阅读说明：本技术 一种封装结构及移动终端 (Packaging structure and mobile terminal ) 是由 曲林 叶润清 吕秀启 史洪宾 龙浩晖 于 2019-08-15 设计创作，主要内容包括：本申请提供了一种封装结构及移动终端,该封装结构包括基板,基板具有设置有器件的第一表面。该封装结构还包括密封腔体罩,用来保护压力敏感器件。该密封腔体罩与基板密封连接。在设置该压力敏感器件时,压力敏感器件位于密封腔体罩的保护腔体内并与基板电连接。此外,该封装结构还包括第一封装层,该第一封装层用于封装基板的第一表面上的器件,并且封装密封腔体罩。在形成第一封装层时,需要用到封装模流工艺,该封装模流随着系统集成的尺寸和集成度的增加,使得模流压力参数有增大的趋势,而在本申请中通过设置的密封腔体罩保护压力敏感器件,通过密封腔体罩承受模流压力,从而提高了压力敏感器件的安全性,进而提高了封装结构的质量。(The application provides a packaging structure and a mobile terminal, and the packaging structure comprises a substrate, wherein the substrate is provided with a first surface provided with a device. The packaging structure also comprises a sealed cavity cover used for protecting the pressure sensitive device. The sealed cavity cover is hermetically connected with the substrate. When the pressure sensitive device is arranged, the pressure sensitive device is positioned in the protective cavity of the sealed cavity cover and is electrically connected with the substrate. In addition, the package structure further comprises a first package layer for packaging the device on the first surface of the substrate and packaging the sealed cavity cover. When the first packaging layer is formed, a packaging mold flow process is needed, mold flow pressure parameters tend to increase along with the increase of the size and the integration level of system integration, the pressure sensitive device is protected through the arranged sealing cavity cover in the application, and mold flow pressure is borne through the sealing cavity cover, so that the safety of the pressure sensitive device is improved, and the quality of a packaging structure is improved.)

1. A package structure, comprising:

a substrate having a first surface;

the sealed cavity cover is arranged on the first surface of the substrate and is connected with the substrate in a sealing mode; the sealed cavity cover is provided with a protection cavity;

the pressure sensitive device is positioned in the protection cavity and is electrically connected with the substrate;

and the first packaging layer is used for packaging the sealed cavity cover.

2. The package structure of claim 1, wherein the sealed cavity cap is sealingly connected to the substrate.

3. The package structure of claim 2, wherein the sealed cavity cap is solder or adhesively attached to the substrate.

4. The package structure of claim 2, wherein the sealed cavity housing is spaced apart from the pressure sensitive device by a gap.

5. The package structure according to claim 2, wherein the sealed cavity cover comprises an annular protection wall, and a protection cover covering the protection wall, and the protection cover is connected with the protection wall in a sealing manner.

6. The package structure of claim 5, wherein the protective wall and the protective cover are a unitary structure.

7. The package structure of claim 1, wherein the sealed cavity cap is a second encapsulation layer, and the second encapsulation layer encapsulates the pressure sensitive device.

8. The package structure of claim 1, wherein the sealed cavity cap comprises: the pressure sensor comprises a limiting cover surrounding the pressure sensor and a third packaging layer filled in the limiting cover and wrapping the pressure sensor.

9. The package structure of claim 8, wherein a side of the position limiting cover facing away from the first surface is provided with an opening.

10. The package structure of claim 9, further comprising a limiting plate covering the opening, wherein the limiting plate is connected to the limiting cap in a sealing manner.

11. A mobile terminal, comprising a housing, and the package structure according to any one of claims 1 to 10 disposed in the housing.

Technical Field

The application relates to the technical field of packaging, in particular to a packaging structure and a mobile terminal.

