Patent Application
20240351102
This invention relates to an alloy powder manufacturing apparatus for manufacturing alloy powder.
For example, an existing method for manufacturing alloy powder is disclosed in Patent Document 1, the content of which is incorporated herein in its entirety by reference.
As disclosed in Patent Document 1, a water atomization method and a gas atomization method are known as typical manufacturing methods of alloy powder.
However, an alloy powder manufactured by a water atomization method or a gas atomization method often varies in quality.
It is therefore an object of the present invention to provide an alloy powder manufacturing apparatus suitable for a new manufacturing method of an alloy powder which replaces the water atomization method and the gas atomization method.
The existing typical water atomization method or gas atomization method is a rapid cooling atomization method in which water or gas is used to divide molten alloy so that particles are formed and thereafter coolant liquid such as coolant water is used to rapidly cool the particles. However, the particles have different cooling rates from each other dependent on sizes of the divided particles. In addition, the divided particles will fall on different positions from each other with different velocities from each other. Therefore, the divided particles are cooled in atmosphere for different times from each other until they fall on the coolant liquid. The particles vary in quality because of the various reasons described above.
The present invention solves the aforementioned problem by substantially simultaneously performing division and cooling of the molten alloy. More specifically, according to the present invention, a certain mass of the molten alloy, depending on which the molten alloy can be prevented from getting cooled, is supplied to a liquid film made of coolant liquid. Thereafter, the molten alloy is divided into particles by the liquid film, and each particle is also cooled by the liquid film. According to the aforementioned manufacturing method, the divided particles are cooled similarly to each other, and thereby homogeneous particles can be obtained.
The alloy powder manufacturing apparatus of the present invention is an apparatus which is suitable for the aforementioned manufacturing method. More specifically, the present invention provides the alloy powder manufacturing apparatus described below.
An aspect of the present invention provides an alloy powder manufacturing apparatus comprising a base portion, at least one nozzle and at least one alloy supplying portion. The nozzle supplies high speed fluid made of coolant liquid onto the base portion and forms a liquid film with a predetermined thickness so that a predetermined acceleration is applied to the liquid film along a thickness direction. The alloy supplying portion supplies molten alloy to the liquid film without dividing the molten alloy into a size equal to or less than the predetermined thickness. The high-speed fluid divides the molten alloy into a size equal to or less than the predetermined thickness to form particles, and the predetermined acceleration keeps the particles in the liquid film so that the particles are continuously in contact with the high-speed fluid and are cooled thereby.
A homogeneous alloy powder can be formed by using the alloy powder manufacturing apparatus of an aspect of the present invention. Thus, an aspect of the present invention provides an alloy powder manufacturing apparatus suitable for a new manufacturing method of an alloy powder which replaces the water atomization method and the gas atomization method.
An appreciation of the objectives of the present invention and a more complete understanding of its structure may be had by studying the following description of the preferred embodiment.
Referring to
The nozzle 30 supplies high-speed fluid made of coolant liquid such as coolant water onto the base portion 12 with high pressure and forms a liquid film 50 with a predetermined thickness PT on the base portion 12. The high-speed fluid is the coolant liquid which flows at high speed along a direction indicated by an arrow A. The alloy powder manufacturing apparatus 10 is configured so that a predetermined acceleration is applied to the liquid film 50 along a direction indicated by an arrow B. Thus, the nozzle 30 forms the liquid film 50 so that the predetermined acceleration is applied to the liquid film 50 along a thickness direction of the liquid film 50. The number of the nozzle 30 of the present embodiment is two. However, the present invention is not limited thereto. For example, the number of the nozzle 30 may be one, three or more. Thus, the alloy powder manufacturing apparatus 10 should comprise at least one nozzle 30. The at least one nozzle 30 may include a plurality of the nozzles 30.
The alloy supplying portion 40 supplies molten alloy 60 to the liquid film 50 without dividing the molten alloy 60 into a size equal to or less than a predetermined thickness PT. Thus, in the present embodiment, a certain mass of the molten alloy 60 is supplied to the liquid film 50 without being divided unlike an existing rapid cooling atomization method in which particles are formed by dividing the molten alloy 60 and then rapidly cooled by the liquid film 50. The number of the alloy supplying portion 40 of the present embodiment is one. However, the present invention is not limited thereto. For example, the number of the alloy supplying portion 40 may be two or more. Thus, the alloy powder manufacturing apparatus 10 should comprise at least one alloy supplying portion 40. The at least one alloy supplying portion 40 may include a plurality of alloy supplying portions 40.
