US4476362A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency heating apparatus
Assignee: Panasonic Holdings Corp
•
Filing: 1983-01-24
•
Granted: 1984-10-09
•
Expires: 2003-01-24
Abstract
Abstract The present invention is a high frequency heating apparatus which has a high frequency oscillator for radiating high frequency energy when energized by a high voltage, a waveguide for propagating the high frequency energy from the high frequency oscillator to a heating cavity or heating chamber of the apparatus in which an object to be heated is placed, and an electric wave radiating member provided between and extending into the waveguide and the heating chamber. The electric wave radiating member both couples, through electric waves, the waveguide with the heating chamber and also radiates the high frequency energy into the heating chamber for uniform heat distribution within the heating chamber.
Inventors
- 👤 Shigeru Kusunoki
- 👤 Hirofumi Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:16
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/64; H05B6/72
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
343 words
A high frequency heating apparatus comprising: a heating cavity for placing therein an object to be heated, said heating cavity being formed in a substantially cubic box-like configuration and having a set of horizontal walls and a set of vertical walls; an electric wave supplying means for supplying electric waves of a predetermined frequency into said heating cavity, said electric wave supplying means having a high frequency oscillator for producing said electric waves; a waveguide mounted on one of said set of horizontal walls and extending along said wall, said waveguide being interconnected with said heating cavity through an aperture which is provided at a center portion of said wall and having dimensions which are smaller than 1/2 wavelength of said frequency of said electric waves from said high frequency oscillator so as to prevent a loose coupling of electric waves between said waveguide and said heating cavity when no object is within said aperture; an electric wave coupling means provided between said heating cavity and said waveguide passing through said aperture and having an insulating material for separating said electrical wave coupling means from said heating cavity and said waveguide, said coupling means having a substantially non-symmetric configuration and having a receiving portion arranged within said waveguide for receiving said electric waves and having a rotatable radiating L shaped portion arranged within said heating cavity, said L shaped portion being an end portion which substantially extends along said horizontal wall and is connected to said receiving portion through said aperture for radiating said electric waves received by said receiving portion into said heating chamber in a uniform heat distribution by the periodic variation of an electric wave radiation pattern; a support member for rotatably supporting said electric wave coupling means; a driving means for rotating said radiating portion of said electric wave coupling means; and, a dielectric member disposed between said heating cavity and said waveguide within said aperture for preventing passage of unwanted matter from entering said waveguide yet allowing passage of said electric waves from said electric wave coupling means.
Claim 2
Dependent Claim
343 words
A high frequency heating apparatus comprising: a heating cavity for placing therein an object to be heated, said heating cavity being formed in a substantially cubic box-like configuration and having a set of horizontal walls and a set of vertical walls; an electric wave supplying means for supplying electric waves of a predetermined frequency into said heating cavity, said electric wave supplying means having a high frequency oscillator for producing said electric waves; a waveguide mounted on one of said set of horizontal walls and extending along said wall, said waveguide being interconnected with said heating cavity through an aperture which is provided at a center portion of said wall and having dimensions which are smaller than 1/2 wavelength of said frequency of said electric waves from said high frequency oscillator so as to prevent a loose coupling of electric waves between said waveguide and said heating cavity when no object is within said aperture; an electric wave coupling means provided between said heating cavity and said waveguide passing through said aperture and having an insulating material for separating said electrical wave coupling means from said heating cavity and said waveguide, said coupling means having a substantially non-symmetric configuration and having a receiving portion arranged within said waveguide for receiving said electric waves and having a rotatable radiating L shaped portion arranged within said heating cavity, said L shaped portion being an end portion which substantially extends along said horizontal wall and is connected to said receiving portion through said aperture for radiating said electric waves received by said receiving portion into said heating chamber in a uniform heat distribution by the periodic variation of an electric wave radiation pattern; a support member for rotatably supporting said electric wave coupling means; a driving means for rotating said radiating portion of said electric wave coupling means; and, a dielectric member disposed between said heating cavity and said waveguide within said aperture for preventing passage of unwanted matter from entering said waveguide yet allowing passage of said electric waves from said electric wave coupling means.