Background

The system-in-package chip is applied to terminal products such as mobile phones, watches and system board module products in more and more scenes, for example, a radio frequency package chip uses a system-in-package, and a wearable smart watch uses a system-in-package design. The manufacturing process of the system-in-package chip requires a packaging process, and a packaging mold flow process is required. The requirement on the filling property of the mold flow is only higher and higher along with the increase of the size and the integration level of system integration, so that the pressure parameter of the mold flow tends to increase, and the improvement of the package integration level requires that a device used in a package is assembled by using a bare chip as much as possible. When the bare chip is used under the condition of small original packaging size, the mold flow pressure is relatively small, and the pressure damage to the mold flow device is small. The reduction of height gaps of solder joints and the increase of the number of chips due to the increase of density of solder joints of devices in a package require an increase of mold flow pressure to realize more reliable filling, and bring new challenges to the reliability of bare chips and mold flow pressure sensitive devices (filters, crystal oscillators, etc.) in the package. The injection molding pressure of a lower mold of the existing packaging process is generally 5-10MPa, and the problem of failure caused by over-large mold pressing of partial devices is already caused when the pressure of the lower mold is 6 MPa.

Disclosure of Invention

The application provides a packaging structure and a mobile terminal, which are used for improving the safety of a pressure sensitive device of the mobile terminal and further improving the quality of the packaging structure.

In a first aspect, a package structure for a mobile terminal is provided, wherein the package structure comprises a substrate substantially carrying a device, and the substrate has a first surface on which the device can be disposed when the device is disposed. In addition, the packaging structure also comprises a sealed cavity cover which is used as a protection device for protecting the devices which cannot bear larger pressure in the devices arranged on the first surface. The sealed cavity cover is arranged on the first surface of the substrate and is connected with the substrate in a sealing mode, in addition, the sealed cavity cover is provided with a protection cavity, and a device to be protected can be located in the protection cavity. The device to be protected is a pressure sensitive device which is the device incapable of bearing larger pressure, and when the pressure sensitive device is arranged, the pressure sensitive device is positioned in the protection cavity and is electrically connected with the substrate. In addition, the packaging structure further comprises a first packaging layer, wherein the first packaging layer is used for packaging the device on the first surface of the substrate and packaging the sealed cavity cover. When the first packaging layer is formed, a packaging mold flow process is needed, mold flow pressure parameters tend to increase along with the increase of the size and the integration level of system integration, the pressure sensitive device is protected through the arranged sealing cavity cover in the application, and mold flow pressure is borne through the sealing cavity cover, so that the safety of the pressure sensitive device is improved, and the quality of a packaging structure is improved.

In a specific embodiment, the sealed chamber housing is sealingly connected to the substrate. The sealed cavity cover is connected with the substrate in a sealing mode, so that the cavity is protected from the outside.

In a specific embodiment, the sealed chamber housing is welded or adhesively attached to the substrate. The sealing connection effect is realized through different processes.

In a specific possible embodiment, a gap is provided between the sealed housing cover and the pressure sensitive device. The safety of the pressure sensitive device is improved.

In a specific possible embodiment, the sealed cavity cover comprises an annular protection wall and a protective cover covering the protection wall, and the protective cover is connected with the protection wall in a sealing mode. The sealed chamber housing is realized by different structures.

In a specific possible embodiment, the protective wall and the protective cover are of a unitary structure. The sealed chamber housing is realized by different structures.

In a specific possible embodiment, the sealed cavity cover is made of metal or ceramic. The sealed cavity cover is prepared by different materials.

In a specific possible embodiment, the sealed cavity cover comprises a second encapsulation layer, and the second encapsulation layer wraps the pressure sensitive device. And the pressure sensitive device is protected by the second packaging layer.

In a specific embodiment, the thickness of the second encapsulation layer to the pressure sensitive device is greater than a set thickness to ensure that the second encapsulation layer can withstand the mold flow pressure.

In a specific embodiment, the sealed chamber housing comprises: the pressure sensor comprises a limiting cover surrounding the pressure sensor and a third packaging layer filled in the limiting cover and wrapping the pressure sensor. And the third packaging layer is ensured to be molded through the limiting cover, and the pressure sensitive device is protected through the third packaging layer.

In a specific possible embodiment, an opening is arranged on the side of the position limiting cover, which faces away from the first surface. The third encapsulation layer is filled through the opening.

In a specific practical embodiment, the device further comprises a limiting plate covering the opening, and the limiting plate is connected with the limiting cover in a sealing mode. And sealing is carried out again through the limiting plate, so that the pressure sensitive device is protected.

In a second aspect, a mobile terminal is provided, which includes a housing, and the package structure of any one of the above items disposed in the housing.

