JP2003226453A - Tape sticking device and meandering correction guide roller using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tape sticking device suitable for performing masking treatment on an application start part and an application completion part in applying phosphor paste between ribs of a substrate of plasma display panel by a dispenser method. <P>SOLUTION: A tape sticking unit 30 can reciprocate in a lateral direction against a guide part 20. Tape T from a winder M set in an attaching position goes through a sending out means (a sending out roller 31) for sending out the tape T, a tension control device (a dancer roller 32) for controlling tension of the tape T, meandering correction means (EPC roller 34, meandering correction guide roller 35) for meandering correction of the tape T, and a sticking means (sticking roller 36) for sticking a tip of the tape on a substrate on a tip of the tape. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of unwinding a tape from a reel and pasting it onto a substrate, and in particular,
The present invention relates to a tape applying device that is preferably used in a fluorescent screen forming process of a plasma display panel (hereinafter referred to as PDP).

[0002]

2. Description of the Related Art Generally, a PDP has a structure in which a pair of electrodes, which are regularly arranged, are provided on two opposing glass substrates, and a gas mainly containing Ne, Xe or the like is sealed between them. Then, a voltage is applied between these electrodes,
By generating an electric discharge in a minute cell around the electrode, each cell is caused to emit light to perform display. In order to display information, regularly arranged cells are selectively discharged and emitted. There are two types of PDP, a direct current type (DC type) in which electrodes are exposed in the discharge space and an alternating current type (AC type) in which an electrode is covered with an insulating layer. Both types are different in display function and driving method. Further, it is classified into a refresh drive system and a memory drive system.

FIG. 1 shows an example of the structure of an AC type PDP. This figure shows a state in which the front plate and the rear plate are separated from each other. As shown in the figure, two glass substrates 1 and 2 are arranged in parallel and opposite to each other, and both of them serve as a rear plate. The stripe-shaped ribs 3 provided in parallel with each other on the glass substrate 2 hold the glass substrate 2 at regular intervals. A sustain electrode 4 is provided on the back side of the glass substrate 1 which is the front plate.
A composite electrode composed of a transparent electrode and a bus electrode 5 is formed in parallel with each other, and a dielectric layer 6 is formed so as to cover the composite electrode, and a protective layer 7 is further formed thereon.
(MgO layer) is formed. Address electrodes 8 are formed in parallel with each other between the ribs 3 on the front side of the glass substrate 2 serving as a back plate so as to be orthogonal to the composite electrode, and a dielectric layer may be formed on the address electrodes 8 if necessary. 9 is formed, and a phosphor layer 10 is provided so as to cover the wall surface of the rib 3 and the cell bottom surface. This AC type PDP is a surface discharge type, and has a structure in which an AC voltage is applied between the composite electrodes on the front plate to discharge with an electric field leaking into the space. In this case, since the alternating current is applied, the direction of the electric field changes according to the frequency. Then, the phosphor layer 10 is caused to emit light by the ultraviolet rays generated by this discharge, and the observer visually recognizes the light transmitted through the front plate.

In the back plate of the PDP as described above, the address electrode 8 is formed on the glass substrate 2, the dielectric layer 9 is formed to cover the address electrode 8 if necessary, and then the rib 3 is formed. It is manufactured by providing the phosphor layer 10 between the ribs 3. As a method of forming the electrode 8, a method of forming a film of an electrode material on the glass substrate 2 by a vacuum vapor deposition method, a sputtering method, a plating method, a thick film method, etc., and patterning the film by a photolithography method, and a thick film paste. A method of patterning by a screen printing method using is known. The dielectric layer 9 is formed by screen printing or the like. The ribs 3 are pattern-formed by overprinting by screen printing, sand blasting, or the like.

The phosphor layer 10 is selectively filled with phosphor paste for each color of red (R), green (G), and blue (B) between the ribs 3, dried, and then baked. The screen is formed by filling the phosphor paste. That is, the step of selectively filling the space between the ribs with the phosphor paste by screen printing and drying is repeated three times, and then firing is performed. However, it is necessary to use a screen plate corresponding to the higher definition and larger area of the PDP. However, since such a screen plate stretches or distorts, the position of the rear plate relative to the glass substrate is increased. Difficult to match,
There is a problem that the phosphor paste cannot be filled accurately.

Therefore, recently, it has been proposed to efficiently apply the phosphor paste between the ribs by a dispenser method. This dispenser method uses a coating head having a plurality of discharge holes in a direction perpendicular to the coating direction,
This is a method of applying the phosphor paste between the ribs while relatively moving the coating head so as to face the substrate. According to this method, by using a coating device incorporating a plurality of coating heads 3 colors of body paste can be applied simultaneously.

