JPH07273499A - Panel holding device - Google Patents

Abstract

PURPOSE:To reliably hold a panel without generating a positional error and distortion in the panel. CONSTITUTION:In a panel holding device 1 in which a suction pad 3 is provided on a panel setting surface 2 with a recess made in the upper surface of the suction pad 3 and connected to a vacuum source to form a pressure-reduced space closed by a panel set thereon, the recess of the suction pad 3 is formed by grooves, such as, radial grooves 5 having a width smaller than a value obtained by dividing the area of an upper surface aperture by 1.5 times the diameter or the maximum side length of the suction pad 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel holding device for adsorbing and holding various panels such as liquid crystal panels and printed circuit boards.

[0002]

2. Description of the Related Art For example, in the process of manufacturing a liquid crystal panel, when an IC component for driving the liquid crystal panel is mounted on the glass panel constituting the liquid crystal panel, the glass panel is held by a holding device and positioned at a predetermined position. , The position is recognized, the mounting head sucks the IC component supplied to the predetermined position, and the IC component suction position is recognized while the IC component is being conveyed toward the mounting position, and the IC component is mounted on the glass panel. The IC components are accurately positioned and mounted with respect to the position.

A conventional device for mounting IC components on a glass panel will be described with reference to FIG. 5. Reference numeral 10 denotes a glass panel which constitutes a liquid crystal panel and is positioned at a predetermined position by a panel holding device 11. Reference numeral 12 is a stage for supporting the side of the positioned glass panel 10 where the IC component is to be mounted from below and receiving a pressing force.

Reference numeral 13 denotes an IC component supply means disposed at the rear portion of the panel holding device 11, which is I at a predetermined supply position.
Supply the C component 14. Reference numeral 15 denotes a mounting head that is movable in three axis directions by the robot unit 16 and sucks the IC component 14 at the supply position and conveys the IC component 14 to the IC component mounting position on the glass panel 10 for mounting. The mounting head 15 has an IC component 14
A tool 17 for sucking and pressing at a mounting position is provided, and a recognition camera 18 and a lighting unit 19 for recognizing the IC component 14 before suction and recognizing the position of the glass panel 10 are provided. Reference numeral 20 is a recognition camera provided between the supply means 13 and the stage 12, and 21 is a ring illumination means provided around the recognition camera.
Accurately recognize the suction position of.

As a panel holding device 11 for holding the glass panel 10 in such a mounting apparatus, as shown in FIG. 6, suction pads 23 are provided at four locations near the corners of the panel mounting surface 22. It is known that the glass panel 10 is adsorbed and held. The suction pad 23 has a circular shape in a plan view, and has a relatively shallow recess 25 having a circular shape, leaving a panel contact surface 23a having an appropriate width on its outer peripheral portion.
And a suction port 2 connected to a vacuum source at its center position
An opening 4 is generally used, and when the glass panel 10 is mounted on the panel mounting surface 22, it is brought into contact with and supported by the panel contact surface 23a of each suction pad 23. The upper surface opening of the recess 25 is closed, and the recess 25 becomes a decompressed space by vacuum exhausting from the suction port 24, and the glass panel 10 is held by being sucked by the suction pad 23.

[0006]

However, when the pressure in the decompression space is lowered in order to securely hold the glass panel 10 by suction so that the glass panel 10 is not displaced, the circular concave portion of the glass panel 10 is generated by the suction force. A large bending stress acts on the portion facing 25 toward the inside of the recess 25, and as shown in FIG. 3A, distortion occurs toward the inside of the recess 25. There is a problem that the liquid crystal panel may have poor quality.

Such a problem occurs not only in the case of a liquid crystal panel, but also in mounting on a printed circuit board or various electronic circuit boards which are remarkably miniaturized or holding the board during processing.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a panel holding device which can hold the panel securely without fear of positional displacement and which hardly causes distortion in the panel.

[0009]

In the panel holding device of the present invention, a suction pad is disposed on the panel mounting surface, and a recess connected to a vacuum source is formed on the upper surface of the suction pad and mounted. In a panel holding device configured to form a depressurized space closed by a panel, the concave portion of the suction pad is smaller than a value obtained by dividing the upper opening area of the depression pad by the diameter of the suction pad or about 1.5 times the maximum side length. It is characterized in that it is constituted by a groove-shaped recess having a width.

