WO2018038571A1

WO2018038571A1 - Method for manufacturing cover for fingerprint sensor

Info

Publication number: WO2018038571A1
Application number: PCT/KR2017/009308
Authority: WO
Inventors: 조성호; 오창우; 안영준
Original assignee: 주식회사 아모센스
Priority date: 2016-08-26
Filing date: 2017-08-25
Publication date: 2018-03-01

Abstract

A method for manufacturing a cover for a fingerprint sensor is provided. The method for manufacturing a cover for a fingerprint sensor, according to one exemplary embodiment of the present invention, comprises: a step for preparing a ceramic green sheet by applying a ceramic slurry onto a substrate; a shape machining step for machining so as to form a predetermined shape by first cutting a partial thickness of the entire thickness of the ceramic green sheet by means of stamping; and a step for heat treating and sintering the ceramic green sheet.

Description

Manufacturing method of cover for fingerprint sensor

The present invention relates to a method of manufacturing a cover for a fingerprint sensor.

The fingerprint sensor is a sensor for detecting a human finger fingerprint, and has recently been widely used as a means for enhancing security in portable electronic devices such as mobile phones and tablet PCs. In other words, by registering or authenticating through a fingerprint sensor, data stored in portable electronic devices are protected and security accidents are prevented.

For example, when the fingerprint sensor is applied to the home button side of the mobile phone, the fingerprint sensor is inserted into the receiving part formed on the bezel of the mobile phone and is prevented from being exposed to the outside through a cover covering the receiving part.

Such a cover employs a ceramic material having excellent hardness, such as sapphire crystal or zirconia, to prevent damage due to scratches and increase the recognition rate of the fingerprint sensor. However, the ceramic material is excellent in hardness and effective in preventing scratches, but it is weak in impact due to strong brittleness due to the sintering process through heat treatment.

Accordingly, the cover made of a ceramic material is very difficult to process into various shapes through the punching. In particular, when the cover is a shape having a curved surface, such as oval or circular, the punching process is impossible, it is generally processed through laser processing. As a result, there is a problem that the production yield is lowered and the production cost is increased.

On the other hand, when the cover is made of a ceramic material such as sapphire crystal or zirconia, the material itself is a transparent color, so the aesthetics may be deteriorated when the color of the peripheral parts such as the bezel is colored.

Accordingly, by applying a colored paint of a color similar to a bezel as a peripheral part on one surface of the cover, the fingerprint sensor built into the main body of the portable device is prevented from shining through the cover and the deterioration of aesthetics is prevented.

Such coating is generally performed through the silk screen method. However, there is a limit to additionally perform the silkscreen process to form a colored paint on one side of the cover.

The present invention has been made in view of the above, the present invention is to provide a method of manufacturing a cover for a fingerprint sensor for easy processing to a variety of shapes by the shape processing is made before the final sintering.

In addition, another object of the present invention is to provide a method of manufacturing a cover for a fingerprint sensor which can realize a color similar to a peripheral part without performing a separate process such as a silk screen because the ceramic green sheet includes a colored pigment. .

In order to solve the above problems, the present invention is a manufacturing method of a cover disposed in front of the fingerprint sensor in contact with the user's finger, comprising: preparing a ceramic green sheet by applying a ceramic slurry on the substrate; A shape processing step of first cutting a part of the total thickness of the ceramic green sheet by a punching process to have a predetermined shape; And sintering the ceramic green sheet by heat treatment.

In addition, the second step of the heat-treated ceramic green sheet to separate the individual; may include.

In addition, the second step of separating the ceramic green sheet by separating the individual; may be performed for the remaining thickness except the first cut portion of the total thickness of the ceramic green sheet.

The method may further include forming an anti-fingerprint layer on one surface of the heat treated ceramic green sheet.

In addition, the individual may have a shape in which at least a part of the entire frame includes a curve.

In addition, the ceramic green sheet may be a ceramic sheet including at least one of zirconia, alumina, TiC, TiN, and TiCN.

