CN109068507B

CN109068507B - Electronic device

Info

Publication number: CN109068507B
Application number: CN201811142615.2A
Authority: CN
Inventors: 马静一
Original assignee: Oppo Chongqing Intelligent Technology Co Ltd
Current assignee: Oppo Chongqing Intelligent Technology Co Ltd
Priority date: 2018-09-28
Filing date: 2018-09-28
Publication date: 2020-03-31
Anticipated expiration: 2038-09-28
Also published as: CN109068507A

Abstract

The application discloses electronic device, it includes: a display screen, a frame and a buffer; the display screen is covered on the frame, and the frame is provided with a limit groove; the buffer part is filled in the limiting groove, and the buffer part exceeds the surface of one side, close to the display screen, of the frame by a preset height. The structure is characterized in that the frame is provided with a limiting groove, the buffer piece is filled in the limiting groove, and the buffer piece exceeds the surface of one side, close to the display screen, of the frame by a preset height. Therefore, the thickness of the buffer piece is thicker, the compression amount is larger, the scene that the deformation amount is larger when the electronic device is subjected to a drop test is met, and the anti-falling performance of the electronic device is improved. Meanwhile, compared with a structure that a buffering part is directly arranged between the display screen and the frame, the buffering part is positioned in the limiting groove, so that the buffering part can not shift when the electronic device falls. Compare the structure that directly sets up the bolster between display screen and frame in addition, the area of above structure bolster and display screen contact is littleer, does benefit to the heat dissipation.

Description

Electronic device

Technical Field

The present disclosure relates to electronic devices, and particularly to an electronic device.

Background

At present, a display screen of an electronic device such as a mobile phone is arranged on a frame body, and a buffer part is often arranged between the display screen and the frame in order to improve the anti-falling performance of the electronic device. However, electronic devices such as mobile phones are getting thinner and thinner, so that the thickness of the buffer member arranged between the display screen and the frame is limited, and the requirements of drop tests are difficult to meet.

Disclosure of Invention

The application provides an electronic device to the limited technical problem that is difficult to satisfy the drop test requirement of bolster thickness between display screen and the frame.

The technical scheme adopted by the application is as follows: provided is an electronic device, including: a display screen, a frame and a buffer; the display screen is covered on the frame, and the frame is provided with a limit groove; the buffer piece is filled in the limiting groove, and the buffer piece exceeds the surface of the frame close to one side of the display screen by a preset height.

The application provides an electronic device is through seting up the spacing groove on the frame to fill the bolster in the spacing groove, and make the bolster surpass the frame and be close to the surface preset height of display screen one side. By adopting the structure, the thickness of the buffer part can be thicker, the compression amount is larger, the scene that the deformation amount is larger when the electronic device is subjected to a drop test is met, and the anti-falling performance of the electronic device is improved. Meanwhile, compared with a structure that a buffering part is directly arranged between the display screen and the frame, the buffering part is positioned in the limiting groove, so that the buffering part can not shift when the electronic device falls. Compare the structure that directly sets up the bolster between display screen and frame in addition, the area of above structure bolster and display screen contact is littleer, does benefit to the heat dissipation.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic front view of an electronic device according to an embodiment of the present disclosure;

FIG. 2 is an exploded view of a portion of an electronic device according to an embodiment of the present disclosure;

FIG. 3 is an exploded view of a partial cross-sectional structure of an embodiment of an electronic device according to the present application;

FIG. 4 is a cross-sectional view of a portion of the electronic device shown in FIG. 3 after a buffer member is filled in the frame and is pressed by the display screen;

FIG. 5 is a schematic view of a portion of an embodiment of the framework of the present application;

FIG. 6 is a schematic view of a portion of another embodiment of the framework of the present application;

FIG. 7 is an exploded view of a portion of another embodiment of an electronic device of the present application;

FIG. 8 is a schematic structural diagram of an embodiment of a display screen of the present application;

FIG. 9 is an exploded view of a portion of an electronic device according to another embodiment of the present application;

