JPH0971061A - Offset printing device and image forming device using the offset printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve ink accepting property, transferability, and stability with time of printing performance at the time of repeating printing by coating a surface of a blanket of an offset printing device with a water repellent agent. SOLUTION: A water repelling agent supply coating device 8 is slid on a water repelling agent coat surface plate 2 so as to expand a water repelling agent uniformly. A blanket 5 is lowered to an intermediate point between a work surface plate 1 and the water repelling agent coat surface plate 2 and turned to the left. Thus, the surface of the blanket 5 is coated with the water repelling agent uniformly. The blanket 5 is turned to the left as it is, made to receive an ink 11 of an intaglio 10 through the water repelling agent, and raised at the left end of the intaglio 10. Next, it is moved to the right end of the work surface plate 1 and lowered, made to come into contact with the work surface plate 1, and slid to the left. Thus, the ink 11 on the surface of the blanket 5 is transferred to the surface of the work surface plate 9 together with the water repelling agent, so that one printing operation is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset printing apparatus having a mechanism for improving ink acceptability and transferability, and a method for manufacturing an image forming apparatus using the offset printing apparatus.

[0002]

2. Description of the Related Art Conventionally, offset printing has been widely used for printing graphics, mainly for printing patterns that are visually perceptible to human eyes. Further, in recent years, technological developments have been made for producing electrodes of recording thermal heads, color filters of liquid crystal display devices, and the like as applications to electronic devices.

FIG. 10 is a view showing a flatbed proof machine type printing apparatus. In the figure, 101 is an ink kneading base for spreading the ink 107 on the ink roller 104, and 102 is a plate surface plate for fixing the intaglio plate 105. Further, 103 is a work surface plate for fixing a work 106, which is an object to be printed, and is fixedly arranged on the main body frame 108. Two rack gears 109 on both sides of the three surface plates arranged in a line,
110 is arranged, and the blanket 113 in which the pinion gears 111 and 112 are meshed is arranged on the rack gears 109 and 110. The blanket 113 has its shaft fixed by carriages 114 and 115 at both ends,
The carriages 114 and 115 are moved forward and backward by the crank operation of the crank arm 116 from the lower portion of the main body, and the blanket 113 sequentially rotationally slides on the ink mixing table 101, the intaglio plate 105, and the work 106.

11a to 11d are views showing an offset printing process. In this figure, FIG.
Is an intaglio, and 106 is a glass substrate to be a work, which are arranged in series on the same plane. Reference numeral 104 denotes an ink roll, which is an intaglio plate 1 for the ink 107 kneaded on the ink mixing table 101.
05 (Fig. 11a). Reference numeral 117 denotes a blade, which scrapes out the ink 107 transferred by sliding on the upper surface of the intaglio plate 105 except for the ink filled in the recesses (FIG. 11).
b). Reference numeral 113 denotes a blanket, which is rotated in contact with the intaglio plate 105 and the upper surface of the glass substrate 106 in this order, so
The ink filled in the concave portion of 05 is received (Fig. 11c),
The ink 107 is transferred onto the glass substrate 117 in the pattern of the intaglio plate 105 (FIG. 11d).

The printing process is completed as described above. The printing ink 107 can be appropriately selected depending on the function of the pattern to be produced. That is, organic Au, which is called Au resinate paste, is mainly used for electrodes of recording thermal heads and the like.
An ink made of a metal is used, and in the case of a color filter, an ink in which raw materials of R, G, and B colors are dispersed, an ink containing an organic dye, or the like is used.

Conventionally, as a display technology for realizing a flat-panel display device, a simple matrix liquid crystal display device (LC
D), thin film transistor liquid crystal display device (TFT / LC
D), plasma display (PDO), low-speed electron beam fluorescent display (VFD), multi-electron source flat CRT, and other flat panel display technology.

As an example of these display technologies, a light emitting element for emitting a phosphor using a multi electron source and a flat panel display device using the same will be described.

Conventionally, MIElison, Radio Eng. Electron Pys., Has been used as an element capable of emitting electrons with a simple structure.
A surface conduction electron-emitting device announced by 10, (1965) and others is known.

