Source: http://www.google.com/patents/US7893368?dq=6480844
Timestamp: 2015-05-24 22:41:17
Document Index: 718894840

Matched Legal Cases: ['Application No. 2007', 'Application No. 2007', 'Application No. 2004', 'art 26', 'art 26', 'art 29', 'art 29', 'art 43', 'art 43', 'art 43', 'arts 47', 'arts 47', 'arts 47', 'art 43', 'arts 47', 'arts 47', 'art 43', 'art 43', 'art 48', 'art 48', 'art 43', 'art 48', 'art 48', 'art 43', 'art 43', 'arts 49', 'arts 49', 'art 50', 'art 50', 'arts 50', 'art 50', 'arts 50', 'arts 50', 'arts 26', 'art 26', 'arts 50', 'art 50', 'arts 26', 'art 50', 'art 50', 'art 50', 'art 50', 'art 26', 'art 50', 'art 50', 'art 26', 'art 50', 'art 50', 'art 26', 'art 50', 'art 26', 'art 50', 'art 50', 'art 26', 'art 26', 'art 50', 'art 50', 'art 50', 'art 50', 'art 50', 'art 50', 'art 26', 'art 26', 'art 50', 'art 29', 'art 50', 'art 43', 'art 43', 'art 47', 'art 48', 'art 43', 'art 47', 'art 48', 'art 50', 'art 50', 'arts 47', 'arts 47', 'arts 47', 'arts 47', 'arts 47', 'arts 47', 'arts 47', 'arts 47', 'arts 47', 'arts 47', 'arts 47', 'art 48', 'art 43', 'art 43', 'arts 47', 'art 48', 'art 43', 'art 43', 'arts 47', 'art 48', 'art 43', 'art 29', 'art 29', 'arts 47', 'art 48', 'art 43', 'arts 47', 'art 48', 'arts 47', 'art 48', 'art 90', 'art 47', 'art 90', 'arts 47', 'arts 47', 'arts 47', 'arts 47', 'art 90', 'art 90', 'art 90', 'art 90', 'art 90', 'arts 47', 'art 48', 'arts 47', 'art 48', 'arts 47', 'art 48', 'art 43']

Patent US7893368 - Weight measurement device, droplet discharge device, and weight measurement ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA weight measurement device is configured and arranged to measure the weight of a measurement object. The weight measurement device includes a container and a wind-guard cover. The container is configured and arranged to receive the measurement object therein. The wind-guard cover is configured and arranged...http://www.google.com/patents/US7893368?utm_source=gb-gplus-sharePatent US7893368 - Weight measurement device, droplet discharge device, and weight measurement methodAdvanced Patent SearchPublication numberUS7893368 B2Publication typeGrantApplication numberUS 12/142,407Publication dateFeb 22, 2011Filing dateJun 19, 2008Priority dateJul 3, 2007Fee statusPaidAlso published asCN101337459A, CN101337459B, CN101927601A, CN101927601B, US8816224, US20090008159, US20110100725Publication number12142407, 142407, US 7893368 B2, US 7893368B2, US-B2-7893368, US7893368 B2, US7893368B2InventorsTakatoshi Yamamoto, Kenji KojimaOriginal AssigneeSeiko Epson CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (19), Referenced by (4), Classifications (16), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetWeight measurement device, droplet discharge device, and weight measurement method
US 7893368 B2Abstract
A weight measurement device is configured and arranged to measure the weight of a measurement object. The weight measurement device includes a container and a wind-guard cover. The container is configured and arranged to receive the measurement object therein. The wind-guard cover is configured and arranged to selectively cover an upper space of the container. The wind-guard cover has a transverse air-blocking part configured and arranged to block an air flow flowing in a transverse direction with respect to the container. The container also is equipped with an air control device that injects temperature-adjusted air into a chamber that accommodates the container and the wind-guard cover.
1. A weight measurement system for measuring the weight of a measurement object, the weight measurement system comprising:
a container configured and arranged to receive the measurement object therein;
a wind-guard cover configured and arranged to selectively cover an upper space of the container; and
an air control device configured and arranged to distribute a temperature-adjusted air into a chamber that accommodates the container and the wind-guard cover,
the wind-guard cover having a transverse air-blocking part configured and arranged to block an air flow flowing in a transverse direction with respect to the container.
2. The weight measurement system according to claim 1, further comprising
a raising/lowering device configured and arranged to move at least one of the wind-guard cover and the container so that a relative position of the wind-guard cover with respect to the container is switched between a proximal position and a remote position.
3. The weight measurement system according to claim 2, further comprising
a control device configured to control an operation of the raising/lowering device and to measure the weight of the measurement object after the relative position of the wind-guard cover with respect to the container is set in the proximal position.
4. The weight measurement system according to claim 2, wherein
the raising/lowering device has an elastic member and an air cylinder, the elastic member being configured and arranged to urge the wind-guard cover and the container away from each other, the air cylinder being configured and arranged to urge the wind-guard cover and the container towards each other.
5. The weight measurement system according to claim 3, further comprising
a cover receiving part disposed in at least a part of a periphery around the container at a location that faces the wind-guard cover when the wind-guard cover is placed in the proximal position,
at least one of the wind-guard cover and the cover receiving part having an elastic part at a location where the wind-guard cover and the cover receiving part are adjacent to each other when the wind-guard cover is placed in the proximal position.
6. The weight measurement system according to claim 3, further comprising
a windbreak part configured and arranged to cover at least a part of the wind-guard cover.
7. The weight measurement system according to claim 3, further comprising
an additional container,
the wind-guard cover being configured and arranged to selectively cover an upper space of the additional container and the upper space of the container.
8. The weight measurement system according to claim 3, further comprising
an additional container, and
an additional wind-guard cover configured and arranged to selectively cover an upper space of the additional container.
9. The weight measurement system according to claim 3, further comprising
an additional wind-guard cover configured and arranged to selectively cover an upper space of the additional container and the upper space of the container so that at least the upper space of the container is covered by the wind-guard cover and the additional wind-guard cover.
10. The weight measurement system according to claim 3, further comprising
a movement device configured and arranged to move at least one of the wind-guard cover and the container relative to each other in a direction substantially parallel to a plane extending between the wind-guard cover and the container.
11. The weight measurement system according to claim 2, further comprising
a cover receiving part including a recess disposed in at least a part of a periphery around the container at a location that faces the wind-guard cover when the wind-guard cover is placed in the proximal position,
at least a part of the wind-guard cover is inserted into the recess when the wind-guard cover is placed in the proximal position.
12. A droplet discharge device comprising:
a droplet-discharge head configured and arranged to discharge a liquid material onto a workpiece mounted on a stage while the stage and the droplet-discharge head are moved relative to each other; and
a weight measurement device configured and arranged to measure the weight of the liquid material, the weight measurement device including
a container configured and arranged to receive the liquid material discharged from the droplet-discharge heads,
a wind-guard cover configured and arranged to selectively cover an upper space of the container, and
13. The droplet discharge device according to claim 12, wherein
the weight measurement device further includes a raising/lowering device configured and arranged to move at least one of the wind-guard cover and the container so that a relative position of the wind-guard cover with respect to the container is switched between a proximal position and a remote position.
14. The droplet discharge device according to claim 13, wherein
the weight measurement device further includes a control device configured to control an operation of the raising/lowering device and to measure the weight of the liquid material after the relative position of the wind-guard cover with respect to the container is set in the proximal position.
15. The droplet discharge device according to claim 14, wherein
16. The droplet discharge device according to claim 14, wherein
the weight measurement device further includes a cover receiving part disposed in at least a part of a periphery around the container at a location that faces the wind-guard cover when the wind-guard cover is placed in the proximal position, and
at least one of the wind-guard cover and the cover receiving part has an elastic part at a location where the wind-guard cover and the cover receiving part are adjacent to each other when the wind-guard cover is placed in the proximal position.
17. The droplet discharge device according to claim 14, wherein
the weight measurement device further includes a windbreak part configured and arranged to cover at least a part of the wind-guard cover.
18. The droplet discharge device according to claim 14, further comprising
an air control device configured and arranged to distribute a temperature-adjusted air into a chamber that accommodates the container and the wind-guard cover.
19. The droplet discharge device according to claim 14, wherein
the weight measurement device further includes an additional container, and
the wind-guard cover is configured and arranged to selectively cover an upper space of the additional container and the upper space of the container.
20. The droplet discharge device according to claim 14, wherein
the weight measurement device further includes an additional container and an additional wind-guard cover configured and arranged to selectively cover an upper space of the additional container.
21. The droplet discharge device according to claim 14, wherein
the weight measurement device further includes an additional container and an additional wind-guard cover configured and arranged to selectively cover an upper space of the additional container and the upper space of the container so that at least the upper space of the container is covered by the wind-guard cover and the additional wind-guard cover.
22. The droplet discharge device according to claim 14, further comprising
23. The droplet discharge device according to claim 13, further comprising
24. The droplet discharge device according to claim 22, wherein
the movement device is further configured and arranged to move the container to a location facing the droplet-discharge head and to a location facing the wind-guard cover.
25. The droplet discharge device according to claim 13, further comprising
a discharged-liquid receiver disposed adjacent to the container.
26. The droplet discharge device according to claim 25, wherein
the transverse air-blocking part is positioned to be adjacent to or in contact with a location that is not coated with the liquid material received in the discharged-liquid receiver when the relative position of the wind-guard cover with respect to the container is set in the proximal position.
27. A weight measurement method for measuring the weight of a measurement object placed in a container, the weight measurement method comprising:
distributing a temperature-adjusted air into a chamber that accommodates the container and the wind-guard cover;
placing the measurement object in the container;
covering the container with a wind-guard cover to prevent an air flow flowing in a vertical direction and a transverse direction with respect to the container from contacting the container;
measuring the weight of the measurement object; and
removing the wind-guard cover from the container so that a prescribed gap is formed between the wind-guard cover and the container.
