Transparent electromagnetic shielding window of microwave oven based on metal grid conductive film

Abstract

The utility model discloses a microwave oven transparent electromagnetic shielding window based on a metal grid conductive film, which comprises a door frame and an observation window, the observation window comprises a cover plate, an optical adhesive layer and a metal grid layer, and the metal grid layer is attached to the cover plate through the optical adhesive layer; the line width of the metal grid layer prepared by adopting the yellow light subtraction etching process is 1-30 microns, the grid can be rhombic, square or hexagonal, the metal grid layer is attached to the cover plate through the optical adhesive layer to form the observation window which is integrated into the door frame of the microwave oven, microwaves can be shielded by the metal grid layer, and the microwave oven is not damaged. The microwave oven has the advantages that microwave leakage is avoided, high visibility of the observation window is realized under the condition that the microwave oven has an effective microwave shielding function, and a user can conveniently observe the food heating condition.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave ovens, and more specifically, particularly relates to a transparent electromagnetic shielding window for microwave ovens based on a metal grid conductive film. Background Art

[0002] When the microwave generator is working, it will generate microwave radiation, which will be blocked by the metal cavity and will not leak out. Traditional microwave oven doors need to be transparent to facilitate observation of the state of heated items. In order to effectively shield microwaves, traditional microwave oven observation windows are usually coated with microwave absorbing materials or microwave reflecting materials. These materials do not have visible light transmittance in the visible light region. Therefore, traditional microwave oven observation windows generally have the optical characteristics of low light transmittance and high haze, which makes it impossible for users to clearly observe the shape of heated items. Utility Model Content

[0003] The utility model provides a microwave oven transparent electromagnetic shielding window based on a metal mesh conductive film to solve the problems raised in the above background technology. To achieve the above purpose, the utility model provides the following technical solutions: a microwave oven transparent electromagnetic shielding window based on a metal mesh conductive film, comprising a door frame and an observation window, the observation window comprising a cover plate, an optical adhesive layer and a metal mesh layer, the metal mesh layer being bonded to the cover plate through the optical adhesive layer; the metal mesh layer comprising a plurality of metal wires, the plurality of metal wires being distributed in a grid shape.

[0004] Preferably, the shape of the grid formed by the plurality of metal wires is rhombus, square or hexagon.

[0005] Preferably, the wire width of the metal wire is 1-30 μm, more preferably 5-15 μm.

[0006] Preferably, the metal grid layer is formed by yellow light subtractive etching.

[0007] Preferably, the metal grid layer is made of copper metal.

[0008] Preferably, the transmittance of the observation window is greater than 85%, more preferably 90%.

[0009] Preferably, a sensor and an alarm device are also included; the two sides of the metal grid layer are conductive areas, and the conductive areas are connected to the sensor through FPC cables; the sensor detects the resistance change of the metal grid layer and is connected to the alarm device.

[0010] Preferably, the door frame further comprises a door closing detection switch, wherein the door closing detection switch is connected to the alarm.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model adopts a yellow light subtractive etching process to prepare a metal grid layer, the line width of which is between 5-15μm, and the shape of the grid can be a rhombus, a square or a hexagon. The metal grid layer is bonded to the cover plate through an optical adhesive layer to form an observation window integrated into the door frame of the microwave oven. Microwaves can be shielded by the metal grid layer and will not cause microwave leakage, so that the microwave oven can achieve high visibility of the observation window while having an effective microwave shielding function, making it convenient for users to observe the heating of food. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of a transparent electromagnetic shielding window for a microwave oven based on a metal grid conductive film according to an embodiment of the utility model;

[0013] Figure 2 This is a rendering of the stacked structure of a transparent electromagnetic shielding window for a microwave oven based on a metal grid conductive film according to an embodiment of the utility model;

[0014] Figure 3 The metal mesh layer structure of the transparent electromagnetic shielding window of a microwave oven based on a metal mesh conductive film according to an embodiment of the utility model is schematically shown;

[0015] exist Figures 1 to 3 In the figure, the corresponding relationship between the names of the components and the numbers of the drawings is as follows:

[0016] 1--door frame, 2--observation window, 21--cover plate, 22--optical adhesive layer, 23--metal mesh layer, 231--metal wire. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0018] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] Please refer to Figures 1 to 3 The utility model provides a transparent electromagnetic shielding window for a microwave oven based on a metal mesh conductive film, comprising a door frame 1 and an observation window 2, wherein the observation window 2 comprises a cover plate 21, an optical adhesive layer 22 and a metal mesh layer 23, wherein the metal mesh layer 23 is bonded to the cover plate 21 through the optical adhesive layer 22; the metal mesh layer 23 comprises a plurality of metal wires 231, and the plurality of metal wires 231 are distributed in a grid shape.

[0021] In addition to being coated with microwave absorbing materials or microwave reflecting materials, the doors of traditional microwave ovens also use metal mesh for microwave shielding. Such metal mesh is generally made of punched metal plates. Due to the limitations of the thickness of the metal plates and the punching process, the mesh size of the metal mesh is relatively small. When users use the microwave oven to heat food, they cannot observe the state of the food in the cavity of the microwave oven through the door.

