WO2022054419A1

WO2022054419A1 - Heater chip and heater chip unit

Info

Publication number: WO2022054419A1
Application number: PCT/JP2021/027194
Authority: WO
Inventors: 伸一郎須賀
Original assignee: 株式会社アポロ技研
Priority date: 2020-09-09
Filing date: 2021-07-20
Publication date: 2022-03-17
Also published as: KR20220126795A; MY196750A; CN115443202A; JP2022045442A; JP7137235B2; TW202211743A

Abstract

This heater chip and this heater chip unit can easily achieve good heating efficiency regardless of increases or decreases in plate thickness.　The heater chip is a plate-shaped heater chip 2 for thermal press fitting of a terminal lead to a terminal member, and comprises: a soldering iron section 6 provided with a soldering iron tip section 13 that comes into contact with the terminal lead in a state of protruding downward from a soldering iron body 11; and connecting arm sections 7 that extend upward from lateral end sections of the soldering iron body 11 and raise the temperature of the soldering iron section 6 by causing a current from a power source to flow to the soldering iron body 11. The soldering iron body 11 has: a plate thickness that is set to be less than that of the connecting arm sections 7; and a cross-sectional area that is set to be less than that of the connecting arm sections 7.

Description

Heater tip and heater tip unit

The present invention relates to a heater tip for thermocompression bonding a terminal lead wire to a terminal member, and a heater tip unit.

For thermocompression bonding of terminal conductors to terminal members, for example, in the work of thermocompression bonding lead wires to core terminals in the manufacture of electronic components such as chip inductors, heat is generated by electrical resistance when energized. A heater chip is used. Specifically, the terminal lead wire mounted on the terminal member is rapidly heated while being pressurized by the iron tip of the heater chip for thermal crimping, and the terminal lead wire is thermally crimped to the terminal member (see, for example, Patent Document 1). ).

Japanese Unexamined Patent Publication No. 2001-284781

By the way, the heater chip is manufactured by cutting out from a conductive plate material such as tungsten or molybdenum by wire electric discharge machining. Then, in order to make the iron tip portion a size suitable for the work size (the size of the terminal member and the size of the terminal lead wire), the plate thickness of the plate material is changed.

However, if the plate thickness of the plate material (in other words, the plate thickness of the entire heater chip) is changed, the current density at the time of energization changes along with the cross-sectional area in the heat generating portion of the heater chip, and the desired heat generation performance (temperature rise / temperature rise). Cooling responsiveness, power consumption, etc.) cannot be obtained. In particular, if the plate thickness is increased in order to cope with the increase in work size, the current density becomes smaller and it becomes difficult to generate heat. It increases and the heat generation efficiency deteriorates. Further, since the heat capacity increases due to the increase in the volume of the heat generating portion, it is difficult to perform rapid cooling.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heater chip and a heater chip unit that can easily realize good heat generation efficiency regardless of an increase or decrease in plate thickness. be.

The present invention has been proposed to achieve the above object, and the one according to claim 1 is a plate-shaped heater chip for thermocompression bonding a terminal lead wire to a terminal member.
A trowel portion having a trowel tip portion that abuts on the terminal lead wire protruding downward (pressurizing direction at the time of crimping) from the trowel body, and a trowel portion.
It is provided with a connecting arm portion extending upward from the left and right ends of the iron body and allowing a current from a power source to flow through the iron body to raise the temperature of the iron body.
The iron body is a heater tip characterized in that the plate thickness is thinner than the plate thickness of the connecting arm portion and the cross-sectional area is set to be smaller than the cross-sectional area of the connecting arm portion.

The second aspect of the present invention is thinned by extending a gouged portion in a range extending from the lower part of the connecting arm portion to the iron body along a direction from one connecting arm portion to the other connecting arm portion. The heater chip according to claim 1, wherein the portion is formed and the surface of the thin-walled portion that becomes the bottom of the hollow portion is the surface of the iron body.

The heater chip according to claim 3 is the heater chip according to claim 2, wherein the iron tip portion is projected below the thin-walled portion.

According to claim 4, the thin-walled portion is formed on the connecting arm portion side of the iron tip portion, and the thickness of the side surface of the iron body is formed to be thinner than the thickness of the connecting arm portion excluding the thin-walled portion. The heater chip according to claim 2, wherein the heater chip is made.

The fifth aspect of the present invention is characterized in that the thin-walled portion is formed at a position separated from the iron tip portion, and the plate thickness of the iron tip portion is set to be the same as the plate thickness of the connecting arm portion. The heater chip according to any one of claims 2 to 4.

The invention according to claim 6 is characterized in that the thin-walled portion is formed at a position separated from the iron tip portion, and the plate thickness of the iron tip portion is set to be thinner than the plate thickness of the connecting arm portion. The heater chip according to any one of claims 2 to 4.

The item according to claim 7 is any one of claims 1 to 6, wherein the center of each of the connecting arm portion, the iron body, and the iron tip portion in the thickness direction is located on the same plane. The heater chip described.

The heater chip according to claim 8 is the heater chip according to any one of claims 1 to 7, wherein an oxidation-resistant coating layer is formed at least on the surface of the iron portion.

The heater chip according to claim 9, wherein the oxidation-resistant coating layer is a nickel coating.

