JP3382436B2 - Electronic component mounting equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component mounting apparatus for mounting electronic components on a circuit board.

[0002]

2. Description of the Related Art Conventionally, in an electronic component mounting apparatus of a type in which a semiconductor chip is mounted on a circuit board with its circuit surface facing downward, the head end surface of the apparatus and the upper surface of a stage holding the circuit board. In order to ensure high parallelism with and to obtain high joint reliability for electronic component mounting, the semiconductor chip with bumps is held by the head and pressed on the stage to check the parallelism state. Then
Adjustment methods such as manually adjusting the parallelism are used.

A method of adjusting the parallelism of the conventional electronic component mounting apparatus will be described with reference to FIGS.

In FIG. 6, which is a perspective view of a conventional electronic component mounting apparatus, reference numeral 1 denotes a suction nozzle for holding a semiconductor chip 2 by a suction hole provided on the lower surface. Reference numeral 3 denotes a nozzle holder, which is composed of a holder upper plate 5 and a holder lower plate 17 which are integrally connected by a connecting column portion 4 having a constricted central portion, and the suction nozzle 1 is fixed to the central portion of the lower surface of the holder lower plate 17. is doing. A ball plunger 6 shown in FIG. 10 is provided at each of four corners between the holder upper plate 5 and the holder lower plate 17, and by adjusting these ball plungers 6, the coupling column portion 4 is moved. By bending, the parallelism between the lower surface of the suction nozzle 1 and the stage 9 is adjusted.
Reference numeral 7 denotes a head upper mechanism, which has a function of rotating the nozzle holder 3 in the direction of arrow a with the vertical direction as an axis and vertically moving in the direction of arrow b. A stage 9 is attached to the base 10 and sucks and holds the circuit board 11. Then, as a whole of the apparatus, the head section 8 horizontally moves in the XY relative to the stage 9.

Next, a method of adjusting the parallelism between the tip surface of the suction nozzle and the upper surface of the stage of the conventional electronic component mounting apparatus will be described with reference to FIGS.

FIG. 7 is a perspective view of a semiconductor chip in which gold bumps 12 are formed side by side around the circuit surface of the semiconductor chip 2. First, in order to confirm the parallelism between the tip surface of the suction nozzle 1 and the upper surface of the stage 9, the suction nozzle 1 suction-holds the semiconductor chip 2, moves to a predetermined position on the circuit board 11, and descends. The semiconductor chip 2 is pressed against a predetermined position on the circuit board 11 with a predetermined pressure to deform the gold bump 12 as shown in FIG. As a result, the height of the gold bump 12 is lowered to H shown in FIG.

Next, the semiconductor chip 2 is removed from the suction nozzle 1 and the gold bumps 13 and 1 at the four corners shown in FIG.
The height of 4, 15, 16 is measured with a microscope. And 4
Due to the difference in the height H of the gold bumps in the corners, the circuit board 1 under pressure
The inclination of the semiconductor chip 2 with respect to 1, that is, the circuit board 11
The inclination of the suction nozzle 1 with respect to

Finally, the ball plungers 6, 6, 6,
6 is operated to correct the inclination of the suction nozzle 1.

FIG. 10 shows the ball plunger 6.
By operating the ball plunger 6, the intervals between the four corners of the holder upper plate 5 and the holder lower plate 17 are adjusted to adjust the inclination of the suction nozzle 1.

The above work is performed every time the size of the circuit board 11 to be produced changes and the stage 9 is replaced in accordance with the change.

[0011]

However, in the configuration of the above-mentioned conventional example, a long working time is required to ensure the parallelism between the head portion and the stage with high accuracy, and the time spent for switching the product type is required. There is a problem that production efficiency is reduced.

When a circuit board having a plurality of mounting points has a minute undulation, it is impossible to readjust the parallelism for each mounting point, and the standard of parallelism is unclear. There is a problem that it is difficult to adjust.

The present invention solves the above problems, makes it easy to adjust and secure the parallelism between the head portion and the stage, can switch the product type in a short time, and further, can mount a plurality of mounting points on the same circuit board. An object is to provide an electronic component mounting device capable of adjusting the parallelism between the head unit and the stage for each.

[0014]

In order to solve the above-mentioned problems, an electronic component mounting apparatus of the present invention holds a head portion for adsorbing and mounting electronic components, and a circuit board on which the electronic components are to be mounted. In an electronic component mounting apparatus including a stage, the head section is provided with a laser length measuring device for measuring the height from the circuit board at a plurality of points, and the stage is based on the plurality of measured heights. An inclination adjusting unit for adjusting the inclination of the stage with respect to the head unit is provided.