When the phosphor paste is applied by such a dispenser method, the phosphor paste is ejected from a plurality of ejection holes formed in a row in the nozzle portion of the application head. At the end portion, there is a circumstance that the discharge pressure is unstable and the coating state is not stable. Therefore, as shown in FIG. 2, it is necessary to perform a masking process on the end portions of the ribs R on the substrate G with the tape T before the paste application, and this masking process is performed. It is performed by a commercially available tape applying device.

[0008]

However, the conventional tape applying device has a problem that the slit accuracy and the winding state of the tape are poor and the accuracy of the applying position is low. Specifically, as in the case of the winding M shown in FIG. 3, the center has a bamboo shape with one side protruding, and the center protrusion b is ± 2 mm.
It also becomes. The slit precision that determines the width a of the tape T is ± 0.5 mm. Therefore, it is necessary to correct the meandering of the tape and align the position in the width direction of the tape.
In particular, in the case where the tape T is applied to the starting portion and the ending portion of the phosphor paste on the substrate G as shown in FIG.
Since the reference end faces of the tape T in both parts are opposite,
Even if the centers of the tapes are aligned, the position of the end surface of the tape is displaced by the slit error and the required accuracy cannot be satisfied.

Further, since the adhesive surface is on the rib or the electrode, it is difficult to adhere the tape, and since the tape having a weak adhesive force is used from the viewpoint of protecting the substrate when it is peeled off, the tape may be adhered during the application. There was also a problem that it was pulled by the tension and peeled off. Further, since the wettability of the tape surface is low, there is a problem that the applied phosphor paste is repelled and the applied state becomes unstable.

The present invention has been made in view of the above circumstances, and an object of the present invention is to apply a phosphor paste between ribs of a substrate of a PDP by a dispenser method and to start and finish the application. It is an object of the present invention to provide a tape applying device suitable for performing a masking process on a portion, and also to provide a meandering correction guide roller suitably used for the tape applying device.

[0011]

To achieve the above object, a tape applying apparatus according to the present invention comprises a guide portion and a tape attaching unit attached to the guide portion so as to be capable of reciprocating movement. The tape application unit
The tape from the winding set in the mounting position is a feeding means for feeding the tape, a tension control means for controlling the tension of the tape, a meandering correction means for correcting the meandering of the tape, and the tip of the tape on the substrate. It is configured to sequentially pass through the pasting means for pasting, has a cutter for cutting the tape after the pasting means, and further has a detection means for reading the position of the tape in front of the pasting means. It is characterized by being.

In the tape applying apparatus having this structure, it is preferable to provide a deciding and pressing means for pressing and adhering the tape adhered to the substrate after the adhering roller, and further after adhering the tape to the substrate, It is preferable to provide an application means for applying the liquid on the tape.

Further, as the meandering correction means in the above-mentioned tape applying device, the meandering correction guide roller has a guide groove having an opening narrower than the bottom and having an opening between the bottoms in the roller width direction when viewed in cross section. Can be used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a perspective view showing an example of a tape applying apparatus according to the present invention together with a substrate. As shown in the drawing, this tape applying apparatus is capable of reciprocating traveling with respect to a lateral guide portion 20. The tape application unit 30 is attached as described above.

The guide portion 20 has two LM guides 21 on the front surface and a ball screw 22 in the middle thereof, and the ball screw 22 is rotated by a motor 23 so that the tape sticking unit 30 is moved along the LM guide 21. Reciprocate laterally.

In the tape application unit 30, the tape T from the winding M set at the mounting position is used to feed the tape T, a dancer roller 32 for controlling the tension of the tape T, and an edge detection sensor 33. EPC (Edge Position Control) roller 34 that corrects the meandering of the tape based on the data detected by the tape end with
A meandering correction guide roller 3 having a specially shaped guide groove
5. It is configured to sequentially pass through a vertically movable sticking roller 36 for sticking the tip of the tape to the substrate. Further, after the pasting roller 36, a cutter 37 for cutting the tape is provided. Further, in front of the sticking roller 36, there is a camera 38 for reading at least one edge of the tape.
An image processing unit is connected to.

Further, the tape applying unit 30 is provided with a deciding pressing roller 39 for pressing the tape T adhered to the substrate G to bring it into close contact after the applying roller 36, and further, the tape T is attached to the substrate G. A coating roller 40 for applying a liquid is provided on the tape T after sticking, and a syringe 41 for supplying the liquid to the coating roller 40 is arranged above the coating roller 40.

