JP2003025374A - Method for manufacturing small-sized antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a small-sized antenna wherein an antenna conductor pattern 10 and a dielectric molded object are integrated, by setting the antenna conductor pattern 10 to the cavity formed by molds 22A and 22B to injection-mold a dielectric material so as not to generate a crack or deformation in the dielectric molded object, even if the ejection speed of the dielectric molded object from the molds is increased. SOLUTION: The thicknesses of the dielectric molded object on one surface and other surface of the antenna conductor pattern 10 are differentiated and an ejector pin 26 is allowed to impinge against the thicker surface of the dielectric molded object, when the dielectric molded object is taken out by opening the molds 22A and 22B after injection molding to eject the dielectric molded object.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a small antenna used in a small communication device such as a mobile phone.

[0002]

2. Description of the Related Art As a small antenna, there is one in which an antenna conductor pattern is formed of a thin metal plate and this antenna conductor pattern is integrated with a dielectric. A small antenna having such a structure is a so-called insert in which an antenna conductor pattern formed in a required shape is set in a mold and a dielectric material is injection molded to integrate the antenna conductor pattern and the dielectric molded body. It is manufactured by the molding method.

[0003]

Since the small antenna is mounted in a small communication device such as a mobile phone, it is required to be as thin as possible. In order to make the small antenna thin, it is necessary to make the dielectric compact thin. However, when a small antenna having a thin dielectric body is manufactured by the injection molding method, the following problems may occur.

That is, when the antenna conductor pattern is inserted into the mold, the dielectric material is injected into the cavity of the mold, and then the mold is opened to eject the dielectric molded body (projection). If the speed is high, defects such as cracks in the dielectric body or deformation of the antenna conductor pattern are likely to occur.

Further, when the dielectric molded body is ejected from the die, there is a push mark (recess) of the protrusion pin on the surface of the dielectric molded body, and this push mark automatically mounts a small antenna later by a mounter. At this time, if it can be picked up by suction, air leakage may occur and it may not be possible to reliably pick up.

Therefore, it is a first object of the present invention to provide a method for manufacturing a small antenna in which cracks in a dielectric body and deformation of an antenna conductor pattern are unlikely to occur even when a protrusion speed is increased.

A second object of the present invention is to provide a method for manufacturing a small antenna in which a pickup error is less likely to occur during automatic mounting by a mounter.

[0008]

Means for Solving the Problems In order to achieve the above first object, the present invention is to set an antenna conductor pattern in a mold and injection-mold a dielectric material to form an antenna conductor pattern and a dielectric molded body. In the method for manufacturing a small antenna in which the two are integrated, the thickness of the dielectric molded body is made different on one surface and the other surface of the antenna conductor pattern, and after injection molding, the mold is opened to form the dielectric molded body. It is characterized in that, at the time of taking out, the ejecting pin is applied to the thicker surface of the dielectric molded body to eject it. If you do this,
Since the strength of the dielectric molded body on the side where the ejection pin abuts is increased, the ejection operation at a higher speed can be endured.

In order to achieve the above-mentioned second object, the present invention sets the antenna conductor pattern in a mold, injection-molds a dielectric material, and integrates the antenna conductor pattern and the dielectric molded body. In a method of manufacturing a small antenna, when a mold is opened and a dielectric molded body is taken out after injection molding, a protrusion pin is applied to a position avoiding the central portion of the upper surface and the lower surface of the dielectric molded body to protrude. It is characterized by that. In the small antenna manufactured in this way, the position where it is sucked by the mounter is a flat surface without the pushing marks of the protruding pins, so there is no risk of air leakage when picking up, and it is possible to reduce pickup mistakes. it can.

In the method for manufacturing a small antenna of the present invention,
A composite material of resin and ceramics is preferably used as the dielectric material. Since such a composite material has a high dielectric constant, is excellent in temperature and humidity stability, and can be injection-molded, a practical small antenna can be efficiently manufactured by an injection molding method.

[0011]

Embodiments of the present invention will be described below.
A detailed description will be given with reference to the drawings.

FIG. 1 shows an example of an antenna conductor pattern set in a mold. This antenna conductor pattern 10
Has a rectangular flat radiating conductor pattern 12 and a frame 14 surrounding the radiating conductor pattern 12, and the radiating conductor pattern 12 and the frame 14 are power supply terminals formed on one edge of the radiating conductor pattern 12. The portion 16 and the ground terminal portion 18 are connected to each other by the fixed terminal portion 20 formed on the other edge. Positioning holes are formed in the four corners of the frame 14, but the illustration is omitted.

First, the antenna conductor pattern 10 is
As shown in FIG. 2, the molds 22A and 22B for injection molding are set. That is, the frame 14 and the outer end sides of the respective terminal portions 16, 18, 20 are sandwiched by the dividing surfaces of the upper die 22A and the lower die 22B, and the entire radiation conductor pattern 12 and the respective terminal portions 16, 18, 20 are provided. The part on the inner end side is set so as to be positioned in the cavity 24 of the molds 22A and 22B. Since the molds 22A and 22B have different thicknesses of the dielectric molded body on the upper and lower surfaces of the antenna conductor pattern 10,
The cavity 24 of the lower mold 22B is formed deeper than the cavity 24 of the upper mold 22A. Further, a protruding die 26 of a dielectric body is provided on the lower die 22B having a deeper cavity 24.

