JP2001212487A - Liquid discharge device and method for controlling discharge quantity of liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a liquid discharge device capable of reducing the variation in the discharge quantity of a liquid. SOLUTION: The discharge device is provided with an image take-in means 1 for outputting the area of paste solder spread to a discharge place, a sequencer 2 for determining the discharge quantity from the output of the image take-in means 1 and outputting a directive value concerned with the discharge quantity by comparing it with a directive value corresponding to the objective discharge quantity, a discharge controller 3 for outputting a discharge command by inputting the value outputted from the sequencer 2 and a dispenser 4 for applying pressure to the paste solder in a syringe 5 by inputting the discharge command from the discharge controller 3 and the distance between the discharge place and a nozzle 5a is set so as to increase the correlation between the area of the paste solder and the discharge quantity.

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 for ejecting a fixed amount of liquid such as cream solder and a method for controlling the ejection amount of the liquid ejecting apparatus.

[0002]

2. Description of the Related Art When soldering a component to a board, for example,
A solder discharge device is installed on the assembly line of the automatic assembly device. After applying a certain amount of cream solder to the component mounting location on the board using the solder discharge device, the components are mounted and put into a reflow furnace to perform soldering. Will be The solder ejection device is configured to apply a predetermined pressure to the paste solder by a sequencer and discharge the paste solder from a nozzle attached to a tip of a substantially cylindrical syringe filled with the paste solder for a predetermined discharge time. ing. If the amount of the paste solder to be discharged is small, for example, the mounting strength of the component is reduced or a connection failure occurs.If the amount of the paste solder to be discharged is large, for example, a short circuit is generated. Need to be done.

[0003]

However, when the paste solder is discharged, the conditions of the time (discharge time) for applying a predetermined pressure to the paste solder and the pressure (discharge pressure) applied to the paste solder, which are controlled by the sequencer, are constant. However, the amount actually discharged from the dispenser of the solder discharge device varies depending on the temperature, the remaining amount of the paste solder in the syringe, the lot of the paste solder, the time when the paste solder is left in the syringe, and the like. was there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a structure of a liquid discharge apparatus capable of reducing a variation in a discharge amount of a liquid such as a paste solder and the like, and a liquid discharge apparatus therefor. An object of the present invention is to provide a discharge amount control method.

[0005]

According to a first aspect of the present invention, there is provided a liquid discharging apparatus for discharging a predetermined amount of liquid from a nozzle provided at a tip of a syringe filled with liquid to a discharge position of a work. An image capturing unit that outputs a value corresponding to the area of the liquid spread at the discharge location, and a value corresponding to the discharge amount from the value output by the image capturing unit, and a value corresponding to the target discharge amount. A sequencer that outputs an instruction value related to a discharge amount in comparison with a discharge controller that inputs an instruction value related to a discharge amount output from the sequencer and outputs a discharge command, and that receives a discharge command from the discharge controller. A dispenser that applies pressure to the liquid in the syringe, so that the value corresponding to the area of the liquid that has spread to the discharge location and the correlation between the amount of the liquid actually discharged are high. The distance between the points out and the nozzle is set is characterized in.

According to a second aspect of the present invention, there is provided a liquid discharge apparatus for discharging a predetermined amount of liquid onto a discharge position of a work, wherein a liquid is filled and a nozzle having a predetermined length is projected downward from a base. A substantially cylindrical syringe with a bottom, a substantially box-shaped syringe holding portion configured to be capable of moving vertically in the vertical direction while holding the syringe substantially vertically therein, and a syringe having a bottomed cylindrical shape and having the bottom surface of the syringe. A holder is fitted into a through hole in a lower end surface of the syringe holding portion, and a stopper protruding downward from a lower end surface of the syringe holding portion,
A work holding plate that is configured to be movable in the vertical direction and that, when the stopper moves downward, the stopper comes into contact with the upper surface and a projecting piece that projects from the lower surface comes into contact with the work; An image capturing unit that outputs a value corresponding to the area of the liquid that spreads, a value corresponding to the discharge amount is obtained from a value output by the image capturing unit, and the value is compared with a value corresponding to a target discharge amount. A sequencer that outputs an instruction value related to a discharge amount, a discharge controller that outputs a discharge command by inputting an instruction value related to a discharge amount output from the sequencer, and a discharge command that is input from the discharge controller and outputs a discharge command. A dispenser for applying pressure to the liquid, wherein the distance between the discharge point of the work and the tip of the nozzle is such that the projecting piece of the work holding plate of the work comes into contact with the nozzle Location, the height difference between the discharge point, the height difference between the lower end surface of the projecting piece and the upper surface of the work holding plate, and the lower end surface of the stopper and the lower part of the syringe holding part. The height difference between the end face, the height difference between the bottom face of the holder and the lower end face of the syringe holding part, and the height difference between the syringe base and the tip of the nozzle. The distance between the discharge point and the tip of the nozzle is set so that the correlation between the value corresponding to the area of the liquid spread to the discharge point and the amount of the liquid actually discharged is increased. It is characterized by having.