FIG. 10 is a schematic diagram of a portion of an electronic device according to an embodiment of the present application;

fig. 11 is a schematic structural view of the electronic device shown in fig. 10 after the buffering member is filled in the limiting groove;

FIG. 12 is a schematic diagram of a portion of another embodiment of an electronic device of the present application;

FIG. 13 is a schematic diagram of a portion of an electronic device according to yet another embodiment of the present application;

fig. 14 is a schematic partial structural diagram of an electronic device according to another embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an electronic device according to the present application. Specifically, the electronic device 100 may be any of various types of computer system devices (only one modality is exemplarily shown in fig. 1) that are mobile or portable and perform wireless communication. Specifically, the electronic apparatus 100 may be a mobile phone or a smart phone (e.g., an iPhone (TM) based phone), a Portable game device (e.g., Nintendo DS (TM), PlayStation Portable (TM), game Advance (TM), iPhone (TM)), a laptop computer, a PDA, a Portable internet device, a music player and a data storage device, other handheld devices and devices such as a headset, etc., and the electronic apparatus 100 may also be other wearable devices that require charging (e.g., a Head Mounted Device (HMD) such as an electronic bracelet, an electronic necklace, an electronic device or a smart watch).

The electronic apparatus 100 may also be any of a number of electronic devices including, but not limited to, cellular phones, smart phones, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, video recorders, cameras, other media recorders, radios, medical devices, vehicle transportation equipment, calculators, programmable remote controllers, pagers, laptop computers, desktop computers, printers, netbook computers, Personal Digital Assistants (PDAs), Portable Multimedia Players (PMPs), moving Picture experts group (MPEG-1 or MPEG-2) Audio layer 3(MP3) players, portable medical devices, and digital cameras and combinations thereof, among other devices having a display screen.

In some cases, electronic device 100 may perform multiple functions (e.g., playing music, displaying videos, storing pictures, and receiving and sending telephone calls). If desired, the electronic device 100 may be a device such as a cellular telephone, media player, other handheld device, wrist watch device, pendant device, earpiece device, or other compact portable device having a display screen.

To better illustrate the improvement of the present application, the general structure of the electronic device 100a before improvement is described below. Fig. 2 is a schematic partial structure diagram of an electronic device 100a before structure modification. Before the structural improvement, in order to improve the anti-falling performance of the electronic device 100a, a buffer member 30a is often disposed between the frame 10a and the display screen 20a, and the area of the buffer member 30a is larger, covering a larger area of the display screen 20 a. However, the electronic device 100a such as a mobile phone is getting thinner and thinner, so that the thickness of the buffer 30a disposed between the frame 10a and the display screen 20a is limited, and therefore the compression amount of the buffer 30a is limited, which is often difficult to satisfy the requirements of the drop test, especially in the scenario of large deformation amount when the mobile phone falls. Secondly, the above structural buffer 30a covers a large area of the display screen 20a and thus is not favorable for heat dissipation.

The structure of the electronic device 100 after the improvement of the present application will be specifically explained below with reference to the accompanying drawings.

Referring to fig. 3, in particular, the electronic device 100 includes a frame 10, a display screen 20 covering the frame 10, and a buffer 30 partially disposed in the frame 10.

Specifically, in one embodiment, the frame 10 is a middle frame or a battery cover of the electronic device 100, and is used for supporting and fixing the display screen 20, a circuit board, various electronic devices, and the like. In this application, the frame 10 is provided with a limiting groove 12, and the limiting groove 12 is used for arranging the buffer 30. The buffer 30 is partially filled in the limiting groove 12, and the buffer 30 exceeds the surface of the frame 10 on the side close to the display screen 20 by a predetermined height.

Optionally, in various embodiments, the buffer 30 includes at least one of foam or elastic gel. In other embodiments, the buffer member 30 may be other substances as long as it can deform to play a buffering role when being stressed, which is exhaustive and limited.

