JP6791501B2 - Manufacturing method of micro breaker for preventing momentary interruption and micro breaker for preventing momentary interruption - Google Patents

Description

The present invention relates mainly to a microbreaker for a mobile device used as a protective element for a mobile device such as a smartphone or a tablet, and a method for manufacturing the same.
As used herein, the term "microbreaker" shall mean an ultra-small breaker having a thickness of 2 mm or less.

Portable devices have a built-in PTC, fuse, and microbreaker as battery protection elements. When the PTC becomes higher than the set temperature, the resistance value suddenly increases and cuts off the current, the fuse blows and cuts off the current when the set temperature is reached, and the micro breaker makes the movable contact a fixed contact when the set temperature is reached. Cut off the current away from. The PTC has a drawback that the low resistance value, which is the electric resistance in the non-trip state, is larger than the contact resistance of the contacts of the microbreaker, and the power loss becomes large in a large current portable device. The fuse has the drawback that once it blows, it cannot be reused thereafter. The micro breaker having this structure cannot prevent a momentary interruption in which the movable contact is separated from the fixed contact and the power is momentarily turned off due to an impact such as dropping a mobile device. In the closed state, the microbreaker has a small contact resistance value of the contact and can reduce the power loss in a large current, so that it prevents momentary interruption, which is a peculiar defect, and realizes excellent characteristics as a protective element for mobile devices.
In the present specification, the "low resistance value" which is the electric resistance in the state where the PTC does not trip means the electric resistance of the PTC at 20 ° C.

Microbreakers have been developed to prevent momentary interruptions that occur when the contacts are momentarily separated due to an impact such as dropping. (See Patent Document 1)

The breaker disclosed in Patent Document 1 is provided with a spacer in the case in order to prevent a momentary interruption in which the movable contact is separated from the fixed contact due to vibration due to an impact. The spacer prevents the PTC and the bimetal from vibrating due to an impact and prevents a momentary interruption. The microbreaker incorporates a bimetal and a PTC between the movable contact and the fixed contact, and the bimetal reverses when the set temperature is reached, separating the movable contact from the fixed contact and switching the contact off. The PTC is energized with the contacts open to heat the bimetal. The heated bimetal is held in an inverted state, holding the contacts in an open state. When a breaker with this structure receives an impact, the bimetal and PTC vibrate. Spacers are arranged to prevent vibration of bimetal and PTC. The spacer closes the gap to prevent vibration.

It is extremely difficult to assemble a structure that reduces the gap with a spacer to prevent momentary interruption due to vibration by adjusting the gap with extremely high accuracy. In particular, in a micro breaker with an overall thickness of about 1 mm and a distance between contacts of about 100 μm, a fixed contact plate, a PTC, a bimetal, and a movable contact plate are laminated inside the case, and a spacer is used to prevent vibration. It is extremely difficult to reduce the gap. This is because extremely high precision is required for parts processing and assembly. Furthermore, the micro breaker deforms the elastic arm that fixes the movable contact at the tip to switch the contact on and off, and further reverses the bimetal to switch the contact off, so space is required to deform the elastic arm, and further Since a space for reversing the bimetal is also required, it is practically extremely difficult to provide such a space and arrange the reversing bimetal and the PTC between the movable contact plate and the fixed contact plate without a gap. Further, even if the gap between the bimetal and the PTC can be eliminated, the vibration due to the impact of the elastic arm cannot be prevented. In particular, the elastic arm uses an extremely thin metal plate with a thickness of about 100 μm, and the micro breaker with a contact interval of about 100 μm when shutting off has a weak contact pressure and vibrates due to an impact such as dropping. It is not possible to prevent the momentary interruption that occurs. Therefore, even if the micro breaker can reduce the momentary interruption caused by an impact such as dropping by providing a spacer, the microbreaker cannot stably prevent the momentary interruption due to a strong impact.

The present inventor has developed a microbreaker for preventing momentary interruption in which a PTC is connected in parallel with a contact for the purpose of solving the above drawbacks. In this micro breaker, PTC is connected to a movable contact plate provided with a movable contact and a fixed contact plate provided with a fixed contact at a position facing the movable contact, and the PTC is connected in parallel with the contact. ..

In the above micro breaker, since the PTC is connected to the fixed contact plate and the movable contact plate, the PTC conducts the movable contact and the fixed contact at the moment when the movable contact separates from the fixed contact, so that a strong impact is applied. It is possible to prevent a momentary disconnection that occurs when the movable contact is separated from the fixed contact. The PTC is energized and held in a state where the contacts are connected when the contacts are separated by an impact, and when the contacts are continuously separated, heat is generated by the energized current and trips, and the electric resistance increases to generate a current. Cut off. Therefore, in a state where the contacts are temporarily separated due to an impact, the PTC connects the contacts to prevent momentary interruption, but when the contacts are continuously separated, the PTC is tripped and the breaker is shut off.

By the way, in the micro breaker, since the movable contact plate is made of an extremely thin metal plate for miniaturization, the contact pressure of the contact cannot be increased, and the weak contact pressure causes an increase in contact resistance. The contact resistance of the contacts increases the voltage drop and causes power loss. In order to reduce this adverse effect, it is extremely important for the microbreaker to reduce the contact resistance of the contacts with low contact pressure. In particular, since the microbreaker is used as a protective element for a battery, when it is used at a low voltage, the rate of power loss due to a voltage drop due to contact resistance becomes large. This is because the ratio of the voltage drop of the contact to the power supply voltage becomes large.

As a technique for reducing the contact resistance of the microbreaker, a method of activating the contacts by ultrasonic vibration has been developed. (Refer to Patent Documents 2 and 3) In this method, the micro breaker is ultrasonically vibrated while the contacts are energized, that is, the movable contacts are ultrasonically vibrated so that the movable contacts and the fixed contacts collide microscopically. Therefore, the contact portion of the contact can be activated and the contact resistance can be stabilized in a small state. The movable contact that is ultrasonically vibrated in the energized state is activated by momentarily repeating a state in which it is struck by a fixed contact and comes into contact with it, and a state in which it is slightly separated from the fixed contact. The movable contacts that are struck and separated from the fixed contacts generate sparks between the contacts in order to consume the energy of the current flowing between the contacts at the moment of leaving the fixed contacts. The spark between the contacts removes and activates the oxide film on the opposing contact surfaces and further heats the opposing contact surfaces. After that, the movable contact is struck against the fixed contact and activated in a state where the oxide film is further removed.

