EP2790204A1 - Magnetron and microwave-using equipment - Google Patents
Magnetron and microwave-using equipment Download PDFInfo
- Publication number
- EP2790204A1 EP2790204A1 EP12855050.6A EP12855050A EP2790204A1 EP 2790204 A1 EP2790204 A1 EP 2790204A1 EP 12855050 A EP12855050 A EP 12855050A EP 2790204 A1 EP2790204 A1 EP 2790204A1
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- EP
- European Patent Office
- Prior art keywords
- magnetic yoke
- magnetron
- waveguide unit
- cut
- wave output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 52
- 239000002184 metal Substances 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 description 21
- 238000000034 method Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/12—Vessels; Containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
- H01J23/40—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
- H01J25/50—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field
- H01J25/52—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode
- H01J25/58—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field with an electron space having a shape that does not prevent any electron from moving completely around the cathode or guide electrode having a number of resonators; having a composite resonator, e.g. a helix
- H01J25/587—Multi-cavity magnetrons
Definitions
- the present invention relates to a magnetron that is suitable for use in microwave oscillation apparatus such as microwave-using apparatus.
- Magnetrons are roughly divided into a vacuum tube part and an exterior part.
- the vacuum tube part includes an anode cylinder whose inner wall surface is provided with a plurality of vanes extending radially, an input unit having a cathode structure disposed on the center axis of the anode cylinder, and a high-frequency wave output unit.
- the exterior part is includes permanent magnets, magnetic yokes which constitute a magnetic circuit, and a cooling unit.
- annular ribs 31 project from the inner surface of a first magnetic yoke 3 which is disposed on the high-frequency wave output side.
- a positioning plate 4 whose outer diameter matches the inner diameter of the annular ribs 31 so that the positioning plate 4 is just fitted in the annular ribs 31 and whose inner diameter matches the outer diameter of the high-frequency wave output unit so that the positioning plate 4 is just fitted with a high-frequency wave output unit is sandwiched between the first magnetic yoke 3 and a permanent magnet 122.
- the vacuum tube part and the exterior part are positioned with respect to and fixed to each other by the positioning plate 4 interposed in between by fitting the positioning plate 4 into the annular ribs 31 and with the high-frequency wave output unit 111.
- a cooling unit has a spiral structure and the positioning plate has baffle plates 41 so as to obstruct a cooling wind flowing through ineffective air passages.
- Patent Document 1 JP-A-S59-81834
- the rib projection height has a limit and assembling is possible even in a state that the positioning plate 4 is not fitted in the annular ribs 31.
- the positioning plate 4 has the baffle plates 41, directivity occurs at the time of assembling. As a result, assembling is complicated and a probability is high that the positioning plate 4 goes up onto the annular ribs 31.
- the ribs which are formed on the yoke have only the function of positioning and fixing the vacuum tube part and the exterior part with respect to each other by the positioning plate 4 interposed in between; no consideration is given to positioning with respect to a waveguide unit of a microwave-using apparatus or the like.
- the present invention has been made in the above circumstances, and an object of the present invention is to provide a magnetron high-frequency wave output unit can be positioned with respect to and fixed to its magnetic yoke and the waveguide unit of a microwave-using apparatus or the like reliably, without complicating its structure or assembling method.
- the invention provides a magnetron including: an anode cylinder including a high-frequency wave output unit; permanent magnets disposed on two opposite sides of the anode cylinder, respectively; and a magnetic yoke which houses therein the anode cylinder and the permanent magnets, wherein a portion, on a high-frequency wave output side, of the magnetic yoke is formed with a plurality of cut and raised parts, and a metal plate which matches the high-frequency wave output unit and the cut and raised parts is sandwiched between one of the permanent magnet and the magnetic yoke, whereby the anode cylinder and the magnetic yoke are positioned with respect to and fixed to each other.
- the high-frequency wave output unit of the magnetron can reliably be positioned with respect to and fixed to the magnetic yoke and a waveguide unit of a microwave-using apparatus or the like, without complicating its structure or assembling method.
- a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a cut and raised part which matches a hole formed by the cut and raised part in the magnetic yoke, and the cut and raised part of the waveguide unit is fitted in the hole of the magnetic yoke, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other.
- a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a projection which matches a hole formed by the cut and raised part in the magnetic yoke, and the projection of the waveguide unit is fitted in the hole of the magnetic yoke, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other.
- a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a hole which matches the cut and raised part of the magnetic yoke, and the cut and raised part of the magnetic yoke is fitted in the hole of the waveguide unit, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other.
- the height of the cut and raised parts can be set freely and hence deviation of the positioning metal plate can be suppressed.
- the positioning metal plate need not have directivity and is given a simple structure, which facilitates assembling.
- the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other because of the structure that the cut and raised parts formed in the magnetic yoke are fitted in the respective holes formed in the waveguide unit or the cut and raised parts or the projections formed in the waveguide unit of the microwave-using apparatus are fitted in the respective holes formed by the cut and raised parts in the magnetic yoke.
- the high-frequency output unit and the waveguide unit are positioned with respect to and fixed to each other, whereby discharge between the high-frequency output unit and the waveguide unit can be suppressed.
- the invention also provides a magnetron including: an anode cylinder including a high-frequency wave output unit; permanent magnets disposed on two opposite sides of the anode cylinder, respectively; and a magnetic yoke which houses therein the anode cylinder and the permanent magnets, wherein a portion, on a high-frequency wave output side, of the magnetic yoke is formed with a plurality of holes, a metal plate which matches the high-frequency wave output unit and the holes is sandwiched between one of the permanent magnet and the magnetic yoke, and positioning rods are inserted in the respective holes, whereby the anode cylinder and the magnetic yoke are positioned with respect to and fixed to each other.
- a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with holes which match the respective holes of the magnetic yoke, and the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other by the positioning rods.
- the positioning rods can be set freely and hence deviation between the positioning metal plate and the magnetic yoke can be suppressed.
- the positioning metal plate need not have directivity and is given a simple structure, which facilitates assembling.
- the metal plate, the magnetic yoke, and the waveguide unit are positioned with respect to and fixed to each other by the positioning rods.
- the high-frequency output unit and the waveguide unit are positioned with respect to and fixed to each other, whereby discharge between the high-frequency output unit and the waveguide unit can be suppressed.
- the microwave-using apparatus By applying the above-described magnetron to a microwave-using apparatus, the microwave-using apparatus with can be more stable and enhanced in performance.
- the magnetron and the microwave-using apparatus according to the invention make it possible to reliably positioning and fixing the high-frequency wave output unit of the magnetron with respect to and to a magnetic yoke of the magnetron and the waveguide unit of a microwave-using apparatus or the like, without complicating their structures or assembling methods.