According to the present invention, since the laser length measuring device for measuring the height from the circuit board at a plurality of points is provided in the head section, the height of the head section and the stage can be measured by measuring the height at a plurality of points. It is possible to determine the parallelism with the upper surface of the, and in which direction and to what degree it is inclined. Also laser
Since it is a length measuring machine, it is easy to handle and highly accurate.

Since the stage is provided with a tilt adjusting means for adjusting the tilt of the stage based on the plurality of measured heights, it is determined based on which direction and how much the tilt is adjusted. By adjusting the inclination of the stage automatically, the parallelism between the lower surface of the head portion and the upper surface of the stage can be accurately ensured in a short time.

Further, it becomes possible to adjust the parallelism between the head section and the stage for each of a plurality of mounting points on the same circuit board.

[0018]

Further, in the electronic component mounting apparatus of the present invention, in order to solve the above problems, it is convenient to provide three tilt adjusting means in the lower part of the stage.

Further, in order to solve the above-mentioned problems, the electronic component mounting apparatus of the present invention can be easily automated by driving the tilt adjusting means with a ball screw.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. 1 to 5 and 10.

In FIG. 1A, which is a perspective view of the present embodiment, reference numeral 1 denotes a suction nozzle, which is a suction hole provided on the lower surface to suck and hold the semiconductor chip 2. 3 is a nozzle holder,
It consists of a holder upper plate 5 and a holder lower plate 17 which are integrally connected by a connecting column portion 4 (see FIG. 1B) having a constricted central portion, and the suction nozzle is provided at the center of the lower surface of the holder lower plate 17. 1 is fixed. The four corners between the holder upper plate 5 and the holder lower plate 17 are respectively shown in FIG.
The ball plungers 6 shown in FIG. 0 are provided, and by adjusting these ball plungers 6, the coupling column portion 4 is bent to adjust the parallelism between the lower surface of the suction nozzle 1 and the stage 9. Reference numeral 7 denotes a head upper mechanism, which has a function of rotating the nozzle holder 3 in the direction of arrow a with the vertical direction as an axis and vertically moving in the direction of arrow b. A stage 9 is attached to the base 19 and sucks and holds the circuit board 11.

The head unit 8 as a whole is
The XY relative movement is made in the horizontal direction with respect to the stage 9.

The above is similar to the conventional example, but this embodiment has the following features.

That is, the circuit board 11 is provided on the head upper mechanism 7.
The height from fixing the laser length measuring machine 18 measures at a plurality of positions. In this embodiment , since the laser length measuring machine 18 is used to measure the height, it is easy to handle and the accuracy is high.

A base 19 as an inclination adjusting means for mounting the stage 9 is composed of a base upper plate 20 and a base lower mechanism 24.

The base upper plate 20 will be described with reference to FIGS.

As shown in FIG. 2 which is a bottom view of the base upper plate 20, three groove portions 21 whose cross section is shown in FIG. 3 are provided on the lower surface of the base upper plate 20. In each groove 21,
The roller 22 is attached with the shaft 23 as a rotation axis.

The lower base mechanism 24 will be described with reference to FIGS. 4 and 5.

In FIG. 4, which is a perspective view of the lower base mechanism 24, the height adjusting means A has the groove portions 21, 21, 21.
Three are attached to the position corresponding to. A support block 25 receives the roller 22 at a point B on its upper surface. A ball screw nut 26 is fitted in the support block 25. The ball screw shaft 27 has a bracket 28,
Both ends are rotatably supported by bearings 30 and 31 fitted in 29.

A knob 32 that is rotated by hand is provided at one end of the ball screw shaft 27, and the other end is connected to a shaft 34 of a motor 33 via a coupling 35. A guide block 36 fixed to the bottom surface of the block 25 is guided by a rail 37 and linearly moved by the ball screw nut 26 and the ball screw shaft 27. Since the rail 37 is mounted on the inclined base block 38 with a slope, the guide block 36
Is the ball screw nut 26 and the ball screw shaft 27.
As a result of the linear movement, the height changes, and the point B on the upper surface of the support block 25 moves up and down. The upper surface of the support block 25 is parallel to the upper surface of the base plate 39. Although not shown, in order to fix the mutual upper and lower positions of the upper base plate 20 and the lower base mechanism 24 in the horizontal direction, guides are provided on the four vertical and horizontal sides to regulate the mutual displacement.