The tape applying apparatus shown in FIG. 4 is shown in FIGS.
The tape is adhered to the substrate by operating in the order shown in, and the tape adhering operation will be described in order.

First, the tape slit error is corrected before the tape is attached. Specifically, as shown in FIG. 5, after the image processing camera 38 detects at least one edge of the tape T to read the deviation amount, the substrate G is transported and the position is considered in consideration of the deviation amount. Stop. Alternatively, in parallel with the operation of stopping the conveyed substrate G at the position where the tape T is attached, the position of the tape attaching unit 30 is corrected in the direction perpendicular to the traveling direction of the tape attaching unit 30 (the conveying direction of the substrate G). . That is, by correcting the relative position between the tape applying unit 30 and the substrate G, the slit error of the tape T is corrected.

After the positional deviation of the tape at the beginning of the sticking is corrected in this way, the sticking roller 36 descends to stick the tip of the tape T to the substrate G, as shown in FIG. After that, the tape T is unwound from the winding M by the unwinding roller 31, and the tape adhering unit 30 travels along the guide portion 20 while adhering the tape T to the substrate G. At this time, the feeding roller 31 adjusts the feeding speed of the tape T while observing the position of the dancer roller 32. The tip of the tape T attached to the substrate G is the pressing roller 3
When the position of 9 is reached, the press roller 39 is lowered,
The tape T is attached while pressing it with an appropriate pressure so that the tape T comes into close contact with the substrate G.

The tape applying unit 30 runs while applying the tape T to the substrate G, and when the tip of the applied tape T reaches the position of the applying roller 40, the applying roller 40 is lowered as shown in FIG. Then, at the same time when the coating roller 40 descends, the syringe 41 is pressurized by a dispenser unit (not shown), and the liquid contained in the syringe 41 is gradually dropped onto the coating roller 40. It should be noted that the dropping is performed only when the coating roller 40 is lowered and the tape applying unit 30 is running. At this time, the amount of the liquid dropped is adjusted in advance so as to be transferred from the coating roller 40 to the surface of the tape T.

In this way, the tape sticking unit is run to the end position of sticking. During this traveling, the pay-out roller 31 adjusts the pay-out speed of the tape T while watching the position of the dancer roller 32, and at the same time, the EPC
The roller 34 rotates based on the data obtained by detecting the tape end by the edge detection sensor 33 and corrects the meandering of the tape T.

Then, as shown in FIG. 8, when the tape applying unit 30 reaches the end position of the applying operation, it is temporarily stopped and the applying roller 36 is raised. Pasting roller 36
When rises, the cutter 37 cuts the tape T.
When the cutting is completed, the tape applying unit 30 is made to run again, and the pressing roller 39 and the application roller 40 are raised when they reach the tape end position (cut position). When this series of operations is completed, the tape applying unit 30 returns to the start position.

In the tape applying unit 30 described above, the meandering correction of the tape is performed by the EPC roller 34, and the meandering correction guide roller 35 is passed through. In this case, the meandering correction guide roller 35 may be an ordinary guide roller, or the EPC roller 34 may not function and the meandering correction guide roller 35 may be used alone to correct the meandering of the tape.

The meandering correction guide roller 35 is for correcting the meandering of the running tape and is shown in FIG.
The guide groove is provided so that the relationship between the opening width s and the bottom width t, and the distance u from the roller end to the opening and the distance v to the bottom are s <t and u> v. As shown in FIGS. 9 and 10, the meandering correction guide roller 35 used in this example is provided with an inverted trapezoidal type guide groove 35a on the outer periphery when viewed in cross section. With a straight groove guide roller that is usually used, when the tape width is wider than the groove width, the tape is bent in the width direction at the bottom portion where the tape is held by the roller, and is folded back, as shown in FIG. Even if the tape width is wider than the opening width, using a guide roller with such a shape will prevent the bottom part holding the tape from being wider than the tape width, so it will not be folded back even if there is stiffness in the width direction of the tape. Since the end of the opening hits the tape by point contact in the vicinity of the portion with stiffness, the force can be efficiently transmitted in the width direction of the tape, and the meandering of the tape can be corrected.

When the tape-applying device of the present invention is used to perform masking treatment as a pre-treatment for paste application on a substrate on which ribs have been formed, both ends of the ribs in which the reference end of the tape is reversed The tape is attached to each section with high accuracy. When the phosphor paste is applied to the masked substrate by the dispenser method, the ejection pressure varies at the start and end of ejection, and even if the application is not stable, peel off the tape after application. Then, the paste application is performed with the ends aligned.