- a first invention provides a magnetron including: an anode cylinder including a high-frequency wave output unit; permanent magnets disposed on two opposite sides of the anode cylinder, respectively; and a magnetic yoke which houses therein the anode cylinder and the permanent magnets, wherein a portion, on a high-frequency wave output side, of the magnetic yoke is formed with a plurality of cut and raised parts, and a metal plate which matches the high-frequency wave output unit and the cut and raised parts is sandwiched between one of the permanent magnet and the magnetic yoke, whereby the anode cylinder and the magnetic yoke are positioned with respect to and fixed to each other.
- the high-frequency wave output unit of the magnetron can reliably be positioned with respect to and fixed to the magnetic yoke and a waveguide unit of a microwave-using apparatus, without complicating its structure or assembling method, and the assembling can be facilitated by the simplified structure.
- a second invention provides the magnetron of the first invention, particularly, wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a cut and raised part which matches a hole formed by the cut and raised part in the magnetic yoke, and the cut and raised part of the waveguide unit is fitted in the hole of the magnetic yoke, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other.
- a third invention provides the magnetron of the first invention, particularly, wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a projection which matches a hole formed by the cut and raised part in the magnetic yoke, and the projection of the waveguide unit is fitted in the hole of the magnetic yoke, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other.
- a fourth invention provides the magnetron of the first invention, particularly, wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a hole which matches the cut and raised part of the magnetic yoke, and the cut and raised part of the magnetic yoke is fitted in the hole of the waveguide unit, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other.
- a fifth invention provides a magnetron including: an anode cylinder including a high-frequency wave output unit; permanent magnets disposed on two opposite sides of the anode cylinder, respectively; and a magnetic yoke which houses therein the anode cylinder and the permanent magnets, wherein a portion, on a high-frequency wave output side, of the magnetic yoke is formed with a plurality of holes, a metal plate which matches the high-frequency wave output unit and the holes is sandwiched between one of the permanent magnet and the magnetic yoke, and positioning rods are inserted in the respective holes, whereby the anode cylinder and the magnetic yoke are positioned with respect to and fixed to each other.
- the high-frequency wave output unit of the magnetron can reliably be positioned with respect to and fixed to the magnetic yoke and a waveguide unit of a microwave-using apparatus, without complicating its structure or assembling method, and the assembling can be facilitated by the simplified structure.
- a sixth invention provides the magnetron of the fifth invention, particularly, wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with holes which match the respective holes of the magnetic yoke, and the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other by the positioning rods.
- a seventh invention provides a microwave-using apparatus including the magnetron according to any one of the first to sixth inventions, which can be more stable and enhanced in performance
- Fig. 1 is a front view of a magnetron according to a first embodiment of the invention.
- Fig. 2 is a perspective view of a magnetic yoke and a metal plate of the magnetron according to the first embodiment of the invention.
- the magnetron 1 includes a vacuum tube part 11 and an exterior part 12.
- the vacuum tube part 11 includes an anode cylinder 112, an input unit (not shown), and a high-frequency wave output unit 111.
- the exterior part includes permanent magnets 122, magnetic yokes 121 which constitute a magnetic circuit, a cooling unit 123 including a plurality of cooling fins, and a filter unit 124 for supplying power to the input unit.
- the magnetic yokes 121 includes a first magnetic yoke 1211 disposed on the high-frequency wave output side and a second magnetic yoke 1212 disposed on the filter side which are connected to each other by caulking.
- a metal plate 125 is as thick as about 30% of the magnetic yokes 121, and is sandwiched between the permanent magnet 122 and the first magnetic yoke 1211.
- a gasket 126 is held and leakage of radio waves to be are output from the high-frequency wave output unit 111 is prevented.
- the first magnetic yoke 1211 is formed with four cut and raised parts 1213 having a height that is about three times the thickness of the magnetic yokes 121 at ineffective air passage portions of a cooling wind so as to project toward the inside of the magnetic yokes and to be arranged radially and symmetrically so as to have no directivity.
- the cut and raised parts 1213 are formed so as to just fit with the metal plate 125 whose outer diameter is approximately equal to the diameter of the circle that inscribes their end faces.
- the metal plate 125 is formed in such a manner that its inner diameter of the is approximately equal to the outer diameter of the high-frequency wave output unit 111 of the vacuum tube part 11 so that the metal plate 125 just fits with the high-frequency wave output unit 111.
- the vacuum tube part 11 is positioned with respect to the first magnetic yoke 1211 with the metal plate 125 interposed in between because an inside portion (in the radial direction) of the metal plate 125 is fitted with the high-frequency wave output unit 111 and an outside portion (in the radial direction) of the metal plate 125 is fitted in the circle that inscribes the end faces of the cut and raised parts 1213 of the first magnetic yoke 1211.
- the first magnetic yoke 1211 has holes 1214 as a result of the formation of the respective cut and raised parts 1213.
- Fig. 3 is a partially sectional view of a magnetron with a waveguide unit according to the first embodiment of the invention.
- a portion, to which the magnetron 1 is to be attached, of a waveguide unit 2 is formed with four cut and raised parts 21 having a height that is about two times the thickness of the magnetic yokes 121 at such positions as to fit into the respective holes 1214 formed by the cut and raised parts 1213 of the first magnetic yoke 1211 so as to project toward the outside of the waveguide unit 2.
- the cut and raised parts 21 of the waveguide unit 2 are partially fitted in the respective holes 1214 formed by the cut and raised parts 1213 of the first magnetic yoke 1211.
- the magnetron 1 and the waveguide unit 2 are positioned with respect to each other and the first magnetic yoke 1211 and the waveguide unit 2 are fixed to each other with screws.
- the metal plate 125 has no directivity and enables simple assembling. Since the height of the cut and raised parts 1213 is sufficiently greater than the thickness of the metal plate 125, the metal plate 125 never goes up onto the cut and raised parts 1213.
- the vacuum tube part 11 of the magnetron 1 is positioned with respect to the first magnetic yoke 1211 with the metal plate 125 interposed in between, positional variations of members involved can be reduced at the time of assembling and deviations can be suppressed when the magnetron 1 is subjected to vibration or impact.
- the magnetron 1 is positioned with respect to and fixed to the waveguide unit 2, deviations of the high-frequency wave output unit 111 with respect to the waveguide unit 2 can be suppressed to a large extent, whereby the occurrence of discharge between the high-frequency wave output unit 111 and the waveguide unit 2 can be suppressed and radio waves can be guided reliably.
- cut and raised parts 1213 are formed at ineffective air passage portions of a cooling wind, they also serve as baffle plates, making it possible to apply a cooling wind to the cooling fins efficiently.
- an even number of cut and raised parts be arranged symmetrically so as not to have directivity.
- the number, size, positions, shape, directions, and angle of the cut and raised parts are not restricted at all as long as they enable positioning with respect to the metal plate and the waveguide unit.
- the cut and raised parts for positioning of the metal plate and those for positioning of the waveguide unit may be formed separately.