Japanese Unexamined Patent Publication No. 2013-110034 JP-A-2002-56755 Japanese Unexamined Patent Publication No. 2005-116511

By the way, when the contact is ultrasonically activated, the microbreaker holds the contact in an energized state and ultrasonically vibrates the contact. The micro breaker for preventing momentary interruption connects a PTC connected in parallel with the contact, and this PTC inhibits the ultrasonic activity of the contact. This is because PTC prevents the generation of sparks when the contacts are open. In the conventional micro breaker to which PTC is not connected, at the moment when the movable contact separates from the fixed contact, a spark is generated between the contacts because the energy of the current flowing between the contacts is consumed, and the contact surface facing the spark is generated. Stimulate and activate. On the other hand, in the micro breaker in which the PTC is connected in parallel with the contact, a current flows through the PTC when the contact is switched to the open state, no spark is generated between the contacts, and the contact activity due to the spark. Cannot be realized. Therefore, the microbreaker with a built-in PTC needs to disconnect the PTC from the contact when the contact is ultrasonically activated, and connect the PTC in parallel with the contact after the contact.

In order to realize this, the present inventor contacts the lead wire for connecting the PTC to the movable contact plate and the movable contact plate, provides an insulating film between them to insulate the contact, and ultrasonically activates the contacts in this state. After that, we developed a micro breaker that irradiates the lead wire with a laser beam to eliminate the insulating film by heat and weld the lead wire to the movable contact plate. This micro breaker insulates the reed wire from the movable contact plate with an insulating film, and can ultrasonically activate the contacts without connecting the PTC in parallel with the contacts. However, the micro breaker having this structure has a drawback that the lead wire cannot be stably connected to the movable contact plate and the yield is lowered. This is because the heat energy of the laser beam reliably burns the insulating film and the lead wire cannot be stably electrically connected to the movable contact plate.

The present invention has been developed for the purpose of eliminating the above-mentioned drawbacks, and an important object of the present invention is to stably connect the PTC to the contacts while ultrasonically activating the contacts to reduce the contact resistance. Then, it aims to provide the micro breaker for the momentary interruption prevention which can surely prevent the momentary interruption, and the manufacturing method thereof.

Another important object of the present invention is to provide a microbreaker capable of reliably preventing momentary interruption while mass-producing at low cost and a method for producing the same.

Means for Solving Problems and Effects of Invention

The microbreaker for preventing momentary interruption in which the contacts of the present invention are ultrasonically activated is fixed by providing a movable contact plate having a movable contact at the tip of an elastic arm and a fixed contact at a position facing the movable contact. A contact plate, a bimetal that is thermally deformed and inverted at a set temperature to open the movable contact away from the fixed contact, a PTC that is connected to the fixed contact plate and the movable contact plate, and fixed to the movable contact plate. It includes a case for fixing the contact plate and a lead wire having a welding terminal connected to the surface of the PTC and having an end portion arranged outside the case. The movable contact plate has a connection terminal arranged outside the case, the welding terminal and the connection terminal are arranged at opposite positions outside the case, and the connection terminal passes through the connection terminal and is a welding terminal. Has a notch for passing an insulating rod that presses from the connection terminal to a non-contact position.

The above micro breaker stably ultrasonically activates the contacts to reduce the contact resistance, and in the ultrasonically activated state, the lead wire is reliably connected to the movable contact plate to reliably prevent momentary interruption. There are features that can be done. That is, the above micro breaker arranges the connection terminal of the movable contact plate and the welding terminal of the lead wire at opposite positions outside the case, and the connection terminal of the movable contact plate passes through the connection terminal and is a welding terminal. This is because there is a notch for passing the insulating rod that presses the rod so that it does not come into contact with the connection terminal. In this micro breaker, the welding terminal is pressed by an insulating rod that passes through the notch provided in the connection terminal so that the welding terminal does not contact the connection terminal, and the lead wire does not connect the PTC to the movable contact plate. , The contacts can be ultrasonically activated, and after the contacts are ultrasonically activated, the welding terminal of the lead wire is connected to the connection terminal of the movable contact plate, the PTC is connected to the movable contact plate, and the PTC is reliably stable. Achieve features that can prevent momentary interruptions.

Further, in the above micro breaker, the welding terminal of the lead wire is pressed by the insulating rod to prevent the welding terminal from contacting the connection terminal of the movable contact plate. In this state, the contact is ultrasonically activated, and then the insulating rod is released. Since the welded terminal can be connected to the connection terminal without pressing the welded terminal, it is possible to mass-produce a microbreaker that can reliably prevent momentary interruption with PTC at low cost. In particular, the above micro breaker is placed at a position where it does not come into contact with the connection terminal by pressing the welding terminal with an insulating rod that passes through the notch provided in the connection terminal to deform the welding terminal. Since the PTC is separated from the contact without connecting the lead wire to the movable contact plate without providing the lead wire, the contact can be stably ultrasonically activated and the contact can be super-activated by ensuring that the welding terminal does not contact the connection terminal. After sonic activation, the welding terminal can be reliably connected by contacting the connection terminal without burning the insulating film. Therefore, the above-mentioned micro breaker realizes a feature that the contact can be reliably ultrasonically activated to reduce the contact resistance and the PTC can surely prevent the momentary interruption.

Furthermore, the above micro breaker is a PTC connected in parallel with the contacts to prevent momentary interruptions that occur when the contacts are momentarily separated. Therefore, unlike a conventional breaker, a spacer is provided inside the case to create a gap. Like a breaker that adjusts to prevent momentary interruptions, it does not require parts to be processed with high precision and assembled, and it also realizes a feature that can be mass-produced at low cost. Further, the above micro breaker is arranged at a position away from the connection terminal by pressing the welding terminal with the insulating rod, that is, the welding terminal is deformed and arranged at the non-contact position of the connection terminal, so that the lead wire is welded. It is not necessary to bend the terminals into a shape that is in the non-contact position of the connection terminals and fix them to the case, and the welded terminals can be fixed to the case and assembled as a flat shape that is laminated on the connection terminals of the movable contact plate. In the process, the lead wire is securely placed in a fixed position on the case, and the feature of efficient mass production is also realized. This is because the planar lead wire can be accurately placed and assembled in place on the case as compared to the extremely small bent lead wire.

The micro breaker for preventing momentary interruption of the present invention has a structure in which a notch is provided on the side edge of the connection terminal and the welding terminal is arranged at a non-contact position from the connection terminal with an insulating rod inserted through the notch. be able to. Further, in the micro breaker for preventing momentary interruption of the present invention, the welded terminal is not connected to the connection terminal by an insulating rod inserted into the notch recess of the notch portion, with the notch recess provided on the side edge of the connection terminal as the notch portion. The structure can be in a contact state. Further, the micro breaker for preventing momentary interruption of the present invention is an insulating rod in which the width of the welding terminal is wider than that of the connection terminal, a notch is provided on the side edge of the connection terminal, and the notch is inserted through the notch. The structure can be such that the welding terminal is in a non-contact state from the connection terminal. Furthermore, in the microbreaker for preventing momentary interruption of the present invention, a through hole is provided in the connection terminal to form a notch, and an insulating rod inserted into the notch of the through hole is used to move the welded terminal from the connection terminal to a non-contact position. It can be a structure to be arranged.

