JP2002079161A - Dispenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize the constitution of a syringe part for discharging a paste, to enlarge the range of fine control by performing control taking account of the revolution speed of a motor and to monitor the remaining quantity of the paste in the syringe. SOLUTION: The syringe 1 and a piston driving part 3 are formed into separated bodies, the piston driving part 3 and a piston 2 are connected with a power transmission part 4 and the movement of the piston 2 is controlled by controlling the revolution quantity and the revolution speed of the motor 5 of the piston driving part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dispenser which discharges and supplies a paste filled in a syringe from the syringe with a piston.

[0002]

2. Description of the Related Art For example, in a manufacturing process of a semiconductor device, there is a pellet bonding step of bonding a semiconductor element pellet to a member such as a lead frame on a ceramic substrate, and an Ag (silver) pellet is used as an adhesive material.

FIGS. 2A and 2B show an example of a dispenser disclosed in Japanese Patent Application Laid-Open No. 58-127335.

[0004] The dispenser shown in FIG.
The Ag paste P in the cylinder 20 is maintained at a predetermined temperature by the action of the thermostat 21, so that a change in viscosity or volume due to a change in temperature of the outside air is suppressed.

When the worm 23 is rotated by a predetermined angle by the motor 22 and the movable arm 24 is lowered, the piston 25 integrated therewith is lowered by a predetermined stroke. This lowering of the piston 25 causes the cylinder 2
The Ag paste P in the cylinder 0 is pushed out from the discharge port 20a of the cylinder 20.

[0006] In the dispenser shown in FIG.
Has a close relationship with the rotation angle of the worm 23
, That is, the rotation angle of the motor 22 is controlled to control the supply amount of the Ag paste P.

In the dispenser shown in FIG. 2B, a temperature sensor 26 is attached to a part of the outer periphery of the cylinder 20 to detect the temperature of the cylinder 20, and the controller 27 controls the motor 22 according to the detected value. It controls the rotation angle.

[0008]

However, the dispenser disclosed in Japanese Patent Application Laid-Open No. 58-127335 shown in FIG. 2 has a motor 22 for driving and controlling the piston 25 in the cylinder 20 and a structure accompanying the control of the motor 22. Since the components are integrated with the cylinder 20, the configuration of the cylinder portion is increased in size, and there is a problem that it is difficult to assemble it with other models with versatility.

The discharge amount of the Ag paste P is
It is adjusted by controlling only the rotation amount of 2,
Since the adjustment is not performed in consideration of the rotation speed of the motor 22, there is a problem that the adjustment range of the fine adjustment is narrowed.

Further, when the cylinder 20 is replaced, since the drive unit including the piston 25 is integrated with the cylinder 20, there is a problem that the replacement work of the cylinder 20 is inferior.

An Ag paste P using a piston 25
, The supply of the paste P is stabilized, but since the remaining amount of the paste P remaining in the cylinder 20 is not taken into consideration, the paste P which has expired in the cylinder 20 is not used.
Is expected to remain, and the quality of the paste P deteriorates.
Is expected to be supplied.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the size of a syringe portion for discharging a paste, expand a fine adjustment range by adjusting the rotation speed of a motor in consideration of the rotation speed of a motor, and maintain a paste remaining in a syringe. It is to provide a dispenser adapted to monitor the amount.

[0013]

In order to achieve the above object, a dispenser according to the present invention is a dispenser that discharges and supplies a paste filled in a syringe from the syringe with a piston, wherein the syringe and the piston driving unit are connected to each other. The piston drive unit and the piston are connected separately by a power transmission unit, and a rotation amount and a rotation speed of a motor of the piston drive unit are adjusted to control movement of the piston. .

The power transmission unit includes a flexible wire, a ball screw shaft, and a slide shaft. The flexible wire transmits a rotational driving force of the piston driving unit to the ball screw shaft. The ball screw shaft receives the rotational driving force from the flexible wire and feeds the slide shaft, and the slide shaft receives the feed from the ball screw shaft and slides the piston into the syringe. It is. The power transmission unit converts the rotational motion of the piston drive unit by a motor into a linear motion of the piston and transmits the power.

