KR101604749B1 - Portable terminal and manufacturing method of portable terminal case - Google Patents

Abstract

The present invention relates to an electronic device including a case forming an external appearance of a terminal body, and electronic parts embedded in the case, the case including a base layer, a light emitting element disposed inside the base layer, And a light guide plate disposed inside the base layer so as to be positioned behind the light transmitting film and guiding the light emitted from the light emitting element to the light transmitting film, the light transmitting film being formed on the outer surface of the base layer A terminal and a case for a mobile terminal applied thereto are disclosed.

Description

TECHNICAL FIELD [0001] The present invention relates to a portable terminal and a portable terminal,

The present invention relates to a portable terminal and a method of manufacturing a case to which a case capable of implementing a lighting effect is applied.

A portable terminal is a portable device that is portable and has one or more functions such as voice and video call function, information input / output function, and data storing function.

As the functions of the portable terminal are diversified, for example, the portable terminal has complicated functions such as photographing and photographing of a moving picture, reproduction of music or video file, reception of a game and broadcasting, and is implemented as a multimedia device .

In order to implement complex functions in multimedia devices, various new attempts have been made in terms of hardware or software. For example, a user interface environment is provided for a user to easily and conveniently search for or select a function.

In addition, a portable terminal is regarded as a personal portable product for expressing its own personality, and various designs are required. In recent years, as a structure for implementing a lighting effect on a case in a portable terminal, information is provided to a user or an aesthetic effect is provided.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a case lighting structure capable of realizing a slim thickness and a bright lighting effect.

According to an aspect of the present invention, there is provided an electronic device including a case for forming an external appearance of a terminal body, and electronic parts embedded in the case, the case including a base layer, And a light guide plate disposed inside the base layer so as to be positioned behind the light transmissive film and guiding light emitted from the light emitting element to the light transmissive film, And a portable terminal.

The base layer may be formed of a synthetic resin material and may be fused to the light transmitting film and the light guide plate.

The base layer may be formed by insert injection molding in which the light transmissive film and the light guide plate are inserted into the injection mold.

The light emitting device may be disposed adjacent to one end of the light guide plate, or may be disposed on a mounting groove formed on a rear surface of the light guide plate.

According to another aspect of the present invention, there is provided a light emitting device comprising a base layer, a light emitting element disposed inside the base layer, a light transmitting film formed on an outer surface of the base layer, and a light guide plate for guiding light emitted from the light emitting element to the light transmitting film A method of manufacturing a case for a portable terminal, the method comprising the steps of: attaching the light guide plate to the back surface of the light transmitting film; forming the base layer by molding the light transmitting film and the light guide plate while inserting the light transmitting plate into the injection mold; And assembling the light emitting device on one side of the case.

The present invention also relates to a light emitting device comprising a base layer, a light emitting element disposed inside the base layer, a light transmitting film formed on an outer surface of the base layer, and a light guide plate for guiding light emitted from the light emitting element to the light transmitting film A method of manufacturing a case for a terminal, the method comprising the steps of: attaching the light guide plate to the back surface of the translucent film and disposing the light emitting element at a mounting position; molding the translucent film, And forming the base layer on the base layer.

A light emitting device and a light guide plate are disposed inside a base layer to provide a case light structure having a very slim thickness and a structure capable of increasing the brightness of light emitted to the outside.

Further, the present invention provides a case structure in which a base layer, a light emitting element, a light transmitting film, a light guide plate, and the like are integrated by an insert injection process so that a more rigid and easy-to-assemble case structure is provided.

Hereinafter, a portable terminal related to the present invention will be described in detail with reference to the drawings. The suffix "module" and " part "for components used in the following description are given merely for convenience of description, and do not give special significance or role in themselves. Accordingly, it should be noted that "module" and "part" may be used interchangeably.

The portable terminal can be implemented in various forms. For example, the portable terminal described in this specification may be used in various forms such as a mobile phone, a smart phone, a notebook computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player) . ≪ / RTI >

1 is a perspective view of a portable terminal according to an embodiment of the present invention.

Referring to FIG. 1, a portable terminal includes a first body 110 and a second body 120, which are foldably coupled to each other. However, the present invention is applicable to various types of terminals such as a slide type, a swivel type, a swing type, and a bar type, not limited to the 'folder type' portable terminal shown in FIG.

