EP2546861A1 - Magnetron, and device using microwaves - Google Patents
Magnetron, and device using microwaves Download PDFInfo
- Publication number
- EP2546861A1 EP2546861A1 EP11753059A EP11753059A EP2546861A1 EP 2546861 A1 EP2546861 A1 EP 2546861A1 EP 11753059 A EP11753059 A EP 11753059A EP 11753059 A EP11753059 A EP 11753059A EP 2546861 A1 EP2546861 A1 EP 2546861A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- anode cylinder
- magnet
- connection portion
- magnetron
- permanent magnets
- 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.)
- Granted
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Classifications
-
- 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
- H01J23/005—Cooling methods or arrangements
-
- 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
Abstract
Description
- The present invention relates to a magnetron and a device using microwaves.
- A configuration of a liquid-cooled magnetron will be described with reference to
FIGS. 6A and 6B. FIG. 6A is an overall configuration diagram of amagnetron 100 in a conventional example, andFIG. 6B is a perspective view of acooling block 110. As illustrated inFIG. 6A , themagnetron 100 is equipped with thecooling block 110 that contacts an outer peripheral surface of an anode cylinder (not shown) within ayoke 106, and that internally includes acirculation conduit 112 which allows a medium for cooling the anode cylinder to flow therein. Also, thecooling block 110 thermally contactspermanent magnets 105 disposed on both ends of the anode cylinder in a long axis direction thereof, and a part of the yoke 106 (refer to Patent Document 1). - As illustrated in
FIG. 6B , thecooling block 110 is made of a material having a cooling function, and aninlet port 112A and anoutput port 112B of thecirculation conduit 112 are formed on one side surface thereof. Thecirculation conduit 112 extends from theinlet port 112A, is formed inside of thecooling block 110 in substantially a U-shaped configuration so as to surround the anode cylinder, and arrives at theoutput port 112B. - When the
circulation conduit 112 is formed inside of thecooling block 110, a circulation conduit parallel to the one side surface of thecooling block 110 in which theinlet port 112A and theoutput port 112B of thecirculation conduit 112 are formed by penetrating through thecooling block 110 and then stopping by acap 112C inFIG. 6B . - Patent Document 1:
JP-A-5-054805 - In general, in an air-cooled magnetron, the permanent magnets are cooled directly by wind. On the other hand, in the liquid-cooled magnetron, because the permanent magnets are cooled indirectly through a magnetic yoke, the cooling effect is low. Further, during the operation of the magnetron, the permanent magnet is degaussed because of high temperature, and the magnetic flux density is decreased to drop an anode voltage. As a result, the output of the liquid-cooled magnetron is decreased.
- Also, in the above-mentioned liquid-cooled
magnetron 100, since most of thecooling block 110 contacts the anode cylinder, the anode cylinder that becomes at high temperature during the operation of themagnetron 100 is cooled by the medium flowing in thecirculation conduit 112. However, a portion of thecooling block 110, which thermally contacts thepermanent magnets 105, is extremely small as compared with theentire cooling block 110, and the cooling effect on thepermanent magnets 105 cannot be expected. - Also, although the portion of the
cooling block 110, which thermally contacts thepermanent magnets 105, is small, the portion is integrated with a portion that contacts the anode cylinder. Therefore, thecooling block 110 per se is upsized. - Further, because the
cooling block 110 is an integral block that covers thepermanent magnets 105, a contact property of the inner side of thecooling block 110 with thepermanent magnets 105 is degraded due to distortion of the outer diameter of thepermanent magnets 105, and the radiation effect is low. Also, when thecooling block 110 and thepermanent magnets 105 forcedly contacts each other during assembling, a trouble occurs in the oscillation characteristic of themagnetron 100 due to the deformation of thepermanent magnets 105 or the anode cylinder. - Further, in the above-mentioned
magnetron 100, in manufacturing thecooling block 110, for example, when the anode cylinder is positioned with respect to the anode cylinder, a gap is slightly formed between a portion of thecooling block 110 which contacts thepermanent magnets 105 and thepermanent magnets 105. For that reason, a cooling performance of thecooling block 110 with respect to thepermanent magnets 105 is not kept constant, and varied. - An object of the present invention is to provide a magnetron configured so that a connection portion provided separately from a cooling member can contact a permanent magnet, whereby an anode cylinder and a permanent magnet can be efficiently cooled, and the cooling member per se can be prevented from being upsized while a variation of the cooling performance to the permanent magnet is suppressed.