Micro breaker for short break prevention of the present invention, connects the welding terminals of the lead wires, and a metal plate that can be elastically deformed so as to place the stacking positions of the connection terminals in the non-pressed state of the insulating rod, is pressed by an insulating rod It can be deformed to a non-contact position with the terminal, and in the non-pressed state of the insulating rod, the structure can be arranged at the laminated position with the connecting terminal by the elastic restoring force.

The microbreaker for preventing momentary interruption of the present invention may have a structure in which a part of the position where the lead wire and the movable contact plate face each other is insulated by an insulating sheet. Further, the microbreaker for preventing momentary interruption of the present invention may have a structure in which the lead wire is arranged at a fixed position of the case by a positioning structure. Further, in the micro breaker for preventing momentary interruption of the present invention, the positioning structure is composed of a positioning hole provided in the lead wire and a positioning convex portion provided in the case and inserted into the positioning hole, and the positioning convex portion is formed. The structure can be such that the lead wire is placed in a fixed position on the case by inserting it into the positioning hole.

In the manufacturing method of the present invention, in the manufacturing method of the microbreaker in which the contacts are ultrasonically activated, a movable contact plate having a movable contact at the tip of the elastic arm and a fixed contact at a position facing the movable contact are provided. Fixed contact plate, bimetal that is thermally deformed at a set temperature and inverted to open the movable contact away from the fixed contact, PTC that is connected to the fixed contact plate and the movable contact plate, and the movable contact plate. To manufacture a microbreaker for preventing momentary interruption, which includes a case for fixing the fixed contact plate and a lead wire having a welding terminal connected to the surface of the PTC and having an end arranged outside the case. In the method, the movable contact plate is provided with a connection terminal arranged outside the case, the welding terminal and the connection terminal are arranged at opposite positions outside the case, and the connection terminal passes through the connection terminal. A notch is provided to pass the insulating rod that presses the welding terminal from the connection terminal to the non-contact position, and the welding terminal is pressed by the insulating rod that passes through the notch to separate the welding terminal from the connection terminal and the connection terminal is not connected. With the welded terminal placed in the contact position and the welded terminal placed in the non-contact position of the connection terminal and the lead wire not connected to the movable contact plate , the movable contact and the fixed contact are energized and ultrasonically vibrated to make the contact ultrasonic. After activation, the welding terminal is connected to the connection terminal to manufacture a micro breaker.

In the above method for manufacturing a micro breaker, the contacts are stably ultrasonically activated to reduce the contact resistance, and in the ultrasonically activated state, the lead wire is securely connected to the movable contact plate and the PTC is used. Realize the feature that can surely prevent the momentary interruption. In the above manufacturing method, the connection terminal of the movable contact plate provided in the micro breaker and the welding terminal of the lead wire are arranged at opposite positions outside the case, and are connected to the connection terminal of the movable contact plate. A notch is provided to pass the insulating rod that passes through the terminal and pushes the welded terminal away from the connection terminal to a position where it does not come into contact, and the welding terminal is pressed by the insulating rod that passes through this notch to form the connection terminal. This is because the welding terminal can be connected to the connection terminal in a state where the contact is ultrasonically activated by arranging the contact at a position where the contact does not occur and then the insulating rod does not press the welding terminal. In this manufacturing method, the welding terminal is pressed by an insulating rod that passes through the notch provided in the connection terminal of the micro breaker so that the welding terminal does not come into contact with the connection terminal, and the lead wire connects the PTC to the movable contact plate. In the non-state, the contacts can be ultrasonically activated, and after the contacts are ultrasonically activated, the welding terminal of the lead wire is connected to the connection terminal of the movable contact plate, and the PTC is connected to the movable contact plate to ensure that the PTC is used. Achieve a feature that can stably prevent momentary interruptions.

Further, in the above method for manufacturing a micro breaker, the welding terminal of the lead wire is pressed with an insulating rod so that the welding terminal does not come into contact with the connection terminal of the movable contact plate, and the contacts are ultrasonically activated in this state. Since the welded terminal can be connected to the connection terminal without the insulating rod pressing the welded terminal, it is possible to mass-produce a microbreaker that can reliably prevent momentary interruption by PTC at low cost. In particular, in the above manufacturing method, the welding terminal is deformed by pressing the welding terminal with an insulating rod that passes through the notch provided in the connection terminal of the microbreaker, and the welding terminal is placed at a position where it does not come into contact with the connection terminal. Since the PTC is separated from the contact without connecting the welded terminal of the lead wire to the movable contact plate without providing a film, the contact can be stably ultrasonically activated so that the welded terminal does not contact the connecting terminal reliably. In addition, after ultrasonically activating the contacts, the welding terminals can be reliably connected by contacting the connection terminals without burning the insulating film. Therefore, the micro breaker manufactured by the above method can reliably connect the contacts. It has the characteristics that it activates ultrasonic waves to reduce contact resistance, and that PTC can reliably prevent momentary interruptions.

Furthermore, in the above manufacturing method, the PTC is connected in parallel with the contacts to manufacture a micro breaker that prevents the contacts from being momentarily separated from each other, so that the case is similar to the conventional breaker manufacturing method. It also realizes the feature that micro breakers can be mass-produced at low cost without the need to process and assemble parts with high precision, like the method of manufacturing breakers that arranges spacers inside and adjusts gaps to prevent momentary interruptions. To do. Further, in the above manufacturing method, the welding terminal is pressed by the insulating rod and arranged at a position away from the connection terminal, that is, the welding terminal is deformed and arranged at a non-contact position of the connection terminal, so that the lead wire is welded. It is not necessary to bend the terminal into a shape that makes it a non-contact position of the connection terminal and fix it to the case, and it can be assembled by fixing it to the case as a flat shape in which the welded terminal is laminated on the connection terminal of the movable contact plate. In the process, the lead wire is securely placed in the fixed position of the case, and the feature that the micro breaker can be efficiently mass-produced is also realized. This is because the planar lead wire can be accurately placed in place on the case to assemble the microbreaker, as compared to the extremely small bent lead wire.

It is a schematic block diagram of a conventional micro breaker. It is a schematic block diagram of the micro breaker of this invention. It is the schematic sectional drawing of the micro breaker which concerns on one Example of this invention. It is sectional drawing of the micro breaker shown in FIG. It is the schematic sectional drawing of the micro breaker which concerns on other Examples of this invention. FIG. 5 is a schematic cross-sectional view showing a step of activating the contacts of the micro breaker shown in FIG. It is sectional drawing of the micro breaker shown in FIG. It is a figure which shows the state which the contact of a micro breaker is switched to an open state, and the electric resistance of PTC changes. It is a process diagram which shows the manufacturing process of the micro breaker shown in FIG. It is a top view of the micro breaker which concerns on embodiment of this invention. It is a top view of the micro breaker which concerns on other Examples of this invention. It is a top view of the micro breaker which concerns on other Examples of this invention.

