JP4787604B2 - Coil device - Google Patents

Description

The present invention relates to a coil device, in particular, it relates to a coil device configured by winding wire on the core.

  For example, in order to detect the position of the endoscope, a plurality of coils are arranged in the arm portion of the endoscope, and a magnetic field is generated in the plurality of coils by supplying currents of the plurality of coils, and the coils are generated An endoscope apparatus has been developed that can detect the position and state of the arm portion by detecting the magnetic field generated from the outside to improve operability. The endoscope is inserted into a very narrow portion so as to visually recognize the inserted portion. In order to visually recognize the narrower portion, it is necessary to make the diameter of the arm portion thinner. For this reason, size reduction and diameter reduction of a coil were desired.

A conventional coil device has, for example, a configuration in which one end of a wire wound around an iron core is soldered to a printed wiring board provided at one end of the iron core, and an external lead wire is soldered to a land formed on the printed wiring board (See Patent Document 1).
Japanese Patent Laid-Open No. 9-129454

  However, in the conventional coil device, since a printed wiring board is used as a connection device, a certain size is required in consideration of a soldered portion, and it is difficult to reduce the diameter.

  Moreover, since it was necessary to solder the printed wiring board, there were problems such as poor work efficiency.

The present invention has been made in view of the above points, and an object of the present invention is to provide a coil device that is small and has good assemblability.

The present invention relates to a coil device including an iron core and a conductive wire wound around the iron core, and an external connection terminal for connecting the conductive wire to the outside is integrally formed at an end of the iron core. connection portions have a, the connecting portion, the externally connecting terminals plurality have a, the external connection terminal is connected to one end of said conductive wires at one end and the other end connected to an external a first terminal is connected to the other end of the conductive wire to one end, it has a second terminal to which the other end is connected to the external, the first terminal and the second terminal ends There is a shape extending in the same direction, the connecting portion to expose the side surface of the other end of said other end and said second terminal of said first terminal of said external connection terminals to an external have each other not face to a pair of exposed portions for performing the heat radiation, a groove for guiding the conductive wire the external Characterized in that it has on the outer peripheral side of the one end of the end and the second terminal of the first terminal of the connection terminals.

  The connection portion is characterized by having an exposed portion that exposes the external connection terminal to the outside and radiates heat. The iron core and the connecting portion are integrated by a resin mold. The external connection terminal extends in the extension direction of the external connection wire, and the external connection terminal and the external connection wire are joined in parallel to the extension direction.

  According to the present invention, by providing the connection portion integrally formed with the external connection terminal for connecting the conductive wire to the outside at the end of the iron core around which the conductive wire is wound, it can be configured in a small size, Assemblability can be improved.

〔Constitution〕
FIG. 1 is a perspective view of a first embodiment of the present invention, and FIG. 2 is a block diagram of the first embodiment of the present invention.

  The coil device 100 of this embodiment is a small coil device having an outer diameter of approximately 1.3 mm and a length of approximately 5.6 mm. The coil device 100 is attached to an endoscope or the like, and the position and state of the endoscope. Used for detection. The coil device 100 includes an iron core 111, a front cap 112, a rear cap 113, a coil 114, and a terminal cap 115.

  FIG. 3 is a diagram illustrating an assembly process of the coil device 100.

  First, as shown in FIG. 3A, the iron core 111 and the terminal cap 115 are attached to the insert mold.

  Here, the iron core 111 will be described.

  FIG. 4 shows a configuration diagram of the iron core 111. 4A is a side view, FIG. 4B is a front view, and FIG. 4C is a cross-sectional view.

  The iron core 111 is obtained by processing a Fe—Co-based magnetic metal material into a cylindrical shape having an outer diameter of approximately 0.8 mm and a length of approximately 5 mm, and includes a coil winding portion 121, engagement portions 122 and 123, and a recess. 124 is integrally formed. A conductive wire 114 is wound around the coil winding part 121 to form a coil. The engaging portions 122 and 123 are formed at both ends of the coil winding portion 121.

  The engaging portions 122 and 123 are each composed of a flange portion 131 and a groove portion 132. The first cap 112 is fixed to the engaging portion 121 by insert molding. The second cap 113 is fixed to the engaging portion 122 by insert molding. At this time, the resin constituting the first cap 112 and the second cap 113 is entangled with the flange portion 131 and the groove portion 132 of the engaging portions 121 and 122, and the bonding between the first cap 112 and the second cap 113 and the iron core 111 is strengthened. can do.