Preferably, a suction port connected to a vacuum source is formed in the central portion of the suction pad, and the recess of the suction pad is formed by three or more radial concave grooves radially extending from the suction port portion. Then, the concave portion of the suction pad is formed by a combination of the radial concave groove and the arcuate concave groove formed continuously from the radial concave groove.

[0011]

The opening area of the upper surface of the concave portion formed on the upper surface of the suction pad is a given condition determined by dividing the suction force required to hold the panel by the vacuum pressure. Since it is composed of a groove-shaped recess with a width smaller than the value obtained by dividing the opening area of the top surface by the diameter of the suction pad or approximately 1.5 times the maximum side length, it is bent to the portion facing the top opening of the panel by the suction force. Even when a load is applied, unlike the case where a circular or rectangular recess is formed, the upper opening edge spacing is small, so bending stress and strain are small, and the risk of quality defects due to panel deformation can be eliminated. Further, since the contact surface between the suction pad and the panel is formed in a wide area around the groove-shaped recess, a large frictional force can be surely obtained, and the panel can be held in a state in which displacement is surely prevented.

Further, the shape of the groove-shaped recess can be designed arbitrarily, but if a suction port is formed in the central portion of the suction pad and a radial recessed groove is formed from the suction port, the frictional force against the displacement of the panel will be reduced. It effectively works in the direction and has a great effect of preventing the positional displacement of the panel.

Further, by combining the radial concave groove with the circular concave groove, it is possible to secure a necessary upper surface opening area without increasing the size of the suction pad and to secure the above-mentioned operation and effect.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to.

In FIGS. 1 and 2, 1 is a panel holding device, and 1a is its panel mounting plate.

On the panel mounting plate 1a, suction pads 3 each having a circular planar shape are arranged near the four corners of the panel mounting surface 2 on the upper surface. A suction port 4 connected to a vacuum source (not shown) is formed on the upper surface of each suction pad 3, and four radial recessed grooves 5 are radially formed from the suction port 4. . The total length of the radial groove 5 is approximately 1.5 to 2 times the diameter of the suction pad 3, and therefore the width of the radial groove 5 is sufficient to securely hold the glass panel 10 given as a given condition. It is set to a value obtained by dividing the required opening area of the upper surface of the concave groove 5 by the total length of the radial groove 5.

In the above construction, the glass panel 10 is mounted on the panel mounting surface 2 of the panel holding device 1 and the inside of the radial concave groove 5 is connected to a vacuum source (not shown) through the suction port 4 for vacuum suction. Then, the upper surface opening of the radial concave groove 5 is closed in the mounted glass panel 10 to form a decompressed space, and the glass panel 10 is held by being sucked and fixed by the suction pad 3. At that time, as shown in FIG. 3B, the radial groove 5 formed on the upper surface of the suction pad 3 is different from the case where a circular or rectangular recess is formed as shown in FIG. Since the width is narrow, the glass panel 10 is attracted by the suction force.
Even if a bending load is applied to the part facing the upper surface opening, the bending stress and strain are small due to the short span between the opening edges,
It is possible to eliminate the risk of quality defects due to deformation of the glass panel 10.

Further, since the contact surface between the suction pad 3 and the glass panel 10 is formed in a wide area around the radial concave groove 5, a large friction force can be surely obtained and the glass panel 1
It can be held in a state in which the position shift of 0 is surely prevented. Further, since the radial concave grooves 5 are formed radially from the central portion of the suction pad 3, the frictional force against the displacement of the glass panel 10 effectively acts in all directions, and the displacement prevention effect of the glass panel 10 is high. .

In the illustrated example, the four radial concave grooves 5 are formed radially from the central portion of the suction pad 3, but the required opening area can be secured without increasing the groove width too much. In this case, the number may be three, or conversely five or more.