In addition, the ceramic slurry may include a colored pigment. For example, the colored pigment may be any one of white, gold, black, gray, silver, blue, pink, brown, green, yellow, and red.

In addition, the ceramic green sheet may be a single layer sheet containing a colored pigment, or may be a multi-layered sheet in which a plurality of sheets having different colors are stacked in multiple layers.

In addition, when the ceramic green sheet is a multi-layered sheet, pressing the multi-layered sheet may be further included. When the ceramic green sheet is a multi-layered sheet, the plurality of sheets may be formed of the same material.

On the other hand, the present invention is another method of manufacturing a cover disposed in front of the fingerprint sensor in contact with the user's finger, comprising: preparing a ceramic green sheet by applying a ceramic slurry on the substrate; Punching an individual having a predetermined shape from the ceramic green sheet; And sintering the individual by heat treatment.

In addition, the present invention is another method of manufacturing a cover disposed in front of the fingerprint sensor in contact with the user's finger, comprising the steps of: applying a ceramic slurry on the substrate to produce a ceramic green sheet; Sintering the ceramic green sheet at a first temperature to form an intermediate sintered body; Separating the intermediate sintered body into individual bodies having a predetermined shape; And heat-treating the individual at a second temperature relatively higher than the first temperature to sinter secondary.

At this time, the first temperature may be 500 ~ 700 ℃, the second temperature may be 1000 ~ 1400 ℃.

According to the present invention, it is possible to implement all the various processing methods including the punching process, while having a variety of shapes, there is an advantage of lowering the production cost and increasing productivity. In particular, even if the edge of the cover includes a curved surface, all of the various shape processing methods can be applied.

In addition, the present invention can simplify the production process because the ceramic slurry constituting the ceramic green sheet can be omitted, such as a silk screen for imparting color by including a colored pigment.

In addition, the present invention has the advantage that the surface of the cover is formed by the cutting surface by the punching process has an excellent surface roughness compared to the laser processing, if the side of the cover is cut in two times before and after sintering have a different surface roughness Can be.

1 is a block diagram showing a manufacturing method of a cover for a fingerprint recognition sensor according to a first embodiment of the present invention,

2 is a process flowchart showing a manufacturing method of a cover for a fingerprint sensor according to a first embodiment of the present invention;

3 is a schematic view for explaining a first region and a second region formed on the side of the ceramic element in the manufacturing method of the fingerprint sensor cover according to the first embodiment of the present invention;

Figure 4 is a block diagram showing a manufacturing method of the cover for the fingerprint sensor according to a second embodiment of the present invention,

5 is a process flowchart showing a manufacturing method of a cover for a fingerprint recognition sensor according to a second embodiment of the present invention;

6 is a block diagram showing a method of manufacturing a cover for a fingerprint recognition sensor according to a first embodiment of the present invention;

7 is a process flowchart showing the manufacturing method of the cover for the fingerprint sensor according to the first embodiment of the present invention,

8 is a diagram illustrating various cases in which the ceramic body of the cover manufactured by the manufacturing method according to the present invention is a single layer and a multilayer case;

9 is an exemplary view showing various shapes of a cover manufactured by the manufacturing method according to the present invention, and

10 is a view showing a state in which a cover manufactured by the manufacturing method according to the present invention is applied to a portable device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification.

- - 제1실시예First embodiment - -

Method of manufacturing a cover 100 for a fingerprint sensor according to an embodiment of the present invention is to prepare a ceramic green sheet (S11), shape processing step (S12) and sintering as shown in Figures 1 and 2 Step S13 may be included.

The step (S11) of manufacturing the ceramic green sheet is to form a plate-shaped ceramic green sheet 12 having a predetermined area and thickness by applying and drying a ceramic slurry on the substrate 11 (FIG. a).

For example, the ceramic green sheet 12 may be prepared by mixing a fine ceramic powder with an aqueous or non-aqueous solvent and a binder, a plasticizer, a dispersant, an antifoaming agent, a surfactant, and the like in an appropriate ratio to prepare a ceramic slurry on the substrate 11. The ceramic slurry may be manufactured through a tape casting method of applying a predetermined thickness.