28. The weight measurement method according to claim 27, wherein
the covering of the container includes moving the wind-guard cover and a cover receiving part disposed adjacent to the container to locations facing each other, and then moving the wind-guard cover and the cover receiving part towards each other. Description
This application claims priority to Japanese Patent Application No. 2007-174861 filed on Jul. 3, 2007. The entire disclosure of Japanese Patent Application No. 2007-174861 is hereby incorporated herein by reference.
The present invention relates to a weight measurement device, a droplet discharge device, and a weight measurement method. More particularly, the present invention relates to a device and method for conducting precise measurements without being affected by an air flow.
In conventional practice, droplet discharge devices for discharging droplets by using an inkjet system are known as devices for discharging droplets onto a workpiece. A droplet discharge device comprises a carriage on which an inkjet head (hereinafter referred to as droplet-discharge head) is mounted, and a table for carrying and moving a substrate or another workpiece. Droplets are discharged onto the workpiece while the droplet-discharge head and the workpiece are moved relative to each other, thus coating the workpiece.
Japanese Laid-Open Patent Application No. 2004-209429 discloses a method for precisely controlling the discharged amount in this type of droplet discharge device. According to this method, a droplet discharge device coats a workpiece while controlling the sprayed amount of functional liquid by adjusting the discharged amount following a measurement of the amount discharged by a droplet-discharge head provided with a weight measurement device. Since the amount discharged by the droplet-discharge head is susceptible to the effects of the ambient temperature, the temperature of the droplet discharge device is controlled by creating a flow of a gas (air) whose temperature is controlled by an air control device.
In the conventional methods as described above, an air flow is created by an air control device. The weight measurement device measures the weight of a container holding the measurement object while air is flowing. At this time, a problem is encountered in that contact between the air flow and the container causes the measurement of the measurement object to fluctuate and that the weight cannot be precisely measured.
Accordingly, one object of the present invention is to resolve at least some of the problems described above.
A weight measurement device according to a first aspect of the invention is arranged to measure the weight of a measurement object. The weight measurement device includes a container and a wind-guard cover. The container is configured and arranged to receive the measurement object therein. The wind-guard cover is configured and arranged to selectively cover an upper space of the container. The wind-guard cover has a transverse air-blocking part configured and arranged to block an air flow flowing in a transverse direction with respect to the container.
The weight measurement device comprises a wind-guard cover, and the wind-guard cover has a transverse air-blocking part. The wind-guard cover may prevent an air flow that moves in the direction of gravitational acceleration from coming into contact with the container. Furthermore, the transverse air-blocking part blocks the flow of gases, whereby the moving air flow is prevented from moving towards the side surfaces of the container and coming into contact with the container. Therefore, the weight measurements of the measurement object are prevented from being caused to fluctuate by the contact of a moving air flow with the container. As a result, the weight of the measurement object can be accurately measured.
The weight measurement device may further include a raising/lowering device configured and arranged to move at least one of the wind-guard cover and the container so that a relative position of the wind-guard cover with respect to the container is switched between a proximal position and a remote position.
In this weight measurement device, the raising/lowing device moves the wind-guard cover and the container away from each other. Therefore, since the container and wind-guard cover do not slide when the container and wind-guard cover are moved relative to each other, the container does not rub against the wind-guard cover and does not vibrate. As a result, it is possible to prevent the container from vibrating and the weight measurements of the measurement object from fluctuating. As a result, the weight of the measurement object can be accurately measured.
The weight measurement device according to the above-described aspect may further include a control device configured to control an operation of the raising/lowering device and to measure the weight of the measurement object after the relative position of the wind-guard cover with respect to the container is set in the proximal position.
In this weight measurement device, the control device measures the weight of the measurement object after the wind-guard cover has come in proximity to the container. Therefore, the measurement object is measured after a moving air flow is prevented from coming into contact with the container. It is therefore possible to prevent the container from being vibrated by the air flow, and the weight measurements of the measurement object from fluctuating. As a result, the weight of the measurement object can be accurately measured.
In the weight measurement device according to the above-described aspect, the raising/lowering device may have an elastic member and an air cylinder, the elastic member being configured and arranged to urge the wind-guard cover and the container away from each other, the air cylinder being configured and arranged to urge the wind-guard cover and the container towards each other.
In this weight measurement device, the air cylinder urges the wind-guard cover and the container towards each other. When the pressure of the gas supplied to the air cylinder decreases, the elastic member urges the wind-guard cover and the container away from each other. Therefore, the wind-guard cover and the container separate from each other when the pressure of the gas supplied to the air cylinder decreases. Therefore, the wind-guard cover and the container can be prevented from coming into contact with each other, and the wind-guard cover and container can be prevented from being damaged.
The weight measurement device according to the above-described aspect may further include a cover receiving part disposed in at least a part of a periphery around the container at a location that faces the wind-guard cover when the wind-guard cover is placed in the proximal position. At least one of the wind-guard cover and the cover receiving part may have an elastic part at a location where the wind-guard cover and the cover receiving part are adjacent to each other when the wind-guard cover is placed in the proximal position.
In this weight measurement device, an elastic part is disposed between the wind-guard cover and the cover receiving part. When the wind-guard cover comes in proximity to the cover receiving part, the wind-guard cover sometimes comes into contact with the cover receiving part. At this time, since the elastic part deforms, the cover receiving part is prevented from vibrating. The container is prevented from vibrating due to transmission of the vibration of the cover receiving part to the container, and the weight measurements of the measurement object are prevented from fluctuating. As a result, the weight of the measurement object can be accurately measured.
The weight measurement device according to the above-described aspect may further include a windbreak part configured and arranged to cover at least a part of the wind-guard cover.
In this weight measurement device, an air flow that moves towards the wind-guard cover comes into contact with the windbreak part, whereby the speed of the air flow is reduced. Therefore, the speed of the air flow that comes into contact with the wind-guard cover can be reduced in comparison with a case in which there is no windbreak part. Vibration of the container can be inhibited because the air flow that comes into contact with the wind-guard cover is further slowed. Therefore, since the container is prevented from vibrating and the weight measurements of the measurement object are prevented from fluctuating, the weight of the measurement object can be accurately measured.
The weight measurement device according to the above-described aspect may further include an air control device configured and arranged to distribute a temperature-adjusted air into a chamber that accommodates the container and the wind-guard cover.
In this weight measurement device, since a temperature-adjusted air flows to the periphery of the weight measurement device, the temperature of the weight measurement device can be managed. Therefore, since the weight measurement device measures the weight of the measurement object in a state not easily affected by temperature, the weight of the measurement object can be accurately measured.
The weight measurement device according to the above-described aspect may further include an additional container. The wind-guard cover may be configured and arranged to selectively cover an upper space of the additional container and the upper space of the container.
In this weight measurement device, as a result of covering a plurality of containers with one wind-guard cover, the containers can be covered by a smaller number of wind-guard covers than the number of containers. As a result, a simple configuration can be achieved.
The weight measurement device according to the above-described aspect may further include an additional container, and an additional wind-guard cover configured and arranged to selectively cover an upper space of the additional container.
In this weight measurement device, one wind-guard cover covers one container, whereby each wind-guard cover can be formed to a shape corresponding with the shape of a container. The wind-guard covers can then reliably cover the containers. As a result, the weight measurement device can perform measurements without being affected by a moving air flow, and the weight of the measurement object can therefore be accurately measured.
The weight measurement device according to the above-described aspect may further include an additional container, and an additional wind-guard cover configured and arranged to selectively cover an upper space of the additional container and the upper space of the container so that at least the upper space of the container is covered by the wind-guard cover and the additional wind-guard cover.
In this weight measurement device, one container is covered by a plurality of air-guard covers. Therefore, a moving air flow can be prevented from striking the containers, as opposed to a case in which one container is covered by one wind-guard cover. As a result, the weight measurement device can perform measurements without being affected by the moving air flow, and the weight of the measurement object can therefore be accurately measured.
The weight measurement device according to the above-described aspect may further include a movement device configured and arranged to move at least one of the wind-guard cover and the container relative to each other in a direction substantially parallel to a plane extending between the wind-guard cover and the container.
In this weight measurement device, since the measurement object can be disposed in the containers after the wind-guard covers are moved away from the upper spaces of the containers, the measurement object can be more readily disposed in the containers. Therefore, the weight of the measurement object can be measured more easily.
The weight measurement device according to the above-described aspect may further include a cover receiving part including a recess disposed in at least a part of a periphery around the container at a location that faces the wind-guard cover when the wind-guard cover is placed in the proximal position. At least a part of the wind-guard cover may be inserted into the recess when the wind-guard cover is placed in the proximal position.
In this weight measurement device, since part of the wind-guard cover is inserted into the recess formed in the cover receiving part, an air flow that moves toward the wind-guard cover does not readily pass between the wind-guard cover and the cover receiving part. Therefore, since the air flow does not readily come into contact with the containers and the containers do not readily vibrate, it is possible to prevent the moving air flow from coming into contact with the containers, and the weight measurements of the measurement object from fluctuating. As a result, the weight of the measurement object can be accurately measured.
A droplet discharge device according to another aspect of the invention is a droplet discharge device for discharging a liquid material from a droplet-discharge head onto a workpiece while moving the workpiece and the droplet-discharge head relative to each other. The droplet discharge device includes a weight measurement device configured and arranged to measure the weight of the liquid material. The weight measurement device includes a container and a wind-guard cover. The container is configured and arranged to receive the liquid material discharged from the droplet-discharge heads. The wind-guard cover is configured and arranged to selectively cover an upper space of the container. The wind-guard cover having a transverse air-blocking part configured and arranged to block an air flow flowing in a transverse direction with respect to the container.