Next, another embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. 4 (a) to 4 (d) show various structural examples of this embodiment, the common feature of these embodiments is that the radial concave groove 5 and the arcuate concave groove 6 are combined. There is a point. That is, FIG. 4A shows each radial groove 5
4 (b), the arcuate groove 6 is continuously formed in the same direction from the tip of each of the radial grooves 5, and FIG. 4 (b) shows that the arcuate groove 6 formed continuously at the tip of each radial groove 5 is annularly continuous. 4 (c) is a circular annular groove 7, and in FIG. 4 (c), a pair of diametrical radial grooves 5 are formed by continuously forming arc-shaped grooves 6a each having a substantially semi-circular shape from the tip. The other pair of radial concave grooves 5 in the diametrical direction is formed by continuously forming arcuate concave grooves 6b each having a substantially semicircular shape from the intermediate portion.
(D) is a circular annular groove 7a, 7b formed by connecting the semicircular arcuate groove 6a, 6b of FIG. 4 (c) in an annular shape. The combination of the radial concave groove 5 and the circular concave groove 6, 6a, 6b can be designed arbitrarily other than these.

According to this embodiment, since the radial concave grooves 5 and the circular arc concave grooves 6, 6a, 6b are combined, the necessary upper surface opening area can be secured without increasing the size of the suction pad 3 and The effect can be secured.

Further, although the suction pad 3 has a circular shape in the above embodiment, it may have a rectangular shape. Further, in all of the above-described embodiments, the radial concave grooves 5 are formed on the upper surface of the suction pad 3, but the present invention defines the concave portion formed on the upper surface of the suction pad 3 as the opening area of the upper surface or the diameter of the suction pad 3. It is characterized in that it is constituted by a groove-shaped recess having a width smaller than a value obtained by dividing the maximum side length by about 1.5 times, and the shape and arrangement of the groove-shaped recess can be arbitrarily designed.

[0023]

According to the panel holding device of the present invention, as is apparent from the above description, the concave portion formed on the upper surface of the suction pad has an opening area of the upper surface which is approximately 1 of the suction pad diameter or the maximum side length. Since the groove-shaped recess has a width smaller than the value divided by 5 times, even if a bending load is applied to the portion facing the top opening of the panel due to the suction force, the gap between the top opening edges is small The stress and strain can be reduced, the risk of quality defects due to panel deformation can be eliminated, and since the contact surface between the suction pad and the panel is formed in a wide area around the groove-shaped recess, a large friction force can be secured. It is possible to obtain the effect that the position of the panel can be surely prevented and the state can be maintained.

Further, by forming the suction port in the central portion of the suction pad and forming the radial recessed groove from the suction port, the frictional force against the position shift of the panel effectively acts in all directions, and a high position shift prevention effect is obtained. can get.

Furthermore, if the radial concave groove is combined with the circular arc concave groove, the required upper surface opening area can be secured and the above-mentioned function and effect can be secured without increasing the size of the suction pad.

[Brief description of drawings]

FIG. 1 is a perspective view of a panel mounting plate in an embodiment of a panel holding device of the present invention.

FIG. 2 is an enlarged perspective view of a suction pad of the same embodiment.

FIG. 3 is a cross-sectional view of a panel suction state comparing a conventional example and an example.

FIG. 4 is a plan view of each configuration example of a suction pad in another embodiment of the panel holding device of the present invention.

FIG. 5 is a perspective view of a main part of an IC component mounting apparatus including a panel holding device.

FIG. 6 is a perspective view of a conventional panel holding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Panel holding device 2 Panel mounting surface 3 Suction pad 4 Suction port 5 Radial concave groove 6 Arc-shaped concave groove 6a Arc-shaped concave groove 6b Arc-shaped concave groove

Front Page Continuation (72) Inventor Masaru Ichihara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Shuichi Hirata 1006 Kadoma, Kadoma City, Osaka Prefecture (72) Invention Nobuhisa Watanabe 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A suction pad is disposed on a panel mounting surface, and a concave portion connected to a vacuum source is formed on an upper surface of the suction pad to form a depressurized space closed by the mounted panel. In the panel holding device described above, the concave portion of the suction pad is constituted by a concave groove having a width smaller than a value obtained by dividing the upper opening area of the suction pad by the diameter of the suction pad or approximately 1.5 times the maximum side length. Panel holding device. 2. A suction port connected to a vacuum source is formed in the center of the suction pad, and the recess of the suction pad is formed by three or more radial recessed grooves radially extending from the suction port. The panel holding device according to claim 1, wherein: 3. The panel holding device according to claim 2, wherein the concave portion of the suction pad is formed by a combination of a radial concave groove and an arcuate concave groove formed continuously from the radial concave groove.