The display screen 20 is covered on the frame, the display screen 20 is used for displaying pictures such as pictures and videos, a glass cover plate 40 is arranged on one side of the display screen 20, which is far away from the frame 10, and the glass cover plate 40 is a front shell of the electronic device 100. The glass cover plate 40 is made of a transparent glass material, the cover plate glass 40 is used for protecting the display screen 20, and a user can see the picture displayed by the display screen 20 through the glass cover plate 40.

By adopting the structure, the thickness of the buffer member 30 can be thicker, the compression amount is larger, the scene that the deformation amount is larger when the electronic device 100 is in a drop test is met, and the anti-falling performance of the electronic device 100 is improved. Meanwhile, compared with the structure in which the buffer member 30a is directly disposed between the display screen 20a and the frame 10a, the buffer member 30 is partially disposed in the limiting groove 12, so that the buffer member 30 does not shift when the electronic device 100 falls. In addition, compared with the structure that the buffer member 30a is directly arranged between the display screen 20a and the frame 10a, the contact area between the buffer member 30 and the display screen 20 is smaller in the above structure, and the heat dissipation is facilitated.

Specifically, in an embodiment, the height of the buffer 30 beyond the surface of the frame 10 near the display screen 20 is less than or equal to 0.2 mm. It is understood that the preset height is a height at which the display screen 20 is stacked on the frame 10 and the buffer member 30 has been compressed by the display screen 20. In the case that the display screen 20 is not pressed with the buffer member 30 during the assembling process, the preset height of the buffer member 30 beyond the surface of the frame 10 on the side close to the display screen 20 is within the range of 0.5-0.8 mm.

Referring also to fig. 5, in one embodiment, the position-limiting groove 12 is a groove, and the position-limiting groove 12 includes a notch 122 and a bottom 124, the notch 122 and the bottom 124 are disposed in a pair, and the notch 122 faces the display screen 20. With such a structure, the buffer 30 is partially located in the limiting groove 12, and during the process of assembling the display screen 20 and the frame 10, the buffer 30 is compressed by using the bottom 124 as a carrier. Further, in an embodiment, the thickness of the bottom 124 of the limiting groove 12 is smaller than the predetermined thickness, so as to increase the depth of the limiting groove 12, and further the buffer 30 can be made thicker, thereby providing a larger deformation compression amount. Specifically, in different embodiments, the thickness of the bottom 124 of the limiting groove 12 may be set according to actual conditions, as long as the bottom 124 is not damaged in the process of compressing the buffer 30 by the display screen 20, which is not specifically limited.

In another embodiment, the limiting groove 12 extends through the frame 10, and an adhesive layer 126 is disposed on an area of an inner wall portion of the limiting groove 12 to fix the buffer 30 in the limiting groove 12. With this structure, the cushion member 30 can be made as thick as possible. It can be understood that, in an embodiment, the adhesive layer 126 is disposed on a side of the limiting groove 12 away from the notch 122, so that a portion of the buffering member 30 that is not adhered by the adhesive layer 126 can be deformed under the compression of the display screen 20, and thus, a better buffering and compressing effect can be provided.

In one embodiment, the electronic device 100 further comprises a sensor assembly 50, and it is understood that as technology advances, the screen occupation ratio of the electronic device 100 is increased, and in order to increase the screen occupation ratio, the sensor assembly 50 such as a proximity device is generally disposed under the display screen 20, and light directly penetrates through the display area of the display screen 20. In one embodiment, the frame 10 defines a through slot 14, the sensor assembly 50 is located on a side of the frame 10 away from the display screen 20, and the sensor assembly 50 is at least partially located in the through slot 14 or on a side of the through slot 14 away from the display screen 20. Optionally, in an embodiment, the sensor assembly 50 is located on a side of the through slot 14 away from the display screen 20, i.e., the sensor assembly 50 is disposed opposite the through slot 14. In another embodiment, the sensor assembly 50 is at least partially located within the through slot 14. Specifically, the sensor assembly 50 is connected to the flexible printed circuit board 60, and then connected to a circuit board (not shown) of the electronic device 100 through the flexible printed circuit board 60.