When a certain mass of the molten alloy 60 is supplied to the liquid film 50 without being divided, the molten alloy 60 is divided into a size equal to or less than the predetermined thickness PT by the liquid film 50 made of the high-speed fluid, and the particles are formed. When the particles are brought into contact with the liquid film 50, the particles are cooled by the coolant liquid. Meanwhile, the coolant liquid around the particles is instantaneously evaporated. However, the liquid film 50 of the present embodiment has the predetermined acceleration. Even after the coolant liquid around the particles is evaporated, the predetermined acceleration keeps the particles being pressed against and in contact with the coolant liquid of the high-speed fluid. Summarizing the explanation described above, in the alloy powder manufacturing apparatus 10, the high-speed fluid divides the molten alloy 60 into a size equal to or less than the predetermined thickness PT to form the particles, and the predetermined acceleration keeps the particles in the liquid film 50 so that the particles are continuously in contact with the high-speed fluid and are cooled thereby.
An existing rapid cooling atomization method has a problem of being costly. For example, large equipment is often required. In addition, high-pressure gas facilities and gas expense are required. Moreover, because the divided particles are considerably cooled before their fall on a liquid film, there is a problem that cooling rate of the particles after fall on the liquid film is lowered. In contrast, in the alloy powder manufacturing apparatus 10 of the present embodiment, the molten alloy 60 is substantially simultaneously divided and cooled in the liquid film 50, and thereby difference in the cooling rate among the particles is reduced. As a result, homogeneous particles can be obtained.
In a situation in which the divided particles insufficiently cooled in the liquid film 50, the particles would hit the base portion 12 which is located at the bottom of the liquid film 50 before they completely solidify. The thus-hit particles might have irregular shapes. As a solution of this problem in the present embodiment, the predetermined acceleration in the thickness direction of the liquid film 50, or in the direction along the arrow B, is designed to be 2.0×104 G or more, and the predetermined thickness PT of the liquid film 50 is designed to be 0.1 mm or more. Sufficient cooling ability cab be obtained under the condition where the predetermined acceleration is 2.0×104 G or more. The irregular shape particles can be reduced in number under the condition where the predetermined thickness PT of the liquid film 50 is 0.1 mm or more since the divided particles, or droplets, will not hit the base portion 12 before solidification. As described above, according to the present embodiment, the particles solidify before they fall on the base portion 12 located at the bottom of the liquid film 50 and have sphere shapes or almost sphere shapes. The thus-obtained particles are sufficiently uniform even in their shapes. The aforementioned manufacturing method of an alloy powder according to the present embodiment is particularly suitable to manufacture a soft magnetic powder.
A maximum distance between the alloy supplying portion 40 and the liquid film 50 is preferred to be 300 mm or less. In detail, the alloy supplying portion 40 is formed with a supplying opening through which the molten alloy 60 is supplied to the liquid film 50. A maximum distance between the supplying opening of the alloy supplying portion 40 and the liquid film 50 is preferred to be 300 mm or less. In an instance where the distance between the alloy supplying portion 40 and the liquid film 50 is too long, the molten alloy 60 is cooled to some extent until it falls on the liquid film 50 and the effect which is obtained as a result of the rapid cooling of the particles by the liquid film 50 is reduced. In addition, the speed of the molten alloy 60 is increased at the time when it falls on the liquid film 50, and the molten alloy 60 might not be properly divided by the liquid film 50.
For example, the base portion 12 may be an inner wall 22 of a drum, and the inner wall 22 of the drum may have, at least in part, curvature so that the predetermined acceleration is generated in the liquid film 50. When the coolant liquid is continuously supplied from the nozzle 30 onto the thus-formed base portion 12, a centrifugal acceleration directed along the thickness direction of the base portion 12, or directed toward the inner wall 22 of the drum, is generated at least at the part which has the curvature. This centrifugal acceleration may be used as the predetermined acceleration. In other words, the predetermined acceleration may be the centrifugal acceleration which is generated by using the curvature of the inner wall 22 of the drum and is directed toward the inner wall 22. The aforementioned curvature is preferred to have a curvature radius of 100 mm or less for obtaining a required predetermined acceleration. In an instance where the centrifugal acceleration is used as the predetermined acceleration, the alloy supplying portion 40 supplies the molten alloy 60 to the high-speed fluid at an upstream side of a part of the inner wall 22 of the drum which has the curvature, or a part at which the centrifugal acceleration is generated. The alloy powder can be efficiently and continuously cooled by an apparatus with a simple structure by using the centrifugal acceleration as the predetermined acceleration.
