JP2595492B2 - Liquid discharge device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid ejecting apparatus used for applying a resin or the like.

[0002]

2. Description of the Related Art A liquid discharge apparatus conventionally used for applying a resin or the like is set such that a constant amount of liquid is always discharged at a constant temperature in one discharge step. However, the viscosity of the liquid material changes in accordance with a change in the temperature of the outside air, which may cause a change in the discharge amount per operation.

Therefore, there is a liquid discharging apparatus in which a temperature control means is provided on the outer periphery of a container portion of a dispenser so as to keep the temperature of the liquid in the container constant. In addition, for example, when a liquid material is discharged onto a substrate, a hot plate for heating the substrate is provided to keep a state of the liquid material on the substrate constant, and the substrate is placed on the hot plate. There is an apparatus that discharges a liquid material.

[0004]

When temperature control means is provided on the outer periphery of the container of the dispenser, the liquid material in the container is maintained in a constant state (viscosity), but is supplied from the container to the nozzle. At the time of actual discharge, the temperature of the liquid material is not controlled, and the viscosity of the liquid material changes at the nozzle portion, and the rate of adhesion to the inner wall of the nozzle portion fluctuates. Discharge characteristics cannot be obtained. When a hot plate for mounting a substrate is provided, the heat of the hot plate is transmitted to the liquid material in the nozzle portion, and the viscosity may change to change the discharge amount.

As described above, since the temperature is not adjusted in the nozzle portion of the dispenser that actually discharges the liquid material, it is difficult to always stably discharge the liquid material in the same amount.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid discharge apparatus capable of stably discharging an equal amount of liquid while maintaining a constant temperature of the liquid during discharge.

[0007]

In order to achieve the above object, a liquid discharge apparatus according to the present invention includes a container for storing a liquid and a nozzle communicating with the container and discharging the liquid. It has a dispenser and first temperature control means provided on the outer periphery of the nozzle portion.

The first temperature adjusting means comprises a nozzle receiver located near the outer periphery of the nozzle portion, and a communication hole provided in the nozzle receiver and through which a temperature adjusting fluid is passed.

A second temperature control means is provided on the outer periphery of the container.

[0010]

1 to 4 show one embodiment of a liquid discharging apparatus according to the present invention. This liquid material discharge device has a dispenser A, a second temperature control means B, a first temperature control means C, and an air injection means D. FIG. 1 is a side view and FIG. Is shown. Dispenser A is a hollow cylindrical container portion 1 in which a liquid material is stored.
And a small-diameter nozzle portion 2 provided at the end of the container portion 1 and communicating therewith. The liquid material (the molten resin) in the container portion 1 passes through the nozzle portion 2 by a cylinder mechanism (not shown). It is discharged to the outside. In this embodiment, the nozzle 2 is a needle 2a through which a liquid material flows.
And a pipe 2b located on the outer periphery of the needle 2a. The amount of the liquid discharged by one drive of the cylinder mechanism is set to be always constant at a constant temperature.

A second temperature control means B is provided so as to surround the outer periphery of the dispenser A. The configuration of the second temperature adjusting means B will be described. The inner cylindrical body 3 and the outer cylindrical body 4 are fixed to each other by bolts 5 in a state of being in close contact with each other. A spiral groove is engraved on the outer peripheral surface of the inner cylindrical body 3 (the surface in contact with the outer cylindrical body 4), and is joined to the inner peripheral surface of the outer cylindrical body 4 to form a spiral water pipe 6.
Are formed. The spiral water pipe 6 is formed so as to meander from the upper part of the second temperature control means B to the lower part and then to the upper part again, and a pair of open ends near the upper end of the second temperature control means B. 6a and 6b are provided. Tubes 7a and 7b are connected to the open ends 6a and 6b, and a temperature control fluid (such as heated oil or hot water) flows into the open end 6a from one of the tubes 7a. After falling while meandering, it rises again and flows out of the other open end 6b into the tube 7b. Both cylinders 6
Seal rings 8 are attached to the upper and lower ends of the joints a and 6b.

Below the second temperature control means B and outside the nozzle portion 2 of the dispenser A, the first temperature control means shown in FIG.
Is provided. The first temperature control means C is attached to a lower end of the second temperature control means B, and has a communication end with a nozzle receiver 13 which is formed in a cylindrical shape and has a front end covering the outer periphery of the pipe 2b of the nozzle part 2. (Water pipe)
9. Describing the structure of the communication hole 9, openings 9 a and 9 b are provided on both sides (left and right in FIG. 3) of the nozzle receiver 13, and downward from the openings 9 a and 9 b (toward the tip of the nozzle 2). Pores 9c and 9d are respectively formed toward
c and 9d communicate with both ends of a groove 9e formed on the outer surface of the pipe 2b by a half circumference (left side in FIG. 4). A supply pipe 10a for a temperature controlling fluid is connected to one opening 9a, and a discharge pipe 10b is connected to the other opening 9b. Therefore, the temperature control fluid flows from the supply pipe 10a into the pores 9c through the openings 9a,
After passing around the pipe 2b halfway through the groove 9e, the fine hole 9d
Through the opening 9b to the discharge pipe 10b. As described above, when the temperature control fluid passes through the groove 9e, the liquid material in the needle 2a located inside the pipe 2b is heated or cooled.