- The present invention provides a magnetron including: an anode cylinder; permanent magnets disposed on both ends of the anode cylinder; a magnetic yoke which stores the anode cylinder and the permanent magnets therein; a cooling member which stores the anode cylinder therein and which has at least a part thereof fixed to the anode cylinder; and a connection portion arranged between the magnetic yoke and the cooling member.
- In the magnetron described above, the connection portion allows the permanent magnet and the cooling member to contact each other.
- In the magnetron described above, an inner surface of the connection portion contacts the permanent magnet, and a surface of the connection portion substantially perpendicular to the inner surface is fixed to the cooling member.
- In the magnetron described above, the connection portion is made of any one of: copper and copper alloy; and aluminum and aluminum alloy.
- In the magnetron described above, the connection portion includes a plurality of magnet contact pieces arranged along an outer peripheral surface of the permanent magnet having an annular shape, and each of the magnet contact pieces includes: a horizontal portion fixed to the cooling member; and an erect portion which has a surface continuous to the horizontal portion and which contacts the outer peripheral surface of the permanent magnet.
- In the magnetron described above, the connection portion is arranged along an outer peripheral surface of the permanent magnet having an annular shape, and the connection portion includes: a plurality of horizontal portions fixed to the cooling member; and an erect portion which has a surface continuous to the plurality of horizontal portion and which contacts the outer peripheral surface of the permanent magnet.
- In the magnetron described above, the connection portion is formed of a molded member made of an insulating resin having high thermal conductivity.
- In the magnetron described above, a thermal conductive paste is coated between: the connection portion and the permanent magnet; and/or the connection portion and the cooling member.
- The present invention provides a device using microwaves including the magnetron described above.
- According to the magnetron and the device using microwaves, by a configuration in which a connection portion provided separately from a cooling member can contact a permanent magnet, an anode cylinder and a permanent magnet can be efficiently cooled, and the cooling member per se can be prevented from being upsized while a variation of the cooling performance to the permanent magnet is suppressed.
-
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FIG. 1 is an overall configuration diagram of amagnetron 1 according to an embodiment of the present invention. -
FIG. 2A is a plan view of acooling block 20, andFIG. 2B is a side view of thecooling block 20. -
FIG. 3A is a plan view of acooling block 40, andFIG. 3B is a side view of thecooling block 40. -
FIG. 4 is a perspective view of amagnet contact piece 41 B. -
FIG. 5 is a perspective view of an annularmagnet contact portion 61 B. -
FIG. 6A is an overall configuration diagram of amagnetron 100 in a conventional example, andFIG. 6B is a perspective view of acooling block 110. - Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
-
FIG. 1 is an overall configuration diagram of amagnetron 1 according to an embodiment of the present invention. Themagnetron 1 illustrated inFIG. 1 mainly includes amagnetic yoke 4, anoutput portion 9 disposed on an upper portion of themagnetic yoke 4, and afilter 11 disposed below themagnetic yoke 4. Ananode cylinder 10, two annularpermanent magnets anode cylinder 10, and acooling block 20 that covers the surrounding of theanode cylinder 10 are accommodated within themagnetic yoke 4. Afilter 11 includes a choke coil and apenetration capacitor 7. - The
magnetic yoke 4 has one end opened and the other end closed, and includes amain body 4a, and acover 4b that closes an opening end of themain body 4a. The two annularpermanent magnets anode cylinder 10, and thecooling block 20 that covers the surrounding of theanode cylinder 10 are accommodated within themagnetic yoke 4. - The