- the metal plate may have any structure as long as it can be positioned with respect to the yokes.
- Fig. 4 is a perspective view of a magnetic yoke of a magnetron according to a second embodiment of the invention.
- Fig. 5 is a partially sectional view of a magnetron with a waveguide unit according to the same embodiment.
- a first magnetic yoke 1215 is formed with four first cut and raised parts 1216 having a height that is about three times the thickness of the magnetic yokes at ineffective air passage portions of a cooling wind so as to project toward the inside of the magnetic yokes and to be arranged radially and symmetrically so as to have no directivity.
- the first cut and raised parts 1216 are formed so as to just fit with the metal plate 125 whose outer diameter is approximately equal to the diameter of the circle that inscribes their end faces.
- the first magnetic yoke 1215 is formed with two second cut and raised parts 1217 having a height that is about two times the thickness of the magnetic yokes so as to project toward the outside of the magnetic yokes and to be arranged radially and symmetrically so as to have no directivity.
- the first magnetic yoke 1215 has holes 1214 as a result of the formation of the respective first cut and raised parts 1216.
- the magnetron is configured in the same manner as in the first embodiment except for the first magnetic yoke 1215.
- the vacuum tube part 11 is positioned with respect to the first magnetic yoke 1215 with the metal plate 125 interposed in between because an inside portion (in the radial direction) of the metal plate 125 is fitted with the high-frequency wave output unit 111 and an outside portion (in the radial direction) of the metal plate 125 is fitted in the circle that inscribes the end faces of the cut and raised parts 1215 of the first magnetic yoke 1215.
- a portion, to which the magnetron 1 is to be attached, of the waveguide unit 2 is formed with first holes 23 at such positions as to be fitted with the respective second cut and raised parts 1217 of the first magnetic yoke 1215.
- the portion, to which the magnetron 1 is to be attached, of the waveguide unit 2 is formed with second holes 24 at the same positions as the respective holes 1214 formed by the first cut and raised parts 1216 of the first magnetic yoke 1215.
- the second cut and raised parts 1217 of the first magnetic yoke 1215 are partially fitted in the respective first holes 23 of the waveguide unit 2.
- the magnetron 1 and the waveguide unit 2 are positioned with respect to each other and the first magnetic yoke 1215 and the waveguide unit 2 are fixed to each other with screws.
- the metal plate 125 has no directivity and enables simple assembling.
- the metal plate 125 Since the height of the first cut and raised parts 1216 is sufficiently greater than the thickness of the metal plate 125, the metal plate 125 never goes up onto the first cut and raised parts 1216.
- the vacuum tube part 11 of the magnetron 1 is positioned with respect to the first magnetic yoke 1215 with the metal plate 125 interposed in between, positional variations of members involved can be reduced at the time of assembling and deviations can be suppressed when the magnetron 1 is subjected to vibration or impact.
- the magnetron 1 is positioned with respect to and fixed to the waveguide unit 2, deviations of the high-frequency wave output unit 111 with respect to the waveguide unit 2 can be suppressed to a large extent, whereby the occurrence of discharge between the high-frequency wave output unit 111 and the waveguide unit 2 can be suppressed and radio waves can be guided reliably.
- first cut and raised parts 1216 are formed at ineffective air passage portions of a cooling wind, they also serve as baffle plates, making it possible to apply a cooling wind to the cooling fins efficiently.
- an even number of cut and raised parts be arranged symmetrically so as not to have directivity.
- the number, size, positions, shape, directions, and angle of the cut and raised parts are not restricted at all as long as they enable positioning with respect to the metal plate and the waveguide unit.
- the metal plate may have such a simple structure as not to have directivity, it may have any structure as long as it can be positioned with respect to the yokes.
- the waveguide unit 2 be formed with holes other than those for the relative positioning.
- the number, positions, and shape of the holes are not restricted at all as long as they make it possible to position the waveguide unit with respect to the magnetron.
- Fig. 6 is a front view of a magnetron according to a third embodiment of the invention.
- Fig. 7 is a perspective view of a rod of the magnetron according to the third embodiment of the invention.
- a first magnetic yoke 1218 is formed with four holes 1219 approximately on the outer circumference of the metal plate 125 at ineffective air passage portions of a cooling wind so as to be arranged radially and symmetrically so as to have no directivity.
- Rods 127 are inserted through the four respective holes 1219 of the first magnetic yoke 1218 so as to project by approximately the same length inward and outward.
- each rod 127 has a semicylindrical shape and has a length that is about five times the thickness of the magnetic yokes.
- the rods 127 are press-fitted in the respective holes 1219 of the first magnetic yoke 1218.
- the rods 127 are made of aluminum.
- the metal plate 125 is fitted in the circle that inscribes the circular arcs of the four rods 127, and is thereby positioned with respect to the first magnetic yoke 1218.
- the magnetron is configured in the same manner as in the first embodiment except for the first magnetic yoke 1218 and the rods 127.
- the vacuum tube part 11 is positioned with respect to the first magnetic yoke 1218 with the metal plate 125 interposed in between because an inside portion (in the radial direction) of the metal plate 125 is fitted with the high-frequency wave output unit 111 and an outside portion (in the radial direction) of the metal plate 125 is fitted in the circle that inscribes the circular arcs of the rods 127 which are press-fitted in the first magnetic yoke 1218.
- Fig. 8 is a partially sectional view of a magnetron with a waveguide unit according to the third embodiment of the invention.
- a portion, to which the magnetron 1 is to be attached, of the waveguide unit 2 is formed with holes 25 at such positions as to fit with the respective rods 127 which are press-fitted in the first magnetic yoke 1218.
- the rods 127 are fitted in the respective holes 25 of the waveguide unit 2.
- the magnetron 1 and the waveguide unit 2 are positioned with respect to each other and the first magnetic yoke 1215 and the waveguide unit 2 are fixed to each other with screws.
- the metal plate 125 has no directivity and enables simple assembling. Since the height of the rods 127 is sufficiently greater than the thickness of the metal plate 125, the metal plate 125 never goes up onto the rods 127.
- the rods 127 are not magnetic, the magnetic loss can be suppressed. Since the vacuum tube part 11 of the magnetron 1 is positioned with respect to the first magnetic yoke 1218 via the metal plate 125 and the rods 127, positional variations of members involved can be reduced at the time of assembling and deviations can be suppressed when the magnetron 1 is subjected to vibration or impact.
- the magnetron 1 is positioned with respect to and fixed to the waveguide unit 2, deviations of the high-frequency wave output unit 111 with respect to the waveguide unit 2 can be suppressed to a large extent, whereby the occurrence of discharge between the high-frequency wave output unit 111 and the waveguide unit 2 can be suppressed and radio waves can be guided reliably.
- rods 127 project at ineffective air passage portions of a cooling wind, they also serve as baffle plates, making it possible to apply a cooling wind to the cooling fins efficiently.
