WO2023211008A1

WO2023211008A1 - Antenna pattern manufacturing method

Info

Publication number: WO2023211008A1
Application number: PCT/KR2023/004814
Authority: WO
Inventors: 노진원; 정의진; 정을영; 임기상; 맹주승
Original assignee: 주식회사 아모텍
Priority date: 2022-04-29
Filing date: 2023-04-10
Publication date: 2023-11-02
Also published as: KR20230153772A

Abstract

The present invention provides an antenna pattern manufacturing method in which: a half groove is formed in each of a first surface and a second surface of a metal sheet through a primary etching; and the half groove formed on the first surface and the second surface of the metal sheet forms a through-hole through the metal sheet so as to form a line spacing (or line width) of an antenna pattern to be less than the thickness of the antenna pattern, thereby increasing the degree of freedom in a design of antenna patterns and enabling performance optimization design.

Description

Antenna pattern manufacturing method

The present invention relates to a method of manufacturing an antenna pattern, and more specifically, to a method of manufacturing a loop-shaped antenna pattern that is mounted on a portable terminal and used for wireless power transmission and reception or communication.

Recently, market demand for high power wireless charging of 20W or more is increasing for fast charging. Compared to general charging methods, high-output wireless charging applies a higher voltage to the antenna and substrate for wireless power transmission/reception, which can reduce charging efficiency or, in extreme cases, cause a fire.

Accordingly, in the high-output wireless charging market, the importance of not only wireless charging efficiency but also heat suppression is increasing, and the thickness of the antenna is becoming thicker for charging efficiency and heat suppression.

Coil winding method, pattern printing method, and hybrid method are mainly used to manufacture antennas for wireless power transmission/reception.

However, the conventional manufacturing method cannot precisely form the line spacing (or line width) of the pattern when the thickness of the antenna becomes thick. Accordingly, antennas manufactured using conventional manufacturing methods can suppress heat generation, but have the problem of reduced charging efficiency.

The matters described in the above background technology are intended to aid understanding of the background of the invention and may include matters that are not disclosed prior art.

The present invention was proposed to solve the above problems, and its purpose is to provide a method of manufacturing an antenna pattern that precisely forms the line spacing (or line width) of the antenna pattern by forming a through hole in a metal sheet through a double etching process. Do it as

In order to achieve the above object, the method of manufacturing an antenna pattern according to an embodiment of the present invention includes the steps of laminating a carrier sheet to the first side of a metal sheet, exposing the second side of the metal sheet opposite to the first side, Half-etching the second side of the metal sheet to form a first half groove cut in the inner direction of the metal sheet on the second side of the metal sheet, applying a coverlay sheet to the second side of the metal sheet on which the first half groove is formed. lamination, removing the carrier sheet laminated to the first side of the metal sheet, exposing the first side of the metal sheet from which the carrier sheet has been removed, and half-etching the first side of the metal sheet to form the metal sheet. and forming a second half-groove on the first side toward the inside of the metal sheet.

In the step of forming the second half groove, the second half groove may be formed so that at least part of the groove overlaps the first half groove.

The first half groove and the second half groove may form a through hole penetrating the first and second sides of the metal sheet.

The through hole forms the line spacing of the antenna pattern, and the line spacing of the antenna pattern may be equal to the thickness of the metal sheet. The width of the through hole may be less than or equal to the thickness of the metal sheet. The width of the through hole may be 80% or more and 120% or less of the thickness of the metal sheet.

In the step of forming the first half groove, a first half groove having a first central axis vertically penetrating the first and second sides of the metal sheet is formed, and in the step of forming the second half groove, the first half groove of the metal sheet is formed. A second half groove may be formed having a second central axis vertically penetrating the first and second surfaces, and the first central axis and the second central axis may be spaced apart.

In the step of forming the first half groove, a first half groove having a first central axis vertically penetrating the first and second sides of the metal sheet is formed, and in the step of forming the second half groove, the first half groove of the metal sheet is formed. A second half groove may be formed having a second central axis vertically penetrating the first and second surfaces, and the first central axis and the second central axis may be disposed on the same line.

The metal sheet is a plate-shaped substrate with a set thickness, and the set thickness may be 70 um or more.

The method may further include surface treating the first side of the metal sheet on which the second half groove is formed, and in the surface treatment step, a rust prevention film may be formed on the first side of the metal sheet.