The heater chip unit according to claim 10 is characterized in that a temperature sensor is attached to the iron portion of the heater chip according to any one of claims 1 to 9.
The heater chip unit according to claim 11 is the heater chip unit according to claim 10.
The heater chip is
A trowel portion having the trowel tip portion in contact with the terminal lead wire in the trowel body, and a trowel portion.
A pair of connecting arms extending upward from the left and right ends of the iron body so as to be separated from each other and allowing a current from a power source to flow through the iron body to raise the temperature of the iron body.
A temperature measuring stop portion provided on the iron portion and to which the temperature measuring portion of the temperature sensor is fastened is provided.
The temperature measuring stop portion is provided with a pair of stop contact surfaces that the temperature measurement section contacts, and is set to a state in which the separation distance between the stop contact surfaces gradually expands from the iron portion side to the upper side. It is a characteristic heater chip unit.

According to the present invention, the following excellent effects are obtained.
According to the first aspect of the present invention, the iron body is set to have a plate thickness thinner than the plate thickness of the connecting arm portion and a cross-sectional area smaller than the cross-sectional area of the connecting arm portion. Even if the plate thickness of the chip is increased, it is possible to suppress the inconvenience that the current density in the iron body decreases and the heat generation becomes insufficient. Therefore, it is easy to realize good heat generation efficiency regardless of the increase or decrease in the plate thickness of the heater tip.

According to the second aspect of the present invention, in the range from the lower part of the connecting arm portion to the iron body, the gouged portion extends along the direction from one connecting arm portion to the other connecting arm portion. Since the surface of the thin-walled part that becomes the bottom of the gouged part is the surface of the iron body, the structure of the heater chip whose plate thickness of the iron body is thinner than the plate thickness of the connecting arm part is easily realized. be able to.

According to the third aspect of the present invention, since the iron tip portion is projected below the thin-walled portion, when foreign matter adheres to the iron tip portion by the thermocompression bonding operation, the tip of the iron tip portion is pressed. It is easy to remove foreign matter by polishing. In addition, a sufficient polishing allowance for the tip of the iron tip can be secured.

According to the fourth aspect of the present invention, the thin-walled portion is formed on the connecting arm portion side with respect to the iron tip portion, and the thickness of the side surface of the iron body is larger than the thickness of the connecting arm portion excluding the thin-walled portion. Since it is formed thin, it is possible to sufficiently secure the dimensions in the plate thickness direction on the tip surface of the iron tip portion. This makes it possible to widen the allowable range of the size of the work (thermocompression bonding target) to which the heater tip can be thermocompression bonded.

According to the fifth aspect of the present invention, the thin-walled portion is formed at a position separated from the iron tip portion, and the plate thickness of the iron tip portion is set to be the same as the plate thickness of the connecting arm portion. It is not necessary to increase or decrease the plate thickness of the portion with respect to the plate thickness of the connecting arm portion, and it is easy to manufacture a heater tip.

According to the invention of claim 6, the thin-walled portion is formed at a position separated from the iron tip portion, and the plate thickness of the iron tip portion is set to be thinner than the plate thickness of the connecting arm portion. The degree of freedom in the thickness of the part can be increased, and it is easy to design a heater tip that corresponds to the size of the work.

According to the invention of claim 7, since the centers of the connecting arm portion, the iron body, and the iron tip portion in the thickness direction are located on the same plane, a bending moment is generated in the heater tip during the thermocompression bonding operation. It becomes difficult to do so, and it is possible to suppress the inconvenience that an extra load is applied to the heater chip, and eventually the inconvenience that the heater chip is easily damaged.

According to the inventions of claim 8 and 9, oxidation of the surface of the heater chip can be suppressed even if the temperature is raised and cooled repeatedly, and the durability can be improved.

According to the tenth aspect of the present invention, since the temperature sensor is attached to the iron portion of the heater chip, it is possible to acquire the temperature information of the iron portion and utilize it for controlling the heat generation of the heater chip.
According to the invention of claim 11, since the temperature measuring anchoring portion is set to a state in which the separation distance between the anchoring contact surfaces gradually expands from the iron portion side toward the upper side, the temperature sensor is measured. It is possible to form a heater chip unit capable of sufficiently contacting the temperature portion with the temperature measuring stop portion, and having good adhesion to the heater chip of the temperature measuring portion, and by extension, good temperature measurement.

It is a perspective view of a heater chip unit. It is explanatory drawing of a heater chip, (a) is a plan view, (b) is a front view, (c) is a bottom view, (d) is a side view. It is explanatory drawing of the temperature measuring stop part of a heater chip, (a) is a front view, (b) is a sectional view. It is explanatory drawing of the procedure of attaching a thermocouple to a heater chip, (a) is a state before inserting a thermocouple into a heater chip, (b) is a state after inserting a thermocouple into a heater chip, (c). ) Is a state in which resin is injected into the lead wire storage vacant part and the stop recess as the lead wire stop portion. It is a perspective view of the heater chip provided with two iron portions. It is explanatory drawing of the heater chip provided with two iron portions, (a) is a plan view, (b) is a front view, (c) is a bottom view, (d) is a side view.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the heater chip unit 1 includes a plate-shaped heater chip 2 for thermocompression bonding the terminal lead wire A to the terminal member B (see FIG. 2D), and a heater as a temperature sensor. It is configured to include a thermocouple 3 attached to the chip 2. The heater chip 2 is a chip formed by processing a plate material of a conductive material (tungsten, molybdenum, cemented carbide, etc.) by wire electric discharge machining, and as shown in FIG. 2, the lower portion (work) of the heater chip 2 is formed. It is configured to include a trowel portion 6 (a tip portion located on the terminal lead wire A and a terminal member B) side) and a pair of left and right connecting arm portions 7 as an upper portion (base portion). Then, when the iron portion 6 is energized via the connecting arm portion 7, the iron portion 6 can generate heat by electric resistance, and the temperature of the iron portion 6 can be measured by the thermocouple 3.