anode cylinder 10 is held by themagnetic yoke 4 from the outsides of the annularpermanent magnets permanent magnet 8B disposed on a lower side of the drawing is a magnet of the input side, and the annularpermanent magnet 8A arranged on an upper side thereof is a magnet on an output side. Anode vanes are arranged radially within theanode cylinder 10, and cavity resonators are formed by spaces surrounded by the respective adjacent anode vanes and theanode cylinder 10. Also, an anode structure is arranged in the center of theanode cylinder 10, and the spaces surrounded by the anode structure and the anode vanes form active spaces. - When the
magnetron 1 according to this embodiment is used, after an interior of themagnetron 1 is put into a vacuum state, a desired electric power is supplied to the anode structure to emit thermions, and a high DC voltage is applied between the anode vanes and the anode structure. A magnetic field is created in the active spaces in a direction orthogonal to a direction along which the anode structure and theanode cylinder 10 face each other by the annularpermanent magnets - The
cooling block 20 includes amain body 21A that contacts theanode cylinder 10, and twomagnet contact portions 21 B that are formed separately from themain body 21A, that contact the annularpermanent magnets permanent magnets - The two
magnet contact portions 21 B are connection portions that each connect themain body 21A to the annularpermanent magnet main body 21A. - Also, the
main body 21A contacts theanode cylinder 10, and mainly cools theanode cylinder 10. On the other hand, the twomagnet contact portions 21 B are regarded as the connection portions when viewed from themain body 21A, but have a function of cooling the annularpermanent magnets main body 21A and the twomagnet contact portions 21 B configuring thecooling block 20 function as a cooling member. - Also, the
cooling block 20 has afirst fastening portion 22A in a part thereof, and is fixed to theanode cylinder 10 by fasteningfirst screws 22B of thefirst fastening portion 22A after having been mounted on theanode cylinder 10. For that reason, an inner wall surface of thecooling block 20 contacts an outer wall surface of theanode cylinder 10. When thecooling block 20 is fixed to theanode cylinder 10, a slight gap is formed between the coolingblock 20 and themagnetic yoke 4. - The
cooling block 20 is made of a metal having a high thermal conductivity, and a cooledliquid circulation conduit 23 for circulating the cooled liquid is formed inside thereof. The cooled liquid flows into the cooledliquid circulation conduit 23. For that reason, thecooling block 20 can efficiently cool theanode cylinder 10 and the annularpermanent magnets cooling block 20. In themagnetron 1 according to this embodiment, thecooling block 20 is made of aluminum. - Subsequently, a configuration of the
cooling block 20 will be described with reference toFIGS. 2A and 2B. FIG. 2A is a plan view of thecooling block 20 when viewed from above, andFIG. 2B is a side view of thecooling block 20. - The
main body 21A internally includes afirst container 24 that contains theanode cylinder 10 therein, and the cooledliquid circulation conduit 23. InFIG. 2A , as indicated by dashed lines, the cooledliquid circulation conduit 23 extends from aninlet port 23A, is formed inside of themain body 21A in a substantially U-shape so as to surround theanode cylinder 10, and arrives at anoutlet port 23B. - An
inner surface 24A which is a curved surface of thefirst container 24 contacts the anode cylinder 10 (refer toFIG. 2A ). - Also, the
main body 21 A has thefirst fastening portion 22A on one side surface thereof. After thecooling block 20 has been installed into theanode cylinder 10, thefirst screws 22B of thefirst fastening portion 22A is fastened so that theinner surface 24A which is the curved surface of thefirst container 24 contacts theanode cylinder 10 contained within thefirst container 24, and is fixed thereto (refer toFIG. 2A ). For that reason, themain body 21A can efficiently cool theanode cylinder 10. - Also, four first screw holes 22C are formed in