This utilizes a phenomenon in which electron emission occurs when a current is applied to a thin film having a small area formed on a substrate in parallel with the film surface.

As this surface conduction electron-emitting device, one using the SnO ₂ thin film by Erinson et al.
By thin film [G.Dittmer: “Thin Solid Films”, 9,
317 (1972)], In ₂ O ₃ / SnO ₂ thin film [M. Hartwell and CGFonstad: “IEEE Trans. ED Con
f. ”, 519 (1975)], by a carbon thin film [Hiraki Araki et al .:
Vacuum, Vol. 26, No. 1, p. 22 (1983)] and the like are reported.

As a typical element structure of these surface conduction electron-emitting devices, the above-mentioned M. The Hartwell device configuration is shown in FIG. In the figure, 201 is an insulating substrate, and 202
Is a thin film for forming an electron emitting portion, and is made of an H-shaped metal oxide thin film formed by sputtering, and the electron emitting portion 203 is formed by an energization process called forming described later. Reference numeral 204 is called a thin film including an electron emitting portion.

Conventionally, in these surface conduction electron-emitting devices, the electron-emitting portion forming thin film 2 is formed before the electron emission.
In general, the electron-emitting portion 203 was previously formed by an energization process called forming. That is, the forming means the thin film 202 for forming the electron emitting portion.
A voltage is applied to both ends of the electron emission part to locally destroy, deform or alter the electron emission part forming thin film to form the electron emission part 203 in an electrically high resistance state.
The electron emitting portion 203 is the electron emitting portion forming thin film 202.
There is also a case where a crack is generated in a part of the area and electrons are emitted from the vicinity of the crack.

The applicant of the present invention has also proposed USP 5,066,8.
At 83, a technology of a novel surface conduction electron-emitting device in which fine particles for emitting electrons are dispersedly arranged between device electrodes is disclosed. Compared with the conventional surface conduction electron-emitting device, the electron-emitting device can precisely control the electron-emitting position and can arrange the electron-emitting devices with higher precision. A typical device structure of this surface conduction electron-emitting device is shown in FIG. In the figure, 301 is an insulating substrate, and 302 and 30.
Reference numeral 3 is an element electrode for obtaining an electrical connection, 304 is a thin film made of a fine particle electron emitting material dispersed, and 305 is an electron emitting portion.

In this surface conduction electron-emitting device, the electrode spacing between the pair of electrodes 302 and 303 is 0.01 μm to 100 μm, and the sheet resistance of the electron-emitting portion of the thin film 304 is 1 × 10 ³ ohms / □ -1. × 10 ⁹ ohm / □ is suitable.

When the surface conduction electron-emitting device described above is used as an electron-emitting device, it must be placed in a vacuum container in order to fly an electron beam. A face plate is provided almost vertically above this element in a vacuum container to form an electron emitting device, a voltage is applied between the electrodes, and the phosphor is irradiated by the electron beam obtained from the electron emitting portion. It can be made to emit light and can be used as a light emitting element or a flat panel display device.

[0016]

However, there are the following problems in forming a pair of device electrodes of the surface conduction electron-emitting device of the image forming apparatus as described above by using the offset printing method. To do.

In the ordinary offset printing method, when the printing material (such as a glass substrate) is transferred to the ink received from the plate (such as an intaglio) on the surface rubber of the blanket,
Not 100% of the ink is transferred, generally 50-90% of the ink is transferred and 10-50% of the ink remains on the blanket surface rubber. Further, even with an offset printing apparatus designed with high accuracy, a positional deviation repetition error of about 5 to 20 μm occurs. Therefore, during repeated printing work, it is usual that a slight amount of dullness is generated on the second and subsequent printed materials.