[0028]

As described above, according to the tape applying apparatus of the present invention, the tape slit accuracy and the winding state of the tape are not affected by at least one end of the tape as a reference, and the tape is in motion during running. The tape can be attached without meandering, and therefore the tape can be attached accurately. Even if the tape to be used has a weak adhesive force, the tape can be applied at high speed by feeding the tape in synchronization with the tape application speed and adjusting the tape tension optimally.

Furthermore, by providing a coating roller for applying a liquid on the tape after the tape is attached to the substrate, the wettability of the tape surface is improved, and when the paste is applied in a later step. In addition, it is possible to prevent application failure due to the influence of the tape portion.

The meandering correction guide roller of the present invention is
Since the opening is narrower than the bottom and has a guide groove in the shape of an opening between the bottoms when viewed in cross section, even when the tape width is wider than the width of the opening, Since the width is wider than the tape width, it does not fold back even if there is stiffness in the tape width direction, and the edge of the opening hits the tape by point contact near the portion with stiffness, so the force is applied efficiently in the tape width direction. Can be transmitted and the tape meandering correction can be performed.

[Brief description of drawings]

FIG. 1 is a structural diagram showing an example of the configuration of an AC type plasma display panel with its front plate and rear plate separated from each other.

FIG. 2 is an explanatory diagram of a masking process performed before applying a phosphor paste by a dispenser method.

FIG. 3 is a perspective view showing the tape in a wound state.

FIG. 4 is a perspective view showing an example of a tape applying device according to the present invention together with a substrate.

FIG. 5 is a diagram for explaining the operation of the tape sticking device shown in FIG. 4, and is an explanatory diagram for correcting the positional deviation of the tape before tape sticking.

FIG. 6 is a diagram for explaining the operation of the tape applying device shown in FIG. 4, and is an explanatory diagram when tape applying is started.

FIG. 7 is a diagram for explaining the operation of the tape applying device shown in FIG. 4, and is an explanatory diagram during the process of applying tape.

FIG. 8 is a view for explaining the operation of the tape applying apparatus shown in FIG. 4, and is an explanatory view of the end of tape applying.

FIG. 9 is a perspective view of a meandering correction guide roller.

FIG. 10 is a sectional view of a meandering correction guide roller.

[Explanation of symbols]

1 Front plate 2 Back plate 3 ribs 4 sustaining electrodes 5 bus electrodes 6 Dielectric layer 7 Protective layer (MgO layer) 8 address electrodes 9 Dielectric layer 10 Phosphor layer 20 Guide 21 LM Guide 22 Ball screw 23 motor 30 tape unit 31 Feeding roller 32 Dancer Laura 33 Edge detection sensor 34 EPC Roller 35 Meandering correction guide roller 36 Sticking roller 37 cutter 38 Image processing camera 39 Final push roller 40 coating roller 41 syringe G board M winding R rib T tape

Claims (7)

[Claims] 1. A guide part and a tape-applying unit attached to the guide part so as to be capable of reciprocating movement, wherein the tape-applying unit sets the tape from the winding set at the attaching position to pay out the tape. Feeding means, tension control means for controlling the tension of the tape, meandering correction means for correcting the meandering of the tape,
It is configured to sequentially pass through a pasting means for pasting the tip of the tape to the substrate, has a cutter for cutting the tape after the pasting means, and further reads the position of the tape before the pasting means. A tape applying device having a detecting means. 2. The tape applying apparatus according to claim 1, further comprising a deciding and pressing means for pressing and tightly adhering the tape adhered to the substrate after the applying means. 3. The tape applying apparatus according to claim 1, further comprising an applying means for applying the liquid onto the tape after the applying means. 4. The tape applying apparatus according to claim 1, wherein a dancer roller is used as the tension control means. 5. An EPC roller for correcting the meandering of the tape on the basis of the data obtained by detecting the tape end by the edge detection sensor as the meandering correcting means, and an opening narrower than the bottom and an opening between the bottoms when viewed in cross section. The tape applying apparatus according to claim 1, wherein at least one of the meandering correction guide rollers having a guide groove having a certain shape is used. 6. A camera equipped with an image processing unit is used as the detection means, and the relative position between the tape and the substrate can be corrected by detecting at least one edge of the tape. The tape applying apparatus according to any one of 1 to 5. 7. A guide roller for correcting the meandering of a tape, the guide roller having an opening narrower than a bottom portion and having a shape having an opening between the bottom portions in the roller width direction when viewed in cross section. A meandering correction guide roller.