JP3210215B2 - Positioning jig for image forming apparatus and method for positioning image forming apparatus using the positioning jig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning jig for a flat image forming apparatus using an electron source, and more particularly to a positioning jig for a thin image forming apparatus having a spacer inside a vacuum vessel and the positioning jig. The present invention relates to a method for positioning an image forming apparatus.

[0002]

2. Description of the Related Art In recent years, a liquid crystal display (Liquid Crystal Display) has been used as a light and thin so-called flat display as an image forming apparatus replacing large and heavy cathode ray tubes.
However, there are still problems such as dark images and narrow viewing angles in liquid crystal display devices. As a substitute for the liquid crystal display device, there is a self-luminous type flat display that forms an image by irradiating a phosphor with an electron beam emitted from an electron source to generate fluorescent light. A self-luminous flat display using an electron source can obtain a brighter image and has a wider viewing angle than a liquid crystal display device. However, in a flat display using an electron source, an electron source, a phosphor, and other materials are placed in a vacuum vessel having a vacuum atmosphere of about 10 ⁻⁵ torr or less because an image is formed by irradiating the phosphor with an electron beam. The components must be built in, and the vacuum vessel must have an atmospheric pressure resistant structure.

A vacuum vessel having an atmospheric pressure resistant structure includes a face plate having a phosphor which emits light by emitting electrons emitted from the electron-emitting device, a rear plate having the electron-emitting device, and a rear plate having the electron-emitting device. There is a configuration in which a spacer is provided between them. Actual opening 5
JP-A-8-107554 discloses a cover glass in which a spacer is provided between a front glass substrate and an anode substrate as a vacuum vessel for a fluorescent display tube, and these are adhered using frit glass. FIG. 11 is an exploded perspective view of a fluorescent display tube using a cover glass disclosed in the above publication. In the figure, reference numeral 1101 denotes a front glass substrate, 1102 denotes a spacer, 1110 denotes an anode substrate, 112
Reference numeral 0 denotes a light emitting anode portion, 1121 denotes a control grid, 1122 denotes a filament wire, 1123 denotes an exhaust pipe, 1124 denotes an exhaust pipe hole, 1125 and 1126 denote frit glass.
A spacer 1102 is provided between the front glass substrate 1101 and the anode substrate 1110, and these are placed on the frit glass 11
25, 1126 to form a cover glass as a vacuum container. The light emitting anode unit 1120, the control grid 1121, and the filament wire 1122 serving as an electron beam generating source are formed inside the cover glass. The inside of the cover glass is evacuated and evacuated by the exhaust pipe 1123 and the exhaust pipe hole 1124. In the fluorescent display tube of this figure, the light emitting anodes 1120 are not arranged in a matrix, but are arranged only in one column. Absent.

[0004] As a method of obtaining the atmospheric pressure resistant structure, either of the methods of increasing the thickness of the face plate and the rear plate, or providing an atmospheric pressure resistant spacer as an auxiliary member inside the image forming apparatus can be considered. . When a large-area image forming apparatus is considered, it is desirable to provide an anti-atmospheric pressure spacer inside the image forming apparatus from the viewpoint of reducing the weight of the image forming apparatus. An example in which a flat atmospheric pressure-resistant spacer is provided inside an image forming apparatus is disclosed in JP-A-5-3636.
No. 3 discloses a technique disclosed in Japanese Patent Laid-Open Publication No. Hei. The above-mentioned publication discloses that a fixing jig is required when assembling the flat atmospheric pressure-resistant spacer to the face plate, and that the positional accuracy with the face plate is important in assembling. However, no specific means for solving these problems is described.

[0005]

When a plurality of spacers are simultaneously positioned in a row direction and a column direction at predetermined intervals on a face plate or a rear plate and assembled at the same time, the following forms are considered as an assembling jig. Prepare a plate,
A hole for inserting the spacer is formed at a position corresponding to a position where the spacer on the face plate or the rear plate stands on the flat plate at right angles to the main surface of the flat plate to form an assembling jig. At the time of assembly, a spacer is inserted into a hole of the assembly jig, and the assembly jig and the face plate are positioned.

There are the following problems in the assembling jig and the method of assembling the image forming apparatus using the assembling jig. A case where a spacer is assembled on the black stripe of the face plate by using the above-mentioned assembling jig will be described.

Although a plurality of black stripes are formed in parallel with the face plate, the spacing between adjacent black stripes has an error within a certain range with respect to the reference dimension due to processing accuracy.