opposite surfaces 27A of themain body 21A, which face themagnet contact portions 21 B, so as to be continuous to respective foursecond screw holes 26D formed in themagnet contact portions 21 B. The first screw holes 22C receive respectivethird screws 26C for fixing themagnet contact portions 21 B to themain body 21A. The first screw holes 22C are so provided as to avoid the cooledliquid circulation conduit 23. - The
opposite surfaces 27A facing themagnet contact portions 21 B are surfaces substantially perpendicular to theinner surface 24A of thefirst container 24. - The
opposite surfaces 27A of themain body 21A, which face themagnet contact portions 21 B, contactupper surfaces 28B of the magnet contact portions 21 B. For that reason, themain body 21A and themagnet contact portions 21 B can thermally contact each other. - The
magnet contact portions 21 B, which are separate from themain body 21A, have substantially the same shape as that of themain body 21A, but is smaller in size than themain body 21A. Each of themagnet contact portions 21 B internally includes asecond container 25 that contains the annularpermanent magnet 8A (or 8B). As described above, each of themagnet contact portions 21 B forms the connection portions that connect themain body 21A to the annularpermanent magnet main body 21A. - An
inner surface 25A which is a curved surface of thesecond container 25 contacts the annularpermanent magnet 8A (or 8B) (refer toFIG. 2A ). - Also, the
magnet contact portions 21 B each have asecond fastening portion 26A on one side surface thereof. After themain body 21 A contacts and is fixed to theanode cylinder 10, asecond screw 26B of thesecond fastening portion 26A is fastened so that theinner surface 25A that is a curved surface of thesecond container 25 contacts and is fixed to the annularpermanent magnets second container 25. For that reason, themagnet contact portions 21 B can efficiently cool the annularpermanent magnets - The upper surfaces 28B of the
magnet contact portions 21 B contact theopposite surfaces 27A of themain body 21A. For that reason, themagnet contact portions 21 B and themain body 21A can thermally contact each other. - Also, the
magnet contact portions 21 B are fastened to themain body 21A with the fourthird screws 26C. The second screw holes 26D and the first screw holes 22C, which receive thethird screws 26C, each have a diameter slightly larger than the diameter of thethird screws 26C with an allowance. For that reason, when themagnet contact portions 21 B contact the annularpermanent magnet 8A (or 8B), even if themagnet contact portions 21 B are displaced with respect to themain body 21A, themagnet contact portions 21 B can be surely fastened to themain body 21 A with the fourthird screws 26C. - As described above, in the
magnetron 1 according to this embodiment, themagnet contact portions 21 B are provided separately from themain body 21A. This is because even if themain body 21A contacts and is fixed to theanode cylinder 10, themagnet contact portions 21 B can contact and be fixed to the annularpermanent magnets magnetron 1 according to this embodiment, even if themain body 21 A contacts and fixed to theanode cylinder 10 for positioning, themagnet contact portions 21 B can contact and be fixed to the annularpermanent magnets - Accordingly, in the
magnetron 1 according to this embodiment, the cooling performance of thecooling block 20 for the annularpermanent magnets magnetron 1 according to this embodiment, since the respectivemagnet contact portions 21 B are smaller than themain body 21 A, thecooling block 20 can be prevented from being upsized. - In the
magnetron 1 according to this embodiment, themain body 21A and themagnet contact portions 21 B of thecooling block 20 are made of aluminum, but are not limited to this material. There may be applicable a metal high in thermal conductivity, for example, the combination of metal such as the above-mentioned aluminum and aluminum alloy, or copper and copper alloy. - A thermal conductive paste may be coated between the
inner surface 25A of thesecond container 25 and the annularpermanent magnets - The thermal conductive paste may be coated between the