However, as shown in FIG. 13, the above-mentioned pair of device electrodes must be controlled at an arbitrary electrode interval (L in the figure) of 0.01 to 100 μm (more preferably 0.1 to 30 μm). is there. Therefore, when a pair of element electrodes is formed by using a normal offset printing method, a double ink is left on the blanket surface rubber at the time of the previous printing, and the electrode interval (L in FIG. 13) is controlled to be constant. It becomes impossible, and in the worst case, the electrode interval becomes 0, the element electrodes are short-circuited, and the surface conduction electronic element itself does not function.

Further, when the transfer amount of the ink on the surface of the blanket to the printing object (such as a glass substrate) is less than 100% as described above, cohesive failure of the ink occurs when the blanket releases the printing object, and the printing surface The surface layer of is rough. Therefore, the surface roughness of the pair of element electrodes (302, 303 in FIGS. 13, 302) formed by printing in such a state becomes large.

As described above, the transfer of ink is 10
The problem caused by the fact that the amount is not 0% can be solved by selecting and using a material (silicon rubber or the like) having an appropriate surface tension for the blanket surface rubber (Japanese Patent Laid-Open No. 6-25
5279, 255280).

However, although silicone rubber is excellent in ink transferability, this good ink transferability is due to the contribution of the low molecular weight silicone oil that gradually breathes from the inside of the silicone rubber to the surface, and therefore the printing is repeated. The change with time was large and the ink was 100% good at first, but the low molecular weight silicone oil on the surface of the blanket decreased with each repetition,
Finally, 100% ink transfer may not be possible.

Many of the above-mentioned silicone rubbers are originally not excellent in solvent resistance. Therefore, when printing is repeated, the ink contained in the ink is used for image transfer and transfer of the ink. The surface of the silicon rubber blanket corresponding to the part is swollen and deformed. for that reason,
As the number of times of printing is increased, the electrode interval (L in FIG. 13) deviates from the design width and the linearity of the edge becomes worse.

An object of the present invention is to solve the above problems at all, to provide an offset printing apparatus which is excellent in ink acceptability and transferability, and is excellent in stability of printing performance with time when repeatedly printed, An object of the present invention is to provide a method of manufacturing an image forming apparatus using the offset printing apparatus.

[0024]

In order to achieve the above-mentioned invention, the present invention has a mechanism for applying a water repellent agent to the surface of a blanket. An image forming apparatus is manufactured by printing and forming a pair of element electrodes.

That is, the present invention is to provide an offset printing apparatus having a mechanism for applying a water repellent agent to the surface of a blanket.

Further, in the present invention, the water repellent agent is applied to the blanket surface every time printing is performed or every predetermined number of times, and ink reception from the plate and ink transfer to a printing material are conducted through the water repellent agent interface. An object of the present invention is to provide an offset printing apparatus characterized by being performed.

The present invention also provides an offset printing apparatus wherein the blanket comprises a rubber material, and the surface of the rubber material is a material which does not swell due to the solvent of ink and the water repellent. To do.

Further, the present invention provides a method of manufacturing an image forming apparatus, characterized in that the offset printing apparatus is used to form element electrodes of a surface conduction electron-emitting device.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view best showing the features of the offset printing apparatus of the present invention. In the figure, reference numeral 1 is a work surface plate for fixing a work 9 which is an object to be printed, and 2 is a water repellent agent application surface plate for developing a water repellent agent 12 supplied from a water repellent agent application device 8. 3 is intaglio 1
0 is a plate surface plate for fixing 0, 4 is an ink mixing surface plate for developing the ink 11, and each surface plate is a main frame 1
It is fixed to 2. 6 is an ink kneading roller,
The ink 11 developed by the ink kneading platen 4 is transferred onto the intaglio plate 10, and the doctor blade 7 slides on the intaglio plate 10 to scrape off excess ink other than the recessed parts. Reference numeral 8 denotes a water-repellent agent supplying / applying device, which slides on the water-repellent agent-applying platen 2 to uniformly spread the water-repellent agent 12. After that, the blanket 5
At the midpoint between the work surface plate 1 and the water repellent application surface plate 2, the work surface plate 1 descends and rotates to the left, so that the water repellent 12 is uniformly applied to the blanket surface. Next, the blanket 5 rotates to the left as it is, the surface of the blanket receives the ink 11 in the concave portion of the intaglio plate 10 through the water repellent, and rises at the left end of the intaglio plate 10. After that, the blanket 5 moves to the right end of the work surface plate 1 and then descends, slides to the left on the surface of the work 9 to remove the ink 11 received on the blanket surface from the water repellent 12.
Is transferred to the surface of the work 9 together with part of the above, and one printing operation is completed. When performing repeated printing, the work 9 may be replaced with a new one and the same operation may be repeated. In the series of printing operations described above, a novel part of the present invention is that the offset printing apparatus has a mechanism for applying a water repellent agent to the blanket surface, and in FIG. This corresponds to the water repellent agent supplying / applying devices (8) and (8).