According to the present embodiment, the first body 110 and the second body 120 are rotatably connected through the hinge connection part 119. The hinge connection part 119 is provided with a cam device for providing an elastic force in the course of the rotation of the first body 110 and connecting means for electrically connecting the first body 110 and the second body 120 .

The state where the first body 110 is disposed in a state of being overlapped with the second body 120 may be referred to as a folding configuration and the first body 10 may be referred to as a second body 20 ) May be referred to as an unfolding configuration.

The mobile terminal operates mainly in the standby mode in the closed state, but the standby mode is also released by the user's operation. The portable terminal operates mainly in the communication mode in the open state, but is also switched to the standby mode by the operation of the user or a predetermined period of time.

The casing (housing, housing, cover, etc.) constituting the outer appearance of the first body 110 is formed by the front case 111 and the rear case 112. Various electronic components are embedded in the space formed by the front case 111 and the rear case 112.

At least one intermediate case may be additionally disposed between the front case 111 and the rear case 112.

The cases may be formed by injection molding a synthetic resin, or may be formed to have a metal material such as stainless steel (STS) or titanium (Ti) or the like.

The display unit 113, the first sound output unit 114, the first image input unit 115, and the like may be disposed in the first body 110, specifically, the front case 111.

The display unit 113 includes a liquid crystal display (LCD) module, an OLED (Organic Light Emitting Diodes) module, etc. that visually express information, and the display unit 113 further includes a touch screen, It may also be possible to input information.

The first image output unit 114 may be implemented as a receiver or a speaker. The first image input unit 115 may be implemented as a camera module for capturing an image or a moving image of a user Can be implemented.

The front case 121 and the rear case 122 may form the case of the second body 120, as in the case of the first body 110. [ The first and second operating portions 123 and 124 may be disposed on the front surface of the second body 120, specifically, the front case 121. [

At least one of the front case 121 and the rear case 122 may include a third operating unit 125, an acoustical input unit 126, and an interface 127.

The first to third operating portions 123, 124, and 125 may be collectively referred to as a manipulating portion, and any manner can be adopted as long as the tactile manner in which the user operates with a tactile impression.

For example, the operation unit may be implemented by a dome switch or a touch screen, a touch pad, or a wheel, a jog type, a joystick, or the like, As shown in FIG.

In terms of functions, the first operation unit 123 is for inputting commands such as start, end, and scroll, and the second operation unit 124 is for inputting numbers, letters, symbols, and the like. In addition, the third operating unit 125 may operate as a hot-key for performing a special function such as activation of the first image input unit 115 and the like.

The sound input unit 126 may be implemented in the form of a microphone, for example, to receive a user's voice, other sounds, and the like.

The interface 127 is a path for allowing a portable terminal related to the present invention to exchange data with an external device. For example, the interface 127 may be a wired or wireless connection terminal for connecting to an earphone, a port for short range communication (for example, an IrDA port, a Bluetooth port, a wireless LAN port a wireless Lan port), or power supply terminals for supplying power to the portable terminal.

The interface 127 may be a card socket that accepts an external card such as a subscriber identification module (SIM) or a user identity module (UIM), a memory card for information storage, and the like.

2 is a rear perspective view of the portable terminal of FIG.

Referring to FIG. 2, a second image input unit 116 may be additionally mounted to the rear case 112 of the first body 120.

The second image input unit 116 may have a photographing direction substantially opposite to that of the first image input unit 115 (see FIG. 1), and may be a camera having different pixels from the first image input unit 115.

For example, the first image input unit 115 has low pixels so that it is easy to capture a face of a user in the case of a video call or the like and transmit the face to the other party, and the second image input unit 116 photographs a general object, It is preferable to have a high pixel because it is often not transmitted.

If the second image input unit 116 is not separately provided, the first image input unit 115 may be rotatable so that the second image input unit 116 can be photographed up to the second image input unit 128.

The second sound output unit 128 may be additionally disposed in the rear case 122 of the second body 120. [ The second sound output unit 128 may implement a stereo function together with the first sound output unit 114 (see FIG. 1), and may be used for talking in a speakerphone mode.