In this droplet discharge device, the weight measurement device includes a wind-guard cover, and the wind-guard cover has a transverse air-blocking part. The wind-guard cover prevents the air flow that moves in the direction of gravitational acceleration from coming into contact with the container. Furthermore, the transverse air-blocking part blocks the flow of gases, whereby an air flow is prevented from moving away from the side surfaces of the container and coming into contact with the container. Therefore, the weight measurements of the measurement object are prevented from being caused to fluctuate by the contact of a moving air flow with the container. As a result, the weight of the measurement object can be accurately measured, whereby the amount discharged can be discharged and sprayed with precision.
In the droplet discharge device according to the above-described aspect, the weight measurement device may further include a raising/lowering device configured and arranged to move at least one of the wind-guard cover and the container so that a relative position of the wind-guard cover with respect to the container is switched between a proximal position and a remote position.
In this droplet discharge device, the raising/lowing device moves the wind-guard cover and the container away from each other. Therefore, since the container and wind-guard cover do not come into contact with each other, the container does not come into contact with the wind-guard cover and does not vibrate. As a result, it is possible to prevent the container from vibrating and the weight measurements of the measurement object from fluctuating. As a result, the weight of the measurement object can be accurately measured.
In the droplet discharge device according to the above-described aspect, the weight measurement device may further include a control device configured to control an operation of the raising/lowering device and to measure the weight of the liquid material after the relative position of the wind-guard cover with respect to the container is set in the proximal position.
In this droplet discharge device, the control device measures the weight of the measurement object after the wind-guard cover has come in proximity to the container. Therefore, since the measurement object is measured after a moving air flow is prevented from coming into contact with the container, it is possible to prevent the container from vibrating and the weight measurements of the measurement object from fluctuating. As a result, the weight of the measurement object can be accurately measured.
In the droplet discharge device according to the above-described aspect, the raising/lowering device may have an elastic member and an air cylinder, the elastic member being configured and arranged to urge the wind-guard cover and the container away from each other, the air cylinder being configured and arranged to urge the wind-guard cover and the container towards each other.
In this droplet discharge device, the air cylinder urges the wind-guard cover and the container towards each other. When the pressure of the gas supplied to the air cylinder decreases, the elastic member urges the wind-guard cover and the container away from each other. Therefore, the wind-guard cover and the container separate from each other when the pressure of the gas supplied to the air cylinder decreases. Therefore, the wind-guard cover and container can be prevented from coming into contact and being damaged.
In the droplet discharge device according to the above-described aspect, the weight measurement device may further include a cover receiving part disposed in at least a part of a periphery around the container at a location that faces the wind-guard cover when the wind-guard cover is placed in the proximal position. At least one of the wind-guard cover and the cover receiving part may have an elastic part at a location where the wind-guard cover and the cover receiving part are adjacent to each other when the wind-guard cover is placed in the proximal position.
In this droplet discharge device, an elastic part is disposed between the wind-guard cover and the cover receiving part. Thereby, when the wind-guard cover comes in proximity to the cover receiving part, the wind-guard cover sometimes comes into contact with the cover receiving part. At this time, since the elastic part deforms, the cover receiving part is prevented from vibrating. The container is prevented from vibrating due to transmission of the vibration of the cover receiving part to the container, and the weight measurements of the measurement object are prevented from fluctuating. As a result, the weight of the measurement object can be accurately measured.
In the droplet discharge device according to the above-described aspect, the weight measurement device may further include a windbreak part configured and arranged to cover at least a part of the wind-guard cover.
In this droplet discharge device, an air flow that moves towards the wind-guard cover comes into contact with the windbreak part, whereby the speed of the air flow is reduced. Therefore, the speed of the air flow that comes into contact with the wind-guard cover can be reduced in comparison with a case in which there is no windbreak part. Vibration of the container can be inhibited because the air flow that comes into contact with the wind-guard cover is further slowed. Therefore, since the container is prevented from vibrating and the weight measurements of the measurement object are prevented from fluctuating, the weight of the measurement object can be accurately measured.
The droplet discharge device according to the above-described aspect may further include an air control device configured and arranged to distribute a temperature-adjusted air into a chamber that accommodates the container and the wind-guard cover.
In this droplet discharge device, since a temperature-adjusted gas flows to the periphery of the weight measurement device, the temperature of the weight measurement device can be managed. Therefore, since the weight measurement device measures the weight of the measurement object in a state not easily affected by temperature, the weight of the measurement object can be accurately measured.
In the droplet discharge device according to the above-described aspect, the weight measurement device may further include an additional container, and the wind-guard cover may be configured and arranged to selectively cover an upper space of the additional container and the upper space of the container.
In this droplet discharge device, covering a plurality of containers with one wind-guard cover allows the containers to be covered by a smaller number of wind-guard covers than the number of containers. As a result, a simple configuration can be achieved.
In the droplet discharge device according to the above-described aspect, the weight measurement device may further include an additional container and an additional wind-guard cover configured and arranged to selectively cover an upper space of the additional container.
According to this droplet discharge device, one wind-guard cover covers one container, whereby each wind-guard cover can be formed to a shape corresponding with the shape of the container. The wind-guard covers can then reliably cover the containers. As a result, the weight measurement device can perform measurements without being affected by a moving air flow, and the weight of the measurement object can therefore be accurately measured.
In the droplet discharge device according to the above-described aspect, the weight measurement device may further include an additional container and an additional wind-guard cover configured and arranged to selectively cover an upper space of the additional container and the upper space of the container so that at least the upper space of the container is covered by the wind-guard cover and the additional wind-guard cover.
According to this droplet discharge device, one container is covered by a plurality of wind-guard covers. Therefore, a moving air flow can be prevented from coming into contact with the containers, as opposed to a case in which one container is covered by one wind-guard cover. As a result, the weight measurement device can perform measurements without being affected by the moving air flow, and the weight of the measurement object can therefore be accurately measured.
The droplet discharge device according to the above-described aspect may further include a movement device configured and arranged to move at least one of the wind-guard cover and the container relative to each other in a direction substantially parallel to a plane extending between the wind-guard cover and the container.
According to this droplet discharge device, since the wind-guard covers can be moved away from the upper spaces of the containers, the measurement object can be more readily disposed in the containers. Therefore, the weight of the measurement object can be measured more easily.
The droplet discharge device according to the above-described aspect may further include a cover receiving part including a recess disposed in at least a part of a periphery around the container at a location that faces the wind-guard cover when the wind-guard cover is placed in the proximal position. At least a part of the wind-guard cover may be inserted into the recess when the wind-guard cover is placed in the proximal position.
In this droplet discharge device, since part of the wind-guard cover is inserted into the recess formed in the cover receiving part, an air flow that moves toward the wind-guard cover does not readily pass between the wind-guard cover and the cover receiving part. Therefore, since the air flow does not readily come into contact with the containers and the containers do not readily vibrate, it is possible to prevent the moving air flow from coming into contact with the containers, and the weight measurements of the measurement object from fluctuating. As a result, the weight of the measurement object can be accurately measured.
In the droplet discharge device according to the above-described aspect, the movement device may be further configured and arranged to move the container to a location facing the droplet-discharge head and to a location facing the wind-guard cover.
In this droplet discharge device, after the liquid material is discharged onto the containers, the weight of the discharged liquid material can be measured in a simple manner.
The droplet discharge device according to the above-described aspect may further include a discharged-liquid receiver disposed adjacent to the container.
In this droplet discharge device, droplets are discharged from standby droplet-discharge heads into the discharged-liquid receiver. The liquid material in the nozzles of the droplet-discharge heads can be prevented from evaporating, and the liquid material can be prevented from increasing in viscosity. Furthermore, since the containers and the discharge receiver are located in proximity to each other, the droplet-discharge heads can be moved to a location opposite the containers and measurement can be initiated before the liquid material increases in viscosity.
In the droplet discharge device according to the above-described aspect, the transverse air-blocking part is positioned to be adjacent to or in contact with a location that is not coated with the liquid material received in the discharged-liquid receiver when the relative position of the wind-guard cover with respect to the container is set in the proximal position.
In this droplet discharge device, the transverse air-blocking part comes into proximity of, or into contact with, a location where the liquid material does not readily adhere, whereby adherence of the liquid material to the transverse air-blocking part can be inhibited. Therefore, the liquid material can be prevented from corroding the transverse air-blocking part.
A weight measurement method according to another aspect of the invention is a method for measuring the weight of a measurement object placed in a container. The weight measurement method includes: placing the measurement object in the container; covering the container with a wind-guard cover to prevent an air flow flowing in a vertical direction and a transverse direction with respect to the container from contacting the container; measuring the weight of the measurement object; and removing the wind-guard cover from the container so that a prescribed gap is formed between the wind-guard cover and the container.
According to this weight measurement method, during the cover-setting step, an air flow that moves toward the container from the top and side surfaces is covered by the wind-guard cover. Therefore, the weight measurements of the measurement object can be prevented from being caused to fluctuate by the contact of a moving air flow with the container. As a result, the weight of the measurement object can be accurately measured.
In the weight measurement method according to the above-described aspect, the covering of the container may include moving the wind-guard cover and a cover receiving part disposed adjacent to the container to locations facing each other, and then moving the wind-guard cover and the cover receiving part towards each other.
According to this weight measurement method, the wind-guard cover and the cover receiving part can be brought into proximity of each other without rubbing together. Therefore, the cover receiving part does not vibrate due to friction, and vibration from the cover receiving part is not transmitted to the container. As a result, the weight of the measurement object can be accurately measured without vibrating the container.