[0022] In the embodiment of the utility model, the cover plate 21 is made of highly transparent tempered glass, and the metal mesh layer 23 is bonded to the cover plate 21 by an optical adhesive layer 22. The optical adhesive layer 22 can protect the integrity of the metal mesh layer 23, so that the metal mesh layer 23 is not easily damaged during repeated opening and closing of the door and daily use. In order to improve the visual effect and transmittance, the metal mesh layer 23 in this embodiment is made by etching. The mesh shape and line width in the metal mesh layer 23 are controlled by a high-precision etching process to ensure the effective microwave shielding function. The transmittance is increased as much as possible to enhance the user experience. In addition to being applied to the field of microwave ovens, this embodiment can also be applied to other similar electromagnetic shielding films or electromagnetic shielding glass application fields.

[0023] Preferably, the shape of the grid formed by the plurality of metal wires 231 is a rhombus, a square or a hexagon. Through the above structural design, a suitable grid shape can be selected according to the size, size and power of the microwave oven to achieve a balance between microwave shielding effect and transmittance.

[0024] Preferably, the wire width of the metal wire 231 is 1-30 μm, more preferably 5-15 μm.

[0025] Preferably, the metal mesh layer 23 is formed by yellow light subtractive etching. In this embodiment, in order to control the line width of the metal wire 231, a high-precision yellow light subtractive etching technology is used to complete the processing of the metal mesh layer 23, and the processing accuracy of the line is completed below 30μm by high-precision etching subtractive technology. The metal mesh layer 23 is formed by using metal materials on the surface of a hard or flexible transparent substrate (such as glass or film) and other materials. The metal lines are staggered through a mask to achieve microwave shielding characteristics.

[0026] Preferably, the metal mesh layer 23 is made of copper metal.

[0027] Preferably, the transmittance of the observation window 2 is greater than 85%, more preferably 90%.

[0028] Preferably, a sensor and an alarm device are also included; the two sides of the metal grid layer 23 are conductive areas, and the conductive areas are connected to the sensor through FPC cables; the sensor detects the resistance change of the metal grid layer 23 and is connected to the alarm device.

[0029] Through the above structural design, the sensor is used to monitor the resistance value of the metal mesh layer 23. When the metal mesh layer 23 is damaged, the sensor detects that the resistance value currently recorded is different from the measurement value of the previous record of the sensor, and when the current state changes, a signal is sent to the alarm device, and the alarm device immediately sends a reminder to the outside through sound and light signals, and shuts down the microwave oven in time.

[0030] Preferably, a door closing detection switch is provided on the door frame 1, and the door closing detection switch is connected to the alarm. By providing the door closing detection switch to detect whether the door frame 1 is closed, when the door frame 1 is closed, the sensor will send out an alarm that the metal mesh layer 23 is damaged through the alarm device, thereby reducing the possibility of misjudgment by the user.

[0031] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model adopts a yellow light subtractive etching process to prepare a metal grid layer, the line width of which is between 1-30μm, and the shape of the grid can be a rhombus, a square or a hexagon. The metal grid layer is bonded to the cover plate through an optical adhesive layer to form an observation window integrated into the door frame of the microwave oven. Microwaves can be shielded by the metal grid layer and will not cause microwave leakage, so that the microwave oven can achieve high visibility of the observation window while having an effective microwave shielding function, making it convenient for users to observe the heating of food.

[0032] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A transparent electromagnetic shielding window for a microwave oven based on a metal grid conductive film, characterized in that: It comprises a door frame (1) and an observation window (2), wherein the observation window comprises a cover plate (21), an optical adhesive layer (22) and a metal mesh layer (23), wherein the metal mesh layer is bonded to the cover plate via the optical adhesive layer; the metal mesh layer comprises a plurality of metal wires (231), and the plurality of metal wires are distributed in a grid shape.

2. The transparent electromagnetic shielding window for microwave ovens based on metal mesh conductive film according to claim 1, characterized in that: The shape of the grid formed by the plurality of metal wires is rhombus, square or hexagon.

3. The transparent electromagnetic shielding window for microwave ovens based on metal mesh conductive film according to claim 2, characterized in that: The wire width of the metal wire is 1-30 μm.

4. The transparent electromagnetic shielding window for microwave oven based on metal mesh conductive film according to claim 1, characterized in that: The metal grid layer is formed by yellow light subtractive etching.

5. The transparent electromagnetic shielding window for microwave ovens based on metal mesh conductive film according to claim 4, characterized in that: The material of the metal grid layer is copper metal.

6. The transparent electromagnetic shielding window for microwave oven based on metal mesh conductive film according to claim 1, characterized in that: The transmittance of the observation window is greater than 85%.

7. The transparent electromagnetic shielding window for microwave ovens based on a metal mesh conductive film according to any one of claims 1 to 6, characterized in that: It also includes a sensor and an alarm device; the two sides of the metal grid layer are conductive areas, and the conductive areas are connected to the sensor through FPC cables; the sensor detects the resistance change of the metal grid layer and is connected to the alarm device.

8. The transparent electromagnetic shielding window for microwave ovens based on metal mesh conductive film according to claim 7, characterized in that: It also includes a door closing detection switch arranged on the door frame, and the door closing detection switch is connected to the alarm device.

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