JPH10163255A - Paste supplying equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable adjustment of liquid thickness with excellent precision, by installing a pedestal in which trenches for storing paste are arranged, on the side part of a plane surface for supplying paste whose liquid thickness is adjusted to be constant. SOLUTION: A first squeegee 32 is lowered by a cylinder 36, a roller 41 is brought into contact with a plane surface 16, and a motor 26 is driven. When the squeegee 32 is moved parallel, the roller 41 is rotated on the plane surface 16, and flux in a trench 18 is drawn-up, moves in the arrow N6 direction and reaches large diameter parts 41a, 41b. After that, the flux moves to the center side of the plane surface 16 and moves parallel together with the squeegee 32. Accompanying the translational movement, the large diameter parts 41a, 41b are rotated and brought into contact with both edge parts of the plane surface 16. Only the flux passing a gap having a height H which is formed between the lower end part of a small diameter part 41c and the plane surface 16 is left behind the squeegee 32. Since the flux which can not pass the gap returns to the trench 18, a flux pool is not formed on the plane surface 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paste supply device.

[0002]

2. Description of the Related Art In a manufacturing process of an electronic component or a circuit module, a paste supply device that adjusts and supplies a paste such as a flux to a certain liquid thickness is used. As the paste supply device, there is a type in which a squeegee is moved in parallel to form a paste having a constant liquid thickness on a flat surface.

[0003]

Next, the problems in this type of paste supply apparatus will be described with reference to FIG. In FIG. 5, reference numeral 1 denotes a container, and reference numeral 2 denotes a flat surface formed at the center of the container 1. A flux 3 as a paste is stored in the container 1, and the squeegee 4 is slid on the flat surface 2 in a direction perpendicular to the paper surface to keep the liquid thickness of the flux 3 on the flat surface 2 constant. Is what you do.

That is, at the time of this sliding, the lower end edge 4a of the squeegee 4 passes through a position that is horizontal and at a certain height H from the flat surface 2. However, the width of the squeegee 4 must be smaller than the width of the flat surface 2 in order to smoothly slide in the container 1. For this reason, when the squeegee 4 is slid, the flux 3 pushed to both sides by the squeegee 4 on both sides of the squeegee 4 is present in a state of rising as flux reservoirs 3a and 3b (FIG. 5 ( a)).

[0005] When a certain time has elapsed after the movement of the squeegee 4, the portions that have been raised as the flux reservoirs 3a and 3b flow inward as indicated by the arrow N1 in FIG. As shown in FIG. 5A, even if the liquid thickness H is adjusted to a constant value, the state immediately after the adjustment is found.
The result is that the liquid thickness on the flat surface 3 varies.

Accordingly, an object of the present invention is to provide a paste supply device capable of adjusting the liquid thickness with high accuracy.

[0007]

According to the present invention, there is provided a paste supply apparatus comprising: a flat surface for supplying a paste adjusted to a constant liquid thickness; and a groove provided on a side of the flat surface for storing the paste. And a roller that rotates on the flat surface and adjusts the paste that has been scraped on the flat surface to a constant liquid thickness. A squeegee provided with the squeegee and moving means for moving the squeegee relative to the base.

[0008]

A paste supply device according to a first aspect of the present invention comprises a flat surface for supplying a paste adjusted to a constant liquid thickness, and a groove provided on a side of the flat surface for storing the paste. , A projection that lifts the paste from the groove to a flat surface, and a roller that rotates on the flat surface and adjusts the paste that has been lifted onto the flat surface to have a constant liquid thickness And a moving means for moving the squeegee relative to the base.

Therefore, when the squeegee is moved, the paste is scraped up from the groove to the flat surface, the roller rotates on the flat surface, and the liquid thickness of the paste on the flat surface is adjusted to be constant. At this time, the paste overflowing from the flat surface returns to the groove again, so that a paste reservoir that rises to the side of the flat surface is not formed.