According to a third aspect of the present invention, there is provided a discharge amount control method for a liquid discharge apparatus for discharging a predetermined amount of liquid to a discharge position of a work from a nozzle provided at a tip of a syringe filled with liquid. The distance between the discharge point and the tip of the nozzle is set so that the correlation between the value corresponding to the area of the liquid spread to the discharge point and the amount of liquid actually discharged is high. A value corresponding to the area of the liquid spread over the location is determined, and from the value, the discharge amount is estimated to be larger or smaller than the target discharge amount, and the liquid discharge device is configured such that the discharge amount is constant. Is controlled.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a schematic configuration of a liquid ejection apparatus according to the present invention will be described with reference to FIG. In the figure, reference numeral 1 denotes a value corresponding to the area of the liquid which has been discharged and spread to a discharge location such as a substrate. Image capturing means such as an image checker, and 2 denotes a value from the value output by the image capturing means 1 to a discharge amount. Find the corresponding value, compare it with the value corresponding to the desired discharge rate,
A sequencer 3 for outputting an instruction value relating to the discharge amount is a discharge controller which inputs the instruction value relating to the discharge amount output from the sequencer 2 and outputs a discharge command to a dispenser 4 which applies pressure to the liquid. More specifically,
A plurality of instruction values output from the sequencer 2 to the coating controller 3 are set in advance, and the sequencer 2 is configured to select any one of the instruction values and output the selected value to the coating controller 3. The coating controller 3
It is configured to output an application command to the dispenser 4 based on a condition stored in advance in a storage area corresponding to the input instruction value. For example, in a series of storage areas of the coating controller 3, the ejection conditions are stored so that the larger the address of the storage area is, the larger the ejection amount is.
However, the sequencer 2 is configured to output the value of the address to be referred to the coating controller 3 so as to refer to an address having a larger value.

In the liquid discharging apparatus according to the present invention, the area of the liquid which has been discharged and spread to the discharge location of the substrate or the like (or a value corresponding to the area) is obtained by the image capturing means 1, and the discharge amount is determined from the value. If the sequencer 2 determines that the actually ejected amount is smaller than the target ejected amount by estimating whether the amount is larger or smaller than the ejected amount, it instructs the ejection controller 3 to increase the ejected amount. When the actually ejected amount is larger than the target ejection amount, the ejection controller 3 is instructed to decrease the ejection amount, and the liquid supply amount (ejection amount) is quantitatively controlled. . However, since the ejection amount (the volume of the liquid) is estimated from the area of the liquid (or the value corresponding to the area), the correlation between the area of the liquid (or the value corresponding to the area) and the ejection amount (the volume of the liquid) is obtained. If it is not high enough, the discharge amount cannot be controlled accurately. The area of the liquid (or the value corresponding to the area)
The structure of the liquid ejection device for enhancing the correlation with the ejection amount (volume of the liquid) will be described later. First, a method of controlling the ejection amount of the liquid ejection device will be described based on the flowcharts of FIGS.

In the discharge amount control method shown in FIG. 2, the discharge condition is stored in a series of storage areas of the coating controller 3 so that the discharge amount increases as the address of the storage area increases, and the sequencer 2 Is to quantitatively control the ejection amount by changing an address value (application address) output to the application controller 3.

