JPH11204929A - Solder printing apparatus and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable reliable printing of cream solder by providing a rotating means above a board mounted in the apparatus, moving means freely movable along the board, and rotary shaft which is erected and coupled with the rotating means with a knife fixed to the shaft. SOLUTION: A solder printing mask 25 is stuck to a board 23. In the apparatus body 21 a longitudinal screw 26 and longitudinal shaft 29 are disposed with their lengths pointing the longitudinal direction Y at the ends of the board 23 in the transversal direction X, cream solder 53 is held inside an inclined squeegee (knife) 51, a longitudinal moving mechanism is composed of the longitudinal screw 27, a pulse motor 35 and a longitudinal support 37, the longitudinal screw 27 rotates to move the support 37 to specified position in the longitudinal direction y by the control of the pulse motor 35, and by controlling the pulse motors 35, 43, 47 at once, the squeegee 51 can slide always perpendicularly in the horizontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a solder printing apparatus and a solder printing method for printing cream solder on a substrate via a mask arranged on the substrate.

[0002]

2. Description of the Related Art In recent years, bare chips have come to be mounted on a substrate on which surface mount components are mounted by using a chip-on-board mounting technology in order to achieve high-density mounting of electronic components. I have. In such a case, solder printing is performed only on the pads of the surface mount component, avoiding the bare chip mounting area, as described below.

[0003] First, as shown in FIG. 12 and FIG. 13, a mask 5 for solder printing is disposed in close contact with a predetermined position on a substrate 3 on which the bare chip 1 is mounted. In the position corresponding to the bare chip 1 of the mask 5,
An opening 5a is formed, and a box-shaped projection 7 projecting toward the opposite side of the substrate 3 is formed in the opening 5a.

[0004] In the mask 5, printing holes 5b for solder printing are formed at positions corresponding to the pads 3a for surface mounting components formed on the substrate 3. Next, as shown in FIG. 14, a long squeegee 9 having elasticity is arranged at one end 5c of the mask 5 along a direction perpendicular to the printing direction P. Also, on the mask 5, the protrusion 7 of the squeegee 9
The cream solder 11 is placed on the side.

[0005] Thereafter, as shown in FIG. 15, the squeegee 9 is slid in the printing direction P in contact with the mask 5, and the cream solder 11 moves on the mask 5 with this sliding. At this time, the cream solder 11 is filled 13 into the printing holes 5b on the mask 5. Next, as shown in FIG. 16, the squeegee 9 is slid to the other end 5d of the mask 5,
The mask 5 is separated from the substrate 3.

Then, the cream solder 11 filled 13 in the printing hole 5b is spread on the substrate 3, and the solder printing is completed.

[0007]

However, the substrate 3
When the cream solder 11 is printed on the mask 5 by the above-described solder printing, since the box-shaped protrusion 7 is formed in the opening 5a of the mask 5, as shown in FIG. There is a problem that the squeegee 9 floats when passing through the protrusion 7.

For this reason, as shown in FIG.
A non-contact area A where the squeegee 9 does not come into contact occurs, and in this non-contact area A, the cream solder 11 is
There is a problem that the solder printing on the substrate 3 cannot be performed because the filling 13 cannot be performed. In addition, since the cream solder 11 cannot be printed on the non-contact area A, components cannot be mounted in this area, and there is a problem that the mounting efficiency of the components cannot be improved.

Further, recently, as shown in FIG. 19 and FIG. 20, two squeegees 9 are opposed to each other.
a, 9b, and a solder printing apparatus capable of printing the cream solder 11 both during reciprocating movement of the squeegee 9 has been developed. In this solder printing apparatus, the cream solder 11 is arranged between the squeegees 9a and 9b.

When the squeegee 9 is slid in the printing direction P1, the squeegee 9a located in the printing direction P1 is lifted off the mask 5 as shown in FIG. Is printed on the substrate 3. When the squeegee 9 slides in the printing direction P2, as shown in FIG. 20, the squeegee 9b located in the printing direction P2 is lifted off the mask 5 and
Thus, the cream solder 11 is printed on the substrate 3.