The iron portion 6 includes a horizontally long iron main body 11 that connects the lower portions of the connecting arm portions 7, and the width of the iron main body 11 (dimensions along the lateral direction in which the pair of connecting arm portions 7 are lined up) is set to the heater tip 2. It is set to gradually narrow toward the bottom. Further, a box-shaped iron tip portion 13 is projected downward from the bottom of the iron body 11 slightly protruding downward, and the bottom surface (tip surface) of the iron tip portion 13 is used as the iron tip surface 13a for terminals. It is possible to contact the conductor A. Further, a substantially rectangular iron recess 15 is formed in the upper portion (connecting arm 7 side) of the iron body 11 opposite to the iron tip 13, and the temperature measuring contact of the thermocouple 3 is formed in the iron recess 15. (Temperature measuring unit) 3a is fixed. The configuration in which the temperature measuring contact 3a is fixed will be described in detail later.

The connecting arm portion 7 is a vertically long structural portion extending upward from the left and right ends of the iron body 11, and is provided with the connecting arm portions 7 separated from each other. Further, in the upper portion (extended end portion) of the connecting arm portion 7, a mounting hole 17 for mounting on the chip holder (not shown) of the thermocompression bonding device is penetrated in the plate thickness direction of the heater chip 2 and this mounting is performed. By screwing a mounting bolt (not shown) passed through the hole 17 into the tip holder, the heater tip unit 1 is mounted on the tip holder with the iron tip portion 13 facing downward.

In the heater chip unit 1 mounted on the chip holder, one connecting arm 7 is electrically connected to one end of the heater power supply (not shown) of the thermocompression bonding device, and the other connecting arm 7 is connected. It is electrically connected to the other end of the heater power supply. Then, when a current is passed from the power supply (power supply for the heater) to the heater tip 2, the current flows into the iron body 11 via the connecting arm portion 7, and the iron body 11 generates heat due to the electric resistance in the iron body 11, and this The iron tip portion 13 is configured to raise the temperature by heat. Further, the current in the iron body 11 flows from one connecting arm portion 7 side to the other connecting arm portion 7 side, but in the path through which the current flows, the constricted portion located at the corner portion of the iron recess 15 is cut off. Since the area is smaller than the cross-sectional area of other parts, the current density is highest at this constricted part, and Joule heat due to electric resistance is likely to be generated around this part.

Further, as shown in FIGS. 1 and 2 (d), the heater chip 2 is provided in the left-right direction (one connecting arm) in a range extending from the lower portion of the connecting arm portion 7 to the iron body 11 on both the front and back surfaces of the heater chip 2. Grooves 20 are extended as gouged portions in the present invention along the direction from the portion 7 to the other connecting arm portion 7, and the extending grooves 20 on the front and back sides form a thin-walled portion 21 to form a trowel tip portion. 13 is configured to project below the thin wall portion 21. In other words, the thin-walled portion 21 is configured to be formed at a position away from the iron tip portion 13 (specifically, on the connecting arm portion 7 side of the iron tip portion 13).

Further, as shown in FIG. 2D, the depth dimension of the groove 20 on the front and back (dimension in the plate thickness direction of the heater chip 2) is set to be the same, and the connecting arm portion 7 and the iron body 11 (thin wall portion 21) are set to be the same. ), The center of each thickness direction of the iron tip portion 13 is configured to be located on the same plane, and the plate thickness of the iron tip portion 13 is set to be the same as the plate thickness of the connecting arm portion 7. Further, the surface of the thin wall portion 21 which is the bottom of the groove 20 is the side surface (front and back surface) of the iron body 11, and the plate thickness of the iron body 11 (plate thickness of the thin wall portion 21) is thinner than the plate thickness of the connecting arm portion 7. Moreover, the cross-sectional area of the iron body 11 (in other words, the cross-sectional area as a flow path through which a current flows) is set to be smaller than the cross-sectional area of the connecting arm portion 7. Then, the thickness t1 of the side surface of the iron body 11 is the thickness of the connecting arm portion 7 (specifically, the thickness of the connecting arm portion 7 excluding the thin-walled portion 21 (the portion of the connecting arm portion 7 that is separated from the thin-walled portion 21). (Thickness)) It is formed thinner than t2 (see FIGS. 1 and 2 (d)).

Next, the thermocouple 3 attached to the heater chip 2 and the configuration on the heater chip 2 for attaching the thermocouple 3 will be described.
As shown in FIGS. 1 and 3, the thermocouple 3 is a element having electrical insulation property by welding the tips of two types of strands 25 to each other to form a spherical temperature measuring contact (temperature measuring portion) 3a. Each of the strands 25 is covered with the wire covering material 26, and further bundled into one by the covering of the outer covering material 27 to form the conducting wire 3b. In other words, the conductor wire 3b includes the strand 25. Further, the diameter of the temperature measuring contact 3a and the diameter of the conducting wire 3b are set smaller than the plate thickness of the heater chip 2, respectively.

