US-20260128743-A1 - MAGNETIC INDUCTION MICRO SWITCH WITH SELF-CALIBRATION

Abstract

The present application discloses a magnetic induction micro switch with self-calibration. The micro switch includes a base provided on a printed circuit board (PCB), a housing cooperating with the base to form an installation cavity, a spring sheet installed in the installation cavity of the base via a conductive support, a limiting frame connected to a movable end of the spring sheet, and an operating member cooperating with the spring sheet and partially extending out of the housing. The spring sheet is connected to the PCB through the support and a first terminal extending downward from the base, a magnetic block is installed on the movable end of the spring sheet, and the magnetic block faces a Hall sensor located on the PCB. A movable contact is provided near a front end of the spring sheet, and a stationary contact opposite to the movable contact is provided on the base.

Inventors

• Bo Teng
• Yuexin Gu
• Teng TENG
• Lingfeng Teng

Assignees

• YUEQING TENGFEI ELECTRONICS CO., LTD.

Dates

Publication Date

20260507

Application Date

20251106

Priority Date

20241107

Claims (4)

1. 1 . A magnetic induction micro switch with self-calibration, comprising: a base provided on a printed circuit board (PCB), a housing cooperating with the base to form an installation cavity, a spring sheet installed in the installation cavity of the base via a conductive support, a limiting frame connected to a movable end of the spring sheet, and an operating member cooperating with the spring sheet and partially extending out of the housing, wherein the spring sheet is connected to the PCB through the support and a first terminal extending downward from the base, a magnetic block is installed on the movable end of the spring sheet, and the magnetic block faces a Hall sensor located on the PCB; and a movable contact is provided near a front end of the spring sheet, a stationary contact opposite to the movable contact is provided on the base, the stationary contact is connected to the PCB via a second terminal, in a case where the operating member moves, the operating member pushes the movable end of the spring sheet and a connected section toward the base, causing the movable contact to engage the stationary contact to conduct electricity and making the magnetic block closer to the Hall sensor.
2. 2 . The magnetic induction micro switch with self-calibration according to claim 1 , wherein a microcontroller unit (MCU) electrically connected to the Hall sensor and having a data storage function is provided on the PCB, the MCU is directly or indirectly connected to the movable contact and the stationary contact, and an electrical signal is sent to the MCU in a case where the movable contact engages the stationary contact to conduct electricity.
3. 3 . The magnetic induction micro switch with self-calibration according to claim 1 , wherein the base and the housing are fixed by a snap-fit connection.
4. 4 . The magnetic induction micro switch with self-calibration according to claim 1 , wherein the PCB has at least one output terminal electrically connected to the MCU, and a triggering signal is output externally by the output terminal.

Description

TECHNICAL FIELD The present application relates to the field of micro switches, and in particular, to a magnetic induction micro switch with self-calibration. BACKGROUND The existing micro switch technologies mostly adopt a single-path design, that is, a switching state is triggered through single magnetic induction. The micro switch having such a structure is generally triggered by depending on magnetic field induction between a magnetic block and a sensing device, and has the advantages of a simple structure and relatively low cost. However, in practical application, the single-path design based on magnetic induction triggering has certain technical limitations. The magnetic field intensity, direction, and distribution of each magnetic block are difficult to maintain consistent during manufacturing; in addition, during assembly, the positional relationship between the magnetic block and the sensing device often has a slight deviation. The limitation in this design makes it difficult for different micro switches to achieve consistent triggering timing, resulting in deviation in triggering time, manifested as early triggering or delayed triggering of the switch, thereby affecting response time and operation accuracy of devices. A closer analysis of the causes of this problem reveals that the micro switch triggered by magnetic induction depends on characteristics of a magnetic block, and magnetic field intensity and direction of the magnetic block inevitably exhibit subtle variations during mass production and assembly. Meanwhile, an installation position between the magnetic block and the sensing device is difficult to ensure absolutely precise consistency, and a slight deviation may cause a difference in the induction effect. Therefore, in a case where a micro switch triggered by single-path magnetic induction is used without calibration, an error in switching triggering timing is inevitably caused, affecting synchronization and consistency of the micro switch. In addition, since an existing design lacks an automatic calibration function, such an error is difficult to avoid, which not only affects reliability of operation, but also increases difficulty of subsequent adjustment and maintenance. Based on the above analysis, development of a magnetic micro switch having a self-calibration function is particularly necessary. SUMMARY To overcome at least one defect in the prior art, an objective of the present application is to provide a magnetic induction micro switch with self-calibration. The micro switch achieves a self-calibration mechanism through addition of an electric path triggered by a contact based on a magnetic path. This design can automatically adjust a relationship between a magnetic block and a sensing device to ensure accuracy and consistency of triggering timing, significantly improve the response speed and synchronization of the micro switch, and reduce requirements in production and installation processes, thereby enhancing reliability and service life of the devices. To achieve the above objective, the present application discloses a magnetic induction micro switch with self-calibration. The micro switch includes a base provided on a printed circuit board (PCB), a housing cooperating with the base to form an installation cavity, a spring sheet installed in the installation cavity of the base via a conductive support, a limiting frame connected to a movable end of the spring sheet, and an operating member cooperating with the spring sheet and partially extending out of the housing. The spring sheet is connected to the PCB through the support and a first terminal extending downward from the base, a magnetic block is installed on the movable end of the spring sheet, and the magnetic block faces a Hall sensor located on the PCB. A movable contact is provided near a front end of the spring sheet, a stationary contact opposite to the movable contact is provided on the base, and the stationary contact is connected to the PCB via a second terminal. In a case where the operating member moves, the operating member pushes the movable end of the spring sheet and a connected section toward the base, causing the movable contact to engage the stationary contact to conduct electricity and making the magnetic block closer to the Hall sensor. A microcontroller unit (MCU) electrically connected to the Hall sensor and having a data storage function is provided on the PCB, the MCU is directly or indirectly connected to the movable contact and the stationary contact, and an electrical signal is sent to the MCU in a case where the movable contact engages the stationary contact to conduct electricity. Further, the base and the housing are fixed by a snap-fit connection. Further, the PCB has at least one output terminal electrically connected to the MCU, and a triggering signal is output externally by the output terminal. Compared with the prior art, the present application at least has one of the following benefi