EP3701771A1 - Tür für ein haushalts-mikrowellengerät - Google Patents
Tür für ein haushalts-mikrowellengerätInfo
- Publication number
- EP3701771A1 EP3701771A1 EP18782724.1A EP18782724A EP3701771A1 EP 3701771 A1 EP3701771 A1 EP 3701771A1 EP 18782724 A EP18782724 A EP 18782724A EP 3701771 A1 EP3701771 A1 EP 3701771A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- door
- grid
- micrometers
- micro
- microwave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/6414—Aspects relating to the door of the microwave heating apparatus
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/76—Prevention of microwave leakage, e.g. door sealings
- H05B6/766—Microwave radiation screens for windows
Definitions
- the invention relates to a door for a household microwave oven, comprising at least one perforated electrically conductive grid, in particular metal grid, which covers a viewing opening of the door and has a plurality of micro-chambers arranged in a regular pattern.
- the invention also relates to a household microwave oven with such a door.
- the invention is particularly advantageously applicable to self-contained domestic microwave ovens and ovens with microwave function.
- US 3679855 A, DE 32 31 516 A1 and EP 0 042 616 B1 disclose a door for a microwave oven having a self-contained perforated metal grid covering a viewing opening of the door and having a plurality of circular holes arranged in a regular pattern.
- WO 2016/179317 A1, US 4010343 A or EP 2 020 827 B1 disclose a shield for a viewing opening of a door of a microwave oven in the form of a metallic net.
- DE 39 23 734 C1 disclose glass windows for doors of microwave appliances, which are provided with a thin-film shield, e.g. made of aluminum, copper, tin, tin oxide, carbon nanotubes, etc. are coated.
- a thin-film shield e.g. made of aluminum, copper, tin, tin oxide, carbon nanotubes, etc. are coated.
- DE 102 014 23 A1 discloses an electrically conductive coating in the viewing area as a shield, wherein the coating is strip-shaped or diamond-shaped.
- EP 0 503 899 B1 discloses a microwave screen for a viewing opening of a door of a microwave oven in the form of a layered grid.
- the thickness of the grid is about 0.2 microns.
- Most used metal grids in household microwave ovens have arranged in a triangular pattern round holes, which have a diameter of about 1, 5 mm and are arranged with a pitch of about 2.5 mm. It is the object of the present invention to overcome the disadvantages of the prior art at least partially, and in particular to provide a microwave-tight shield for a viewing opening of a door of a microwave oven, which has a particularly advantageous combination of properties: prevention of leakage of microwave radiation from the viewing port, keeping low from microwave losses in the shield and good optical visibility through the shield.
- a door for a household microwave oven comprising at least one perforated electrically conductive grid covering a viewing opening of the door and having a plurality of microholes arranged in a regular pattern, the microholes having a rectangular basic shape with rounded corners.
- This door has the advantage that microwave losses in the shield are kept particularly low and a good optical transparency for a viewer in front view and a very good attenuation against a passage of microwaves can be maintained.
- the rounded corners cause a reduction in the electric current density induced by the microwaves compared with a sharp or sharp corner, which reduces microwave losses.
- This also results in the advantage that a reliability of an electrical connection is increased across different areas of the grid. This in turn prevents an aging-related reduction of the shielding effect.
- the rounded corners can also be referred to as defined radii, since the curves are introduced or produced with at least one predetermined radius.
- the perforation of the grid is effected by the micro-holes.
- Microholes can generally be understood as meaning holes which have a width (for example represented by a diameter or an edge length) in the sub-millimeter range.
- the grating may in principle be designed as a stand-alone, e.g. prefabricated grid present.
- the grid is a metal grid.
- the metal grid can be made entirely of metal such as steel, aluminum and / or copper, etc., or be metal coated.
- the metal may e.g. Steel or aluminum and / or copper (e.g., in the form of a mixture or alloy).
- the use of a metal grid has the advantage that the micro-holes can be produced with low production costs and with particular precision.
- the grid may be made of carbon nanotubes or other electrically conductive material, e.g. from carbon nanotubes, electrically conductive ceramics, etc.
- the viewing opening of the door can be covered by exactly one grid or by several gratings arranged one behind the other.
- the viewing aperture of the door may in particular be covered by two gratings, e.g. are arranged on a front side and on a rear side of a viewing pane.
- two gratings e.g. are arranged on a front side and on a rear side of a viewing pane.
- the microholes of several grids have the same shape and / or size. It is particularly advantageous if the plurality of grids have identically shaped and arranged micro holes or patterns.