And a power supply unit 129 for supplying power to the portable terminal is mounted on the rear case 122 side. The power supply 129 may be detachably coupled, for example, for charging, as a rechargeable battery, for example.

FIG. 3 is a front view of a portable terminal according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view of the portable terminal shown in FIG.

Referring to FIG. 3, the case is provided with a light emitting device 132 for implementing a lighting effect. The present embodiment has exemplified that the light emitting element 132 is provided in the rear case 111 of the first body 110. However, the present invention is not limited thereto, and the light emitting device 132 may be provided at various positions such as the rear case 122 of the second body 120 depending on the position for realizing the lighting effect.

Hereinafter, it is assumed that the light emitting device is provided inside the rear case 112 of the first body 110, but the configuration of the rear case 112 described below may be variously modified.

The light emitting device 132 according to the present embodiment generates light through the rear case 112 so as to realize a certain lighting effect. A light emitting diode (LED) may be used as the light emitting device 132 so as to reduce power loss and reduce the unit cost.

The light emitting device 132 is disposed inside the rear case 112, and the light emitting device 132 is indicated by a dotted line in FIGS. The plurality of light emitting devices 132 may be arranged in the rear case 112. These figures illustrate that the plurality of light emitting devices 132 are arranged along the width direction of the first body 110. [

Referring to FIG. 4, a display module 113a, a camera module 114a, a speaker module 115a, and the like are mounted in a space between the front case 111 and the rear case 112. These configurations may be connected to the main board of the second body 120 by the flexible circuit board 118. The flexible circuit board 118 electrically connects the light emitting element 132 inside the rear case 112 and the main board.

5 and 6, a detailed structure of the rear case 112 having the light emitting device 132 will be described. FIG. 5 is a cross-sectional view of the front case along the line IV-IV in FIG. 4, and FIG. 6 is a view illustrating an operation state of the light emitting device and the light guide plate shown in FIG.

5, the rear case 112 includes a base layer 131, a light emitting element 132, a light transmitting film 133, and a light guide plate 134.

The base layer 131 forms an outer appearance of the rear case 112 and functions as a base member for providing a durability to the front case 110. The base layer 131 may be formed of a synthetic resin material.

The light emitting device 132 is disposed inside the base layer 131 and generates light so as to realize a certain lighting effect under the control of the controller 170 (see FIG. 11).

The light emitting element 132 may be mounted on the printed circuit board 135. The printed circuit board 135 is disposed behind the light emitting element 132 and may have the form of a rigid substrate or a flexible substrate. A light emitting device 132 is mounted on the front surface of the printed circuit board and a connector 136 is provided on the rear surface of the printed circuit board for electrical connection. The flexible circuit board 118 connected to the second body 120 is connected to the connector 136.

The light transmitting film 133 is formed of a light transmitting material so that the light emitted from the light emitting element 132 can travel outside the rear case 112 and is formed on the outer surface of the base layer 131. Here, the concept of the 'translucent material' is a concept including 'translucent material' and 'transparent material'.

The translucent film 133 is preferably formed to be translucent so that the internal structures, for example, the light emitting device 132, the light guide plate 134, and the like are not visible from the outside. The translucent film 133 not only functions to transmit light emitted from the light emitting element 132 but also functions as a protective layer for protecting the base layer 134.

The light guide plate 134 is disposed inside the base layer 131 so as to be positioned behind the light transmitting film 133 and functions to guide the light emitted from the light emitting element 132 to the light transmitting film 133.

The present embodiment illustrates a structure in which the light emitting element 132 is disposed adjacent to one end of the light guide plate 134. [

7B) in which the light emitting device 132 and the light guide plate 134 are located and a second space 142 (see FIG. 7B) in which the printed circuit board 135 is located are formed in the base layer 131, ) May be formed. Here, the first space 141 and the second space 142 may be formed along the thickness direction of the base layer 131, respectively.

The first space 141 is formed to open a part of the front surface of the base layer 131 so that the light emitting device 132 and the light guide plate 134 are disposed to face the light transmitting film 133.

The second space 142 may be formed such that a rear surface of the base layer is open so that the rear surface of the printed circuit board 135 is exposed. Here, it is also possible that a structure in which only the connector 136 of the printed circuit board 135 is exposed and the remaining portion is covered with the base layer 131 is also possible.

