CN215773511U

CN215773511U - Bone conduction earphone

Info

Publication number: CN215773511U
Application number: CN202121616347.0U
Authority: CN
Inventors: 邓家雄
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2022-02-08
Anticipated expiration: 2031-07-15

Abstract

The utility model provides a bone conduction earphone which comprises a bone conduction ear bag, wherein the bone conduction ear bag comprises a shell and transducer assemblies respectively arranged in the shell, and each transducer assembly comprises a fixing ring, a vibration transmission piece, a vibration assembly and a voice coil assembly; the vibration assembly is connected with the fixing ring in a hanging mode through the vibration transmission piece, the voice coil assembly comprises a first circuit board and a coil positioned on the surface of the first circuit board, the first circuit board is fixed on the fixing ring in a mode that the surface where the coil is located faces the vibration assembly, and the coil is electrified to generate a magnetic field to enable the vibration assembly to vibrate; the transducer assembly is mounted in the housing with the vibration assembly facing a side of the housing for contacting a human body, the retainer ring is in contact with an inner wall of the housing, and a gap is provided between the vibration assembly and the inner wall of the housing. The vibration component achieves suspension installation through the vibration transmission piece, effectively ensures the vibration effect, enables the vibration to be more concentrated, has stronger penetrability, improves the tone quality effect, has fewer assembled parts and simplifies the structural design.

Description

Bone conduction earphone

Technical Field

The embodiment of the utility model relates to the technical field of earphones, in particular to a bone conduction earphone.

Background

Bone conduction is a sound conduction mode, namely, sound is converted into mechanical vibration with different frequencies, and sound waves are transmitted through the skull, the bone labyrinth, the lymph fluid transmission of the inner ear, the spiral organ, the auditory nerve and the auditory center of a human body. Because the bone conduction earphone utilizes bone conduction technology to receive the telephone, clings to the bone of the user, the sound wave can be directly transmitted to the auditory nerve through the bone, thereby opening the ears without damaging the tympanic membrane, and being widely loved by consumers.

However, the current bone conduction earphone has insufficient tone quality, the bone conduction ear bag has a complex structure, and the layout design of the parts is unreasonable, so that the assembly process is complicated, and the assembly and disassembly efficiency is low.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a novel bone conduction earphone aiming at the problems of insufficient tone quality, complex structure of a bone conduction ear bag, unreasonable layout design of parts, fussy assembly flow and low disassembly and assembly efficiency of the conventional bone conduction earphone.

The technical solution of the present invention to solve the above technical problems is to provide a bone conduction earphone, including a bone conduction ear bag, where the bone conduction ear bag includes a housing and transducer assemblies respectively mounted in the housing, where the transducer assembly includes a fixing ring, a vibration transmission member, a vibration assembly, and a voice coil assembly;

the vibration assembly is connected with the fixing ring in a hanging mode through the vibration transmission piece, the voice coil assembly comprises a first circuit board and a coil positioned on the surface of the first circuit board, the first circuit board is fixed on the fixing ring in a mode that the surface where the coil is positioned faces the vibration assembly, and the vibration assembly vibrates through a magnetic field generated by electrifying the coil; the transducer subassembly with the vibration subassembly orientation the mode of the one side that is used for contacting the human body of shell is installed in the shell, just gu fixed ring with the inner wall of shell contacts, the vibration subassembly with have the clearance between the inner wall of shell.

Preferably, the bone conduction ear bag comprises a second circuit board, and an electrical signal is accessed through the second circuit board;

the surface of the first circuit board, which is back to the coil, is provided with a plurality of first conductive contacts electrically connected with the coil;

the second circuit board is fixed on one side of the shell far away from the side contacting with the human body, and the surface of the second circuit board facing the side of the shell, which is used for contacting with the human body, is provided with a plurality of second conductive contacts; the second circuit board is connected with the first circuit board in a compression joint mode in a mode that the plurality of second conductive contacts are electrically connected with the plurality of first conductive contacts respectively.

Preferably, each of the first conductive contacts or each of the second conductive contacts has a spring piece thereon, and each of the second conductive contacts is electrically connected to one of the first conductive contacts through the spring piece.