FIG. 1 is a schematic perspective view showing the configuration of a droplet discharge device having a weight measurement device according to the first embodiment;
FIG. 2A is a schematic plan view showing a head unit of the droplet discharge device according to the first embodiment;
FIG. 2B is a partial schematic cross-sectional view showing the structure of a droplet-discharge head of the head unit according to the first embodiment;
FIG. 3 is a partial schematic cross-sectional view showing the structure of the weight measurement device when wind-guard covers are placed in a proximal position with respect to containers according to the first embodiment;
FIG. 4 is a partial schematic cross-sectional view showing the structure of the weight measurement device when the wind-guard covers are placed in a remote position with respect to the containers according to the first embodiment;
FIG. 5 is a schematic plan view showing a maintenance stage according to the first embodiment;
FIG. 6 is an electric control block diagram of the droplet discharge device according to the first embodiment;
FIG. 7 is a flowchart showing steps for measuring the weight of the functional liquid discharged by the droplet-discharge heads according to the first embodiment;
FIG. 8 is a series of diagrams (a) to (c) for describing the method for measuring the weight of the functional liquid discharged by the droplet-discharge heads according to the first embodiment;
FIG. 9 is a series of diagrams (a) to (c) for describing the method for measuring the weight of the functional liquid discharged by the droplet-discharge heads according to the first embodiment;
FIG. 10 is a pair of diagrammatic graphs (a) and (b) for describing the effects of the transverse air-blocking parts according to the first embodiment;
FIG. 11 is a schematic perspective view showing the configuration of a droplet discharge device according to a second embodiment; and
FIG. 12 is a pair of diagrams (a) and (b) showing partial schematic cross-sectional views of the structure of the wind-guard covers according to a third embodiment.
The following is a description, made with reference to the drawings, of an embodiment in which the weight of a functional liquid is measured without being affected by air flow. The members in the drawings are each displayed in a different scale so as to be shown in a size recognizable in the drawings.
In the present embodiment, a characteristic example of a droplet discharge device, and a case of measuring a functional liquid discharged using this droplet discharge device, are described with reference to FIGS. 1 through 10.
First, a droplet discharge device 1 for discharging droplets to coat a workpiece will be described according to FIGS. 1 through 6. Various devices can be used for the droplet discharge device, but a conventional inkjet device is preferred. The inkjet device is configured and arranged to discharge miniscule droplets and is therefore suitable for fine processing.
FIG. 1 is a schematic perspective view showing the configuration of the droplet discharge device. The functional liquid is discharged and sprayed by the droplet discharge device 1. The droplet discharge device 1 has a base 2 formed in the shape of a rectangular parallelepiped, as shown in FIG. 1. In the present embodiment, the longitudinal direction of the base 2 is the Y direction, and the direction orthogonal to the Y direction is the X direction.
A pair of convex guide rails 3 extending in the Y direction is provided across the entire width in the Y direction of a top surface 2 a of the base 2. On the top side of the base 2 is mounted a stage 4 as a table having a translation mechanism (not shown) that corresponds to the guide rails 3. The translation mechanism of the stage 4 is a screw-based translation mechanism having, e.g., screw shafts (drive shafts) extending in the Y direction along the guide rails 3, and ball nuts that are threaded on the screw shafts. The drive shafts are connected to a Y-axis motor (not shown) that receives specific pulse signals and rotates forward and in reverse in step units. When a drive signal corresponding to a specific number of steps is inputted to the Y-axis motor, the Y-axis motor rotates forward or in reverse, and the stage 4 moves forward or backward (scans in the Y direction) at a specific speed along the Y direction in an amount equivalent to the number of steps.
Furthermore, a main scanning position detection device 5 is disposed parallel to the guide rails 3 on the top surface 2 a of the base 2, whereby the position of the stage 4 can be measured.
A mounting surface 6 is formed on the top surface of the stage 4, and a substrate suction chucking mechanism (not shown) is provided on the mounting surface 6. When a substrate 7 as a workpiece is mounted on the mounting surface 6, the substrate 7 is positioned and fixed in place at a specific position on the mounting surface 6 by the substrate chucking mechanism.
A plurality of support stands 8 a and 8 b is provided upright symmetrically on either side of the base 2 as seen in the X-direction, and a guide member 9 extending in the X direction is provided between the support stands 8 a and 8 b. The guide member 9 is formed extending in the direction opposite the X direction, and a plurality of support stands 8 c are provided upright at an end of the guide member 9. The support stands 8 a through 8 c are designed to support the guide member 9.
A pair of convex guide rails 10 extending in the X direction is provided across the entire width in the X direction of the top side of the guide member 9. A carriage 11 moveably disposed along the guide rails 10 is configured from eight carriages, and the carriages 11 have a translation mechanism which enables the carriages 11 to move independently. The translation mechanism is a screw-based movement mechanism having, e.g., screw shafts (drive shafts) extending in the X direction along the guide rails 10, and ball nuts that are threaded on the screw shafts. The drive shafts are connected to an X-axis motor (not shown) that receives specific pulse signals and rotates forward and in reverse in step units. When a drive signal corresponding to a specific number of steps is inputted to the X-axis motor, the X-axis motor rotates forward or in reverse, and the carriage 11 moves forward or backward (scan in the X direction) along the X direction in an amount equivalent to the number of steps. A sub-scanning position detection device 12 is disposed on the side surface of the guide member 9, and this device allows the positions of the carriages 11 to be measured.
A head unit 13 and a raising/lowering device 14 for raising and lowering the head unit 13 are disposed on the underside (the side nearer the stage 4) of the carriage 11, and a convex droplet-discharge head 15 is provided on the bottom surface of the head unit 13. A storage tank 16 is provided on the top side of the carriage 11, and the storage tank 16 and droplet-discharge head 15 are connected by a tube (not shown). The tube is configured and arranged to supply the functional liquid stored in the storage tank 16 to the droplet-discharge head 15.
A maintenance stand 17 is disposed between the support stands 8 a and the support stands 8 c, and a wiping unit 18 and capping unit 19 are disposed on the top surface 17 a of the maintenance stand 17. The movement of the carriage 11 allows the droplet-discharge head 15 to move to a location opposite the wiping unit 18 or the capping unit 19.
The wiping unit 18 is a device for wiping a nozzle plate provided with nozzles in the droplet-discharge head 15. The nozzle plate is a member disposed on the droplet-discharge head 15 on the side facing the substrate 7. When droplets adhere to the nozzle plate, there is contact between the substrate 7 and the adhered droplets, and the droplets are deposited at unintended locations on the substrate 7.
Furthermore, when droplets adhere to the peripheries of the nozzles, there is contact between the discharged droplets and the adhered droplets, and the trajectories of the ejected droplets are sometimes curved. At this time, the sprayed locations are not the locations that were intended to be sprayed. By wiping the nozzle plate, the wiping unit 18 prevents droplets from adhering to unintended locations on the substrate 7.
The capping unit 19 is a device having the functions of fitting a cap over the droplet-discharge head 15 and absorbing the functional liquid in the droplet-discharge head 15. The droplets discharged from the droplet-discharge head 15 are sometimes volatile, and when the functional liquid solvent inside the droplet-discharge head 15 vaporizes through the nozzles, the viscosity of the functional liquid changes, and the nozzles are sometimes clogged. By fitting a cap over the droplet-discharge head 15, the capping unit 19 prevents the nozzles from clogging.
Furthermore, when solid matter is admixed to the droplet-discharge head 15 and droplets cannot be discharged, the functional liquid and solid matter inside the droplet-discharge head 15 are absorbed and removed. The problem of nozzle clogging is thus resolved.
A maintenance stage 22 as a movement device is disposed on the top side of the base 2 and on one side (the right side in the drawing) of the stage 4; and a first flushing unit 23 (discharged-liquid receiver), a second flushing unit 24 (discharged-liquid receiver), and a weight measurement device 25 are disposed on the top surface 22 a of the maintenance stage 22.
The maintenance stage 22 is positioned over the guide rails 3 and has a translation mechanism similar to that of the stage 4. The position of the maintenance stage 22 is detected using the main scanning position detection device 5, and the maintenance stage 22 is moved by the translation mechanism, whereby the maintenance stage 22 can be moved to and stopped at a specific position. The maintenance stage 22 then moves along the guide rails 3, whereby the first flushing unit 23, the second flushing unit 24, and the weight measurement device 25 can be disposed at a location opposite the droplet-discharge head 15.
The first flushing unit 23 and the second flushing unit 24 are devices that receive the droplets discharged from the droplet-discharge head 15 when the flow channels in the droplet-discharge head 15 are cleaned. When the functional liquid in the droplet-discharge head 15 vaporizes, the functional liquid becomes more viscous and therefore difficult to discharge. In this case, droplets are discharged from the droplet-discharge head 15 to clean the droplet-discharge head 15 in order to remove the more viscous functional liquid from the droplet-discharge head 15. The function of receiving these droplets is performed by the first flushing unit 23 and the second flushing unit 24.
A plurality of electronic scales 44 (FIG. 3) (sixteen in this example) is disposed on the weight measurement device 25, and a catch pan 45 (FIG. 3) is disposed on each electronic scale 44. One row of electronic scales 44 is disposed in alignment in the X direction. Droplets are discharged from the droplet-discharge head 15 onto the catch pans 45, and the electronic scales 44 measure the weight of the droplets. The catch pans 45 have a sponge-form absorptive material and are designed to prevent the discharged droplets from splashing out of the catch pans 45. The electronic scales 44 measure the weight of the catch pans 45 before and after the droplet-discharge head 15 discharges droplets. The weight of the discharged droplets can be measured by calculating the difference in the weight of the catch pans 45 before and after discharge.
The first flushing unit 23 and the second flushing unit 24 are disposed on the sides of the weight measurement device 25. While part of the droplet-discharge head 15 is discharging onto the catch pans 45, the rest of the droplet-discharge head 15 can be positioned at a location opposite the first flushing unit 23 or the second flushing unit 24, where droplets are discharged.