Claim 3
Dependent Claim
91 words
A high frequency heating apparatus as claimed in claim 1, further comprising: a blower means for causing a flow of air; a duct means coupled to said blower means for causing said flow of air to pass and cool said high frequency oscillator and then to pass said radiating portion of said electric wave coupling means; wherein said driving means comprises an impeller means connected to said radiating portion of said electric wave coupling means for causing said radiating portion to rotate when said flow of air passes said radiating portion.
Claim 4
Dependent Claim
32 words
A high frequency heating apparatus as claimed in claim 1, wherein said radiating portion of said electric wave coupling means comprises an antenna having a dielectric material with a metallic surface coating.
Claim 5
Dependent Claim
49 words
A high frequency heating apparatus as claimed in claim 1, wherein the size and shape of said heating chamber and said frequency of said electric waves from said high frequency oscillator are selected such that said radiating portion of said electric wave coupling means excites complementary mode standing waves.
Claim 6
Dependent Claim
50 words
A high frequency heating apparatus as claimed in claim 1, wherein the size and shape of said heating chamber and said frequency of said electric waves from said high frequency oscillator are selected such that said radiating portion of said electric wave coupling means does not excite any resonant modes.
Claim 7
Dependent Claim
38 words
A high frequency heating apparatus as claimed in claim 1, wherein said aperture has a circular shape with a diameter which is less than 1/2 wavelength of said frequency of said electric waves from said high frequency oscillator.
Claim 8
Dependent Claim
35 words
A frequency heating apparatus as claimed in claim 1, wherein said receiving portion of said electric wave coupling means comprises a straight rod having a circular cross-section at its extreme and extending into said waveguide.
Claim 9
Dependent Claim
49 words
A high frequency heating apparatus as claimed in claim 1, wherein said receiving portion of said electric wave coupling means comprises a straight rod having at its extreme and extending into said waveguide an inverted cone shape, the base of said cone facing a corresponding wall of said waveguide.
Claim 10
Dependent Claim
33 words
A high frequency heating apparatus as claimed in claim 1, further comprising a stirrer means for random scattering of high frequency energy radiated by said radiating portion of said electric wave coupling means.
Claim 11
Dependent Claim
29 words
A high frequency heating apparatus as claimed in claim 1, wherein said radiating portion of said electric wave coupling means comprises an antenna in the form of a rod.
Claim 12
Dependent Claim
129 words
A high frequency heating apparatus as claimed in claim 10, wherein said antenna comprises a first antenna portion having a length which is less than 1/4 wavelength of said frequency of said electric waves from said high frequency oscillator and is arranged to be perpendicular to said wall of said heating chamber having said aperture; and wherein said antenna further comprises a second antenna portion which is arranged to be parallel to said wall of said heating chamber having said aperture and wherein said antenna still further comprises a third antenna portion having a length which is at least 1/4 wavelength of said frequency of said electric waves from said high frequency oscillator and is arranged to be perpendicular to said wall of said heating chamber having said aperture.
Claim 13
Dependent Claim
45 words
A high frequency heating apparatus as claimed in claim 1, further comprising a high frequency energy reflecting means associated with said radiating portion of said electric wave coupling means for reflecting high frequency energy radiated by said radiating portion of said electric wave coupling means.
Claim 14
Dependent Claim
49 words
A high frequency heating apparatus as claimed in claim 12, further comprising a reflector rotation means connected to said high frequency energy reflecting means for causing said high frequency energy reflecting means to rotate in synchronism with the rotation of said radiating portion of said electric wave coupling means.
Claim 15
Dependent Claim
48 words
A high frequency heating apparatus as claimed in claim 12 further comprising a reflector rotation means connected to said high frequency energy reflecting means for causing said high frequency energy reflecting means to rotate independently of the rotation of said radiating portion of said electric wave coupling means.
References Cited (Backward Citations)
US2526226A
Cited
US2767291A
Cited
US2961520A
Cited
US3265780A
Cited
US3436507A
Cited
US3493709A
Cited
US3643055A
Cited
US3705283A
Cited
US3798404A
Cited
US3851133A
Cited
GB1439260A
Cited
DE2450904A1
Cited
US3843862A
Cited
US3855440A
Cited
US3939320A
Cited
US4028521A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |