed to a face plate and a support disposed between the front plate and the back plate, a positioning member for positioning the support is formed on the surrounding member. An image forming apparatus comprising: 2. The image forming apparatus according to claim 1, wherein the positioning member has a structure that fits into the support. 3. The image forming apparatus according to claim 2, wherein the fitting structure has two convex shapes arranged substantially in parallel. 4. The image forming apparatus according to claim 1, wherein the positioning member has a structure for abutting the support. 5. The image forming apparatus according to claim 4, wherein the striking structure has a convex shape. 6. The method according to claim 1, wherein the surrounding member is a black stripe or a black matrix.
6. The image forming apparatus according to any one of claims 1 to 5, 7. The image forming apparatus according to claim 1, wherein the support has a flat plate shape. 8. The image forming apparatus according to claim 1, wherein said electron-emitting device is a surface conduction electron-emitting device. 9. A method for manufacturing an image forming apparatus according to claim 1, wherein said positioning member is formed by using a printing technique when manufacturing the image forming apparatus according to claim 1. 10. A method for manufacturing an image forming apparatus according to claim 1, wherein said positioning member is formed using a dispenser when manufacturing the image forming apparatus according to claim 1.