Hereinafter, examples of the present invention will be described with reference to the drawings. However, the examples shown below exemplify a microbreaker for preventing momentary interruptions for embodying the technical idea of the present invention, and the present invention uses the following microbreakers for preventing momentary interruptions. Not specified. Furthermore, this specification never specifies the members shown in the claims as the members of the examples.

The microbreaker of the present invention is mainly used as a protective element in mobile devices such as mobile phones, tablets, and laptop computers. This micro breaker is connected in series with a secondary battery for power supply and is used as a protective element that cuts off current due to an abnormal temperature rise. The micro breaker is built into the battery pack of a mobile device as a protective element. Battery packs are required to be as thin as possible in order to make mobile devices thinner. The thin battery pack contains a laminated battery and a thin square battery to make the whole thinner, and a micro breaker is placed on the terrace of the laminated battery and the position facing the sealing plate of the thin square battery to make the whole. It's thin. The micro breaker is manufactured so as not to protrude from the surface of the laminated battery. For this reason, the microbreaker built in the battery pack of a mobile device is restricted in thickness, and the thickness of a commonly used microbreaker is extremely thin, about 1 mm. This micro breaker incorporates a movable contact plate, a bimetal, a PTC, and a fixed contact plate in a case at predetermined intervals to make the overall thickness extremely thin, about 1 mm, and thus has various restrictions on the structure and manufacturing process. In response to this, for example, an extremely thin metal plate is used for the movable contact plate in which the movable contact is fixed to the tip, and the contact pressure of the contact cannot be maintained high. The movable contact plate has a movable contact fixed to the tip of an elastic arm, and is switched on when the movable contact is in contact with the fixed contact and off when the contact is released. The movable contact fixed to the tip of the elastic arm of a thin metal plate has a low contact pressure, and when it receives a strong impact, it separates from the fixed contact and is momentarily switched off, causing a momentary interruption.

1 and 2 are schematic views showing the operating principle of the conventional microbreaker (FIG. 1) and the microbreaker of the present invention (FIG. 2).
In the conventional micro breaker shown in FIG.
(1) shows the energized state of the breaker when the ambient temperature is lower than the set temperature.
In this state, the bimetal 96 is in the non-inverted state and the contact 90 is closed.
(2) indicates a state in which the ambient temperature becomes higher than the set temperature and the breaker cuts off the current.
In this state, the bimetal 96 is inverted to open the contact 90.
(3) shows a state in which the contact 90 is opened by vibration.
In this state, the bimetal 96 is in the non-inverted state and the contact 90 is in the open state.

In the conventional micro breaker, when an impact is received in a state where the ambient temperature is lower than the set temperature, the contact 90 is opened and the current is cut off as shown in (3). In this state, the bimetal 96 is not inverted, and the contacts 90 are not connected via the PTC 97. In this state, the current is cut off when the ambient temperature is lower than the set temperature, causing a momentary interruption.

In the microbreaker of the present invention shown in FIG.
(1) shows the energized state of the breaker when the ambient temperature is lower than the set temperature.
In this state, the bimetal 6 is in the non-inverted state and the contact 10 is closed.
The PTC 7 and the contact 10 are connected in parallel and energized.
Therefore, in this state, the breaker current splits and flows between the contact 10 and the PTC 7, but the contact resistance of the contact 10 is smaller than the low resistance value of the PTC 7, and most of the breaker current flows through the contact 10.

(2) shows a state in which the contact 10 is opened when the ambient temperature becomes higher than the set temperature.
In this state, the bimetal 6 is inverted to open the contact 10, but since the PTC 7 is connected in parallel with the contact 10, the PTC 7 is energized, the PTC 7 is heated by an electric current and trips, and the electric resistance suddenly increases. It increases and effectively cuts off the current.

(3) shows a state in which the contact 10 is opened by vibration.
In this state, the bimetal 6 is in the non-inverted state, and the contact 10 is in the open state.
The PTC 7 is connected in parallel with the contact 10, but the electrical resistance of the non-tripped PTC 7 is small, and the current flowing through the contact 10 flows through the PTC 7. Therefore, even if the contact 10 is momentarily opened, the breaker does not cut off the current. When the contacts 10 are continuously in the open state, the PTC 7 trips and the electric resistance of the PTC 7 suddenly increases to cut off the current, but the contact 10 has an extremely short time to open the contacts 10 due to an impact. The PTC7 does not trip in the state. Therefore, even if the contact 10 is opened due to vibration, a current flows through the PTC 7 to prevent a momentary interruption.

The micro breaker of FIG. 2 uses the built-in self-holding PTC7X for the PTC7, but as shown by the chain line of FIG. 1, the PTC7 is connected to the outside of the conventional breaker to prevent a momentary interruption. You can also.

3 to 5 show schematic cross-sectional views of the microbreaker according to the embodiment of the present invention.
These micro breakers have a movable contact plate 1 having a movable contact 3 provided at the tip of the elastic arm 5, a fixed contact plate 2 having a fixed contact 4 provided at a position facing the movable contact 3, and an ambient temperature. It includes a bimetal 6 that reverses when the temperature rises to a set temperature and separates the movable contact 3 from the fixed contact 4 to open it, and a PTC 7 that is connected to the fixed contact plate 2 and the movable contact plate 1.

In the micro breakers shown in these figures, the movable contact plate 1 and the fixed contact plate 2 are fixed to the plastic case 8 in a facing posture, and the bimetal is formed between the movable contact plate 1 and the fixed contact plate 2. 6 and PTC 7 are arranged. The case 8 is provided with a hollow portion 9 inside. The elastic arm 5, the bimetal 6, the PTC 7, and the fixed contact plate 2 of the movable contact plate 1 are arranged in the hollow portion 9.

In the movable contact plate 1, the elastic arm 5 provided at the tip portion is arranged in the hollow portion 9 of the case 8, the intermediate portion is fixed to the peripheral wall 8A of the case 8, and the rear end portion is projected to the outside of the case 8. A connection terminal 11 is provided on the outside of the.

The fixed contact plate 2 is arranged in a hollow portion 9 provided in the case 8, the fixed contact 4 is arranged at a position facing the movable contact 3 of the elastic arm 5, and the tip portion is arranged at the bottom of the case 8. The rear end portion protrudes to the outside of the case 8 to form a connection terminal 12 on the fixed contact side.

The PTC 7 has both a self-holding action of energizing the bimetal 6 in the open state of the contact and heating the bimetal 6 to hold the contact 10 in the open state, and preventing a momentary interruption when the contact 10 is momentarily opened. It is also used for the action of. In other words, the PTC 7 is connected to the movable contact plate 1 via the lead wire 14, and the PTC 7 is used for both self-holding and instantaneous interruption prevention.