- the rods 127 have a semicylindrical shape, after hitting the rods 127 parts of a cooling wind flow through the holes defined by the holes 1219 and the rods 127 and flow into the waveguide unit through holes defined by the holes 25 of the waveguide unit 2 and the rods 127, to produce a convectional air flow in the waveguide unit. It is therefore expected that the occurrence of discharge between the high-frequency wave output unit 111 and the waveguide unit 2 can be suppressed further.
- rods be arranged symmetrically so as not to have directivity.
- the number, size, positions, shape, and directions of the rods are not restricted at all as long as they enable positioning with respect to the metal plate and the waveguide unit.
- the rods 127 need not be press-fitted as long as they enable positioning with respect to the metal plate and the waveguide unit.
- the metal plate may have such a simple structure as not to have directivity, it may have any structure as long as it can be positioned with respect to the yokes.
- the rods be made of a non-magnetic material.
- the rods may be made of any material as long as they enable positioning with respect to the metal plate and the waveguide unit.
- the magnetron and the microwave-using apparatus according to the invention make it possible to reliably positioning and fixing the high-frequency wave output unit of the magnetron with respect to and to a magnetic yoke of the magnetron and the waveguide unit of a microwave-using apparatus or the like, to suppress discharge between the high-frequency wave output unit and the waveguide unit, to guide radio waves reliably, without complicating their structures or assembling methods.
- they can be applied to or used as microwave-using apparatus such as microwave ovens.
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Abstract
Description
- The present invention relates to a magnetron that is suitable for use in microwave oscillation apparatus such as microwave-using apparatus.
- Magnetrons are roughly divided into a vacuum tube part and an exterior part. The vacuum tube part includes an anode cylinder whose inner wall surface is provided with a plurality of vanes extending radially, an input unit having a cathode structure disposed on the center axis of the anode cylinder, and a high-frequency wave output unit. The exterior part is includes permanent magnets, magnetic yokes which constitute a magnetic circuit, and a cooling unit.
- There are various methods for positioning the vacuum tube part and the exterior part with respect to each other. For example, in the magnetron disclosed in
Patent Document 1, as shown inFig. 10 ,annular ribs 31 project from the inner surface of a firstmagnetic yoke 3 which is disposed on the high-frequency wave output side. As shown inFig. 9 , apositioning plate 4 whose outer diameter matches the inner diameter of theannular ribs 31 so that thepositioning plate 4 is just fitted in theannular ribs 31 and whose inner diameter matches the outer diameter of the high-frequency wave output unit so that thepositioning plate 4 is just fitted with a high-frequency wave output unit is sandwiched between the firstmagnetic yoke 3 and apermanent magnet 122. The vacuum tube part and the exterior part are positioned with respect to and fixed to each other by thepositioning plate 4 interposed in between by fitting thepositioning plate 4 into theannular ribs 31 and with the high-frequencywave output unit 111. - In
Patent Document 1, shown inFig. 9 , a cooling unit has a spiral structure and the positioning plate hasbaffle plates 41 so as to obstruct a cooling wind flowing through ineffective air passages. - Patent Document 1:
JP-A-S59-81834 - However, in the above conventional configuration, since the yoke is formed with the ribs, the rib projection height has a limit and assembling is possible even in a state that the
positioning plate 4 is not fitted in theannular ribs 31. - Furthermore, with the structure that the
positioning plate 4 has thebaffle plates 41, directivity occurs at the time of assembling. As a result, assembling is complicated and a probability is high that thepositioning plate 4 goes up onto theannular ribs 31. - Still further, the ribs which are formed on the yoke have only the function of positioning and fixing the vacuum tube part and the exterior part with respect to each other by the
positioning plate 4 interposed in between; no consideration is given to positioning with respect to a waveguide unit of a microwave-using apparatus or the like. - Therefore, where only general attachment screws are used, the position of the magnetron relative to the waveguide unit varies, raising a problem that discharge may occur between the high-frequency wave output unit and the waveguide unit.
- The present invention has been made in the above circumstances, and an object of the present invention is to provide a magnetron high-frequency wave output unit can be positioned with respect to and fixed to its magnetic yoke and the waveguide unit of a microwave-using apparatus or the like reliably, without complicating its structure or assembling method.
- To solve the above problems in the related art, the invention provides a magnetron including: an anode cylinder including a high-frequency wave output unit; permanent magnets disposed on two opposite sides of the anode cylinder, respectively; and a magnetic yoke which houses therein the anode cylinder and the permanent magnets, wherein a portion, on a high-frequency wave output side, of the magnetic yoke is formed with a plurality of cut and raised parts, and a metal plate which matches the high-frequency wave output unit and the cut and raised parts is sandwiched between one of the permanent magnet and the magnetic yoke, whereby the anode cylinder and the magnetic yoke are positioned with respect to and fixed to each other.
- With this configuration, the high-frequency wave output unit of the magnetron can reliably be positioned with respect to and fixed to the magnetic yoke and a waveguide unit of a microwave-using apparatus or the like, without complicating its structure or assembling method.
- In the above magnetron, a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a cut and raised part which matches a hole formed by the cut and raised part in the magnetic yoke, and the cut and raised part of the waveguide unit is fitted in the hole of the magnetic yoke, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other.
- In the above magnetron, a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a projection which matches a hole formed by the cut and raised part in the magnetic yoke, and the projection of the waveguide unit is fitted in the hole of the magnetic yoke, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other.
- In the above magnetron, a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a hole which matches the cut and raised part of the magnetic yoke, and the cut and raised part of the magnetic yoke is fitted in the hole of the waveguide unit, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other.
- With the above structures, the height of the cut and raised parts can be set freely and hence deviation of the positioning metal plate can be suppressed.
- Since the plurality of cut and raised parts are formed, the positioning metal plate need not have directivity and is given a simple structure, which facilitates assembling.
- The magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other because of the structure that the cut and raised parts formed in the magnetic yoke are fitted in the respective holes formed in the waveguide unit or the cut and raised parts or the projections formed in the waveguide unit of the microwave-using apparatus are fitted in the respective holes formed by the cut and raised parts in the magnetic yoke. As a result, the high-frequency output unit and the waveguide unit are positioned with respect to and fixed to each other, whereby discharge between the high-frequency output unit and the waveguide unit can be suppressed.
- The invention also provides a magnetron including: an anode cylinder including a high-frequency wave output unit; permanent magnets disposed on two opposite sides of the anode cylinder, respectively; and a magnetic yoke which houses therein the anode cylinder and the permanent magnets, wherein a portion, on a high-frequency wave output side, of the magnetic yoke is formed with a plurality of holes, a metal plate which matches the high-frequency wave output unit and the holes is sandwiched between one of the permanent magnet and the magnetic yoke, and positioning rods are inserted in the respective holes, whereby the anode cylinder and the magnetic yoke are positioned with respect to and fixed to each other.
