KR101849587B1 - structure for shielding microwave of microwave range - Google Patents

structure for shielding microwave of microwave range Download PDF

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Publication number
KR101849587B1
KR101849587B1 KR1020150150860A KR20150150860A KR101849587B1 KR 101849587 B1 KR101849587 B1 KR 101849587B1 KR 1020150150860 A KR1020150150860 A KR 1020150150860A KR 20150150860 A KR20150150860 A KR 20150150860A KR 101849587 B1 KR101849587 B1 KR 101849587B1
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KR
South Korea
Prior art keywords
microwave
metal layer
holes
microwave oven
present
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KR1020150150860A
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Korean (ko)
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KR20170049930A (en
Inventor
장기석
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020150150860A priority Critical patent/KR101849587B1/en
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/08—Foundations or supports plates; Legs or pillars; Casings; Wheels
    • 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
    • H05B6/6402—Aspects relating to the microwave cavity
    • 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
    • H05B6/6408—Supports or covers specially adapted for use in 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

Abstract

The present invention is characterized in that a plurality of micro-sized holes are formed in a metal layer for shielding electromagnetic waves in a window of a door of a microwave oven and the pitch between the holes is also formed in units of micrometers, And more particularly, to a microwave shielding structure for a microwave oven capable of improving an aperture ratio while maintaining a shielding ratio.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to microwave shielding structures for microwave ovens,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave oven, and more particularly, to a transparent microwave shielding structure for a microwave oven capable of improving the aperture ratio while maintaining a shielding ratio of 50 dB or more for a microwave used in a microwave oven.

Generally, a microwave oven that cooks food as a dielectric heating due to the translational motion of water molecules contained in food by irradiating a microwave to a food, unlike a cookware by heat conduction or thermal radiation, generates electricity due to application of high- The food is cooked by a very high frequency.

At this time, the microwaves can cause rapid heating of food, whereas when the microwave is leaked out of the cooking chamber, cooking efficiency of the microwave oven is lowered. Especially, the microwave harmful to the human body causes damage to the user's body And the like.

FIG. 1 is a view showing an example of a general microwave oven according to the present invention. FIG. 1 is a perspective view illustrating a microwave oven according to an embodiment of the present invention. Referring to FIG. 1, the microwave oven 100 includes a main body 110, An operation panel 130 installed at one end of the door 120 for controlling the operation of the microwave oven and a suction port and a microwave oven 100 for suctioning the outside air, And an exhaust port for discharging the internal air of the exhaust gas outlet to the outside.

A metal layer for blocking microwaves is provided in the sight window of the door 120. A circular hole of a predetermined size is regularly patterned in the metal layer so as to confirm the cooking state of the inner food (food visibility) have.

FIG. 2 is a view showing the structure of a conventional metal layer in which circular holes of regular size are regularly patterned.

That is, as shown in FIG. 2, the conventional metal layer has a thickness of about 1 mm, and a plurality of circular holes having a diameter of about 1.5 mm are regularly (honeycomb) arranged at regular intervals in the metal layer . Here, the pitch of the neighboring circular holes (the distance between the center points of the holes) is 1.9 mm.

Therefore, the diameter of each of the circular holes is about 1.5 mm, which is very small (1.2%) as compared with the microwave wavelength (122 mm, 2.45 GHa) used in the microwave oven. Thus, the metal layer having the plurality of circular holes may have a shielding rate of about 50 dB with respect to the microwave.

However, since the circular hole is very large as compared with the visible light having a wavelength of 400 nm to 700 nm, the visible light transmits to the hole, and the transmittance of the visible light becomes equal to the aperture ratio of the metal layer. Therefore, the user can check the food cooking state inside the microwave oven.

However, the conventional microwave oven has the following problems.