When the temperature is lower than the set temperature, the PTC 7 has a low resistance value, and when the temperature is higher than the set temperature, the PTC 7 trips and the electric resistance rapidly increases to become a current cutoff resistance value, and almost no current flows. Therefore, the tripping PTC 7 is substantially in an open state in which the current is cut off. When the contact 10 is in the open state, the PTC 7 is energized to heat the bimetal 6 and keep the contact 10 in the open state. When the PTC 7 is energized and reaches the trip temperature, the current is cut off, and when the temperature drops to the trip temperature, the resistance value becomes low again. Therefore, the PTC 7 is maintained at the trip temperature when the contact 10 is open. The PTC 7 held at the trip temperature heats the bimetal 6 and holds it in an inverted state to hold the contact 10 in an open state.

The PTC 7 connected in parallel with the contact 10 is in a low resistance state at the time of momentary interruption when the contact 10 is momentarily opened. This is because the temperature of the PTC 7 is lower than the trip temperature at the time of momentary interruption when the contact 10 is momentarily opened. Since the PTC 7 has a low resistance and a low resistance value in a state where the contact 10 is continuously closed, the current of the breaker flows through both the low resistance PTC 7 and the contact 10. The current ratio between the contact 10 and the PTC 7 is specified by the ratio of the contact resistance of the contact 10 to the low resistance value of the PTC 7. When the low resistance value of the PTC 7 is large, the current of the PTC 7 becomes small and the current of the contact becomes large. The PTC7 can reduce the current and reduce the temperature rise. This is because the calorific value of PTC7 is the product of the square of the current and the low resistance value. In the closed state of the contact 10, the PTC 7 is required to reduce the temperature rise due to the current. Since the current of the PTC 7 is specified by the ratio of the low resistance value of the PTC 7 to the contact resistance of the contact 10, the low resistance value of the PTC 7 is set to the optimum resistance value in consideration of the contact resistance of the contact 10.

The contact resistance of the ultrasonically activated contact 10 in the closed state is as small as 15 mΩ or less. In particular, the contact resistance of the contact 10 is made small and stable by the ultrasonic activation treatment. In a state where the PTC 7 is connected in parallel to the contact 10, the resistance of the PTC 7 can be made larger than the contact resistance of the contact 10, the current of the PTC 7 can be made smaller, and the heat generated by the PTC 7 due to the current can be made smaller. In order to reduce heat generation due to the current of PTC7, the low resistance value of PTC7 is, for example, 20 mΩ or more, preferably 30 mΩ or more, and more preferably 50 mΩ or more. The low resistance value of the PTC 7 is 20 mΩ or more, the contact resistance in the closed state of the contact 10 is 15 mΩ or less, and the current of the PTC 7 can be 1/4 or less of the contact current in the closed state of the contact 10. By increasing the low resistance value of PTC7 with respect to the contact resistance of contact 10, the current of PTC7 in the closed state of contact 10 can be reduced. Therefore, the low resistance value of PTC7 is preferably 10 times or more the contact resistance of contact 10. , 1/10 or less of the current of the contact 10. The low resistance value of PTC 7 becomes the internal resistance of the breaker in a state where the contact 10 is temporarily opened by an impact. This is because all the breaker current flows through the PTC 7. If the low resistance value of the PTC 7 is too large, the internal resistance of the breaker in the open state of the contact 10 becomes large, and it becomes difficult to reliably and stably prevent the momentary interruption. From this, the low resistance value of PTC7 is set to 4Ω or less, preferably 500mΩ or less, and more preferably 300mΩ or less.

The trip temperature of the PTC 7 is set higher than the temperature at which the built-in bimetal 6 reverses and switches the contact 10 to the open state to cut off the current, that is, the set temperature of the microbreaker. This is because if the PTC 7 trips while the contact 10 is momentarily opened due to an impact, the electrical resistance of the PTC 7 increases and the micro breaker cannot be prevented from being interrupted.

FIG. 7 shows a state in which the electrical resistance of the PTC changes when the contact point of the microbreaker is momentarily switched to the open state by the chain line B. In this figure, the horizontal axis is the time axis, and the vertical axis shows the on / off of contacts (solid line A) and the characteristic that the electrical resistance of PTC changes (chain line B). However, the solid line A indicates a state in which the ambient temperature becomes higher than the set temperature and the contacts are continuously switched to the open state. As shown in this figure, the PTC shows a low resistance value that does not trip when the ambient temperature becomes higher than the set temperature, the bimetal is inverted and the contacts are switched to the open state. This is because the trip temperature of PTC is higher than the set temperature of the micro breaker. In this state, the microbreaker current flows through the PTC. The PTC current heats the PTC to raise its temperature. When the temperature of PTC rises above the trip temperature, the electrical resistance rapidly increases and the PTC exhibits a high resistance value. The high resistance PTC limits the microbreaker's current significantly smaller.

The alternate long and short dash line C in FIG. 7 shows a momentary interruption state in which the contacts are momentarily switched to the open state by an impact. In the micro breaker, the movable contact vibrates and the contact is temporarily interrupted, so that the instantaneous interruption may occur multiple times. Even in a plurality of momentary interruptions, the total time (T) (where T = T1 + T2) for adding the instantaneous interruption times (T1, T2) is about several msec or less. The trip time (Tp) of the PTC is set longer than the total time (T) at which the contacts are momentarily interrupted, for example, longer than 10 msec, preferably longer than 100 msec, and even more preferably longer than 1000 msec. This is because if the trip time (Tp) of the PTC is shorter than the momentary interruption time (T1, T2), the PTC trips in a state where the contacts are momentarily interrupted, and the momentary interruption cannot be prevented.

The trip time (Tp) of PTC changes depending on the calorific value of PTC. As the calorific value increases, the temperature rise becomes steeper and the trip time (Tp) becomes shorter. The electrical resistance of PTC affects the calorific value, and the calorific value increases in proportion to the electrical resistance. Since the PTC has a low resistance value in a state where the contacts are momentarily interrupted, the PTC can reduce the low resistance value and increase the trip time (Tp). The PTC can set the low resistance value to 4Ω or less, preferably 500mΩ or less, more preferably 300mΩ or less, and make the trip time (Tp) longer than the total time (T) of the momentary interruption.

The calorific value of the PTC 7, that is, the temperature rise is specified by the current flowing through the PTC 7 in the open state of the contact 10 and the low resistance value. The temperature rise of PTC7 specifies the trip time, and when the calorific value becomes large and the temperature rise becomes steep, the trip time becomes short. Therefore, the low resistance value of PTC7 specifies the calorific value, and the calorific value specifies the trip time. Therefore, the low resistance value of the PTC 7 is set to a resistance value that makes the time until the PTC 7 trips in the open state of the contact 10 longer than the instantaneous open time of the contact 10.

The time for the microbreaker to momentarily open the contact 10 when it receives an impact varies depending on the length of the elastic arm 5, the material and thickness of the movable contact plate 1 , the magnitude of the impact, etc., but is usually several msec or less. Is. The trip time of the PTC 7 is shorter than the time when the contact 10 momentarily opens due to the impact. Therefore, even if the contact 10 is momentarily opened, the PTC 7 does not trip in the open state of the contact 10, and a low resistance PTC 7 is connected to the contact 10 that opens momentarily to prevent a momentary interruption. Will be done.

