JP2003251648A - Film supply apparatus and film supply method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a film supply apparatus for supplying a film by an accurate feed-out quantity when the film is used for sealing an electronic part with a resin, and a film supply method using the same. <P>SOLUTION: The film supply apparatus is equipped with a feed-out roll 2 for feeding out the film 1 to take up the same, a film taking-up roll 7, a feed-out shaft 8 having the feed-out roll 2 attached thereto, the feed-out motor 9 of which the rotary shaft is fixed to the feed-out shaft 8, a taking-up shaft 10 having the film taking-up roll 7 attached thereto, a taking-up motor 11 of which the rotary shaft is fixed to the taking-up shaft 10, a length measuring roller 3 and tension rollers 4, 5 and 6 functioning so as to apply constant tension to the film 1, an encoder 13 forming pulses corresponding to the quantity of rotation of the length measuring roller 3 of which the rotary shaft is fixed to a length measuring roller shaft 12 and a control part 15 for counting the pulses received from the encoder 13 to stop the feed-out motor 9 and the taking-up motor 11 when the count value reaches a set value. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film supply device and a film supply device for supplying a film when a die and a film which face each other are used in resin-sealing an electronic component mounted on a substrate. It is about the method.

[0002]

2. Description of the Related Art A conventional film supply device will be described with reference to FIG. FIG. 2 is a partial cross-sectional view showing the structure of a conventional film supply device. A lower mold 20 and an upper mold 21 are provided to face each other, and the lower mold 2
A substrate 23 on which electronic components (not shown) are mounted is placed in the recess 22 of 0. Here, the molten resin is injected into the cavity 24 via a resin flow path (not shown) provided in the upper mold 21, and the molten resin is cured. As a result, the cured resin 25 is formed on the substrate 23, and a molded product including a package which is a final product is manufactured. Lower mold 20
A film 26 is stretched between the upper mold 21 and the upper mold 21. The film 26 is supplied from the delivery-side roll 27, is wound by the winding-side roll 30 via the tension rollers 28 and 29. Delivery side roll 27
The take-up roll 30 is driven by a motor (not shown). Then, by turning on or off a signal, a voltage, or the like supplied to each motor, the film 26 is sent out between the molds by a constant distance (feeding amount). Here, the film 26 is made of, for example, a fluororesin, and is used for ensuring the releasability between the cavity 24 and the cured resin 25. Also, the film 26
Is a transfer film, and may be used to transfer a pattern (logotype, product name, etc.) previously formed on the lower surface of the film 26 in the figure to the cured resin 25.

[0003]

However, according to the conventional film supply device, the film 26 is sent out by turning on or off the signal or the like supplied to each motor, so that the amount of the film 26 sent out can be accurately measured. There is a problem that it is difficult to set. Therefore, the film 26 may be scraped. This is a particularly serious problem when the film 26 is made of expensive fluororesin for ensuring releasability. In addition, when the film 26 is a transfer film, the transfer position of the pattern in the molded product may fluctuate, which may cause a defective appearance. In order to deal with these problems, a structure has been devised in which a punch mechanism is provided inside the mold on the film supply side. In this case, first, marks such as round holes and protrusions are formed on the film by a punch mechanism. Next, when a mark is detected by a sensor provided at a distance equal to the delivery amount from the punch mechanism, the film supply is stopped. However, according to this configuration, it is necessary to provide a punch mechanism in the mold, a separate step of driving the punch mechanism is required, and it is necessary to change the position of the sensor when changing the delivery amount. However, there is a problem that the detection of the mark becomes unstable due to the wobbling in the width direction accompanying the film feeding.

The present invention has been made to solve the above-described problems, and when a film is used to seal an electronic component with a resin, the film is supplied in an accurate delivery amount. And to provide a supply method.

[0005]

In order to solve the above-mentioned technical problems, the film supply apparatus according to the present invention is used when resin-sealing an electronic component mounted on a substrate by a die facing each other. The roll on the delivery side that sends out the film between the molds, the roll on the winding side that winds the film, and the film between the molds by driving at least one of the roll on the delivery side and the winding side. A film supply device having a supply motor, which detects a rotation amount of a length measurement roller which is provided between a delivery side roll and a winding side roll and which is rotated by the delivered film. A sensor that generates a signal corresponding to the rotation amount and a rotation amount is calculated based on the signal received from the sensor, and a signal that stops the motor is generated when the rotation amount reaches a set value. Characterized by comprising a control unit.