Further, in the heater chip 2, the storage portion of the conducting wire 3b is provided in the gap between the connecting arm portions 7, and the fastening portion of the temperature measuring contact 3a is provided in the iron portion 6. Specifically, as shown in FIGS. 1 and 2 (a) and 2 (b), the upper end portion opens a gap between the connecting arm portions 7 extending along the longitudinal direction of the connecting arm portions 7. The conductor storage space 30 is set to a size (thickness, width) slightly larger than the wire diameter of the conductor 3b, and the conductor 3b (specifically, the temperature measuring contact 3a of the conductor 3b is closer to the temperature measuring contact 3a) in the conductor storage space 30. The portion located in) is stored in a state where the conductor 3b does not protrude outward from each of the front and back surfaces of the heater chip 2. Then, the conductor 3b extends from the opening 30a at the upper end of the conductor storage vacant portion 30, and the lower end of the conductor storage vacant portion 30 is widened to communicate with the iron recess 15 (see FIG. 1).

Further, each connecting arm portion 7 is formed with a part of the side surface facing the conductor storage vacant portion 30 cut out so as to communicate with the conductor storage vacant portion 30, and each stop recess 31 and the conductor storage vacant portion 30 are formed. A part of the vacant portion 30 (a portion located between the fixing recesses 31) is provided with a conducting wire fixing portion 32 which is cured (solidified) after injecting a resin such as an ultraviolet curable resin or a thermosetting resin. The conductor 32 prevents the conductor 3b from shifting from the conductor accommodating empty portion 30 and protruding from the heater chip 2.

Further, in the iron recess 15 formed in the iron portion 6, the temperature measuring contact 3a of the thermocouple 3 is fastened to the portion facing the end (lower end) of the conducting wire accommodating empty portion 30. The 35 is provided in a state of protruding toward the upper connecting arm portion 7. As shown in FIG. 3, the temperature measuring fastening portion 35 is a protrusion portion that protrudes from the iron tip portion 13 on the opposite side of the iron body 11 and is formed to be slightly smaller than the iron tip portion 13. There is. Further, the portion facing the conductor storage vacant portion 30 (the upper portion of the temperature measuring vacant portion 35) is provided with a pair of fastening contact surfaces 35a to which the temperature measuring contact 3a contacts, and the end of the conducting wire accommodating vacant portion 30. It is set to face the portion and gradually expands as the separation distance between the fastening contact surfaces 35a increases from the iron portion 6 side toward the upper conductor storage vacant portion 30 side. Then, by forming each of the fastening contact surfaces 35a on a flat surface, a V-shaped recess 36 is formed in the upper portion of the temperature measuring fastening portion 35 (the upper portion on the side of the lead wire storage vacant portion 30), and the inside of the recess 36 is formed. The temperature measuring contact 3a is received and brought into contact with the fastening contact surface 35a, and the temperature measuring contact 3a is fastened to the iron portion 6 (temperature measuring fastening portion 35) by welding or the like in this state.

Next, a procedure for manufacturing the heater chip unit 1, particularly a procedure for attaching the thermocouple 3 to the heater chip 2 will be described.
First, as shown in FIG. 4A, the heater chip 2 and the thermocouple 3 separately prepared in advance are arranged so that the opening 30a of the conductor storage space 30 and the temperature measuring contact 3a face each other. The attitudes of the heater chip 2 and the thermocouple 3 are set, and the temperature measuring stop 35, the lead wire storage empty section 30, the temperature measuring contact 3a, and the conducting wire 3b are arranged in this order on the same straight line. After setting the postures of the heater chip 2 and the thermocouple 3, the thermocouple 3 is inserted into the opening 30a of the lead wire storage space 30 of the heater chip 2 with the temperature measuring contact 3a at the head. Then, the side surface of the connecting arm portion 7 serves as a guide to guide the thermocouple 3 to the iron portion 6 side.

Further, when the thermocouple 3 is deeply inserted, as shown in FIG. 4 (b), the temperature measuring contact 3a enters the iron recess 15 after passing through the conductor accommodating empty portion 30. Here, as shown in FIG. 3A, the iron portion 6 is provided with a temperature measuring fastening portion 35 at a position facing the lower end portion (open end portion on the iron portion 6 side) of the conductor storage empty portion 30. Since the V-shaped fastening contact surface 35a faces the end of the conductor accommodating empty portion 30, the temperature measuring contact 3a that has entered the iron recess 15 reaches the temperature measuring fastening portion 35 and makes a fastening contact. Contact (contact) with the surface 35a. In this way, the temperature measuring contact 3a can be easily and surely brought into contact with the fastening contact surface 35a (temperature measuring fastening portion 35). Therefore, it is possible to smoothly prepare for anchoring the temperature measuring contact 3a to the temperature measuring anchoring portion 35.