  Further, the recess 124 of the iron core 111 is provided on the end surfaces of the engaging portions 122 and 123. The recess 124 is engaged with the rotating shaft of the coil winding jig when the coil 114 is wound.

  The first cap 112 is, for example, an LCP (hydroxybenzoic acid polyester) resin having features such as heat resistance, dimensional stability, and low shrinkage rate, and has an outer diameter of approximately 1.24 mm and a thickness of approximately 1.55 mm. The ring-shaped engagement portion 121 of the iron core 111 is formed by insert molding.

  The second cap 113 is made of, for example, an LCP (hydroxybenzoic acid polyester) resin having features such as heat resistance, dimensional stability, and low shrinkage, and has an outer diameter of approximately 1.24 mm and a thickness of approximately 1.55 mm. An annular shape is formed on the engaging portion 122 of the iron core 111 by insert molding. On the side surface of the second cap 113, groove portions 141 and 142 communicating with the end surfaces in the directions of the arrows X1 and X2 are formed in portions facing each other. The conductive wire 114 is engaged with the grooves 141 and 142. By engaging the conductive wire 114 with the grooves 141 and 142, the conductive wire 114 can be prevented from protruding outside the second cap 113, which is effective in reducing the diameter.

  Note that the terminal cap 115 is also inserted into the mold at the time of insert molding, and is integrated with the iron core 111, the first cap 112, and the second cap 113.

  FIG. 5 shows a configuration diagram of the terminal cap 115. FIG. 6 is a view showing a state after the first cap 112 and the second cap 113 are insert-molded by inserting the iron core 111 and the terminal cap 115.

  The terminal cap 115 includes a first terminal 151, a second terminal 152, and a mold resin portion 153. The first terminal 151 and the second terminal 152 are formed by punching a metal plate, and are insert-molded in the mold resin portion 153. The first terminal 151 and the second terminal 152 each have a coil connection terminal 161, an external connection terminal 162, and a connecting portion 163.

  The coil connection terminal 161 and the external connection terminal 162 have tip portions extending from the mold resin portion 153 in the longitudinal direction of the coil device 100 and in the direction of the arrow X1, which is the extension direction of the external connection wire 117. The connecting portion 163 is embedded in the mold resin portion 153 and connects the coil connection terminal 161 and the external connection terminal 162.

  The mold resin portion 153 is made of, for example, an LCP (hydroxybenzoic acid polyester) resin having the same material as the first cap 112 and the second cap 113, such as heat resistance, dimensional stability, and low shrinkage rate. The terminal 151 and the second terminal 152 are integrally molded by insert molding. Openings 171, 172, grooves 173, 174, and a center hole 175 are integrally formed in the mold resin portion 153.

  The openings 171 and 172 expose the side surfaces of the external connection terminals 162 constituting the first terminal 151 and the second terminal 152 from the mold resin part 153. The heat radiation properties of the first terminal 151 and the second terminal 152 can be improved by the openings 171 and 172. Thereby, for example, heat generated during welding or soldering can be efficiently radiated to the outside. Therefore, disconnection of the conductive wire 114 due to heat can be prevented. The groove portions 173 and 174 guide the connection wire 114 extending from the coil winding portion 121 to the coil connection terminal 161.

By molding the first cap 112 and the second cap 113 by inserting the iron core 111 and the terminal cap 115, the first cap 112, the second cap 113, and the terminal cap 115 are formed as shown in FIG. Molded integrally with the iron core 111. At this time, the grooves 141 and 142 of the second cap 113 are formed at the same time. As shown in FIG. 6, the groove portions 141 and 142 are formed so as to communicate with the groove portions 173 and 174 of the terminal cap 115. As a result, a groove is formed which communicates from the coil winding portion 121 to the end face of the terminal cap 115 on the arrow X1 direction side.
Further, the resin constituting the second cap 113 enters the center hole 175 of the terminal cap 115, and the bonding between the terminal cap 115 and the second cap 113 is strengthened.

  Next, the conductive wire 114 is wound around the coil connection terminal 161 of the first terminal 151 of the terminal cap 115. After the conductive wire 114 is wound around the coil connection terminal 161, the conductive wire 114 is further guided to the coil winding portion 121 of the iron core 111 through the communicating groove portions 141 and 173. The conductive wire 114 is guided to the coil winding part 121 and then wound around the coil winding part 121 of the iron core 111 as shown in FIG. When a predetermined number of turns of the conductive wire 114 is wound around the coil winding portion 121, the coil connection of the second terminal 152 of the terminal cap 115 passes through the groove portions 142 and 174 that communicate with each other as shown in FIG. It is wound around the terminal 162.