The thickness of the spacer is preferably as large as possible to maintain atmospheric pressure resistance. However, if the width is larger than the width of the black stripe, the aperture ratio and the like are partially reduced. Therefore, a thickness smaller than the width of the black stripe is preferable in terms of image quality.

Even if the width of the spacer is made substantially equal to the width of the black stripe and the spacer is correctly positioned at a predetermined position by an assembling jig, the distance between the black stripes has an error with respect to the reference dimension. In some cases, the spacer may protrude from the black stripe. It should be noted that the displacement of the spacer in the longitudinal direction of the black stripe has no relation to the obstruction of the flow of electrons, so that precise alignment is not required.

[0010] Even if the spacers are positioned on the face plate or the rear plate with high precision, since they are joined at a high temperature of 410 ° C, they are affected by the displacement due to thermal expansion. There is a need to do.

An object of the present invention is to provide a positioning jig for precisely assembling a spacer at a predetermined position when assembling a spacer on a face plate or a rear plate of a flat image forming apparatus using an electron source with a heating step. It is an object of the present invention to provide a method of positioning an image forming apparatus using the positioning jig.

[0012]

SUMMARY OF THE INVENTION A positioning jig for an image forming apparatus according to the present invention is used for precisely joining a spacer to a predetermined position on a face plate or a rear plate of a flat image forming apparatus using an electron source. A positioning jig, comprising: an assembly jig for holding a spacer at a predetermined position; and an assembly table for aligning a face plate or a rear plate to be joined with the assembly jig. Is constituted by a parallel combination of a plurality of strip-shaped splitters, and a spacer can be inserted into one longitudinal end face of the strip-shaped splitter in combination with another longitudinal end face of an adjacent strip-shaped splitter. A notch in which a hole is formed is provided at a predetermined position, and the width of the strip-shaped split plate in the short direction is substantially the same as the predetermined interval of the spacer. Therefore, by preparing the strip-shaped divided plates having a plurality of widths in the transverse direction corresponding to the expected variation width of the spacer interval, it is possible to easily assemble the spacers at intervals that match the predetermined intervals of the spacers. it can.

The material of the strip-shaped split plate may be a material having a thermal expansion coefficient substantially equal to that of the face plate or the rear plate to be joined. Even when a heating step is involved in the assembly, the spacer moves in proportion to the expansion of the face plate or the rear plate, and the positioned position does not change.

Further, a member having a coefficient of thermal expansion larger than the coefficient of thermal expansion of the strip-shaped split plate may be attached to a portion of the notch portion in contact with the longitudinal surface of the spacer. When the assembling involves a heating step, the expansion of the assembled member is larger than that of the strip-shaped split plate, and the play in the width direction of the spacer and the figure hole is reduced.

The method for positioning an image forming apparatus using a positioning jig according to the present invention is a method for positioning an image forming apparatus using a positioning jig as described above, wherein a spacer is inserted into a hole formed by a notch of an assembly jig. Then, the assembling jig and the face plate or the rear plate to be joined are positioned and fixed on an assembly table, and the spacer is joined to the face plate or the rear plate to be joined.

In the positioning jig of the present invention configured as described above, an assembling jig having a strip-shaped split plate provided with a cutout portion in which a hole into which a spacer can be inserted is formed is joined by an assembling table. Since the alignment is performed with the target face plate or the rear plate, the alignment between the spacer and the face plate or the rear plate as the bonding target can be easily and accurately performed.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be widely applied to the application of a plurality of additional members to a plate-like member precisely at a predetermined position in assembling a precision member with a heating step. A positioning jig and a positioning method for vertically frit-joining a spacer serving as a pillar to a predetermined position on a plate surface of a natural blue glass sheet will be specifically described.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a positioning jig according to a first embodiment of the present invention, FIG. 2 is a schematic perspective view before assembling a face plate and a spacer to be assembled, and FIG. 3 is a jig. FIG. 4 is a schematic perspective view of a divided body constituting an assembly jig of the present invention after assembly of a face plate and a spacer to be assembled, and FIG. 5 is an assembly jig configured according to a black stripe. Schematic perspective view of the tool,
FIG. 6 is a schematic perspective view after all the spacers have been inserted into the assembly jig.

