Impact-resistant MEMS switch circuit test tool

Abstract

The invention provides an impact-resistant MEMS switching circuit test tool, which comprises a bottom plate (1), and is characterized in that a switching circuit placing groove (2) is formed in the bottom plate (1), a pair of spring needles (3) correspondingly matched with a switching circuit is arranged in the switching circuit placing groove (2) in a penetrating manner, a pair of wiring terminals (4) correspondingly matched with the spring needles (3) are mounted on the bottom plate (1), and the spring needles (3) are arranged on the wiring terminals (4). And a correspondingly matched knocking assembly (5) is arranged on the bottom plate (1) on one side of the switch circuit placing groove (2). The device has the advantages of being simple in structure, convenient to use, stable, reliable, good in circuit fixity, efficient in testing, free of any damage to the upper surface of the circuit and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor integrated circuit MEMS impact switch testing, in particular to an impact-resistant MEMS switch circuit testing tool. Background Art

[0002] A MEMS impact switch is an actuator with acceleration sensing capabilities. It flips the switch state through impact, thereby sensing a certain amount of acceleration and achieving state transitions. The MEMS switch has two contacts: one on a movable mass connected to the frame via a precisely designed spring; the other on a fixed post insulated from the frame.

[0003] The working principle of a MEMS switch is as follows: when impact acceleration acts on the MEMS switch, it causes the movable mass to move. When the impact acceleration exceeds the set threshold, the two contacts touch and the switch is turned on; when the acceleration amplitude falls below the threshold, the switch is disconnected. It can be used as a non-locking single-pole single-position switch with the characteristics of accurate threshold, rapid response, long contact retention time, low contact resistance, and high overload resistance. It is currently widely used in fuses, insurance structures, impact monitoring and other fields.

[0004] Currently, MEMS switch circuits are tested using a small pneumatic shock table (which provides acceleration shock) as the main body and a self-built signal acquisition peripheral. Since the MEMS shock switch is packaged in the DFN package of SMD, a new type of package with a typical size of 3mm×2mm×1.7mm, the size is very small. During testing, the MEMS switch circuit also needs to withstand high-g acceleration physical shock. In early tests, the circuit was fixed with tape. The test and replacement time of each switch was long, and there may be unreliable fixation, which affects the accuracy and consistency of the test results. Therefore, it does not affect the test results. These problems greatly affect the reliability testing and engineering applications of MEMS switches. Summary of the Invention

[0005] The present invention is to overcome the shortcomings of the prior art and provide a shock-resistant MEMS switch circuit test fixture. This application provides the following technical solutions: A shock-resistant MEMS switch circuit test fixture includes a base plate connected and fixed to a work surface, and is characterized in that: a switch circuit placement groove is provided on the base plate, a pair of spring pins corresponding to the switch circuit are inserted into the switch circuit placement groove, a pair of wiring terminals are installed on the base plate to form an electrical signal connection with the spring pins, and a correspondingly distributed knocking component is provided on the base plate on one side of the switch circuit placement groove.

[0006] On the basis of the above technical solutions, the following further technical solutions can be provided: The knocking assembly includes a mounting bracket connected to the base plate, a knocking arm is hinged on one side of the mounting bracket, a knocking block is movably connected to one end of the knocking arm, a control handle is hinged on the other end of the knocking arm, a movable arm is hinged on the control handle, and one end of the movable arm is hinged to the other side of the mounting bracket.

[0007] A lead screw is provided on the wiring terminal.

[0008] A notch is provided on one side of the switch circuit placement slot.

[0009] Advantages of the invention: The present invention has the advantages of simple structure, convenient use, stability and reliability, good circuit fixation, high testing efficiency, and no damage to the upper surface of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a bottom view of the present invention. DETAILED DESCRIPTION

[0011] like Figure 1 and 2 As shown, a shock-resistant MEMS switch circuit test fixture includes a rectangular base plate 1 fixedly connected to a work surface. A switch circuit placement slot 2 is provided on the upper surface of one end of the base plate 1, with a notch 2a provided on one side of the switch circuit placement slot 2. Arc-shaped slots 2b communicating with the switch circuit placement slot 2 are provided at the four corners and one sidewall of the switch circuit placement slot 2.

[0012] A pair of spring-loaded pins 3 corresponding to the switch circuits are inserted into the switch circuit placement slot 2. A pair of wiring terminals 4 are mounted on the lower surface of the base plate 1. One end of the wiring terminals 4 connects to the lower end of the spring-loaded pins 3 to form an electrical signal connection. The other end of the wiring terminals 4 is mounted with lead screws 4a.

[0013] A correspondingly distributed knocking assembly 5 is installed on the upper surface of the base plate 1 on one side of the switch circuit placement slot 2. The knocking assembly 5 includes a saddle-shaped mounting bracket 5a, which is fixedly connected to the base plate 1 by a set of screws.

[0014] A striking arm 5b is hingedly connected to a protrusion on one side of the mounting bracket 5a. A torsion spring (not shown) is mounted at the hinge, corresponding to the striking arm 5b. A screw 5f is threaded through one end of the striking arm 5b, and nuts 5g are mounted on the upper and lower sides of the screw 5f. A rubber striking block 5c is threadedly connected to the lower end of the screw 5f.

[0015] A control handle 5d is hinged to the other end of the striking arm, a movable arm 5e is hinged to the control handle 5d, and one end of the movable arm 5e is hinged to the other side of the mounting bracket 5a.

[0016] Working process: Place the MEMS switch into the switch circuit placement slot and make the two contacts of the MEMS switch contact the upper end of the spring pin respectively. Then press the control handle to lift the tapping arm. At the same time, the torsion spring stores energy. Release the control handle to release the torsion spring. The tapping block at one end of the tapping arm taps the MEMS switch downward, causing the two contacts of the MEMS switch to press the spring pin down, thereby turning on the MEMS switch. The electrical signal is transmitted from the lead screw to realize the connection and transmission of the test signal.

Claims

1. A shock-resistant MEMS switch circuit test fixture, comprising a base plate (1) connected and fixed to a working surface, characterized in that: A switch circuit placement groove (2) is provided on the bottom plate (1), a pair of spring pins (3) corresponding to the switch circuit are inserted into the switch circuit placement groove (2), a pair of connection terminals (4) for forming an electrical signal connection with the spring pins (3) are installed on the bottom plate (1), and a correspondingly distributed knocking component (5) is provided on the bottom plate (1) on one side of the switch circuit placement groove (2).

2. The shock-resistant MEMS switch circuit testing tool according to claim 1, characterized in that: The knocking assembly (5) comprises a mounting bracket (5a) connected to the base plate (1), a knocking arm (5b) is hingedly connected to one side of the mounting bracket (5a), a knocking block (5c) is movably connected to one end of the knocking arm, a control handle (5d) is hingedly connected to the other end of the knocking arm, a movable arm (5e) is hingedly connected to the control handle (5d), and one end of the movable arm (5e) is hingedly connected to the other side of the mounting bracket (5a).

3. The shock-resistant MEMS switch circuit testing tool according to claim 1, characterized in that: A lead screw (4a) is provided on the wiring terminal (4).

4. The shock-resistant MEMS switch circuit testing tool according to claim 1, characterized in that: A notch (2a) is provided on one side of the switch circuit placement slot (2).

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