The bimetal 6 is arranged between the PTC 7 and the movable contact plate 1 . The bimetal 6 is made by laminating dissimilar metal plates having different coefficients of thermal expansion, and is in a non-inverted state when the ambient temperature is lower than the set temperature. When the ambient temperature becomes higher than the set temperature, the bimetal 6 reverses and pushes up the elastic arm 5 to make contact. Set 10 to the open state. The bimetal 6 in the non-reversed state does not push up the elastic arm 5, and closes the contact 10. As shown in FIGS. 3 to 5, the bimetal 6 is curved so that the central portion protrudes toward the elastic arm 5. When the ambient temperature becomes higher than the set temperature and reverses, the elastic arm 5 is pushed up to open the contact 10. As shown in FIG. 2 (2), the inverted bimetal 6 is deformed into a shape in which the central portion protrudes downward and pushes up the elastic arm 5 to open the contact 10.

The PTC7s of the microbreakers of FIGS. 3 to 5 are provided with electrodes at the top and bottom in the figure, and one electrode is connected to the movable contact plate 1 and the other electrode is connected to the fixed contact plate 2. In the figure, the PTC 7 has one electrode directly connected to the fixed contact plate 1 and the other electrode connected to the movable contact plate 1 via the lead wire 14. The lead wire 14 is a conductive metal plate. The lead wire 14 is provided with a welding terminal 19 arranged outside the case at an end thereof. One end of the lead wire 14 is connected to the PTC 7, the welding terminal 19 at the other end is connected to the movable contact plate 1, and the PTC 7 is connected to the movable contact plate 1. The welding terminal 19 is not connected to the movable contact plate 1 when the contacts are ultrasonically activated. At this timing, the welding terminal 19 is pushed by the insulating rod 98 and deformed so as not to be connected to the movable contact plate 1. The welding terminal 19 is a metal plate that can be elastically deformed so as to return to the laminated position of the connection terminals 11 of the movable contact plate 1 in a non-pressed state in which the insulating rod 98 is pushed and deformed, but the insulating rod 98 is not pressed. The lead wire 14 is elastically deformed in the pressed state of the insulating rod 98 and deformed to a non-contact position with the connection terminal 11, but in the non-pressed state of the insulating rod 98, the lead wire 14 is elastically restored to the connection terminal 11. Is arranged at the stacking position of the above, and is securely connected to the connection terminal 11.

For the connection between the electrode of PTC 7 and the lead wire 14 and the fixed contact plate 2, soldering, welding, adhesion, adhesion with a conductive adhesive, or the like can be used. Adhesion can be performed with a conductive adhesive, or with a non-conductive adhesive in a state where the lead wire 14 and the metal plate are laminated in a contact state and electrically connected.

In the micro breakers of FIGS. 3 to 5, the PTC 7 built in the case 8 is used for both self-holding and instantaneous interruption prevention. The lower electrode 7a of the PTC 7 is used as the fixed contact plate 2, and the upper electrode 7b is used. It is connected to the movable contact plate 1 via the lead wire 14. FIG. 3 is a schematic cross-sectional view of the micro breaker shown in FIG. The lower electrode 7a of the PTC 7 is connected to the upper surface of the fixed contact plate 2 by soldering, welding, adhesion, or the like. The upper electrode 7b of the PTC 7 is connected to the movable contact plate 1 via a lead wire 14. The upper electrode 7b is connected to the lead wire 14 by a method such as soldering, welding, or bonding, and the lead wire 14 and the movable contact plate 1 are connected by a method such as soldering, welding, bonding, or caulking.

After the microbreakers of FIGS. 3 and 4 are assembled and the contacts are ultrasonically activated, the welding terminal 19 of the lead wire 14 is connected to the connection terminal 11 of the movable contact plate 1 outside the case 8. The end of the lead wire 14 is pulled out of the case 8. The welded terminal 19 ultrasonically activates the contact 10 without being connected to the movable contact plate 1, then is connected to the connection terminal 11, and the lead wire 14 is connected to the movable contact plate 1.

The contacts of the microbreaker are ultrasonically activated in the state shown in FIG.
In the step of performing ultrasonic activation processing, the movable contact plate 1 and the fixed contact plate 2 are connected to the power supply 30, and the movable contact and the fixed contact are maintained in an energized state. A DC power supply is suitable for the power supply 30, but a low-frequency AC power supply can also be used. In order to energize the contacts, the power supply terminals are pressed against the connection terminals 11 and 12 of the movable contact plate 1 and the fixed contact plate. In this energized state, the PTC 7 is not connected in parallel with the contacts. This is because when the PTC 7 is connected in parallel with the contact, a current flows through the PTC 7 in the open state of the contact, sparks are not generated at the contacts, and wave activation of the contacts by spark cannot be realized. In order to separate the PTC 7 from the contact, the insulating rod 98 presses and deforms the welding terminal 19. The welding terminal 19 that is pushed by the insulating rod 98 and deforms is separated from the connection terminal 11 and is not connected. The insulating rod 98 passes through the notch S provided in the connection terminal 11 and presses the end portion of the welding terminal 19 in order to surely separate the welding terminal 19 from the connection terminal 11.

In order for the insulating rod 98 to pass through the notch S of the connection terminal 11 and press the welding terminal 19 so that the welding terminal 19 does not come into contact with the connection terminal 11, the notch S is provided in the connection terminal 11. It is provided. 9 to 11 are plan views of a microbreaker in which a notch portion S is provided in the connection terminal 11. The connection terminals of FIGS. 9 and 10 are provided with a notch S at the side edge. An insulating rod 98 indicated by a chain wire is inserted through the notches S on both sides, and the insulating rod 98 presses the welding terminal 19 to be arranged at a non-contact position from the connection terminal.

The micro breaker of FIG. 9 is deformed by inserting an insulating rod 98 into the notch recess provided on the side edge of the connection terminal 11 as a notch portion S and pressing the welding terminal 19 with the insulating rod 98. Then, the deformed welding terminal 19 is brought into a non-contact state in which it does not contact the connection terminal 11. In the micro breaker of FIG. 10, the width of the welding terminal 19 is wider than that of the connection terminal 11, and the notch portion S is provided on the side edge of the connection terminal 11. As shown by the chain wire, this micro breaker passes the insulating rods 98 on both sides of the connecting terminal 11, presses the welding terminal 19 with the insulating rod 98 to deform, and contacts the deformed welding terminal 19 with the connecting terminal 11. Do not make contact. As shown in FIGS. 9 and 10, a structure in which notches S are provided on both sides of the connection terminal 11 and a pair of insulating rods 98 are inserted through the notches S to deform the welding terminal 19 is a welding terminal. By pressing 19 at two points on both sides, it can be reliably and stably deformed into a shape that does not come into contact with the connection terminal 11. In the micro breaker of FIG. 11, a through hole is provided in the connection terminal 11 to form a notch S. As shown by the chain wire, this micro breaker inserts the insulating rod 98 into the through hole of the connection terminal 11, presses the welding terminal 19 with the insulating rod 98 to deform, and attaches the deforming welding terminal 19 to the connection terminal 11. It is in a non-contact state without contact.