In FIG. 2, first, a discharge operation is performed under the discharge conditions stored in the coating address n, and the image checker 1 serving as an image capturing means is used to spread the area of the liquid (or the liquid area) spread over the discharge location on a substrate or the like. (Value corresponding to the area) is measured.
Specifically, the captured image is processed to determine how many pixels are included in the liquid region. Number of obtained dots W
However, if the value is smaller than the lower limit of the range of the number of dots to be managed twice consecutively, the value of the address value (application address) output from the sequencer 2 to the application controller 3 is increased by 1 (application). Change the address from n to n + 1).

Next, it is determined whether the obtained number of dots W is larger than the upper limit value of the range of the number of dots to be managed twice consecutively, and if it is larger, the sequencer 2 outputs to the coating controller 3. The value of the address value (coating address) to be performed is decreased by 1 (the coating address is changed from n to n-1). If the obtained number of dots W does not fall outside the range to be managed twice consecutively, the ejection operation is continued under the condition stored in the application address n.

Next, different discharge amount control methods of the liquid discharge apparatus will be described with reference to the flowchart of FIG.
The discharge amount control method shown in FIG. 3 is also similar to the discharge amount control method shown in FIG. 2 such that the discharge amount increases in a series of storage areas of the coating controller 3 as the address of the storage area increases. The discharge conditions are stored, and the discharge amount is quantitatively controlled by changing the address value (coating address) output from the sequencer 2 to the coating controller 3.
However, in the case of the ejection amount control method shown in FIG. 3, the captured image is processed to determine how many pixels are included in the liquid region, and whether the determined number of dots W falls within the range to be managed is determined. Judgment is performed, and if it is included, the ejection operation is repeated while the application address remains n, and if the obtained number of dots W is not within the range to be managed, that is, the number of dots W ≧ the upper limit or the number of dots W ≦ the lower limit In some cases, a difference between the number of dots corresponding to the target area and the obtained number of dots W is determined, and how many application address values are changed according to the magnitude of the difference is determined.

For example, the difference w between the number of dots corresponding to the target area and the obtained number of dots W is W1 ≦ w <W2 (W
1, W2 is a constant), the application address value is changed from n to n +
When the difference w is W2 ≦ w <W3 (W2 and W3 are constants), the difference w and the value (increase) to be added to the coating address value are set such that the coating address value is changed from n to n + 2. Is stored in the sequencer 2, and a value (increase) corresponding to the difference w is added to the coating address value n and output to the coating controller 3.

Next, the liquid discharging apparatus will be described with reference to FIG. 4A and 4B are views showing a structure around a syringe of the liquid discharge device, wherein FIG. 4A is a side view, and FIG. 4B is an enlarged view around a nozzle for discharging liquid. In FIG. 4A, reference numeral 5 denotes a syringe having substantially the same structure as that of the syringe, and applies pressure to the solder paste filled therein to discharge the solder paste from the nozzle 5a at the tip, and reference numeral 6 denotes a syringe with the tip side of the syringe 5 downward. A syringe holder 7 for holding the syringe 5 substantially vertically so as to be on the side;
Is a driving device that moves the syringe holding unit 6 in the vertical direction,
Reference numeral 8 denotes a block component which is a work to which a solder paste is applied. Reference numeral 9 denotes a pair of components arranged on both sides of the block component 8 so as to support both ends of the block component 8 from below, and to move the component in the component transport direction of the assembly line. A long guide rail portion 10 for restricting the movement of the component in a direction perpendicular to the guide rail portion 10 is disposed between the pair of guide rail portions 9, and is a transport claw that transports the block component 8 along the guide rail portion 9. is there. In FIG. 4B, reference numeral 11 denotes a work holding plate which is disposed between the guide rail portion 9 and the syringe holding portion 6 so as to be movable in the vertical direction.
And presses the block component 8 from above with the protruding piece on the back side, and the syringe holding portion 6 on the front side.
And restricts the lower limit position of the syringe holding section 6. Further, 12 is a work holding plate 11.
And a positioning pin that is inserted into a pilot hole (not shown) of the block component 8 when the paste solder is applied to position the block component 8 in the horizontal direction.