A gate-shaped support stand 26 is provided upright so as to span from the two X direction sides of the base 2 to the top side at a location near the maintenance stage 22 of the base 2. A wind-guard cover 27 is disposed on the underside of a substantially horizontal bridge part 26 a in the support stand 26, and a wind-guard cover drive device 28 as a raising/lowering device is disposed on the top side of the bridge part 26 a. The wind-guard cover drive device 28 is configured and arranged to selectively raise/lower (elevate) the wind-guard cover 27 so that a relative position of the wind-guard cover 27 with respect to the catch pans 45 is switched between a proximal position (e.g., FIG. 3) and a remote position (e.g., FIG. 4). A windbreak part 29 is disposed on the top surface of the wind-guard cover drive device 28.
The droplet discharge device 1 has a plurality of support pillars 30 disposed at the four corners, respectively, and an air control device 31 (e.g., air conditioning device) disposed at the top (the top side in the diagram). The air control device 31 has a fan, a filter, a cooling/heating device, a humidity adjustment device, and other conventional components. The fan (air-blowing device) takes in ambient air and passes the air through the filter, whereby dust and debris are removed from the air, and purified air is supplied.
The cooling/heating device is a device for controlling the temperature of the supplied air so as to maintain the ambient temperature of the droplet discharge device 1 within a specific temperature range. The humidity adjustment device is a device for dehumidifying or humidifying the air to control the humidity of the supplied air so as to maintain the ambient humidity of the droplet discharge device 1 within a specific humidity range.
A sheet 32 is disposed between the four support pillars 30 and is designed to block the flow of air. Air supplied from the air control device 31 flows from the air control device 31 toward the floor 33 (in the direction opposite the Z direction in the drawing), and dust or debris in the space enclosed in the sheet 32 flows toward the floor 33. Dust or debris thereby does not readily adhere to the substrate 7.
Furthermore, the sheet 32 forms a chamber 34 and limits the flow of air between the interior and exterior of the chamber 34, thereby making it less likely that the temperature and humidity in the chamber 34 will be affected by the exterior of the chamber 34. The air control device 31 readily controls the temperature and humidity of the chamber 34.
Some of the air flow created the air control device 31 flows toward the weight measurement device 25. The air flow blowing toward the weight measurement device 25 strikes the windbreak part 29 and slows down. Furthermore, placement of the wind-guard cover 27 on the weight measurement device 25 makes it more difficult for the air flow to strike the weight measurement device 25.
FIG. 2A is a schematic plan view showing the head unit. On a single head unit 13, three droplet-discharge heads 15 are aligned in one row and are formed in an arrangement diagonal to the Y direction, and two of these rows are arranged as shown in FIG. 2A. A nozzle plate 35 is disposed on the surface of each droplet-discharge head 15, and a plurality of nozzles 36 is formed on each nozzle plate 35. The number of nozzles 36 can be set in accordance with the discharge pattern and the size of the substrate 7. In the present embodiment, e.g., two rows of nozzles 36 are formed on one nozzle plate 35, with fifteen nozzles 36 arranged in each row.
FIG. 2B is a partial schematic cross-sectional view showing the structure of a droplet-discharge head. A droplet-discharge head 15 has a nozzle plate 35, and nozzles 36 are formed on the nozzle plate 35, as shown in FIG. 2B. A plurality of cavities 37 for communicating with the nozzles 36 is formed in the top side of the nozzle plate 35 at positions corresponding with the nozzles 36. Functional liquid 38 as a measured substance, as well as a liquid material held in the storage tank 16, is supplied to the cavities 37 in the droplet-discharge head 15.
On the top side of the cavities 37 are provided a vibrating plate 39 that vibrates vertically (in the Z direction) to enlarge and reduce the internal capacity of the cavities 37, and piezoelectric elements 40 that lengthen and contract vertically to vibrate the vibrating plate 39. The piezoelectric elements 40 lengthen and contract vertically to apply pressure to and vibrate the vibrating plate 39, and the vibrating plate 39 enlarges and reduces the internal capacity of the cavities 37 to apply pressure to the cavities 37. The internal pressure of the cavities 37 thereby fluctuates, and the functional liquid 38 supplied to the cavities 37 is discharged through the nozzles 36.
When the droplet-discharge head 15 receives a nozzle drive signal for controllably driving the piezoelectric elements 40, the piezoelectric elements 40 extend and the vibrating plate 39 reduces the internal capacity of the cavities 37. As a result, an amount of functional liquid 38 proportionate to the reduced capacity is discharged as droplets 41 from the nozzles 36 of the droplet-discharge head 15.
FIGS. 3 and 4 are partial schematic cross-sectional views showing the structure of the weight measurement device. FIG. 3 shows a state in which the wind-guard cover 27 is placed in the proximal position to cover the catch pans 45 of the weight measurement device 25, and FIG. 4 shows a state in which the wind-guard cover 27 is separated from the catch pans 45 in the remote position. The weight measurement device 25 has a substantially rectangular box-shaped support part 43 disposed on top of the maintenance stage 22, as shown in FIG. 3. The electronic scales 44 are disposed inside the support part 43, and the catch pans 45 as containers are disposed on the top sides of the electronic scales 44. The catch pans 45 are substantially rectangular box-shaped containers composed of side surfaces and bottom surfaces, and absorptive elements 46 are disposed on the top surfaces of the catch pans 45. The electronic scales 44 are configured and arranged to measure the weight of functional liquid 38, which is a combination of functional liquid 38 in the catch pans 45 and functional liquid 38 absorbed in the absorptive elements 46.
Holes are formed in the locations where the catch pans 45 are disposed in the top surface 43 a, which serves as a cover receiving part for the support part 43. The functional liquid 38 can therefore enter into the catch pans 45 through the absorptive elements 46. Individual wind-guard covers 47 are disposed at locations opposite the catch pans 45 on the top sides of the catch pans 45. A plurality of transverse air-blocking parts 47 a is formed on the peripheries of the individual wind-guard covers 47. The transverse air-blocking parts 47 a are configured and arranged to block the flow of air in the X and Y directions. A plurality of end parts 47 b as elastic parts facing the support part 43 is formed from elastic members in the transverse air-blocking parts 47 a. The material for the elastic members can be an elastic and durable material, and silicone rubber, for example, is used in the present embodiment. Therefore, when the end parts 47 b come into contact with the top surface 43 a of the support part 43, the vibration is not readily transmitted to the support part 43 even in cases in which the air flow strikes and vibrates the wind-guard covers 47.
Since an individual wind-guard cover 47 is disposed over each catch pan 45, sixteen individual wind-guard covers 47 are provided, similar to the electronic scales 44. An overall wind-guard cover 48 is disposed over the top sides of the individual wind-guard covers 47, and the overall wind-guard cover 48 is disposed so as to cover the sixteen individual wind-guard covers 47 and the catch pans 45. The overall wind-guard cover 48 has a transverse air-blocking part 48 a formed on the periphery, similar to the individual wind-guard covers 47. An end part 48 b as an elastic part facing the support part 43 is formed from an elastic member in the transverse air-blocking part 48 a. Therefore, when the end part 48 b comes into contact with the top surface 43 a of the support part 43, the vibration is not readily transmitted to the support part 43 even in cases in which the air flow strikes and vibrates the overall wind-guard cover 48.
The individual wind-guard covers 47 and the overall wind-guard cover 48 are connected by support parts 49. The individual wind-guard covers 47 and the overall wind-guard cover 48 are designed to move in conjunction with each other. Therefore, the overall wind-guard cover 48 is designed to cover all of the catch pans 45 when the individual wind-guard covers 47 cover the catch pans 45. The support parts 49 are formed from rubber or another elastic material. The vibration is not readily transmitted to the individual wind-guard covers 47 even in cases in which the air flow comes into contact with and vibrates the overall wind-guard cover 48. Therefore, the air in the spaces covered by the individual wind-guard covers 47 does not readily vibrate.
A substantially gate-shaped support part 50 is disposed on the top surface of the overall wind-guard cover 48. The support part 50 is configured from two rod-shaped sliding parts 50 a extending in the Z direction, and a bridge part 50 b formed so as to span the distance between the sliding parts 50 a. The sliding parts 50 a pass through the centers of two bearing parts 26 b formed in the bridge part 26 a of the support stand 26. The sliding parts 50 a of the support part 50 slide with the bearing parts 26 b, allowing the support part 50 to move in the Z direction.
Two air cylinders 51 are disposed on the bridge part 50 b of the support part 50. The air cylinders 51 each have a movable shaft 51 a, and the movable shafts 51 a pass through holes 50 c formed in the support part 50. The distal ends of the movable shafts 51 a are arranged to be connected to the bridge part 26 a of the support stand 26. Tubes (not shown) are connected to the air cylinders 51. When compressed air is supplied through the tubes, the movable shafts 51 a contract and the bridge part 50 b of the support part 50 comes into proximity of the bridge part 26 a of the support stand 26. Coil springs 52 as elastic members are disposed near the air cylinders 51 and between the bridge part 50 b of the support part 50 and the bridge part 26 a of the support stand 26, and the coil springs 52 urge the bridge part 50 b and the bridge part 26 a away from each other. Since the coil springs 52 extend when the compressed air supplied to the air cylinders 51 is discharged, the bridge part 50 b of the support part 50 and the bridge part 26 a of the support stand 26 separate from each other.