The method may further include forming an outline of the antenna pattern by stamping the metal sheet on which the second half groove is formed.

According to the present invention, the antenna pattern manufacturing method divides the etching process into two steps (i.e., the first half-groove forming step and the second half-groove forming step), thereby improving the antenna pattern compared to the antenna pattern formed by the conventional antenna pattern manufacturing method. It has the effect of reducing line spacing and/or line width by about 50%.

In addition, the antenna pattern manufacturing method reduces the width of the through hole (i.e., the line spacing or line width of the antenna pattern) by about 50% compared to the conventional method, allowing a line spacing (pitch) of 100um or less even in a metal sheet with a thickness of 3oz (105um) or more. There is an effect of being able to produce an antenna pattern with

In addition, the antenna pattern manufacturing method allows the production of an antenna pattern with a line spacing of about 80% to 120% of the metal thickness, which increases design freedom and enables performance-optimized design.

1 is a diagram for explaining a method of manufacturing an antenna pattern according to an embodiment of the present invention.

Figure 2 is a flowchart illustrating a method of manufacturing an antenna pattern according to an embodiment of the present invention.

3 and 4 are diagrams for explaining each step of the antenna pattern manufacturing method according to an embodiment of the present invention.

5 and 6 are diagrams for explaining through holes formed in a metal sheet through a first half groove forming step and a second half groove forming step.

7 and 8 are diagrams for comparing and explaining the conventional antenna pattern manufacturing method and the antenna pattern manufacturing method of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

The examples are provided to more completely explain the present invention to those skilled in the art, and the following examples may be modified in various other forms, and the scope of the present invention is limited to the following examples. It is not limited. Rather, these embodiments are provided to make the disclosure more faithful and complete and to fully convey the spirit of the invention.

The terms used herein are used to describe specific embodiments and are not intended to limit the invention. Additionally, in this specification, singular forms may include plural forms, unless the context clearly indicates otherwise.

In the description of the embodiment, each layer (film), region, pattern or structure is said to be formed “on” or “under” the substrate, each layer (film), region, pad or pattern. Where described, “on” and “under” include both being formed “directly” or “indirectly” through another layer. In addition, in principle, the standards for the top or bottom of each floor are based on the drawing.

The drawings are only intended to enable understanding of the spirit of the present invention, and should not be construed as limiting the scope of the present invention by the drawings. Additionally, in the drawings, relative thickness, length, or relative size may be exaggerated for convenience and clarity of explanation.

Referring to FIG. 1, the antenna pattern manufacturing method according to an embodiment of the present invention manufactures a loop-shaped antenna pattern 100 using a metal sheet 110. The antenna pattern 100 manufactured through the antenna pattern manufacturing method is an antenna pattern for wireless power transmission/reception (WPC; Wireless Power Consortium), an antenna pattern for near field communication (NFC; Near Field Communication), and an antenna pattern for electronic payment (MST; Magnetic Secure). It can be used as an antenna pattern for transmission, etc.

The antenna pattern manufacturing method according to an embodiment of the present invention may be used to manufacture a combo antenna pattern including two or more of WPC, NFC, and MST.

Additionally, one or more antenna patterns 100 manufactured by the antenna pattern manufacturing method according to an embodiment of the present invention may be assembled on a circuit board (FPCB) to form a single antenna or a combo antenna. At this time, the antenna pattern 100 may be assembled on the circuit board through a soldering process, ultrasonic welding process, etc.

At this time, at least one antenna pattern among the NFC antenna pattern and the MST antenna pattern and terminal portions for connecting the antenna patterns to an external board (for example, the main board of a mobile terminal) are formed on the circuit board, and in an embodiment of the present invention, The WPC antenna pattern 100 manufactured by the following antenna pattern manufacturing method may be assembled into a circuit board through a soldering process, an ultrasonic welding process, etc., and a combo antenna may be formed by assembling a shielding sheet, a heat dissipation sheet, etc.

2 to 4, the antenna pattern manufacturing method according to an embodiment of the present invention includes a carrier sheet lamination step (S110), a first exposure step (S120), a first half groove forming step (S130), and a coverlay sheet. It includes a lamination step (S140), a carrier sheet removal step (S150), a second exposure step (S160), a second half groove forming step (S170), a surface treatment step (S180), and a stamping step (S190).