The work holding plate 11 will be described with reference to FIG. In the drawings, (a) is a plan view, (b) is a view in the direction of arrow A, and (c) is a view in the direction of arrow B. Work holding plate 11
Is a substantially flat rectangular portion having a positioning pin mounting hole 11a for fixing the positioning pin 12, and a substantially L-shaped arm portion 11b projecting in a direction parallel to the surface of the rectangular portion. And A portion (bent portion) from the bent portion at the center of the arm portion 11b to the tip portion is configured to be substantially parallel to one end face of the rectangular portion. Further, the nozzle 5a attached to the syringe 5 is configured to penetrate the notch-shaped portion between the bent portion and the rectangular portion when the paste solder is discharged. Further, a protruding piece 11c protruding to the back surface side facing the block component 8 is formed at the tip of the arm 11b and at the end of the rectangular portion facing the tip.

As shown in FIG. 6, a plunger (piston) is inserted into the syringe 5, and a space between the plunger and the bottom of the syringe 5 is filled with a solder paste. A base 5b is attached to the tip of the syringe 5, and a nozzle 5a is press-fitted into a through hole provided at the center of the base 5b. When the nozzle 5a is clogged or the like, the nozzle 5a is removed from the base 5b and replaced with a new nozzle 5a. Further, a tube for introducing pressure into the syringe 5 is connected to an upper opening of the syringe 5, and the other end of the tube is connected to a dispenser (not shown).

In FIG. 4, the syringe holding portion 6 is screwed into a substantially box-shaped housing 6a for holding the syringe 5 therein, and a screw hole formed in the bottom surface (lower end surface) of the housing 6a. A holder 13 and a stopper 14 for determining a lower limit position when the syringe holding unit 6 moves downward are provided. The holder 13 is a component shown in FIG. 7, and has a through hole 13a on the bottom surface of a substantially bottomed cylindrical main body, and the end on the side where the through hole 13a is provided has a truncated cone shape. It is configured as follows. Further, a screw portion is formed on the end opposite to the side where the through hole 13a is provided, outside the substantially cylindrical main body. The screw portion of the holder 13 is screwed into a screw hole (not shown) formed on the bottom surface (lower end surface) of the housing 6 a of the syringe holding portion 6, and the housing 6 a of the syringe holding portion 6 is screwed.
Mounted on the lower side. As shown in FIG. 7, inside the housing 6a of the syringe holder 6, the syringe 5 is inserted into the opening of the holder 13 with the tip end side down, the nozzle 5a is inserted through the through hole 13a, and the base of the syringe 5 is inserted. The syringe 5 is brought into contact with the syringe holder 6 by bringing the syringe 5 into contact with the bottom of the holder 13.
Attach to In this state, the nozzle 5a is
Is configured to protrude downward.

As shown in FIG. 4 (b), the stopper 8 is constituted by a pair of screws and nuts. One end of a substantially cylindrical screw having a thread groove formed on the entire circumference is connected to a syringe holding portion. The nut 6 is screwed into a screw hole drilled in the bottom surface (lower end surface) of the housing 6a, and the nut is fastened to a screw attached so as to protrude downward from the syringe holder 6. After the nut is loosened and the screw is rotated to adjust the protrusion height of the screw, the nut is brought into contact with the bottom surface (lower end surface) of the housing 6a and tightened. Can be adjusted in the height direction at the other end of the.

Next, the image capturing means will be described with reference to FIG. The image capturing step is a step subsequent to the liquid discharging step, and an image capturing unit is disposed at a position of the image capturing step on the assembly line. As shown in FIG. 8, the CCD camera 1 is placed above the block component 8 to which the paste solder has been applied and which has been conveyed to the position of the liquid discharging step along the guide rail section 9.
4, and a lighting device 15 having a ring-shaped light emitting device are arranged. CCD camera 14 and lighting device 15
Is attached to a supporting column vertically provided at a side position of the guide rail portion 9. The CCD camera 14 is configured to capture an image of the paste solder spread on the block component 8 at the paste solder application position.

