JPH0632373B2 - Printed wiring board through hole filling device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a device for filling hole filling ink to protect plated through holes provided in a printed wiring board against an etching solution.

(Prior Art) A copper through-hole method is known as a typical method for manufacturing a printed wiring board having through-holes in which both sides of an insulating base material are electrically connected. In this manufacturing method, it is an essential requirement to protect the plated portion of the through hole from the etching solution.

As a method of temporarily protecting the through hole, two methods are generally used: a tenting method using a photosensitive dry film and a hole filling ink method of filling an etching resist ink in the through hole.

Here, the tinting method is said to have better accuracy and yield rate than the hole filling ink method, but since the photosensitive dry film is expensive, the hole filling ink method generally tends to be preferred.

By the way, as a method of filling the hole filling ink into the through hole, a method of pushing the hole filling ink into the through hole by a roll coater or a method of immersing a printed wiring board having a plated through hole in the hole filling ink liquid and passing through There is a method of filling the hole with the hole filling ink, and in any of the methods, it is necessary to scrape off the excess hole filling ink attached to the upper and lower surfaces of the printed wiring board with a squeegee after the filling.

(Problems to be Solved by the Invention) In the related art, most of the series of operations related to the filling of the hole-filling ink are manual operations, which are extremely inefficient.

The present invention has been made in view of the above points, and an object thereof is to carry a printed wiring board, fill hole filling ink into plated through holes, and remove excess hole filling ink adhering to both upper and lower surfaces. It is to realize a through-hole filling device for a printed wiring board that can be automatically and continuously performed smoothly.

(Means for Solving Problems) According to the present invention for solving the above problems, the upper and lower surfaces on both sides of a printed wiring board having a plated through hole and horizontally arranged are elastic by using upper and lower rolls. A printed wiring board holding and transporting means for horizontally transporting the printed wiring board by sandwiching the printed wiring board and rotating the roll, and the printed wiring board holding means for holding the printed wiring board in accordance with a width in a direction orthogonal to a transport direction of the printed wiring board. An interval movement adjusting means for moving and adjusting an interval of the roll of the carrying means in a direction orthogonal to the carrying direction of the printed wiring board, and the through hole in the through hole of the printed wiring board carried by the printed wiring holding and carrying means. A hole filling ink filling means for filling the hole filling ink from below in a state where the upper part of the hole is opened, and a hole filling ink for removing the hole filling ink adhering to the upper and lower surfaces of the printed wiring board. It is characterized in that it is composed of a means for removing burrs.

(Function) The printed wiring board is conveyed by sandwiching the both sides of the printed wiring board by the printed wiring board holding and conveying means, and the through hole is filled with the filling ink from the lower side by means of the filling ink filling means during the conveyance, and the printed wiring board is Excess ink adhering to both surfaces of is removed by the hole filling ink removing means.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a simplified side view of an embodiment of the present invention, and FIG. 2 is a simplified plan view. In these figures, 1 and 2 are belts for horizontally conveying a printed wiring board (not shown) having plated through holes. Numerals 3 to 32 are upper and lower rolls that constitute a means for holding and carrying the printed wiring board, have the same diameter, are arranged at equal intervals along the carrying direction, and rotate in the arrow direction. 33 is hole-filling ink, which is stored in an ink vat 34 arranged below the holding and conveying means. The hole filling ink 33 is supplied to the ink transfer roll 36 via a pickup roll 35 that rotates in the direction of the arrow. The ink transfer roll 36 does not have an independent rotation drive source,
By being pressed from above by 23, it rotates by frictional force. By the hole filling ink 33, the ink vat 34, the pickup roll 35, and the ink transfer roll 36,
A means for filling the hole filling ink 33 into the through hole of the printed wiring board is configured. Reference numerals 37 to 42 denote three sets of upper and lower rubber squeegees that constitute means for removing excess hole-filling ink attached to the upper and lower surfaces of the printed wiring board, and are fixed to squeegee holders 43 to 48, respectively. The squeegee group consisting of the upper squeegee 37 and the lower squeegee 40
The upper squeegee 3 is disposed between a set of rolls including the upper rolls 8 and 23 and the transfer roll 36 and a set of rolls including the upper rolls 9 and 24 and the lower rolls 10 and 25.
The set of squeegees 8 and the lower squeegee 41 includes a set of rolls including upper rolls 9 and 24 and lower rolls 10 and 25, and upper rolls 11 and 26 and lower rolls 12 and 27.
A pair of squeegees, which is arranged between a pair of rolls composed of and, and which is composed of an upper squeegee 39 and a lower squeegee 42, is composed of upper rolls 11 and 26 and lower rolls 12 and 27. Pair, upper roll 13, 28 and lower roll 14,
It is arranged between the group consisting of 29 and 29. The upper and lower rubber squeegees 37 to 42 are adjusted in such a manner that the horizontal squeegees have an angle of about 30 to 70 with the ends of the rubber squeegees facing each other in contact with each other. Also, these belts 1 and 2, upper and lower rolls 3 to 3
2. Ink transfer roll 36 and upper and lower rubber squeegee 37
The mounting heights of up to 42 are adjusted so that the horizontal lines 49 coincide with each other.