At this time, the ceramic green sheet 12 may be implemented as a single-layered sheet, but may be implemented as a single-layer ceramic body 110, but a plurality of sheets are formed as a multilayered sheet laminated in multiple layers to implement a multilayer ceramic body 110. May be (see FIG. 8). In addition, when the ceramic green sheet 12 is formed of a multilayer sheet, the interface between the sheets may be flattened by pressing through a separate pressing process (S11 ′). Through this, it is possible to prevent a variety of problems such as peeling between layers in the subsequent process.

Here, when the ceramic green sheet 12 is formed of a multilayer sheet, each sheet may be made of the same material or may be made of different materials.

In addition, the ceramic powder may include any one selected from the group consisting of zirconia, alumina, TiC, TIN, TiCN, and combinations thereof, but is not limited thereto, and any ceramic powder may be used. To reveal.

Accordingly, the fingerprint recognition sensor cover 100 manufactured according to the present embodiment may have a predetermined dielectric constant by being made of the ceramic body 110 in which the ceramic green sheet 12 is sintered. For this reason, when the cover 100 for the fingerprint recognition sensor is disposed in the front side of the fingerprint recognition sensor 20 in a product such as a portable electronic device, a driving signal generated by the fingerprint recognition sensor 20 may cause a user's finger. By condensing the electric force lines directed toward the fingerprint recognition sensor 20, the recognition rate and accuracy of the fingerprint recognition sensor 20 may be improved.

The shape processing step S12 is a step of processing a shape substantially the same as that of the final product 100 from the ceramic green sheet 12, and may be performed before sintering the ceramic green sheet 12.

That is, by cutting the ceramic green sheet 12 in a flexible state before sintering, the upper side surface of the ceramic body 110 constituting the cover 100 as a final product may be formed.

For example, the shape processing step S12 may be performed through a punching process using a mold, and may be performed only for a thickness t1 of a part of the total thickness t of the ceramic green sheet 12. Specifically, the shape processing step (S12) is the blade of the mold having the same shape as the edge of the cover 100 of the final product is inserted into the ceramic green sheet 12 by a predetermined depth from the upper surface of the ceramic green sheet 12 Only a part of the thickness t1 of the total thickness t can be cut (see Fig. 2B). Through this, the plurality of temporary separators 13 having the same shape as the cover 100 as the final product may be formed on the ceramic green sheet 12 side.

In this state, when the ceramic green sheet 12 is sintered through heat treatment, a plurality of temporary separators 13 having a predetermined shape may be cured in an array in one ceramic green sheet 12 (FIG. 2 (c)), by temporarily cutting the temporary separator 13 from the cured ceramic green sheet 12 and separating it into individual pieces, a cover 100 as a final product may be manufactured (see FIG. d)).

At this time, the secondary cutting process (S15) for separating the individual from the ceramic green sheet 12 to each individual process is produced in a semi-finished state in which a plurality of temporary separators 13 are arranged and then applied to an application such as a portable device It may be made in, or may be performed in a subsequent process after the sintering is completed.

Here, the second cutting portion of the temporary separator 13 may be performed on the remaining thickness t2 except the first cut thickness t1 of the total thickness t of the ceramic green sheet 12.

Accordingly, the individual body completely separated from each of the ceramic green sheets 12 through the secondary cutting process, as shown in FIG. 3, has a lower side formed through the secondary cutting as shown in FIG. 3. It may have different surface roughness from the side.

Specifically, the individual body may have the same shape as the cover 100 for the fingerprint sensor, which is a final product, and may be divided into a first area A1 and a second area A2 having a predetermined area having a cut surface. The surface roughness of the first region A1 and the surface roughness of the second region A2 may have different surface roughnesses (see FIG. 3).

