JP-7856161-B2 - Antenna device manufacturing method

JP7856161B2JP 7856161 B2JP7856161 B2JP 7856161B2JP-7856161-B2

Inventors

秦隆平
高橋信之
玄馬大地
森田淳司
谷田智也
前野解

Assignees

スミダコーポレーション株式会社

Dates

Publication Date: 20260511
Application Date: 20220929

Claims (11)

A method for manufacturing an antenna device having an antenna section in which a coil wire, whose coil core is covered with an insulating film, is wound, and a base having a pad section in which a part of the coil wire is brazed with a brazing material, A melting step in which a laser is irradiated onto the brazing material supplied on the pad portion and the brazing material melts, A removal step in which the coil wire is immersed in the molten brazing material, a portion of the insulating film is removed from the coil wire by the heat of the brazing material, and the coil wire and the pad portion are joined by the brazing material, This includes a wire arrangement step performed before the melting step, The base has a wire fixing portion for fixing the coil wire, In the wire arrangement step, one end of the coil wire is fixed to the wire fixing portion, and a portion of the coil wire is placed on the brazing material provided on the surface of the pad portion. A method for manufacturing an antenna device, wherein in the wire arrangement step, a pressurized portion, which is a portion of the length between one end and the part of the coil wire, is pressed toward the base so that the coil wire is pressed against the brazing material .
A method for manufacturing an antenna device according to claim 1, wherein the process is performed at a timing where a portion of the melting process and a portion of the removal process overlap.
The method for manufacturing an antenna device according to claim 1, wherein, in the melting step, the brazing material is supplied to the surface of the pad portion with a thickness equal to or greater than the diameter of the coil wire.
In the removal step, the insulating film is decomposed and removed from the coil wire, the method for manufacturing an antenna device according to any one of claims 1 to 3.
A method for manufacturing an antenna device according to any one of claims 1 to 3, wherein the temperature of at least one of the coil wire or the brazing material is measured during the melting step, and the amount of laser irradiation is controlled so that the temperature is within a predetermined range higher than the melting point of the brazing material.
The method for manufacturing an antenna device according to claim 5, wherein the amount of laser irradiation is controlled so that the temperature is within a predetermined range higher than the decomposition temperature of the insulating film.
The method for manufacturing an antenna device according to claim 1, wherein in the wire arrangement step, the brazing material is formed on the surface of the pad portion in a mountain shape having a slope that slopes downward from the center to the periphery of the pad portion , and the coil wire is pressed against the slope of the brazing material.
The method for manufacturing an antenna device according to claim 7 , wherein the coil wire is pressed against the slope toward the center of the pad portion.
A method for manufacturing an antenna device according to claim 1, comprising a cutting step in which, after the pad portion and the coil wire are joined with the brazing material, the coil wire and the base are cut, and a portion of the coil wire including one end and a portion of the base including the wire fixing portion are removed.
The base has a support portion against which the coil wire is pressed, causing the direction in which the coil wire is pulled out to change. In the wire arrangement step, the bent portion located between the portion and the end of the coil wire is pressed against the support portion of the base and bent. The method for manufacturing an antenna device according to claim 1 , wherein one end of the coil wire that has been bent at the bent portion is wrapped around the wire fixing portion of the base.
The method for manufacturing an antenna device according to claim 1 , wherein in the melting step, an inert gas is supplied to the brazing material in the direction in which the coil wire is pressurized.

Description

This invention relates to an antenna device and a method for manufacturing an antenna device. Some antenna devices have an antenna around which a coiled wire is wound, and the coiled wire is electrically connected to a circuit section by soldering or other means. Regarding this type of technology, Patent Document 1 discloses a method for manufacturing an RFID transponder having an antenna (4) made from a wound wire (2), the wound wire (2) being soldered to a solderable contact area (12). Specifically, as shown in Figure 1 of Patent Document 1, a solderable contact area (12) is provided on the upper surface of a semiconductor die (6). The contact area (12) is a metal plating made from a nickel-based alloy or the like. The end of the wound wire (2) is soldered to the contact area (12). Specifically, a laser is irradiated onto the area to be soldered, and the solder melts due to the laser, joining the wound wire (2) and the contact area (12). Special table 2014-505309 publication The aforementioned objectives, as well as other objectives, features, and advantages, will become even clearer from the preferred embodiments described below and the accompanying drawings. This is a perspective view showing an example of an antenna device according to the first embodiment of the present invention.This is a top view of the circuit section of the antenna device according to the first embodiment.This is a longitudinal cross-sectional view of the antenna device according to the first embodiment, taken in the direction of arrow III-III, along the dashed line shown in Figure 2.This is an enlarged view of X shown in Figure 2 of the antenna device according to the first embodiment.This is a longitudinal cross-sectional view of the antenna device according to the first embodiment, taken in the direction of the arrow V-V, along the dashed line shown in Figure 4.This is a perspective view of an antenna device to show an example of a manufacturing method for an antenna device according to the first embodiment.This is a top view of an antenna device to show an example of a manufacturing method for an antenna device according to the first embodiment.This is a longitudinal cross-sectional view of the antenna device according to the first embodiment, taken in the direction of arrow VIII-VIII, along the dashed line shown in Figure 7.This is a longitudinal cross-sectional view of the antenna device according to the first embodiment, taken in the direction of arrow IX-IX, along the dashed line shown in Figure 7.This is a perspective view showing an example of a pressurizing jig used in the manufacturing method of the antenna device according to the first embodiment.This is a perspective view showing an example of the installation of a pressure jig in the manufacturing method of an antenna device according to the first embodiment. The various components of the antenna device of the present invention do not need to be independent entities; it is permissible for multiple components to be formed as a single member, for one component to be formed from multiple members, for one component to be part of another component, for a part of one component to overlap with a part of another component, and so on. Furthermore, while the method for manufacturing the antenna device of the present invention may be described using a series of steps described in order, the order of these steps does not limit the order or timing of their execution. Therefore, when implementing the method for manufacturing the antenna device of the present invention, the order of the steps can be changed to the extent that it does not impede the content, and some or all of the execution timings of the steps may overlap. Embodiments of the present invention will be described below with reference to the drawings. In each drawing, corresponding components are denoted by the same reference numeral, and redundant explanations will be omitted as appropriate. In this embodiment, the directions of front, back, left, right, up, and down are defined and explained as shown in the figures. Furthermore, the front end of the base 30, antenna section 20, or coil wire 40 may be referred to as the front end, and the rear end as the rear end. The left-right direction may be referred to as the width direction, and the up-down direction as the height direction. In the left-right direction, the direction from the center line of the base toward the left or right is referred to as the outward side or outward direction, and the direction from the left or right toward the center line of the base is referred to as the inward side or inward direction. Additionally, the direction perpendicular to the up-down direction, i.e., the left-right and front-back directions together, may be referred to as the lateral direction. However, these are merely definitions for convenience to briefly explain the relative relationships of the components and do not limit the direction during manufacturing or use of the produ