6 shows the path of light emitted from the light emitting device 132. As shown in FIG. The light guide plate 134 may be provided with a pattern 134a for changing the path of light emitted from the light emitting device 1132. [ The pattern 134a may be formed on the back surface of the light guide plate 134 so as to have irregularities. 6, the light emitted from the light emitting device 132 is reflected by the pattern 134a of the light guide plate 134, and its direction of travel is changed toward the front of the rear case 112. [

The case structure of the present invention described above can realize a case lighting structure having a very slim thickness by disposing the light emitting element 132 and the light guide plate 134 inside the base layer 131. [ In addition, since the light emitting device 132 and the light guide plate 134 are disposed as close as possible to the outer surface of the rear case 112, the brightness of light emitted to the outside of the rear case 112 can be increased.

In addition, since all the components for the lighting effect are disposed in the rear case 112, it is convenient to assemble the front case 111 and the rear case 112 when they are assembled.

7A to 7C are views showing a method of manufacturing a case according to an embodiment of the present invention. Hereinafter, a method of manufacturing the case having the structure shown in FIG. 5 will be described.

First, as shown in FIG. 7A, the light guide plate 134 is attached to the rear surface of the light transmitting film 133. The light guide plate 134 may be attached to the light transmitting film 133 by an adhesive or an adhesive film.

Next, a base layer 131 is formed on the back surface of the light transmitting film 133 as shown in FIG. 7B. The base layer 131 may be formed by 'insert injection' or 'in-mold injection' in which the light transmitting film 133 with the light guide plate 133 is inserted into the injection mold. In this case, the injection mold should be formed so that the first and second spaces 141 and 142 described above can be realized, and the liquid synthetic resin is injected into the injection mold to form the base layer 131.

According to the insert injection, the base layer 131 is fused to the light transmitting film 133 and the light guide plate 134. Specifically, the base layer 131 is bonded to the light-transmissive film 133 and the light-guiding plate 134 by fusing them with each other. Thus, the base layer 131, the light-transmissive film 133, (134) are integrated with each other.

According to such a process, the bonding force of each structure is strengthened, a more rigid structure can be realized, and the thickness of the case can be minimized.

Next, when the printed circuit board 135 on which the light emitting device 132 is mounted is assembled so that the light emitting device 132 is positioned on one side of the light guide plate 134 as shown in FIG. 7C, the case manufacturing process is completed.

8A to 8C are views showing a manufacturing method and configuration of a case according to another embodiment of the present invention. In the drawings, the same or similar components as those of the previous embodiment are given the same reference numerals as those of the previous embodiment, and a detailed description thereof will be omitted.

8A, a light guide plate 234 is attached to the rear surface of the light transmissive film 233, and the light emitting device 232 is disposed on one side of the light guide plate 234 as shown in FIG. 8B. At this time, the printed circuit board 235 on which the light emitting element 232 is mounted can be positioned on the rear surface of the light guide plate. In this embodiment, a flexible substrate is used as a printed circuit board so as to further reduce the thickness of the case.

Next, a base layer 231 is formed on the rear surface of the light transmitting film 233 as shown in FIG. 8C. The base layer 231 is formed by molding the light transmitting film 233, the light guide plate 234, and the light emitting element 232 while inserting the light emitting element 232 into the injection mold.

The light emitting device 232 and the printed circuit board 235 may be integrated with the base layer 231, the light transmitting film 233, and the light guide plate 234 in addition to the above embodiment.

9A to 9C are views showing a manufacturing method and a configuration of a case according to another embodiment of the present invention. The drawings are also given the same reference numerals for the same or similar configurations as those of the preceding embodiments.

This embodiment shows a modified example of the mounting position of the light emitting element 332. [ According to the present embodiment, the light emitting element 332 is disposed on the mounting groove 334b formed on the rear surface of the light guide plate 334. [ Accordingly, the light emitting element 332 can be prevented from being exposed to the liquid synthetic resin when the insert is injected.

9A, the light guide plate 334 is attached to the rear surface of the light transmitting film 333, and then the light emitting device 332 is placed in the mounting groove 334b of the light guide plate 334 as shown in FIG. 9B . At this time, the printed circuit board 335 on which the light emitting element 332 is mounted may be attached to the back surface of the light guide plate 334.