However, even in such a solder printing apparatus, when the squeegee 9b or the squeegee 9a sliding on the mask 5 passes through the projection 7, the squeegee 9
Since the b or the squeegee 9a floats, there is a problem that the non-contact area A is generated as shown in FIG. The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a solder printing apparatus and a solder printing method capable of reliably printing cream solder on a substrate.

[0012]

According to a first aspect of the present invention, there is provided a solder printing apparatus, wherein a mask for solder printing is arranged on a substrate mounted in the apparatus main body, and the mask is slid on the mask in the apparatus main body. In a solder printing apparatus for arranging a moving spatula member and printing cream solder on the substrate via the mask, rotating means disposed above the substrate; and rotating the rotating means along the substrate. And a rotating shaft that is connected to the rotating means with its axial direction directed up and down and to which the spatula member is fixed.

According to a second aspect of the present invention, in the solder printing apparatus according to the first aspect, the moving means includes a vertical moving mechanism that moves in a vertical direction of the substrate, and a moving mechanism that moves in a horizontal direction of the substrate. And a lateral moving mechanism that moves. The solder printing apparatus according to claim 3 is the solder printing apparatus according to claim 2, wherein the vertical movement mechanism includes a vertical screw member that turns the shaft length in the vertical direction, and a vertical rotation mechanism that rotates the vertical screw member. A vertical support member that is screwed into the screw portion of the vertical screw member and that moves in the vertical direction by rotation of the vertical screw member, wherein the horizontal movement mechanism directs the axial length in the horizontal direction A lateral screw member, a lateral rotation mechanism that rotates the lateral screw member, and a lateral support member that is screwed into the threaded portion of the lateral screw member and that moves in the lateral direction by the rotation of the lateral screw member. It is characterized by having.

According to a fourth aspect of the present invention, there is provided a solder printing apparatus according to any one of the first to third aspects, wherein the spatula member is curved with both ends in the horizontal direction in the sliding direction. It is characterized by becoming. A solder printing apparatus according to claim 5, wherein the solder printing apparatus according to any one of claims 1 to 3, wherein the bending portions are provided at both ends in the horizontal direction of the spatula member in a sliding direction. Is formed.

According to a sixth aspect of the present invention, there is provided a solder printing method, wherein a mask for solder printing is arranged on a substrate mounted in the apparatus main body, and a spatula member sliding on the mask is arranged in the apparatus main body. In the solder printing method for printing cream solder on the substrate via the mask, the horizontal direction of the spatula member is oriented at right angles to the sliding direction, and the spatula member is freely moved. Is characterized in that cream solder is printed by sliding on the substrate.

(Function) In the solder printing apparatus of the first aspect,
Since the rotating means disposed above the substrate is freely moved by the moving means, the spatula member fixed to the rotating shaft of the rotating means always faces in a predetermined direction with respect to the moving direction, and is placed on the mask. Can be freely slid. For this reason, the cream solder is always held in the direction of movement of the spatula member, and the solder is reliably printed on the substrate.

According to the second aspect of the present invention, since the moving means is constituted by the vertical moving mechanism and the horizontal moving mechanism moving in the vertical and horizontal directions of the substrate, the moving of the vertical moving mechanism and the horizontal moving mechanism is achieved. , The spatula member is freely slid on the mask. According to the third aspect of the present invention, the vertical and horizontal screw members are rotated by the vertical and horizontal rotation mechanisms, so that the vertical and horizontal support members screwed to the respective screw portions move. By converting the rotational motion into a linear motion, the vertical support member and the horizontal support member can be easily moved.

According to the fourth aspect of the present invention, since the spatula member is curved with the both ends in the horizontal direction in the sliding direction, the cream solder is securely held by the spatula member sliding on the mask. Printed in state. In the solder printing apparatus according to the fifth aspect, since the bent portions that bend in the sliding direction are formed at both ends of the spatula member in the horizontal direction, the cream solder is surely attached to the spatula member that slides on the mask. Is printed in the state where is held.