- In the above magnetron, a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with holes which match the respective holes of the magnetic yoke, and the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other by the positioning rods.
- With the above structures, the positioning rods can be set freely and hence deviation between the positioning metal plate and the magnetic yoke can be suppressed.
- Since the positioning rods are inserted in the respective holes, the positioning metal plate need not have directivity and is given a simple structure, which facilitates assembling.
- The metal plate, the magnetic yoke, and the waveguide unit are positioned with respect to and fixed to each other by the positioning rods. As a result, the high-frequency output unit and the waveguide unit are positioned with respect to and fixed to each other, whereby discharge between the high-frequency output unit and the waveguide unit can be suppressed.
- By applying the above-described magnetron to a microwave-using apparatus, the microwave-using apparatus with can be more stable and enhanced in performance.
- The magnetron and the microwave-using apparatus according to the invention make it possible to reliably positioning and fixing the high-frequency wave output unit of the magnetron with respect to and to a magnetic yoke of the magnetron and the waveguide unit of a microwave-using apparatus or the like, without complicating their structures or assembling methods.
-
-
Fig. 1 is a front view of a magnetron according to a first embodiment of the present invention. -
Fig. 2 is a perspective view of a magnetic yoke and a metal plate of the magnetron according to the first embodiment of the invention. -
Fig. 3 is a partially sectional view of a magnetron with a waveguide unit according to the first embodiment of the invention. -
Fig. 4 is a perspective view of a magnetic yoke of a magnetron according to a second embodiment of the invention. -
Fig. 5 is a partially sectional view of a magnetron with a waveguide unit according to the second embodiment of the invention. -
Fig. 6 is a front view of a magnetron according to a third embodiment of the invention. -
Fig. 7 is a perspective view of a rod of the magnetron according to the third embodiment of the invention. -
Fig. 8 is a partially sectional view of a magnetron with a waveguide unit according to the third embodiment of the invention. -
Fig. 9 is a front view of a conventional magnetron. -
Fig. 10 is a perspective view of a magnetic yoke and a positioning plate of the conventional magnetron. - A first invention provides a magnetron including: an anode cylinder including a high-frequency wave output unit; permanent magnets disposed on two opposite sides of the anode cylinder, respectively; and a magnetic yoke which houses therein the anode cylinder and the permanent magnets, wherein a portion, on a high-frequency wave output side, of the magnetic yoke is formed with a plurality of cut and raised parts, and a metal plate which matches the high-frequency wave output unit and the cut and raised parts is sandwiched between one of the permanent magnet and the magnetic yoke, whereby the anode cylinder and the magnetic yoke are positioned with respect to and fixed to each other. With this configuration, the high-frequency wave output unit of the magnetron can reliably be positioned with respect to and fixed to the magnetic yoke and a waveguide unit of a microwave-using apparatus, without complicating its structure or assembling method, and the assembling can be facilitated by the simplified structure.
- A second invention provides the magnetron of the first invention, particularly, wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a cut and raised part which matches a hole formed by the cut and raised part in the magnetic yoke, and the cut and raised part of the waveguide unit is fitted in the hole of the magnetic yoke, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other. With this configuration, a variation in a relative position of the high-frequency wave output unit and the waveguide unit can be suppressed, and occurrence of discharge between the high-frequency wave output unit and the waveguide unit can be suppressed.
- A third invention provides the magnetron of the first invention, particularly, wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a projection which matches a hole formed by the cut and raised part in the magnetic yoke, and the projection of the waveguide unit is fitted in the hole of the magnetic yoke, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other. With this configuration, a variation in a relative position of the high-frequency wave output unit and the waveguide unit can be suppressed, and occurrence of discharge between the high-frequency wave output unit and the waveguide unit can be suppressed.
- A fourth invention provides the magnetron of the first invention, particularly, wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a hole which matches the cut and raised part of the magnetic yoke, and the cut and raised part of the magnetic yoke is fitted in the hole of the waveguide unit, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other. With this configuration, a variation in a relative position of the high-frequency wave output unit and the waveguide unit can be suppressed, and occurrence of discharge between the high-frequency wave output unit and the waveguide unit can be suppressed.
- A fifth invention provides a magnetron including: an anode cylinder including a high-frequency wave output unit; permanent magnets disposed on two opposite sides of the anode cylinder, respectively; and a magnetic yoke which houses therein the anode cylinder and the permanent magnets, wherein a portion, on a high-frequency wave output side, of the magnetic yoke is formed with a plurality of holes, a metal plate which matches the high-frequency wave output unit and the holes is sandwiched between one of the permanent magnet and the magnetic yoke, and positioning rods are inserted in the respective holes, whereby the anode cylinder and the magnetic yoke are positioned with respect to and fixed to each other. With this configuration, the high-frequency wave output unit of the magnetron can reliably be positioned with respect to and fixed to the magnetic yoke and a waveguide unit of a microwave-using apparatus, without complicating its structure or assembling method, and the assembling can be facilitated by the simplified structure.
- A sixth invention provides the magnetron of the fifth invention, particularly, wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with holes which match the respective holes of the magnetic yoke, and the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other by the positioning rods. With this configuration, a variation in a relative position of the high-frequency wave output unit and the waveguide unit can be suppressed, and occurrence of discharge between the high-frequency wave output unit and the waveguide unit can be suppressed.
- A seventh invention provides a microwave-using apparatus including the magnetron according to any one of the first to sixth inventions, which can be more stable and enhanced in performance
- Embodiments of the invention will be hereinafter described with reference to the drawings. The embodiments should not be construed as restricting the invention.