Next, a base layer 231 is formed on the rear surface of the light transmitting film 333 as shown in FIG. 9C. The base layer 231 is formed by insert injection molding in which the light transmitting film 333, the light guide plate 334, the light emitting element 332 and the printed circuit board 335 are inserted into the injection mold in the same manner as in the previous embodiment .

10 is a rear perspective view of a portable terminal showing another application example of a case related to the present invention.

This figure illustrates the structure of a bar-type portable terminal, and the portable terminal includes a terminal body 410. A battery 429 may be removably mounted on the rear surface of the terminal body 410.

A battery cover 430 covering the battery 429 may be removably mounted on the rear surface of the terminal body 410. The concept of disposing the light emitting element and the light guide plate inside the case described above can be similarly applied to the battery cover 430. [

A connection terminal 401 for supplying power to the light emitting device 432 may be provided on the rear surface of the terminal body 410. In this case, .

As described above, the structure of the present invention can be modified as various forms of the case constituting the terminal body.

11 is a block diagram of a portable terminal according to the present invention.

11, a portable terminal according to an exemplary embodiment of the present invention includes a wireless communication module 171, operation units 123, 124 and 125, image input units 115 and 116, an acoustic input unit 126, a display unit 113, A sensing unit 176, an interface 127, a broadcast receiving module 175, a memory 174, a power supply unit 129, and a control unit 170. [

The control unit 170 typically controls the overall operation of the portable terminal. For example, voice communication, data communication, video communication, and the like.

The wireless communication module 171 transmits / receives wireless signals to / from the mobile communication base station through an antenna. A transmission unit 173 for transmitting and receiving voice data, character data, image data, and control data under the control of the control unit 170, for modulating and transmitting a signal to be transmitted for this purpose, a receiving unit 173 for demodulating the received signal, Lt; / RTI >

The operation units 123, 124, and 125 are configured as shown in FIG. 1, and provide the control unit 160 with key input data that the user inputs for controlling the operation of the terminal. The operation units 123, 124, and 125 include a dome switch, a touch pad (static / static), a jog wheel, a jog switch, and the like.

The image input units 115 and 116 process image frames such as still images or moving images obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame is converted into image data that can be displayed on the display unit 113 and output to the display unit 113.

The image frames processed by the image input units 115 and 116 are stored in the memory 174 under the control of the control unit 170 or transmitted to the outside through the wireless communication module 171. [

The sound input unit 126 receives an external sound signal by a microphone in a communication mode, a recording mode, a voice recognition mode, or the like, and processes it as electrical voice data. The processed voice data is converted into a form that can be transmitted to the mobile communication base station through the wireless communication module 171 in the communication mode, and is output to the wireless communication module. In the case of the recording mode, the processed voice data is output to be stored in the memory 174.

The sound input unit 126 may be implemented with various noise reduction algorithms for eliminating noise generated in the process of receiving an external sound signal.

For example, when the portable terminal is in the call mode, a control unit 170 controls the UI (User Interface) or GUI (Graphic User Interface) related to the call to be displayed on the display unit 113 And displays the captured image or the UI or GUI under the control of the control unit 170. When the display unit 113 includes a touch screen, , It is used as an input device in addition to the output device.

The sound output units 114 and 128 receive sound data received from the wireless communication module 161 under the control of the controller 170 in a call signal reception mode, a communication mode or a recording mode, a voice recognition mode, Converts the stored sound data and outputs it to the outside.

In addition, the sound output units 114 and 128 output sound signals related to functions (e.g., call signal reception sound, message reception sound, etc.) performed in the portable terminal. These sound output units 114 and 128 include a speaker, a receiver, a buzzer, and the like.

The sensing unit 176 senses the current state of the portable terminal, such as the opening / closing state of the portable terminal, the position of the portable terminal, whether or not the user touches the portable terminal, and generates a sensing signal for controlling the operation of the portable terminal. For example, it senses whether the portable terminal is in the folded state or the unfolded state, and outputs the sensing result to the controller 170 so that the operation of the terminal is controlled. And a sensing function related to whether or not the power supply unit 129 is powered on, whether the interface 126 is coupled to an external device, and the like.