In the carrier sheet lamination step (S110), the carrier sheet 120 is laminated to the first side of the metal sheet 110. In the carrier sheet lamination step (S110), the carrier sheet 120 is laminated to the first surface (that is, the upper surface of the metal sheet 110) of the metal sheet 110 having a thickness equal to or greater than the set thickness.

In the carrier sheet lamination step (S110), a metal sheet 110 having a thickness of approximately 2oz (i.e., approximately 70um) or more is prepared. At this time, in the carrier sheet lamination step (S110), a metal sheet 110 made of copper (Cu) used for the general antenna pattern 100 is prepared.

In the carrier sheet lamination step (S110), an amorphous solid or semi-solid resin made of polymers such as polyimide (PI), polyethylene terephthalate (PET), or organic compounds and their derivatives is prepared as the carrier sheet 120.

In the carrier sheet lamination step (S110), for example, the carrier sheet 120 is laminated to the first side of the metal sheet 110 through a roll to roll process.

In the first exposure step (S120), the second surface of the metal sheet 110 is exposed.

In the first exposure step (S120), an exposure film (photoresist film) 130 is laminated on the second side of the metal sheet 110 on which the carrier sheet 120 is laminated. At this time, in the first exposure step (S120), a photoresist may be applied to the second side of the metal sheet 110 on which the carrier sheet 120 is laminated.

In the first exposure step (S120), an antenna pattern mask is laminated (or placed) on the second side of the metal sheet 110 on which the exposure film 130 is laminated, and the metal sheet 110 is exposed through an exposure device. UV light is shined on the second side of . Accordingly, the exposure film 130 laminated on the second surface of the metal sheet 110 is cured into the same shape as the antenna pattern 100 of the antenna pattern mask.

In the first half groove forming step ( S130 ), the first half groove 112 is formed in the metal sheet 110 by etching the second surface of the metal sheet 110 that has undergone the first exposure step.

In the first half groove forming step (S130), the second surface of the metal sheet 110 on which the exposure film 130 is laminated is etched. In the first half groove forming step (S130), the second surface of the metal sheet 110 on which the exposure film 130 is laminated is etched through an etching process such as wet etching or dry etching. Accordingly, a first half groove 112 is formed in the metal sheet 110 from the second surface of the metal sheet 110 toward the inside of the metal sheet 110.

In the first half groove forming step (S130), the cured exposure film 130 is removed after the first half groove 112 is formed.

In the coverlay sheet lamination step (S140), the coverlay sheet 140 is laminated to the second side of the metal sheet 110 on which the first half groove 112 is formed. In the coverlay sheet lamination step (S140), the coverlay sheet 140 is laminated to the second side of the metal sheet 110 on which the first half groove 112 is formed. At this time, the coverlay sheet 140 is an example of a sheet formed of a material such as PI, PET, or thermosetting resin.

In the carrier sheet removal step (S150), the carrier sheet 120 is removed from the metal sheet 110 on which the coverlay sheet 140 is laminated to the first side. In the carrier sheet removal step (S150), the carrier sheet 120 laminated to the second side of the metal sheet 110 is removed.

In the second exposure step (S160), the first side of the metal sheet 110 is exposed.

In the second exposure step (S160), the exposure film 130 is laminated on the first side of the metal sheet 110 on which the carrier sheet 120 is laminated. At this time, in the second exposure step (S160), the photoresist may be applied to the first side of the metal sheet 110 on which the coverlay sheet 140 is laminated.

In the second exposure step (S160), the antenna pattern mask is stacked (or placed) on the first side of the metal sheet 110 on which the exposure film 130 is laminated, and the first surface of the metal sheet 110 is exposed through an exposure device. Shine UV light on the cotton. Accordingly, the exposure film 130 laminated on the first surface of the metal sheet 110 is cured into the same shape as the antenna pattern 100 of the antenna pattern mask.

In the second half groove forming step (S170), the first side of the metal sheet 110 is etched to form a second half groove 114 in the metal sheet 110.

In the second half groove forming step (S170), the first side of the metal sheet 110 that has undergone the second exposure step is etched to form a second half groove 114 in the metal sheet 110.

In the second half groove forming step (S170), the first side of the metal sheet 110 on which the exposure film 130 is laminated is etched. In the second half groove forming step (S170), the first side of the metal sheet 110 on which the exposure film 130 is laminated is etched through an etching process such as wet etching or dry etching. Accordingly, a second half groove 114 is formed in the metal sheet 110 from the first surface of the metal sheet 110 toward the inside of the metal sheet 110.