In the state of FIG. 2, a dielectric material is injected into the cavity 24 and injection molding is performed. As the dielectric material, a composite material that allows injection molding by mixing resin and ceramics is used. After the molding, the molds 22A and 22B are opened as shown in FIG. 3, and the ejection pin 26 is ejected as shown in FIG. 4 to take out the dielectric compact 28 from the lower die 22B. At this time, since the ejector pin 26 protrudes the thicker (higher strength) of the dielectric molded body 28, even if the protruding speed is increased, cracks may occur in the dielectric molded body or the antenna conductor There is little risk of deformation of the pattern.

After that, if the outer ends of the terminal portions 16, 18, and 20 are separated from the frame 14 and bent, a small antenna 30 as shown in FIG. 5 is obtained. In the small antenna 30 manufactured in this manner, there are protrusion marks of the protruding pins on the lower surface of the dielectric molded body 28, but the mold surface is transferred to the central portion of the upper surface of the dielectric molded body 28 that is sucked by the mounter. Since it has a smooth surface, there is no risk of air leakage when picking up, and mistakes in picking up can be reduced.

In the above-described embodiment, when the dielectric molded body is taken out from the mold, the protruding pin is applied to the lower surface of the dielectric molded body, but the protruding pin is applied to the upper surface of the dielectric molded body. When the dielectric molded body is taken out by the method, as shown in FIG. 6, the protruding pin may be applied to the position indicated by the arrow P, that is, the position avoiding the central portion of the upper surface.

[0017]

As described above, according to the present invention,
The thickness of the dielectric molded body is different on both sides of the antenna conductor pattern, and the protruding pin is applied to the thicker surface of the dielectric molded body so that it sticks out. The strength of the body is increased, and it is possible to endure a higher speed ejecting operation, which can improve the production efficiency.

Further, according to the present invention, when the die is opened and the dielectric compact is taken out, the protrusion pin is applied to a position avoiding the central portion of the upper surface of the dielectric compact so that the dielectric compact is ejected. The manufactured small antenna has a flat surface at a position where it is sucked by the mounter and does not have a push pin dent, and there is no risk of air leakage when picking up, and pick-up errors can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of an antenna conductor pattern used in an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where an antenna conductor pattern is set in a mold according to the embodiment of the present invention.

FIG. 3 is a sectional view showing a state in which the mold is opened after injection molding.

FIG. 4 is a sectional view showing a state where the dielectric compact is taken out from the mold.

5A and 5B are a plan view and a front view showing a small antenna manufactured according to an embodiment of the present invention.

FIG. 6 is an explanatory view showing a protruding position of a protruding pin according to another embodiment of the present invention.

[Explanation of symbols]

10: Antenna conductor pattern 12: Radiation conductor pattern 14: Frame 16: Power supply terminal 18: Ground terminal part 20: Fixed terminal 22A, 22B: Mold 24: Cavity 26: protruding pin 28: Dielectric molding 30: Small antenna

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koichi Kamei             2-6-1, Marunouchi, Chiyoda-ku, Tokyo             Kawa Electric Industry Co., Ltd. (72) Inventor Takahiro Ueno             2-6-1, Marunouchi, Chiyoda-ku, Tokyo             Kawa Electric Industry Co., Ltd. F term (reference) 4F202 AD04 AD05 AD08 AG03 AH41                       CA11 CB01 CB12 CK11 CL02                       CM02 CQ01                 4F206 JA07 JB11 JF05 JQ81                 5J046 AA05 AA19 AB13 PA07

Claims (3)

[Claims] 1. An antenna conductor pattern (10) is attached to a die (22).
A, 22B) and injection molding the dielectric material,
In a method of manufacturing a small antenna in which an antenna conductor pattern (10) and a dielectric molded body (28) are integrated, a method for manufacturing a small-sized antenna in which the dielectric molded body (28) is formed on one surface and the other surface of the antenna conductor pattern (10). After injection molding with different thicknesses, the mold (22
A, 22B) are opened and the dielectric molded body (28) is taken out, the dielectric molded body (28) is ejected by applying a protrusion pin (26) to the thicker surface of the dielectric molded body (28) and is small in size. Antenna manufacturing method. 2. The antenna conductor pattern (10) is attached to a mold (22
A, 22B) and injection molding the dielectric material,
In a method for manufacturing a small antenna in which an antenna conductor pattern (10) and a dielectric molded body (28) are integrated, a die (22A, 22B) is opened after injection molding to open the dielectric molded body (2).
When taking out 8), eject pin (26) at a position avoiding the center of the upper surface of the upper and lower surfaces of dielectric body (28).
A method for manufacturing a small antenna, which is characterized in that a small antenna is projected. 3. The method for manufacturing a small antenna according to claim 1, wherein a composite material of resin and ceramics is used as the dielectric material.