Membrane switch for microwave oven

Abstract

The utility model discloses a membrane switch for a microwave oven, which relates to the field of membrane switches and specifically comprises a membrane switch body, a conductive band is fixedly connected to one side of the membrane switch body, a connecting sheet is arranged at the end part of the conductive band, and the membrane switch body comprises a circuit layer. An upper insulating layer and a lower insulating layer are fixedly connected to the upper side and the lower side of the circuit layer respectively, a plurality of electrode plates are arranged above the circuit layer, a plurality of through holes are correspondingly formed in the upper insulating layer, a plurality of protrusions are arranged on the top of the outer layer film, the protrusions correspond to the through holes one to one, and metal conducting strips are arranged on the inner sides of the protrusions. The metal conducting strip in the membrane switch for the microwave oven can effectively rebound and be separated from the electrode plate.

Description

Technical Field

[0001] The utility model relates to the technical field of membrane switches, in particular to a membrane switch for microwave ovens. Background Art

[0002] Membrane switch is a special switch with indicator light and buttons, which can be embedded in the panel. The panel of the membrane switch is covered with transparent film, plastic sheet or button to form a membrane structure, and the film or button has conductive or non-conductive contacts. The on and off of these contacts directly determines the connection or disconnection of the circuit, thus realizing the function of the switch. Membrane switch has the characteristics of small size, thin thickness, light weight, beautiful appearance, comfortable feel, long life, wear resistance, and water washability. Membrane switches are widely used in various instruments and equipment, household appliances, industrial control, office equipment, communication equipment, and automotive industry.

[0003] Membrane switches used in microwave ovens require good waterproof performance, and due to the frequent use of microwave ovens, the membrane switch needs to have a long service life. Existing membrane switches often have the problem that the keys cannot rebound, which causes the switch to fail and affects normal use. Therefore, a membrane switch that can be used in microwave ovens is designed. Utility Model Content

[0004] The utility model aims to provide a membrane switch for a microwave oven to solve the problems of uneven water distribution, inability to strictly control water, and water evaporation mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a membrane switch for a microwave oven, comprising a membrane switch body, a conductive strip fixedly connected to one side of the membrane switch body, a connecting sheet arranged at the end of the conductive strip, the membrane switch body comprising a circuit layer, an upper insulating layer and a lower insulating layer fixedly connected to the upper and lower sides of the circuit layer, respectively, a plurality of electrode sheets are arranged above the circuit layer, a plurality of through holes are correspondingly opened on the upper insulating layer, a pair of protrusions are arranged on the top of the outer film, the protrusions correspond to the through holes one by one, and a metal conductive sheet is arranged on the inner side of the protrusions.

[0006] Preferably, the electrode sheet is cylindrically arranged, inserted into the through hole, and the outer diameter of the electrode sheet is the same as the inner diameter of the through hole, the thickness of the electrode sheet is smaller than the thickness of the upper insulating layer, and the maximum outline diameter of the protrusion is larger than the inner diameter of the through hole.

[0007] Preferably, the circuit layer is wrapped with a waterproof cover, one side of the waterproof cover is provided with an open groove, the conductive tape passes through the open groove, and the conductive tape is electrically connected to the circuit layer.

[0008] Preferably, the protrusion is arranged in a partially spherical shape, and the metal conductive sheet is formed by applying conductive paint on the protrusion and solidifying it.

[0009] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0010] The utility model discloses a membrane switch for a microwave oven. An upper insulating layer is arranged on a circuit layer, and a through hole is opened on the upper insulating layer. Since the maximum outline diameter of the protrusion is larger than the inner diameter of the through hole, when the protrusion is pressed downward, it will be blocked by the through hole. Even if the protrusion cannot be completely reset, it will be separated from the electrode sheet, and the transmission of the electrical signal will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 It is a partial cross-sectional view of the utility model;

[0013] Figure 3 It is a schematic diagram of the waterproof cover structure in the utility model.

[0014] In the figure: 1. membrane switch body; 11. circuit layer; 111. electrode sheet; 12. upper insulating layer; 121. through hole; 13. outer film; 131. protrusion; 132. metal conductive sheet; 14. lower insulating layer; 15. waterproof cover; 151. opening groove; 2. conductive tape; 3. connecting sheet. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the implementation regulations described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] See also Figure 1-3 A membrane switch for a microwave oven comprises a membrane switch body 1, a conductive tape 2 is fixedly connected to one side of the membrane switch body 1, a connecting piece 3 is arranged at the end of the conductive tape 2, and the conductive tape 2 and the connecting piece 3 are used to connect to other external circuits.