  7 and 8 are diagrams for explaining a method of joining a wire to the first terminal 151 and the second terminal 152. FIG.

  Next, as shown in FIG. 7A, the external connection terminal 162 of the first terminal 151 is grounded, the arc welding electrode 181 is brought close to the coil connection terminal 161, and a high voltage is applied. As a result, arc discharge occurs between the coil connection terminal 161 and the arc welding electrode 181. The coil connection terminal 161 is melted by the arc discharge, and the conductive wire 114 is joined to the coil connection terminal 161. Note that the conductive wire 114 is joined to the coil connection terminal 161 by the same method also at the second terminal 152.

  Next, as shown in FIG. 7B, with the coil connection terminal 161 grounded and the external connection wire 117 engaged with the external connection terminal 162, the arc welding electrode 181 is brought close to the external connection terminal 162. By applying a high voltage, an arc discharge is generated between the external connection terminal 162 and the arc welding electrode 181, and the external connection wire 117 and the external connection terminal 162 are arc welded. Note that the external connection wire 117 is joined to the external connection terminal 162 in the same manner also in the second terminal 152.

  As described above, as shown in FIG. 8, the conductive wire 114 and the external connection wire 117 constituting the coil are connected via the first terminal 151 and the second terminal 152 of the terminal cap 115.

  At this time, in this embodiment, the coil connection terminal 161 and the external connection terminal 162 can be arranged sufficiently apart from each other by connecting the coil connection terminal 161 and the external connection terminal 162 via the connection portion 163. It is possible to perform arc welding as described above.

Note that the joining of the conductive wire 114 and the external connection wire 117 to the first terminal 151 and the second terminal 152 is not limited to arc welding, and may be performed by soldering or the like. At this time, in this embodiment, the coil connection terminal 161 and the external connection terminal 162 can be arranged sufficiently apart from each other by connecting the coil connection terminal 161 and the external connection terminal 162 via the connection portion 163. Soldering can be done easily. Since the coil device 100 of this embodiment is small and the conductive wire 114 is also a thin wire, these joining operations are manual operations in order to avoid disconnection of the conductive wire 114. At this time, by arranging the coil connection terminal 161 and the external connection terminal 162 sufficiently apart from each other, the work can be easily performed and the work efficiency can be improved.
In the present embodiment, the terminal cap 115 is insert-molded in advance, and then the second cap 113 is insert-molded so that the terminal cap 115 and the second cap 113 are integrated. However, the terminal cap 115 and the second cap 113 may be simultaneously formed by insert molding.

[Second Embodiment]
FIG. 9 is a configuration diagram of the second embodiment of the present invention, and FIG. 10 is a diagram showing an assembly process of the coil device 200.

  The coil device 200 according to this embodiment includes an iron core 211, a terminal cap 212, a terminal cap 213, and a conductive wire 214. The iron core 211 is formed by processing a Fe—Co-based magnetic metal material into a cylindrical shape having an outer diameter of approximately 0.8 mm and a length of approximately 5 mm. A terminal cap 212 is attached to one end and a terminal is connected to the other end. A cap 213 is attached.

  The end cap 212 is, for example, an LCP (hydroxybenzoic acid polyester) resin having features such as heat resistance, dimensional stability, and low shrinkage, and an outer diameter of about 1.24 mm and a thickness of about 1.55 mm. One end of the iron core 211 is press-fitted into the inner peripheral portion and fixed to one end of the iron core 211.

  The terminal cap 213 is made of, for example, the first terminal 221 and the second terminal made of LCP (hydroxybenzoic acid polyester) resin having the characteristics such as heat resistance, dimensional stability, and low shrinkage rate, which are the same material as the end cap 212. The terminal 222 is inserted and molded by insert molding integrally. The first terminal 221 and the second terminal 222 are integrated with the mold resin portion 223, and each have a coil connection terminal 231, an external connection terminal 232, and a connection portion 233.

  The coil connection terminal 231 and the external connection terminal 232 have tip portions extending from the mold resin portion 223 in the longitudinal direction of the coil device 200 and in the direction of the arrow X1, which is the extension direction of the external connection wire 217. The connecting portion 233 is embedded in the mold resin portion 233 and connects the coil connection terminal 161 and the external connection terminal 162. In the mold resin part 223, a press-fitting part 241, a central hole 242, and a groove part 243 are integrally formed.