Therefore, the state immediately after the squeegee is moved is maintained as it is, and the liquid thickness on the flat surface can be controlled accurately. In addition, the roller is in rotational contact with the flat surface, and only one portion of the roller does not repeatedly contact the flat surface. Therefore, the wear resistance of the squeegee is high, and the life of the squeegee can be extended.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a component transfer device using a paste supply device according to an embodiment of the present invention. In FIG. 1, 5 is a horizontal base, 6 and 7 are conveyors for transporting and positioning the substrate 8 in the X direction, and 9 is provided with a head 10 that moves on the base 5 and sucks a flip chip 11 below. Reference numeral 12 denotes a tray for storing the flip chips 11 in a matrix, and 13 denotes a paste supply device.

In this component transfer apparatus, the moving table 9 moves in the direction of arrow N2 to pick up the flip chip 11 from the tray 12, and moves in the direction of arrow N3 to apply the flip to the flux supplied by the paste supply device 13. Attach the bump formed on the lower part of the chip 11,
The flip chip 11 is mounted at a predetermined position on the substrate 8 by moving in the direction of arrow N4.

Next, the paste supply device 13 will be described with reference to FIGS. In FIG. 2, reference numeral 14 denotes a base horizontally supported on the base 5 by four columns 15. A horizontal flat surface 16 is formed at the center of the base 14 along the longitudinal direction of the base 14, and parallel grooves 17, 18 are provided on both sides of the flat surface 16. It is formed low. The flux 3 is stored in the grooves 17, 18, and a flux having a constant liquid thickness H exists on the flat surface 16 by a squeegee described later.

As shown in FIG. 3, on the lower surface of the base 14,
Two rails 19 and 20 are fixed in parallel with the longitudinal direction of the base 14. Reference numeral 21 denotes a moving frame having a substantially U-shaped cross section.
Sliders 22 and 23 are slidably engaged with the slider 20. Therefore, the frame 21 is
3 is slidably supported in the direction perpendicular to the plane of FIG.

A feed nut 24 is provided at a lower portion of the moving frame 21.
Is screwed. As shown in FIG. 2, the rotational force of the motor 26 is transmitted to the feed screw 25 via the pulley 27, the timing belt 28, and the pulley 29. When the motor 26 is driven, the moving frame 21 is grooved. It can be moved parallel to the strips 17,18.

Further, as shown in FIG.
Lift guides 30 and 31 are provided on both sides of the squeegee. The first squeegee 32 is supported by the lift guides 30 and 31 so as to be able to move up and down in the vertical direction. That is, the first squeegee 32
Has a horizontal portion 33 and vertical portions 34 and 35 bent vertically downward from both ends of the horizontal portion 33.
The lower part of 5 is slidably engaged with the elevating guides 30 and 31.

The horizontal portion 33 of the first squeegee 32 has two protrusions 3 which engage with the grooves 17 and 18, respectively.
9, 40 are formed. Further, the horizontal portion 33 is brought into rotational contact with both edges of the flat surface 16, and the flux 3 lifted up from the grooves 17, 18 onto the flat surface 16 by the protrusions 39, 40 to a constant liquid thickness H. Both ends of the roller 41 that is adjusted so as to be rotatably supported are rotatably supported.

Among the rollers 41, 41a and 41b are ring-shaped large-diameter portions that come into rotational contact with both edges of the flat surface 16, and 41c has a liquid thickness H larger in radius than the large-diameter portions 41a and 41b.
It is a columnar small diameter portion formed only small. Therefore, when the roller 41 rotates, a thin film of the flux 3 having the liquid thickness H is formed on the central portion of the flat surface 16 through which the small diameter portion 41c passes regardless of the rotation position. here,
Since the lower portions of the large-diameter portions 41a and 41b come into contact with the flat surface 16 while rotating, only a part of the roller 41 does not repeatedly come into contact with the flat surface 16 to be worn, thereby extending the life of the roller 41. can do.

The lower part of the vertical portion 34 of the first squeegee 32 is provided with a cylinder 3 fixed to the side of the moving frame 21.
When the cylinder 36 is driven, the first squeegee 32 can be raised and lowered.

As shown in FIG. 2, the first squeegee 32
Similarly to the above, a second squeegee 44 is supported on the movable frame 21 so as to be able to move up and down, and 45 is a cylinder that moves up and down the second squeegee 44. The first squeegee 32 and the second squeegee 44 have the same shape, but are set so as to face each other, and are opposite to each other in the longitudinal direction of the pedestal portion 14.