In other words. Conventionally, in order to shield electromagnetic waves, a plurality of circular holes having a diameter of about 1.5 mm are installed at regular intervals (pitch of 1.9 mm) in a door-side window of a microwave oven and regularly arranged metal layers, . However, since the aperture ratio of 57% or more can not be secured, the user can not confirm the food cooking state inside the microwave oven more specifically.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and it is an object of the present invention to provide a microwave oven which has a plurality of micro-sized holes in a metal layer for shielding electromagnetic waves in a window of a door of a microwave oven, It is an object of the present invention to provide a microwave shielding structure for a microwave oven capable of improving the aperture ratio while maintaining a shielding ratio of 50 dB or more for a microwave used in a microwave oven.

According to another aspect of the present invention, there is provided a microwave shielding structure for a microwave oven, comprising: a metal layer formed on a substrate; and a plurality of square holes arranged regularly at regular intervals, have.

Here, the plurality of rectangular holes are arranged in a honeycomb shape or a square shape.

The length of the side of each of the rectangular holes is 9 to 100 탆, and the pitch of neighboring square holes (distance between the center of the holes) is 10 탆 to 110 탆.

According to another aspect of the present invention, there is provided a microwave shielding structure for a microwave oven, comprising: a metal layer formed on a substrate; a plurality of circular holes regularly arranged at regular intervals; The diameter of each of the circular holes is 9 占 퐉 to 100 占 퐉, and the pitch of neighboring circular holes (the distance between the center points of the holes) is 10 占 퐉 to 110 占 퐉.

The plurality of circular holes are arranged in a honeycomb or square shape.

A first transparent conductive layer is further formed on the entire surface of the substrate between the substrate and the metal layer.

A first transparent conductive layer is further formed on the entire surface of the substrate between the substrate and the metal layer, and a second transparent conductive layer is further formed on the entire surface of the substrate including the metal layer.

Herein, a transparent conductive layer is further formed on the entire surface of the substrate including the metal layer.

The transparent microwave shielding structure for a microwave oven according to the present invention having the above-described features has the following effects.

That is, since each hole formed in the metal layer is formed in a micro-size, the aperture ratio can be improved to 80% or more while maintaining a shielding ratio of 50 dB or more for the microwave used in the microwave oven.

In addition, since the metal layer as well as the transparent conductive layer are further formed, the shielding ratio and the aperture ratio for the microwave used in the microwave oven can be further improved.

1 is a view showing an example of a general microwave oven;
FIG. 2 is a view showing the constitution of a conventional metal layer in which circular holes of regular size are regularly patterned
3 is a plan view of a microwave shielding structure for a microwave oven according to a first embodiment of the present invention
4 is a plan view of a microwave shielding structure for a microwave oven according to a second embodiment of the present invention.
5 is a plan view of a microwave shielding structure for a microwave oven according to a third embodiment of the present invention
6 is a plan view of a microwave shielding structure for a microwave oven according to a fourth embodiment of the present invention
7 is a cross-sectional view of a microwave shielding structure for a microwave oven according to a first embodiment of the present invention
8 is a cross-sectional view of a microwave shielding structure for a microwave oven according to a second embodiment of the present invention
9 is a sectional view of a microwave shielding structure for a microwave oven according to a third embodiment of the present invention
10 is a sectional view of a microwave shielding structure for a microwave oven according to a fourth embodiment of the present invention
11 is a graph showing the relationship between the size of holes and the shielding ratio against microwaves in the microwave shielding structure for a microwave oven according to the present invention

The microwave shielding structure for a microwave oven according to the present invention having the above-described features and effects will now be described in more detail with reference to the accompanying drawings.

3 is a plan view of a microwave shielding structure for a microwave oven according to a first embodiment of the present invention.

As shown in FIG. 3, the microwave shielding structure for a microwave oven according to the first embodiment of the present invention is characterized in that a plurality of circular holes each having a diameter of about 9 μm to 100 μm are arranged in a regular interval do.

