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US 5,206,478 AGranted
Microwave shielding for a door of a microwave oven
AssigneeGold Star Co., Ltd.
InventorKi I. Lee
Life of this patent
Estimating the term…
Abstract
A microwave shielding device for a door of a microwave oven includes a door frame and a choke seal formed integrally and of one piece with the door frame. The door frame includes a stepped portion formed at one side thereof defining a contact surface for contacting a front plate of the microwave when the door is closed. The choke seal includes an inner wall, a front wall, an outer wall, and a flange portion extending perpendicular to one another. Rectangular apertures, through-holes, and slits are formed in the outer wall portion and the flange portion to prevent leakage of microwave energy from the microwave oven.
Claims18
A microwave shielding device for a door of a microwave oven, comprising:
- a door frame having a stepped portion formed at one side thereof defining a surface portion for contacting a front plate of the microwave oven when the door is closed;
- and
- a choke seal formed integrally and of one piece with the door frame for preventing leakage of microwave energy from the microwave oven, wherein choke seal comprises:
- an inner wall extending from the door frame perpendicular to the stepped portion,
- a front wall extending perpendicularly from a distal end portion of the inner wall,
- an outer wall extending perpendicularly from a distal end portion of said front wall, and
- a flange extending perpendicularly from a distal end portion of the outer wall and toward the stepped portion;
- wherein a plurality of through-holes are formed in the outer wall and the flange, each said through-hole extending over a boundary between the outer wall and the flange;
- wherein a rectangular aperture is formed in the outer wall between each through-hole;
- and
- wherein a plurality of slits are formed in the flange.
8 more elements
A microwave shielding device for a door of a microwave oven, comprising:
- a door frame having a stepped portion formed at one side thereof defining a contact surface for contacting a front plate of the microwave oven when the door is closed;
- and
- a choke seal formed integrally and of one piece with the door frame for preventing leakage of microwave energy from the microwave oven, wherein said choke seal comprises:
- an inner wall extending from the door frame perpendicular to the stepped portion,
- a front wall extending perpendicularly from a distal end portion of the inner wall,
- an outer wall extending perpendicularly from a distal end portion of said front wall, and
- a flange extending perpendicularly from a distal end portion of the outer wall and toward the stepped portion;
- wherein a plurality of through-holes are formed in the outer wall and the flange, each said through-hole extending over a boundary between the outer wall and the flange;
- wherein a rectangular aperture is formed in the outer wall between each through-hole;
- wherein a plurality of slits are formed in the flange extending over the boundary between the outer wall and the flange;
- wherein a distance between adjacent slits is equal to .lambda./4, the slits are separated along the flange by a distance which alternates between .lambda./8 and .lambda./12, and the width of the slits along the flange alternates between .lambda./72 and .lambda./36;
- wherein the through-holes have dimensions of .lambda./36 by .lambda./48 in the flange and .lambda./36 by .lambda./12 in the outer wall;
- and
- wherein the rectangular apertures formed in the outer wall have dimensions of .lambda./8 by .lambda./12, where .lambda. is the wavelength of the microwave energy in the microwave oven.
11 more elements
A microwave shielding device for a door of a microwave oven, comprising:
- a door frame having a stepped portion formed at one side thereof defining a contact surface for contacting a front plate of the microwave oven when the door is closed;
- and
- a choke seal formed integrally and of one piece with the door frame for preventing leakage of microwave energy from the microwave oven, wherein said choke seal comprises:
- an inner wall extending from the door frame perpendicular to the stepped portion,
- a front wall extending perpendicularly from a distal end portion of the inner wall,
- an outer wall portion extending perpendicularly from a distal end portion of the front wall, and
- a flange extending perpendicularly from a distal end portion of the outer wall and toward the stepped portion;
- wherein a plurality of through-holes are formed in the outer wall and the flange, each said through-hole extending over a boundary between the outer wall and the flange;
- wherein a rectangular aperture is formed in the outer wall between each through-hole;
- wherein a plurality of slits are formed in the flange at positions corresponding to the rectangular apertures formed in the outer wall, each slit communicates with a corresponding one of the rectangular apertures, and the rectangular apertures have dimensions of .lambda./8 by .lambda./12;
- wherein the flange has a pitch of .lambda./4 and a width in the direction normal to the outer wall of .lambda./16, the slits are separated along the flange by a distance of .lambda./6, and the width of each slit in a direction parallel to the outer wall is .lambda./12;
- and
- wherein the through-holes have dimensions in the flange of .lambda./32 by .lambda./12 and dimensions in the outer wall of .lambda./8 and .lambda./12, where .lambda. is the wavelength of the microwave energy in the microwave oven.
10 more elements
Dependencies are inferred from the claim text.