Then, the lead wire 3b is pressed toward the temperature measuring anchoring portion 35 to maintain the contact of the temperature measuring anchoring portion 35 with the fastening contact surface 35a, and in this state, the temperature measuring anchoring portion 35 and the fastening contact surface 35a are maintained. Is fixed (welded) by laser welding. Specifically, the fastening contact surface 35a is heated by irradiating it with a laser, and the temperature measuring contact 3a is melted by this heat to be fastened (welded). At this time, as shown in FIG. 3A, the temperature measuring anchoring portion 35 is set to a state in which the separation distance between the anchoring contact surfaces 35a gradually expands from the iron portion 6 side toward the upper side. , The temperature measuring contact 3a can be sufficiently brought into contact with the temperature measuring anchoring portion 35. Therefore, it is possible to configure the heater chip unit 1 capable of good adhesion of the temperature measuring contact 3a to the heater chip 2 and thus good temperature measurement. Further, since the fastening contact surface 35a is formed of a flat surface and the temperature measuring contact 3a is formed of a spherical body, the temperature measuring contact 3a can easily make point contact with the fastening contact surface 35a. Further, by pressing the temperature measuring contact 3a against the fastening contact surface 35a, stress is easily concentrated and the temperature measuring contact 3a is difficult to float from the fastening contact surface 35a. As a result, the temperature measuring contact 3a can be more satisfactorily attached to the heater chip 2, and thus the temperature of the heater chip 2 can be measured more satisfactorily.

When the temperature measuring contact 3a is fastened to the temperature measuring fastening portion 35, as shown in FIG. 4C, a part of the lead wire storage empty portion 30 (a portion located between the stopping recesses 31) and each stop. A resin such as an ultraviolet curable resin or a thermosetting resin is injected into the concave portion 31 in a state before curing (flow state) to fill the recesses, and then a resin curing treatment such as ultraviolet irradiation or heating is performed to cure the resin and stop the wire. It is referred to as a part 32.

In the heater chip unit 1 configured by attaching the thermocouple 3 to the heater chip 2 in this way, since the lead wire 3b of the thermocouple 3 is housed in the lead wire storage empty portion 30, the lead wire 3b of the thermocouple 3 is the heater chip. It is possible to avoid protruding from the range of the plate thickness of 2. Therefore, when handling the heater chip unit 1 such as mounting work on a thermocompression bonding device, or when entering the work area of the heater chip unit 1, the inconvenience of inadvertently hooking the conductor 3b, and eventually the thermocouple from the heater chip 2. It is unlikely that the inconvenience of 3 falling off will occur. Further, when a plurality of heater chip units 1 are to be put together at the time of transportation (shipment) or storage, the heater chip units 1 can be stably stacked without any trouble, and the transportation work and the storage work can be performed without delay. be able to.

Further, since the conductor storage vacant portion 30 is provided with the conductor stopper portion 32, it is possible to prevent the inconvenience that the stored conductor wire 3b comes off from the conductor storage vacant portion 30. Further, since the resin injected into the conductor storage space 30 and cured is used as the conductor stopper 32, it is easy to insert the resin into the gap between the connecting arm 7 and the conductor 3b as the conductor stopper 32, and the conductor 3b is sufficiently inserted. Can be stopped at. Further, since the conductor retaining portion 31 is provided with the retaining recess 31 communicating with the conducting wire accommodating vacant portion 30, and the resin which is the conducting wire retaining portion 32 is injected into the conducting wire accommodating vacant portion 30 and the retaining recess 31 to be cured, the conducting wire retaining portion 32 accommodates the conducting wire. It becomes difficult to fall off from the vacant portion 30, and it is possible to suppress the inconvenience that the conductor 3b is detached from the conductor storage vacant portion 30 together with the conductor stop portion 32.

Then, in the work of thermocompression-bonding the terminal lead wire A to the terminal member B using the heater chip unit 1, first, the heater chip unit 1 is placed on the chip holder of the thermocompression-bonding device with the iron tip portion 13 on the lower side. Attached, the lead wire 3b of the thermocouple 3 is connected to the thermocouple connection terminal (not shown) of the thermocompression bonding device. After that, the terminal member B and the terminal lead wire A are set in a work area (none of which is shown) provided below the chip holder, and the terminal lead wire A is placed on the upper surface of the terminal member B. When the terminal member B and the terminal lead wire A are set, the heater tip unit 1 is lowered together with the tip holder to press the iron tip portion 13 against the terminal lead wire A, and further, the iron main body is energized by energizing the heater tip 2. 11 is heated, and the terminal lead wire A is thermocompression bonded to the terminal member B. Further, the temperature of the iron portion 6 is measured by the thermocouple 3, and the control unit (not shown) of the thermocompression bonding device controls the energization of the heater chip 2 based on this measured value, and further controls the temperature of the iron tip portion 13. I do.

Here, in the heater chip 2 that generates heat, the plate thickness of the iron body 11 is set to be thinner than the plate thickness of the connecting arm portion 7, and the cross-sectional area of the iron body 11 is set to be smaller than the cross-sectional area of the connecting arm portion 7. Therefore, even if the plate thickness of the heater chip 2 is increased, the inconvenience that the current density in the iron body 11 decreases and the heat generation becomes insufficient can be suppressed. Therefore, it is easy to realize good heat generation efficiency regardless of the increase or decrease in the plate thickness of the heater tip 2. Further, it is possible to avoid an increase in the volume of the iron body 11 and an increase in the heat capacity, and it is easy to quickly cool the iron body 11 and the iron tip portion 13. Further, since the groove 20 extends from the lower part of the connecting arm portion 7 to the iron body 11 to form the thin-walled portion 21, the surface of the thin-walled portion 21 which is the bottom of the groove 20 is the side surface of the iron body 11. , The structure of the heater tip 2 in which the plate thickness of the iron body 11 is thinner than the plate thickness of the connecting arm portion 7 can be easily realized.