Preferably, the housing comprises a front shell and a rear shell, the front shell comprises a top cover part and a side wall part, and the front shell is fixed with the rear shell through the side wall part; the fixing ring of the energy conversion assembly is in contact with the inner wall of the front shell, and the second circuit board is fixed on the rear shell;

the shell contacts with the human body through the top cover part of the front shell, the outer side surface of the top cover part is provided with an elastic layer formed by secondary injection molding, and the elastic layer extends to the side wall part.

Preferably, the vibration transmission piece is in a circular ring shape and is in a sheet shape, the vibration component is installed and fixed on the inner ring part of the vibration transmission piece, and the outer ring part of the vibration transmission piece is connected with the fixing ring;

the vibration transmission piece is fixedly arranged on the inner ring part of the fixing ring in a tight fit manner; or the vibration transmission piece is fixedly bonded to the inner ring part of the fixing ring; or the vibration transmission piece is fixedly arranged on the inner ring part of the fixing ring in an integrated processing and forming mode.

Preferably, the vibration transmission piece is provided with a plurality of strip-shaped holes which are uniformly distributed along the circumferential direction, and the total area of the strip-shaped holes is larger than or equal to one fourth of the circular area of the vibration transmission piece.

Preferably, the vibration subassembly includes the fixing base, installs with the mode of tight fit locking lid and fixed connection on the fixing base in the response magnet of the bottom of fixing base, the fixing base is including being cylindric main part and locating the flange limit of the lateral surface of main part, just the main part with the adaptation of inner ring portion of piece is shaken in the biography, the fixing base is with the bottom orientation the voice coil loudspeaker voice coil subassembly the main part is worn to establish the inner ring portion of piece is shaken in the biography and the flange limit is pressed and is pasted the mode of piece is shaken in the biography is installed the piece shakes, and the locking lid assembles during the fixing base, the locking lid is pressed and is pasted pass and shake the piece dorsad the surface on flange limit, thereby will the fixing base is spacing to be fixed on the piece is shaken in the biography.

Preferably, the vibration transmitting member is installed to the inner ring portion of the fixing ring in a manner perpendicular to the axial direction of the fixing ring, and the coil is coaxial with the fixing ring when the first circuit board is assembled to the fixing ring, and at least a part of the induction magnet is embedded in a cavity surrounded by the coil when the vibration assembly is fixed to the fixing ring by the vibration transmitting member.

Preferably, one side of the rear shell facing the front shell is provided with at least two protruding fastening structures, the inner side of the side wall portion of the front shell is provided with at least two fastening hook structures adapted to the fastening structures, the front shell is fixedly connected to the rear shell in a manner that the fastening hook structures are fastened to the fastening structures, and when the front shell is assembled to the rear shell, the fastening structures are embedded into a cavity surrounded by the side wall portion.

Preferably, bone conduction earphone hangs subassembly, two functional part, two ear-hang subassemblies and two bone conduction ear bags after including, hang the both ends of subassembly after respectively with two the first end fixed connection of functional part, two the first end fixed connection respectively of ear-hang subassembly is two the second end of functional part, and two bone conduction ear bag fixed connection respectively is two the second end of ear-hang subassembly.

The bone conduction earphone provided by the embodiment of the utility model has the following beneficial effects: by arranging the fixing ring and the vibration transmission piece, the vibration component and the voice coil assembly can be fixed in the shell by the fixing ring and the vibration transmission piece, and the vibration component is mounted in a suspension mode through the vibration transmission piece, so that the vibration effect of the vibration component can be effectively ensured, the vibration is more concentrated, the penetrability is stronger, and the tone quality effect is improved; because the clearance is reserved between the inner wall of vibration subassembly and shell, so can effectively avoid touching and cause the vibration to be weakened to assembly spare part is less, thereby can reduce the volume of bone conduction ear package, simplifies structural design, is favorable to manufacturing.

In addition, above-mentioned bone conduction ear package is through optimizing the overall arrangement design of transducer subassembly and second circuit board for second circuit board and first circuit board can realize electric connection through the mode that second conductive contact meets with first conductive contact, have both improved the rationality of overall arrangement design, need not the assembly cable again, thereby can simplify the assembly flow, improve the convenience of dismouting, and then promote dismouting efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a bone conduction ear bag according to an embodiment of the present invention;

fig. 2 is an exploded view of a bone conduction ear pack according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a cross section of a bone conduction ear bag according to an embodiment of the present invention;

fig. 4 is an exploded view of a vibrating assembly of a bone conduction headset according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a cross section of a vibration assembly of a bone conduction headset according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a bone conduction headset according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Fig. 1 is a schematic structural diagram of a bone conduction ear bag according to an embodiment of the present invention, which can be applied to the field of earphone technology, in particular, to a bluetooth bone conduction earphone.

Referring to fig. 2 and 3, the bone conduction earphone in this embodiment includes a bone conduction ear bag, and the bone conduction ear bag includes a housing 1 and transducer assemblies 2 respectively installed in the housing 1, wherein the transducer assemblies 2 include a fixing ring 21, a vibration transmitting member 22, a vibration assembly 23, and a voice coil assembly 24.

Specifically, the vibration transmission member 22 is fixedly connected to the fixing ring 21, the vibration assembly 23 is fixedly connected to the vibration transmission member 22, and suspension mounting is achieved through the vibration transmission member 22, that is, the vibration assembly 23 is only connected to the vibration transmission member 22 in the housing 1, and the vibration generated by the vibration assembly 23 is transmitted to the fixing ring 21 through the vibration transmission member 22, so that the vibration is prevented from being transmitted to other parts to affect the sound production effect.

Further, the voice coil assembly 24 includes a first circuit board 241 and a coil 242, the coil 242 is fixed on the surface of the first circuit board 241, and the first circuit board 241 is fixed on the fixing ring 21 in a manner that the surface where the coil 242 is located faces the vibration assembly 23, so that a magnetic field generated when the coil 242 is energized can be applied to the vibration assembly 23, and the vibration assembly 23 generates vibration under the action of the alternating magnetic field, thereby implementing a vibration sound generating function.

In particular, the transducer assembly 2 is mounted in the housing 1 in such a way that the vibration assembly 23 faces the side of the housing 1 for contacting the human body, so as to optimize the layout design of the bone conduction ear bag and improve the rationality of the layout design, so that the first circuit board 241 is located on the side of the vibration assembly 23 facing away from the housing 1 for contacting the human body, so as to facilitate the conductive connection of the first circuit board 241. Moreover, the fixing ring 21 is in contact with the inner wall of the housing 1 (for example, can be adhered and fixed to the inner wall of the housing 1 by glue), and a gap is formed between the vibration component 23 and the inner wall of the housing 1, so that the vibration generated by the vibration component 23 is not directly transmitted to the housing 1, but the vibration is transmitted to the inner wall of the housing 1 by the vibration transmitting member 22 and the fixing ring 21, so that the housing 1 vibrates and sounds corresponding to the part contacting with the skin of the human body, and the bone conduction speaker function is achieved.

According to the bone conduction earphone, the fixing ring 21 and the vibration transmission piece 22 are arranged, the vibration component 23 and the voice coil component 24 can be fixed in the shell 1 through the fixing ring 21 and the vibration transmission piece 22, the vibration component 23 is suspended and mounted through the vibration transmission piece 22, the vibration effect of the vibration component 23 can be effectively guaranteed, vibration is concentrated, the penetrability is high, and the tone quality effect is improved; because a gap is reserved between the vibration component 23 and the inner wall of the shell 1, the vibration is effectively prevented from being weakened due to touch, and fewer assembly parts are arranged, so that the volume of the bone conduction ear bag can be reduced, the structural design is simplified, and the processing and the manufacturing are facilitated.

In an embodiment of the present invention, the bone conduction ear bag further includes a second circuit board 3, and the second circuit board 3 is used for accessing electrical signals, that is, the second circuit board 3 can be electrically connected to a main control circuit board and the like outside the housing 1, so that the electrical signals can be introduced into the housing 1. Specifically, the second circuit board 3 is fixed on a side of the housing 1 away from the connection with the human body.