A proximity sensor 53 is disposed on the top side of the bridge part 26 a of the support stand 26 at a location that faces the bridge part 50 b of the support part 50. The proximity sensor 53 senses the distance between the proximity sensor 53 and the bridge part 50 b of the support part 50. The proximity sensor 53 is configured and arranged to detect whether the bridge part 50 b of the support part 50 and the bridge part 26 a of the support stand 26 are in proximity of each other or are separated from each other. The wind-guard cover drive device 28 is configured from the air cylinders 51, the coil springs 52, the proximity sensor 53, and other components. A cover 54 is disposed on the top side of the bridge part 26 a of the support stand 26 so as to cover the support part 50 and the air cylinders 51. The windbreak part 29 is disposed on the top surface of the cover 54.
When the compressed air supplied to the air cylinders 51 is discharged, the coil springs 52 extend, as shown in FIG. 4. Since the support part 50 then moves upward, the overall wind-guard cover 48 and the individual wind-guard covers 47 rise. The overall wind-guard cover 48 and the individual wind-guard covers 47 move away from the support part 43, and the maintenance stage 22 can therefore move along the guide rails 3.
FIG. 5 is a schematic plan view showing the maintenance stage. The catch pans 45 are disposed in alignment in the middle of the support part 43, as shown in FIG. 5. The first flushing unit 23 and the second flushing unit 24 are disposed on both sides of the catch pans 45 in the Y direction of the catch pans 45. The individual wind-guard covers 47 and the overall wind-guard cover 48 are depicted in the drawing by the double-dashed lines. The individual wind-guard covers 47 and the overall wind-guard cover 48 are disposed so as to cover the catch pans 45. The individual wind-guard covers 47 and the overall wind-guard cover 48 are also disposed at locations where the covers are not in contact with the catch pans 45, the first flushing unit 23, or the second flushing unit 24. Therefore, since the functional liquid 38 does not readily adhere to the individual wind-guard covers 47 and the overall wind-guard cover 48, the individual wind-guard covers 47 and the overall wind-guard cover 48 do not readily corrode even when the functional liquid 38 is a corrosive liquid.
FIG. 6 is an electric control block diagram of the droplet discharge device. In FIG. 6, the droplet discharge device 1 has a CPU (central processing unit) 58 as a processor for performing various computations, and memory 59 for storing various types of information.
A main scanning drive device 60, the main scanning position detection device 5, a sub-scanning drive device 61, the sub-scanning position detection device 12, and a head drive circuit 62 are connected to the CPU 58 via an input/output interface 63 and a data bus 64. Furthermore, an input device 65, a display device 66, the wiping unit 18, the capping unit 19, the weight measurement device 25, the first flushing unit 23, and the second flushing unit 24 are also connected to the CPU 58 via the input/output interface 63 and the data bus 64. Similarly, the wind-guard cover drive device 28 for driving the wind-guard cover 27, a maintenance stage drive device 67 for driving the maintenance stage 22, and the main scanning position detection device 5 for detecting the position of the maintenance stage 22 are also connected to the CPU 58 via the input/output interface 63 and the data bus 64. Thus, the CPU 58 preferably constitutes a control device configured to control an operation of the wind-guard cover drive device 28 and to control the weight measurement device 25 to measure the weight of the droplets.
The main scanning drive device 60 is a device for controlling the movement of the stage 4, and the sub-scanning drive device 61 is a device for controlling the movement of the carriage 11. The main scanning position detection device 5 recognizes the position of the stage 4, and the main scanning drive device 60 controls the movement of the stage 4, whereby the stage 4 can be moved to, and stopped at, a desired position. Similarly, the sub-scanning position detection device 12 recognizes the position of the carriage 11, and the sub-scanning drive device 61 controls the movement of the carriage 11, whereby the carriage 11 can be moved to, and stopped at, a desired position. The head drive circuit 62 is a circuit for driving the droplet-discharge heads 15 and outputting a nozzle drive signal for controllably driving the piezoelectric elements 40 of the droplet-discharge heads 15.
The input device 65 is a device for inputting various processing conditions for discharging droplets 41, and, e.g., receiving and inputting coordinates for discharging droplets 41 onto the substrate 7 from an external device (not shown). The display device 66 is a device for displaying processing conditions and operating conditions. The operator uses the input device 65 to perform operations on the basis of information displayed on the display device 66.
The weight measurement device 25 has a plurality of electronic scales 44 and a plurality of catch pans 45 (containers). The weight measurement device 25 is configured and arranged to measure the weight of the droplets 41 discharged by the droplet-discharge heads 15 by measuring the weight of the catch pans 45 for receiving the droplets 41. More specifically, the weight of the catch pans 45 before and after the droplets 41 are discharged is measured, and the measurements are sent to the CPU 58.
The maintenance stage drive device 67 is a device for moving the maintenance stage 22 so that the first flushing unit 23, the second flushing unit 24, and the weight measurement device 25 are located at a position facing the droplet-discharge heads 15. After the main scanning position detection device 5 detects the position of the maintenance stage 22, the maintenance stage drive device 67 moves the maintenance stage 22, whereby specific devices or units can be reliably moved to locations facing the droplet-discharge heads 15.
The memory 59 is a semiconductor memory such as a RAM or ROM, or an external storage device such a hard disk or CD-ROM. Functionally, a storage area is provided for storing program software 68 on which is written a control procedure for the operation of the droplet discharge device 1. Furthermore, a storage area is provided for storing discharge position data 69, which is data on the coordinates of the discharge positions on the substrate 7.
Additionally, a storage area is provided for storing measurement drive data 70 for driving the piezoelectric elements 40 when the weight of the droplets 41 discharged from the nozzles 36 is measured. Furthermore, a storage area is provided for storing weight measurement data 71 for the droplets 41 measured by the weight measurement device 25.
Also provided are a storage area for storing a main scanning displacement by which the substrate 7 moves in the main scanning direction (Y direction), and a sub-scanning displacement by which the carriage 11 moves in the sub-scanning direction (X direction); a storage area that functions as a work area, temporary files, or the like for the CPU 58; and various other storage areas.
The CPU 58 performs control for discharging the functional liquid 38 as droplets 41 at specific positions on the surface of the substrate 7 in accordance with the program software 68 stored in the memory 59. This specific function is achieved by a weight measurement computing section 72 as a control device for performing calculations in order to measure weight. Furthermore, the CPU 58 has a cleaning computing section 73 for calculating the timing for cleaning the droplet-discharge heads 15, and an air guard control computing section 74 as a control device for controlling the timing to move the wind-guard cover 27 up and down.
The CPU 58 also has a discharge computing section 75 and other components for performing calculations for discharging the droplets 41 through the droplet-discharge heads 15. To describe the discharge computing section 75 in greater detail, the discharge computing section 75 has a main scanning control computing section 76 for calculating controls for moving the substrate 7 in scanning mode at a specific speed in the main scanning direction (Y direction). The discharge computing section 75 also has a sub-scanning control computing section 77 for calculating controls for moving the droplet-discharge heads 15 by a specific sub-scanning amount in the sub-scanning direction (X direction). Furthermore, the discharge computing section 75 has various function computing sections such as a nozzle discharge control computing section 78 or the like for performing calculations for controlling which nozzles 36 among the plurality of nozzles 36 in the droplet-discharge heads 15 will be operated to discharge the functional liquid 38.
Weight Measurement Method
The following is a description, made with reference to FIGS. 7 through 9, of the method for measuring the weight of the functional liquid discharged by the droplet-discharge heads, using the droplet discharge device 1 described above. FIG. 7 is a flowchart showing the manufacturing steps for measuring the weight of the functional liquid discharged by the droplet-discharge heads. FIGS. 8 and 9 are drawings for describing the measurement method for measuring the weight of the functional liquid discharged by the droplet-discharge heads.
In the flowchart of FIG. 7, step S1 is a horizontal movement step in which the maintenance stage is moved horizontally to move the weight measurement device to a specific location opposite the droplet-discharge heads. The process then advances to step S2. Step S2 is a discharge step in which droplets are discharged from the droplet-discharge heads onto the catch pans. Step S1 and step S2 together constitute step S11, which is a placement step. In this step, the measurement object is placed in the catch pans. The process then advances to step S3. Step S3 is a horizontal movement step in which the maintenance stage is moved to move the weight measurement device to a location opposite the wind-guard cover. The process then advances to step S4. Step S4 is a lowering step in which the wind-guard cover is lowered to cover the catch pans. Step S3 and step S4 together constitute step S12, which is a cover-setting step. This step is a step for covering the catch pans with the wind-guard cover. The process then advances to step S5. Step S5 is a measurement step for measuring the weight of the catch pans and the weight of the droplets discharged onto the catch pans. The process then advances to step S6. Step S6 is a cover removal step in which the wind-guard cover is raised and the catch pans and wind-guard cover are separated. The process then advances to step S7. Step S7 is an unmeasured head confirmation step in which it is confirmed whether or not there are any droplet-discharge heads that have not been measured. When there are droplet-discharge heads that have not been measured (when there are unmeasured heads), the process advances to step S1. When there are no droplet-discharge heads that have not been measured (when there are no unmeasured heads), the manufacturing steps for measuring the weight of the functional liquid discharged by the droplet-discharge heads are ended.
Next, FIGS. 8 and 9 will be used to give a detailed description of the manufacturing method in accordance with the steps shown in FIG. 7.
FIGS. 8( a) and 8(b) are drawings corresponding to step S1. As shown in FIG. 8( a), droplet-discharge heads 15 are standing by at a location opposite the substrate 7 disposed on the stage 4. To simplify the drawing and make it easier to understand, only three droplet-discharge heads 15 are shown. The stage 4 is then moved away from the location opposite the droplet-discharge heads 15. Next, as shown in FIG. 8( b), the maintenance stage 22 is moved so that one of the droplet-discharge heads 15 is positioned at a location opposite a catch pan 45.
FIG. 8( c) is a view that corresponds to step S2. As shown in FIG. 8( c), droplets 41 are discharged from the nozzle 36 of the droplet-discharge head 15 onto the catch pan 45. The number of discharges can be equivalent to an amount of functional liquid 38 that can be stably measured by the electronic scales 44. In the present embodiment, 1000 discharges are used, for example.
