JPH11163599A - Apparatus and method of mounting electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly stop a transfer head at specified coordinate position on a board to mount electronic components there at a high positional accuracy, with moving the transfer head horizontally in directions X, Y for mounting the components on the board. SOLUTION: An apparatus comprises a Y-table mechanism 10 having a feed screw 11 at one side of a base 1 and Y-table mechanism composed of a linear motor at the other side. A motor 13 rotates the feed screw 11 to move a transfer head 6 in a direction Y. A linear motor 20 follows up this moving to move along a guide rail 21, resulting in a lack of travel distance which is detected by a sensor to drive the linear motor 20 so as to compensate this lack. Thus the head 6 exactly stops at a specified position to mount electronic components on a board 3 at a high positional accuracy.

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 and an electronic component mounting method for mounting an electronic component of a parts feeder on a substrate while horizontally moving a transfer head in an X direction or a Y direction.

[0002]

2. Description of the Related Art There are various types of electronic component mounting apparatuses for mounting an electronic component on a substrate. The transfer head is horizontally moved in the X and Y directions by an X table mechanism and a Y table mechanism. The type in which the electronic components of the parts feeder are mounted on a substrate has advantages of relatively simple structure and high versatility, and thus is widely used at present. Hereinafter, this type of conventional electronic component mounting apparatus will be described with reference to the drawings.

FIG. 5 is a plan view of a conventional electronic component mounting apparatus. Reference numeral 1 denotes a base, and a guide rail 2 is provided at the center of the upper surface. The substrate 3 is transported along the guide rail 2 and stopped at a predetermined position to be positioned. A large number of parts feeders 4 are juxtaposed at the front and back of the upper surface of the base 1. Each parts feeder 4 is provided with an electronic component. Between the guide rail 2 and the parts feeder 4, a recognizing unit 5 for recognizing a displacement of the electronic component.
Is provided. Reference numeral 6 denotes a transfer head. Next, a moving mechanism for horizontally moving the transfer head 6 in the X direction or the Y direction will be described. Note that the direction in which the substrate 3 is transported by the guide rail 2 is defined as the X direction, and the direction orthogonal thereto is defined as the Y direction.

A long feed screw 11 and a guide rail 12 are provided on both sides of the upper surface of the base 1 in the Y direction. 13
Is a motor for rotating the feed screw 11. These elements constitute the Y table mechanism 10.

An X table mechanism 15 is provided on the left and right Y table mechanisms 10. The X table mechanism 15
A feed screw 16 and a motor 17 for rotating the feed screw 16 are built in a frame 14 elongated in the X direction. Although not shown, on both sides of the frame 14,
A nut that is screwed to the feed screw 11 in the Y direction is provided. Therefore, when the motor 13 is driven to rotate the feed screw 11, the nut moves in the Y direction along the feed screw 11, whereby the frame 14 having the X table mechanism 15 moves in the Y direction.

[0006] A nut 18 is screwed to the feed screw 16 in the X direction, and the transfer head 6 is connected to the nut 18. When the motor 17 is driven to rotate the feed screw 16, the nut 18 moves in the X direction along the feed screw 16, whereby the transfer head 6 moves in the X direction. Therefore, when the motor 13 and the motor 17 are driven, the transfer head 6 moves horizontally in the X direction and the Y direction.

[0007] X table mechanism 15 and Y table mechanism 10
Is driven, the transfer head 6 moves above a predetermined parts feeder 4, and vacuum picks up and picks up an electronic component by a nozzle (not shown). Next, the transfer head 6 moves above the recognizing unit 5, and the recognizing unit 5 recognizes a displacement of the electronic component vacuum-adsorbed to the lower end of the nozzle. Next, the transfer head 6 moves above the substrate 3 and mounts the electronic component at a predetermined coordinate position on the substrate 3.

[0008]

As described above, the transfer head 6 is horizontally moved in the X and Y directions by the operation of the Y table mechanism 10 and the X table mechanism 15. In this case, in order to balance the left and right of the X table mechanism 10, two Y table mechanisms 10 are provided on the left and right sides.
Move in the direction.