Ultrasonic vibration in which the welding terminal 19 is pressed by the insulating rod 98, the PTC 7 is not connected to the movable contact plate 1, the power supply 30 is connected to the contact 10, and the contact is energized, and the contact is pressed against the surface of the microbreaker. The child vibrates the micro breaker ultrasonically. The ultrasonically vibrated microbreaker switches the contacts between the closed and open states. A current flows through the contact 10 in the closed state, and a spark is generated at the moment when the contact 10 is switched to the open state. The contact 10 that vibrates ultrasonically repeats a closed state and an open state in a short cycle. Spark is generated by inducing a high voltage between the contacts by the energy of the electric current at the moment when the contact 10 is opened. Sparks are generated on the facing surfaces of the contacts 10 and activate the contact surfaces of the contacts 10. The spark consumes the energy of the current stored in the inductance (not shown) of the closed circuit between the contacts and the power supply. Since the activation of the contact 10 is realized by inducing a high voltage between the contacts with the energy of the electric current and discharging the high voltage, it is necessary to insulate the contacts. If the PTC 7 is connected in parallel between the contacts, a current flows through the PTC 7, so discharge due to a high voltage does not occur and the contact 10 cannot be activated. Therefore, the PTC 7 is movable in the process of ultrasonically activating the contacts. It is held in a state where it is not connected to the contact plate 1.

In the micro breaker, the welding terminal 19 is connected to the connection terminal 11 in the next step after the ultrasonic activity of the contact is completed. In the process of connecting the welding terminal 19 to the connection terminal 11, the insulating rod 98 does not press the welding terminal 19. The non-pressed welded terminal 19 that is not pressed by the insulating rod 98 is arranged at a position where it is laminated with the connection terminal 11 by an elastic restoring force, and is arranged at a position that is substantially in close contact with the connection terminal 11. The welding terminal 19 can be reliably connected to the connection terminal 11 by irradiating the laser beam.

The lead wire 14 is arranged at a fixed position of the case 8 in the positioning structure 18. The positioning structure 18 shown in FIGS. 3 and 4 is composed of a positioning hole 18A provided in the lead wire 14 and a positioning convex portion 18B provided in the lower case 8Y and inserted into the positioning hole 18A. The lead wire 14 is arranged at a fixed position in the case 8 by inserting the positioning protrusion 18B into the positioning hole 18A.

The micro breakers of FIGS. 3 and 4 are fixed by sandwiching the lead wire 14 and the movable contact plate 1 with the peripheral walls 8A of the upper case 8X and the lower case 8Y. In order to insulate the lead wire 14 and the movable contact plate 1 in the assembled state, an insulating sheet 17 is sandwiched between the lead wire 14 and the movable contact plate 1 and fixed to the peripheral wall 8A. In the micro breaker shown in the figure, the insulating sheet 17 is provided from the position where the lead wire 14 faces the movable contact plate 1 to the facing surface between the bimetal and 6. The insulating sheet 17 is a thermoplastic plastic sheet and is provided by adhering to the surface of the lead wire 14. The insulating sheet 17 is made of a material and a thickness of an insulating voltage that can withstand a high voltage generated between the movable contact plate 1 and the lead wire 14 in the activation process of the contact 10. For example, the insulating sheet 17 is a plastic sheet of 5 μm to 50 μm such as polyimide amide. The lead wire 14 is provided with a non-insulating portion 19a in which the insulating sheet 17 is not laminated at the tip of the welding terminal 19 drawn out from the case 8. The non-insulated portion 19a is connected to the connection terminal 11 after ultrasonically activating the contacts.

The micro breaker of FIG. 5 is embedded in the case apart from the movable contact plate 1 without laminating the lead wire 14 on the movable contact plate 1. In this micro breaker, the lead wire 14 and the movable contact plate 1 are bonded to each other with an insulating adhesive and fixed to the case. In FIG. 5, in order to clarify the state of insulation between the lead wire 14 and the movable contact plate 1, the lead wire 14 and the movable contact plate 1 are embedded in a case considerably separated from each other, but the actual micro breaker is The lead wire 14 and the movable contact plate 1 are arranged close to each other at the minimum interval that can realize an insulating state, and the welding terminal 19 and the connection terminal 11 are arranged close to each other at a laminated position. This micro breaker is manufactured, for example, by adhering a lead wire 14 and a movable contact plate 1 with an insulating adhesive or hot melt and fixing them to a case.

The microbreakers of FIGS. 3 and 4 are preferably assembled in the process of FIG.
(1) Cream solder is supplied to the upper surface of the fixed contact plate 2 which is insert-molded and fixed to the lower case 8Y.
(2) The PTC 7 is placed on the fixed contact plate 2 to which the cream solder is attached, and the cream solder is brought into close contact with the fixed contact plate 2 and the lower electrode 7a of the PTC 7.
(3) Cream solder is supplied to the upper electrode 7b of the PTC 7.
(4) Set the lead wire 14 on the PTC 7. In order to set the lead wire 14 in the fixed position of the lower case 8Y, the lead wire 14 is provided with a through hole of the positioning hole 18A, and the lower case 8Y is provided with a positioning convex portion 18B at the insertion position of the positioning hole 18A. .. The positioning protrusion 18B is inserted into the positioning hole 18A, and the lead wire 14 is set at a fixed position in the lower case 8Y. The cream solder supplied to the upper electrode 7b of the PTC 7 is brought into close contact with the upper electrode 7b and the lead wire 14.
In the above state, the assembly part 20 is formed by setting the PTC 7 and the lead wire 14 in the lower case 8Y fixing the fixed contact plate 2.
(5) The assembled part 20 in which the upper case is not set is placed in the reflow furnace 31 and heated to melt the cream solder, and the lower electrode 7a of the PTC 7 is connected to the fixed contact plate 2 and the upper electrode 7b of the PTC 7 is led. Reflow solder to the wire 14 to fix it.
(6) The movable contact plate 1 is set on the lead wire 14 fixed by reflow soldering. At this time, the insulating sheet 17 is laminated between the lead wire 14 and the movable contact plate 1. The insulating sheet 17 is a laminated portion of the lead wire 14 and the movable contact plate 1, and is arranged in a region excluding the non-insulating portion 19a which is the tip end portion of the welding terminal 19. Further, a bimetal 6 is arranged between the PTC 7 and the movable contact plate 1. After that, the upper case 8X is set, and the upper case 8X is fixed to the lower case 8Y. The upper case 8X and the lower case 8Y are fixed by ultrasonically vibrating to weld the peripheral wall or by adhering them with an adhesive.
(7) The welded terminal 19 of the lead wire 14 drawn out from the case 8 is pressed by the insulating rod 98 in the direction indicated by the arrow to be deformed, and the non-insulated portion 19a of the welded terminal 19 is separated from the movable contact plate 1. The contact 10 is ultrasonically activated in an insulated state in which the welding terminal 19 of the lead wire 14 is not connected to the connection terminal 11 of the movable contact plate 1.
(8) After the contact 10 is activated, the lead wire 14 is irradiated with a laser beam while the non-insulated portion 19a of the welding terminal 19 is laminated on the movable contact plate 1, and the lead wire 14 is placed on the movable contact plate 1. Connect to. Although not shown, the welding terminal 19 can be more reliably connected to the connection terminal 11 by pressing the welding terminal 19 against the connection terminal 11 to irradiate the laser beam while irradiating the laser beam.