According to the solder printing method of the present invention, the spatula member slides freely with the horizontal direction of the spatula member directed perpendicular to the sliding direction, so that the spatula member securely holds the cream solder. However, it is slid only in a predetermined area on the mask.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show a first embodiment (corresponding to claims 1 to 4, and 6) of a solder printing apparatus and a solder printing method according to the present invention. In the figure, a mounting portion 21 a on which a substrate 23 is mounted is formed in the apparatus main body 21.

On the substrate 23, a mask 2 for solder printing is provided.
5 are closely arranged. In the device body 21,
On both sides of the substrate 23 in the horizontal direction X, a vertical screw member 27 and a vertical axis member 29 are arranged with the axial length directed in the vertical direction Y of the substrate 23. Bearing members 31 are provided at both ends of the vertical screw member 27.
Is fixed, and the vertical screw member 27 is rotatably supported by the bearing member 31.

One of the bearing members 31 is a form of a vertical rotation mechanism, and is a pulse motor 3 that rotates a vertical screw member 27.
5 is fixed. A support member 33 is fixed to both ends of the vertical axis member 29, and the vertical axis member 29 is supported by the support member 33. A vertical support member 37 extending along the horizontal direction X is arranged between the vertical screw member 27 and the vertical axis member 29.

On the vertical screw member 27 side of the vertical support member 37,
A moving block 37a is formed. Moving block 3
A screw hole 37b penetrating in the vertical direction Y is formed in 7a, and the vertical screw member 27 is screwed into the screw hole 37a. On the vertical support member 37 side of the vertical support member 37,
A moving block 37c is formed.

The moving block 37c has a through hole 37d penetrating along the vertical direction Y, and the longitudinal member 29 is slidably inserted into the through hole 37d. A horizontal screw member 39 extending in the horizontal direction X is disposed on the vertical support member 37. A horizontal shaft member 41 is disposed on the vertical support member 37 at a predetermined distance from the horizontal screw member 39 and in parallel with the horizontal screw member 39.

The vertical support member 37 has a slot 3 extending along the horizontal direction X between the horizontal screw member 39 and the horizontal shaft member 41.
7e are formed. Bearing members 31 are fixed to both ends of the horizontal screw member 39, and the horizontal screw member 39 is
It is rotatably supported by. One side of the bearing member 31 is a form of a lateral rotation mechanism, and a pulse motor 43 that rotates the horizontal screw member 39 is fixed.

A support member 33 is fixed to both ends of the horizontal shaft member 41, and the horizontal shaft member 41 is supported by the support member 33. A horizontal support member 45 extending along the vertical direction Y is arranged between the horizontal screw member 39 and the horizontal shaft member 41. On the side of the horizontal screw member 39 of the horizontal support member 45, a moving block 45a is formed.

The moving block 45a is formed with a screw hole 45b penetrating in the horizontal direction X, and the horizontal screw member 39 is screwed into the screw hole 45a. A moving block 45c is formed on the side of the horizontal shaft member 41 of the horizontal support member 45. The moving block 45c is formed with a through hole 45d penetrating along the horizontal direction X, and the horizontal shaft member 41 is slidably inserted into the through hole 45d.

On the lateral support member 45, a pulse motor 47, which is one form of a rotating means, is fixed. The pulse motor 47 has a rotating shaft 4 protruding toward the mask 25 side.
9 is fixed.

At the lower end of the rotating shaft portion 49, an elastic squeegee 51 made of, for example, urethane resin or the like is fixed at a position where it slides on the mask 25. The squeegee 51 is formed such that both ends in the horizontal direction are curved. Further, the squeegee 51 is inclined at a predetermined angle R with respect to the mask 25 as shown in FIG.
It is fixed to.