In the technical solution before the structural improvement, the sensor assembly 50a is disposed on a side of the frame 10a away from the display screen 20a, the frame 10a is provided with a through slot 14a, and the sensor assembly 50a is disposed opposite to the through slot 14a, so that light outside the electronic device 100a can pass through the display screen 20a and strike the sensor assembly 50a, or light emitted by the sensor assembly 50a can pass through the display screen 20a, and therefore a through hole 32a needs to be formed in the buffer 30a for the light to pass through. In the scheme before the structural improvement, the buffer member 30a is directly arranged between the display screen 20a and the frame 10a, so that the buffer member 30a is easy to displace when the electronic device 100a is subjected to a drop test or a user drops or even shakes during use; or the size of the through hole in the buffer 30a changes due to temperature changes at high temperature and low temperature, so that the through groove 14a on the frame 10 is shielded by the buffer 30a, and light cannot pass through the through groove 14 a.

In the present application, the buffer member 30 is not disposed in a large area, and most of the buffer member 30 is accommodated in the limiting groove 12 of the frame 10. Therefore, the buffer member will not shift when the electronic device 100 falls, and the through slot 14 is not blocked by the buffer member 30, so that light is difficult to pass through, and normal operation of the sensor assembly 50 is affected. In addition, compared with the structure that the buffer member 30a is directly arranged between the display screen 20a and the frame 10a before improvement, the contact area between the buffer member 30 and the display screen 20 is smaller in the above structure, and heat dissipation is facilitated.

Specifically, in various embodiments, the sensor assembly 50 may include only the proximity device 52 or the light sensing element 54. In other embodiments, the proximity device 52 and the light sensor 54 may be integrated into a two-in-one or three-in-one module, or may be separate components, which is not limited in particular. Further explanation is provided below by way of various examples.

In the embodiment in which the sensor assembly 50 comprises the proximity device 52, the following explains the use of the above solution, including the working principle of the electronic device 100. The functions realized by the scheme at least comprise: in the using process of the electronic device 100, the screen and the using situation of the user are matched, so that the display screen 20 is turned off when the user answers the call, after the display screen 20 is turned off, the light emitted by the sensor assembly 50 firstly passes through the through groove 14, the display screen 20 and the glass cover plate 40, and whether the electronic device is in a non-answering state or not and whether the screen needs to be turned on or not is judged according to the received reflected light.

Specifically, when the user uses the electronic device 100 to place the electronic device 100 at the ear for a call, the screen of the electronic device 100 is close to or contacts the ear or the face, so that the capacitance value in the display screen 20 changes, and when the capacitance value is within the preset range, it indicates that the user is using the electronic device 100 for a call to perform a screen-off operation. It can be understood that when the electronic device 100 is close to the ear and the face, the area of the whole screen close to the face or the ear is relatively large, and when the user is listening to the phone with the earphone or hands-free, if the user only uses the finger to close to or touch the screen to perform other operations besides the call, since the area of the finger close to or touch the screen is significantly smaller than the area of the face or the ear close to or touch the screen when the user holds the electronic device 100 to talk at the ear, the capacitance value in the display screen 20 is in different ranges in the above two cases. Therefore, the screen can be actively turned off only when the user answers the phone by holding the electronic device 100, and the screen can not be turned off when the user touches the screen to perform other operations in other states, such as answering the phone as described above.

And after the screen of the display screen 20 is turned off, the sensor assembly 50 can continuously emit light at a preset time interval, where the light is infrared light, the infrared light sequentially passes through the through groove 14, the display screen 20 and the glass cover plate 40, when a user uses the electronic device 100 to make a call, the infrared light emitted by the sensor assembly 50 is applied to the ear, or the face, or the head of the user, then the infrared light is reflected and then applied to the sensor assembly 50 sequentially passes through the glass cover plate 40, the display screen 20 and the first through groove 14, and the sensor assembly 50 judges whether the user holds the electronic device 100 by hand to make a call at the ear according to the signal-to-noise ratio of the received infrared light. Because the display screen 20 is in close proximity to the user's face or ear while the user is holding the electronic device 100 in the ear, the signal-to-noise ratio of the infrared light reflected back is different from the signal-to-noise ratio of the infrared light received when the electronic device 100 has moved away from the user's ear or face. Therefore, on the premise of implementing the screen-off operation according to the change of the capacitance value of the display screen 20, the operation of turning on the screen is performed by continuously emitting infrared rays and determining whether the electronic device 100 has left the ear or the face of the user according to the signal-to-noise ratio formed by the infrared rays received after the emission.