The coolant liquid supplied from the nozzle 30 is preferred to have an initial velocity of 80 m/s or more, and the predetermined acceleration is preferred to be 1.0×107 G or less. When the initial velocity of the coolant liquid is less than 80 m/s, the liquid film 50 has poor ability to divide the molten alloy 60. Such poor ability makes the divided droplets in the liquid film 50 large, and the droplets are more frequently deformed during cooling. As a result, excessively large particles each having a long shape are increased in number. Thus, the irregular shape particles are easily formed. When the initial velocity of the coolant liquid is 80 m/s or more, sufficient ability to divide the molten alloy 60 can be obtained, and thereby the particles each having a sphere shape or an almost sphere shape can be obtained.
In particular, when the coolant liquid supplied from the nozzle 30 has an initial velocity of 100 m/s or more, the particles are made extremely fine, and amorphous feature and magnetic characteristics thereof are improved. Accordingly, the initial velocity of the coolant liquid is further preferred to be 100 m/s or more. However, in an instance where the initial velocity of the coolant liquid supplied from the nozzle 30 exceeds 800 m/s, although fine particles can be obtained, particles of thread-like shapes are increased in number. Accordingly, the initial velocity of the coolant liquid is further preferred to be 800 m/s or less.
In addition to the condition about the initial velocity of the coolant liquid, from a viewpoint of obtaining sufficient ability to divide the molten alloy 60, the coolant liquid is preferred to have a velocity of 40 m/s or more at a position where the molten alloy 60 falls.
The predetermined acceleration of the liquid film 50 is further preferred to be 3.0×104 G or more. When the predetermined acceleration is made high, the cooling ability can be improved. The thus-achieved high cooling ability has advantage that even an alloy having a composition with low amorphous forming capability can be formed with amorphous phase.
The predetermined thickness PT is preferred to be 0.8 mm or more. When the thickness of the liquid film 50 is 0.8 mm or more, the divided droplets spread over a wide range in the liquid film 50, and thereby the divided droplets can be prevented from colliding with each other to be shaped into irregular shapes.
When the molten alloy 60 is supplied to the liquid film 50, the molten alloy 60 is preferred to be supplied only to a predetermined area which is located on the liquid film 50 and has a diameter of 15 mm or less. In other words, the alloy supplying portion 40 is preferred to be arranged so that the alloy supplying portion 40 supplies the molten alloy 60 only to the predetermined area which is located on the liquid film 50 and has a diameter of 15 mm or less. When the molten alloy 60 is supplied onto a region located within the predetermined area as described above, the alloy powder can be made stable in quality, and a structure with the base portion 12 which is used for forming the liquid film 50 can be reduced in size. The diameter of the predetermined area is further preferred to be 10 mm or less.
Referring to
The drum 20a has a cylindrical shape except for a part provided with the nozzles 30 and the opening of the entrance through which the molten alloy 60 is supplied. Thus, an inner wall 22 of the drum 20a has curvature depending on an inner diameter of the drum 20a. When the coolant liquid is supplied from the nozzle 30 and forms the liquid film 50 having the predetermined thickness PT on the inner wall 22 of the drum 20a so that the inner wall 22 of the drum 20a works as the base portion 12 of the aforementioned first embodiment, the centrifugal acceleration directed toward the inner wall 22 of the drum 20a is generated in the liquid film 50. In detail, the liquid film 50 made of the coolant liquid supplied from the nozzle 30 onto the inner wall 22 of the drum 20a flows downstream toward an exit of the drum 20a while swirling at high speed. The liquid film 50 receives the centrifugal acceleration along the thickness direction because of this high-speed swirl. In the present embodiment, this centrifugal acceleration is used as the predetermined acceleration described in the first embodiment. According to the present embodiment, the alloy powder can be efficiently and continuously cooled by an apparatus with a simple structure.