Further, the apparatus further includes a remaining amount detecting section for detecting a remaining amount of the paste remaining in the syringe, and the piston driving section detects the remaining amount of the paste from the remaining amount detecting section. The movement of the piston is controlled via the power transmission unit on the basis of the detected data.

The remaining amount detecting section includes an upper limit sensor for detecting an upper limit liquid amount in the syringe, a lower limit sensor for detecting a lower limit liquid amount in the syringe, and the piston in accordance with the liquid amount in the syringe. And a liquid level sensor that moves integrally with the piston, based on a positional relationship between the liquid level sensor and the upper limit sensor and the lower limit sensor, detects a liquid level position of the paste in the syringe with which the piston is in contact. To calculate the remaining amount of paste.

Further, a pulse motor is used as the motor of the piston drive unit, and the pulse motor is pulse-controlled.

Further, the amount of paste discharged from the syringe is controlled by changing the number of pulses of one shot applied to the pulse motor and the rotation speed.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a dispenser according to the present invention. The dispenser according to the present invention shown in FIG. 1 discharges and supplies the paste P filled in the syringe 1 from the syringe 1 with the piston 2.

According to the present invention, the syringe 1 and the piston drive 3
And a power transmission unit 4 connects the piston drive unit 3 and the piston 2 to each other, and a motor 5 of the piston drive unit 3
The movement of the piston 2 is controlled by adjusting the rotation amount and the rotation speed of the piston 2.

Therefore, according to the present invention, the syringe 1 and the piston drive unit 3 are formed separately,
And the piston 2 are connected by the power transmission unit 4, so that the configuration of the syringe part for discharging the paste P can be reduced in size, the mounting area can be reduced as much as possible, Can be easily assembled to other models with versatility without changing.

When the syringe 1 is replaced, since the syringe 1 and the piston drive unit 3 are formed separately, unlike the conventional case, only the syringe 1 is removed without removing the piston drive unit 3. The replacement of the syringe 1 can be performed, and the replacement operation can be easily performed.

Next, a specific example of the present invention will be described in detail with reference to FIG.

In FIG. 1, a power transmission section 4 connecting the piston drive section 3 and the piston 1 includes a flexible wire 6, a ball screw shaft 7, and a slide shaft 8.
It is comprised including.

The syringe 1 is held in a vertical position on a syringe support frame 9 with the paste discharge port 1a facing downward, and a piston 2 is set in the syringe 1 so as to be slidable in the vertical direction. The rotation of the piston 2 is restricted in the syringe 1.

A ball screw shaft 7 is rotatably held about the vertical axis as a rotation axis between the upper seat 9a and the lower seat 9b of the syringe support frame 9. One end 6a of the flexible wire 6 is connected to the ball screw shaft 7, The other end 6b is connected to the motor 5 of the piston drive unit 3 via the transmission 11.

In the example shown in FIG. 1, a pulse motor is used as the motor 5 of the piston drive unit 3 and the pulse motor 5 is pulse-controlled.
The discharge amount of the paste P from the syringe 1 is controlled by changing the number of shot pulses and the rotation speed.

The piston drive unit 3 includes, in addition to the motor 5,
It includes a power supply unit 3b, a rotation speed control unit 3c for changing the rotation speed of the motor 5, a power switch 3d, and a control unit 3a. The control unit 3a includes a rotation speed control unit 3c.
The rotation amount and the rotation speed of the motor 5 are controlled by inputting an operation signal from the power switch 3d and remaining amount detection data from the remaining amount detection unit 12, which will be described later.

A seat 9c is supported on the syringe support frame 9 so as to be slidable in the vertical direction, and a nut 10 mounted on the seat 9c is screwed into a screw portion of the ball screw shaft 7, and the rotational driving force of the ball screw shaft 7 Is received by the nut 10, and the nut 10 moves the seat 9c up and down.

The slide shaft 8 has an upper end 8a fixed to a seat 9c and a lower end 8b connected to the piston 2.

Accordingly, the flexible wire 6 transmits the rotational driving force of the piston drive unit 3 to the ball screw shaft 7, and the ball screw shaft 7
The slide shaft 8 receives the rotation driving force from the ball screw shaft 7 to feed the slide shaft 8, and slides the piston 2 into the syringe 1 by receiving the feed from the ball screw shaft 7.