Further, since the iron tip portion 13 is projected below the thin-walled portion 21, if foreign matter (insulation coating of the terminal lead wire A, etc.) adheres to the iron tip portion 13 due to thermocompression bonding work, the iron tip portion 13 It is easy to remove foreign matter by polishing the tip. Further, it is possible to sufficiently secure a polishing allowance for the tip of the iron tip portion 13, and it is possible to prolong the replacement cycle (use life) of the heater tip unit. Then, the thin-walled portion 21 was formed on the connecting arm portion 7 side of the iron tip portion 13, and the thickness of the side surface of the iron body 11 was formed to be thinner than the thickness of the connecting arm portion 7 excluding the thin-walled portion 21. While suppressing the decrease in the current density in the iron body 11, it is possible to sufficiently secure the dimensions in the plate thickness direction on the tip surface of the iron tip portion 13. This makes it possible to widen the allowable range of the size of the work (target for thermal crimping) on which the heater chip 2 can be thermally crimped. Further, since the thin-walled portion 21 is formed at a position separated from the iron tip portion 13 and the plate thickness of the iron tip portion 13 is set to be the same as the plate thickness of the connecting arm portion 7, the plate thickness of the iron tip portion 13 is set to the connecting arm. It is not necessary to increase or decrease the thickness with respect to the plate thickness of the portion 7, and the heater tip 2 can be easily manufactured.

Further, since the centers of the connecting arm portion 7, the iron body 11, and the iron tip portion 13 in the thickness direction are located on the same plane, it is difficult for a bending moment to be generated in the heater tip 2 during thermocompression bonding work, and the heater tip is not easily generated. It is possible to suppress the inconvenience that an extra load is applied to 2 and the inconvenience that the heater tip 2 is easily damaged. Since the thermocouple 3 is attached to the iron portion 6 of the heater chip 2 as a temperature sensor, it is possible to acquire the temperature information of the iron portion 6 and utilize it for controlling the heat generation of the heater chip 2. In addition, the temperature sensor can be realized with a simple configuration.

By the way, in the above embodiment, the iron body 11 is configured by extending the grooves 20 on both the front and back surfaces of the heater chip 2 to form the thin-walled portion 21, but the present invention is not limited to this. In short, if the plate thickness of the iron body 11 is thinner than the plate thickness of the connecting arm portion 7 and the cross-sectional area of the iron body 11 is set to be smaller than the cross-sectional area of the connecting arm portion 7, any mode of iron is used. The main body 11 may be provided on the heater chip 2. For example, the iron body 11 may be formed by extending the groove on either the front surface or the back surface of the heater tip 2 to form the thin-walled portion 21. However, the iron main body 11 is located unevenly on either the front or the back of the heater tip 2, which causes a bending moment in the heater tip 2 during thermocompression bonding work. Therefore, the connecting arm portion 7 and the iron main body 11. It is preferable to adopt a configuration in which the center of each thickness direction of the iron tip portion 13 is located on the same plane, that is, the configuration of the above embodiment. The iron body 11 may be configured to include a portion having the highest electric resistance value (a portion serving as a heat generating portion). Therefore, the region for thinning by the groove or the like may extend to the inside of the connecting arm portion 7, and may not necessarily be the entire area of the iron body 11.

Further, the plate thickness of the iron tip portion 13 and the plate thickness of the connecting arm portion 7 are set to the same dimensions, but the present invention is not limited to this. For example, if the plate thickness of the iron tip portion 13 is cut to be thinner than the plate thickness of the connecting arm portion 7, the degree of freedom in the plate thickness dimension of the iron tip portion 13 can be increased, and the work to be subjected to thermocompression bonding treatment ( It is easy to design the heater chip 2 corresponding to the size of the terminal member B and the terminal lead wire A). Further, as shown in FIG. 3, the temperature measuring fastening portion 35 is configured to be slightly smaller than the iron tip portion 13, but the present invention is not limited to this. For example, the volume of the iron tip portion 13 and the volume of the temperature measuring anchoring portion 35 are aligned so as to avoid an extremely different difference between the heat capacity of the iron tip portion 13 and the heat capacity of the temperature measuring anchoring portion 35. Then, it is possible to synchronize the temperature change in the temperature measuring stop 35 with the temperature change in the iron tip 13, and the iron tip 13 is based on the temperature measurement of the temperature measuring stop 35. Easy to carry out temperature control.

Further, the fastening contact surface 35a of the temperature measuring fastening portion 35 is configured by a flat surface, but the present invention is not limited to this. In short, the fastening contact surface 35a may be formed of a curved surface as long as the separation distance between the fastening contact surfaces 35a is set to gradually expand from the iron portion 6 side toward the upper side. If the temperature measuring contact (temperature measuring unit) 3a can be sufficiently contacted with the fastening contact surface 35a, the temperature measuring contact 3a is not limited to being formed into a spherical shape, and is formed in any shape. You may. Further, the temperature measuring contact 3a of the thermocouple 3 and the temperature measuring fastening portion 35 are welded and fastened, but the present invention is not limited to this. In short, as long as the temperature of the iron portion 6 can be measured, the fastening mode between the temperature measuring contact 3a and the temperature measuring fastening portion 35 does not matter. For example, the temperature measuring contact 3a and the temperature measuring fastening portion 35 may be fastened using a fastener (adhesive) having good heat conduction.