The molten alloy 60 supplied from the alloy supplying portion 40 falls in the drum 20a because of its own weight. An angle along which the molten alloy 60 is supplied to the liquid film 50 can be adjusted by changing the inclination of the drum 20a.
The drum 20a is preferred to have an inner diameter which is 10 mm or more but is 100 mm or less, and is further preferred to have an inner diameter which is 20 mm or more but is 60 mm or less. When the inner diameter of the drum 20a is made small, the centrifugal acceleration is made large, and thereby amorphous feature of the manufactured alloy powder is improved. The aforementioned effect is made profound by making the inner diameter of the drum 20a be 100 mm or less. For example, even when the molten alloy 60 has a composition in which Fe amount is 80 at % or more, particles having good amorphous feature can be formed. When the inner diameter of the drum 20a is 60 mm or less, the amorphous feature of the manufactured alloy powder is further improved. As the inner diameter of the drum 20a is made smaller, the amorphous feature is more improved. However, actually, when the inner diameter is less than 10 mm, the molten alloy 60 cannot be easily supplied into the drum 20a. Accordingly, the inner diameter of the drum 20a is preferred to be 10 mm or more. The inner diameter of the drum 20a is preferred to be 20 mm or more from a viewpoint of more stably supplying the molten alloy 60 to the liquid film 50.
In a process in which the molten alloy 60 is supplied to the liquid film 50, the molten alloy 60 can be stably supplied by intersecting the liquid film 50 with a supplying angle of the molten alloy 60, or an angle along which the molten alloy 60 flows. The particles can be made fine by enlarging the supplying angle of the molten alloy 60 relative to the liquid film 50. From the aforementioned viewpoint, the supplying angle of the molten alloy 60 relative to the liquid film 50 is preferred to be 10° or more but to be 90° or less. In other words, the alloy supplying portion 40 is preferred to be arranged so that the alloy supplying portion 40 supplies the molten alloy 60 to the liquid film 50 along a direction which makes an angle which is 10° or more but is 90° or less relative to the liquid film 50.
Explaining the relation between the drum 20a and the alloy supplying portion 40, when the short diameter of an entrance of the drum 20a is referred to as “Rmin”, and the distance between the alloy supplying portion 40 and the entrance of the drum 20a is referred to as “D”, the ratio of D relative to Rmin, or D/Rmin, is preferred to be 50 or less, wherein the units of both Rmin and D are “mm”. Thus, D (mm)/Rmin (mm) is preferred to be 50 or less. D (mm) is a distance between the supplying opening of the alloy supplying portion 40 which supplies the molten alloy 60 and the entrance through which the molten alloy 60 is supplied. Rmin (mm) is the short diameter of the entrance through which the molten alloy 60 is supplied. When the distance between the alloy supplying portion 40 and the entrance, or the entrance of the drum 20a, through which the molten alloy 60 is supplied is too long, the supplied molten alloy 60 will not linearly flow because of air resistance and environment but might flow while swinging or might flow while spreading.
Explaining the relation between the nozzles 30 and the alloy supplying portion 40, when the amount of the coolant liquid supplied from the nozzles 30 is referred to as “Aw”, and the supplied amount of the molten alloy 60 from the alloy supplying portion 40 is referred to as “Am”, the ratio of Am relative to Aw, or Am/Aw, is preferred to be one fifteenths or less, wherein the units of both Aw and Am are “kg/min”. When the supplied amount of the molten alloy 60 is too large relative to the supplied amount of the coolant liquid, the molten alloy 60 might not be sufficiently divided and cooled.
Referring to
The alloy powder manufacturing apparatus 10b according to the present embodiment further comprises an exit cover 24. The exit cover 24 is provided on an exit of a drum 20b. The exit cover 24 is formed with an opening which has an inner diameter smaller than another inner diameter of the drum 20b. Thus, the exit cover 24 has a function which makes the exit of the drum 20b smaller. According to this function, a film thickness of the liquid film 50 can be made thick.
Referring to
The alloy powder manufacturing apparatus 10c according to the present embodiment further comprises a scatter prevention portion 35. The scatter prevention portion 35 has a cylindrical shape and covers around the drum 20b. The liquid film 50 of the present embodiment is the coolant liquid which swirls at high speed along the inner wall 22 of the drum 20b. The thus-swirling coolant liquid is powerfully discharged from the exit of the drum 20b. The particles moved by the coolant liquid tend to be scattered when the coolant liquid is discharged. The scatter prevention portion 35 of the present embodiment surrounds at least around the vicinity of the exit of the drum 20b and catches the particles discharged from the drum 20b. The discharged alloy powder is easily collected since the alloy powder manufacturing apparatus 10c according to the present embodiment comprises the scatter prevention portion 35.