Further, the syringe 1 has a remaining amount detecting section 12 for detecting the remaining amount of the paste P remaining in the syringe 1 by using the remaining amount detecting section 12. The movement of the piston 2 is controlled via the power transmission unit 4 based on the detection data from the remaining amount detection unit 12.

The remaining amount detector 12 includes an upper limit sensor 12a for detecting an upper limit liquid amount in the syringe 1, a lower limit sensor 12b for detecting a lower limit liquid amount in the syringe 1, and a sensor according to the liquid amount in the syringe 1. The paste P in the syringe 1 includes a liquid level sensor 12c that moves integrally with the piston 2 and is in contact with the piston 2 based on the positional relationship between the liquid level sensor 12c and the upper limit sensor 12a and the lower limit sensor 12b.
Is detected to detect the remaining amount of the paste P, and the remaining amount detection data is output to the control unit 3 a of the piston driving unit 3.

The lower limit sensor 12a is installed at a liquid level where the remaining amount of the paste in the syringe 1 becomes zero. However, the lower limit sensor 12a is not necessarily limited to this liquid level. The lower end surface of the piston 2 is formed so as to conform to the inner shape of the paste discharge port 1a of the syringe 1 so that the paste P in the syringe 1 can be completely discharged without being left.

Next, the operation of the present invention will be described. FIG.
As shown in the figure, the syringe 1 filled with the Ag paste P
Is set using the syringe support frame 9 at a place where pellet bonding is performed by the pellet bonding apparatus 13, for example, and the piston driving section 3 is set at a position away from the pellet bonding section of the pellet bonding apparatus 13 and power is transmitted therebetween. The connection is made at the part 4. In addition, the remaining amount detecting unit 12 is reset, the liquid level of the paste P in the syringe 1 in contact with the piston 2 is detected by the liquid level sensor 12c, and the height position of the liquid level is used as a reference liquid level. Position.

The upper limit liquid level position in the syringe 1 when the reference liquid level position is set is detected by the upper limit sensor 12a. Further, the position of the liquid level where the remaining amount of the paste in the syringe 1 becomes zero is detected as a stage before filling the syringe 1 with the paste P.

The remaining amount detection data from the remaining amount detecting section 12 is output to the control section 3a of the piston driving section 3.

Control section 3a of piston drive section 3
Sets the time and speed of the discharge condition of the paste P from the syringe 1 based on the input signals from the remaining amount detection unit 12 and the rotation speed control unit 3c, and starts the discharge of the paste.

The motor 5 of the piston drive unit 3 controls the control unit 3a based on a control signal from the control unit 3a.
Is driven in accordance with the set values of the rotation amount (time) and the rotation speed set by the user, and transmits the rotation driving force to the flexible wire 6.

The flexible wire 6 transmits the rotational driving force of the piston drive unit 3 to the ball screw shaft 7, and the ball screw shaft 7 receives the rotational driving force from the flexible wire 6 to feed the slide shaft 8, and the slide shaft 8 The piston 2 is slid into the syringe 1 in response to the feed from the ball screw shaft 7.

Based on these series of movements, it is confirmed whether or not the discharge amount of the paste P discharged from the syringe 1 is an appropriate amount, and the rotation amount and the rotation speed of the motor 5 are adjusted until the discharge amount becomes an appropriate amount. The control unit 3a of the piston driving unit 3 changes the discharge amount of the paste P to an appropriate amount.
In response to a paste supply command from the pellet bonding apparatus 13, a paste discharge command is issued.

The flexible wire 6 rotated by a predetermined amount in the above-described series of operations is twisted due to a ball screw driving load, and a slight time lag occurs. However, since the time lag is eliminated within the time for lowering the syringe 1 to the paste application position on the substrate or the like, the discharge amount does not change.

The discharge of the paste P proceeds, and the piston 1
Lowers in the syringe 1 and the remaining amount of the paste P in the syringe 1 becomes zero, the lower limit sensor 12c detects the lower limit sensor 12c, and based on the detection data, the piston driving unit 3 stops the motor 5 and Stop the discharge.