In the drawing, reference numeral 1 denotes a face plate to be assembled, 1a denotes a black stripe marked at a spacer mounting position on the face plate 1, 1b denotes a frit glass as an adhesive, 2 denotes a spacer to be mounted on the face plate, 3 Is an assembly jig, 4 is a notched divided body constituting the assembly jig 3, 4a is a cutout portion of the notched divided body 4,
b is a long side of the divided body, 4c is a short side of the divided body, 4d is a figure hole for holding the spacer 2, 5 is a non-notched divided body constituting the assembling jig 3, 6 is an assembling table, 6a, 6b, 6c , A first abutting portion, a second abutting portion, and a horizontal portion of the assembling table 6; 7, a spring reaction force receiving block attached to the assembling table 6; The plate 1 and the assembling jig 3 are connected to the first butting portion 6a,
This is a ceramic spring for bringing the second abutting portion 6b into close contact.

The purpose of this assembling operation is as shown in FIGS.
The spacer 2 is vertically attached exactly at the position marked with the mark, and the width of the black stripe 1a is wider than the thickness t of the spacer 2, and the frit glass 1b of the adhesive is applied within the width of the black stripe 1a. The spacer 2 is arranged at the correct position above and heated at a high temperature of 410 ° C. to perform the bonding.

In this case, the position of the spacer 2 in the Y direction in FIG. 1 needs to be adhered to an accurate position on the black stripe 1a, so that a high precision is required. No precision is needed because it has nothing to do with obstruction.

As shown in FIG. 2, the intervals between the three black stripes 1a are A, A1, and A2 with respect to the end face of the face plate 1. A, A1, and A2 are processed such that the reference dimensions are set to 10 mm and the error is within ± 0.1 mm. Black stripe 1
The width of a is 0.3 mm. The frit glass 1b is formed on the black stripe 1a in advance.
The thickness t of the spacer 2 is 0.2 mm, and the length b of the long side is 40.
mm and the height h are 4 mm.

Next, a divided body constituting the assembly jig of the present invention will be described with reference to FIGS. A cutout portion 4a is formed in the cutout divided body 4, and the depth t1 of the cutout portion 4a is larger than the thickness t of the spacer 2 by 0.01 mm and 0.21 mm.
It is. The length b1 of the long side of the notch 4a is 0.1 mm larger than the length b of the long side of the spacer 2 and is 40.1 mm.
The thickness h1 of the cutout divided body 4 is 1 more than the height h of the spacer 2.
mm and 3 mm. The notched long side 4b of the notched divided body 4 or the not-divided divided body 5 which is adjacent to each other
The notch 4a forms a figure hole 4d for holding the spacer 2. The shape hole is a hole having a cross section similar to the cross section of the spacer 2 and having an appropriate clearance from the spacer 2. The length c of the short side 4c of the cutout divided body 4 is the distance A, A1, between the black stripes 1a of the face plate 1.
A2 is supported. As described above, since A, A1, and A2 are formed with an accuracy of 10 mm ± 0.1 mm, the length c of the short side 4c of the cutout divided body 4 is +0.
0.01 mm increments to 10.1 mm, 10 mm minus -0.1 mm.
If 1.9 mm is prepared in increments of 01 mm, the jigs 3 are selected at the intervals of 0.01 mm accuracy by selecting them based on the measured values of A, A1, and A2 and combining them with the non-notched divided body 5. Can be configured. As shown in FIG. 5, the spacer 2 can be inserted and held in the figure hole 4d of the assembly jig 3. The divided body is made of the same soda lime glass as the face plate 1 or another material having the same thermal expansion coefficient as the soda lime glass.

Next, the positioning and joining of the face plate 1 and the spacer 2 will be described with reference to FIG. The positioning jig is composed of an assembling jig 3 and an assembling table 6. The metal (stainless steel) assembling table 6 has a horizontal portion 6 c for fixing the face plate 1 and the assembling jig 3 and a vertical portion to the horizontal portion 6 c. The first abutting portion 6a, the second abutting portion 6b, the face plate 1 and the assembling jig 3 on the two orthogonal surfaces which are upright and serve as positioning reference surfaces are attached to the first abutting portion 6.
a, a spring reaction force receiving block 7 is provided as a fulcrum for bringing the second abutting portion 6b into close contact with a heat-resistant ceramic spring 8.

The assembling jig 3 having the spacer 2 inserted and held in the figure hole 4d is placed on the horizontal portion 6c of the assembling table 6, and the end face serving as the reference surface of the assembling jig 3 is brought into the first butting portion of the assembling table 6. The ceramic spring 8 supported by the spring reaction force receiving block 7 of the assembly stand 6 is pressed against the 6a and the second butting portion 6b. The face plate 1 on which the black stripe 1a is marked and the frit glass 1b is applied at a predetermined position is placed with the black stripe surface facing down, and the end surface serving as the reference surface of the face plate 1 is placed on the first surface of the assembly table 6. The spacer 2 is coated with the frit glass 1b of the face plate 1 by pressing the abutting portion 6a and the second abutting portion 6b with the ceramic spring 8 supported by the spring reaction force receiving block 7 of the assembly table 6. Then, it comes into contact with the predetermined position and is positioned and fixed.