Next, the operation of the liquid ejection apparatus will be described with reference to FIG. The block component 8 is conveyed along the guide rail portion 9 so that the paste solder application portion of the block component 8 is located below the nozzle 5a, and the syringe holding portion 6 moves downward. As a result, the nozzle 5a is inserted into the notch-shaped portion between the arm portion 11b of the work holding plate 11 and the rectangular portion, and the stopper 14 of the syringe holding portion 6 comes into contact with the upper surface of the work holding plate 11. . Further, when the syringe holder 6 is lowered, the work holding plate 11
Moves downward, and the protruding piece 11 c projecting to the back side of the work holding plate 11 abuts on the block component 8 to press the block component 8. In this state, the tip of the nozzle 5a is configured to have a predetermined height from the surface of the block component 8 at the paste solder application position.

As described above, the liquid ejecting apparatus of the present invention estimates the ejection amount (volume of the liquid) from the area (or the value corresponding to the area) of the liquid such as the paste solder. Value) and discharge amount (volume of liquid)
Unless the correlation with the value is sufficiently high, the ejection amount cannot be controlled with high accuracy. The liquid ejection device of the present invention sets the distance between the surface of the block component 8 at the paste solder application position and the tip of the nozzle 5a to a predetermined value, thereby reducing the area of the liquid (or a value corresponding to the area). , And the amount of discharge (volume of liquid) is sufficiently high. Based on FIG. 9, the surface of the paste solder application position and the nozzle 5
How the distance to a affects the correlation between the area of the liquid (or the value corresponding to the area of the liquid) and the ejection amount (volume of the liquid) will be described.

FIGS. 9A to 9D show images taken by the CCD camera 14 in four cases where the height of the nozzle 5a is different from each other. FIGS. 9A to 9D are side views of the periphery of the nozzle 5a.
(E) to (h) are images captured by the CCD camera 14 in the cases (a) to (d), respectively. Reference numeral 16 denotes a surface at a paste solder application position.

As shown in (a), when the nozzle 5a is too far from the surface 16 at the paste solder application position,
This shows a state where the paste solder is not applied to the paste solder application position even when a certain amount of paste solder is discharged from the nozzle 5a. In this case, as shown in FIG.
The D camera 14 cannot capture an image of the paste solder. The state shown in (b) shows a state where the paste solder is applied to the paste solder application position, and the paste solder is raised high. In such a state,
Even if the height of the paste solder varies due to the variation in the amount of paste solder discharged, the image shown in (f) cannot capture the variation in the height of the paste solder.

In the case shown in (c), the paste solder discharged from the nozzle 5a is applied to the surface 1 at the paste solder application position.
6 shows a state in which it is spread laterally at a substantially uniform height, which is substantially the same as the difference L in height between the nozzle 6 and the nozzle 5a.
The value obtained by multiplying the area of the paste solder of the image shown in (g) by the difference L is a value sufficiently close to the discharge amount of the paste solder, and the discharge amount of the paste solder and the area of the paste solder of the image captured by the CCD camera 14. (Or a value corresponding to the area) becomes higher. In the liquid ejection apparatus of the present invention, the distance (difference L) between the surface 16 of the block component 4 at the paste solder application position and the tip of the nozzle 5a is set so that the liquid (paste solder) spreads as shown in FIG. Is set. However, since the distance L is considered to change depending on the viscosity of the liquid, the nozzle diameter, and the like, it is necessary to determine the optimum distance L in advance through experiments and the like.

In the case of the liquid ejecting apparatus shown in FIG. 4, a description will be given of which component determines the distance L between the surface 16 of the block component 8 at the paste solder application position and the tip of the nozzle 5a. Here, the position where the protruding piece 11c of the work holding plate 11 abuts on the block component 8 is higher than the paste solder application position, and the height difference is C, and the lower end of the protruding piece 11c is The difference in height from the upper surface of the work holding plate 11 is D. In addition, the syringe holder 6
The lower end of the stopper 14 is located at a position lower than the lower end surface of the housing 6a of the syringe holding part 6, and the difference between the heights is E. Further, it is assumed that the bottom surface inside the holder 13 is disposed at a position lower than the bottom surface (lower end surface) of the housing 6a of the syringe holding portion 6, and the difference in height is F, and the bottom surface inside the holder 13 contacts the bottom surface. Assuming that the difference between the height of the contact surface of the base 5b of the syringe 5 and the height of the tip of the nozzle 5a is G, the distance L between the surface 16 of the block component 8 at the paste solder application position and the tip of the nozzle 5a. Is L =
C + D + E−F−G.