In this embodiment, the angle R is set to 60 degrees. Then, the structure is such that the cream solder 53 is held inside the inclined squeegee 51. In this embodiment, the vertical movement mechanism includes a vertical screw member 27, a pulse motor 35, and a vertical support member 37, and the horizontal movement mechanism includes a horizontal screw member 39, a pulse motor 43, and a horizontal support member 45. .

The vertical moving mechanism and the horizontal moving mechanism constitute one form of moving means. In the above-described solder printing apparatus, the vertical screw member 27 is rotated by the control of the pulse motor 35, and the vertical support member 3 is rotated with this rotation.
7 is moved to a predetermined position in the vertical direction Y.

Further, under the control of the pulse motor 43, the horizontal screw member 39 is rotated, and with this rotation, the horizontal support member 45 is moved in the horizontal direction X to a predetermined position.
By controlling the pulse motors 35 and 43 simultaneously,
The squeegee 51 is slid to an arbitrary position on the mask 25 through an arbitrary course. Further, the pulse motor 47
, The squeegee 51 is rotated so as to face a predetermined direction.

By simultaneously controlling the pulse motors 35, 43 and 47, the squeegee 51 can always be slid in the horizontal direction at right angles to the sliding direction.
Then, as described below, the squeegee 51 is held on the mask 25 while holding the cream solder 53, and the cream solder 53 is printed on the substrate 23. That is, first, as shown in FIG. 5, a mask 25 having a printing hole 25a is formed on a substrate 23 on which a bare chip 55 is mounted.
Are arranged in close contact.

A projection 25b is formed on the mask 25 at a position corresponding to the bare chip 55. Next, the squeegee 51 is arranged at a predetermined position on the mask 25, and the cream solder 53 is arranged on the printing direction P side, which is the sliding direction of the squeegee 51. Next, as shown in FIG. 6, the squeegee 51 is slid along the periphery of the protruding portion 25b, and the printing hole 25a of the mask 25 is filled with the cream solder 53.
Is done.

Further, as shown in FIG.
Is slid on the mask 25, and the squeegee 51 is
It is stopped at a position where it has made almost one round around 5b. Thereafter, the mask 25 is separated from the substrate 23, and the printing holes 25a are formed.
Is spread on the substrate 23, and the solder printing is completed. In the solder printing apparatus configured as described above, the squeegee 51 is fixed to the rotating shaft 49 of the pulse motor 47 that moves freely under the control of the pulse motors 35 and 43. The mask 25
It can slide freely on the top.

Therefore, the cream solder 53 can always be held in the sliding direction of the squeegee 51, and the solder can be printed on the substrate 23 reliably. In addition, a vertical movement mechanism (the vertical screw member 27, which moves the pulse motor 43 in the vertical direction Y and the horizontal direction
A pulse motor 35, a vertical support member 37) and a horizontal moving mechanism (a horizontal screw member 39, a pulse motor 43, a horizontal support member 4).
5), the squeegee 51 can be easily slid freely on the mask 25 by combining the movement of the vertical movement mechanism and the movement of the horizontal movement mechanism.

Further, the pulse motors 35 and 43
By rotating the vertical screw member 27 and the horizontal screw member 39, the vertical support member 3 screwed into each of the screw portions 27a, 39a
7 and the horizontal support member 45 are moved, so that the vertical support member 37 and the horizontal support member 45 can be easily moved by converting the rotational motion into a linear motion. Since the squeegee 51 is curved with both ends in the horizontal direction facing the sliding direction, the squeegee 5 that slides freely on the mask 25 is formed.
First, it is possible to reliably hold and print the cream solder 53.

Further, since the horizontal direction of the squeegee 51 is oriented at right angles to the sliding direction, the squeegee 51 is slid freely, so that the cream solder 53 is securely held and the squeegee 51 is placed on the mask 25. It can slide only in a predetermined area. FIG. 8 shows a second embodiment of the solder printing apparatus according to the present invention.
(Corresponding to claims 1 to 4) is shown.