In the embodiment where the sensor assembly 50 includes the light-sensing element 54, the light-sensing element 54 receives the ambient light outside the cover glass 40, so that the display screen 20 can adjust the brightness of the display screen 20 according to the ambient light sensed by the light-sensing element 54. When the user uses the electronic device 100, the situation that the display screen 20 is dark, the user cannot see the picture on the display screen clearly, or the user needs to feel hard to see the picture on the display screen 20 clearly under the condition that the ambient light is bright is avoided; and avoids the situation that the display screen 20 is abnormally bright when the ambient light is dark, so that the user feels dazzling.

Referring also to FIG. 8, optionally, in one embodiment, the display screen 20 includes a top portion 22, a middle portion 24, and a bottom portion 26, and the projection of the sensor assembly 50 in a direction perpendicular to the display screen 20 is located within the middle portion 24 or the top portion 22 of the display screen 20. The top 22 or middle 24 of the display screen 20 is less likely to be occluded by the user's hand than the bottom 26, and the earpiece of the electronic device 100 is located at the top of the electronic device 100, so that when the user holds the electronic device 100 with their ear, the top 22 or middle 24 of the display screen 20 is more likely to be closer to the face or ear than the bottom of the electronic device 100 is to be closer to the face or ear of the user. Specifically, the projection of the sensor assembly 50 in the direction perpendicular to the display screen 20 may be located at the middle of the top 22 or the middle 24 of the display screen 20 or near the edge, which is not particularly limited.

Referring also to fig. 9, further, in embodiments where the sensor assembly 50 includes the proximity device 52, and the proximity function can be implemented, the specific sensor assembly 50 includes the receiver 56 and the emitter 58, the through slot 14 includes a first slot 142 and a second slot 144 that are independent of each other, the receiver 56 at least partially falls into the first slot 142 along an orthogonal projection perpendicular to the display screen 20, and the emitter 58 at least partially falls into the second slot 144 along an orthogonal projection perpendicular to the display screen 20. So that the light emitted from the emitter 58 can pass through the first slot portion 142, the display 20, and the glass cover 40 to the outside of the electronic device 100 in sequence. The receiver 56 is capable of receiving the reflected light. The light emitted by the specific emitter 58 is infrared light, because the infrared light is invisible to human eyes, the experience of the user can be improved. In other embodiments, the emitter 58 may emit other types of light, or other colors of light.

In another embodiment, the through slot 14 may be only one large slot, and not two slots, respectively, and in this embodiment, the receiver 56 and the transmitter 58 both at least partially fall into the through slot 14 in the orthogonal projection direction perpendicular to the display screen 20. Or the proximity device 52 and the light-sensitive element 54 both fall at least partially into the through slot 14 in an orthographic projection in a direction perpendicular to the display screen 20.

With the above configuration, the buffer member 30 is mostly disposed in the stopper groove 12, and the problem of the sensor element 50a caused by diffraction of infrared light can be solved. With the structure before improvement, after falling or collision, the buffer 30a between the display screen 20a and the frame 10a is easily displaced after being compressed, and at the same time, a gap is easily generated between the display screen 20a and the frame 10a, so that the infrared light emitted by the emitter 58 is easily reflected and refracted for multiple times by using the display screen 20a, the glass cover plate 40a and the gap, and finally diffracted light is incident on the receiver 56, and the infrared light incident on the receiver 56 by diffraction is easily influenced on the sensor assembly 50a to cause misjudgment. In the present application, most of the buffer member 30 is disposed in the limiting groove 12, on one hand, the buffer member 30 will not shift, and on the other hand, the buffer member 30 with such a structure can be made thicker to provide a larger compression amount, and basically, no gap will be generated between the display screen 20 and the frame 10, so that the situation that the sensor assembly 50 is misjudged due to infrared light diffraction is greatly improved.