opposite surfaces 27A of themain body 21A and theupper surfaces 28B of themagnet contact portions 21 B for the purpose of improving the thermal connection. - Thermal diffusion compound may be coated in a slight gap between an outer wall surface of the
main body 21A and an inner wall surface of themagnetic yoke 4. Even if a gap accidentally occurs in the contact portion, an excellent thermal conductive state is obtained, and those members are fixed to each other on the contact portion. For that reason, thecooling block 20 can cool not only theanode cylinder 10 and annularpermanent magnets magnetic yoke 4 as well as the annularpermanent magnets filter 11 indirectly through themagnetic yoke 4. - Subsequently, a modified example 1 of the
cooling block 20 in themagnetron 1 according to this embodiment will be described with reference toFIGS. 3A, 3B , and4 .FIG. 3A is a plan view of acooling block 40, andFIG. 3B is a side view of thecooling block 40. Also,FIG. 4 is a perspective view of a magnet contact piece 41 B. Parts common to thecooling block 20 are denoted by identical symbols, and a detailed description thereof will be omitted. Thecooling block 40 illustrated inFIGS. 3A and 3B includes amain portion 41A and a plurality of themagnet contact pieces 41 B. - In this example, the plurality of
magnet contact pieces 41 B are connection portions that connect themain portion 41A to the annularpermanent magnets main portion 41A. - Also, the
main portion 41A contacts theanode cylinder 10, and mainly cools theanode cylinder 10. On the other hand, the plurality ofmagnet contact pieces 41 B form the connection portions when viewed from themain portion 41A, but has a function of cooling the annularpermanent magnets main portion 41 A and the plurality ofmagnet contact pieces 41 B, which configure thecooling block 40, function as a cooling member. - The
main portion 41A internally includes thefirst container 24 that contains theanode cylinder 10 therein, and the cooledliquid circulation conduit 23. InFIG. 3A , as indicated by dashed lines, the cooledliquid circulation conduit 23 extends from theinlet port 23A, is formed inside of themain body 21A in a substantially U-shape so as to surround theanode cylinder 10, and arrives at theoutlet port 23B. - Also, the
main portion 41A has thefirst fastening portion 22A on one side surface thereof. After thecooling block 20 has been installed into theanode cylinder 10, thefirst screws 22B of thefirst fastening portion 22A are fastened so that thefirst container 24 contacts theanode cylinder 10 contained within thefirst container 24, and is fixed thereto. For that reason, themain portion 41A can efficiently cool theanode cylinder 10. - Also, ten fourth screw holes 42C are formed in surfaces of the
main portion 41 A, which face themagnet contact pieces 41 B, so as to be continuous to respectivethird screw holes 46D formed in themagnet contact pieces 41 B. The fourth screw holes 42C receive respectivefourth screws 46C for fixing the respectivemagnet contact pieces 41 B to themain portion 41A. The fourth screw holes 42C are so provided as to avoid the cooledliquid circulation conduit 23. - In
FIG. 3B , for description, thefourth screws 46C, the fourth screw holes 42C, and the third screw holes 46D are illustrated one by one. In fact, those screws and screw holes are provided in each of themagnet contact pieces 41 B. - Subsequently, a description will be given of the
magnet contact pieces 41 B with reference toFIGS. 3A, 3B , and4 . As illustrated inFIG. 4 , each of themagnet contact pieces 41 B includes ahorizontal portion 43 fixed to themain portion 41A, and anerect portion 44 that extends from one end of thehorizontal portion 43 in a substantially perpendicular direction, and contacts the annularpermanent magnets - The
erect portion 44 has asurface 44A substantially perpendicular to thehorizontal portion 43. Thesurface 44A may have a given radius of curvature so as to contact the outer peripheral surfaces of the annularpermanent magnets - The