In this embodiment, a horizontal screw member 39 and a horizontal shaft member 41 are arranged on both sides in the vertical direction Y on the mounting portion 21a in the apparatus main body 21. Between the horizontal screw member 39 and the horizontal shaft member 41, a long horizontal support member 45 having a long hole 45e along the vertical direction Y is disposed. The rotation shaft 49 of the pulse motor 47 is inserted through an intersection A between the long hole 37 e of the vertical support member 37 and the long hole 45 e of the horizontal support member 45.

A squeegee 51 is fixed to the lower end of the rotating shaft 49. Then, as the vertical support member 37 and the horizontal support member 45 move, the intersection A moves.
The squeegee 51
Are configured to slide freely on the mask 25.
In this embodiment, the same effects as those of the first embodiment can be obtained.

FIG. 9 shows a third embodiment (corresponding to claim 5) of a solder printing apparatus according to the present invention. In this embodiment, at both ends in the horizontal direction of the squeegee 51, bent portions 51a bent in the printing direction P are formed.
In this embodiment, at both ends of the squeegee 51 in the horizontal direction,
Folding portion 51 that bends in printing direction P, which is the sliding direction
Since a was formed, similarly to the above-described first embodiment,
The squeegee 51 that slides freely on the mask 25 can reliably hold the cream solder 53 for printing.

In the first embodiment described above, the example in which the cream solder 53 is printed on the substrate 23 by sliding the squeegee 51 along the periphery of the protrusion 25b of the mask 25 has been described. The present invention is not limited to such an embodiment. For example, as shown in FIG.
Using a general flat mask 25, the squeegee 5
The cream solder 53 may be printed on the substrate 23 by sliding 1 in a U-shape.

In the first embodiment described above, the example in which the cream solder 53 is printed on the substrate 23 by sliding the squeegee 51 along the periphery of the protrusion 25b of the mask 25 has been described. The present invention is not limited to such an embodiment. For example, as shown in FIG.
A squeegee 51 is used by using a general flat mask 25.
May be spirally slid to print the cream solder 53 on the substrate 23.

[0044]

According to the first aspect of the present invention, the spatula member is fixed to the rotating shaft of the rotating means which can freely move by the moving means, so that the spatula member always moves in a predetermined direction with respect to the moving direction. And can slide freely on the mask. For this reason, the cream solder can always be held in the moving direction side of the spatula member, and the solder can be reliably printed on the substrate.

In the solder printing apparatus according to the second aspect, the moving means is constituted by the vertical moving mechanism and the horizontal moving mechanism moving in the vertical and horizontal directions of the substrate. By combining them, the spatula member can be easily slid freely on the mask. According to the third aspect of the present invention, since the vertical screw member and the horizontal screw member are rotated by the vertical rotation mechanism and the horizontal rotation mechanism, the vertical support member and the horizontal support member screwed to each screw portion are moved. By converting the rotary motion into a linear motion, the vertical support member and the horizontal support member can be easily moved.

In the solder printing apparatus according to the fourth aspect, since the spatula member is curved with the both ends in the horizontal direction directed in the sliding direction, the cream solder is securely held by the spatula member slidably on the mask. Can be printed. Claim 5
In the solder printing equipment of the above, at both ends of the spatula member in the horizontal direction,
Since the bent portion that bends in the sliding direction is formed, it is possible to reliably hold and print the cream solder on the spatula member that slides freely on the mask.

In the solder printing method according to the sixth aspect, the spatula member is slid freely with the horizontal direction of the spatula member directed at right angles to the sliding direction. The member can be slid only to a predetermined area on the mask.

[Brief description of the drawings]

FIG. 1 is a top view showing a first embodiment of a solder printing apparatus and a solder printing method of the present invention.

FIG. 2 is a side view showing a state where FIG. 1 is viewed from a lateral direction.

FIG. 3 is a side view showing a state where FIG. 1 is viewed from a vertical direction.

FIG. 4 is a sectional view showing details of a squeegee.

FIG. 5 is a top view showing a state where a squeegee is arranged on a mask.

FIG. 6 is a top view showing a state in which a squeegee is sliding along the periphery of a protrusion of the mask.