According to this, the amount of rotation of the length measuring roller rotated by the fed film is calculated based on the signal generated by the sensor. Therefore, the amount of film sent out, that is, the amount of film sent out is accurately calculated. When the amount of rotation of the length measuring roller reaches the set value, the film supply motor is stopped by stopping the film supply motor. With these,
The film is accurately fed by a preset delivery amount.

Also, the film supply method according to the present invention is
A delivery-side roll that delivers a film used between resin molds to seal electronic parts mounted on a substrate with a die facing each other, a winding-side roll that winds a film, and a delivery side And a film feeding method using a motor that feeds the film between the molds by driving at least one of the rolls on the winding side, the film being fed by the rolls on the winding side while feeding the film from the roll on the sending side. A step of winding the film, a step of calculating the rotation amount of the length measuring roller rotated by the fed film, and a step of generating a signal for stopping the motor when the calculated rotation amount reaches a set value. It is characterized by having.

According to this, based on the signal generated by the sensor, the amount of rotation of the length measuring roller rotated by the fed film is calculated. Therefore, the amount of film sent out, that is, the amount of film sent out can be accurately calculated. Further, when the rotation amount of the length measuring roller reaches the set value, the film supply is stopped by stopping the motor for supplying the film. As a result, the film can be accurately supplied by the preset delivery amount.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A film supply apparatus and a supply method according to the present invention will be described below with reference to FIG. Figure 1
FIG. 3 is a perspective view showing the structure of a film supply device according to the present invention. In FIG. 1, a film 1 is a continuous film-like member stretched between opposing dies (not shown) for the purpose of ensuring releasability and transferring to a molded product. The film 1 is delivered from the delivery-side roll 2 and functions as a length-measuring roller 3 and a tension roller 4, which function so as to give a constant tension to the film 1.
It is taken up by the take-up side roll 7 via 5 and 6 in sequence. The delivery side roll 2 is attached to a delivery shaft 8, and the delivery shaft 8 is fixed to the shaft of a delivery motor 9. Similarly, the winding-side roll 7 is attached to the winding shaft 10, and the winding shaft 10 is fixed to the shaft of the winding motor 11. The feeding motor 9 and the winding motor 11 are, for example, servo motors that rotate according to the received signal.

The length-measuring roller shaft 12 is a rotating shaft of the length-measuring roller 3 and is attached to the shaft of the encoder 13. The encoder 13 is a rotary sensor that converts the amount of rotation of the length-measuring roller shaft 12, that is, the angle, into an electrical pulse and supplies the pulse to the control unit 15 via the signal line 14. The controller 15 uses the encoder 1
The rotation amount of the length-measuring roller shaft 12 is calculated based on the number of pulses received from the motor 3, and in a predetermined case, the feeding motor 9
It is a control means for stopping the winding motor 11 and the winding motor 11. The signal lines 16 and 17 are wirings that connect the control unit 15 to the delivery motor 9 and the winding motor 11, respectively.

The operation of the film supply apparatus of FIG. 1 will be described. First, the control unit 15 starts the supply of the rotation signal to the feeding motor 9 and the winding motor 11. As a result, the feeding motor 9 and the winding motor 11 rotate,
As indicated by the arrow in FIG. 1, the film 1 is sent out from the delivery side roll 2 and wound up by the winding side roll 7. Therefore, the film 1 is supplied in a stretched state between the molds (not shown) facing each other. Here, the encoder 13 is a rotation amount of the length measuring roller 3 rotated by the film 1, that is, the length measuring roller shaft 12
A pulse is generated according to the rotation amount of, and the pulse is supplied to the control unit 15.

The control section 15 counts the pulses received from the encoder 13. The number of pulses generated by the encoder 13 and the rotation amount of the length measuring roller shaft 12 (= the length measuring roller 3
Relationship with the rotation amount) is predetermined. Further, from the rotation amount of the length measurement roller 3 and the outer peripheral length of the length measurement roller 3, the delivery amount of the film 1 corresponding to the rotation amount is calculated. Therefore, the control unit 15 counts the pulses to calculate the rotation amount of the length-measuring roller 3, and thus the delivery amount of the film 1.

On the other hand, the control unit 15 has a predetermined film 1
The preset value of the number of pulses, that is, the preset value of the rotation amount of the length-measuring roller 3 is stored in correspondence with the delivery amount of the. Then, the control unit 15 compares the count value of the number of pulses with the set value. As a result, when the count value reaches the set value, the control unit 15 generates a stop signal for the sending motor 9 and the winding motor 11 and sends them to the signal lines 16 and 17, respectively. And supply. Therefore, when the film 1 is sent out by the sending amount corresponding to the set value of the pulse number, the supply of the film 1 is stopped.