Optionally, in an embodiment, the limiting groove 12 is ring-shaped and surrounds the through groove 14, as shown in fig. 10 and 11.

Referring to fig. 12, optionally, in embodiments where the through slot 14 includes a first slot portion 142 and a second slot portion 144, the retaining slot 12 is disposed surrounding both the first slot portion 142 and the second slot portion 144. In this embodiment, the limiting groove 12 is a long strip-shaped closed loop, two ends of the limiting groove 12 are arc-shaped, and the limiting groove 12 is located in the middle of the two ends and is linear, i.e., the limiting groove is similar to a track. In other embodiments, the limiting groove 12 may also be a long bar shape or a rectangular ring.

In another embodiment, the limiting groove 12 surrounds one of the first groove portion 142 or the second groove portion 144, as shown in fig. 13.

Alternatively, in other embodiments, the limiting groove 12 may not be disposed around the through groove 14, for example, the limiting groove 12 is disposed adjacent to the through groove 14, as shown in fig. 14, so that the distance between the limiting groove 12 and the through groove 14 is smaller than the preset value.

The specific limiting grooves 12 may be one or more, for example, a plurality of limiting grooves are arranged beside the through groove 14. Or one or both of them enclose the through groove 14, which is not particularly limited.

It is understood that in the embodiment where the position-limiting groove 12 is disposed adjacent to the through groove 14, or only encloses the through groove 14, or encloses the first groove portion 142, or encloses the second groove portion 142, the position-limiting groove 12 is at least one of a circular ring, a rectangular ring, an arc ring, a rectangle, a circle, and a triangle, and may be other shapes, which are not exhaustive and limited.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. An electronic device, comprising:

a display screen;

the display screen is covered on the frame, and the frame is provided with a limit groove;

the buffer part is filled in the limiting groove and exceeds the surface of one side, close to the display screen, of the frame by a preset height;

the frame is provided with a through groove, the sensor assembly is positioned on one side of the frame, which is far away from the display screen, and at least part of the sensor assembly is positioned in the through groove or positioned on one side of the through groove, which is far away from the display screen; the sensor assembly comprises a receiver and a transmitter, the through groove comprises a first groove part and a second groove part which are independent of each other, the receiver at least partially falls into the first groove part along an orthographic projection perpendicular to the display screen direction, and the transmitter at least partially falls into the second groove part along an orthographic projection perpendicular to the display screen direction; the limiting groove is in a ring shape and surrounds the first groove part and the second groove part simultaneously; or the limiting groove surrounds one of the first groove part or the second groove part.

2. The electronic device according to claim 1, wherein the stopper groove is disposed adjacent to the through groove such that a distance between the stopper groove and the through groove is smaller than a preset value.

3. The electronic device according to claim 2, wherein the plurality of limiting grooves surround the through groove.

4. The electronic device of claim 1, wherein the display screen comprises a top portion, a middle portion, and a bottom portion, and wherein a projection of the sensor assembly in a direction perpendicular to the display screen is located within the middle or top portion of the display screen.

5. The electronic device of claim 1, wherein the sensor assembly comprises a receiver and a transmitter, each of which at least partially falls into the channel in an orthographic projection perpendicular to the display screen.

6. The electronic device of claim 1, wherein the buffer comprises at least one of foam or elastic gel.

7. The electronic device of claim 1, wherein the predetermined height is less than or equal to 0.2 mm.

8. The electronic device of claim 1, wherein the limiting groove is a groove, the limiting groove comprises a notch and a bottom, the notch faces the display screen, and the bottom of the limiting groove is thinner than a predetermined thickness so as to increase the depth of the limiting groove.

9. The electronic device according to claim 1, wherein the limiting groove penetrates through the frame, and an adhesive layer is disposed on an inner wall portion of the limiting groove to fix the buffer member in the limiting groove.