- a rectangular basic shape can be understood to mean a shape which is a rectangular shape except for the rounded corners. It is a development that the rectangular basic shape is a square basic shape, which allows a particularly uniform distribution of the current density in the grid.
- the at least one perforated grid is a layer applied to a transparent door pane.
- a sheet-like metal grid is advantageously made of aluminum and / or copper or alloys thereof to to obtain a particularly low ohmic resistance, which in turn is advantageous for a good shielding performance and low losses.
- the grid is in the form of a printed electrically conductive paint.
- the grid is a micro contact printed grid or has been applied by means of a micro contact printing.
- the microcontact printing gives the advantage that micrometer-sized patterns can be easily applied to the door glass. This can be advantageously carried out without using a clean room.
- a single "master" stamp multiple identical stamps can be made. The stamps can be used many times to make prints with very little wear. In addition, only little energy is used to produce the prints.
- the grid is a vapor-deposited grid.
- CVD chemical vapor deposition
- PVD physical vapor deposition
- the grid is a sputtered grid.
- a magnetron sputtering can be used.
- Magnetron sputtering may use a guided beam or mask to apply the grating.
- an electrically conductive pattern can first be applied to a door pane and, if necessary, subsequently the layer thickness thereof can be increased, e.g. by electroless plating.
- the materials of microcontact printing and electroplating may differ.
- the grid can consist practically only of the electrodeposited material.
- the door pane can be a glass pane or a plastic pane.
- the predetermined radius of the rounded corners is between 7 microns and 15 microns. This has proven to be a range of values that is particularly advantageous for reducing local current density peaks in the corners. like and at the same time to keep an area of the microholes large for a good transparency.
- a cumulative layer thickness of the at least one perforated grid is between 2 microns and 5 microns. This refinement is based on the recognition that, with layer thicknesses of more than five micrometers, a precision of the introduction of the microholes is markedly reduced. This in turn degrades a targeted, uniform reduction in current density peaks and can lead to local variations in optical clarity. On the other hand, it has been found that, with cumulative layer thicknesses of less than two micrometers, the ohmic resistance decreases so much that losses in the grid and / or leakage of microwaves through the grid increase markedly.
- a “cumulative" layer thickness is understood to mean its layer thickness in the presence of exactly one microwave-shielding grating. If there are several microwave-screening grids arranged one behind the other on the door in front view, the "cumulated" layer thickness is understood to mean the added or common layer thickness of all grids. It is an embodiment that the at least one perforated grid is exactly one grid whose layer thickness is between 2.5 micrometers and 5 micrometers. This results in the advantages described above for exactly one grid. For a single layered grid of copper, e.g. a layer thickness between 2.5 microns and 5 microns be particularly advantageous. For a single layered grid of aluminum, e.g. a layer thickness of about three microns be particularly advantageous.
- the at least one perforated grid has a plurality of frontally arranged on the door one behind the other grid whose cumulative layer thickness is between 2 microns and 5 microns.
- the upper limit of five microns remains, for example, due to manufacturing tolerances in the positioning of the grid on a lens, resulting in a lateral offset of the Grid can lead to each other, which in turn deteriorates an optical transparency.
- microholes are arranged in a rectangular matrix shape. This gives the advantage that particularly low current density peaks can be achieved.
- a rectangular matrix form may, in particular, be understood to mean a shape of an arrangement in which the microholes are arranged uniformly along imaginary rows and columns running rectangularly therefrom.
- the microholes of adjacent rows or columns have, for example, in contrast to a triangular pattern, no longitudinal offset from one another.
- the rectangular matrix form may be a square matrix form in which a spacing of the rows and columns or the microholes along the columns and along rows is the same. This advantageously causes a particularly uniform distribution of the current density in the grid.
- the particularly uniform distribution of the current density in the grid is also supported by the fact that the edges of the microholes run in particular parallel to the rows and columns, that is, in the pattern are not arranged in the manner of diamonds.
- a width of the microholes-limiting strip areas of the grid is at least three times, in particular at least four times, as large as a thickness of the grid. This results in the advantage that a particularly uniform width of the strip areas of the grid can be achieved, which further reduces an inhomogeneous current density distribution in the strip areas and thus a risk of damage to the grid.
- a "strip area" of the grid may, in particular, be understood to mean a strip of material of the grid having parallel, rectilinear longitudinal sides whose longitudinal sides adjoin the microholes.
- the width of the material strip corresponds to a next distance of directly adjacent microholes of adjacent rows or columns of the matrix pattern.
- the width of the strips of material of the columns (“vertical” strips of material) and the width of the strips of material of the lines (“horizontal” strips of material) may differ.