Here, the sum of the area corresponding to the first area A1 and the area corresponding to the second area A2 may be the total area of one side of the individual body. In addition, the first area A1 and the second area A2 may be distinguished from each other by a virtual straight line L formed along the side surface of the individual in the middle of the height or the thickness of the individual. Accordingly, the first region A1 may form an upper side surface of the individual body or the ceramic body 110, and the second region A2 may form a lower side surface of the individual body or the ceramic body 110. have.

In this case, the width or thickness t1 of the first region A1 may have the same size as or different from the width or thickness t2 of the second region A2. In addition, an imaginary straight line L separating the first area A1 and the second area A2 may be formed along the middle of the height or the middle of the thickness of the sheet constituting the individual body or the ceramic body 110. have. In addition, when the individual is composed of a plurality of sheets stacked on each other may be formed to match the boundary between the sheets.

As described above, in the manufacturing method according to the exemplary embodiment of the present invention, the process of processing the shape to have a shape substantially the same as that of the cover 100, which is the final product, may be performed at the previous stage of the sintering process, thereby increasing the ease of processing.

In addition, the cover 100 for the fingerprint recognition sensor, which is a final product, is formed by cutting the ceramic green sheet 12 in a flexible state before sintering to form an upper side of the ceramic element 110, so that the upper side is sintered. It may have a relatively small surface roughness compared to the lower side surface is a cutting surface formed by the secondary cutting in the completed state.

In addition, since the sintering process is performed after being processed into the temporary separator 13 having a relatively narrow area relative to the total area of the ceramic green sheet 12, deformation and deformation of the camber in the edge portion during the sintering process are generated. It can be minimized.

Furthermore, in the present embodiment, since the shape processing is performed in a flexible state before sintering, all kinds of well-known shape processing including punching can be applied, thereby increasing productivity, and processing into various shapes can be performed without limiting the shape. Can be. For example, the temporary separator 13 may have a shape in which at least a part of the edge of the entire border includes a curve, such as a polygonal shape such as a triangular shape or a square shape, as well as a polygonal shape that is round, elliptical, or a corner processed by a curve. (See FIG. 9).

On the other hand, the manufacturing method according to an embodiment of the present invention includes the step of forming an anti-fingerprint layer 120 for preventing slip and scratches on one surface of the ceramic green sheet 12, the sintering process is completed (S14) Can be.

In addition, by processing at least one of the upper and lower surfaces of the sintered ceramic green sheet 12 to eliminate the defects generated during the sintering process or to increase the flatness to perform a separate surface polishing process to eliminate the thickness deviation It may be.

The surface polishing process may be performed by at least one of a known lapping process or a polishing process, and any one of two processes may be selectively performed according to the state of the ceramic green sheet 12 which has been sintered. It may also be performed.

- - 제2실시예Second embodiment - -

On the other hand, the manufacturing method of the cover for the fingerprint sensor according to another embodiment of the present invention is to produce a ceramic green sheet (S21), forming an individual (S22), as shown in Figure 4 and 5, It may include the step of sintering (S23) and the step of polishing (S24).

The step (S21) of manufacturing the ceramic green sheet is to form a plate-shaped ceramic green sheet 12 having a predetermined area and thickness by applying and drying a ceramic slurry on the substrate 11 (FIG. 5 ( a).

At this time, the ceramic green sheet 12 may be implemented as a single-layered sheet, but may be implemented as a single-layer ceramic body 110, but a plurality of sheets are formed as a multilayered sheet laminated in multiple layers to implement a multilayer ceramic body 110. May be (see FIG. 8). In addition, when the ceramic green sheet 12 is composed of a multilayer sheet, the interface between the sheets may be flattened by pressing through a separate pressing process. Through this, it is possible to prevent a variety of problems such as peeling between layers in the subsequent process.

Forming the individual (S22) may be a step of processing from the ceramic green sheet 12 to the individual body 14 having substantially the same shape and size as the final cover 100, the individual body Sintering step (S22) may be a step of curing by applying heat to the individual body 14 having a predetermined size and shape.