Here, the pitch of neighboring circular holes (the distance between the center points of the holes) is about 10 μm to 110 μm, and the plurality of circular holes are arranged in a honeycomb shape (hexagonal shape).

4 is a plan view of a microwave shielding structure for a microwave oven according to a second embodiment of the present invention.

The microwave shielding structure for a microwave oven according to the second embodiment of the present invention is characterized in that a plurality of square holes having a length of about 9 mu m to 100 mu m are formed in the metal layer at regular intervals .

Here, the pitch of the neighboring rectangular holes (the distance between the center points of the holes) is about 10 mu m to 110 mu m, and the plurality of square holes are arranged in a honeycomb shape (hexagonal shape).

5 is a plan view of a microwave shielding structure for a microwave oven according to a third embodiment of the present invention.

As shown in FIG. 5, the microwave shielding structure for a microwave oven according to the third embodiment of the present invention is characterized in that a plurality of circular holes having diameters of about 9 μm to 100 μm are arranged in a regular interval do.

Here, the pitch of the neighboring circular holes (the distance between the center points of the holes) is about 10 μm to 110 μm, and the plurality of circular holes are arranged in a rectangular shape.

6 is a plan view of a microwave shielding structure for a microwave oven according to a fourth embodiment of the present invention.

6, the microwave shielding structure for a microwave oven according to the fourth embodiment of the present invention is characterized in that a plurality of rectangular holes having a length of about 9 mu m to 100 mu m are formed in the metal layer at regular intervals .

Here, the pitch of the neighboring rectangular holes (the distance between the center points of the holes) is about 10 μm to 110 μm, and the plurality of square holes are arranged in a rectangular shape.

In the microwave shielding structure for a microwave oven according to the first to fourth embodiments of the present invention, the diameter of the circular hole or the length of the side of the rectangular hole is set to 55 μm, and the pitch of the adjacent holes is set to 60 μm And the aperture ratio of 85% or more while maintaining a shielding ratio of 50 dB or more with respect to the microwave when the diameter of the circular hole or the length of the sides of the rectangular hole is 75 μm and the pitch of the neighboring holes is 80 μm. Respectively.

On the other hand, when a transparent conductive layer such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide) is formed as well as a metal layer on the door of the microwave oven as described above, the shielding ratio and the aperture ratio Respectively.

7 is a cross-sectional view of a microwave shielding structure for a microwave oven according to a first embodiment of the present invention.

7, a cross section of a microwave shielding structure for a microwave oven according to a first embodiment of the present invention includes a metal layer (for example, Cu) and a photoresist layer (not shown) on a substrate such as a microwave oven door, (Not shown in the figure) is deposited on the substrate and photolithographic is used to selectively remove the metal layer to form a plurality of holes as shown in FIGS. 3 to 6. The photolithography is a well-known technique widely used in semiconductor processing.

8 is a cross-sectional view of a microwave shielding structure for a microwave oven according to a second embodiment of the present invention.

That is, as shown in FIG. 8, the cross section of the microwave shielding structure for a microwave oven according to the second embodiment of the present invention is formed by forming a transparent conductive layer such as ITO or IZO on the entire surface of a substrate such as a microwave oven door do.

Then, a metal layer (for example, Cu) and a photoresist film (not shown in the figure) are deposited on the transparent conductive layer, and the metal layer is selectively removed by photolithography, Similarly, a plurality of holes are formed.

9 is a cross-sectional view of a microwave shielding structure for a microwave oven according to a third embodiment of the present invention.

9, a cross section of a microwave shielding structure for a microwave oven according to a third embodiment of the present invention includes a metal layer (for example, Cu) and a photoresist layer (not shown) on a substrate of a material such as a microwave oven door, (Not shown in the figure) is deposited on the substrate and photolithographic is used to selectively remove the metal layer to form a plurality of holes as shown in FIGS. 3 to 6.

A transparent conductive layer such as ITO or IZO is formed on the entire surface of the substrate including the metal layer on which the plurality of holes are formed.