The positioning jig having the face plate 1 and the assembling jig 3 fixed to the assembling table 6 is placed in a firing furnace and heated. During heating, all members undergo thermal expansion. However, no matter how the assembling table 6 expands, the face plate 1 and the assembling jig 3 maintain the first butting portion 6a and the second butting portion 6a.
The reference position does not shift since it is pressed against b by the ceramic spring 8. The material of the assembling jig 3 is made of the same blue plate glass as that of the face plate 1 or the same thermal expansion coefficient as that of the face plate 1. Therefore, even if the temperature rises, the assembling jig 3 and the face plate 1 are heated. No displacement due to expansion.

By heating to 410 ° C., the frit glass 1b is melted, and the face plate 1 and the spacer 2 are joined by subsequent cooling.

FIGS. 7 and 8 show a second embodiment of the present invention. FIG. 7 is a schematic perspective view of a divided body constituting the assembly jig of the present invention, and FIG. 8 is a schematic perspective view of an assembly jig configured according to a black stripe. In the drawing, reference numeral 74 denotes a notched divided body constituting the assembly jig 73, and 74a denotes a notched divided body 7.
4 is a cutout, 74d is a figure hole for holding the spacer 72, 7d.
Reference numeral 5 denotes a non-notched divided body constituting the assembly jig 73, and 79 denotes a stainless steel plate.

In the first embodiment of the present invention, the depth t1 of the cutout portion 4a of the cutout divided body 4 is set to 0.21 mm, which is 0.01 mm larger than the thickness t of the spacer 2. Therefore, a play of 0.01 mm is generated between the spacer 2 and the thickness of the spacer 2, and the accuracy of the spacer 2 is degraded by an inclination of 0.01 mm. However, if there is no play of 0.01 mm, it is difficult to insert the spacer 72 into the figure hole 74d. Therefore, the depth t1 of the cutout portion 74a of the cutout divided body 74 is set to 1.21 mm, and a stainless plate 79 having a short side s of 1 mm is inserted into the cutout portion 74a. In this way, at room temperature, the pressure is 0.1 mm.
Since there is a play of 01 mm, the spacer 72 is inserted into the hole 74 d.
It is easy to insert into. When these are heated to 410 ° C., the thermal expansion coefficient of the soda lime glass is 80 × 10 ⁻⁷ and the thermal expansion coefficient of the stainless steel plate is 200 × 10 ^−7, so that (200−80) × 10 ⁻⁷ × 1 mm × (410 ° C.) -20
° C) = 0.005 mm, and the play of 0.005 mm is reduced. Backlash which was 0.01mm at room temperature 20 ° C is 0.01mm at 410 ° C
−0.005 mm = 0.005 mm, and the accuracy of joining the spacer 72 to the face plate 1 is further improved.

Next, an image forming apparatus to which the positioning jig and the positioning method of the present invention are applied will be described with reference to the drawings. FIG. 9A is a schematic cross-sectional view illustrating an example of an image forming apparatus to which the positioning jig and the positioning method of the present invention are applied, and FIG. 9B is a schematic cross-sectional view illustrating an enlarged side wall of the image forming apparatus. FIG. 10A is a schematic plan view of the surface conduction electron-emitting device, and FIG. 10B is a schematic cross-sectional view of the surface conduction electron-emitting device.

In the figure, 901 is a face plate, 902 is a spacer, 910 is a rear plate, 911 is a support frame, 9
12 is an adhesive member, 913 is an electron-emitting device group such as a surface conduction electron-emitting device, 914 is an image forming member, 915 is a wiring take-out portion, 1010 is a substrate, 1016 and 1017 are device electrodes, 1018 is a conductive thin film, and 1019. Denotes an electron emission portion.