Since the variation of the distance L is one factor of the variation of the discharge amount of the liquid (paste solder), it is necessary to suppress the variation of the distance L.
It is necessary to suppress each variation of G. Dimension C is the component dimension of the block component 8, dimension D is the component dimension of the work holding plate 11, dimension E is the dimension determined by the component dimensions of the housing 6a of the syringe holder 6 and the stopper 14, Since the dimension F is the dimension of the part of the holder 13, the dimensions C to F may be reduced when manufacturing those parts. However, since the nozzle 5a press-fitted into the base 5b of the syringe 5 is a component that is replaced relatively frequently when the nozzle 5a is clogged or the like, the nozzle 5a from the base 5b is
Height (dimension G) must be adjusted. When the nozzle 5a needs to be replaced, the operator performs an operation of removing the old nozzle 5a from the base 5b and press-fitting the new nozzle 5a. If the size for press-fitting the nozzle 5a into the base 5b of the syringe 5 varies, the length from the base 5b of the syringe 5 to the tip of the nozzle 5a varies, which is one factor of the variation of the dimension G. In order to suppress variations in the length from the base 5b to the tip of the nozzle 5a, for example, the press-fitting operation of the nozzle 5a may be performed using a jig shown in FIG.

A substantially cylindrical jig 17 shown in the sectional view of FIG.
Has a substantially cylindrical concave portion at one end in the axial direction, and further has a base housing concave portion 17a having the same axis as the concave portion on the bottom surface of the concave portion. further,
A nozzle insertion hole 17b penetrating the other end of the jig 17 in the axial direction is formed on the bottom surface of the base 17a, and the end face of the other end and the base 17a.
Distance from the base 5b of the syringe 5 to the nozzle 5
It is configured to have a length (dimension G) up to the tip of a. Next, a method for adjusting the protruding length of the nozzle 5a using the jig 17 will be described. First, a new nozzle 5a is slightly pressed into the base 5b, the nozzle 5a is inserted into the nozzle insertion opening 17b from the concave side of the jig 17, and the base 5b is brought into contact with the bottom surface of the base storing recess 17a. As a result, the tip of the nozzle 5a protrudes from the other end of the jig 17 in the axial direction. In this state, the tip of the nozzle 5a is flush with the end face of the other end of the jig 17 in the axial direction. Until
The protruding nozzle 5a is pushed toward the jig 17, and the nozzle 5a
Into the base 5b. As described above, by using the jig 17 shown in FIG. 10, it is possible to easily suppress the variation in the projection length (dimension G) of the nozzle 5a projecting from the base 5b.

[0029]

According to the liquid ejecting apparatus according to the first or second aspect of the present invention or the ejection amount controlling method according to the third aspect, the value corresponding to the area of the liquid spread to the ejection location and the actual ejection amount are determined. The distance between the discharge point and the nozzle that discharges the liquid is set so that the correlation with the amount of the discharged liquid is high, so that the discharge amount of the liquid can be accurately estimated, and the quantitative control of the discharge amount can be performed. Accuracy can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a liquid ejection apparatus according to the present invention.

FIG. 2 is a flowchart illustrating a discharge amount control method according to the present invention.

FIG. 3 is a flowchart showing a different ejection amount control method of the present invention.

FIGS. 4A and 4B are views showing a liquid discharge apparatus according to the present invention, in which FIG. 4A is a side view, and FIG.

5A and 5B are diagrams showing the work holding plate 11, in which FIG. 5A is a plan view, FIG. 5B is a view in the direction of arrow A, and FIG.

FIGS. 6A and 6B are views showing a syringe 5; FIG.
(B) is an enlarged view of a nozzle and a base.

FIG. 7 is a sectional view showing a holder 13;

FIG. 8 is a side view showing an image capturing unit.