Further, in the above series of printing operations, since the water repellent is applied to the blanket surface after every printing or every predetermined number of times, the blanket surface always has a sufficient amount of the water repellent. Since the ink is received and transferred via the ink, stable printing without time change is always possible.

As the water repellent used in the present invention, any water repellent liquid such as polymethylene (alkane oil), polyalkyl ether, polysiloxane, polyfluoroalkyl ether can be used, but especially 10 ~
Liquid in the temperature range of 40 ° C (at least 10-40
A substance having a liquid state in the temperature range of ° C) is preferable, and a substance having a surface tension of 30 dyne / cm or less can be preferably used. If properly selected depending on the ink used at the time of printing, it is possible to transfer the ink well to the work by 100%. In particular, when using a resinate paste of a noble metal such as Au or Pt as an ink when printing and forming a pair of device electrodes of the surface conduction electron-emitting device of the image forming apparatus, polydimethylsiloxane is used as a water repellent agent. If used as, good acceptance and transfer is possible.

Any rubber material can be used for the surface rubber of the blanket as long as the water repellent agent is evenly adhered thereto, that is, the surface tension of the rubber surface is larger than the surface tension of the water repellent agent. It is also possible to use a rubber material.

However, if the surface of the blanket rubber swells with the solvent contained in the ink, a good shape cannot be printed. Therefore, a material that does not swell with the solvent containing the ink and the water repellent is used. It is preferable to use ethylene propylene rubber, hydrogenated butyl rubber, cured urethane rubber, etc., which have excellent properties.

When a pair of element electrodes of the surface conduction element of the image forming apparatus are printed by using the offset printing apparatus as described above, the ink is well received and even if the printing is repeated, 100% of the ink is discharged. Since the transfer is performed, no dubbing occurs in the printed matter, and cohesive failure of the ink does not occur when the blanket is released from the work, so that a good element electrode having a small surface roughness on the surface of the printed surface can be obtained. Further, since the blanket rubber material does not swell due to the ink-containing solvent, element electrodes having stable electrode intervals and excellent edge linearity are formed even after repeated printing.

[0035]

【Example】

(First Example) A pair of device electrodes of a surface conduction electron-emitting device were printed by using the offset printing apparatus having the structure shown in FIG. The basic operation of this printing apparatus has been described in detail in the section of (Means and Actions for Solving the Problems), and therefore omitted, but further description will be given on the part of the water repellent agent supplying / applying device, which is the feature of the present invention. To do. FIG. 4 is a schematic diagram showing the configuration. 8 itself has a rectangular parallelepiped tank shape, the inside of which is filled with a necessary amount of the water repellent 8-2, and a spatula-shaped felt 8-1 is attached to the tip thereof. The water repellent that has penetrated from the felt tip is supplied to the surface of the water repellent coating platen 2 of FIG. 1, and by sweeping 8 on this surface, a water repellent film of uniform thickness is formed on this surface. It is formed.

The water repellent used in this example is dimethyl silicone oil SH200 (viscosity 1000 cs) manufactured by Toray Down Corning Silicon Co., Ltd. Ethylene propylene rubber having a surface roughness (Ra) of 0.5 μm was used for the blanket. The shape of the pair of device electrodes engraved on the used intaglio is 100 × 200 as shown in FIG.
The rectangular shape of μm has a shape facing each other across a gap of 20 μm. The depth of the intaglio plate was about 8 μm. As other printing conditions, the speed of the blanket 5, the doctor blade 7, and the water-repellent agent application device 8 are all set to 20.
The blanket pressing amount was 0.2 mm on the work 9 and the intaglio 10, and 0.05 mm on the water repellent coating platen 2.

