| US 7,557,331 B2 | ||
| High frequency heating apparatus | ||
| Takahide Yamaguchi, Nara (Japan); and Koji Yamamoto, Kyoto (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Mar. 31, 2006, as Appl. No. 11/393,778. | ||
| Application 11/393778 is a division of application No. 10/739075, filed on Dec. 19, 2003, granted, now 7,214,915. | ||
| Claims priority of application No. 2002-370340 (JP), filed on Dec. 20, 2002; and application No. 2003-031229 (JP), filed on Feb. 07, 2003. | ||
| Prior Publication US 2007/0045305 A1, Mar. 01, 2007 | ||
| Int. Cl. H05B 6/68 (2006.01) | ||
| U.S. Cl. 219—757 [219/710; 219/705] | 13 Claims |
| 1. A high frequency heating apparatus, comprising:
an inverter power supply having a cooling fin;
a magnetron for generating a microwave energy, the magnetron being supplied with an electric power from the inverter power
supply;
a cooling device for cooling down the inverter power supply and the magnetron; and
an air guide portion for rectifying cooling air from the cooling device, the air guide portion including an inner partition
and an outer partition which are inclined so as to define a convergent passage in a direction of airflow,
wherein the cooling device has a propeller fan, and the air guide portion outer partition is configured to divide the cooling
air blown from the propeller fan into an upper stream and a lower stream with respect to an axis of the propeller fan and
guide the lower stream to the convergent passage and the upper stream toward the magnetron, and
wherein the outer partition generates a negative pressure region outside the air guide portion to deflect the upper stream
downward.
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