FIG. 9 shows how the distance between the surface of the paste solder application position and the nozzle 5a affects the correlation between the area of the liquid (or the value corresponding to the area of the liquid) and the ejection amount (volume of the liquid). (A)-(d) is a side view around the nozzle 5a, and (e)-(h) are
It is a picked-up image of the CCD camera 14 in the cases (a) to (d).

FIG. 10 is a cross-sectional view of a jig used for adjusting a projection length of a nozzle 5a.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image taking-in means 2 Sequencer 3 Discharge controller 4 Dispenser 5 Syringe 5a Nozzle 5b Base 6 Syringe holding part 11 Work holding plate 11c Projecting piece 13 Holder 14 Stopper

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D075 AC06 AC93 AC94 AC95 CA48 DA31 DB01 DC22 EA05 EB60 4F035 AA04 BA22 BB02 BB07 BB13 CA05 CB03 CB13 4F041 AA06 AB01 BA05 BA22 BA35 BA38 BA56 5E319 CD25

Claims (3)

[Claims] 1. A liquid ejecting apparatus for ejecting a predetermined amount of liquid to a discharge point of a work from a nozzle provided at a tip of a syringe filled with liquid, the value corresponding to an area of the liquid spread to the discharge point. And a sequencer that obtains a value corresponding to a discharge amount from a value output by the image capture unit, and outputs an instruction value regarding the discharge amount in comparison with a value corresponding to a target discharge amount. A discharge controller that inputs an instruction value relating to a discharge amount output from the sequencer and outputs a discharge command, and a dispenser that inputs a discharge command from the discharge controller and applies pressure to the liquid in the syringe. The distance between the discharge point and the nozzle is set so that the correlation between the value corresponding to the area of the liquid spread to the discharge point and the amount of liquid actually discharged becomes high. And a liquid ejection device. 2. A liquid-discharging device for discharging a fixed amount of liquid onto a discharge point of a workpiece, wherein the liquid-filled syringe is a substantially bottomed cylindrical syringe having a nozzle of a fixed length projecting downward from a base. A substantially box-shaped syringe holding portion configured to hold the syringe substantially vertically and to be movable in the vertical direction; and a syringe holding portion configured to have a bottomed cylindrical shape and a base of the syringe abutting on a bottom surface thereof. A holder fitted into a through hole in a lower end surface of the portion, a stopper protruding downward from a lower end surface of the syringe holding portion, and a vertically movable member. When the stopper moves downward, an upper surface is formed. The stopper comes into contact with the work side, and a projecting piece projecting from the lower surface side comes into contact with the work, a work holding plate, and an image capturing unit that outputs a value corresponding to the area of the liquid spread to the discharge point, Image importer A sequencer that obtains a value corresponding to the discharge amount from the value output by the stage and outputs an instruction value regarding the discharge amount in comparison with a value corresponding to the target discharge amount, and an instruction value regarding the discharge amount output from the sequencer A discharge controller that inputs a discharge command and outputs a discharge command, and a dispenser that inputs a discharge command from the discharge controller and applies pressure to the liquid in the syringe. The distance is
The position of the work, where the projecting piece of the work holding plate abuts, the size of the difference in height between the discharge location, and the difference in height between the lower end surface of the projecting piece and the upper surface of the work holding plate. Dimensions and
The height difference between the lower end surface of the stopper and the lower end surface of the syringe holder, the height difference between the bottom surface of the holder and the lower end surface of the syringe holder, and the base of the syringe. Determined by the size of the difference in height from the tip of the nozzle, the value corresponding to the area of the liquid spread to the discharge location, and the correlation between the amount of liquid actually discharged and the discharge location A distance between the nozzle and a tip of the nozzle is set. 3. A discharge amount control method for a liquid discharge apparatus for discharging a fixed amount of liquid to a discharge position of a work from a nozzle provided at a tip of a syringe filled with liquid, the method comprising: The distance between the ejection point and the tip of the nozzle is set so that the correlation between the value corresponding to the area and the amount of liquid actually ejected is high, and the distance corresponding to the area of the liquid spread to the ejection point is set. Determined value, from the value, the discharge amount is estimated to be larger or smaller than the target discharge amount, and controlling the liquid discharging device so that the discharge amount is constant, A discharge amount control method for a liquid discharge device.