A flexible circuit board ground connection mechanism for a sensor

Abstract

The utility model relates to pressure sensor technical field, concretely is a kind of flexible circuit board ground connection mechanism for sensor, including the pressure port seat with installation cavity, the connector of being inserted with installation cavity adaptation, and the flexible circuit board being located in installation cavity.Insertion slot is provided for the connector pin insertion of flexible circuit board, and the outside side of insertion slot is ground contact pad;The inner wall of installation cavity is equipped with support convex ring, and when connector pin is inserted into insertion slot, ground contact pad is extruded, so that it is adhered to support convex ring and realizes grounding.This mechanism realizes stable grounding by insertion extrusion, improves the grounding reliability and anti-interference ability, simplifies assembly process, enhances environmental adaptability, and is applicable to the pressure sensor of high precision, high reliability required in industry, medical treatment, aerospace and other fields.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor technology, and in particular to a flexible circuit board grounding connection mechanism for sensors. Background Technology

[0002] A pressure sensor is a device that senses pressure signals and converts them into usable output electrical signals according to a certain rule. It is widely used in industrial control, medical equipment, aerospace, and other fields. In pressure sensors, the core purpose of grounding the circuit board is to establish a stable potential reference point, suppress electromagnetic interference, reduce signal noise, and ensure that the weak signals output by sensitive elements such as strain gauges and piezoelectric components can be accurately acquired and processed. However, the existing technology of grounding by connecting the circuit board to the casing through conductive posts has many drawbacks: its reliance on mechanical contact connection is prone to unstable contact impedance due to insufficient assembly pressure, surface oxidation, or vibration loosening, reducing grounding reliability; when multiple conductive posts are connected, ground loops are easily formed, inducing low-frequency noise in alternating magnetic fields, which seriously affects the accuracy of low-range measurements; in vibration environments, mechanical connections are prone to contact noise, and long-term use will exacerbate wear and oxidation, and even cause short-circuit risks; conductive posts can easily become coupling channels for electromagnetic interference, and high-frequency electromagnetic waves can be coupled to the circuit board through them, interfering with signal conditioning circuits; conductive posts made of dissimilar metals are prone to electrochemical corrosion with the casing and pads in harsh environments, destroying the grounding path; at the same time, differences in assembly processes lead to poor product consistency, making it difficult to meet the requirements of high-precision and high-reliability applications.

[0003] Therefore, optimizing and upgrading the pressure transmission and sealing structure of pressure sensors has become a key breakthrough direction for improving their performance and adapting to complex working conditions. Utility Model Content

[0004] The purpose of this invention is to overcome the problems of the prior art and provide a flexible circuit board grounding connection mechanism for sensors, which solves the technical problems of unreliable grounding contact, poor anti-interference and low assembly consistency of traditional conductive post grounding.

[0005] The above objectives are achieved through the following technical solutions: A flexible circuit board grounding connection mechanism for a sensor, comprising: The pressure port seat has a mounting cavity; the inner wall of the mounting cavity is provided with a supporting protrusion ring; A connector that can be fitted and plugged into the mounting cavity; A flexible circuit board is disposed within the mounting cavity. The flexible circuit board integrates a signal processing chip and a signal processing circuit for connecting the lower pressure sensing module and the terminals of the upper connector to transmit the pressure signal detected by the pressure sensing module. The flexible circuit board has a flexible circuit board slot for the connector pins of the connector to be inserted, and the outer side of the flexible circuit board slot forms a grounding contact pad. When the connector pins are inserted into the flexible circuit board slot, they exert outward pressure on the grounding pad, causing the grounding pad to fit against the supporting protrusion ring, thereby achieving the grounding connection of the flexible circuit board.

[0006] Furthermore, there are two flexible circuit board slots, symmetrically arranged on both sides of the flexible circuit board; correspondingly, there are two grounding pads; and there are two connector pins, which are respectively adapted to and plugged into the two flexible circuit board slots.

[0007] Furthermore, the outer wall of the connector pin is provided with a pin protrusion, which applies an outward pressing force to the grounding pad when the connector pin is inserted into the flexible circuit board slot.

[0008] Furthermore, the pin bump is an elastic protrusion (such as silicone or elastic plastic) that maintains continuous pressure on the grounding pad after the connector pin is inserted.