Although not shown, the micro breaker can be connected by caulking the laminated portion of the welding terminal 19 and the connection terminal 11, and is electrically connected to each other via a connector penetrating the welding terminal 19 and the connection terminal 11. It can be connected, and further, the welding terminal 19 and the connection terminal 11 can be spot-welded and connected.

The micro breaker of the present invention can be suitably used as a protective element in mobile devices such as smartphones and tablets as a breaker capable of preventing momentary interruptions that occur when contacts are momentarily separated due to an impact such as dropping.

1 ... Movable contact plate 2 ... Fixed contact plate 3 ... Movable contact 4 ... Fixed contact 5 ... Elastic arm 6 ... Bimetal 7 ... PTC
7a ... Lower electrode 7b ... Upper electrode 8 ... Case 8X ... Upper case 8Y ... Lower case 8A ... Peripheral wall 9 ... Hollow part 10 ... Contact 11 ... Connection terminal 12 ... Connection terminal 14 ... Lead wire 17 ... Insulation sheet 18 ... Positioning structure 18A ... Positioning hole 18B ... Convex part 19 ... Welding terminal 19a ... Non-insulated part 20 ... Assembled parts 30 ... Power supply 31 ... Reflow furnace 90 ... Contact 96 ... Bimetal 97 ... PTC
98 ... Insulation rod S ... Notch

Claims (10)

It is a micro breaker that activates the contacts with ultrasonic waves to prevent momentary interruptions.
A movable contact plate with a movable contact at the tip of the elastic arm,
A fixed contact plate provided with a fixed contact at a position facing the movable contact,
A bimetal that is thermally deformed and inverted at a set temperature to separate the movable contact from the fixed contact and open it.
A PTC formed by connecting the fixed contact plate and the movable contact plate,
A case in which the movable contact plate and the fixed contact plate are fixed,
It comprises a lead wire connected to the surface of the PTC and having a welded terminal having an end arranged outside the case.
The movable contact plate has a connection terminal arranged outside the case.
The welding terminal and the connecting terminal are arranged at opposite positions outside the case.
A micro breaker for preventing momentary interruption, wherein the connection terminal has a notch for passing an insulating rod that passes through the connection terminal and presses the welding terminal from the connection terminal to a non-contact position. The micro breaker for preventing momentary interruption according to claim 1.
The notch is provided on the side edge of the connection terminal, and the insulating rod inserted through the notch is for preventing instantaneous interruption so that the welding terminal is arranged at a non-contact position from the connection terminal. Micro breaker. The micro breaker for preventing momentary interruption according to claim 2.
The notch is a notch recess in which the connection terminal is provided on the side edge, and the insulating rod inserted into the notch recess causes the welding terminal to be in a non-contact state from the connection terminal. Micro breaker for prevention. The micro breaker for preventing momentary interruption according to claim 2.
The width of the welding terminal is wider than that of the connection terminal, the notch is provided on the side edge of the connection terminal, and the insulating rod inserted into the notch does not remove the welding terminal from the connection terminal. A micro breaker for preventing momentary interruptions that makes it in contact. The micro breaker for preventing momentary interruption according to claim 1.
The notch is a through hole provided in the connection terminal, and the insulating rod inserted into the through hole is for preventing momentary interruption so that the welding terminal is arranged at a non-contact position from the connection terminal. Micro breaker. The micro breaker for preventing momentary interruption according to any one of claims 1 to 5.
The welded terminal is a metal plate that is elastically deformable and is arranged at a laminated position of the connection terminal in the non-pressed state of the insulating rod. The welded terminal is elastically deformed in the pressed state of the insulating rod and is not connected to the connection terminal. A micro breaker for preventing momentary interruption, which is deformed to a contact position and is arranged at a laminated position with the connection terminal by an elastic restoring force in a non-pressed state of the insulating rod. The micro breaker for preventing momentary interruption according to any one of claims 1 to 6.
A micro breaker for preventing momentary interruption, wherein the lead wire is formed by insulating a part of the position facing the movable contact plate with an insulating sheet. The micro breaker for preventing momentary interruption according to any one of claims 1 to 7.
A micro breaker for preventing momentary interruption, wherein the lead wire is arranged at a fixed position of the case in a positioning structure. The micro breaker for preventing momentary interruption according to claim 8.
The positioning structure is composed of a positioning hole provided in the lead wire and a positioning convex portion provided in the case and inserted into the positioning hole, and the positioning convex portion is inserted into the positioning hole. A micro breaker for preventing momentary interruption, characterized in that the lead wire is arranged at a fixed position in the case. It is a method of manufacturing a micro breaker that ultrasonically activates the contacts.
A movable contact plate with a movable contact at the tip of the elastic arm,
A fixed contact plate provided with a fixed contact at a position facing the movable contact,
A bimetal that is thermally deformed and inverted at a set temperature to separate the movable contact from the fixed contact and open it.
A PTC formed by connecting the fixed contact plate and the movable contact plate,
A case in which the movable contact plate and the fixed contact plate are fixed,
It comprises a lead wire connected to the surface of the PTC and having a welded terminal whose end is arranged outside the case.
The movable contact plate has a connection terminal arranged outside the case.
The welding terminal and the connecting terminal are arranged at opposite positions outside the case.
The connection terminal has a notch for passing an insulating rod that passes through the connection terminal and presses the welding terminal from the connection terminal to a non-contact position.
The welding terminal is pressed by an insulating rod passing through the notch portion to separate the welding terminal from the connection terminal and arranged at a non-contact position of the connection terminal.
In a state where the welded terminal is deformed and the welded terminal is arranged at a non-contact position of the connecting terminal and the lead wire is not connected to the movable contact plate , the movable contact and the fixed contact are energized and ultrasonically vibrated to make a contact. A method for manufacturing a microbreaker, which comprises ultrasonically activating the contact and then ultrasonically activating the contact point, wherein the welding terminal is connected to the connection terminal.

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