In this embodiment, an air injection means D shown in FIG. 4 is provided. The air jetting means D includes the above-described nozzle receiver 13 and the air passage 11. The air passage 11 is provided with the groove 9e of the nozzle receiver 13.
It is provided on the opposite side (the right side in FIG. 4) from the formation position, and includes an opening 11a and a communication hole 11b communicating the opening 11a with the inside of the pipe 2b. Opening 11
The air supply pipe 12 is connected to a. Therefore,
The air supplied from the air supply pipe 12 through the opening 11a enters the inside of the pipe 2b after passing through the flow hole 11b, and has an annular shape formed between the inner peripheral surface of the pipe 2b and the outer peripheral surface of the needle 2a. It is injected downward in the gap.

The operation of the above embodiment will be described below. A liquid material to be discharged (a resin in a molten state) is stored in advance in the container portion 1a of the dispenser A, and a fluid (oil, hot water, or the like) having a predetermined temperature is supplied to the spiral water pipe 6 of the second temperature control means B. Is circulated to keep the temperature inside the container constant and the viscosity of the liquid material constant. At the same time, the same temperature control fluid as that supplied to the spiral water pipe 6 is circulated through the communication hole 9 of the first temperature control means C. In this state, a cylinder mechanism (not shown) is driven to cause the liquid material in the container portion 1 to pass through the needle 2a of the nozzle portion 2 and to be discharged from its tip onto a substrate (not shown). By the temperature adjusting fluid circulating in the communication hole 9, the liquid material passing through the needle 2a is kept at a constant temperature and does not change in viscosity until immediately before the discharge, so that the same amount can be always discharged under the same conditions.

When the discharge of the liquid material is completed by the above-described process, the dispenser A is moved to a cleaning position provided at a position distant from the substrate mounting position, and the air passage is passed through the air supply pipe 12 by a pump (not shown) or the like. Air is supplied to 11. If the liquid material remains without being completely discharged from the tip of the needle 2a and becomes solid or solid with the liquid material attached, the air passage 1
The liquid remaining at the tip of the needle 2a is blown off and dropped by the air ejected from 1 and discharged downward in the gap between the outer peripheral surface of the needle 2a and the inner peripheral surface of the pipe 2b. Thereby, it is possible to prevent defects such as nozzle clogging and variations in discharge amount and discharge characteristics caused by the liquid material adhering to the tip of the needle 2a. In performing the actual work, it is set so that air injection is always performed at the start or end of the work, or air injection is performed periodically after performing a predetermined number of discharges of the liquid material.

The first temperature adjusting means C according to the present invention comprises a temperature adjusting means.
The temperature of the liquid can be freely adjusted by arbitrarily setting the temperature of the nodal fluid. For example, in the above-described embodiment, the oil or the like heated to the communication hole 9 is supplied to heat the liquid material in the nozzle portion 2. However, when a hot plate is used, the heat of the hot plate is transmitted to the nozzle portion 2. Therefore, it is used to supply a cold water to the communication hole 9 to suppress a rise in the temperature of the liquid material contrary to the above embodiment.

The second temperature adjusting means B is not limited to the one using a fluid, and is configured to arrange a heating wire on the outer periphery of the container portion 1 for heating, or to a Peltier device for cooling. Various configurations such as a configuration using a (semiconductor heat exchange element) can be adopted.

In the above embodiment, the second temperature control means B and the first temperature control means C are completely independent from each other. For example, the temperature control fluid circulating through the spiral water pipe 6 is directly connected. It is also possible to adopt a configuration in which both are connected, for example, by supplying the holes 9.

In the above embodiment, the air injection means D
Has a configuration in which air is blown from a not-shown air pump or the like to the tip of the nozzle portion 2 through the fine air passage 11, but is not limited to this. Various modifications are possible, such as arranging the outlet so as to be located near the nozzle portion at the cleaning position.

[0020]

According to the liquid discharging apparatus of the present invention, the temperature of the liquid can be controlled until immediately before the liquid is discharged from the nozzle by the first temperature control means provided on the outer periphery of the nozzle. Liquid material can always be discharged in equal amounts without being influenced by the temperature of the liquid.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of a liquid discharge device according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a sectional view taken along line YY of FIG. 3;

[Explanation of symbols]

 Reference Signs List A dispenser B second temperature control device C first temperature control device 1 container part 2 nozzle part 9 communication hole (water pipe) 13 nozzle receiver

Claims (2)

(57) [Claims] A dispenser including a container for storing the liquid material, a nozzle for discharging the liquid from the container , a nozzle receiver positioned near an outer periphery of the nozzle,
Communication for passing the temperature control fluid provided in the nozzle receiver
And a first temperature control means constituted by a hole . 2. A temperature control means on the outer periphery of the container.
Liquid material discharge device according to claim 1 is provided.