[0017] The membrane switch body 1 includes a circuit layer 11, and the upper and lower sides of the circuit layer 11 are fixedly connected to the upper and lower insulating layers 12 and the lower insulating layer 14, respectively. A plurality of electrode sheets 111 are arranged above the circuit layer 11, and a plurality of through holes 121 are correspondingly opened on the upper insulating layer 12. A pair of protrusions 131 are arranged on the top of the outer film 13, and the protrusions 131 correspond to the through holes 121 one by one. A metal conductive sheet 132 is arranged inside the protrusion 131. When the protrusion 131 is pressed downward, the metal conductive sheet 132 contacts the electrode sheet 111, and the circuit layer 11 receives an electrical signal.

[0018] Furthermore, the electrode sheet 111 is arranged in a cylindrical shape, the electrode sheet 111 is inserted into the through hole 121, and the outer diameter of the electrode sheet 111 is the same as the inner diameter of the through hole 121, the thickness of the electrode sheet 111 is less than the thickness of the upper insulating layer 12, and the maximum outline diameter of the protrusion 131 is greater than the inner diameter of the through hole 121. When the protrusion 131 is pressed down, the metal conductive sheet 132 passes through the through hole 121 and the electrode sheet 111 is released. When the protrusion 131 is released, even if the protrusion 131 cannot be completely reset, it will be separated from the electrode sheet 111 under the action of the through hole 121.

[0019] The circuit layer 11 is wrapped with a waterproof cover 15, and an opening groove 151 is opened on one side of the waterproof cover 15. The conductive tape 2 passes through the opening groove 151, and the conductive tape 2 and the circuit layer 11 are electrically connected. The waterproof cover 15 can prevent external moisture from entering through the gap between the circuit layer 11 and the insulating layer, causing circuit damage and signal failure.

[0020] The protrusion 131 is partially spherical, and the metal conductive sheet 132 is formed by applying conductive paint on the protrusion 131 and solidifying. This design allows the metal conductive sheet 132 and the protrusion 131 to have good resilience.

[0021] Working principle: The utility model is a membrane switch for a microwave oven. When in use, when the protrusion 131 is pressed downward, the metal conductive sheet 132 contacts the electrode sheet 111, and the circuit layer 11 receives the electrical signal, which is transmitted to the internal circuit of the microwave oven through the conductive tape 2 and the connecting sheet 3. Since the traditional membrane switch is often pressed, the button is prone to incomplete rebound, resulting in failure of the control function. In the utility model, an upper insulating layer 12 is provided on the circuit layer 11, and a through hole 121 is opened on the upper insulating layer 12. Since the maximum outline diameter of the protrusion 131 is larger than the inner diameter of the through hole 121, when the protrusion 131 is pressed downward, it will be hindered by the through hole 121. Even if the protrusion 131 cannot be completely reset, it will be separated from the electrode sheet 111, and will not affect the transmission of the electrical signal.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A membrane switch for a microwave oven, comprising a membrane switch body (1), a conductive strip (2) fixedly connected to one side of the membrane switch body (1), a connecting piece (3) being provided at the end of the conductive strip (2), characterized in that: The membrane switch body (1) comprises a circuit layer (11), the upper and lower sides of the circuit layer (11) are respectively fixedly connected to an upper insulating layer (12) and a lower insulating layer (14), a plurality of electrode sheets (111) are arranged above the circuit layer (11), a plurality of through holes (121) are correspondingly opened on the upper insulating layer (12), a pair of protrusions (131) are arranged on the top of the outer film (13), the protrusions (131) and the through holes (121) correspond one to one, and a metal conductive sheet (132) is arranged inside the protrusion (131).

2. A membrane switch for a microwave oven according to claim 1, characterized in that: The electrode sheet (111) is arranged in a cylindrical shape, the electrode sheet (111) is inserted into the through hole (121), and the outer diameter of the electrode sheet (111) is the same as the inner diameter of the through hole (121), the thickness of the electrode sheet (111) is less than the thickness of the upper insulating layer (12), and the maximum outline diameter of the protrusion (131) is greater than the inner diameter of the through hole (121).

3. The membrane switch for a microwave oven according to claim 1, characterized in that: The circuit layer (11) is surrounded by a waterproof cover (15), one side of the waterproof cover (15) is provided with an open groove (151), the conductive tape (2) passes through the open groove (151), and the conductive tape (2) and the circuit layer (11) are electrically connected.

4. The membrane switch for a microwave oven according to claim 1, characterized in that: The protrusion (131) is arranged in a partially spherical shape, and the metal conductive sheet (132) is formed by applying conductive paint on the protrusion (131) and solidifying it.

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