-
Fig. 1 is a front view of a magnetron according to a first embodiment of the invention.Fig. 2 is a perspective view of a magnetic yoke and a metal plate of the magnetron according to the first embodiment of the invention. - As shown in
Fig. 1 , themagnetron 1 includes avacuum tube part 11 and anexterior part 12. Thevacuum tube part 11 includes ananode cylinder 112, an input unit (not shown), and a high-frequencywave output unit 111. The exterior part includespermanent magnets 122,magnetic yokes 121 which constitute a magnetic circuit, acooling unit 123 including a plurality of cooling fins, and afilter unit 124 for supplying power to the input unit. - The
magnetic yokes 121 includes a firstmagnetic yoke 1211 disposed on the high-frequency wave output side and a secondmagnetic yoke 1212 disposed on the filter side which are connected to each other by caulking. - A
metal plate 125 is as thick as about 30% of themagnetic yokes 121, and is sandwiched between thepermanent magnet 122 and the firstmagnetic yoke 1211. Agasket 126 is held and leakage of radio waves to be are output from the high-frequencywave output unit 111 is prevented. - As shown in
Fig. 2 , the firstmagnetic yoke 1211 is formed with four cut and raisedparts 1213 having a height that is about three times the thickness of themagnetic yokes 121 at ineffective air passage portions of a cooling wind so as to project toward the inside of the magnetic yokes and to be arranged radially and symmetrically so as to have no directivity. The cut and raisedparts 1213 are formed so as to just fit with themetal plate 125 whose outer diameter is approximately equal to the diameter of the circle that inscribes their end faces. - The
metal plate 125 is formed in such a manner that its inner diameter of the is approximately equal to the outer diameter of the high-frequencywave output unit 111 of thevacuum tube part 11 so that themetal plate 125 just fits with the high-frequencywave output unit 111. - With the above structures, the
vacuum tube part 11 is positioned with respect to the firstmagnetic yoke 1211 with themetal plate 125 interposed in between because an inside portion (in the radial direction) of themetal plate 125 is fitted with the high-frequencywave output unit 111 and an outside portion (in the radial direction) of themetal plate 125 is fitted in the circle that inscribes the end faces of the cut and raisedparts 1213 of the firstmagnetic yoke 1211. - The first
magnetic yoke 1211 hasholes 1214 as a result of the formation of the respective cut and raisedparts 1213. -
Fig. 3 is a partially sectional view of a magnetron with a waveguide unit according to the first embodiment of the invention. - As shown in
Fig. 3 , a portion, to which themagnetron 1 is to be attached, of awaveguide unit 2 is formed with four cut and raisedparts 21 having a height that is about two times the thickness of themagnetic yokes 121 at such positions as to fit into therespective holes 1214 formed by the cut and raisedparts 1213 of the firstmagnetic yoke 1211 so as to project toward the outside of thewaveguide unit 2. The cut and raisedparts 21 of thewaveguide unit 2 are partially fitted in therespective holes 1214 formed by the cut and raisedparts 1213 of the firstmagnetic yoke 1211. - With this structure, the
magnetron 1 and thewaveguide unit 2 are positioned with respect to each other and the firstmagnetic yoke 1211 and thewaveguide unit 2 are fixed to each other with screws. - How the above-configured magnetron works will be described below.
- First, shaped like a disc, the
metal plate 125 has no directivity and enables simple assembling. Since the height of the cut and raisedparts 1213 is sufficiently greater than the thickness of themetal plate 125, themetal plate 125 never goes up onto the cut and raisedparts 1213. - Since the
vacuum tube part 11 of themagnetron 1 is positioned with respect to the firstmagnetic yoke 1211 with themetal plate 125 interposed in between, positional variations of members involved can be reduced at the time of assembling and deviations can be suppressed when themagnetron 1 is subjected to vibration or impact. - Furthermore, since the
magnetron 1 is positioned with respect to and fixed to thewaveguide unit 2, deviations of the high-frequencywave output unit 111 with respect to thewaveguide unit 2 can be suppressed to a large extent, whereby the occurrence of discharge between the high-frequencywave output unit 111 and thewaveguide unit 2 can be suppressed and radio waves can be guided reliably. - Still further, since the cut and raised
parts 1213 are formed at ineffective air passage portions of a cooling wind, they also serve as baffle plates, making it possible to apply a cooling wind to the cooling fins efficiently. - After hitting the cut and raised
parts 1213, parts of a cooling wind flow through theholes 1214 formed by the cut and raisedparts 1213 and flow into the waveguide unit through theholes 22 formed by the cut and raisedparts 21 of thewaveguide unit 2, to produce a convectional air flow in the waveguide unit. It is therefore expected that the occurrence of discharge between the high-frequencywave output unit 111 and thewaveguide unit 2 can be suppressed further. - It is preferable that an even number of cut and raised parts be arranged symmetrically so as not to have directivity. However, the number, size, positions, shape, directions, and angle of the cut and raised parts are not restricted at all as long as they enable positioning with respect to the metal plate and the waveguide unit.
- The cut and raised parts for positioning of the metal plate and those for positioning of the waveguide unit may be formed separately.
- Although it is preferable that the metal plate have such a simple structure as not to have directivity, the metal plate may have any structure as long as it can be positioned with respect to the yokes.
-
Fig. 4 is a perspective view of a magnetic yoke of a magnetron according to a second embodiment of the invention.Fig. 5 is a partially sectional view of a magnetron with a waveguide unit according to the same embodiment. - As shown in
Fig. 4 , a firstmagnetic yoke 1215 is formed with four first cut and raisedparts 1216 having a height that is about three times the thickness of the magnetic yokes at ineffective air passage portions of a cooling wind so as to project toward the inside of the magnetic yokes and to be arranged radially and symmetrically so as to have no directivity. The first cut and raisedparts 1216 are formed so as to just fit with themetal plate 125 whose outer diameter is approximately equal to the diameter of the circle that inscribes their end faces. - The first
magnetic yoke 1215 is formed with two second cut and raisedparts 1217 having a height that is about two times the thickness of the magnetic yokes so as to project toward the outside of the magnetic yokes and to be arranged radially and symmetrically so as to have no directivity. - The first
magnetic yoke 1215 hasholes 1214 as a result of the formation of the respective first cut and raisedparts 1216. - The magnetron is configured in the same manner as in the first embodiment except for the first
magnetic yoke 1215. - With the above structures, the
vacuum tube part 11 is positioned with respect to the firstmagnetic yoke 1215 with themetal plate 125 interposed in between because an inside portion (in the radial direction) of themetal plate 125 is fitted with the high-frequencywave output unit 111 and an outside portion (in the radial direction) of themetal plate 125 is fitted in the circle that inscribes the end faces of the cut and raisedparts 1215 of the firstmagnetic yoke 1215. - As shown in
Fig. 5 , a portion, to which themagnetron 1 is to be attached, of thewaveguide unit 2 is formed withfirst holes 23 at such positions as to be fitted with the respective second cut and raisedparts 1217 of the firstmagnetic yoke 1215. - Furthermore, the portion, to which the
magnetron 1 is to be attached, of thewaveguide unit 2 is formed withsecond holes 24 at the same positions as therespective holes 1214 formed by the first cut and raisedparts 1216 of the firstmagnetic yoke 1215. The second cut and raisedparts 1217 of the firstmagnetic yoke 1215 are partially fitted in the respectivefirst holes 23 of thewaveguide unit 2. - With this structure, the
magnetron 1 and thewaveguide unit 2 are positioned with respect to each other and the firstmagnetic yoke 1215 and thewaveguide unit 2 are fixed to each other with screws. - How the above-configured magnetron works will be described below.