Drawings

Fig. 1 is a schematic structural diagram of a mobile terminal according to an embodiment of the present application;

fig. 2 is a schematic diagram of a first package structure according to an embodiment of the disclosure;

FIG. 3a is a schematic view of a connection between a sealed chamber cover and a substrate according to an embodiment of the present invention;

FIG. 3b is a schematic view of another connection of the sealed chamber cover and the substrate according to the embodiment of the present invention;

FIG. 4a is a schematic diagram of a sealed chamber housing according to an embodiment of the present invention;

FIG. 4b is a schematic structural diagram of a sealed chamber cover according to an embodiment of the present disclosure;

FIG. 5a is a diagram of a package structure in the prior art;

FIG. 5b is a diagram illustrating a force analysis of a bare chip according to the prior art;

FIG. 5c is a force analysis diagram of a pressure sensitive device provided in an embodiment of the present application;

fig. 6 is a schematic diagram of a second package structure provided in the embodiment of the present application;

FIG. 7 is a pressure diagram of different modulus prepackaging materials and different prepackaged dimensions versus pressure sensitive device;

fig. 8 is a schematic diagram of a third package structure provided in the embodiment of the present application;

fig. 9 is a schematic diagram of a fourth package structure according to an embodiment of the present application.

Detailed Description

To facilitate understanding of the package structure provided in the embodiments of the present application, an application scenario of the package structure is first described, where the package structure is applied to a terminal product, such as a mobile phone, a tablet computer, or a wearable device (e.g., an electronic watch).

As shown in fig. 1, taking a mobile phone as an example, the mobile terminal includes a housing 20 and a printed circuit board disposed in the housing 20, where the printed circuit board may be a main board 30 of the mobile terminal, and the package structure 10 is disposed on the printed circuit board. When the package structure 10 is connected to the motherboard 30, the package structure 10 may be electrically connected to the motherboard 30 through LGA (land grid array) or BGA (ball grid array), as shown in fig. 1, and the package structure 10 may be electrically connected to the motherboard 30 through BGA (ball grid array shown by a plurality of black dots in fig. 1).

Referring to fig. 2 together, fig. 2 is a schematic structural diagram illustrating a package structure provided in an embodiment of the present application, where the package structure 10 may include: a substrate 11, the substrate 11 may be a printed circuit board or other type of circuit board. The substrate 11 has a first surface and a second surface opposite to each other, wherein the first surface is used for carrying devices, and the second surface is used for connecting with the motherboard 30 shown in fig. 1.

With continued reference to fig. 2, the first surface of the substrate 11 provided in the embodiment of the present disclosure is provided with a plurality of devices, which may be packaged chips, bare chips, passive devices, and the like. When the device is connected to the substrate 11, a circuit layer is provided on the substrate 11, and the device may be electrically connected to the circuit layer of the substrate 11 through a pad.

In order to protect the above devices, the package structure 10 provided in the embodiment of the present application may further include a first encapsulation layer 13, where the first encapsulation layer 13 covers the first surface of the substrate 11 and is used to encapsulate the above devices. In the specific packaging, the device may be packaged by a package mold flow process, and in the sampling of the package mold flow process, the substrate 11 carrying the device needs to be placed in a mold, and then a high-pressure and high-temperature packaging material is filled in the mold by a packaging device, and is cooled and solidified. In the above process, the device needs to bear larger die flow pressure, so for convenience of description, the device is divided, and the device which can bear larger pressure during packaging is called a pressure-resistant device 12, the device which cannot bear larger pressure during packaging is called a pressure-sensitive device 15, and the pressure-sensitive device 15 can be devices such as a filter, a crystal oscillator and the like. In order to ensure the safety of the pressure sensitive device 15 during packaging, the package structure 10 provided in the embodiment of the present application is further provided with a sealed cavity cover 14, and the sealed cavity cover 14 serves as a protection device for protecting the pressure sensitive device 15.