horizontal portion 43 has thethird screw hole 46D that penetrates through thehorizontal portion 43. As described above, thethird screw hole 46D is provided for inserting thefourth screw 46C thereinto. Also, as illustrated inFIG. 4 , thethird screw hole 46D is formed into an elongate hole, and a long axis direction (direction of an arrow X in the figure) of thethird screw hole 46D coincides with a radial direction of the annularpermanent magnets main portion 41A has been fastened to theanode cylinder 10 contained in thefirst container 24, when themagnet contact piece 41 B is fastened to themain portion 41A with thefourth screw 46C, a position of themagnet contact piece 41 B to themain portion 41A can be so adjusted as to contact the annularpermanent magnets permanent magnets third screw hole 46D. For that reason, thesurface 44A of theerect portion 44 surely contacts the annularpermanent magnets - Subsequently, a description will be given of a location of the
magnet contact pieces 41 B with reference toFIGS. 3A and 3B . - As illustrated in
FIG. 3A , the respectivemagnet contact pieces 41 B are arranged at regular intervals along the outer peripheral surface of the annularpermanent magnets magnet contact pieces 41 B are fastened to an upper surface (or lower surface) of themain portion 41A with the respectivefourth screws 46C so that thesurfaces 44A of theerect portion 44 contact the annularpermanent magnet 8A (or 8B). - The
third screw holes 46D that receive the respectivefourth screws 46C are formed into the elongate holes for the purpose of providing a slight allowance. For that reason, even if the respectivemagnet contact pieces 41 B are slightly displaced with respect to themain portion 41A when themagnet contact pieces 41 B contact the annularpermanent magnets magnet contact pieces 41 B are fastened to the upper surface (or lower surface) of the main portion 41Awith thefourth screws 46C. - As described above, in the
magnetron 1 according to this embodiment, the plurality ofmagnet contact pieces 41 B are disposed separately from themain portion 41A. This is because even if themain portion 41A has been positioned to theanode cylinder 10, the respectivemagnet contact pieces 41 B are easily positioned to and contact the annularpermanent magnet 8A (or 8B). For that reason, for example, in the conventional example, when the cooling block is positioned with respect to the anode cylinder, the gap is slightly generated in a portion that contacts the permanent magnet with respect to the permanent magnet. On the other hand, in themagnetron 1 according to this embodiment, even if themain portion 41A has been positioned to theanode cylinder 10, the respectivemagnet contact pieces 41 B can be easily positioned to and contact the annularpermanent magnets - The
cooling block 40 is made of aluminum, but is not limited to this material. For example, thecooling block 40 may be made of aluminum alloy, copper, and copper alloy. - The
main portion 41A and themagnet contact pieces 41B of thecooling block 40 are made of a metal having the same high thermal conductivity, but are not limited to this material. For example, there may be applicable the combination of metal such as the above-mentioned aluminum and aluminum alloy, or copper and copper alloy. - Thermal diffusion compound may be coated in a slight gap between an outer wall surface of the
main portion 41A and an inner wall surface of themagnetic yoke 4. Even if a gap accidentally occurs in the contact portion, an excellent thermal conductive state is obtained, and those members are fixed to each other on the contact portion. For that reason, thecooling block 40 can cool not only theanode cylinder 10 and annularpermanent magnets magnetic yoke 4 as well as the annularpermanent magnets filter 11 indirectly through themagnetic yoke 4. - In the
cooling block 40, the respectivemagnet contact pieces 41 B are screwed to themain portion 41A, individually. Alternatively, an annularmagnet contact portion 61 B illustrated inFIG. 5 may be used instead of the magnet contact pieces 41 B.FIG. 5 is a perspective view of the annularmagnet contact portion 61 B. - In this example, as with the
magnet contact pieces 41 B, the annularmagnet contact portion 61 B form a connection portion that connects themain portion 41A to the annularpermanent magnets - Also, the