The face plate 901 is connected to the image forming member 9.
14, and the rear plate 910 has an electron-emitting device group 913 mounted thereon. The face plate 901 and the rear plate 910 are hermetically joined using a support frame 911 to form an airtight container. Face plate 901
A spacer 902 as an atmospheric pressure support member is inserted between the rear plate 910 and the rear plate 910, and one end of the spacer 902 is fixed to the rear plate 910 via an adhesive member 912. The spacer 902 can be fixed to the face plate 901 via the adhesive member 912, or both sides can be fixed to the face plate 901 and the rear plate 910 via the adhesive member 912. The image forming member 914 includes a glass plate, a black member called a black stripe, a phosphor, a metal back, and the like.
The wiring portion of the electron-emitting device group 913 passes through the space between the support frame 911 and the rear plate 910 and goes out of the hermetic container, and is connected to the drive circuit via the wiring take-out portion 915.

Various electron-emitting devices can be used in the image forming apparatus. Electron Emittin
g Device) is a surface conduction electron-emitting device (Su
rface Conductive Emitter). The surface conduction electron-emitting device utilizes a phenomenon in which electron emission is caused by flowing a current substantially parallel to the surface of a small-area thin film formed on a substrate. The surface conduction electron-emitting device will be described with reference to FIG. The substrate 1010 corresponds to the rear plate 910. In the surface conduction electron-emitting device, electrons are emitted from the electron-emitting portion 1019 by applying a voltage between the device electrodes 1016 and 1017 and flowing electricity through the conductive thin film 1018.

As the substrate 1010, quartz glass, Na
Such as glass with low impurity content, blue plate glass, SiO
_Two Glass substrates or ceramics such as alumina
Substrate can be used. Device electrodes 1016, 10
As the material of No. 17, a general conductive material is used. Guidance
The material forming the conductive thin film 1018 is Pd, Pt, R
u, Ag, Au, Ti, In, Cu, Cr, Fe, Z
metals such as n, Sn, Ta, W, Pb, PdO, In
_TwoO_Three, SnO_Two , PbO, Sb_TwoO_ThreeOxides such as HfB
_Two , ZrB_Two , LaB₆ , CeB₆ , YB_Four , GdB_Four 
Boride such as TiC, HfC, ZrC, TaC, Si
Carbides such as C and WC, nitriding such as TiN, HfN and ZrN
Materials, semiconductors such as Si and Ge, carbon, etc.
You can choose. The electron emitting portion 1019 is formed of the conductive thin film 1018.
These are high-resistance cracks formed in part of the
It is formed by forming or the like.

As the spacer 902, a thin plate is suitable. The number, arrangement, and the like of the spacers 902 are not particularly limited, and can be appropriately designed in consideration of the size of the screen, the pixel arrangement, the structure of the image forming member 914, and the like. Although the position where the spacer 902 is provided is not limited, it may be on a black stripe that does not adversely affect the image as an example. As for the material of the spacer 902, it is preferable that the thermal expansion coefficient is equal to that of the face plate 901, the rear plate 910, and the support frame 911, and it is best to use a material having the same thermal expansion coefficient. Specifically, it is preferable to use a material having a coefficient of thermal expansion in the range of 0.8 to 1.2. By using a material having the same coefficient of thermal expansion, it is possible to suppress the distortion of the sealed container itself even after the heating step. Specific materials include insulating materials such as glass, ceramics, and a material obtained by applying an insulating material to a metal. Further, spacer 90
2 and the support frame 911 may be configured separately,
For example, it may be processed by etching or the like to form an integral structure. As for the adhesive member 912, the face plate 901 is used.
Alternatively, it can be appropriately selected from those capable of bonding and fixing the rear plate 910 and the spacer 902, but an example is frit glass. The frit glass preferably has a softening temperature of 410 ° C. or lower, and desirably a black color. Regarding the composition of the frit glass, the face plate 901, the rear plate 910,
It is desirable that the composition be such that a thermal expansion coefficient equivalent to that of the spacer 902 and the support frame 911 is obtained.

[0036]

As described above, the present invention relates to a positioning jig for precisely joining a spacer to a predetermined position of a face plate or a rear plate of a flat image forming apparatus using an electron source. A plurality of strip-shaped split plates having cutouts for inserting the spacers at predetermined positions on the longitudinal end face is used, and the strip-shaped split plates each having a dimension whose width direction matches the predetermined interval of the spacers. By configuring the assembly jig by adjoining and arranging in parallel, there is an effect that the positioning accuracy of the spacer with respect to the face plate or the rear plate can be improved according to the measured dimensions of the black stripe of the face plate or the rear plate. . Further, the combination of the strip-shaped split plates allows the side surface of the shape hole holding the spacer to be opened as a notch, so that the shape hole can be easily and accurately processed.