Here, the first feature of the present invention is that one of the rollers functioning to give a constant tension to the film 1 is used as the length measuring roller 3, and the number of pulses detected by the encoder 13 is That is, the delivery amount of the film 1 is calculated based on the count value, that is, the rotation amount of the length measuring roller 3. The second feature is that the control unit 15 compares the count value of the pulse number with the set value, and when the count value reaches the set value, stops the feeding motor 9 and the winding motor 11. Then, the supply of the film 1 is stopped.

As described above, according to the present invention, the delivery amount of the film 1 is calculated based on the count value of the number of pulses detected by the encoder 13, and when the count value reaches the set value. Supply of the film 1 is stopped. Therefore, a mechanism for forming a mark on the film 1 is not necessary, and the film 1 can be supplied in an accurate delivery amount. Further, the feeding amount of the film 1 can be easily changed by changing the set amount. Furthermore, the film 1 can be accurately supplied even when a shake in the width direction occurs due to the feeding of the film 1.

Although the rotary encoder 13 is used in the above description, other sensors that convert the rotation amount into a constant physical amount such as the number of pulses or electric resistance may be used.

Further, the shaft of the encoder 13 is fixed to the length measuring roller shaft 12 of FIG. Not limited to this, film 1
It is also possible to fix the shaft of the encoder 13 to the shaft of any one of the tension rollers 4, 5 and 6 that functions to apply a constant tension to the shaft. Further, the shaft of the encoder 13 may be fixed to one of the tension rollers 28 and 29 shown in FIG.

Further, the feeding motor 9 and the winding motor 11
However, the present invention is not limited to this and may be any motor whose rotation is accurately controlled by the control unit 15.

Further, the feeding motor 9 and the winding motor 11
And the control unit 15 generates a signal for stopping both motors. The present invention is not limited to this, and a clutch mechanism may be provided between the winding shaft 10 and the shaft of the winding motor 11 while the control unit 15 generates a signal to stop the motor 9. In this case, the feeding motor 9 is stopped and the rotation of the winding motor 11 is not transmitted to the winding shaft 10.
Also stop.

Further, if conditions such as the torque of the motor to be used permit, a motor is provided only on the winding shaft 10 and the control unit 1
It is also possible for 5 to control this motor.

Further, the present invention is not limited to the above-described embodiment, and can be arbitrarily and appropriately modified / selected and adopted within a range not departing from the gist of the present invention. Is.

[0022]

According to the present invention, the sensor generates a signal corresponding to the rotation amount of the length measuring roller rotated by the fed film, and the rotation amount calculated based on the signal reaches the set value. In that case, the motor for supplying the film is stopped. As a result, the film can be supplied by an accurate feed amount based on the detected rotation amount of the length measuring roller. Therefore, the present invention has an excellent and practical effect of providing a film supply device and a supply method for supplying a film in an accurate delivery amount.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of a film supply device according to the present invention.

FIG. 2 is a partial cross-sectional view showing the structure of a conventional film supply device.

[Explanation of symbols]

1 film 2 Sending side roll 3 Length measuring roller 4, 5, 6 tension roller 7 Roll on the winding side 8 Sending shaft 9 Sending motor (motor) 10 winding shaft 11 Winding motor (motor) 12 Roller shaft for length measurement 13 Encoder (sensor) 14 signal lines 15 Control unit 16,17 signal line

Claims (2)

[Claims] 1. A delivery-side roll that feeds a film used when resin-sealing an electronic component mounted on a substrate by dies facing each other, and a winding-up roll that winds the film. A film supply device having a side roll and a motor for supplying the film between the molds by driving at least one of the delivery side and the winding side roll, wherein the delivery side roll A length measuring roller provided between the winding side roll and rotated by the fed film, and a sensor that detects a rotation amount of the length measuring roller and generates a signal according to the rotation amount. A control unit that calculates the rotation amount based on a signal received from the sensor and that generates a signal that stops the motor when the rotation amount reaches a set value. Film supply device. 2. A delivery-side roll that feeds a film, which is used when resin-sealing an electronic component mounted on a substrate by dies facing each other, and a winding-up roll that winds the film. A film supply method using a side roll and a motor for supplying the film between the molds by driving at least one of the delivery side and the winding side roll, wherein the delivery side roll The step of winding the film by the winding side roll while sending out the film from the step of calculating the amount of rotation of the length measuring roller rotated by the sent out film, and the calculated amount of rotation being a set value And a step of generating a signal for stopping the motor.