At this time, in this embodiment, the process of processing the shape so as to have a shape substantially the same as the cover 100, which is the final product can be made in the previous step of the sintering process can increase the ease of processing.

Conventionally, the same shape processing as the cover was performed after sintering the green sheet. As a result, the brittleness of the green sheet due to hardening was increased during sintering, so that shape processing by punching was impossible, and in order to minimize damage to the sheet itself, shape processing was possible only through limited processing methods such as laser processing. With the increase, productivity declined.

However, in the manufacturing method of the present embodiment, after the ceramic green sheet 12 is manufactured and before the sintering process, the individual body 14 having the same shape as the shape of the cover 100 which is the final product from the ceramic green sheet 12 is formed. By processing with a metal mold | die, all well-known various shape processing methods including the punching method using a metal mold | die can be applied (refer FIG. 5 (b) (c)).

Accordingly, in the present embodiment, even when the punching method is used, the individual body 14 can be processed into various shapes desired. For example, the individual body 14 may have a shape in which a border of at least a part of the entire border includes a curve, such as a polygonal shape such as a triangular shape or a square shape, as well as a circular shape, an oval shape, or a polygonal shape whose corners are curved. (See FIG. 9).

In addition, the manufacturing method of the present embodiment is less brittle than the sheet which has been sintered even when processed in the form of the final product through punching, and can not only prevent damage to the sheet itself by impact during processing, but also productivity compared to laser processing. Can dramatically increase.

In addition, by changing the individual body 14 from the laser cutting method to the punching method, the side surface of the cover 100, which is a cutting surface, may have a surface roughness that is relatively superior to that of the cutting surface by laser cutting.

In addition, since the sintering process is performed after being processed into an individual body 14 having a relatively narrow area compared to the total area of the ceramic green sheet 12, deformation due to shrinkage during the sintering process and generation of camber at the edge portion It can be minimized.

Accordingly, the amount of work can be reduced and the processing time can be reduced during post-processing, such as a lapping process or a polishing process for processing the surface of the sintered individual 14.

Grinding the individual body 14 (S24) is generated from the sintering process by processing at least one surface of the upper and lower surfaces of the individual body 14 after the sintering is completed after being punched out of the ceramic green sheet 12 It is a process for eliminating defects, increasing flatness and eliminating thickness deviation (see FIG. 5D).

Such a polishing process may be performed through at least one of a known lapping process or a polishing process, and any one of two processes may be selectively performed according to the state of the individual body 14 that has been sintered. It may be.

On the other hand, the manufacturing method according to the present embodiment may include the step (S25) of forming a fingerprint prevention layer 120 for preventing slip and scratch on one surface of the individual body 14, the polishing process is completed (Fig. (E) of 5).

In this case, one surface on which the anti-fingerprint layer 120 is formed may be one surface exposed to the outside, and when the individual body 14 is formed of a multi-layered sheet having different colors, it may be formed on both top and bottom surfaces. Can be.

Here, the anti-fingerprint layer 120 may be a known anti-fingerprinting (AF) coating layer for preventing the occurrence of scratches and fingerprints. For example, the anti-fingerprint layer 120 may be a fluorine-based or silicon-based to have anti-fingerprint and antifouling properties.

- - 제3실시예Third embodiment - -

On the other hand, the manufacturing method of the cover for the fingerprint sensor in accordance with another embodiment of the present invention to prepare a ceramic green sheet 12 as shown in Figure 6 and 7 (S31), the first sintering step (S32) ), May be separated into individual (S33) and the second sintering step (S34).

The step (S31) of manufacturing the ceramic green sheet is to form a plate-shaped ceramic green sheet 12 having a predetermined area and thickness by applying and drying a ceramic slurry on the substrate 11 (FIG. 7 ( a)).