Further, in the heater chip 2 of the above embodiment, the conductor storage empty portion 30 is provided so as to extend linearly along the longitudinal direction of the connecting arm portion 7, but the present invention is not limited to this. In short, any form of the conductor storage vacant portion 30 may be applied as long as the configuration is such that the conductor 3b of the thermocouple 3 can be stored. For example, a conductor storage vacant portion 30 extending in a curved line shape or a curved line shape may be applied. Further, although a resin such as an ultraviolet curable resin or a thermosetting resin is exemplified as the lead wire stopper 32 in the present invention, the present invention is not limited to this. In short, as long as the conductor 3b stored in the conductor storage vacant portion 30 can be stopped to prevent the conductor from falling out of the conductor storage vacant portion 30, the mode of the conductor stop portion 32 does not matter. For example, a cap that can be fitted to the conductor storage vacant portion 30 may be adopted as the conductor stopper, or a protrusion that is integrally molded with the connecting arm portion 7 and protrudes toward the conductor storage vacant portion 30 may be used as the conductor stopper. May be adopted as.

Further, the retaining recess 31 communicating with the conductor storage vacant portion 30 is configured by a shallow notch on the side surface of the conductor storage vacant portion 30, but the present invention is not limited to this. In short, as long as the resin which is the conductor fixing portion 32 is injected from the conducting wire accommodating empty portion 30 over the fixing recess 31 and can be cured, any embodiment of the configuration of the fixing recess 31 may be adopted. For example, groove-shaped retaining recesses are formed on both the front and back surfaces of the connecting arm portion 7, and the end portion of the retaining recess is communicated with the conducting wire storage empty portion 30 so that the resin (conductor retaining portion 32) is transmitted from the conducting wire storage empty portion 30. It may be configured to be injected over the retaining recess.

Further, in the above embodiment, the thermocouple 3 is exemplified as the temperature sensor of the present invention, and the temperature measuring contact 3a of the thermocouple 3 is exemplified as the temperature measuring unit of the present invention, but the present invention is not limited thereto. In short, if the temperature sensor is capable of measuring the temperature of the iron portion 6 and is configured to have the temperature measuring portion at the end of the conducting wire 3b, any form of the temperature sensor is adopted for the heater tip 2. It may be attached.

By the way, in the above embodiment, the groove 20 is exemplified as the gouged portion in the present invention, but the present invention is not limited to this. The point is, if a thin-walled part is formed on the heater tip by extending the gouged part along the direction from one connecting arm part to the other connecting arm part, what kind of mode should the gouged part be set? May be good. For example, the heater chip 2'of the second embodiment shown in FIGS. 5 and 6 is basically the same as the above embodiment (first embodiment), but only on both the front and back sides of the heater chip 2'. The difference is that the lower half of the heater tip 2'is bifurcated by forming a gouge in the middle part of the heater tip 2'in the plate thickness direction, which has two iron bodies. ..

Specifically, the heater chip 2'is located in the middle portion in the plate thickness direction of the iron portion 6'located below the heater chip 2'in the left-right direction (from one connecting arm 7 to the other connecting arm). The iron space portion 40 extending along the portion 7) is formed as a hollow portion, and the iron space portion 40 is opened downward. The iron main body 11 and the iron tip portion 13 are provided on both the front and back sides of the heater tip 2'with the iron space portion 40 interposed therebetween. In other words, the iron portion 6'of the heater tip 2'includes two iron main bodies 11 that are separated from each other and two iron tip portions 13 that are separated from each other. Further, each iron body 11 is provided with a trowel recess 15 in which a groove 20 is formed on the outer surface, a groove 20'is also formed on the inner surface, and the temperature measuring fixing portion 35 is projected. , The temperature measuring contact (temperature measuring part) 3a of the thermocouple 3 can be fixed to each temperature measuring fixing part 35, and in each iron tip part 13, the plate thickness of the iron tip part 13 is connected to the connecting arm part 7. It is set thinner than the plate thickness.

If the heater tip 2'provided with such a trowel portion 6'is configured, the two trowel tip portions 13 can simultaneously perform thermocompression bonding at two locations, thereby improving the efficiency of the thermocompression bonding work. can. Further, by setting the dimensions of the iron space portion 40 in the plate thickness direction, the separation distance (pitch) between the two iron tip portions 13 and the size of the iron tip surface 13a of each iron tip portion 13 can be adjusted according to the work. Can be done.

Further, in the above-described embodiment, an oxidation-resistant coating layer may be formed on the surface of the heater chip to enhance the oxidation resistance.

Hereinafter, the oxidation resistant coating layer will be described.
In the heater chip, since the temperature is raised and cooled repeatedly every time thermocompression bonding is performed, the surface is easily oxidized, and the oxidation is particularly remarkable in the vicinity of the iron portion 6 (heating portion) and the portion where the thermocouple 3 is welded. .. For this reason, the oxidized part near the heat generating part is peeled off and the strength is lowered, which causes a problem of damage during pressurization. In addition, the welded part of the thermocouple is corroded and the strength is lowered, and finally the thermoelectric is generated. Inconveniences such as the pair being separated and unable to be used occur.