At this time, in the second half groove forming step (S170), the second half groove 114 is formed so that at least part of the first half groove 112 overlaps with the first half groove forming step (S130). Accordingly, the first half groove 112 and the second half groove 114 form a through hole 116 penetrating the metal sheet 110, and the through hole 116 is formed by the metal sheet 110. The line spacing of the antenna pattern 100 is formed.

Referring to FIG. 5, the central axis (A) of the first half groove 112 and the central axis (B) of the second half groove 114 vertically penetrate the first and second surfaces of the metal sheet 110. ) are coincident (i.e., disposed on the same line), and the through hole 116 is formed in an “8” shape that penetrates the metal sheet 110 vertically.

However, referring to FIG. 6, since it is very difficult to accurately align the first half groove 112 and the second half groove 114 in the actual process, the central axis A of the first half groove 112 and The central axes B of the second half grooves 114 are offset from each other in the horizontal direction in the drawing, and the through hole 116 may be formed in an inclined “8” shape that penetrates the metal sheet 110 diagonally.

Here, in FIGS. 5 and 6, it is shown that an “8” shaped through hole 116 is formed as a groove is formed at the ends of the two metal sheets 110 adjacent to the hole 116, but the present invention is not limited thereto. A groove may be formed at one end of the two metal sheets 110 adjacent to the through hole 116 to form a “B” shaped through hole 116.

In the second half groove forming step (S170), the cured exposure film 130 is removed after the second half groove 114 is formed.

Referring to FIG. 7, the conventional antenna pattern manufacturing method forms through holes 16 that form the line spacing of the antenna pattern 100 in the metal sheet 10 through one-time etching. In this case, due to the limitations of etching technology, the width W1 of the through hole 16 increases in proportion to the thickness T of the metal sheet 10, and the width W1 of the through hole 16 formed through the conventional etching process is That is, the line spacing of the antenna pattern 100 is formed to be about twice (200%) the thickness (T) of the metal sheet 110.

That is, if the thickness T of the metal sheet 10 (antenna pattern 100) is about 2 oz (approximately 70 um), the width W1 of the through hole 16 formed by the conventional antenna pattern manufacturing method, that is, the antenna The line spacing or line width of the pattern 100 is formed to be approximately 140 um.

If the thickness T of the metal sheet 10 (antenna pattern 100) is about 3 oz (approximately 105 um), the width W1 of the through hole 16 formed by the conventional antenna pattern manufacturing method, that is, the antenna pattern ( The line spacing or line width of 100) is formed to be approximately 210um.

On the other hand, the antenna pattern manufacturing method according to an embodiment of the present invention involves an etching process in two steps (i.e., a first half groove forming step (S130) and a second half groove forming step (S170) to form the through hole 116. )), the width of the through hole 116 formed in the metal sheet 110 (i.e., the line spacing or line width of the antenna pattern 100) can be formed to be less than or equal to the thickness of the metal sheet 110.

At this time, the width of the through hole 116 (i.e., the line spacing or line width of the antenna pattern 100) may be formed to be about 80% to 120% of the thickness of the metal sheet 110, including errors during the manufacturing process.

For example, referring to FIG. 8, if the thickness T of the metal sheet 110 (i.e., the antenna pattern 100) is about 2oz (approximately 70um), it is formed by the antenna pattern manufacturing method according to an embodiment of the present invention. The width (W2, that is, the line spacing or line width of the antenna pattern 100) of the through hole 116 is formed to be approximately 70 um.

If the thickness (T) of the metal sheet 110 (i.e., the antenna pattern 100) is about 3 oz (approximately 105 um), the width (W2, i.e., the antenna) of the through hole 116 formed by the conventional antenna pattern manufacturing method is The line spacing or line width of the pattern 100 is formed to be approximately 100 um.

As such, the method of manufacturing an antenna pattern according to an embodiment of the present invention divides the etching process into two steps (i.e., the first half-groove forming step (S130) and the second half-groove forming step (S170)), thereby replacing the conventional antenna. Compared to the pattern manufacturing method, the width of the through hole 116 formed in the metal sheet 110 (i.e., the line spacing or line width of the antenna pattern 100) can be reduced by about 50%.