The droplet-discharge heads 15 that are standing by at locations opposite the first flushing unit 23 and second flushing unit 24 discharge droplets 41 at specific time intervals. Difficulty in discharging the droplets 41 is prevented by drying the nozzles 36.
FIG. 9( a) is a view that corresponds to step S3. As shown in FIG. 9( a), the maintenance stage 22 is moved so that one individual wind-guard cover 47 is positioned at a location opposite a catch pan 45. At this time, the end part 47 b of the individual wind-guard cover 47 and the end part 48 b of the overall wind-guard cover 48 are positioned at locations opposite the support part 43. The position of the maintenance stage 22 is controlled so that the end part 47 b and the end part 48 b are not positioned at a location opposite the first flushing unit 23, the second flushing unit 24, or the catch pan 45.
FIG. 9( b) is a view that corresponds to steps S4 and S5. As shown in FIG. 9( b), lowering the support part 50 causes the individual wind-guard cover 47 and the overall wind-guard cover 48 to form a lid over the catch pan 45. The air flow that moves around the periphery of the overall wind-guard cover 48 is prevented from coming into contact with the catch pan 45.
Next, the proximity sensor 53 shown in FIG. 3 senses that the individual wind-guard cover 47 and the overall wind-guard cover 48 have moved lower. After the catch pan 45 has been covered by the individual wind-guard cover 47 and the overall wind-guard cover 48, an electronic scale 44 initiates the weight measurement of the catch pan 45. After the electronic scale 44 has measured the weight of the catch pan 45, the weight measurement computing section 72 calculates the weight of the droplets 41 in this one discharge. The CPU 58 then stores the calculated weight measurement data 71 in the memory 59.
FIG. 9( c) is a view that corresponds to step S6. As shown in FIG. 9( c), the wind-guard cover drive device 28 separates the individual wind-guard cover 47 and the overall wind-guard cover 48 from the catch pan 45 by raising the support part 50. The maintenance stage 22 can then be moved.
In step S7, the CPU 58 confirms whether or not the discharged amounts of all the droplet-discharge heads 15 have been measured. Specifically, the CPU 58 confirms whether or not the number of pieces of weight measurement data 71 stored in the memory 59 is the same as the total number of droplet-discharge heads 15. When there are any unmeasured droplet-discharge heads 15, the CPU 58 pinpoints the unmeasured droplet-discharge heads 15. Steps S1 through S6 are repeated and the discharged amounts are measured for the pinpointed unmeasured droplet-discharge heads 15. When there are no unmeasured droplet-discharge heads 15, the manufacturing steps for measuring the weight of the functional liquid 38 discharged by the droplet-discharge heads 15 are ended.
Next, an adjustment step is performed for adjusting the voltage of the nozzle drive signal so that the amount discharged by each droplet-discharge head 15 approaches a target discharge amount. A coating step for discharging droplets 41 from the nozzles 36 to coat the substrate 7 is subsequently performed, and a specific pattern is drawn on the substrate 7. Next, the sprayed functional liquid 38 is dried in a drying step. The substrate 7 having a pattern formed thereon is completed by means of the steps described above.
FIG. 10 is a graph for describing the effect of the transverse air-blocking parts. FIG. 10( a) shows the fluctuation in the weight of the catch pans 45 and droplets 41 measured by the electronic scales 44 when individual wind-guard covers 47 having no transverse air-blocking parts 47 a are provided. FIG. 10( b) shows the fluctuation in the weight of the catch pans 45 and droplets 41 measured by the electronic scales 44 when individual wind-guard covers 47 having transverse air-blocking parts 47 a are provided.
In FIGS. 10( a) and 10(b), the horizontal axis shows the passage of time 81, and the vertical axis shows the weight 82 measured by the electronic scales 44. In FIG. 10( a), the measured value transition line 83 indicates the transition in the weight 82 measured by the electronic scales 44 immediately after individual wind-guard covers 47 having no transverse air-blocking parts 47 a are placed at locations opposite the catch pans 45. The measured value transition line 83 gradually attenuates in amplitude after the individual wind-guard covers 47 are placed in position, and stabilizes after about 15 seconds. The weight measurement computing section 72 measures the weight 82 after the measured value transition line 83 stabilizes.
In FIG. 10( b), the measured value transition line 84 indicates the transition in the weight 82 measured by the electronic scales 44 immediately after individual wind-guard covers 47 having transverse air-blocking parts 47 a are placed at locations opposite the catch pans 45. The measured value transition line 84 gradually attenuates in amplitude after the individual wind-guard covers 47 are placed in position, and stabilizes after about 5 seconds. The weight measurement computing section 72 measures the weight 82 after the measured value transition line 84 stabilizes. When the individual wind-guard covers 47 do not have transverse air-blocking parts 47 a, the catch pans 45 vibrate readily because the air flow that moves between the individual wind-guard covers 47 and the catch pans 45 comes into contact with the catch pans 45. When the individual wind-guard covers 47 have transverse air-blocking parts 47 a, the catch pans 45 do not readily vibrate because there is no entry of the air flow that moves between the individual wind-guard covers 47 and the catch pans 45. The value measured by the electronic scales 44 stabilizes more rapidly when there are transverse air-blocking parts 47 a than when there are no transverse air-blocking parts 47 a. Furthermore, fluctuation is smaller in the stabilized measured value, and more precise measurement is possible.
According to the present embodiment, the following effects are achieved as described above.
(1) According to the present embodiment, the individual wind-guard covers 47 have transverse air-blocking parts 47 a. In the catch pans 45, the individual wind-guard covers 47 prevent the air flow that moves in the direction of gravitational acceleration from coming into contact with the catch pans 45. Furthermore, the transverse air-blocking parts 47 a block the flow of gases, whereby the moving air flow is prevented from coming into contact with the catch pans 45 from the side surfaces. Therefore, the weight measurements of the functional liquid 38 are prevented from being caused to fluctuate by the contact of a moving air flow with the catch pans 45. As a result, the weight of the functional liquid 38 can be accurately measured. The term “an air flow that moves from a side surface” and the term “air flow flowing in a transverse direction with respect to the container” refers to an air flow that moves in a direction substantially orthogonal to the direction of gravitational acceleration (direction of gravity).
(2) According to the present embodiment, the wind-guard cover drive device 28 moves the individual wind-guard covers 47 and the catch pans 45 away from each other by raising the individual wind-guard covers 47. Therefore, there is no sliding of the catch pans 45 and individual wind-guard covers 47, and the catch pans 45 therefore do not rub against the individual wind-guard covers 47 and do not vibrate. As a result, it is possible to prevent the catch pans 45 from vibrating and the weight measurements of the functional liquid 38 from fluctuating. As a result, the weight of the measurement object can be accurately measured.
(3) According to the present embodiment, the weight of the catch pans 45 and the droplets 41 is measured after the wind-guard cover drive device 28 uses the proximity sensor 53 to sense that the individual wind-guard covers 47 are in proximity to the catch pans 45. Therefore, since the measurement object is measured after a moving air flow is prevented from coming into contact with the catch pans 45, it is possible to prevent the catch pans 45 from being vibrated by an air flow, and thus, it is possible to prevent the weight measurements from fluctuating. As a result, the weight of the discharged droplets 41 can be accurately measured.
(4) According to the present embodiment, the air cylinders 51 urge the wind-guard cover 27 and the catch pans 45 towards each other. When the pressure of the gas supplied to the air cylinders 51 decreases, the coil springs 52 urge the wind-guard cover 27 and the catch pans 45 away from each other. The wind-guard cover 27 and the catch pans 45 separate from each other when the pressure of the gas supplied to the air cylinders 51 decreases. The wind-guard cover 27 and catch pans 45 remain separated from each other even when the maintenance stage 22 moves, and the wind-guard cover 27 and catch pans 45 can therefore be prevented from coming into contact and being damaged.
(5) According to the present embodiment, end parts 47 b and an end part 48 b are disposed between the individual wind-guard covers 47 and the support part 43, and between the overall wind-guard cover 48 and the support part 43. The end parts 47 b and the end part 48 b come into contact with the cover receiving part when the individual wind-guard covers 47 and the overall wind-guard cover 48 come in proximity to the support part 43. At this time, the support part 43 is prevented from vibrating because of the deformation in the end parts 47 b and the end part 48 b. The catch pans 45 are prevented vibrating due to transmission of the vibration of the support part 43 to the catch pans 45, and the weight measurements of the functional liquid 38 are prevented from fluctuating. As a result, the weight of the functional liquid 38 can be accurately measured.
(6) According to the present embodiment, an air flow that moves towards the wind-guard cover 27 comes into contact with the windbreak part 29, whereby the speed of the air flow is reduced. Therefore, the speed of the air flow that comes into contact with the wind-guard cover 27 can be reduced in comparison with a case in which there is no windbreak part 29. Vibration of the containers can be inhibited because the air flow that comes into contact with the wind-guard cover 27 is further slowed down. Therefore, since it is possible to prevent the catch pans 45 from vibrating and the weight measurements of the measurement object from fluctuating, the weight of the functional liquid 38 can be accurately measured.
(7) According to the present embodiment, since a temperature-adjusted gas flows to the periphery of the weight measurement device 25, the temperature of the weight measurement device 25 can be managed. Therefore, since the weight measurement device 25 measures the weight of the droplets 41 in a state not easily affected by temperature, the weight of the functional liquid 38 can be accurately measured.
(8) According to the present embodiment, covering a plurality of catch pans 45 with one overall wind-guard cover 48 allows the catch pans 45 to be covered by a smaller number of overall wind-guard covers 48 than the number of catch pans 45. As a result, a simple configuration can be achieved.
