Energy feed system for a microwave oven

Claim 1

1 . A microwave oven comprising an oven cavity (10) limited by a plurality of conductive walls (11-16), a microwave energy source (19), and an energy feed system (17, 20, 22, 24) for coupling energy from the microwave energy source (19) to the interior of the oven cavity (10) comprising, a feeding aperture (22) in a cavity wall (11) and a rotatable slotted disc (24) arranged within the oven cavity (10) in front of the feeding aperture (22) for producing a relatively even energy distribution within the oven cavity (10), characterized by the combination of the following measures: - the disc (24) is essentially larger than the feeding aperture (22) and is arranged at a small distance from the cavity wall (11) containing the feeding aperture (22) so that a narrow space (42') is formed between this cavity wall (11) and the disc (24), which narrow space (42') serves to propagate microwave energy from the feeding aperture (22) to the interior of the oven cavity (10); - the disc (24) comprises a plurality of slots (27-29, 46-51), which are oriented transversally to their respective radial position vectors and are dimensioned so as to be excited by microwave energy propagating in said narrow space (42 1 ) to radiate energy into the interior of the oven cavity (10); - the disc (24) is journalled eccentrically so that both the disc (24) and the slots (27-29, 46-51) perform simultaneously a rotation and a translation as the disc (24) is rotated; and - means (41, 43) are provided for passing an air stream through said narrow space (42') to impinge on projections (30-32, 44, 45) of the disc (24) so as to cause the disc (24) to rotate in a predetermined direction.