[0009] Furthermore, the pin protrusion is integrally formed with the connector.

[0010] Furthermore, the flexible circuit board uses a polyimide substrate, and the grounding pad is a copper foil layer on the flexible circuit board with a nickel or gold plating on the surface.

[0011] Furthermore, the pressure port seat is made of metal (such as aluminum alloy or stainless steel), and the support protrusion is integrally formed with the pressure port seat.

[0012] Furthermore, the supporting protrusion is an annular protrusion that extends circumferentially along the inner wall of the mounting cavity, and its surface is provided with a conductive plating layer (such as a silver or gold plating layer); the grounding pad and the supporting protrusion are treated with an anti-oxidation plating layer, which avoids direct contact between dissimilar metals, significantly enhances the corrosion resistance in humid and corrosive environments, and extends the service life of the equipment.

[0013] Furthermore, the connector and the mounting cavity are connected and fixed by a snap-fit ​​structure, a pin structure, or a threaded structure.

[0014] This utility model provides a flexible circuit board grounding connection mechanism for sensors. Through an innovative grounding connection mechanism between the flexible circuit board and the housing, it effectively overcomes the shortcomings of traditional conductive post grounding methods, offering significant advantages: First, the connector pins compress the flexible circuit board grounding pads and supporting protrusions to form a stable, low-impedance grounding path, avoiding impedance fluctuations caused by traditional mechanical contact and significantly improving grounding reliability. Second, the symmetrically arranged grounding pads and elastic pin protrusions ensure uniform and continuous contact pressure, effectively suppressing contact noise in vibration environments and eliminating low-frequency interference caused by ground loops, significantly improving low-range measurement accuracy. Third, the plug-in assembly design simplifies the process, reduces the impact of manual operation differences, improves product consistency and production efficiency, and can meet the stringent requirements of high precision and high reliability for pressure sensors in industries such as industry, medicine, and aerospace. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the assembled flexible circuit board grounding connection mechanism for a sensor according to the present invention; Figure 2 This is a schematic diagram of the flexible circuit board grounding connection mechanism for a sensor described in this utility model before assembly.

[0016] Illustration markings: 1-Pressure port seat, 101-Mounting cavity, 102-Supporting protrusion ring; 2-Flexible circuit board, 201-Flexible circuit board slot, 202-Grounding contact pad; 3-Connector, 301-Connector pin, 302-Pin bump; 4-Pressure sensing module. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] like Figure 1 and 2 As shown, this solution provides a flexible circuit board grounding connection mechanism for sensors. By replacing the traditional conductive post with "plug-in compression grounding", the following objectives are achieved: (1) improving the stability and reliability of the grounding connection and resisting vibration and oxidation interference; (2) avoiding the formation of ground loops and enhancing electromagnetic compatibility; (3) simplifying the assembly process and improving production consistency.

[0019] This flexible circuit board grounding connection mechanism includes the following core components and their connections: Pressure port seat 1: As the core load-bearing structure of the sensor housing, it has an internal mounting cavity 101 for accommodating the flexible circuit board 2 and the pressure sensing module 4; the inner wall of the mounting cavity 101 has an annular protrusion supporting the convex ring 102, which provides a physical support surface for grounding connection.

[0020] Connector 3: It is adapted to the mounting cavity 101 for insertion to realize signal transmission between the sensor and external devices; the bottom is provided with connector pin 301 for insertion into the flexible circuit board slot 201.

[0021] Flexible circuit board 2: integrates signal processing chip and signal processing circuit, and synchronously realizes signal transmission connection pressure sensing module and connector terminal and grounding connection; the edge is provided with flexible circuit board slot 201 for connector pin 301 to be inserted; the outer side of the slot is designed as a grounding contact pad 202 conductive area, such as a copper foil layer, as the core contact point for grounding connection.

[0022] like Figure 2 As shown, the grounding connection principle of this flexible circuit board grounding connection mechanism is as follows: When connector 3 is inserted into mounting cavity 101, connector pin 301 enters flexible circuit board slot 201, forming an outward squeezing force on grounding contact pad 202, forcing grounding contact pad 202 to fit tightly against support protrusion ring 102, thereby constructing a low-impedance grounding path of "flexible circuit board → support protrusion ring → pressure port seat housing".

