Combination microwave and convection oven

Claim 1

A combination microwave oven and heated air circulating type oven which ensures uniform heating at different levels within an oven cavity which comprises: an outer housing; an oven cavity surrounded by a ceiling wall, a bottom wall and first and second side walls, said oven cavity disposed within said outer housing and defining a clearance therebetween; upper support means and lower support means disposed in said oven cavity for supporting foodstuff to be cooked in the upper and lower portion of said oven cavity respectively, a magnetron disposed in said clearance and supplying microwave energy to said oven cavity through said ceiling wall; an intake aperture formed near the center of the ceiling wall surrounding said oven cavity; a first blowoff aperture formed in said ceiling wall near the corner confronting the first side wall of said oven cavity; a second blowoff aperture formed in a lower portion of the second side wall of said oven cavity, said second side wall of said oven cavity, said second side wall defining the opposite side to said first side wall, the arrangement of said first blowoff aperture on one of the side walls being different from the arrangement of said second blowoff aperture on the other side wall; circulation duct means disposed in said clearance and secured to said ceiling wall and said second side wall of said oven cavity for housing and providing communication between said intake aperture and said first and second blowoff apertures at the outside of said oven cavity, said intake aperture and said first and second blowoff apertures communicating with said circulating duct means; circulating fan means for creating a forced air flow in said duct means from said intake aperture to said first and second blowoff apertures, said forced air flow being directed into said oven cavity through said first and second blowoff apertures; and heater means disposed in said duct means for heating up the forced air flow whereby the heated air generated from the first blowoff aperture heats up the upper surface of the foodstuff disposed on the upper support means and the lower surface of the foodstuff disposed on the lower support means and the heated air generated from the second blowoff aperture heats up the lower surface of the foodstuff disposed on the upper support means and the upper surface of the foodstuff disposed on the lower support means.