After the printing was completed once under the above conditions, the work 9 was exchanged, and thereafter, a total of 50 times, that is, 50 works were printed. Regarding the first and last printing,
The film thickness of the ink adhering to the work 9 and the blanket 5 is measured by a laser film thickness meter, and the ink transfer rate (ink thickness on the work / (ink thickness on the work + ink thickness on the blanket) × 100%) It was calculated. Further, since Au resinate paste (solvent terpineol) was used for the above ink, 50 printed works were dried at 70 ° C. for 10 minutes and then baked at 550 ° C. for 30 minutes to form a thin film of metal Au. Converted After that, the width of the gap and the surface roughness (Ra) of the pair of printed element electrodes of each work were measured using α-step manufactured by Tencor. The above measurement results are shown in Table 1 and FIGS. 8 and 9. As can be judged from this, the ink transfer rate is 100% both in the first time and in the last time, and the gap width and the surface roughness are extremely stable.

(Second Embodiment) A pair of device electrodes of a surface conduction electron-emitting device were printed by using the offset printing apparatus having the structure shown in FIG. Instead of the water repellent coating platen 2 and the water repellent supply coating device of the printing apparatus of FIG. 1 used in the first embodiment, a porous structure is provided in the oil pan 14 of FIGS. 2 and 5. A water repellent supply / application mechanism having a structure in which 15 is fixed and a water repellent 13 is poured is used.

In this example, a polyvinyl alcohol structure was used for the porous structure 15 so that good contact with the blanket 5 could be obtained. An appropriate amount of water repellent is always present on the upper surface of this porous structure. Fifty sheets of work were printed by the same procedure as in the first example, and the same measurement and evaluation were performed. The results are shown in Table 1, FIG. 8 and FIG. 9, and good results were obtained as in the first example.

(Third Example) A pair of device electrodes of the surface conduction electron-emitting device were printed by using the offset printing apparatus having the structure shown in FIG. This is similar to the structure of the conventional offset printing apparatus shown in FIG.
The water-repellent agent coating roll shown in FIG. This roll has a structure as shown in FIG.
The water-repellent agent supplied from the water-repellent agent supply port 3 of FIG. 3 exudes to the 16-1 felt surface through the porous structure 16-2. In this example, a porous ceramic of 16-2 was made of a porous ceramic in order to improve mechanical accuracy. The movement of the water repellent coating roll 16 will be described. When the blanket 5 moves to the left on the work surface plate 1, the blanket 5 comes into contact with the water repellent and the water repellent is applied to the blanket 5.
While moving to the left, the work surface plate 1 is released, and when the blanket 5 enters the plate surface plate 3, the water repellent coating roll 16 is opened, and the blanket 5 is moved to the right end of the work surface plate 1 again. When you come to, contact and repeat this.
By the above operation, the intaglio 1 is formed on the surface of the blanket 5.
When the ink is received from 0, the water repellent is always present. Printing 50 works by the same procedure as in the first embodiment,
The same measurement evaluation was performed. The results are shown in Table 1, FIG. 8 and FIG. 9, and the same good results as in the first example were obtained.

[0041]

[Table 1] (First Comparative Example) A pair of surface conduction electron-emitting devices were printed with element electrodes by using an offset printing apparatus having no mechanism for applying a water repellent agent to the blanket surface shown in FIG. The blanket material used at this time had the same surface roughness (Ra) as that of the first, second and third embodiments.
In the following, using 50 μm ethylene propylene rubber, 50 sheets of work were printed by the same procedure as in the first example, and the same measurement and evaluation were performed. The results are shown in Table 1, FIG. 8 and FIG.
Shown in Looking at this result, because the ink transfer rate is poor,
It can be seen that the surface roughness is always high and the width of the gap is extremely small except for the first time, so that the gap is extremely small.