10 is a plan view of a microwave shielding structure for a microwave oven according to a fourth embodiment of the present invention, and is a structural cross-sectional view of the microwave oven door.

10, a cross section of a microwave shielding structure for a microwave oven according to a fourth embodiment of the present invention includes a first transparent conductive layer such as ITO or IZO on the entire surface of a substrate such as a microwave oven door, .

A metal layer (for example, Cu) and a photoresist film (not shown in the figure) are deposited on the first transparent conductive layer, and the metal layer is selectively removed by photolithography, Similarly, a plurality of holes are formed.

A second transparent conductive layer such as ITO or IZO is formed on the entire surface of the substrate including the metal layer on which the plurality of holes are formed.

In the section of the microwave shielding structure for a microwave oven according to the first to fourth embodiments of the present invention described above, a plurality of holes are formed in the metal layer using photolithographic techniques, It does not.

That is, a metal layer having a plurality of micro-sized holes may be printed on a substrate by using a metal mesh printing method.

As described above, in the microwave shielding structure for microwave oven according to each embodiment of the present invention, the shielding rate for microwaves used in the microwave oven according to the size of the holes is as shown in Fig.

11 is a graph showing the relationship between the size of holes and the shielding ratio against microwaves in the microwave shielding structure for a microwave oven according to the present invention.

As can be seen from FIG. 11, if the size of each hole is 100 m (0.1 mm) or less, it can be confirmed that the shielding ratio against microwaves is 50 dB or more.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of.

1: substrate 2: metal layer
3, 4; The transparent conductive layer

Claims (11)

A metal layer formed on the substrate,
And a first transparent conductive layer formed on the substrate or the metal layer,
And a plurality of rectangular holes arranged regularly at regular intervals in the metal layer,
Wherein a length of the side of each of the rectangular holes is 9 to 100 탆 and a pitch of adjacent square holes (distance between center points of the hole) is 10 to 110 탆. The method according to claim 1,
Wherein the plurality of rectangular holes are arranged in a honeycomb shape. The method according to claim 1,
Wherein the plurality of rectangular holes are arranged in a rectangular shape. delete A metal layer formed on the substrate,
And a plurality of circular holes arranged regularly at regular intervals in the metal layer,
Wherein the diameter of each of the circular holes is 9 占 퐉 to 100 占 퐉 and the pitch of the neighboring circular holes (distance between the center points of the holes) is 10 占 퐉 to 110 占 퐉. 6. The method of claim 5,
Wherein the plurality of circular holes are arranged in a honeycomb or square shape. 7. The method according to any one of claims 5 to 6,
And a first transparent conductive layer is further formed on the entire surface of the substrate between the substrate and the metal layer. 8. The method of claim 7,
And a second transparent conductive layer is further formed on the entire surface of the substrate including the metal layer. 7. The method according to any one of claims 5 to 6,
Wherein a transparent conductive layer is further formed on the entire surface of the substrate including the metal layer. 4. The method according to any one of claims 1 to 3,
Wherein the first transparent conductive layer is formed between the substrate and the metal layer, and a second transparent conductive layer is further formed on the entire surface of the substrate including the metal layer. 4. The method according to any one of claims 1 to 3,
Wherein the first transparent conductive layer is formed on the entire surface of the substrate including the metal layer.
KR1020150150860A 2015-10-29 2015-10-29 structure for shielding microwave of microwave range KR101849587B1 (en)

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KR1020150150860A KR101849587B1 (en) 2015-10-29 2015-10-29 structure for shielding microwave of microwave range

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KR101849587B1 true KR101849587B1 (en) 2018-04-17

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014138058A (en) * 2013-01-16 2014-07-28 Panasonic Corp Electromagnetic wave shield

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014138058A (en) * 2013-01-16 2014-07-28 Panasonic Corp Electromagnetic wave shield

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