US4100463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetron, power supply, and fan integral assembly
Assignee: Hitachi Ltd
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Filing: 1976-08-30
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Granted: 1978-07-11
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Expires: 1996-08-30
Abstract
Abstract A magnetron oscillator, a source circuit for energizing the magnetron oscillator and a fan are contained in independent casing units and the casing units are removably connected together into an integral assembly such that the fan circulates cooling air through the source unit and the magnetron oscillator unit.
Inventors
- 👤 Jiro Sugie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:56
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/642; H01; H01J; H01J23/00; H01J23/005; H03; H03B; H03B9/00; H03B9/01; H03B9/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
160 words
Magnetron apparatus comprising a magnetron oscillator unit for generating microwave power, a source unit containing a power source unit for operating said magnetron oscillator unit, a fan unit for circulating cooling air through said magnetron oscillator unit and said source unit, said magnetron unit, power source unit, and fan unit each being contained in a different metal casing, each casing having walls and at least two openings in its walls to provide an air passage through each casing, and means for connecting together the casings into an integral assembly, one air passage opening of a casing being coincident with one air passage opening of a different casing to which it is connected by said connecting means to form an air passage through said connected magnetron, power source, and fan casings having an air inlet opening provided by an opening in a wall of one casing and an air outlet opening provided by an opening in a wall of different casing.
Claim 2
Dependent Claim
160 words
Magnetron apparatus comprising a magnetron oscillator unit for generating microwave power, a source unit containing a power source unit for operating said magnetron oscillator unit, a fan unit for circulating cooling air through said magnetron oscillator unit and said source unit, said magnetron unit, power source unit, and fan unit each being contained in a different metal casing, each casing having walls and at least two openings in its walls to provide an air passage through each casing, and means for connecting together the casings into an integral assembly, one air passage opening of a casing being coincident with one air passage opening of a different casing to which it is connected by said connecting means to form an air passage through said connected magnetron, power source, and fan casings having an air inlet opening provided by an opening in a wall of one casing and an air outlet opening provided by an opening in a wall of different casing.
Claim 3
Dependent Claim
130 words
The magnetron apparatus according to claim 1 wherein said source unit comprises a metal casing into which filament terminals of said magnetron oscillator unit project, said source casing having opposite side openings, the magnetron oscillator unit having opposite side openings in its casing and having a plurality of cooling fins extending in the direction of its casing openings and also perpendicular to the axis of said magnetron oscillator unit, and wherein said fan unit comprises a casing having openings at the opposite ends of one wall of its casing, one fan casing opening facing one of the side openings of the source unit and the other fan casing opening facing one of the side openings of said magnetron oscillator unit casing for circulating the cooling air through said cooling fins.
Claim 4
Dependent Claim
60 words
The magnetron apparatus according to claim 2 wherein said magnetron oscillator unit casing is mounted on said source unit casing by a wall of each having no opening to form a sub-assembly, and said fan unit casing is connected to one side of the sub-assembly of said magnetron oscillator unit and said source unit with coincident openings in the casings.
Claim 5
Dependent Claim
41 words
The magnetron apparatus according to claim 3 wherein the side opening of said metal casing of the source unit on the side opposite said fan unit casing is provided with a metal wire net for preventing the leakage of microwave energy.
Claim 6
Dependent Claim
36 words
The magnetron apparatus according to claim 2 wherein the metal casing of the source unit contains all elements of the source circuit and provided with a cord adapted to be connected with a source of supply.
Claim 7
Dependent Claim
14 words
The magnetron apparatus according to claim 1 wherein said source circuit comprises an inverter.
Claim 8
Dependent Claim
51 words
The magnetron apparatus according to claim 5 wherein said source circuit comprises a rectifier circuit for rectifying an AC input, a capacitor for smoothing the DC output of said rectifier circuit, and said inverter converts the smoothed DC output into high voltage high frequency output for operating the magnetron oscillator unit.
Claim 9
Dependent Claim
41 words
The magnetron apparatus according to claim 7 wherein one portion of the high frequency output is supplied to the filament of the magnetron oscillator and the other portion is applied to the anode electrode of the magnetron oscillator through a rectifier.
Claim 10
Dependent Claim
37 words
The magnetron apparatus according to claim 7 wherein said inverter comprises a pair of alternately ON/OFF controlled semiconductor switching elements and a transformer for boosting up the voltage of the DC current interrupted by said switching elements.
Claim 11
Dependent Claim
63 words
The magnetron apparatus according to claim 1 wherein said source unit comprises a metal casing for receiving filament terminals of the magnetron oscillator unit protruding into said casing and a filter circuit, and said metal casing air passage opening comprises a plurality of perforations of a size not to leak the microwave, said perforations acting as a portion of the air circulation passage.
Claim 12
Dependent Claim
38 words
The magnetron apparatus according to claim 1 wherein said source unit comprises a metal casing containing the elements of the source circuit, one element thereof having a large size being positioned to the outside of said metal casing.
Claim 13
Dependent Claim
22 words
The magnetron apparatus according to claim 1 wherein said magnetron oscillator unit, said source unit and said fan unit are removably interconnected.
Claim 14
Dependent Claim
36 words
The magnetron apparatus according to claim 1 wherein said magnetron oscillator unit, said source unit and said fan unit casings are superposed one upon the other in the order mentioned along the axis of a magnetron.
Claim 15
Dependent Claim
20 words
The magnetron apparatus according to claim 13 wherein said magnetron is provided with a plurality of radially extending cooling fins.
Claim 16
Dependent Claim
44 words
The magnetron apparatus of claim 3 wherein the magnetron unit casing comprises a magnetron yoke for said magnetron unit in the form of a cubic box with opposing-side openings to allow air flow through the yoke and over the magnetron unit within the yoke.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |