CN102867699A - Microswitch and manufacturing method thereof - Google Patents

Abstract

The invention discloses a microswitch. The microswitch comprises two driving electrodes, two switch electrodes, a power supply and an insulated elastic support, wherein the power supply is electrically connected with the two switch electrodes, the elastic support consists of a substrate, an inclination part and a cantilever, the inclination part extends from the substrate in an inclined manner, and the cantilever extends from the inclination part and is parallel to the substrate, each driving electrode consists of an upper driving electrode and a lower driving electrode corresponding to the upper driving electrode, each switch electrode consists of an upper switch electrode and a lower switch electrode which correspond to each other, the upper switch electrodes and the upper driving electrodes are fixedly arranged on the cantilever, the lower switch electrodes and the lower driving electrodes are fixedly arranged on the substrate, and at least one of the two driving electrodes has magnetism. The microswitch is provided with the driving electrode with magnetism, so that the driving voltage for providing static power can be reduced.

Description

Micro switch and method of manufacturing the same

【Technical field】

The invention relates to a micro switch, in particular to a micro switch driven jointly by electrostatic force and magnetic force.

【Background technique】

Chinese Patent Publication No. 1310854 discloses a micro switch, which includes a pair of drive electrodes, a pair of switch electrodes, and a DC power supply electrically connected to the drive electrodes. The electrostatic force provided by the DC power supply controls the drive electrodes to realize the switching of the two switches. open and close. However, only relying on electrostatic force as the driving force requires a large driving voltage, while the current that the micro-switch can withstand is small, and it is not easy to balance the two.

Therefore, it is necessary to design a micro switch to overcome the aforementioned deficiencies.

【Content of invention】

The technical problem to be solved by the present invention is to provide a micro switch, which can reduce the driving voltage.

In order to solve the above-mentioned technical problem, a kind of technical method that the present invention provides is: a kind of micro switch, it comprises two drive electrodes, two switch electrodes, the power supply that electrically connects two switch electrodes and the elastic support of insulation, and elastic support comprises The substrate, the inclined portion extending obliquely from the substrate, and the cantilever extending from the inclined portion and parallel to the substrate, the driving electrodes include upper driving electrodes and corresponding lower driving electrodes, the switching electrodes include corresponding upper and lower switching electrodes, and the upper switching electrodes The upper driving electrode and the upper driving electrode are fixed on the cantilever, the lower switch electrode and the lower driving electrode are fixed on the substrate, and at least one of the two driving electrodes is magnetic.

Another technical solution is: a method for manufacturing a micro switch, which is characterized by comprising the following steps: (1) injecting magnetically conductive metal powder into a mold; (2) controlling the arrangement of magnetically conductive metal powder along the mold; (3) Injection molding is used to inject thermoplastics into the mold cavity; (4) demoulding to form an elastic bracket, and the magnetically conductive metal powder forms a thin layer on the upper surface of the elastic bracket, that is, the above-mentioned upper and lower driving electrodes and upper and lower switching electrodes are formed; (5) Perform electroplating treatment on the upper and lower driving electrodes and upper and lower switching electrodes; (6) Perform magnetization treatment on the upper and lower driving electrodes.

Compared with the prior art, the micro-switch of the present invention has the following beneficial effects: the micro-switch is provided with a magnetic driving electrode, which reduces the driving voltage for providing electrostatic force.

【Description of drawings】

Fig. 1 is the perspective view of microswitch of the present invention;

FIG. 2 is a side view of FIG. 1 .

【Detailed ways】

1 and 2 illustrate a microswitch 100 according to the present invention.

Referring to FIG. 1 , the microswitch 100 includes two driving electrodes 10 , two switching electrodes 20 , a DC power supply 30 electrically connected to the two driving electrodes, and an elastic support 40 .

Please refer to Fig. 1 and Fig. 2, the plastic support 40 is made of insulating material, adopts injection molding, and it comprises base plate 41, the inclined part 42 that extends obliquely from base plate 41 and the cantilever 43 that extends from inclined part and is parallel to the base plate, cantilever 43 It has a free end 431, and the cantilever can elastically move toward the substrate under the action of external force. The base plate 41 is in the shape of a flat plate. The cantilever is located in the middle of the base plate and is approximately 1/3 of the width of the base plate. The inclined portion 42 extends from the middle of one end of the base plate.

The switching electrodes 20 include corresponding upper switching electrodes 21 and lower switching electrodes 22 , and the driving electrodes 10 include corresponding upper driving electrodes 11 and lower driving electrodes 12 . The upper switching electrode 21 and the upper driving electrode 11 are fixed on the upper side of the cantilever 43 , and the lower switching electrode 22 and the lower driving electrode 12 are fixed on the upper side of the substrate 41 . The driving electrode 10 is close to the inclined portion 42 , and the switch electrode 20 is away from the inclined portion 42 . In particular, the upper driving electrode 11 and the upper switching electrode 21 are molded at the same time to be integrated, and one end of the upper switching electrode 21 is flush with the free end 431 of the cantilever. The lower driving electrode 11 is U-shaped and just surrounds the end of the inclined portion 42 .