- its width is the same.
- This embodiment is particularly advantageous in conjunction with the cumulative layer thickness between 2 micrometers and 5 micrometers, since with larger layer thicknesses and correspondingly enlarged micro-holes, the leakage of microwaves through the grid increases again. The reason for this may be that a higher conductivity of the grating can not compensate for increased transmission of the grating for microwaves due to enlarged microholes.
- a width of the strip areas of the grid is not more than five times, in particular not more than four times, as large as a thickness of the grid. This provides the advantage that visibility is particularly high.
- a pitch of adjacent microholes is between 50 microns and 100 microns. This embodiment has the advantage that a particularly advantageous compromise between good visibility, low losses and high shielding results.
- a "pitch" of adjacent microholes may, in particular, be understood to mean a center-to-center spacing of directly adjacent (ie not obliquely arranged) microholes. In a rectangular matrix pattern, the pitch may vary along the columns and the pitch along the rows. In a square matrix pattern, their pitch is the same.
- the microholes have an edge length between 30 micrometers and 100 micrometers, in particular between 40 micrometers and 75 micrometers. Such edge length allows good visibility, especially in the entire optical spectrum. For example, shorter edge lengths can result in significant refraction of the light at the edges of the microholes. Higher edge lengths can lead to a loss of visual homogeneity.
- An edge length can be understood in particular to mean a full height or width of the microholes.
- the household microwave oven is a dedicated microwave oven ("stand-alone appliance").
- the household microwave oven is a combination microwave oven.
- the microwave combination device may in particular be an oven with a microwave function.
- the door is then a microwave-tight oven door.
- the object is also achieved by a household microwave oven having such a door.
- the household microwave oven can be made analogous to the door and has the same advantages.
- the object is further achieved by a viewing window as described above.
- FIG. 1 shows a front view of a section of a door according to the invention
- Figure 2 shows a front view of an enlarged section of the grid of the door
- FIG. 1 shows a front view of a detail of a door 1 according to the invention of a microwave oven G with a viewing window 2 in the form of e.g. transparent plastic or glass sheet 3, which is coated on a surface with a perforated metal mesh 4 in layer form.
- the metal grid 4 may e.g. made of aluminum or copper.
- the metal grid 4 has microholes 5 arranged in its perforation in a regular square matrix pattern.
- the micro-holes 5 have a square basic shape with rounded corners.
- the corners have a predetermined radius R, as shown in Fig.2.
- the radius R is here between 7 micrometers and 15 micrometers, while an edge length K of the micro-holes 5 may be in particular between 40 micrometers and 75 micrometers.
- a pitch L of adjacent micro-holes is in particular between 50 micrometers and 100 micrometers.
- a width W1, W2 of the vertical microstrip 5 bounding vertical stripe regions 6 and horizontal stripe regions 7 of the metal grid 4 is at least three times, in particular four times, as large as a (perpendicular to the leaf level caking) layer thickness of the metal grid 4, which is between 2.5 microns and 5 microns.
- the latitudes are the same here, but in principle can be different.
- the following variants of the metal grid 4 can be used:
- a number may include exactly the specified number as well as a usual tolerance range, as long as this is not explicitly excluded. LIST OF REFERENCE NUMBERS
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electric Ovens (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017218832.4A DE102017218832A1 (de) | 2017-10-23 | 2017-10-23 | Tür für ein Haushalts-Mikrowellengerät |
| PCT/EP2018/076949 WO2019081171A1 (de) | 2017-10-23 | 2018-10-04 | Tür für ein haushalts-mikrowellengerät |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3701771A1 true EP3701771A1 (de) | 2020-09-02 |