(9) According to the present embodiment, one catch pan 45 is covered by an individual wind-guard cover 47 and an overall wind-guard cover 48. Therefore, a moving air flow can be made less likely to come into contact with the catch pans 45, as opposed to a case in which one catch pan 45 is covered by one wind-guard cover selected from among the individual wind-guard covers 47 and the overall wind-guard cover 48. As a result, the weight measurement device 25 can perform measurements without being affected by the moving air flow, and the weight of the functional liquid 38 can be accurately measured.
(10) According to the present embodiment, droplets 41 are discharged onto the catch pans 45 after the wind-guard cover 27 is moved away from the upper spaces of the catch pans 45, and the droplets 41 are therefore readily discharged onto the catch pans 45. Accordingly, the weight of the droplets 41 can be measured more easily. The term “upper space” as used herein refers to a space at a location adjacent to the container in a direction substantially opposite to the direction of gravitational acceleration in relation to the container.
(11) According to the present embodiment, since the maintenance stage 22 moves the weight measurement device 25 to a location opposite the droplet-discharge heads 15, the weight of the discharged droplets 41 can be measured in a simple manner after the droplets 41 are discharged onto the catch pans 45.
(12) According to the present embodiment, droplets 41 are discharged onto the first flushing unit 23 and the second flushing unit 24 from the standby droplet-discharge heads 15. It is then possible to prevent part of the functional liquid 38 in the nozzles 36 of the droplet-discharge heads 15 from evaporating, and the viscosity of the functional liquid 38 from increasing. Furthermore, since the catch pans 45 are in proximity to the first flushing unit 23 and the second flushing unit 24, the droplet-discharge heads 15 can be moved to a location opposite the catch pans 45, and measurement can be initiated before the functional liquid 38 increases in viscosity.
(13) According to the present embodiment, the end parts 47 b of the individual wind-guard covers 47 and the end part 48 b of the overall wind-guard cover 48 are brought in proximity to, or into contact with, locations on the support part 43 other than the first flushing unit 23, the second flushing unit 24, and the catch pans 45, whereby functional liquid 38 is made less likely to adhere to the end parts 47 b and the end part 48 b. Therefore, the functional liquid 38 can be prevented from corroding the end parts 47 b and the end part 48 b. (14) According to the present embodiment, in the cover-setting step of step S12, gas flowing from the top and the side surfaces toward the catch pans 45 is covered by the wind-guard cover 27. Therefore, the weight measurements of the functional liquid 38 are prevented from fluctuating as a result of flowing gas coming into contact with the catch pans 45. As a result, the weight of the functional liquid 38 can be accurately measured.
Referring now to FIG. 11, a droplet discharge device 85 in accordance with a second embodiment will now be explained. In view of the similarity between the first and second embodiments, the parts of the second embodiment that are identical to the parts of the first embodiment will be given the same reference numerals as the parts of the first embodiment. Moreover, the descriptions of the parts of the second embodiment that are identical to the parts of the first embodiment may be omitted for the sake of brevity.
The second embodiment differs from the first embodiment in that a plurality of wind-guard covers 86 are driven separately.
Specifically, in the second embodiment, the droplet discharge device 85 has the same number of the individual wind-guard covers 86 as the number of the catch pans 45, as shown in FIG. 11. The individual wind-guard covers 86 each have a wind-guard cover drive device 87, which controls the raising and lowering of the corresponding one of the individual wind-guard covers 86. The maintenance stage 22 is moved to move the catch pans 45 to a location opposite the individual wind-guard covers 86. The wind-guard cover drive devices 87 are driven to lower the individual wind-guard covers 86, and the weight of the catch pans 45 and the droplets 41 is then measured. At this time, weight measurement can be performed without being affected by a moving air flow.
(1) According to the present embodiment, one individual wind-guard cover 86 covers one catch pan 45, whereby each individual wind-guard cover 86 can be formed to a shape corresponding with the shape of the catch pan 45. The individual wind-guard covers 86 can then reliably cover the catch pans 45. As a result, the weight measurement device 25 can perform measurements without being affected by a moving air flow, and the weight of the functional liquid 38 can therefore be accurately measured.
(2) According to the present embodiment, since each individual wind-guard cover 86 has a wind-guard cover drive device 87, the distance between the individual wind-guard covers 86 and the catch pans 45 is easily adjusted when the individual wind-guard covers 86 are lowered. Therefore, maintenance can be performed easily.
Referring now to FIG. 12, a droplet discharge device 88 in accordance with a third embodiment will now be explained. In view of the similarity between the first, second and third embodiments, the parts of the third embodiment that are identical to the parts of the first or second embodiment will be given the same reference numerals as the parts of the first or second embodiment. Moreover, the descriptions of the parts of the third embodiment that are identical to the parts of the first or second embodiment may be omitted for the sake of brevity.
The third embodiment differs from the first embodiment in that a groove 90 b is formed in a support part 90 for supporting a weight measurement device 89, and the end part 47 b of the wind-guard cover 47 fits into the groove 90 b. FIGS. 12( a) and 12(b) are partial schematic cross-sectional views showing the structure of the wind-guard covers. Specifically, in the present embodiment, the weight measurement device 89 of the droplet discharge device 88 is provided with grooves 90 b formed as recesses or concavities in a top surface 90 a, which serves as a cover receiving part in the support part 90 for supporting the electronic scales 44, as shown in FIG. 12( a). The grooves 90 b enclose peripheries of the catch pans 45 and are formed into substantially the same shape as the end parts 47 b of the individual wind-guard covers 47. The grooves 90 b are formed so as to allow the end parts 47 b to fit into the grooves 90 b, and the end parts 47 b fit into the grooves 90 b when the individual wind-guard covers 47 are lowered to cover the catch pans 45.
When raised as shown in FIG. 12( b), the individual wind-guard covers 47 move to the top sides of the catch pans 45. The weight measurement device 89 can then be moved in the Y direction by moving the maintenance stage 22.
(1) According to the present embodiment, since the end parts 47 b of the individual wind-guard covers 47 are inserted into the grooves 90 b formed in the support part 90, an air flow that moves toward the individual wind-guard covers 47 does not readily pass between the individual wind-guard covers 47 and the support part 90. Therefore, the air flow does not readily come into contact with the catch pans 45, and the catch pans 45 are not readily vibrated, whereby the weight measurements of the functional liquid 38 are prevented from fluctuating. As a result, the weight of the functional liquid 38 can be accurately measured.
(2) According to the present embodiment, an air flow can be prevented from flowing into the individual wind-guard covers 47 without bringing the individual wind-guard covers 47 into contact with the support part 90. The support part 90 does not readily vibrate because the individual wind-guard covers 47 do not come into contact with the support part 90. As a result, the weight of the functional liquid 38 can be accurately measured.
The present embodiments are not limited to the embodiments described above, and various modifications and improvements can be added. Some examples of the modification are described hereinbelow.
In the first embodiment, the air cylinders 51 were used as the wind-guard cover drive device 28, but the drive method is not limited to this option alone, and other drive methods may be used. Examples that may be used include a translation mechanism using a motor and a ball spring, a translation mechanism using a linear motor, and a translation mechanism using a rack and pinion. The mechanism for moving the wind-guard cover 27 may be used. The same effects can be achieved.
In the first embodiment, the coil springs 52 (elastic members) were used to provide an urging force, but air springs, rubber, plate springs, and other components may also be used to provide urging force.
In the first embodiment, the individual wind-guard cover 47 covered one catch pan 45, but one individual wind-guard cover 47 may cover two or more catch pans 45 simultaneously. The device can be simplified by reducing the number of individual wind-guard covers 47.
In the first embodiment, the end parts 47 b of the individual wind-guard covers 47 and the end part 48 b of the overall wind-guard cover 48 were formed from an elastic material. Another option is to form the end parts 47 b and the end part 48 b from a non-elastic material, and to place elastic parts formed from an elastic material at locations opposite the end parts 47 b and the end part 48 b in the top surface 43 a of the support part 43.
In the first embodiment, one catch pan 45 is covered by two wind-guard covers; namely, the individual wind-guard cover 47 and the overall wind-guard cover 48. The present invention is not limited to this option alone, and the catch pans 45 may each be covered using three or more wind-guard covers. The flow of air can be even more reliably prevented from coming into contact with the catch pans 45.
In the third embodiment, grooves 90 b corresponding to the individual wind-guard covers 47 were formed, but a groove corresponding to the overall wind-guard cover 48 may also be formed. A moving air flow can be blocked in the overall wind-guard cover 48, similar to the individual wind-guard covers 47.
In the first embodiment, the wind-guard cover drive device 28 raised and lowered the wind-guard cover 27 to cover the weight measurement device 25, but another option is to fix the wind-guard cover 27 in place and to raise and lower the weight measurement device 25. An electronic scale raising/lowering device can be provided for raising and lowering the electronic scales 44, and the catch pans 45 may be covered by the wind-guard cover 27 when the electronic scale raising/lowering device raises the electronic scales 44. The catch pans 45 and the wind-guard cover 27 may separate when the electronic scale raising/lowering device lowers the electronic scales 44. At this time, the wind-guard cover drive device 28 is not installed because the wind-guard cover drive device 28 is not needed. When the wind-guard cover drive device 28 is not disposed on the top side of the wind-guard cover 27, the wind-guard cover 27 is easily detached, and maintenance on the catch pans 45 is therefore easily performed.
In the second embodiment, the individual wind-guard covers 86 may similarly be fixed in place and the weight measurement device 25 may be raised and lowered. An electronic scale raising/lowering device for raising and lowering the electronic scales 44 may be provided to each electronic scale 44. Since only the electronic scales 44 used for measurement are raised and lowered, a device can be obtained that conserves energy in comparison with cases in which all of the electronic scales 44 are raised and lowered.
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