The upper and lower rolls 3 to 32 are symmetrically rotatably attached to roll drive unit main bodies 50 and 51 which are arranged in parallel in a direction orthogonal to the printed wiring board transport direction.
Both ends of the pick-up roll 35 and the ink transfer roll 36 are bearings 52, 53 and 54 outside the ink vat 33,
55 respectively. A motor 56 having a variable speed reduction mechanism is directly connected to the pickup roll 35 and is configured to rotate independently of the rolls 3 to 32. Both ends of the three sets of squeegee holders 43 to 48 are pedestals 5 arranged outside the roll driving unit main bodies 50 and 51.
7 and 58 are mounted independently of the roll drive unit main bodies 50 and 51, and are attached to the stage holders 43 to 48.
It has a structure that allows vertical movement, rotational movement, and fixing at any position.

By the way, there are various sizes of printed wiring boards, but in general, one of the sides is in the range of 200 mm to 500 mm. Therefore, in the apparatus according to the present invention, in order to fill the through holes while carrying the upper and lower rolls on both sides of the printed wiring board of various sizes by the upper and lower rolls, the roll drive unit main bodies 50 and 51 are filled. It is configured such that the facing interval can be adjusted according to the size of the printed wiring board.

That is, the roll drive unit main bodies 50, 51 are the bearing mounts 59, 6
The shaft 63 held at 0 and the shaft 64 held at the bearing mounts 61 and 62 are held in a penetrating state. The two shafts 63, 64 are provided with thread grooves (not shown) having an equal pitch so as to be opposite to each other from the central portion toward the respective end portions, and the roll driving unit main bodies 50, 51 are provided. A thread groove is formed on the inner peripheral surface of the through portion so as to be screwed into the thread groove of the shafts 63 and 64. For example, in FIG. 2, when the shaft of the roll drive unit main body 51 of the shaft 63 is a screw, the roll drive unit main body 50 side is a left screw, and the roll drive unit main body 51 side of the shaft 64 is a left screw. It is engraved so that it becomes a right-hand screw. Where shaft 6
When the handle 65 directly connected to one end of 3 is rotated to the right, the shaft 63 is also rotated to the right, but the shaft 64 is connected to the shaft 63 via the four bevel gears 66 to 69 and the shaft 70. It will rotate to the left.
Since the pitches of the thread grooves engraved on the shafts 63 and 64 are equal, the roll drive unit main body 5
0 and 51 will move in parallel in the direction away from each other by the same distance.

Further, when sandwiching the upper and lower both sides of the printed wiring board 71 by the upper and lower rolls 3 to 32, it is desirable to reduce the sandwiching width so as to reduce the influence on the portion which becomes the circuit. In the device according to (1), it is possible to sufficiently convey by sandwiching both sides from the end face by about 5 mm. Therefore, the rolls on both sides are respectively about 5 mm from the end faces on both sides of the printed wiring board 71.
Before the printed wiring board 71 is supplied, the handle 65 is rotated and adjusted so that the width between the rolls facing each other is about 10 mm narrower than the width of the printed wiring board 71 so as to be sandwiched. Then, the guide bar 72 is adjusted so that the printed wiring board 71 is sandwiched between the rolls facing each other with a width of about 5 mm. As a result, the printed wiring board 71 is
Belt 1 with one side in contact with the guide bar 72
By carrying the sheet by the step 2, it is always held and conveyed in a fixed position in the horizontal direction without meandering.

Since the printed wiring board 71 is held by elastically sandwiching the upper and lower sides on both sides of the horizontally arranged printed wiring board 71 with upper and lower rolls, the printed wiring board 71 is held.
As the printed wiring board 71, a printed wiring board 71 can be conveyed, and even if the printed wiring board 71 is warped or bent (a thin printed wiring board is likely to occur), the printed wiring board 71 does not come off the roll. It does not hinder the transportation. Therefore, the printed wiring board 71 can be stably transported.