At least one of the upper and lower driving electrodes 11, 12 is magnetically treated, and in a preferred embodiment, both driving electrodes 10 are magnetized. The end of the upper switch electrode 21 is located directly above the lower switch electrode 22 , and a pair of ground electrodes 23 are arranged on both sides of the lower switch electrode, and the ground electrodes 23 are also fixed on the upper side of the substrate 41 . The upper and lower driving electrodes 11 and 12 are respectively connected to two ends of the DC power supply 30 . When the DC power supply is turned on, the upper and lower driving electrodes 11, 12 form a capacitor. Due to the effect of electrostatic force, the two driving electrodes have a tendency to attract each other, and the magnetic force of mutual attraction between the upper and lower driving electrodes causes the cantilever 43 to Tilt down, and finally make the upper switch electrode 21 close to the lower switch electrode 22, so that the high-frequency signal can be transmitted from the upper switch electrode 21 to the lower switch electrode 22; disconnect the DC power supply, the electrostatic force disappears, because the elastic force is greater than the magnetic force, the cantilever 43 Return to the original state, disconnect the upper and lower switch electrodes. The above has realized the function of driving the electrode control switch. By introducing a magnetic force here, the electrostatic force required to close the switch becomes smaller, that is, the voltage of the DC power supply used for driving can be reduced. In this way, the phenomenon of breakdown of the electrodes due to excessive load current and voltage of the micro-switch is avoided.

The switch electrodes 20 are made of magnetically permeable metal materials, generally iron, cobalt, nickel and other metals. The driving electrode 10 is magnetic, and it can be made of magnetically permeable metal material or metal magnetic powder. If the material is made of metal magnetic powder, the above step of magnetization is omitted. From the perspective of technology, each switch uses the same material (magnetic conductive metal material), and then magnetizes the driving electrodes, so the manufacturing process will be relatively simple.

The manufacturing method of the micro switch 100 is introduced below, which mainly includes the following steps: (1) injecting the magnetically conductive metal powder into the mold; (2) controlling the arrangement of the magnetically conductive metal powder along the mould, and the magnet absorbs the magnetically conductive metal powder to arrange , to form each switch electrode, and the driving electrode has a certain length; (3) Injection molding is used to inject thermoplastic material into the mold cavity; (4) Demolding to form an elastic bracket, and the magnetic conductive metal powder is on the elastic bracket (that is, the substrate and the upper side of the cantilever) to form a thin layer to form the upper and lower drive electrodes and the upper and lower switch electrodes; (5) electroplating the upper and lower drive electrodes and the upper and lower switch electrodes; (6) the upper and lower drive electrodes The electrodes are magnetized.

Claims (7)

1. A kind of micro switch, it comprises two drive electrodes, two switch electrodes, the power supply and the insulating elastic support that electrically connects two switch electrodes, elastic support comprises substrate, the inclined portion that extends obliquely from base plate and extends from inclined portion And parallel to the cantilever of the substrate, the driving electrodes include upper driving electrodes and corresponding lower driving electrodes, the switching electrodes include corresponding upper and lower switching electrodes, the upper switching electrodes and the upper driving electrodes are fixed on the cantilever, the lower switching electrodes and the lower driving electrodes The electrodes are fixed on the substrate, and it is characterized in that at least one of the two driving electrodes is magnetic. 2. The micro switch according to claim 1, wherein the two driving electrodes are close to the inclined portion, and the two switching electrodes are away from the inclined portion. 3. The micro switch according to claim 2, wherein the magnetic driving electrodes are made of metal magnetic powder. 4. The micro switch according to claim 2, wherein the magnetic driving electrode is made of magnetically conductive metal powder, and the driving electrode is magnetized to be magnetic. 5. The micro switch according to claim 3 or 4, characterized in that: said elastic bracket is formed by injection molding. 6. A method for manufacturing a microswitch, characterized in that it may further comprise the steps: (1) Inject magnetically conductive metal powder into the mold; (2) Control the arrangement of magnetic metal powder along the mold; (3) Injection molding is used to inject thermoplastics into the mold cavity; (4) Demoulding to form an elastic bracket, and the magnetically conductive metal powder forms a thin layer on the upper surface of the elastic bracket, that is, the above-mentioned upper and lower driving electrodes and upper and lower switching electrodes are formed; (5) Perform electroplating treatment on the upper and lower driving electrodes and the upper and lower switching electrodes; (6) Magnetize the upper and lower drive electrodes. 7. The manufacturing method of the micro switch according to claim 4, characterized in that: the magnetically conductive metal powder is controlled and arranged by magnet adsorption.

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