  The terminal cap 213 is fixed to the iron core 211 by press-fitting the other end of the iron core 211 into the press-fit portion 241. The center hole 242 communicates with the inner peripheral portion of the iron core 211. The groove portion 243 is formed on the side surface of the terminal cap 213 and guides the conductive wire 214.

  Next, a method for assembling the coil device 200 will be described.

  First, the terminal cap 212 and the terminal cap 213 are fixed to the iron core 211 as shown in FIG. Next, as shown in FIG. 10C, the conductive wire 114 is wound around the coil connection terminal 231 of the first terminal 221. Further, as shown in FIG. 10C, the conductive wire 214 is engaged with the groove 243, guided to the iron core 211, and wound around the iron core 211. Next, as shown in FIG. 10 (D), the conductive wire 214 is wound around the iron core 211 by a predetermined number of times, and then engaged with the groove 243 and guided to the coil connection terminal 231 of the second terminal 222 for coil connection. Winding around the terminal 231.

  Finally, the conductive wire 214 and the external connection wire 217 are joined to the first terminal 221 and the second terminal 222 in the same manner as the coil device 100.

According to the present embodiment, it can be assembled by a simple process.
In this embodiment, the terminal cap 213 and the terminal cap 212 are separately molded and then attached to the iron core 211. However, the terminal cap 213 and the terminal cap 212 are connected to the first terminal 221 and the second terminal 222, respectively. Also, insert molding may be performed together with the iron core 211.

[Application example]
FIG. 11 is a diagram illustrating an application example of the coil devices 100 and 200.

  This application example shows a state in which the coil devices 100 and 200 of the present embodiment are mounted on the endoscope apparatus 400. A plurality of coil devices 100 and 200 are provided at predetermined intervals along the extending direction of the arm portion 401 of the endoscope device 400. At this time, the coil devices 100 and 200 are arranged so that the directions of the arrows X1 and X2 of the coil devices 100 and 200 are the extending direction of the arm portion 401 of the endoscope device 400. Accordingly, the coil devices 100 and 200 can be arranged without increasing the diameter of the arm portion 401 of the endoscope device 400.

1 is a perspective view of a first embodiment of the present invention. It is a block diagram of 1st Example of this invention. FIG. 4 is a diagram showing an assembly process of the coil device 100. 2 is a configuration diagram of an iron core 111. FIG. It is a block diagram of the terminal cap 115. It is a figure which shows the state after insert-molding by inserting the iron core 111 and the terminal cap 115 in the 1st cap 112 and the 2nd cap 113. FIG. It is a figure for demonstrating the joining method of the wire to the 1st terminal 151 and the 2nd terminal 152. FIG. It is a figure for demonstrating the joining method of the wire to the 1st terminal 151 and the 2nd terminal 152. FIG. FIG. 10 is a block diagram of a second embodiment of the present invention. 5 is a diagram illustrating an assembly process of the coil device 200. FIG. It is a figure which shows the example of application of the coil apparatus 100,200.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Coil apparatus 111 Iron core, 112 Front cap, 113 Rear cap, 114 Conductive wire 115 Terminal cap 121 Coil winding part, 122, 123 Engagement part 131 Collar part, 132 Groove part 141 Concave part 151 First terminal, 152 2nd Terminals 152 and 153 Mold resin part 161 Coil connection terminal, 162 External connection terminal, 163 Connection part 171, 172 Opening part, 173, 174 Groove part, 175 Center hole

Claims (3)

In a coil device comprising an iron core and a conductive wire wound around the iron core, a connection part in which an external connection terminal for connecting the conductive wire to the outside is integrally formed at an end of the iron core have a, the connecting portion, the external connection terminals and multiple perforated, the external connection terminals, one end of the conductive wire is connected to one end, a first terminal to which the other end is connected to an external When, is connected to the other end of the conductive wire at one end, the other end have a second terminal connected to the external, the first terminal and the second terminal ends the same direction is the extended shape in the connecting portion, the side surface of the other end of said other end and said second terminal of said first terminal of said external connection terminals are exposed to the outside, performing heat radiation have each other not face to a pair of exposed portions, a groove for guiding the conductive wire the external connection terminal Coil means, comprising the outer peripheral side of the one end of the end and the second terminal of the first terminal. The coil device according to claim 1, wherein the iron core and the connection portion are integrated by a resin mold. The external connection terminal extends in the extending direction of the external connection wire,
The coil device according to claim 1, wherein the external connection terminal and the external connection wire are joined in parallel to an extension direction thereof.

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