As shown in fig. 2, when the sealed chamber cover 14 is coupled to the substrate 11, the sealed chamber cover 14 is disposed on the first surface of the substrate 11 and is hermetically coupled to the substrate 11, and the sealed chamber cover 14 covers the pressure sensitive device 15 when coupled to the substrate 11. The sealed housing 14 has a protective housing in which the pressure sensitive device 15 is located. With continued reference to fig. 2, the pressure sensitive device 15 is sealed in a protective space by the seal cavity cover 14 and the substrate 11, and when the package is encapsulated by the package molding process, the mold pressure is not directly applied to the pressure sensitive device 15 by providing a force against the mold pressure by the seal cavity cover 14. So that the safety of the pressure sensitive device 15 can be improved. And in particular implementation, the sealed cavity cover 14 can protect not only one pressure sensitive device 15 as shown in fig. 2, but also the number of pressure sensitive devices 15 to be protected can be determined according to the needs. When the number of the pressure sensitive devices 15 is multiple, different seal cavity covers 14 may be used to respectively protect one pressure sensitive device 15, or one seal cavity cover 14 may be used to simultaneously protect a plurality of pressure sensitive devices 15, that is, one pressure sensitive device 15 may be disposed in a cavity formed by sealing the seal cavity cover 14 and the substrate 11, or a plurality of pressure sensitive devices 15 may be disposed, which is not limited in this application.

As shown in fig. 3a, fig. 3a shows a specific connection between the sealed housing lid 14 and the substrate 11. In fig. 3a, the hermetically sealed cavity cover 14 and the substrate 11 may be soldered by solder 101. In a specific soldering process, a plating process (plating a metal layer on the sealed chamber cover 14) may be performed at a position where the sealed chamber cover 14 and the substrate 11 are soldered, and the plating layer may be made of a material capable of performing a soldering reaction with the solder 101. And when welding, the contact position of the sealed cavity cover 14 and the substrate 11 is welded and sealed, so that a sealed protection space is formed between the sealed cavity cover 14 and the substrate 11.

Fig. 3b shows another specific way of connecting the sealed housing lid 14 to the substrate 11, as shown in fig. 3 b. In fig. 3b, the sealed housing cover 14 is adhesively connected to the substrate 11 by means of an adhesive 102. In the specific bonding, the seal cavity cover 14 is firstly buckled on the pressure sensitive device 15, then a circle of bonding glue 102 is coated on the periphery of the seal cavity cover 14, the bonding glue 102 is used for bonding and connecting the seal cavity cover 14 with the substrate 11, and in the coating process, the bonding glue 102 is continuously coated, so that the seal connection between the seal cavity cover 14 and the substrate 11 is ensured. Furthermore, the surface of the seal cavity cover 14 for connecting with the substrate 11 may be coated with an adhesive 102, and when the seal cavity cover 14 is covered on the substrate 11, the seal cavity cover 14 is pre-positioned by the adhesive 102, and then a circle of the adhesive 102 is coated for bonding, so that the bonding strength between the seal cavity cover 14 and the substrate 11 can be improved, and the sealing effect between the seal cavity cover 14 and the substrate 11 can also be improved.

When the sealed cavity cover 14 is specifically manufactured, the material of the sealed cavity cover 14 may be metal, or may be made of ceramic, or resin and other materials capable of providing a certain structural strength protection. The purpose is to provide the capsule housing 14 with a high structural strength to absorb the dimension of subsequent die flow pressure. If the material itself has higher strength, the thickness of the seal chamber cover 14 can be designed to be slightly thinner. And as for the structure of the sealed chamber cover 14, either an integrated structure or a split structure may be adopted. As shown in fig. 4a, the sealed cavity cover 14 shown in fig. 4a is of an integrated structure, and at this time, the sealed cavity cover 14 includes the protection wall 142 and the protection cover 141, and the protection wall 142 and the protection cover 141 are integrally formed, and during the preparation, the sealed cavity cover 14 may be made of a metal material and prepared by a stamping or casting process, and when the integrated structure is adopted, the sealed cavity cover 14 has good pressure resistance, and when the sealed cavity cover is connected with the substrate 11, only a gap between the sealed cavity cover 14 and the substrate 11 needs to be sealed.

As shown in fig. 4b, fig. 4b shows another configuration of the sealed housing enclosure 14. In fig. 4b, the sealed chamber cover 14 includes a ring-shaped protection wall 142, and a protection cover 141 covering the protection wall 142, and the protection cover 141 and the protection wall 142 are connected in a sealing manner. In a specific preparation, the protective wall 142 and the protective cover 141 may be hermetically connected by welding or bonding. If the welding method is adopted, the protection wall 142 and the protection cover 141 are both made of metal material, and then the protection cover 141 is covered on the protection wall 142, and the protection cover 141 and the protection wall 142 are hermetically connected by welding a circle with the solder 143.