At this time, the ceramic green sheet 12 may be implemented as a single-layered sheet, but may be implemented as a single-layer ceramic body 110, but a plurality of sheets are formed as a multilayered sheet laminated in multiple layers to implement a multilayer ceramic body 110. May be (see FIG. 8). In addition, when the ceramic green sheet 12 is formed of a multi-layer sheet, by pressing through a separate pressing process (S31 '), the interface between the ceramic green sheets 12 is flattened, such as peeling between layers in a subsequent process. It can prevent problems from occurring. Here, when the ceramic green sheet 12 is formed of a multilayer sheet, each of the

sheets

111, 112, and 113 may be made of the same material or may be made of different materials.

The first sintering step (S32) is to form an intermediate sintered body by applying heat to the ceramic green sheet 12. That is, in the first sintering step S32, heat may be applied to the ceramic green sheet 12 to change the ceramic green sheet 12 into an intermediate sintered body in a temporary curing state.

This is to harden the ceramic green sheet 12 in a flexible state through primary sintering so that a cutting operation for processing into the same shape as the cover 100 for the fingerprint sensor, which is the final product, can be easily performed. . In addition, the secondary sintering step (S34) to be performed after the removal of the binder or air, including the solvent, binder, dispersant, etc. included in the ceramic green sheet 12 by the heat applied in the first sintering step (S32). The amount of deformation and distortion due to shrinkage and distortion of the ceramic green sheet 12 can be reduced.

To this end, the first sintering step (S32) may be performed for a sufficient time at a temperature relatively lower than the temperature performed in the second sintering step (S34).

For example, the first sintering step (S32) may be performed at a first temperature that is a temperature range of 500 ~ 700 ℃, the second sintering step (S34) at a second temperature of a temperature range of 1000 ~ 1400 ℃. Can be performed. However, the first temperature and the second temperature are not limited thereto, and the temperature ranges applied in the first sintering step S32 and the second sintering step S34 may be appropriately changed according to the type of ceramic powder. However, if the first temperature applied in the first sintering step (S32) is relatively low temperature than the second temperature applied in the second sintering step (S34) it will be clear.

The shape processing step (S33) is a step of processing to have a shape substantially the same as the cover 100 for the fingerprint sensor, which is the final product, by cutting the ceramic green sheet 12 in the intermediate sintered state through the first sintering the ceramic green A plurality of individual bodies 14 can be separated from the sheet 12 (see FIGS. 7B and 7C).

That is, in the manufacturing method according to the present embodiment, the same shape processing as the cover 100 for the fingerprint sensor, which is the final product, is performed in the intermediate sintered state in which the ceramic green sheet 12 is cured through primary sintering, thereby providing sufficient mechanical processing for cutting. Since brittleness is weak while having strength, no breakage or cracking occurs due to external force applied during cutting.

As a result, all known cutting processes such as laser machining and punching using a mold can be applied, and productivity can be increased by 20 times faster than cutting the sintered ceramic sintered body in a high density state. It can increase the production cost.

In addition, the manufacturing method according to the present embodiment is carried out before the second sintering step of sintering to a high density ceramic state to process the shape to have a shape substantially the same shape as the cover 100 for the fingerprint sensor is a final product to increase the ease of processing Can be. That is, it is possible to increase the productivity by being able to form or cut a variety of known methods, including punching, and because the various known cutting process is possible it can be processed into a variety of shapes.

For example, the individual body 15 may have a shape in which a border of at least a part of the entire border includes a curve, such as a polygonal shape such as a triangular shape or a square shape, as well as a circular shape, an oval shape, or a polygonal shape whose edge is curved. (See FIG. 9).

The secondary sintering step (S34) is a process for forming a high-density ceramic sintered body by heating (sintering) the individual body 15 separated from the ceramic green sheet 12 again. As described above, the secondary sintering step S34 may be performed at a relatively higher temperature than the primary sintering step S32, so that the individual body 15 may be sufficiently sintered to a high density to a density of 90% or more. have.

At this time, the manufacturing method according to the present embodiment is processed into an individual body 15 having a relatively narrow area compared to the total area of the ceramic green sheet 12, so that the secondary sintering process is performed, each individual body ( 15) can minimize deformation or warpage due to shrinkage and camber generation at edges during secondary sintering. Accordingly, it is possible to reduce the amount of work and reduce the processing time during post-processing, such as a lapping process or a polishing process for processing the surface of the sintered individual 15 is completed.