However, the amount of movement in the Y direction by the feed screw 11 or the motor 13 of the Y table mechanism 10 on the right side and the amount of movement in the Y direction by the feed screw 11 or the motor 13 of the Y table mechanism 10 on the left side Variations occur due to the molding error of the motor and the rotation error of the motor 13. For this reason, the frame 14 does not move in the Y direction in a posture completely parallel to the X direction, and the transfer head 6 is stopped above the substrate 3 in order to mount the electronic component on the substrate 3, and is indicated by a chain line. As shown in the figure, the posture of the frame 14 collapses, and the frame 14 is easily inclined in the horizontal rotation direction (inclination angle θ1).

[0010] When the attitude of the frame 14 is distorted in this way, the stop position of the transfer head 6 is disturbed, and there is a problem that the mounting position accuracy of the electronic components is reduced. In addition, there is a problem that a large stress is generated in the left and right feed screws 11 due to the above-mentioned variation in the movement amount, and the life of the feed screws 11 is shortened.

Therefore, the present invention solves the above-mentioned conventional problems, and provides an electronic component mounting apparatus and an electronic component mounting method capable of correctly stopping a transfer head at a predetermined position and mounting electronic components on a substrate with high positional accuracy. The purpose is to:

[0012]

According to an electronic component mounting apparatus of the present invention, an X-table mechanism and a Y-table mechanism are driven to horizontally move a transfer head in the X direction and the Y direction, and the parts are moved by the transfer head. An electronic component mounting apparatus configured to pick up an electronic component provided in a feeder and transfer and mount the electronic component on a substrate positioned by a positioning unit, wherein the Y table mechanism is provided on one side of the base. A feed screw means comprising a feed screw and a motor, and a linear motor provided on the other side of the base and a detection means for detecting a moving amount of the linear motor,
The detection means detects an insufficiency in the amount of movement of the linear motor in the Y direction following the drive of the feed screw means,
The shortage is complemented by driving the linear motor.

The electronic component mounting method according to the present invention further comprises a step of driving the X table mechanism and the Y table mechanism to move the transfer head above the parts feeder, and picking up the electronic parts provided in the parts feeder. The X-table mechanism and one of the two Y-table mechanisms provided on both sides of the X-table mechanism are driven, and one of the Y-table mechanisms is driven to move the transfer head above predetermined coordinates on the substrate. A step of detecting an insufficient amount of movement of the linear motor of the other Y table mechanism following the one Y table mechanism by a detecting unit, and a step of driving the linear motor to compensate for the insufficient amount. Mounting the electronic component held by the transfer head on the substrate.

According to the present invention having the above-described structure, the linear motor is moved in the Y direction by following the drive of one Y-table mechanism comprising a feed screw, and the other Y-table mechanism is moved in the Y direction. Since the linear motor is driven and complemented, the stop position accuracy of the transfer head in the Y direction is extremely high, and the electronic component can be mounted on the substrate with high position accuracy.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view of an electronic component mounting apparatus according to an embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a block diagram of the control system, and FIG. 4 is a schematic diagram of an X table mechanism and a Y table mechanism. It is a top view.

First, the overall structure of the electronic component mounting apparatus will be described with reference to FIG. Note that the same elements as those of the conventional example shown in FIG. Reference numeral 1 denotes a base, and a guide rail 2 is provided at the center of the upper surface. The substrate 3 is transported along the guide rail 2 and stopped at a predetermined position to be positioned. A large number of parts feeders 4 are juxtaposed at the front and back of the upper surface of the base 1. Each parts feeder 4 is provided with an electronic component. A recognition unit 5 is provided between the guide rail 2 and the parts feeder 4 to recognize the displacement of the electronic component. Reference numeral 6 denotes a transfer head. Next, a moving mechanism for horizontally moving the transfer head 6 in the X direction or the Y direction will be described.

On both sides of the upper surface of the base 1, a feed screw 11 and a guide rail 12 which are long in the Y direction are provided. 13
Is a motor for rotating the feed screw 11. These elements constitute the Y table mechanism 10. On the other side of the base 1, a linear motor 20 is provided. The linear motor 20 is connected to the left end of the frame 14 and moves along a guide rail 21 in the Y direction. FIG.
, 22 is a magnet built in the linear motor 20. The linear motor 20 is provided with a scale reading sensor 23 as detecting means for detecting the amount of movement. The sensor 23 reads a scale formed on the guide rail 21.

Next, a control system will be described with reference to FIG.
Reference numeral 30 denotes a control unit including a CPU. The data read by the sensor 23 is input to the control unit 30. Control unit 30
Controls the motors 13 and 17 through the drivers 31 and 32 and controls the linear motor 20. The control unit 30
Performs other necessary controls and calculations.