Reference is also made to fig. 2 and 5a, wherein fig. 5a is a schematic diagram illustrating a package structure in the prior art. The package structure in the prior art includes a substrate 1, a device 2 and a device 4 carried on the substrate 1, and an encapsulation layer 3 encapsulating the device 2 and the device 4, and the encapsulation layer 3 is directly contacted with the device 2 and the device 4 during encapsulation. The packaging structure provided by the embodiment of the application is different from the packaging structure in the prior art for convenience of understanding. Reference is also made to fig. 5b and 5c, where fig. 5b is a die flow pressure experienced by a device in the prior art, and fig. 5c is a die flow pressure experienced by a pressure sensitive device provided by an embodiment of the present application. Referring first to fig. 5b, in the package structure of the prior art, since the package material directly acts on the device 4, the device 4 is subjected to mold pressure in the up, down, left, right, front, and back directions, and is easily damaged for a device with a low pressure ratio. In the package structure provided in the embodiment of the present application, since the pressure sensitive device 15 is sealed by the seal cavity cover 14 and the substrate 11 in a protection space, the die flow pressure is fully applied to the seal cavity cover 14 during packaging, and the seal cavity cover 14 has a certain strength, so that a force resisting the die flow pressure can be provided. In addition, when the pressure sensitive device 15 is covered by the seal cavity cover 14, a certain gap is formed between the seal cavity cover 14 and the pressure sensitive device 15, so that the pressure sensitive device 15 cannot be extruded even if the seal cavity cover 14 deforms to a certain degree, and the safety of the pressure sensitive device 15 is better ensured.

In addition, when the technology of fig. 1 is adopted, in order to solve the problem of extrusion of the device, optimization of device type selection is often adopted, the specification of the device with high pressure resistance is selected, or lower die flow pressure is used, so that damage to the device is reduced, and both methods are used for avoiding stress damage to the device caused by overlarge die flow pressure. The problem of insufficient encapsulation caused by the reduction of the mold flow pressure causes the problems of holes in encapsulation or interface cracking caused by insufficient interface bonding. The use of a device having a high withstand voltage further increases the restriction on the device, and may cause a problem of insufficient productivity. In the packaging structure provided by the embodiment of the application, because of the protection of the sealed cavity cover, the mold flow pressure does not need to be reduced, and the device does not need to be optimized, so that the requirement on the type selection of the device can be reduced, and the packaging reliability can be ensured.

As shown in fig. 6, fig. 6 illustrates another package structure. Wherein like reference numerals in figure 6 may refer to like reference numerals in figure 2. The package structure provided in fig. 6 differs from the package structure provided in fig. 2 in the sealing chamber cover. In fig. 6 the sealed chamber cover provides a seal with the encapsulation layer. The sealed cavity cap now comprises the second encapsulation layer 16. The second encapsulation layer 16 encapsulates the pressure sensitive device 15. In specific setting, one second encapsulation layer 16 may only wrap one pressure sensitive device 15, and when the number of the pressure sensitive devices 15 is multiple, different second encapsulation layers 16 may also wrap each pressure sensitive device 15 respectively; alternatively, when the plurality of pressure sensitive devices 15 are relatively close to each other, the plurality of pressure sensitive devices 15 may be sealed by using a second encapsulation layer 16. When the second encapsulation layer 16 is specifically prepared, the pressure sensitive device 15 is also sealed by using an encapsulation molding process, but since the second encapsulation layer 16 only encapsulates the pressure sensitive device 15, a smaller molding pressure may be used, specifically: the die flow pressure for making the second encapsulation layer 16 is less than the die flow pressure for making the first encapsulation layer 13. Therefore, the pressure sensitive device 15 can be encapsulated by the second encapsulating layer 16, and the first encapsulating layer 13 is prepared after the second encapsulating layer 16 is cured, so that the second encapsulating layer 16 can protect the pressure sensitive device 15 when the first encapsulating layer 13 is prepared.