(Second Comparative Example) Instead of the ethylene propylene rubber blanket of the first comparative example, a silicon rubber blanket having a surface roughness (Ra) of 0.5 μm was used. Otherwise, it is the same as the first comparative example. Similarly, 50 works were printed by the same procedure and the same measurement and evaluation were performed. The results are shown in Table 1, FIG. 8 and FIG. Looking at this result, since the blanket is made of silicon rubber, 100% ink transfer is possible at the initial stage. But 50
The second time, it was a little worse, 88%. Further, since the ink solvent is absorbed and swells gradually, the gap width becomes larger as the number of times is repeated.

[0043]

As described above, according to the present invention,
Since an offset printing device that has a mechanism for applying a water repellent to the blanket surface is used, ink is received and transferred through the water repellent interface, and a blanket made of a rubber material that does not swell in the solvent containing ink is used. Available,
Stable ink reception and 100% ink transfer are always possible, and when printing is repeated, offset printing with excellent print performance stability over time is possible. Further, by printing a pair of element electrodes of the surface conduction electron-emitting device by using the offset printing apparatus of the present invention, it is possible to manufacture an image forming apparatus having excellent quality.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing characteristics of an offset printing apparatus of the present invention.

FIG. 2 is a diagram of an offset printing apparatus used in a second embodiment.

FIG. 3 is a diagram of an offset printing apparatus used in a third embodiment.

FIG. 4 is a schematic diagram showing a part of the water repellent agent supplying / applying device used in Example 1.

FIG. 5 is a diagram showing a part of the water repellent agent supplying / applying device used in Example 2;

FIG. 6 is a view showing a part of the water repellent agent supplying / applying device used in Example 3;

FIG. 7 is a diagram showing a shape of a pair of device electrodes engraved on an intaglio plate.

FIG. 8 is a diagram showing a result of evaluation of printing by the number of times of printing and a gap width.

FIG. 9 is a diagram showing a result of evaluation of printing based on the number of times of printing and surface roughness.

FIG. 10 is a diagram showing a conventional flatbed proofing machine type printing apparatus.

FIG. 11 is a diagram showing a conventional offset printing process.

FIG. 12: M. It is a figure which shows the element structure of Hartwell.

FIG. 13 is a diagram showing a typical device configuration of a surface conduction electron-emitting device.

[Explanation of symbols]

 1 Work board 2 Water repellent coating surface plate 3 Plate surface plate 4 Ink kneading surface plate 5 Blanket 6 Ink kneading roller 7 Doctor blade 8 Water repellent liquid supplying / applying device 8-1 Felt 8-2 Water repellent 9 Work piece 10 Intaglio 11 Ink 12 Main body frame 13 Water repellent 14 Oil pan 15 Porous structure 16 Water repellent coating roll 16-1 Felt 16-2 Porous structure 16-3 Water repellent supply port 101 Ink mixing table 102 Plate plate 103 Work surface plate 104 Ink roller 105 Intaglio 106 Work 107 Ink 108 Body frame 109,110 Rack gear 111,112 Pinion gear 113 Blanket 114,115 Carriage 116 Crank arm 116 117 Blade

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Claims (5)

[Claims] 1. An offset printing apparatus comprising a mechanism for applying a water repellent agent to the surface of a blanket. 2. The water repellent agent is applied to the blanket surface every time printing is performed or every predetermined number of times, and ink reception from the plate and ink transfer to a printing material are performed via the water repellent agent interface. An offset printing device characterized by: 3. The offset printing apparatus, wherein the blanket is provided with a rubber material, and the surface of the rubber material is a material that does not swell due to the solvent containing ink and the water repellent. 4. A method of manufacturing an image forming apparatus, wherein element electrodes of a surface conduction electron-emitting device are formed by using the offset printing apparatus. 5. An offset printing apparatus, wherein the water repellent is liquid in the range of 10 to 40 ° C. and has a surface tension of 30 dyne / cm or less.