The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 19, 1995
Filed:
Jan. 22, 1993
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A high-frequency heating apparatus capable of heating uniformly a liquid load, having an economical wave guide switching unit and having a compact-sized and economical power circuit to drive a plurality of magnetrons. The high-frequency heating apparatus includes an excitation opening, provided at the bottom of a heating chamber for radiating microwaves to heat the liquid load in a container, a magnetron for generating the microwave to heat the object and a wave guide connected to a magnetron. The apparatus further includes a wave guide switching unity for switching the propagation of the microwave to one of plural wave guides. The switching unit includes a pair of circular conductive plates and a conductor disposed in the vicinity of a circumference of the circular conductive plate so as to shut off the microwave, wherein there is constructed a choke structure on the wave guide containing the circular conductive plates. The apparatus further includes a magnetron drive circuit including a filament heating power supply connected to each filament of the magnetrons, a high voltage generating element and a switching element for selectively supplying a high voltage from the high voltage generating element to an anode of the magnetrons.