[0023] The grounding pad 202 of the flexible circuit board connects the circuit ground with the outer ground of the pressure port seat through close contact with the supporting protrusion ring 102, thereby achieving stable grounding and suppressing electromagnetic interference.

[0024] like Figure 1 and 2 As shown, the following optimizations are made to this solution: A symmetrical layout is adopted: two flexible circuit board slots 201, two grounding pads 202, and two connector pins 301 are provided, symmetrically distributed on both sides of the flexible circuit board to ensure uniform compression force and consistent contact resistance, and avoid poor contact caused by force on one side.

[0025] The connector adopts an elastic compression structure: the outer wall of the connector pin 301 is provided with a pin protrusion 302 made of elastic material, such as silicone. After insertion, it continuously compresses the grounding pad 202 to compensate for the deformation caused by vibration and temperature changes, and ensures contact stability.

[0026] The conductive enhancement design is adopted: 1. The surface of the support protrusion ring 102 is plated with silver / gold to reduce contact resistance; 2. The grounding contact pad 202 adopts the copper foil layer of the flexible circuit board and is plated with nickel / gold to prevent oxidation and improve long-term reliability.

[0027] The pressure port seat 1 is made of metal such as aluminum alloy, and the supporting convex ring 102 is integrally formed with the seat body to ensure grounding continuity and avoid impedance abrupt changes in the splicing structure.

[0028] The above description is only for illustrating the embodiments of this utility model and is not intended to limit this utility model. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flexible circuit board grounding connection mechanism for a sensor, characterized in that, include: The pressure port seat (1) has a mounting cavity (101); the inner wall of the mounting cavity (101) is provided with a support protrusion (102). The connector (3) is adapted to be inserted into the mounting cavity (101); A flexible circuit board (2) is disposed in the mounting cavity (101). The flexible circuit board (2) is provided with a flexible circuit board slot (201) for the connector pin (301) of the connector (3) to be inserted, and a grounding pad (202) is formed on the outer side of the flexible circuit board slot (201). When the connector pin (301) is inserted into the flexible circuit board slot (201), it exerts an outward pressure on the grounding pad (202), causing the grounding pad (202) to fit against the support protrusion (102), thereby achieving the grounding connection of the flexible circuit board (2).

2. The flexible circuit board grounding connection mechanism for a sensor according to claim 1, characterized in that, There are two flexible circuit board slots (201), which are symmetrically arranged on both sides of the flexible circuit board (2); correspondingly, there are two grounding pads (202); The connector pins (301) are two in number, and are respectively adapted to be inserted into the two flexible circuit board slots (201).

3. A flexible circuit board grounding connection mechanism for a sensor according to claim 1 or 2, characterized in that, The outer wall of the connector pin (301) is provided with a pin protrusion (302), which applies an outward pressing force to the grounding pad (202) when the connector pin (301) is inserted into the flexible circuit board slot (201).

4. The flexible circuit board grounding connection mechanism for a sensor according to claim 3, characterized in that, The pin protrusion (302) is an elastic protrusion that maintains a continuous pressing force on the grounding pad (202) after the connector pin (301) is inserted.

5. A flexible circuit board grounding connection mechanism for a sensor according to claim 3, characterized in that, The pin protrusion (302) is integrally formed with the connector (3).

6. The flexible circuit board grounding connection mechanism for a sensor according to claim 1, characterized in that, The flexible circuit board (2) is made of polyimide substrate, and the grounding pad (202) is a copper foil layer on the flexible circuit board (2) with nickel or gold plating on the surface.

7. A flexible circuit board grounding connection mechanism for a sensor according to claim 1 or 6, characterized in that, The pressure port seat (1) is made of metal, and the support protrusion ring (102) is integrally formed with the pressure port seat (1).

8. A flexible circuit board grounding connection mechanism for a sensor according to claim 1, characterized in that, The supporting protrusion (102) is an annular protrusion that extends circumferentially along the inner wall of the mounting cavity (101), and its surface is provided with a conductive plating layer.

9. A flexible circuit board grounding connection mechanism for a sensor according to claim 1, characterized in that, The connector (3) and the mounting cavity (101) are connected and fixed by a snap-fit ​​structure, a pin structure or a threaded structure.

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