main portion 41A contacts theanode cylinder 10, and mainly cools theanode cylinder 10. On the other hand, the annularmagnet contact portion 61 B form a connection portion when viewed from themain portion 41A, but has a function of cooling the annularpermanent magnets main portion 41A and the annularmagnet contact portion 61 B, which configure thecooling block 40, function as a cooling member. - As illustrated in
FIG. 5 , the annularmagnet contact portion 61 B includeshorizontal portions 63, and an annularerect portion 64 that erects from thehorizontal portions 63 in a substantially perpendicular direction. - An inner
peripheral surface 64A which is a curved surface of the annularmagnet contact portion 61 B contacts the outer peripheral surfaces of the annularpermanent magnets third fastening portion 62A with afifth screw 62B. - The
horizontal portions 63 are arranged at regular intervals on the outer periphery of the annularerect portion 64. Also, each of thehorizontal portions 63 has thethird screw hole 46D for fastening the annularmagnet contact portion 61 B to themain portion 41A. - The
magnet contact portions 21 B, themagnet contact pieces 41 B, and the annularmagnet contact portion 61 B, which function as the connection portion, may be formed of a molded member made of an insulating resin high in the thermal conductivity. For example, a material such as a filer is conceivable. - The
magnet contact portions 21 B may be configured to be sandwiched between themagnetic yoke 4b and themain body 21A. - In order to fasten the
first screws 22B of thefirst fastening portion 22A, or in order to fasten thethird fastening portion 62A with thefifth screw 62B, driver insertion holes of a fixed number may be provided in themagnetic yoke - The thermal conductive paste may be replaced with a thermal conductive sheet or a fiber metal.
- The present invention has been described in detail and with reference to the special embodiments. However, it would be apparent from an ordinary skilled person that the present invention can be variously changed and modified without departing from the spirit and scope of the present invention.
- The present invention is based on Japanese Patent Application No.
2010-056057 filed on March 12, 2010 - The magnetron and the device using microwaves according to the present invention has advantages of efficiently cooling the anode cylinder and the permanent magnet, and preventing the cooling member per se from being upsized while suppressing a variation of the cooling performance for the permanent magnet, and are useful as microwaves.
-
- 1: Magnetron
- 4: Magnetic Yoke
- 8A, 8B: Annular Permanent Magnet
- 10: Anode Cylinder
- 20, 40: Cooling Block
- 21A: Main Body
- 21 B: Magnet Contact Portion
- 24: First Container
- 25: Second Container
- 41A: Main Portion
- 41B: Magnet Contact Piece
- 61B: Annular Magnet Contact Portion
- 63: Horizontal Portion
- 64: Erect Portion
Claims (9)
- A magnetron comprising:an anode cylinder;permanent magnets disposed on both ends of the anode cylinder;a magnetic yoke which stores the anode cylinder and the permanent magnets therein;a cooling member which stores the anode cylinder therein and which has at least a part thereof fixed to the anode cylinder; anda connection portion arranged between the magnetic yoke and the cooling member.
- The magnetron according to claim 1,
wherein the connection portion allows the permanent magnet and the cooling member to contact each other. - The magnetron according to claim 2,
wherein an inner surface of the connection portion contacts the permanent magnet, and
wherein a surface of the connection portion substantially perpendicular to the inner surface is fixed to the cooling member. - The magnetron according to any one of claims 1 to 3,
wherein the connection portion is made of any one of: copper and copper alloy; and aluminum and aluminum alloy. - The magnetron according to any one of claims 1 to 3,
wherein the connection portion comprises a plurality of magnet contact pieces arranged along an outer peripheral surface of the permanent magnet having an annular shape, and
wherein each of the magnet contact pieces comprises:a horizontal portion fixed to the cooling member; andan erect portion which has a surface continuous to the horizontal portion and which contacts the outer peripheral surface of the permanent magnet. - The magnetron according to claim 1,