FIG. 3 is a configuration diagram showing a specific example of the drive mechanism of the upper and lower roll sets. In FIG. 3, shafts 73 and 74 are arranged so as to penetrate through the roll driving unit main body 50, and the rolls 4 and 5 are fixed to one ends of these shafts, respectively, and gears 75 and 76 having the same diameter are respectively attached to the other ends. They are fixed so that they mesh with each other. Further, a sprocket 77 for receiving a driving force from a chain (not shown) is fixed to the shaft 73 to which the gear 75 is fixed. As a result, when the rotational force is transmitted to the sprocket 77 via the chain, the gears 75, 7
6 rotates in the opposite direction at the same speed, and the rolls 4 and 5 also rotate in the respective directions at the same speed according to the gears 75 and 76. As a result, the printed wiring board 71 whose sides are sandwiched by the rolls 4 and 5 with a width of about 5 mm is conveyed while being sandwiched by the rolls 4 and 5 when the rolls 4 and 5 rotate at the same speed. It will be. The shafts 73 and 74 are rotatably held by bearings 78 and 79, and the bearings 78 and 79 are fixed to bearing receivers 80 and 81. The bearing receiver 80 is pressed toward the bearing receiver 81 by the spring 82, and when the printed wiring board 71 is sandwiched, the entire bearing receiver 80 is displaced by the thickness of the printed wiring board 71 against the spring 82. Therefore, damage to the end of the printed wiring board 71 is prevented. On the other hand, the bearing receiver 81 is fixed to the roll driving unit main body 50 by a roller 83.

FIG. 4 is a configuration diagram showing a specific example of a roll drive mechanism of the entire apparatus.

Power for rotationally driving the rolls 3 to 32 is transmitted from a motor (not shown) to the spline shaft 84 via a variable speed reduction mechanism (not shown). The spline shaft 8
The power transmitted to the rolls 4 is, for example, via the chain 85, the upper roll 19, the lower roll 22, the upper roll 25, the lower roll 25, and the lower roll 2 mounted on the roll drive unit main body 51 side.
7, the lower roll 29, the upper roll 30, and the lower roll 32 are transmitted to the sprockets 86 to 93 fixed to the respective mounting shafts. Further, in order to make the drive transmission of the chain 85 smooth, the sprocket wheels 94 to 10 are attached to the roll drive body 51.
0 is rotatably arranged. The spline shaft 84 and the sprockets 86 to 93 are formed to have the same diameter, and rotate at the same speed according to the driving of the chain 85. Spline shaft 84 to chain 85
The rotary power transmitted to the sprockets 86 to 93 via the spline shaft 84 and the respective sprockets 86 to 93.
To the gears 101 to 107 that are fixed coaxially with the gears 108 to 107 that mesh with the gears 101 to 107.
It is transmitted to 114. Then, the rolls 18 to 32 attached to the roll driving unit main body 51 are rotated according to the respective gears 101 to 114, and the chain 85 moves in the direction of the arrow so that the printed wiring board moves the chain 85. The rolls 18 to 32 are held and conveyed along the direction. Spaces 115 to 117 are formed in the roll drive unit main body 51 to pass through the rubber squeegees 37 to 42 and the squeegee holders 43 to 48 for fixing to external mounts 57 and 58 independent of the roll drive unit main body 51. Has been done.

Although FIG. 4 shows the roll driving unit main body 51, a similar mechanism is incorporated in the other roll driving unit main body 50.

The operation of the apparatus according to the present invention configured as described above will be described with reference to FIG.

The printed wiring board having plated through holes to be filled is placed on the belts 1 and 2 and then the upper and lower rolls 3 to 7 and 18 to 22 rotating in the directions of the arrows sandwich both ends by about 5 mm. It is transported to the filling process. Ink bat 34
The hole-filling ink 33 stored therein is picked up by the pickup roll 35 and supplied to the transfer roll 36. Here, in order to always stably supply the hole filling ink 33 to the transfer roll 36, the peripheral speed of the pickup roll 35 is set to be higher than the peripheral speed of the transfer roll 36. The gap between the pickup roll 35 and the transfer roll 36 is set to 5 mm to 10 mm so that the hole filling ink 33 is supplied in an appropriate amount. Both ends of the printed wiring board are pressed against the transfer roll 36 by the upper rolls 8 and 23, and the through hole is filled with the hole filling ink 33 from below through the transfer roll 36. At this time, the transfer roll 36 exists only on the lower surface side of the printed wiring board 71, and the upper part of the through hole of the printed wiring board 71 is open. Therefore, the air in the through hole is promptly pushed upward by the hole filling ink 33 entering from below, and the air does not remain in the through hole. Hole filling ink 3
The printed wiring board filled with 3 is continuously conveyed by the upper rolls 9 to 17 and 24 to 32 which rotate in the direction of the arrow, and passes through the squeegee sets 37, 40, 38, 41 and 39, 42 to form both upper and lower surfaces. The extra hole-filling ink 33 adhered to is scraped off.