With continued reference to fig. 6, the second encapsulation layer 16 encapsulates the pressure sensitive device 15 during the preparation of the second encapsulation layer 16, so that no mold pressure is applied to the pressure sensitive device 15 during the preparation of the first encapsulation layer 13. And the effect of the second encapsulation layer 16 on resisting the die flow pressure is related to the thickness of the second encapsulation layer 16, so that when the second encapsulation layer 16 is disposed, the thickness from the second encapsulation layer 16 to the pressure sensitive device 15 may be greater than a set thickness to ensure that the second encapsulation layer 16 can bear the die flow pressure, and the set thickness may be defined according to actual needs, and is not specifically limited herein. Referring also to fig. 7, fig. 7 shows a pressure diagram of different modulus prepackaging materials and different prepackaging dimensions versus pressure sensitive device 15, i.e., providing resistance to mold flow pressure when preparing second encapsulant layers 16 of different thicknesses. As can be seen from fig. 7, as the thickness of the second encapsulation layer 16 increases, the mold flow pressure that the second encapsulation layer 16 can resist increases.

As shown in fig. 8, fig. 8 illustrates another package structure provided in the embodiment of the present application, wherein the same reference numbers in fig. 8 may refer to those shown in fig. 2 and fig. 6. The package structure shown in fig. 8 is different from the package structure shown in fig. 6 in the structure of the hermetic chamber cover. In the package structure shown in fig. 8, the sealed chamber cover includes: the limiting cover surrounds the pressure sensitive device 15, is of a cylindrical structure, and is provided with openings at the top end and the bottom end; the bottom of the limiting cover is connected with the first surface of the substrate 11 by welding or bonding through bonding glue. And an opening is formed in one surface, deviating from the first surface, of the limiting cover, and the packaging material is filled into the limiting cover through the opening by adopting a packaging mold flow process and wraps the pressure sensitive device 15. After cooling and solidification, a third encapsulation layer 17 is formed which encapsulates the pressure sensitive device 15. And then preparing a first packaging layer 13 through a packaging mold flow process to package all devices.

Referring to fig. 9, fig. 9 is a schematic diagram illustrating another package structure provided in an embodiment of the present application. Wherein like reference numerals in figure 9 may refer to those shown in figures 2 and 6, 8. The package structure shown in fig. 9 is different from the package structure shown in fig. 8 in the structure of the sealed chamber cover. In the package structure shown in fig. 9, the sealed cavity cover includes: the limiting cover 192 surrounds the pressure sensitive device 15, the limiting cover 192 is of a cylindrical structure, and the top end and the bottom end of the limiting cover 192 are open; the bottom of the position limiting cover 192 is soldered or bonded to the first surface of the base plate 11 by an adhesive. An opening is formed in a side, away from the first surface, of the limiting cover 192, and an encapsulation molding flow process is adopted to fill the encapsulation material into the limiting cover 192 through the opening and wrap the pressure sensitive device 15 to form a third encapsulation layer 17. The sealed cavity cover can further comprise a limiting plate 191 covering the opening, and the limiting plate 191 is connected with the limiting cover 192 in a sealing mode. In the specific connection, the limit plate 191 and the limit cover 192 are hermetically connected by welding. When the limit cover 192 is connected with the substrate 11 in a sealing manner, a sealed space is enclosed by the limit cover 192, the limit plate 191 and the substrate 11 to protect the pressure sensitive device 15. There are two layers of protection on the outside of the pressure sensitive device 15 at this time: a third packaging layer 17, a limit cover 192 and a limit plate 191. The pressure sensitive device 15 is protected through the two-layer structure, and the safety of the pressure sensitive device 15 is better improved.

With continued reference to fig. 1, the present embodiment further provides a mobile terminal, which includes a housing 20 and a printed circuit board disposed in the housing 20, where the printed circuit board may be a main board 30 of the mobile terminal, and the package structure 10 is disposed on the printed circuit board. The package structure 10 may be any of the above packages. When the package structure 10 is connected to the motherboard 30, the package structure 10 may be electrically connected to the motherboard 30 through LGA (land grid array) or BGA (ball grid array), as shown in fig. 1, and the package structure 10 is electrically connected to the motherboard 30 through BGA (ball grid array). The pressure sensitive device is protected by the arranged sealing cavity cover, and the die flow pressure is borne by the sealing cavity cover, so that the safety of the pressure sensitive device is improved, and the quality of a packaging structure is improved.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.