Further, by making the coefficient of thermal expansion of the strip-shaped divided plate substantially equal to the coefficient of thermal expansion of the face plate or the rear plate, the accuracy of positioning at room temperature is maintained in the subsequent heating step for joining. Does not shift.

Further, a member having a thermal expansion coefficient larger than the thermal expansion coefficient of the strip-shaped split plate is attached to a portion of the cutout portion in contact with the longitudinal surface of the spacer, so that the clearance for insertion is maintained at room temperature, and In the heating step for joining to the face plate or the rear plate after the positioning, the clearance between the spacer and the figure hole is reduced due to the difference in thermal expansion between the assembled member and the split plate, and the positioning accuracy is further improved.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a positioning jig according to a first embodiment of the present invention.

FIG. 2 is a schematic perspective view before a face plate and a spacer to be assembled of a jig are assembled.

FIG. 3 is a schematic perspective view after a face plate and a spacer to be assembled of a jig are assembled.

FIG. 4 is a schematic perspective view of a divided body constituting the assembly jig of the present invention.

FIG. 5 is a schematic perspective view of an assembling jig configured according to a black stripe.

FIG. 6 is a schematic perspective view after all the spacers have been inserted into the assembly jig.

FIG. 7 is a schematic perspective view of a divided body constituting an assembly jig according to a second embodiment of the present invention.

FIG. 8 is a schematic perspective view of an assembly jig configured according to a black stripe.

FIG. 9 is a schematic sectional view showing an example of an image forming apparatus to which the positioning jig and the positioning method of the present invention are applied. FIG. 1A is a schematic sectional view illustrating an example of an image forming apparatus. FIG. 2B is an enlarged schematic cross-sectional view of a side wall of the image forming apparatus.

FIG. 10 is a schematic view of a surface conduction electron-emitting device. FIG. 3A is a schematic plan view of a surface conduction electron-emitting device. FIG. 2B is a schematic sectional view of the surface conduction electron-emitting device.

FIG. 11 is an exploded perspective view of a fluorescent display tube using a cover glass disclosed in the official gazette.

[Explanation of symbols]

 1, 901 Face plate 1a Black stripe 1b, 1125, 1126 Frit glass 2, 72, 902, 1102 Spacer 3, 73 Assembly jig 4, 74 Notched divided body 4a, 74a Notched divided body 4b Notched part 4b Long side 4c Short side of divided body 4d, 74d Shape hole for holding spacer 5, 75 Non-notched divided body 6 Assembly table 6a First butting part 6b Second butting part 6c Horizontal part 7 Spring reaction force receiving block Reference Signs List 8 ceramic spring 79 stainless steel plate 910 rear plate 911 support frame 912 adhesive member 913 electron emission element group such as surface conduction electron emission element 914 image forming member 915 wiring takeout part 1010 substrate 1016, 1017 element electrode 1018 conductive thin film 1019 electron emission Part 1101 Front glass substrate 1110 Anode base 1120 emitting anode 1121 control grid 1122 filament wire 1123 holes exhaust pipe 1124 exhaust pipe

Claims (4)

(57) [Claims] 1. A positioning jig for precisely joining a spacer to a predetermined position on a face plate or a rear plate of a flat image forming apparatus using an electron source, wherein the spacer is held at a predetermined position. An assembly jig for aligning a face plate or a rear plate to be joined with the assembly jig, and the assembly jig is constituted by a parallel combination of a plurality of strip-shaped divided plates. A notch in which a hole into which the spacer can be inserted is formed at a predetermined position on one end face in the longitudinal direction of the strip-shaped divided plate in combination with another end face in the longitudinal direction of the adjacent strip-shaped divided plate. Wherein the width of the strip-shaped division plate in the width direction is substantially equal to a predetermined interval of the spacer. 2. The positioning jig according to claim 1, wherein a material of said strip-shaped divided plate is a material having a thermal expansion coefficient substantially equal to that of said face plate or said rear plate to be joined. A positioning jig for an image forming apparatus. 3. The positioning jig according to claim 1, wherein a member having a coefficient of thermal expansion larger than a coefficient of thermal expansion of the strip-shaped divided plate is attached to a portion of the notch portion in contact with the longitudinal surface of the spacer. A positioning jig for an image forming apparatus. 4. A method for positioning an image forming apparatus using a positioning jig according to claim 1, wherein the spacer is formed in a hole formed by the notch of the assembly jig. And the assembly jig and the face plate or the rear plate to be joined are positioned and fixed on the assembly table, and the spacer and the face plate or the rear plate to be joined are And a method for positioning the image forming apparatus.