CN-224230989-U - Foil type resistance sensitive element

Abstract

The utility model discloses a foil type resistance sensitive element which comprises a substrate, wherein a protective film is stuck on the top of the substrate, a plurality of foil wire grids are stuck between the substrate and the protective film, two welding pieces are fixedly connected to the inner wall of the foil wire grids, and a plurality of through holes are formed in the protective film. According to the foil-type resistance sensitive element provided by the utility model, through the through holes are formed in the protective film, when the external lead wires are welded with the welding pieces by means of soldering, the lead wires penetrate through the through holes to be in contact with the corresponding welding pieces, so that soldering can be performed, the through holes can limit the flowing range of liquid tin, the risk that adjacent soldering flows to be in contact is reduced, the short circuit or poor welding quality is reduced, and the practicability of the device is improved.

Inventors

• CAI DIANXIANG

Assignees

• 益阳市赫山区广测电子有限公司

Dates

Publication Date

20260512

Application Date

20250506

Claims (5)

1. 1. A foil type resistance sensitive element comprises a substrate (1) and is characterized in that a protective film (2) is adhered to the top of the substrate (1), a plurality of foil wire grids (4) are adhered between the substrate (1) and the protective film (2), two welding pieces (5) are fixedly connected to the inner wall of each foil wire grid (4), and a plurality of through holes (3) are formed in the protective film (2).
2. 2. Foil resistive sensor according to claim 1, characterized in that the number of foil wire gratings (4) is at least one and the number of through holes (3) is at least two.
3. 3. Foil-type resistive sensor according to claim 1, characterized in that the material of the protective film (2) is a transparent material, either epoxy, polyimide or fiberglass cloth.
4. 4. Foil-type resistive sensor according to claim 1, characterized in that the through hole (3) is circular or elliptical in shape.
5. 5. Foil-type resistive sensor according to claim 1, characterized in that the material of the substrate (1) is any one of phenolic resin, epoxy resin, polyimide or glass cloth.

Description

Foil type resistance sensitive element Technical Field The utility model relates to the technical field of sensors, in particular to a foil-type resistance sensitive element. Background Foil-type resistive sensing elements are sensor elements based on metallic foil materials, which are commonly used to measure changes in physical quantities such as strain, pressure, force or torque. When an external force acts on the foil-type resistance sensitive element, the surface of the foil-type resistance sensitive element can be slightly deformed, so that the resistance is changed. By accurately measuring the change in resistance, physical information related to external force can be obtained. For example, chinese patent (CN 108328561A) discloses a metal glass micro-foil resistance type strain sensor and a preparation method thereof, wherein the invention discloses that ' the metal glass foil is used as a sensitive material to improve the measuring range and the performance of a commercial traditional foil type strain sensor and realize an ideal resistance type strain sensor ', the preparation process is compatible with the existing foil type strain gauge production process and brings convenience to commercial popularization thereof ', and ' when the measured strain exceeds the strain range, the sensitive grid in the strain gauge is subjected to plastic deformation and even fracture '. Although some strain gages have a strain measurement limit of up to 20%, the strain gages cannot be reused due to plastic deformation. Thus, the strain gauge typically operates only within the elastic strain limit of the sensitive grating. "technical problem. In summary, it is known that in the prior art, a layer of adhesive is coated on the surface of the metallic glass sensitive grid to fill the gaps between the grid wires and form a layer of adhesive film on the surface of the foil grid (exposing the welding end of the sensitive grid), but in the practical situation, there are foil-type resistance sensitive elements with different sizes, when the width of the substrate is smaller and the whole approaches to a strip shape, the distance between the two welding end parts of the metallic glass sensitive grid is reduced, which may cause the accidental contact of the two solder balls when an operator connects the welding end parts with the lead wires through soldering, thereby causing a short circuit problem. Disclosure of utility model Based on the above, it is necessary to provide a foil-type resistance sensor, by providing a through hole in the protective film, when soldering is performed on an external lead wire and a soldering tab by means of soldering, the lead wire is passed through the through hole to be in contact with the corresponding soldering tab, so that soldering can be performed therewith, the flow range of liquid tin can be limited by the through hole, the risk that adjacent soldering flows to be in contact is reduced, the short circuit or poor soldering quality is reduced, and the practicability of the device is improved. In order to solve the technical problems, the utility model adopts the following technical scheme: a foil-type resistance sensitive element is applied to a sensor. The foil-type resistance sensitive element specifically comprises: The plastic packaging structure comprises a substrate, wherein a protective film is adhered to the top of the substrate, a plurality of foil wire grids are adhered between the substrate and the protective film, two welding pieces are fixedly connected to the inner wall of the foil wire grids, and a plurality of through holes are formed in the protective film. As a preferred embodiment of the foil type resistance sensing element provided by the utility model, the number of the foil wire grids is at least one, and the number of the through holes is at least two. As a preferred embodiment of the foil-type resistance sensitive element provided by the utility model, the material of the protective film is a transparent material, and specifically any one or more of epoxy resin, polyimide or glass fiber cloth are mixed. As a preferred embodiment of the foil-type resistance sensing element provided by the utility model, the shape of the through hole is circular or elliptical. As a preferred embodiment of the foil-type resistance sensing element provided by the utility model, the substrate is made of any one of phenolic resin, epoxy resin, polyimide or glass fiber cloth. Compared with the prior art, the utility model has the following beneficial effects: According to the foil type resistance sensitive element provided by the utility model, through the through holes are formed in the protective film, when the external lead wires are welded with the welding pieces by means of soldering, the lead wires penetrate through the connecting parts of the through holes and the corresponding welding pieces, so that soldering can be performed, the through holes can limit the flowing range of liquid