This electronic component mounting apparatus has the above-described configuration, and its operation will be described next. In FIG. 1, when the motor 13 and the motor 17 are driven, the transfer head 6 moves in the X direction and the Y direction, and mounts the electronic components provided in the parts feeder 4 on the substrate 3.

The frame 14 is moved in the Y direction by the rotation of the feed screw 11 driven by the motor 13 provided on one side of the base 1, but is provided on the other side of the base 1. The driven linear motor 20 does not drive this Y
The sensor 23 moves in the Y direction following the movement in the direction, and the sensor 23 reads the movement amount of the linear motor 20. The motor 13 of the Y table mechanism 10 is driven to move the transfer head 6 by a predetermined distance according to a command from the control unit 30.

In FIG. 4, a frame 14 indicated by a solid line
5 shows a state in which the transfer head 6 is stopped on the substrate 3 by driving the Y table mechanism 10. Linear motor 2
Since 0 moves following the Y table mechanism 10, the movement amount is insufficient, and the frame 14 is slightly inclined with respect to the X direction (inclination angle θ2). In the figure, L is an insufficient amount of movement.

The shortage L is transmitted from the control unit 30 to the motor 13.
Is calculated by the control unit 30 based on the difference from the movement amount in the Y direction instructed by the sensor 23 that detects the movement amount of the linear motor 20. Therefore, the control unit 30
Outputs a drive command to the linear motor 20 so as to supplement the shortage L. Then, the linear motor 20 moves in the Y direction by the shortage L. This makes frame 1
4 is in a posture completely parallel to the X direction as shown by a chain line in FIG. Therefore, the transfer head 6 transfers the electronic component to the substrate 3
To be mounted on. As described above, according to this electronic component mounting apparatus, the transfer head 6 can be stopped correctly at a predetermined position, and the electronic component can be mounted on the substrate 3 with high positional accuracy.

[0023]

According to the present invention, the linear motor is moved in the Y direction by following the drive of one Y table mechanism comprising a feed screw, and the other Y table mechanism is linearly moved. Since the motor is complemented by driving, the stop position accuracy of the transfer head is extremely high, and the electronic component can be mounted on the substrate with high position accuracy.

[Brief description of the drawings]

FIG. 1 is a plan view of an electronic component mounting apparatus according to an embodiment of the present invention.

FIG. 2 is a front view of the electronic component mounting apparatus according to the embodiment of the present invention;

FIG. 3 is a block diagram of a control system of the electronic component mounting apparatus according to the embodiment of the present invention;

FIG. 4 is a view showing an X of the electronic component mounting apparatus according to the embodiment of the present invention
Schematic plan view of table mechanism and Y table mechanism

FIG. 5 is a plan view of a conventional electronic component mounting apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Guide rail 3 Substrate 4 Parts feeder 6 Transfer head 10 Y table mechanism 11 Feed screw 13 Motor 15 X table mechanism 20 Linear motor 23 Sensor 30 Control part

 ──────────────────────────────────────────────────の Continuing on the front page (72) Koji Takada, Inventor 1006, Kazuma, Kadoma, Osaka, Japan Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] An electronic table provided on a parts feeder by a transfer head while driving a transfer head horizontally in an X direction or a Y direction by driving an X table mechanism and a Y table mechanism provided on a base. An electronic component mounting apparatus that picks up a component and transfers and mounts the component on a substrate positioned at a positioning unit, wherein the Y table mechanism is configured to include a feed screw and a motor provided on one side of the base. Feed screw means, and a linear motor provided on the other side of the base and a detecting means for detecting the amount of movement of the linear motor, the Y of the linear motor following the drive of the feed screw means. A shortage of the moving amount in the direction is detected by the detection means, and the shortage is complemented by driving the linear motor. Apparatus. 2. A step of driving an X table mechanism and a Y table mechanism to move a transfer head above a parts feeder to pick up an electronic component provided in the parts feeder, an X table mechanism, and an X table mechanism. Driving one of the left and right Y table mechanisms provided on both sides of the Y table mechanism comprising a feed screw to move the transfer head above predetermined coordinates on the substrate;
A step of detecting the shortage of the moving amount of the linear motor of the other Y table mechanism following the table mechanism by the detecting means, a step of driving the linear motor to compensate for the shortage, and a step of holding the transfer head Mounting an electronic component on a substrate.