The interface 127 may be any type of interface card such as a wired / wireless headset, an external charger, a wired / wireless data port, a card socket (for example, a memory card, a SIM / UIM card) It serves as an interface with the device. The interface 127 receives data from an external device or receives power from the external device, transfers the data to each component in the portable terminal, or transmits data in the portable terminal to an external device.

The memory 174 may store a program for processing and controlling the controller 170 and may have a function for temporarily storing input / output data (e.g., a phone book, a message, a still image, .

A program for controlling the operation of the portable terminal related to the present invention is stored in the memory 174

Such memory 174 includes the concept of a generally known hard disk, card type memory (e.g., SD or XD memory), flash memory, RAM, ROM, and the like.

The broadcast receiving module 175 receives broadcast signals transmitted through satellite or terrestrial waves and converts the broadcast signals into broadcast data formats that can be output to the sound output units 114 and 128 and the display unit 113 and outputs them to the controller 170. Further, the broadcast receiving module 165 receives additional data (e.g., EPG (Electric Program Guide), channel list, etc.) related to broadcasting. The broadcast data and the additional data converted by the broadcast receiving module 175 may be stored in the memory 164.

The power supply unit 129 receives external power and internal power under the control of the controller 170 and supplies power necessary for operation of the respective components.

The above-described portable terminal is not limited to the configuration and method of the embodiments described above, but all or some of the embodiments may be selectively combined so that various modifications may be made to the embodiments.

1 is a front perspective view of a mobile terminal according to an embodiment of the present invention;

2 is a rear perspective view of a portable terminal according to an embodiment of the present invention;

3 is a front view of a portable terminal according to an embodiment of the present invention;

4 is an exploded perspective view of the portable terminal shown in FIG.

5 is a sectional view of the front case along the line IV-IV in Fig.

6 is a view showing an operating state of the light emitting device and the light guide plate shown in Fig.

7A to 7C illustrate a method of manufacturing a case according to an embodiment of the present invention.

8A to 8C are views showing a manufacturing method and a configuration of a case according to another embodiment of the present invention.

9A to 9C show a manufacturing method and a configuration of a case according to still another embodiment of the present invention.

10 is a rear perspective view of a portable terminal showing another application example of the case related to the present invention.

11 is a block diagram of a portable terminal according to the present invention.

Claims (11)

A case for forming an outer appearance of the terminal body, and electronic parts embedded in the case, The case comprises: a base layer; A light emitting element disposed inside the base layer and implementing a lighting effect; A translucent film formed on an outer surface of the base layer; And And a light guide plate disposed inside the base layer so as to be positioned behind the light transmitting film and guiding the light emitted from the light emitting element to the light transmitting film, Wherein the base layer is formed by insert injection molding in which the light transmitting film with the light guide plate is inserted into the injection mold, A first space and a second space are formed in the base layer along the thickness direction of the base layer, Wherein the first space is formed to open a part of the front surface of the base layer, the light emitting device and the light guide plate are located in the first space, and the printed circuit board on which the light emitting device is mounted is located in the second space The mobile terminal being characterized by: The method according to claim 1, Wherein the base layer is formed of a synthetic resin material and is fused to the light transmitting film and the light guide plate. delete The method according to claim 1, Wherein the light emitting device is disposed adjacent to one end of the light guide plate. The method according to claim 1, Wherein the light emitting element is disposed on a mounting groove formed on a rear surface of the light guide plate. The method according to claim 1, Wherein the light guide plate is formed with patterns for changing the path of light emitted from the light emitting device. The method according to claim 1, And the printed circuit board is disposed behind the light emitting device. delete delete A light emitting device comprising: a base layer; a light emitting element disposed in the base layer; a light transmitting film formed on an outer surface of the base layer; and a light guide plate for guiding the light emitted from the light emitting element to the light transmitting film In the production method, Attaching the light guide plate to a rear surface of the translucent film; Forming the base layer by molding the light transmissive film and the light guide plate while inserting the light transmissive film and the light guide plate into the injection mold; And And assembling the light emitting device on one side of the light guide plate, In the forming of the base layer, a first space in which the light emitting device and the light guide plate are located and a second space in which the printed circuit board on which the light emitting device is mounted are formed in the base layer, The space and the second space are formed along the thickness direction of the base layer, Wherein the first space is formed to open a surface area of the front surface of the base layer. delete

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