JPH03217073A - Smooth coater for conductor ink - Google Patents

Abstract

PURPOSE:To prevent a conductor ink from being adhered onto the rear surface of a printed circuit board and short-circuiting failure of the printed circuit pattern from occurring by providing a screening plate which is in contact with the side part of a holder at the outside of the holder of a rotary table. CONSTITUTION:In a conductor ink smooth coater with a motor 2 which is mounted to a main unit 1, a rotary table 3 which is driven by that motor 2, and a holder 4 for retaining a printed circuit board 6 which is provided on that rotary table 3, a screening plate 7 which is in contact with the side part of the holder 4 is provided at the outside of the holder 4 of the rotary table 3. For example, the cylindrical screening plate 7 which is mounted to the rotary table 3 so that it can be inserted and extracted is provided at the outside of the holder 4 so that it is in contact with both side parts 4a of the holder 4, thus preventing extra conduction ink scattered from the printed circuit board from being adhered onto the rear surface of the printed circuit board due to centrifugal force since no high-speed wind is generated between the printed circuit board and the screening plate which are retained by the holder even if the rotary table is allowed to rotary at high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a conductive ink smoothing application device for smoothly applying paste-like conductive ink to the inner surface of a through hole of a circuit board.

[Conventional technology]

When manufacturing a circuit board, a through hole with a diameter of, for example, 0.1 to 2 mm is provided in a substrate made of alumina, etc., and conductive ink in the form of Paste I is applied to the through hole portion by screen printing, and the printing surface is A through hole is formed by vacuum suction from the opposite side.

However, in this case, the conductive ink cannot be applied smoothly into the through hole. Therefore, a conductive ink smoothing application device for smoothly applying paste-like conductive ink to the inner surface of a through hole of a circuit board has been considered.

Figure 3 shows a conventional conductor ink smoothing coating device (patent application 1986-
159307), and FIG. 4 is a schematic plan view as well. In the figure, l is the main body of the conductive ink smooth coating device, 2 is a motor attached to the main body l, 3 is a rotary table driven by the motor 2, 4 is a holder attached to the rotary table 3, and 5 is the rotary table 3
The shielding plate 5 is located outside the holder 4, that is, on the side opposite to the rotation center point of the rotary table 3 from the holder 4, and the shielding plate 5 is installed parallel to the holder 4. There is. 6 is a circuit board held by the holder 4.

2. In this conductive ink smooth coating device, paste-like conductive ink is applied to the through-hole portion by screen printing, and the circuit board 6 is held in the holder 4 with the printed surface facing inside, that is, toward the center of rotation of the rotary table 3. In this state, when the rotary table 3 is rotated at high speed by the motor 2, the conductive ink starts to flow evenly along the inner surface of the through hole by the centrifugal jet, and the conductive ink is smoothly applied to the inner surface of the through hole. In addition, since the shielding plate 5 is provided on the outside of the holder 4, excess conductive ink blown away from the circuit board 6 by centrifugal force will adhere to the shielding plate 5, and the shielding plate 5 is attached to the rotary table 3. Since the shielding plate 5 is also rotating, the conductive ink adhering to the shielding plate 5 is fixed by centrifugal force.

[Problem to be solved by the invention]

However, in such a conductive ink smooth coating device, when the rotary table 3 is rotated at high speed, a high-speed wind is generated between the circuit board 6 held by the holder 4 and the shielding plate 5. The excess conductive ink that has flown from the rotary table 3 flows in the circumferential direction of the rotary table 3, and the conductive ink adheres to the back surface of the circuit board 6, causing a short circuit failure in the pattern of the circuit board 6.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a conductive ink smooth coating device that does not cause short-circuit defects in patterns of circuit boards.

[Means to solve the problem]

To achieve this object, the present invention provides a conductive ink smoothing plate having a motor attached to a main body, a rotary table driven by the motor, and a holder provided on the rotary table to hold a circuit board. In the coating device, a shield plate is provided on the outside of the holder of the rotary table and is in contact with a side portion of the holder.

[Function] In this conductive ink smooth coating device, since the shielding plate is in contact with the side of the holder, even if the rotary table is rotated at high speed, there will be a high speed gap between the circuit board held by the holder and the shielding plate. Wind does not occur 4.

〔Example〕

FIG. 1 is a schematic front view showing a conductor ink smooth coating device according to the present invention, and FIG. 2 is a schematic plan view thereof. In the figure, 7 is a cylindrical shield plate that is detachably attached to the rotary table 3. The shield plate 7 is provided on the outside of the holder 4, and the shield plate 7 is in contact with both sides 4a of the holder 4. There is.

In this conductive ink smooth coating device, since the shielding plate 7 is in contact with both sides 4a of the holder 4, even if the rotary table 3 is rotated at high speed, the circuit board 6 held by the holder 4 and the shielding plate 5 are Since high-speed wind is not generated during the process, excess conductive ink blown away from the circuit board 6 by centrifugal force does not flow in the circumferential direction of the rotary table 3, and the conductive ink adheres to the back surface of the circuit board 6. Therefore, short-circuit defects in the pattern of the circuit board 6 do not occur. Moreover, since the shielding plate 7 is detachably attached to the rotary table 3, by removing the shielding plate 7 from the rotary table 3, the conductive ink deposited on the shielding plate 7 can be easily recovered.

In addition, in the second embodiment, the cylindrical shielding plate 7 is used as the shielding plate, but a polygonal shielding plate may also be used. Further, in the above embodiment, a common shielding plate 7 is provided for each holder 4, but a shielding plate may be provided for each holder. Further, in the above embodiment, both sides 4a of the holder 4 and the shielding plate 7 are brought into contact with each other, but one side of the holder and the shielding plate may be brought into contact with each other.

[Effects of the Invention] As explained above, in the conductive ink smooth coating device according to the present invention, even if the rotary table is rotated at high speed, high-speed wind is generated between the circuit board held by the holder and the shielding plate. Therefore, the excess conductive ink blown away from the circuit board by centrifugal force does not flow in the circumferential direction of the rotary table, and the conductive ink does not adhere to the back of the circuit board, thereby preventing short circuit defects in the circuit board pattern. never occurs. As described above, the effects of this invention are remarkable.

[Brief explanation of drawings]

FIG. 1 is a schematic front view showing a conductive ink smooth coating device according to the present invention, FIG. 2 is a schematic plan view, and FIG. 3 is a schematic front view showing a conventional conductive ink smooth coating device. FIG. l...Main body 2...Motor 3...Rotary table 4...Holder 6...Circuit board 7...Shielding plate

Claims (1)

[Claims] 1. In a conductive ink smooth coating device having a motor attached to a main body, a rotary table driven by the motor, and a holder provided on the rotary table to hold a circuit board, the outer side of the holder of the rotary table A conductive ink smoothing coating device characterized in that a shielding plate is provided in contact with a side portion of the holder.