wherein the connection portion is arranged along an outer peripheral surface of the permanent magnet having an annular shape, and
wherein the connection portion comprises:a plurality of horizontal portions fixed to the cooling member; andan erect portion which has a surface continuous to the plurality of horizontal portion and which contacts the outer peripheral surface of the permanent magnet. - The magnetron according to any one of claims 1, 5 and 6,
wherein the connection portion is formed of a molded member made of an insulating resin having high thermal conductivity. - The magnetron according to claim 7,
wherein a thermal conductive paste is coated between: the connection portion and the permanent magnet; and/or the connection portion and the cooling member. - A device using microwaves, comprising the magnetron according to any one of claims 1 to 8.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010056057A JP5497496B2 (en) | 2010-03-12 | 2010-03-12 | Magnetron and microwave equipment |
PCT/JP2011/001420 WO2011111396A1 (en) | 2010-03-12 | 2011-03-10 | Magnetron, and device using microwaves |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2546861A1 true EP2546861A1 (en) | 2013-01-16 |
EP2546861A4 EP2546861A4 (en) | 2014-09-17 |
EP2546861B1 EP2546861B1 (en) | 2018-08-29 |
Family
ID=44563227
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11753059.2A Active EP2546861B1 (en) | 2010-03-12 | 2011-03-10 | Magnetron, and device using microwaves |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2546861B1 (en) |
JP (1) | JP5497496B2 (en) |
WO (1) | WO2011111396A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015090850A (en) * | 2013-11-07 | 2015-05-11 | パナソニックIpマネジメント株式会社 | Magnetron |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6532035B2 (en) * | 2015-04-28 | 2019-06-19 | パナソニックIpマネジメント株式会社 | Magnetron |
CN111430203A (en) * | 2020-04-20 | 2020-07-17 | 中国工程物理研究院应用电子学研究所 | Integrated refrigeration relativistic magnetron |
Citations (3)
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JPS5378953U (en) * | 1976-12-03 | 1978-06-30 | ||
JP2000285817A (en) * | 1999-03-31 | 2000-10-13 | Matsushita Electronics Industry Corp | Magnetron device |
EP2023371A2 (en) * | 2007-08-08 | 2009-02-11 | Panasonic Corporation | Magnetron |
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Publication number | Priority date | Publication date | Assignee | Title |
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JPS5714352Y2 (en) * | 1975-09-12 | 1982-03-24 | ||
JPS5359357A (en) * | 1976-11-09 | 1978-05-29 | Matsushita Electronics Corp | Magnetron unit |
JPS5362457A (en) * | 1976-11-16 | 1978-06-03 | Matsushita Electric Ind Co Ltd | Magnetron unit |
JPS53133362A (en) * | 1977-04-27 | 1978-11-21 | Toshiba Corp | Coaxial-type magnetron |
JPH0554805A (en) | 1991-08-26 | 1993-03-05 | Hitachi Ltd | Magnetron |
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2010
- 2010-03-12 JP JP2010056057A patent/JP5497496B2/en not_active Expired - Fee Related
-
2011
- 2011-03-10 EP EP11753059.2A patent/EP2546861B1/en active Active
- 2011-03-10 WO PCT/JP2011/001420 patent/WO2011111396A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5378953U (en) * | 1976-12-03 | 1978-06-30 | ||
JP2000285817A (en) * | 1999-03-31 | 2000-10-13 | Matsushita Electronics Industry Corp | Magnetron device |
EP2023371A2 (en) * | 2007-08-08 | 2009-02-11 | Panasonic Corporation | Magnetron |
Non-Patent Citations (1)
Title |
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See also references of WO2011111396A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015090850A (en) * | 2013-11-07 | 2015-05-11 | パナソニックIpマネジメント株式会社 | Magnetron |
EP2871664A1 (en) * | 2013-11-07 | 2015-05-13 | Panasonic Intellectual Property Management Co., Ltd. | Magnetron |
US9208984B2 (en) | 2013-11-07 | 2015-12-08 | Panasonic Intellectual Property Management Co., Ltd. | Magnetron |
Also Published As
Publication number | Publication date |
---|---|
JP2011192459A (en) | 2011-09-29 |
EP2546861B1 (en) | 2018-08-29 |
WO2011111396A1 (en) | 2011-09-15 |
EP2546861A4 (en) | 2014-09-17 |
JP5497496B2 (en) | 2014-05-21 |
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