In addition, the antenna pattern manufacturing method according to an embodiment of the present invention reduces the width of the through hole 116 (i.e., the line spacing or line width of the antenna pattern 100) by about 50% compared to the prior art, thereby reducing the thickness to 3oz (105um). ) or more, there is an effect of producing an antenna pattern 100 with a line spacing (pitch) of 100 um or less.

In addition, the antenna pattern manufacturing method enables the manufacturing of the antenna pattern 100 with a line spacing of approximately 80% to 120% of the metal thickness, thereby increasing design freedom and enabling performance-optimized design.

In the surface treatment step (S180), the first side of the metal sheet 110 is surface treated. In the surface treatment step (S180), an organic material is applied through an Organic Solderability Preservative (OSP) process to form a rust prevention film 118 on the first side of the metal sheet 110. Through this, the first surface of the metal sheet 110 is flattened and air is blocked from contact with the metal sheet 110 to prevent oxidation of the metal sheet 110 (that is, the antenna pattern 100).

In the surface treatment step (S180), a plating layer may be formed by plating tin (Sn) or nickel (Ni) on the first side of the metal sheet 110 in order to prevent oxidation of the metal sheet 110 along with the OSP process.

In the stamping step (S190), an outline of the antenna pattern 100 is formed on the metal sheet 110 through a stamping process. In the stamping step (S190), the metal sheet 110 is stamped using the stamping device 200 to form an outline of the antenna pattern 100.

Through the above-described process, the antenna pattern manufacturing method according to an embodiment of the present invention can manufacture the antenna pattern 100 having a line spacing of 80% or more and 120% or less of the thickness of the metal sheet 110. The antenna pattern 100 manufactured through the above-described process is used as an antenna for wireless power transmission/reception (WPC; Wireless Power Consortium), near field communication (NFC; Near Field Communication), electronic payment (MST; Magnetic Secure Transmission), etc. It can work.

The above description is merely an illustrative explanation of the technical idea of the present invention, and various modifications and variations will be possible to those skilled in the art without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

Claims

laminating a carrier sheet to the first side of the metal sheet;

exposing a second side of the metal sheet opposite the first side to light;

Half-etching the second side of the metal sheet to form a first half groove dug in the inner direction of the metal sheet on the second side of the metal sheet;

laminating a coverlay sheet to a second side of the metal sheet on which the first half groove is formed;

removing the carrier sheet laminated to the first side of the metal sheet;

exposing a first side of the metal sheet from which the carrier sheet has been removed; and

An antenna pattern manufacturing method comprising the step of half-etching the first side of the metal sheet to form a second half groove dug from the first side of the metal sheet toward the inside of the metal sheet.
According to paragraph 1,

In the step of forming the second half groove, the antenna pattern manufacturing method includes forming the second half groove so that at least a portion overlaps the first half groove.
According to paragraph 2,

The first half groove and the second half groove form a through hole penetrating the first and second surfaces of the metal sheet.
According to paragraph 3,

The through hole forms a line spacing of the antenna pattern, and the line spacing of the antenna pattern is equal to the thickness of the metal sheet.
According to paragraph 3,

An antenna pattern manufacturing method wherein the width of the through hole is less than or equal to the thickness of the metal sheet.
According to paragraph 3,

A method of manufacturing an antenna pattern wherein the width of the through hole is 80% to 120% of the thickness of the metal sheet.
According to paragraph 1,

In forming the first half groove, a first half groove having a first central axis vertically penetrating the first and second surfaces of the metal sheet is formed,

In the step of forming the second half groove, a second half groove having a second central axis vertically penetrating the first and second surfaces of the metal sheet is formed,

The first central axis and the second central axis are spaced apart from each other.
According to paragraph 1,

In forming the first half groove, a first half groove having a first central axis vertically penetrating the first and second surfaces of the metal sheet is formed,

In the step of forming the second half groove, a second half groove having a second central axis vertically penetrating the first and second surfaces of the metal sheet is formed,

The first central axis and the second central axis are disposed on the same line.
According to paragraph 1,

The metal sheet is a plate-shaped substrate having a set thickness,

A method of manufacturing an antenna pattern where the set thickness is 70um or more.
According to paragraph 1,

Further comprising surface treating the first side of the metal sheet on which the second half groove is formed,

An antenna pattern manufacturing method in which, in the surface treatment step, a rust-prevention film is formed on the first side of the metal sheet.
According to paragraph 1,

An antenna pattern manufacturing method further comprising forming an outline of the antenna pattern by stamping the metal sheet on which the second half groove is formed.