The scatter prevention portion 35 of the present embodiment has a cylindrical shape. However, the shape and the structure of the scatter prevention portion 35 are not specifically limited, provided that the alloy powder can be easily collected. For example, the scatter prevention portion 35 does not need to surround the drum 20b except for the vicinity of the exit of the drum 20b. Thus, the scatter prevention portion 35 may surround at least the vicinity of the exit of the drum 20b so that the alloy powder is easily collected.
The alloy powder manufacturing apparatus 10c according to the present embodiment can be formed by adding the scatter prevention portion 35 to the alloy powder manufacturing apparatus 10b according to the third embodiment. However, the present invention is not limited thereto. For example, the scatter prevention portion 35 may be added to the alloy powder manufacturing apparatus 10a according to the second embodiment.
Referring to
The alloy powder manufacturing apparatus 10d according to the present embodiment comprises a drum 20d. The drum 20d is arranged so that it horizontally extends. The molten alloy 60 is supplied from the alloy supplying portion 40 to the liquid film 50 through an opening which is formed in a part of the inner wall 22. The predetermined acceleration of the present embodiment is generated only by the gravity. However, the present invention is not limited thereto. For example, the predetermined acceleration may be increased by using another method.
The shape of the cross-section of the drum 20d of the alloy powder manufacturing apparatus 10d is not specifically limited. For example, the shape of the cross-section of the drum 20d may be a rectangle similar to that of a drum 20e of an alloy powder manufacturing apparatus 10e shown in
Referring to
The alloy powder manufacturing apparatus 10g according to the present embodiment comprises two of the alloy supplying portions 40. The two alloy supplying portions 40 supply the molten alloy 60 onto two parts of the liquid film 50, respectively. The alloy powder manufacturing apparatus of the present invention may comprise a plurality of the alloy supplying portions 40 similarly to the present embodiment.
The alloy powder manufacturing apparatus 10g according to the present embodiment can be formed by adding one of the alloy supplying portions 40 to the alloy powder manufacturing apparatus 10d according to the fifth embodiment. However, the present invention is not limited thereto. For example, one or more of the alloy supplying portions 40 may be added to one of the alloy powder manufacturing apparatuses 10a to 10c according to the second to fourth embodiments.
Referring to
The alloy powder manufacturing apparatus 1 Oh according to the present embodiment comprises a drum 20h. The drum 20h has a roughly cylindrical shape and is arranged so that it horizontally extends. The coolant liquid is supplied from the nozzle 30 onto the inner wall 22 of the drum 20h and forms the liquid film 50. The predetermined acceleration of the present embodiment is mainly the centrifugal acceleration which is generated in the liquid film 50 by supplying the coolant liquid from the nozzle 30. The molten alloy 60 is supplied from the alloy supplying portion 40 to the liquid film 50 through an opening which is formed in a part of the inner wall 22 of the drum 20h.
Referring to
The alloy powder manufacturing apparatus 10i according to the present embodiment comprises a drum 20i. The drum 20i has a horizontally planar portion which is provided on an end portion thereof. The horizontally planar portion of the drum 20i is formed with an opening which works as an entrance of the drum 20i. Thus, according to the present embodiment, the entrance of the drum 20i can be defined not based on a plane perpendicular to the axial direction of the drum 20i. Accordingly, a distance between the alloy supplying portion 40 and the entrance of the drum 20i can be more accurately calculated, and influence of the environment to the molten alloy 60 is easily evaluated regardless of the arranged place and the inclination of the drum 20i.
Referring to
As shown in
Referring to
Referring to
The first nozzle 32 is arranged at an upstream side of a position where the molten alloy 60 falls. The second nozzle 34 is arranged at a downstream side of the position where the molten alloy 60 falls. Thus, the coolant liquid supplied from the first nozzle 32 joins the coolant liquid supplied from the second nozzle 34 after passing through the position where the molten alloy 60 falls and thereafter flows downstream toward an exit of the drum 20k. Meanwhile, the coolant liquid supplied from the first nozzle 32 forms a first liquid film (liquid film) 52. The coolant liquid supplied from the second nozzle 34 increases the thickness of the first liquid film 52 and forms a second liquid film (liquid film) 54. Thus, the second liquid film 54 is thicker than the first liquid film 52 and has cooling ability higher than that of the first liquid film 52.