On the other hand, the manufacturing method according to the present embodiment to remove at least one surface of the upper surface and the lower surface of the individual body 15, the secondary sintering is completed to eliminate the defects generated during the sintering process or to increase the flatness to eliminate the thickness deviation A separate surface polishing step S35 may be performed (see FIG. 7D).

The surface polishing step (S35) may be performed through at least one of a known lapping process or a polishing process, and any one of two processes may be performed depending on a state of the sintered individual 15. It may optionally be performed.

In addition, the manufacturing method according to the present embodiment may further comprise the step (S36) of forming an anti-fingerprint layer 120 for preventing slip and scratches on one surface of the individual body 15, the secondary sintering is completed. (See FIG. 7E).

In this case, one surface on which the anti-fingerprint layer 120 is formed may be one surface exposed to the outside. When the individual body 15 is implemented through a multi-layered green sheet having different colors, the upper surface and the lower surface may be formed on both sides. All may be formed.

Meanwhile, the ceramic green sheet 12 mentioned in the above embodiments may have at least one color. To this end, the ceramic slurry may include a colored pigment so that the ceramic green sheet 12 may have a desired color. That is, the cover 100 for the fingerprint sensor, which is the final product, may have at least one color by including an appropriate amount of colored pigment in the process of manufacturing the ceramic slurry.

Here, the colored pigment may be any one of white, gold, black, gray, silver, blue, pink, brown, green, yellow, and red, and the same or similar color as the bezel 10 of the portable electronic device. Can be.

Accordingly, since the ceramic green sheet 12 used in the manufacturing method according to the present invention has a translucent or opaque state in which colored pigments are added, the conventional method of forming a colored coating layer through a silk screen process on one surface of the cover is performed. In comparison, the production process can be simplified and the production cost can be reduced.

In this case, the ceramic green sheet may be a single layer having one color or a multilayer sheet in which a plurality of sheets having the same color are stacked, or may be a multilayer sheet in which a plurality of sheets having different colors are stacked.

For example, when the pigment included in the ceramic slurry is an opaque color other than a white color such as gold, black, gray, silver, blue, pink, brown, green, yellow, red, etc., the ceramic green sheet is a single layer of green. The sheet may be used or a plurality of green sheets having the same color may be stacked in multiple layers.

As another example, when the pigment included in the ceramic slurry is a white color, the ceramic green sheet may have a first sheet 111 having a white color and a second sheet having a remaining color except for the white color. 112 may be implemented as a laminated multilayer sheet. In this case, the ceramic green sheet may have a two-layer structure in which one first sheet 111 and one second sheet 112 are stacked, and among the first sheet 111 and the second sheet 112. At least one green sheet may be provided in plural and stacked in three or more layers, or three or more green sheets having different colors may be stacked. In addition, the ceramic green sheet may be implemented as a multilayer sheet in which at least two green sheets having different colors except white are stacked.

As such, the cover 100 for the fingerprint sensor manufactured by the manufacturing method according to the present invention may have the same or similar color as that of the bezel 10 through the colored pigment added to the ceramic slurry. Through this, even if the cover 100 is exposed to the outside together with the bezel 10 can increase the unity of the overall color of the portable electronic device can be prevented from impairing the aesthetics.

In addition, the fingerprint sensor cover 100 manufactured by the manufacturing method according to the present invention can be implemented in a translucent or opaque state through the colored pigment added to the ceramic slurry, the fingerprint sensor cover 100 Compared to the conventional method of forming a colored coating layer through the silk screen process on one side, the production process can be simplified and the production cost can be reduced.