The operation of this embodiment will be described below with reference to FIGS.

First, the ball plungers 6, 6, 6, 6
Is adjusted to make the suction surface of the suction nozzle 1 horizontal. Then, as shown in FIG. 5, four measurement points C, D, E, and F are set on the circuit board 11, and the circuit board 11 is set as shown in FIG.
It is held on the stage 9 as shown in FIG. In this state, the laser length measuring machine 18 is used to measure the height from the measurement points C, D, E, F to the head portion 8. The inclination of the stage 9 with respect to the movement of the head portion 8 in the XY directions is obtained from the measured height. The obtained inclination is corrected by driving the motor 33, and the upper surface of the circuit board 11 is made parallel to the movement of the head unit 8 in the XY directions.

Next, the operation of the lower base mechanism 24 will be described with reference to FIG.

When the motor 33 is rotated, the ball screw shaft 27 is rotated, and the support block 25 is moved in the G direction or the H direction depending on the rotation direction. When moving in the G direction, point B on the upper surface of the support block 25 rises, and when moving in the H direction, point B on the upper surface of the support block 25 falls. When this operation is independently performed on the three motors 33, 33, 33, the heights of the points B on the upper surfaces of the three support blocks 25 can be independently adjusted, and the three motors 33, 33, 33 can be adjusted independently. It is possible to automatically adjust the inclination of the stage 9 by adjusting the height of the rollers 22, 22, 22.

If the above operation is automated by an existing automation technique, the parallelism between the head and the stage can be secured with high accuracy in a short time. Further, the parallelism between the suction nozzle and the stage can be adjusted for each of a plurality of mounting points on the same circuit board.

The configuration of the height adjusting means A is not limited to the configuration of this embodiment, and can be freely designed according to the purpose of adjusting the heights of three points.

[0038]

According to the electronic component mounting apparatus of the present invention, the parallelism between the head portion and the stage can be easily adjusted and ensured, the product types can be switched accurately in a short time, and moreover, a plurality of devices can be mounted on the same circuit board. It is possible to obtain the effect that the parallelism between the head unit and the stage can be adjusted for each mounting point.

[Brief description of drawings]

FIG. 1A is a perspective view showing a main part of an embodiment of the present invention, and FIG. 1B is a front view showing a coupling column part.

FIG. 2 is a bottom view showing a part of the embodiment of the present invention.

FIG. 3 is a sectional view showing a part of an embodiment of the present invention.

FIG. 4 is a perspective view showing a main part of an embodiment of the present invention.

FIG. 5 is a plan view of a circuit board.

FIG. 6 is a perspective view showing a main part of a conventional example.

FIG. 7 is a perspective view of a semiconductor chip.

FIG. 8 is an enlarged view of a bump.

FIG. 9 is a plan view of a semiconductor chip.

FIG. 10 is a partial cross-sectional view of the holder.

[Explanation of symbols]

A height adjustment means 1 Suction nozzle 2 semiconductor chips 3 nozzle holder 4 constriction 5 Holder upper plate 6 ball plunger 7 Head upper mechanism 8 head 9 stages 11 circuit board 17 Lower plate of holder 18 Laser length measuring machine 19 base 20 Base upper plate 21 groove 22 Laura 23 Shaft 24 Base lower mechanism 25 Support block 26 Ball screw nut 27 Ball screw shaft 28 bracket 29 bracket 30 bearings 31 bearing 32 knob 33 motor 34 shaft 35 coupling 36 Guide block 37 rails 38 Inclined base block

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-5-315399 (JP, A) JP-A-4-94553 (JP, A) JP-A-3-179757 (JP, A) JP-A-63- 175437 (JP, A) JP-A-4-85839 (JP, A) JP-A-4-239738 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01L 21/60 H01L 21 / 52 H05K 3/33 H05K 13/04 B23Q 3/00

Claims (3)

(57) [Claims] 1. A head unit for adsorbing and mounting electronic components,
In an electronic component mounting apparatus including a stage for holding a circuit board on which the electronic component is to be mounted, a laser measurement for measuring the height from the circuit board in the head portion at a plurality of points.
An electronic component mounting apparatus, wherein a long machine is provided, and tilt adjustment means for adjusting tilt of the stage with respect to the head portion is provided on the stage based on the measured heights. 2. The electronic component mounting apparatus according to claim 1, wherein three tilt adjusting means are provided in a lower portion of the stage. 3. The electronic component mounting apparatus according to claim 1, wherein the tilt adjusting means is driven by a ball screw.