- First, shaped like a disc, the
metal plate 125 has no directivity and enables simple assembling. - Since the height of the first cut and raised
parts 1216 is sufficiently greater than the thickness of themetal plate 125, themetal plate 125 never goes up onto the first cut and raisedparts 1216. - Since the
vacuum tube part 11 of themagnetron 1 is positioned with respect to the firstmagnetic yoke 1215 with themetal plate 125 interposed in between, positional variations of members involved can be reduced at the time of assembling and deviations can be suppressed when themagnetron 1 is subjected to vibration or impact. - Furthermore, since the
magnetron 1 is positioned with respect to and fixed to thewaveguide unit 2, deviations of the high-frequencywave output unit 111 with respect to thewaveguide unit 2 can be suppressed to a large extent, whereby the occurrence of discharge between the high-frequencywave output unit 111 and thewaveguide unit 2 can be suppressed and radio waves can be guided reliably. - Still further, since the first cut and raised
parts 1216 are formed at ineffective air passage portions of a cooling wind, they also serve as baffle plates, making it possible to apply a cooling wind to the cooling fins efficiently. - After hitting the first cut and raised
parts 1216, parts of a cooling wind flow through theholes 1214 formed by the first cut and raisedparts 1216 and flow into the waveguide unit through thesecond holes 24 of thewaveguide unit 2, to produce a convectional air flow in the waveguide unit. It is therefore expected that the occurrence of discharge between the high-frequencywave output unit 111 and thewaveguide unit 2 can be suppressed further. - It is preferable that an even number of cut and raised parts be arranged symmetrically so as not to have directivity. However, the number, size, positions, shape, directions, and angle of the cut and raised parts are not restricted at all as long as they enable positioning with respect to the metal plate and the waveguide unit.
- Although it is preferable that the metal plate have such a simple structure as not to have directivity, it may have any structure as long as it can be positioned with respect to the yokes.
- It is preferable that for the purpose of air convention the
waveguide unit 2 be formed with holes other than those for the relative positioning. However, the number, positions, and shape of the holes are not restricted at all as long as they make it possible to position the waveguide unit with respect to the magnetron. -
Fig. 6 is a front view of a magnetron according to a third embodiment of the invention.Fig. 7 is a perspective view of a rod of the magnetron according to the third embodiment of the invention. - As shown in
Fig. 6 , a firstmagnetic yoke 1218 is formed with fourholes 1219 approximately on the outer circumference of themetal plate 125 at ineffective air passage portions of a cooling wind so as to be arranged radially and symmetrically so as to have no directivity. -
Rods 127 are inserted through the fourrespective holes 1219 of the firstmagnetic yoke 1218 so as to project by approximately the same length inward and outward. - As shown in
Fig. 7 , eachrod 127 has a semicylindrical shape and has a length that is about five times the thickness of the magnetic yokes. Therods 127 are press-fitted in therespective holes 1219 of the firstmagnetic yoke 1218. - The
rods 127 are made of aluminum. - The
metal plate 125 is fitted in the circle that inscribes the circular arcs of the fourrods 127, and is thereby positioned with respect to the firstmagnetic yoke 1218. - The magnetron is configured in the same manner as in the first embodiment except for the first
magnetic yoke 1218 and therods 127. - With the above structures, the
vacuum tube part 11 is positioned with respect to the firstmagnetic yoke 1218 with themetal plate 125 interposed in between because an inside portion (in the radial direction) of themetal plate 125 is fitted with the high-frequencywave output unit 111 and an outside portion (in the radial direction) of themetal plate 125 is fitted in the circle that inscribes the circular arcs of therods 127 which are press-fitted in the firstmagnetic yoke 1218. -
Fig. 8 is a partially sectional view of a magnetron with a waveguide unit according to the third embodiment of the invention. - As shown in
Fig. 8 , a portion, to which themagnetron 1 is to be attached, of thewaveguide unit 2 is formed withholes 25 at such positions as to fit with therespective rods 127 which are press-fitted in the firstmagnetic yoke 1218. Therods 127 are fitted in therespective holes 25 of thewaveguide unit 2. - With this structure, the
magnetron 1 and thewaveguide unit 2 are positioned with respect to each other and the firstmagnetic yoke 1215 and thewaveguide unit 2 are fixed to each other with screws. - How the above-configured magnetron works will be described below.
- First, shaped like a disc, the
metal plate 125 has no directivity and enables simple assembling. Since the height of therods 127 is sufficiently greater than the thickness of themetal plate 125, themetal plate 125 never goes up onto therods 127. - Since the
rods 127 are not magnetic, the magnetic loss can be suppressed. Since thevacuum tube part 11 of themagnetron 1 is positioned with respect to the firstmagnetic yoke 1218 via themetal plate 125 and therods 127, positional variations of members involved can be reduced at the time of assembling and deviations can be suppressed when themagnetron 1 is subjected to vibration or impact. - Furthermore, since the
magnetron 1 is positioned with respect to and fixed to thewaveguide unit 2, deviations of the high-frequencywave output unit 111 with respect to thewaveguide unit 2 can be suppressed to a large extent, whereby the occurrence of discharge between the high-frequencywave output unit 111 and thewaveguide unit 2 can be suppressed and radio waves can be guided reliably. - Still further, since the
rods 127 project at ineffective air passage portions of a cooling wind, they also serve as baffle plates, making it possible to apply a cooling wind to the cooling fins efficiently. - What is more, since the
rods 127 have a semicylindrical shape, after hitting therods 127 parts of a cooling wind flow through the holes defined by theholes 1219 and therods 127 and flow into the waveguide unit through holes defined by theholes 25 of thewaveguide unit 2 and therods 127, to produce a convectional air flow in the waveguide unit. It is therefore expected that the occurrence of discharge between the high-frequencywave output unit 111 and thewaveguide unit 2 can be suppressed further. - It is preferable that an even number of rods be arranged symmetrically so as not to have directivity. However, the number, size, positions, shape, and directions of the rods are not restricted at all as long as they enable positioning with respect to the metal plate and the waveguide unit.
- The
rods 127 need not be press-fitted as long as they enable positioning with respect to the metal plate and the waveguide unit. - Although it is preferable that the metal plate have such a simple structure as not to have directivity, it may have any structure as long as it can be positioned with respect to the yokes.
- To suppress the magnetic loss, it is preferable that the rods be made of a non-magnetic material. However, the rods may be made of any material as long as they enable positioning with respect to the metal plate and the waveguide unit.
- Although the invention has been described in detail by referring to the particular embodiments, it is apparent to those skilled in the art that various changes and modifications are possible without departing from the spirit and scope of the invention.
- The present application is based on Japanese Patent Application No.
2011-266565 filed on December 6, 2011 - The magnetron and the microwave-using apparatus according to the invention make it possible to reliably positioning and fixing the high-frequency wave output unit of the magnetron with respect to and to a magnetic yoke of the magnetron and the waveguide unit of a microwave-using apparatus or the like, to suppress discharge between the high-frequency wave output unit and the waveguide unit, to guide radio waves reliably, without complicating their structures or assembling methods. As such, they can be applied to or used as microwave-using apparatus such as microwave ovens.