| EP3701771B1 EP3701771B1 (de) | 2025-06-25 |
Family
ID=63787953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18782724.1A Active EP3701771B1 (de) | 2017-10-23 | 2018-10-04 | Tür für ein haushalts-mikrowellengerät |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11528784B2 (de) |
| EP (1) | EP3701771B1 (de) |
| CN (1) | CN111226502B (de) |
| DE (1) | DE102017218832A1 (de) |
| WO (1) | WO2019081171A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11849526B2 (en) | 2020-03-31 | 2023-12-19 | Midea Group Co., Ltd. | Microwave cooking appliance with increased visibility into the cavity |
| US11770882B2 (en) | 2020-03-31 | 2023-09-26 | Midea Group Co., Ltd. | Microwave cooking appliance with user interface display |
| US20230036961A1 (en) * | 2021-07-20 | 2023-02-02 | Metamaterial Inc. | Microwave device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54179960U (de) * | 1978-06-07 | 1979-12-19 |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3177334A (en) * | 1963-03-11 | 1965-04-06 | Gen Electric | Oven door window |
| US3679855A (en) | 1971-06-11 | 1972-07-25 | Gen Electric | Protective barriers for window of microwave oven door |
| JPS5425667B2 (de) * | 1974-06-14 | 1979-08-29 | ||
| JPS517758U (de) * | 1974-07-03 | 1976-01-20 | ||
| CA1038045A (en) | 1974-12-09 | 1978-09-05 | Junzo Tanaka | Transparent shielded door screen for microwave oven |
| US4292488A (en) | 1980-06-25 | 1981-09-29 | Litton Systems, Inc. | Microwave oven door having a conformable screen |
| DE3231516A1 (de) | 1982-08-25 | 1984-03-01 | Schott Glaswerke, 6500 Mainz | Glas- und/oder glaskeramik-verbundsystem zur abschirmung gegen mikrowellenstrahlung |
| DE3923734C1 (en) | 1989-07-18 | 1990-08-16 | Dornier Gmbh, 7990 Friedrichshafen, De | Microwave furnace window - has tin oxide, indium coating |
| JP3204677B2 (ja) | 1991-03-14 | 2001-09-04 | 株式会社東芝 | 電子レンジ |
| US5981927A (en) * | 1996-12-13 | 1999-11-09 | Osepchuk; John | High visibility microwave oven door with screen and microwave absorbing material |
| DE10307217B4 (de) | 2003-02-20 | 2006-04-13 | Schott Ag | Tür mit Sichtfenster für Mikrowellengeräte |
| JP2005273977A (ja) * | 2004-03-24 | 2005-10-06 | Hitachi Home & Life Solutions Inc | 加熱調理器 |
| ES2436106T3 (es) | 2007-07-03 | 2013-12-27 | Whirlpool Corporation | Sistema de blindaje para microondas y horno microondas que utiliza este sistema de blindaje |
| CN102003727B (zh) * | 2010-12-08 | 2015-05-20 | 广东格兰仕微波炉电器制造有限公司 | 微波炉微波屏蔽结构 |
| US9415854B2 (en) | 2011-09-14 | 2016-08-16 | Mitsubishi Aircraft Corporation | Aircraft window and aircraft having an electromagnetic shield |
| CN203442932U (zh) | 2013-07-28 | 2014-02-19 | 合肥市宏键精工模具有限责任公司 | 超高透光型微波炉屏蔽网板 |
| CN203893281U (zh) | 2014-04-17 | 2014-10-22 | 合肥市宏键精工模具有限责任公司 | 一种高透光型微波炉屏蔽网板 |
| DE102014210668A1 (de) | 2014-06-05 | 2015-12-17 | BSH Hausgeräte GmbH | Haushaltsgerät mit Speisenbehandlungsraum und Kamera |
| CN204345763U (zh) * | 2014-11-21 | 2015-05-20 | 合肥市宏键精工模具有限责任公司 | 一种微波炉用高透光屏蔽网板 |
| WO2016179317A1 (en) | 2015-05-05 | 2016-11-10 | Dynamo Aviation, Inc. | Microwave oven providing a tortuous path door seal |
| CN106211407A (zh) * | 2016-08-25 | 2016-12-07 | 郑州峰泰纳米材料有限公司 | 微波炉的炉门 |
| EP3525551A1 (de) * | 2018-02-13 | 2019-08-14 | SABIC Global Technologies B.V. | Transparente elektromagnetische abschirmplatten und anordnungen damit |
-
2017
- 2017-10-23 DE DE102017218832.4A patent/DE102017218832A1/de not_active Withdrawn
-
2018
- 2018-10-04 US US16/756,501 patent/US11528784B2/en active Active
- 2018-10-04 EP EP18782724.1A patent/EP3701771B1/de active Active
- 2018-10-04 CN CN201880068891.0A patent/CN111226502B/zh active Active
- 2018-10-04 WO PCT/EP2018/076949 patent/WO2019081171A1/de not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54179960U (de) * | 1978-06-07 | 1979-12-19 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019081171A1 (de) | 2019-05-02 |
| CN111226502A (zh) | 2020-06-02 |
| EP3701771B1 (de) | 2025-06-25 |
| US20200288544A1 (en) | 2020-09-10 |
| US11528784B2 (en) | 2022-12-13 |
| DE102017218832A1 (de) | 2019-04-25 |
| CN111226502B (zh) | 2022-05-13 |
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