Therefore, in the present embodiment, an oxidation-resistant coating layer is formed on the surface of the heater chip to improve the oxidation resistance. Hereinafter, the manufacturing process will be specifically described.
First, regarding the metal plate used as the material (base material), specifically, it is superior in abrasion resistance to the conventionally generally used tungsten (hardness HV430) and tungsten alloy (hardness HV200-400). It is desirable to use so-called cemented carbide (hardness HV900-2400) (official name; cemented carbide, alloy obtained by sintering hard metal carbide powder), and this cemented carbide plate is made into a predetermined shape by wire cutting. break the ice. Next, the cut pieces are subjected to pre-plating treatment, and then immersed in a melting tank and energized to form an oxidation-resistant coating layer made of nickel on the surface of the cut pieces, that is, nickel plating is performed. After that, it is withdrawn from the melting tank and subjected to post-treatment such as washing.
Then, in the same manner as in the above-described embodiment, the temperature measuring contact 3a of the thermocouple 3 is laser-welded to the temperature measuring fastening portion 35. In this welding, since the coating of the nickel layer is formed on the surface of the temperature measurement fixing portion 35 (the fixing contact surface 35a), the wettability is enhanced, thereby improving the certainty of welding and the welding strength. Further, when the wettability at the time of welding is enhanced, the output of the laser can be suppressed more than before, and the damage to the base metal can be suppressed, so that the quality can be improved and the energy consumption can be saved.
When the welding of the thermocouple 3 is completed, further plating pretreatment is performed, the heater chip unit 1 equipped with the thermocouple 3 is immersed in the electrolytic solution, and the entire surface including the temperature measuring contact 3a of the thermocouple 3 is covered. Apply nickel plating.

When the heater chip unit 1 manufactured in this manner is used, the oxidation resistance is improved, so that it is possible to suppress peeling and strength decrease due to oxidation of the iron portion 6 and the attachment portion of the thermocouple 3. Durability can be improved. In particular, when nickel plating is applied to the base material using a cemented carbide, the wettability is improved, the weldability can be improved, and the durability can be surely improved. Since the main component of the thermocouple is nickel, nickel plating has a good affinity. Further, the oxidation resistant film is not limited to nickel plating, and may be, for example, gold plating.

And, it should be considered that the above-described embodiment is exemplary in all respects and is not restrictive. The present invention is not limited to the above description, but is shown by the scope of claims, and includes all modifications within the meaning and scope equivalent to the scope of claims.

1 Heater chip unit 2,2'Heater chip 3 Thermocouple 3a Temperature measuring contact 3b Conductor 6,6' Iron part 7 Connection arm 11 Iron body 13 Iron tip 13a Iron tip surface 15 Iron recess 17 Mounting holes 20, 20' Groove 21 Thin-walled part 25 Wire 26 Wire covering material 27 Outer covering material 30 Conducting wire storage vacant part 30a Opening port 31 Stopping recess 32 Conducting wire stopping part 35 Temperature measuring fixing part 35a Stopping contact surface 36 Indentation 40 Iron space part

Claims

A plate-shaped heater chip for thermocompression bonding terminal conductors to terminal members.
A trowel portion having a trowel tip portion that abuts on the terminal lead wire in a state of protruding downward from the trowel body, and a trowel portion.
It is provided with a connecting arm portion extending upward from the left and right ends of the iron body and allowing a current from a power source to flow through the iron body to raise the temperature of the iron body.
The iron body is a heater tip characterized in that the plate thickness is thinner than the plate thickness of the connecting arm portion and the cross-sectional area is set smaller than the cross-sectional area of the connecting arm portion.
In the range from the lower part of the connecting arm portion to the iron body, a thin-walled portion is formed by extending the gouged portion along the direction from one connecting arm portion to the other connecting arm portion, and the bottom portion of the gouged portion is formed. The heater chip according to claim 1, wherein the surface of the thin-walled portion is the surface of the iron body.
The heater tip according to claim 2, wherein the iron tip portion is projected below the thin-walled portion.
The claim is characterized in that the thin-walled portion is formed on the connecting arm portion side with respect to the iron tip portion, and the thickness of the side surface of the iron body is formed thinner than the thickness of the connecting arm portion excluding the thin-walled portion. Item 2. The heater chip according to Item 2.
Any of claims 2 to 4, wherein the thin-walled portion is formed at a position separated from the iron tip portion, and the plate thickness of the iron tip portion is set to be the same as the plate thickness of the connecting arm portion. The heater tip described in.
Any of claims 2 to 4, wherein the thin portion is formed at a position separated from the iron tip portion, and the plate thickness of the iron tip portion is set thinner than the plate thickness of the connecting arm portion. The heater tip described in.
The heater tip according to any one of claims 1 to 6, wherein the center of each of the connecting arm portion, the iron body, and the iron tip portion in the thickness direction is located on the same plane.
The heater chip according to any one of claims 1 to 7, wherein an oxidation-resistant coating layer is formed at least on the surface of the iron portion.
The heater chip according to claim 8, wherein the oxidation-resistant coating layer is a nickel coating.
A heater chip unit characterized in that a temperature sensor is attached to the iron portion of the heater chip according to any one of claims 1 to 9.
The heater chip is
A trowel portion having the trowel tip portion in contact with the terminal lead wire in the trowel body, and a trowel portion.
A pair of connecting arms extending upward from the left and right ends of the iron body so as to be separated from each other and allowing a current from a power source to flow through the iron body to raise the temperature of the iron body.
A temperature measuring stop portion provided on the iron portion and to which the temperature measuring portion of the temperature sensor is fastened is provided.
The temperature measuring anchoring portion is provided with a pair of anchoring contact surfaces that the temperature measuring portion contacts, and is set to a state in which the separation distance between the anchoring contact surfaces gradually expands from the iron portion side to the upper side. The heater chip unit according to claim 1.