Therefore, when the cylinders 36 and 45 are driven, the first squeegee 32 and the second squeegee 44 can be raised and lowered independently. When the motor 26 is driven, the first squeegee 32 and the second The squeegee 44 can be translated in the longitudinal direction of the base 14. Here, the motor 26, the pulleys 27 and 29, the timing belt 28, the feed screw 25 and the feed nut 24
It corresponds to a moving means of the first squeegee 32 and the second squeegee 44.

Next, the operation at the time of squeezing will be described with reference to FIG. The operation of the first squeegee 32 and the operation of the second squeegee 44 are the same.
Since the reference numerals 2 and 44 are symmetrical with respect to the center line of the flat surface 16, only one side of the first squeegee 32 will be described.

As described above, the horizontal portion 33 of the first squeegee 32 is provided with the roller 41 and the protrusion 39, and the protrusion 39 is engaged with the groove 18 as shown in FIG. The roller 41 is on the flat surface 16.

More specifically, the protrusion 39 has a raised surface A inclined toward the small diameter portion 41c of the roller 41. Further, as described above, the roller 41 has large-diameter portions 41 a at both ends that are in rotational contact with the flat surface 16,
41b, between which a small diameter portion 4 whose radius is short by the liquid thickness H
1c. Then, on the upper portion of the protrusion 39, the flux 3 scraped up by the scraping surface A is applied to the large diameter portion 41a.
A guide surface C for guiding to the small-diameter portion 41c via is formed.

Therefore, when the first squeegee 32 is lowered using the cylinder 36, the roller 41 is brought into contact with the flat surface 16, and the motor 26 is driven to move the first squeegee 32 in parallel. 16, the flux 3 stored in the groove 18 first contacts the scraping surface A and the guide surface C, as shown by the arrow N6.
Large diameter portions 41a, 41b
, And further comes into contact with the small-diameter portion 41c, moves to the center side of the flat surface 16, and is pushed by the peripheral surface of the small-diameter portion 41c to move in parallel with the first squeegee 32.

Then, with this parallel movement, the large diameter portion 41
a, 41b make rotational contact on both edges of the flat surface 16. Further, there is a gap of a height H between the lower end of the small diameter portion 41c and the flat surface 16, and the flux 3 passing through this gap has a height H.
Only the first squeegee 32 is allowed to remain behind. On the other hand, the flux 3 that has not been able to pass through the gap has to return to the inside of the groove 18 or move to the end of the flat surface 16 together with the peripheral surfaces of the large diameter portions 41a and 41b or the small diameter portion 41c.

Therefore, after squeezing,
No flux reservoir is formed on the flat surface 16, and the liquid thickness of the flux 3 on the flat surface 16 can be accurately maintained at a constant value H.

[0028]

According to the paste supply apparatus of the present invention, the flux reservoir is not formed on the flat surface after squeezing, the liquid thickness on the flat surface can be controlled with high accuracy, and the ski can be repeatedly used. Less squeegee wear even when ging.

[Brief description of the drawings]

FIG. 1 is a plan view of a component transfer device using a paste supply device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a paste supply device according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a paste supply device according to an embodiment of the present invention.

FIG. 4 is a partially enlarged view of a paste supply device according to an embodiment of the present invention.

FIG. 5A is a diagram illustrating the operation of a conventional paste supply device. FIG. 5B is a diagram illustrating the operation of a conventional paste supply device.

[Explanation of symbols]

 14 Base 16 Flat surface 17, 18 Groove 32 First squeegee 39, 40 Projection 41 Roller H Liquid thickness

Claims (2)

[Claims] 1. A flat surface for supplying a paste adjusted to a constant liquid thickness, a base provided on a side portion of the flat surface and provided with grooves for storing the paste, A squeegee provided with a projection that scrapes up from the strip to the flat surface, a roller that rotates on the flat surface, and adjusts the paste scraped up on the flat surface to have a constant liquid thickness, Moving means for moving a squeegee relative to the base. 2. The paste supply device according to claim 1, wherein said grooves are provided on both sides of said flat surface, and said projections are provided corresponding to each of said grooves. .