In addition, when the cover 100 for the fingerprint sensor manufactured by the manufacturing method according to the present invention is implemented through the ceramic green sheet of the multilayer sheet in which the ceramic body 110 is laminated with at least two sheets having different colors. One fingerprint sensor 100 for the final product may also be implemented to have two colors. By doing so, in the process of applying the fingerprint recognition sensor cover 100 to the portable electronic device, any one of two colors may be installed to be exposed to the outside. Accordingly, the bezel 10 may be selectively applied to two portable electronic devices having different colors of the bezel 10 through one cover for fingerprint recognition sensor, thereby improving compatibility.

The fingerprint recognition sensor cover 100 manufactured by the above-described manufacturing method is disposed at the front side of the fingerprint recognition sensor 20 embedded in the portable electronic device as shown in FIG. 10 and the fingerprint recognition sensor 20. It may be fixed via the adhesive member 30, and may serve as a button (for example, a home button) that is an input means of a portable electronic device.

In addition, the overall thickness of the cover 100 for the fingerprint recognition sensor manufactured by the above-described manufacturing method may have a thickness of 100 ~ 150㎛, but the overall thickness is not limited to this and varies depending on the design conditions and application location Note that it may change.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments set forth herein, and those skilled in the art who understand the spirit of the present invention, within the scope of the same idea, the addition of components Other embodiments may be easily proposed by changing, deleting, adding, and the like, but this will also fall within the spirit of the present invention.

Claims

As a manufacturing method of the cover disposed in front of the fingerprint sensor in contact with the user's finger,

Preparing a ceramic green sheet by applying a ceramic slurry on a substrate;

A shape processing step of first cutting a part of the total thickness of the ceramic green sheet by a punching process to have a predetermined shape; And

Heat treating the ceramic green sheet and sintering the manufacturing method of the cover for a fingerprint sensor.
The method of claim 1,

And secondly cutting the heat-treated ceramic green sheet to separate them into individual bodies.
The method of claim 2,

Separating the ceramic green sheet by separating the ceramic sheet into individual pieces; the manufacturing method of the cover for the fingerprint recognition sensor performed for the remaining thickness except the first cut portion of the total thickness of the ceramic green sheet.
The method of claim 1,

Forming a fingerprint layer on one surface of the ceramic green sheet; Method of manufacturing a cover for a fingerprint sensor further comprising.
The method of claim 2,

The individual body is a method of manufacturing a cover for a fingerprint sensor, wherein at least a part of the entire frame comprises a curve.
The method of claim 1,

The ceramic green sheet is a ceramic sheet containing a ceramic sheet containing at least one of zirconia, alumina, TiC, TiN and TiCN.
The method of claim 1,

The ceramic slurry is a method of manufacturing a cover for a fingerprint sensor containing a colored pigment.
The method of claim 7, wherein

The colored pigment is a method of manufacturing a cover for a fingerprint sensor having a color of any one of white, gold, black, gray, silver, blue, pink, brown, green, yellow and red.
The method of claim 1,

The ceramic green sheet is a single layer sheet containing colored pigments, or a method for manufacturing a cover for a fingerprint sensor, wherein the plurality of sheets having different colors are stacked in multiple layers.
The method of claim 9,

And pressing the multilayer sheet when the ceramic green sheet is a multilayer sheet.
The method of claim 9,

If the ceramic green sheet is a multi-layer sheet, the plurality of sheets are made of the same material manufacturing method of the cover for the fingerprint sensor.
As a manufacturing method of the cover disposed in front of the fingerprint sensor in contact with the user's finger,

Preparing a ceramic green sheet by applying a ceramic slurry on a substrate;

Punching an individual having a predetermined shape from the ceramic green sheet; And

And heat treating the individual body to sinter the cover.
Preparing a ceramic green sheet by applying a ceramic slurry on a substrate;

Sintering the ceramic green sheet at a first temperature to form an intermediate sintered body;

Separating the intermediate sintered body into individual bodies having a predetermined shape; And

Heat treating the individual at a second temperature that is relatively higher than the first temperature to sinter secondary.
The method of claim 13,

The first temperature is 500 ~ 700 ℃, the second temperature is 1000 ~ 1400 ℃ manufacturing method of the cover for the fingerprint sensor.