As described above, since the transfer roll 36 exists only on the lower surface side of the printed wiring board 71, a large amount of the hole filling ink 33 does not adhere to the upper surface of the printed wiring board 71. Therefore, a large amount of the hole filling ink 33 on the upper surface of the printed wiring board 71 wraps around to the lower surface of the printed wiring board 71 during the removal work and is filled with the hole filling ink 33.
It does not happen that it hinders the good scraping.
That is, the hole filling ink 33 can be removed smoothly.

Here, the ink 33 for filling the hole is filled in the through hole of the printed wiring board.
In order to stably fill the printed wiring board, it is always necessary to sandwich two or more side surfaces of the printed wiring board at two or more places. If there is only one sandwich on each side, the printed wiring board becomes unstable in the vertical direction, which causes meandering. Therefore, in the present embodiment, the length of the printed wiring board in the carrying direction is set to be twice or more the roll arrangement pitch.

The hole filling ink 33 may be any of thermosetting type hole filling ink and ultraviolet ray hardening type hole filling ink which are commercially available.

The number of rubber squeegees does not have to be three, and at least two is sufficient.

(Effects of the Invention) As described above, according to the present invention, the upper and lower surfaces on both sides of a horizontally arranged printed wiring board are elastically sandwiched by upper and lower rolls, and the rolls are rotated to perform the printing. Since the wiring board is transported in the horizontal direction, the printed wiring board can be transported well, and in the through holes of the printed wiring board,
Since the hole filling ink is filled from below with the upper part of the through hole being opened, the filling of the hole filling ink into the plated through hole and the removal of the excess hole filling ink adhering to the upper and lower surfaces are also excellent. As a result, it is possible to realize a through-hole filling device for a printed wiring board that can automatically, continuously, and smoothly carry, fill, and remove.

[Brief description of drawings]

FIG. 1 is a simplified side view of an embodiment of the present invention, and FIG. 2 is a first side view.
FIG. 3 is a schematic plan view of the embodiment shown in FIG. 3, FIG. 3 is a configuration diagram showing a specific example of a drive mechanism for an upper and lower roll set, and FIG. 4 is a configuration diagram showing a specific example of a roll drive mechanism for the entire apparatus. 1, 2 ... Belt, 3 to 32 ... Roll 33 ... Hole filling ink, 34 ... Ink bat 35 ... Pickup roll 36 ... Ink transfer roll 37 to 42 ... Rubber squeegee 43 to 48 ... Squeegee holder 49 ...... Horizontal line 50,51 ...... Roll driving unit main body 52 to 55 ...... Bearing, 56 ...... Motor 57,58 ...... Mounting stand, 59 to 62 ...... Bearing mount 63 to 64 ...... Shaft, 65 ...... Handle 66 to 69 ... Bevel gear, 70 ... Shaft 71 ... Printed wiring board, 72 ... Guide bar 73, 74 ... Shaft, 75, 76 ... Gear 77 ... Sprockets 78, 79 ... Bearings 80, 81. Bearing 82 ... Spring, 83 ... Bolt 84 ... Spline shaft 85 ... Chain 86-100 ... Sprockets 101-114 ... Gear 11 5-117 ... space

Claims (4)

[Claims] 1. A printed wiring board which has plated through holes and is horizontally arranged. The upper and lower sides on both sides of the printed wiring board are elastically sandwiched by upper and lower rolls, and the rolls are rotated to horizontally position the printed wiring board. And a printed wiring board holding and conveying means for conveying the printed wiring board in a direction, and a width in a direction orthogonal to the conveying direction of the printed wiring board, and orthogonal to the conveying direction of the printed wiring board of the roll of the printed wiring board holding and conveying means. A gap movement adjusting means for moving and adjusting a gap in a direction, and a filling hole filling ink from below in a state in which an upper portion of the through hole is opened in a through hole of the printed wiring board conveyed by the printed wiring holding and conveying means. A hole filling ink filling means for filling and a hole filling ink removing means for removing the hole filling ink adhering to the upper and lower surfaces of the printed wiring board. Through hole filling device. 2. A printed wiring board holding and conveying means is constituted by a plurality of upper and lower rolls so as to sandwich both sides of the printed wiring board at at least two places while rotating at a constant speed. The through hole filling device for a printed wiring board according to claim 1. 3. The through-hole filling device for a printed wiring board according to claim 1, wherein the filling ink filling means is a roll which rotates at a speed equal to the conveying speed of the printed wiring board. . 4. The through hole of a printed wiring board according to claim 1, wherein the hole filling ink removing means is a rubber squeegee arranged so as to sandwich the conveyed printing board from both upper and lower sides. Hole filling device.