As described above, according to the present invention, the syringe 1
Since the remaining amount of the paste P is monitored in the inside, it is possible to prevent the paste P whose expiration date has passed from remaining in the cylinder 20 and the like, and to avoid a situation in which the paste P with deteriorated quality is supplied. Further, the piston 1 is not slid forcibly in a state where the inside of the syringe 1 is empty, so that an accident that lowers the sealing performance can be prevented.

Further, the remaining amount detecting unit 1 is connected to the piston driving unit 3.
Since the remaining amount detection data from the second piston 2 are sequentially input, the positional relationship of the piston 2 can be easily and accurately recognized, thereby enabling accurate remaining amount detection and improving quality.

Further, since the remaining amount of the paste in the syringe 1 is monitored, the amount of paste waste can be reduced.

The power transmission unit 4 transmits the rotational motion of the piston drive unit 3 by the motor through the flexible wire 6 to the ball shaft 7 and the slide shaft 8.
The power is transmitted by converting the linear motion of the piston into the linear motion of the piston, but a push-pull type power transmitting unit that transmits the power by converting the rotational motion of the piston drive unit by the motor into the linear motion of the piston may be used. It is. In this case, the power transmission unit 4 converts the rotational motion of the piston drive unit by the motor into a push-pull linear motion using a cable such as a piano wire, and transmits the linear motion to the piston. Can be used. A hydraulic cylinder may be used instead of the cable such as the piano wire. In this case, the hydraulic cylinder is configured such that a hollow pipe is filled with oil or the like and both ends are sealed with small pistons, and is configured to output power by linear motion to the small piston. Note that any push-pull type power transmission unit may be used as long as the power can be transmitted by converting the rotational motion of the piston drive unit by the motor into the linear motion of the piston.

[0049]

As described above, according to the present invention, the configuration of the syringe portion for discharging the paste can be reduced in size, and the adjustment range of the fine adjustment can be adjusted by taking the rotation speed of the motor into consideration. And the amount of paste remaining in the syringe can be monitored.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a dispenser according to the present invention.

FIG. 2 is a configuration diagram showing a dispenser according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Syringe 2 Piston 3 Piston drive part 4 Power transmission part 5 Motor 6 Flexible wire 7 Ball screw shaft 8 Slide shaft

Claims (7)

[Claims] 1. A dispenser which discharges and supplies a paste filled in a syringe from the syringe by a piston, wherein the syringe and the piston drive unit are formed separately, and power is supplied between the piston drive unit and the piston. A dispenser, wherein the dispenser is connected by a transmission unit, and controls movement of the piston by adjusting a rotation amount and a rotation speed of a motor of the piston driving unit. 2. The power transmission unit includes a flexible wire, a ball screw shaft, and a slide shaft, and the flexible wire transmits a rotational driving force of the piston driving unit to the ball screw shaft. The ball screw shaft receives the rotational driving force from the flexible wire and feeds the slide shaft. The slide shaft receives the feed from the ball screw shaft and slides the piston into the syringe. The dispenser of claim 1, wherein the dispenser is a dispenser. 3. The dispenser according to claim 1, wherein the power transmission unit converts the rotational motion of the piston drive unit by a motor into a linear motion of the piston and transmits the power. 4. A residual amount detecting unit, wherein the residual amount detecting unit detects a residual amount of the paste remaining in the syringe, and the piston driving unit includes a residual amount detecting unit. The dispenser according to claim 1, wherein movement of the piston is controlled via the power transmission unit based on detection data from the dispenser. 5. The apparatus according to claim 5, wherein the remaining amount detection unit includes an upper limit sensor for detecting an upper limit liquid amount in the syringe, a lower limit sensor for detecting a lower limit liquid amount in the syringe, and the lower limit sensor according to the liquid amount in the syringe. A liquid level sensor that moves integrally with the piston, and detects a liquid level position of the paste in the syringe in contact with the piston based on a positional relationship between the liquid level sensor and the upper limit sensor and the lower limit sensor. 2. The dispenser according to claim 1, wherein the remaining amount of the paste is calculated. 6. The dispenser according to claim 1, wherein a pulse motor is used as the motor of the piston drive unit, and the pulse motor is pulse-controlled. 7. The dispenser according to claim 1, wherein a discharge amount of the paste from the syringe is controlled by changing a pulse number and a rotation speed of one shot applied to the pulse motor. .