The first nozzle 32 supplies a relatively small amount of the coolant liquid which has a large initial velocity, and thereby the relatively thin first liquid film 52 is formed. For example, the coolant liquid supplied from the first nozzle 32 has an initial velocity of 170 m/s or more, and the first liquid film 52 has high ability to divide the molten alloy 60. The first liquid film 52 can form fine particles. On the other hand, the second nozzle 34 supplies a relatively large amount of the coolant liquid which has a relatively small initial velocity, and thereby the thick second liquid film 54 is formed. For example, the second liquid film 54 formed by the coolant liquid supplied from the second nozzle 34 has a thickness of 0.8 mm or more, and the second liquid film 54 has a large heat capacity which can sufficiently cool the fine particles. The fine particles can be sufficiently cooled even in an instance where the supplied amount of the molten alloy 60 is increased so that a large amount of the fine particles are formed.
Theoretically, the nozzle 30 is preferred to supply a large amount of the coolant liquid with a large initial velocity. However, a supplying facility such as an expensive pump is required in order for a large amount of the coolant liquid to be supplied with a large initial velocity. According to the present embodiment, high ability to divide the molten alloy 60 can be obtained by the upstream side first nozzle 32 while a large heat capacity can be obtained by the downstream side second nozzle 34. Thus, according to the present embodiment, a necessary amount of the fine particles can be obtained while increase in manufacturing cost is reduced.
The feature of the first liquid film 52 is not specifically limited, provided that the first nozzle 32 can form the first liquid film 52 from the coolant liquid having a large initial velocity. For example, the liquid film 52 formed by the coolant liquid supplied from the first nozzle 32 may have a thickness thinner than another thickness of the liquid film 54 formed by the coolant liquid supplied from the second nozzle 34. The feature of the coolant liquid supplied by the second nozzle 34 is not specifically limited, provided that the second nozzle 34 can form the second liquid film 54 thicker than the first liquid film 52 from the coolant liquid. For example, the coolant liquid supplied from the second nozzle 34 may have an initial velocity slower than another initial velocity of the coolant liquid supplied from the first nozzle 32.
Referring to
Alloy powders were manufactured under various conditions shown in Table 1 by using an alloy powder manufacturing apparatus according to an embodiment of the present invention. Table 2 shows evaluation about the obtained alloy powders.
Referring to Tables 1 and 2, when the inner diameter of the drum is more than 100 mm as shown in Comparative Example 1, the particles have irregular shapes and have undesirable characteristics. Moreover, when the initial velocity of the coolant liquid is less than 80 m/s as shown in Comparative Examples 2 and 3, the particles have irregular shapes and have undesirable characteristics. In contrast, the particles of Examples 1 to 19 have spere shapes or almost sphere shapes and have good amorphous feature. In addition, the particles of Examples 1 to 19 have good characteristics such as small coercivity.
In Examples 8 to 12, the inner diameter of the exit of the drum was made smaller than the inner diameter of the drum. When the inner diameter of the exit of the drum is made smaller than the inner diameter of the drum, the exit is formed with a barrier, and thereby the coolant liquid can be adjusted so that the thickness thereof is made thicker. The particle diameter can be controlled by this adjustment. For example, in a situation in which manufacture of the particles having large particle diameters is required, a relatively thick liquid film is necessary since a relatively long cooling time is necessary. As shown in Examples 8 to 12, the inner diameter of the exit of the drum should be smaller than the inner diameter of the drum in order for the relatively thick liquid film to be formed.
The present application is based on a Japanese patent application of JP2021-112002 filed before the Japan Patent Office on Jul. 6, 2021, the content of which is incorporated herein by reference.
While there has been described what is believed to be the preferred embodiment of the invention, those skilled in the art will recognize that other and further modifications may be made thereto without departing from the spirit of the invention, and it is intended to claim all such embodiments that fall within the true scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2021-112002 | Jul 2021 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2022/026746 | 7/5/2022 | WO |
