JPH1027954A - Paste dispenser and paste dispensing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a liquid-thickness control precision by forming grooves to store paste, at side portions of a flat portion, scraping the paste from the grooves up onto the flat portion by a projection, and moving a squeegee so as to control the liquid-thickness of the paste to a fixed liquid-thickness. SOLUTION: A platen 14 has a flat surface 16 at its central portion, and the flat surface 16 has grooves 17 and 18 at its both sides. Flux 3 as paste is stored in the grooves 17 and 18. A first squeegee 32 has projections 39 and 40, to be engaged with the grooves 17 and 18 and to scrape the flux 3 up onto the flat surface 16, and a flux collecting portion 41 to collect the flux 3. The first squeegee 32 is moved downward by a cylinder 36, to bring the flux collecting portion 41 into contact with the flat surface 16. When the first squeegee 32 is moved in parallel by a motor 26, the flux 3 is scraped by the projections 39 and 40 from the grooves 17 and 18 up onto the flat surface 16, and moved with the first squeegee 32 in parallel, thus, the flux 3 has a fixed liquid thickness. A second squeegee 44 operates in the same manner as that of the first squeegee 32.

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 and a paste supply method.

[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 is stored in the container 1, and a squeegee 4 is placed on the flat surface 2.
Is made to slide in the direction perpendicular to the paper surface, thereby trying to keep the liquid thickness of the flux 3 on the flat surface 2 constant.

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. Therefore, 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 an 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 molding part for scraping the paste from the groove to the flat surface, and the paste that is connected to the projection and scraped on the flat surface so as to have 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. And a molding part for scraping the paste from the groove to the flat surface, and the paste that is connected to the projection and scraped on the flat surface so as to have a constant liquid thickness. A squeegee provided with the squeegee and 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, and the liquid thickness of the paste on the flat surface is made constant by the molding portion. At this time,
Paste overflowing from the flat surface returns to the groove again,
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.

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. At the center of the base 14, a horizontal flat surface 16 is formed along the longitudinal direction of the base 14, and on both sides of the flat surface 16, parallel grooves 17 and 18 are provided. 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. 1, the rotational force of a motor 26 is transmitted to the feed screw 25 via a pulley 27, a timing belt 28, and a pulley 29. 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, and 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 and 40, and a forming portion 41 for scraping the flux 3 scraped up from the grooves 17 and 18 onto the flat surface 16 by the projections 39 and 40 so as to have a constant liquid thickness H are formed.

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. 1, 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.

Accordingly, 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 3, 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 forming portion 41 and the protrusion 40, and the protrusion 40 is engaged with the groove 18 as shown in FIG. In this case, the molding 41 is on the flat surface 16.

More specifically, the protruding portion 40 has a raised surface A inclined toward the forming portion 41.
Further, an extruded surface B that is inclined backward with respect to the traveling direction of the first squeegee 32 is formed in the forming portion 41. A guide surface C that connects the scraping surface A and the pushing surface B is formed at an upper portion of the protrusion 40.

Accordingly, when the first squeegee 32 is lowered by using the cylinder 36 to bring the forming portion 41 into contact with the flat surface 16 and the motor 26 is driven to move the first squeegee 32 in parallel, as indicated by an arrow N6. As described above, the flux 3 accumulated in the groove 18 first comes into contact with the scraping surface A and the guide surface C, is scraped from the groove 18 and moves to the center side of the flat surface 16, The squeegee 32 is pushed by the pushing surface B and moves parallel to the first squeegee 32.

Further, the lower portion of the extrusion surface B has a contact portion 42 on both sides thereof in contact with the flat surface 16 and a fixed height H located inside the contact portion 42 and higher than the contact portion 42. And a molding edge 43 engraved upward. That is, when the contact portion 42 slides on the flat surface 16, the forming edge 4
3 and the flat surface 16, there is a gap of the height H, and only the flux 3 passing through this gap is the first squeegee 3.
Allowed to remain behind 2. On the other hand, the flux 3 that could not pass through the gap has to return to the groove 18 or move to the end of the flat surface 16 together with the extrusion surface B, and has reached the end of the flat surface 16 together with the extrusion surface B. Flux 3
Is not allowed to return to the center side of the flat surface 16 because the running is blocked by the flat surface 16.

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.

[0027]

According to the present invention, there is provided a paste supply apparatus having a flat surface for supplying a paste adjusted to a constant liquid thickness, and a base provided on a side of the flat surface and having a groove for storing the paste. And a squeegee having a shaping part for scraping the paste from the groove to the flat surface, and a forming part connected to the protrusion and scraping the paste scraped on the flat surface so as to have a constant liquid thickness. Since there is a moving means for moving the squeegee relatively to the base, no flux reservoir is formed on the flat surface after squeezing, and the liquid thickness on the flat surface can be controlled with high precision.

[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 part 16 flat surface 17, 18 groove 32 first squeegee 39, 40 protrusion 41 molded part H liquid thickness

Claims (3)

[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 protruding portion which is lifted from the strip to the flat surface, a forming portion which is connected to the protruding portion, and which scrapes the paste which has been lifted on the flat surface so as to have a constant liquid thickness; And a moving means for moving the paste 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. . 3. A paste is stored on both sides of a flat surface for supplying the paste, and when the squeegee is slid, the stored paste is symmetrically scraped from both sides of the flat surface, and the scraped paste is fixed. A paste supply method characterized by adjusting the liquid thickness of the paste.