FIG. 7 is a top view showing a state in which cream solder is printed on a substrate by sliding a squeegee.

FIG. 8 is a top view showing a second embodiment of the solder printing apparatus of the present invention.

FIG. 9 is a top view showing a third embodiment of the solder printing apparatus of the present invention.

FIG. 10 is a top view showing an example in which cream solder is printed on a substrate by sliding a squeegee in a U-shape.

FIG. 11 is a top view showing an example in which cream solder is printed on a substrate by spirally sliding a squeegee.

FIG. 12 is a cross-sectional view showing a conventional solder printing mask.

FIG. 13 is a top view of FIG.

FIG. 14 is a top view showing a state in which cream solder is printed using a conventional solder printing apparatus.

FIG. 15 is a top view showing a state where cream solder is printed.

FIG. 16 is a top view showing a state where printing of cream solder is completed.

FIG. 17 is a sectional view showing a state in which the squeegee is deformed.

FIG. 18 is a top view showing a non-contact area.

FIG. 19 is a cross-sectional view showing a state in which a squeegee is sliding in one direction in another conventional solder printing apparatus.

FIG. 20 is a cross-sectional view showing a state in which a squeegee is sliding in a reverse direction in another conventional solder printing apparatus.

[Explanation of symbols]

 Reference Signs List 21 apparatus main body 23 substrate 25 mask 27 vertical screw member (vertical moving mechanism) 27a screw portion 35 pulse motor (vertical rotating mechanism, vertical moving mechanism) 37 vertical supporting member (vertical moving mechanism) 39 horizontal screw member (horizontal moving mechanism) 39a Screw part 43 Pulse motor (lateral rotation mechanism, lateral movement mechanism) 45 Horizontal support member (lateral movement mechanism) 47 Pulse motor (rotation means) 49 Rotation shaft part 51 Squeegee (spatula member) 51a Bending part P Printing direction (sliding) Direction) X horizontal direction Y vertical direction

Claims (6)

[Claims] 1. A mask for solder printing is arranged on a substrate mounted in an apparatus main body, and a spatula member that slides on the mask is arranged in the apparatus main body. A solder printing apparatus for printing cream solder on the substrate, a rotating means disposed above the substrate, a moving means for freely moving the rotating means along the substrate, and an axial length direction. A rotary shaft portion connected to the rotating means upward and downward, to which the spatula member is fixed. 2. The solder printing apparatus according to claim 1, wherein the moving means includes: a vertical moving mechanism that moves in a vertical direction of the substrate; a horizontal moving mechanism that moves in a horizontal direction of the substrate; A solder printing apparatus comprising: 3. The solder printing apparatus according to claim 2, wherein the vertical movement mechanism includes: a vertical screw member for turning the shaft length in the vertical direction; a vertical rotation mechanism for rotating the vertical screw member; and the vertical screw member. And a vertical support member that is screwed into the screw portion of the vertical screw member and moves in the vertical direction by rotation of the vertical screw member. The horizontal movement mechanism includes a horizontal screw member that directs an axial length in the horizontal direction. And a lateral rotation mechanism that rotates the lateral screw member; and a lateral support member that is screwed to the threaded portion of the lateral screw member and that moves in the lateral direction by rotation of the lateral screw member. A solder printing apparatus. 4. The solder printing apparatus according to claim 1, wherein the spatula member is curved with both ends in a horizontal direction directed in a sliding direction. Solder printing equipment. 5. The solder printing apparatus according to claim 1, wherein a bent portion that bends in a sliding direction is formed at both ends of the spatula member in a horizontal direction. A solder printing apparatus, comprising: 6. A mask for solder printing is arranged on a substrate placed in the apparatus main body, and a spatula member that slides on the mask is arranged in the apparatus main body. In the solder printing method for printing cream solder on the substrate, the horizontal direction of the spatula member, in a direction perpendicular to the sliding direction, by sliding the spatula member freely,
A solder printing method characterized by printing cream solder.