-
- 1:
- Magnetron
- 11:
- Vacuum Tube Part
- 111:
- High-Frequency Wave Output Unit
- 112:
- Anode Cylinder
- 12:
- Exterior Part
- 121:
- Magnetic Yokes
- 1211:
- First magnetic Yoke
- 1212:
- Second magnetic Yoke
- 1213:
- Cut and raised part
- 1214:
- Hole
- 1215:
- First magnetic yoke
- 1216:
- First Cut and Raised Part
- 1217:
- Second Cut and Raised Part
- 1218:
- First magnetic yoke
- 1219:
- Hole
- 122:
- Permanent magnet
- 123:
- Cooling Unit
- 124:
- Filter Unit
- 125:
- Metal Plate
- 126:
- Gasket
- 127:
- Rod
- 2:
- Waveguide Unit
- 21:
- Cut and Raised Part
- 22:
- Hole
- 23:
- First Hole
- 24:
- Second Hole
- 25:
- Hole
- 3:
- First Magnetic Yoke
- 31:
- Annular Rib
- 4:
- Positioning Plate
- 41:
- Baffle Plate
Claims (7)
- A magnetron comprising:an anode cylinder comprising a high-frequency wave output unit;permanent magnets disposed on two opposite sides of the anode cylinder, respectively; anda magnetic yoke which houses therein the anode cylinder and the permanent magnets,wherein a portion, on a high-frequency wave output side, of the magnetic yoke is formed with a plurality of cut and raised parts, and a metal plate which matches the high-frequency wave output unit and the cut and raised parts is sandwiched between one of the permanent magnet and the magnetic yoke, whereby the anode cylinder and the magnetic yoke are positioned with respect to and fixed to each other.
- The magnetron according to claim 1,
wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a cut and raised part which matches a hole formed by the cut and raised part in the magnetic yoke, and the cut and raised part of the waveguide unit is fitted in the hole of the magnetic yoke, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other. - The magnetron according to claim 1,
wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a projection which matches a hole formed by the cut and raised part in the magnetic yoke, and the projection of the waveguide unit is fitted in the hole of the magnetic yoke, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other. - The magnetron according to claim 1,
wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with a hole which matches the cut and raised part of the magnetic yoke, and the cut and raised part of the magnetic yoke is fitted in the hole of the waveguide unit, whereby the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other. - A magnetron comprising:an anode cylinder comprising a high-frequency wave output unit;permanent magnets disposed on two opposite sides of the anode cylinder, respectively; anda magnetic yoke which houses therein the anode cylinder and the permanent magnets,wherein a portion, on a high-frequency wave output side, of the magnetic yoke is formed with a plurality of holes, a metal plate which matches the high-frequency wave output unit and the holes is sandwiched between one of the permanent magnet and the magnetic yoke, and positioning rods are inserted in the respective holes, whereby the anode cylinder and the magnetic yoke are positioned with respect to and fixed to each other.
- The magnetron according to claim 5,
wherein a waveguide unit, to which the magnetron is attached, of a microwave-using apparatus is formed with holes which match the respective holes of the magnetic yoke, and the magnetic yoke and the waveguide unit are positioned with respect to and fixed to each other by the positioning rods. - A microwave-using apparatus comprising the magnetron according to any one of claims 1 to 6.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011266565A JP6171162B2 (en) | 2011-12-06 | 2011-12-06 | Microwave equipment |
PCT/JP2012/007827 WO2013084497A1 (en) | 2011-12-06 | 2012-12-06 | Magnetron and microwave-using equipment |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2790204A1 true EP2790204A1 (en) | 2014-10-15 |
EP2790204A4 EP2790204A4 (en) | 2015-04-15 |
EP2790204B1 EP2790204B1 (en) | 2021-02-03 |
Family
ID=48573886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12855050.6A Active EP2790204B1 (en) | 2011-12-06 | 2012-12-06 | Magnetron and microwave-using equipment |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2790204B1 (en) |
JP (1) | JP6171162B2 (en) |
CN (1) | CN103975412B (en) |
WO (1) | WO2013084497A1 (en) |
Families Citing this family (1)
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CN106252182A (en) * | 2016-09-14 | 2016-12-21 | 南京三乐微波技术发展有限公司 | A kind of continuous wave magnetron waveguide excitation device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4074169A (en) * | 1975-09-19 | 1978-02-14 | Hitachi, Ltd. | Magnetron with harmonic frequency output suppression |
JPS5981834A (en) * | 1982-11-01 | 1984-05-11 | Hitachi Ltd | Magnetron |
EP0327116A1 (en) * | 1988-02-03 | 1989-08-09 | Sanyo Electric Co., Ltd. | Magnetron |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5192037U (en) * | 1975-01-23 | 1976-07-23 | ||
JPS539463A (en) * | 1976-07-14 | 1978-01-27 | Matsushita Electronics Corp | Magnetron unit |
JPS5755724Y2 (en) * | 1977-11-24 | 1982-12-01 | ||
JPS58178264U (en) * | 1982-05-25 | 1983-11-29 | 株式会社東芝 | magnetron |
JPS6321725A (en) * | 1986-07-16 | 1988-01-29 | Matsushita Electric Ind Co Ltd | Magnetron |
JP2002033056A (en) * | 2000-07-14 | 2002-01-31 | Toshiba Corp | Pulse magnetron device and method of manufacturing the same |
JP2003100225A (en) * | 2001-09-25 | 2003-04-04 | Sanyo Electric Co Ltd | Magnetron |
KR100857601B1 (en) * | 2007-04-03 | 2008-09-09 | 삼성전자주식회사 | Magnetron and electromagnetic wave shielding gasket |
CN102334174B (en) * | 2009-02-27 | 2014-04-30 | 松下电器产业株式会社 | Magnetron and microwave utilization device |
-
2011
- 2011-12-06 JP JP2011266565A patent/JP6171162B2/en not_active Expired - Fee Related
-
2012
- 2012-12-06 EP EP12855050.6A patent/EP2790204B1/en active Active
- 2012-12-06 WO PCT/JP2012/007827 patent/WO2013084497A1/en active Search and Examination
- 2012-12-06 CN CN201280059927.1A patent/CN103975412B/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4074169A (en) * | 1975-09-19 | 1978-02-14 | Hitachi, Ltd. | Magnetron with harmonic frequency output suppression |
JPS5981834A (en) * | 1982-11-01 | 1984-05-11 | Hitachi Ltd | Magnetron |
EP0327116A1 (en) * | 1988-02-03 | 1989-08-09 | Sanyo Electric Co., Ltd. | Magnetron |
Non-Patent Citations (1)
Title |
---|
See also references of WO2013084497A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP6171162B2 (en) | 2017-08-02 |
JP2013120628A (en) | 2013-06-17 |
WO2013084497A1 (en) | 2013-06-13 |
CN103975412A (en) | 2014-08-06 |
EP2790204A4 (en) | 2015-04-15 |
EP2790204B1 (en) | 2021-02-03 |
CN103975412B (en) | 2017-05-31 |
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