In this embodiment, the surface of the first circuit board 241 facing away from the coil 242 has a plurality of first conductive contacts electrically connected to the coil 242, and the surface of the second circuit board 3 facing the side of the housing 1 for contacting the human body has a plurality of second conductive contacts. In addition, the first circuit board 241 is located on the side of the vibration component 23 opposite to the housing 1 for contacting the human body, so that the first circuit board 241 and the second circuit board 3 are adjacently arranged, and thus the second circuit board 3 can be connected with the first circuit board 241 in a crimping manner by electrically connecting a plurality of second conductive contacts with a plurality of first conductive contacts respectively, thereby realizing the electrical connection between the first circuit board 241 and the second circuit board 3. At the same time, the second circuit board 3 may press-fit the transducer assembly 2.

Above-mentioned bone conduction ear package is through optimizing the overall arrangement design of transducer subassembly 2 and second circuit board 3 for second circuit board 3 and first circuit board 241 can realize electric connection through the mode that second conductive contact meets with first conductive contact, have both improved the rationality of overall arrangement design, need not the assembly cable again, thereby can simplify the assembly flow, improve the convenience of dismouting, and then promote dismouting efficiency.

Furthermore, each first conductive contact or each second conductive contact has a spring 31 thereon, and each second conductive contact is electrically connected to one first conductive contact through the spring 31. Above-mentioned bone conduction ear package not only can improve the connection stability between first conductive contact and the second conductive contact through setting up shell fragment 31 for electric connection between first circuit board 241 and the second circuit board 3 is difficult to the disconnection, can also the greatly reduced assembly error requirement, reduces the assembly degree of difficulty, thereby improves the convenience of assembly operation, improves the packaging efficiency. In practical applications, the elastic sheet 31 is preferably disposed on the second conductive contact, which is beneficial for assembly operation, and can efficiently make the elastic sheet 31 correspondingly press-connected to the first conductive contact of the first circuit board 241.

In another embodiment of the present invention, the housing 1 includes a front shell 11 and a rear shell 12, the front shell 11 includes a top cover portion 111 and a side wall portion 112, and the front shell 11 is fixed to the rear shell 12 through the side wall portion 112. The fixed ring 21 of the transducer assembly 2 contacts with the inner wall of the front shell 11, that is, the housing 1 contacts with the human body through the front shell 11, and the vibration assembly 23 drives the front shell 11 to vibrate and generate sound through the vibration transmission member 22 and the fixed ring 21 when generating vibration. To avoid affecting the vibration effect, the second circuit board 3 should be fixed on the rear case 12 to reduce the load of the front case 11, which is beneficial to enhance the vibration transmission capability.

Specifically, the housing 1 contacts with the human body through the top cover part 111 of the front housing 11, the outer side surface of the top cover part 111 has the elastic layer 113 formed by two-shot molding, and the elastic layer 113 extends to the side wall part 112, i.e. the front housing 11 and the skin of the human body are in soft contact through the elastic layer 113, so that the use comfort can be improved. Above-mentioned elastic layer 113 processes the lateral surface to top cap portion 111 through secondary injection molding process, and not only processing is convenient, can also effectively improve the joint strength between the lateral surface of elastic layer 113 and top cap portion 111, improves structural stability and reliability.

In one embodiment of the present invention, the vibration transmitting member 22 is a circular ring-shaped plate to be fitted into the inner ring portion of the fixing ring 21, so that the vibration transmitting member 22 can be fixed to the inner ring portion of the fixing ring 21. In practical application, the fixing connection mode between the vibration transmission piece 22 and the fixing ring 21 can be determined according to practical situations; for example, the vibration transmitting member 22 is fixed to the inner ring portion of the fixing ring 21 in a tight-fitting manner; alternatively, the vibration transmitting member 22 is fixed to the inner ring portion of the fixed ring 21 by bonding; alternatively, the vibration transmitting member 22 is fixed to the inner ring portion of the fixing ring 21 by integral molding.

In particular, it is preferable that a step surface adapted to the vibration transmitting member 22 is provided in the inner ring portion of the fixed ring 21, and the step surface is perpendicular to the vertical direction of the fixed ring 21, so that the vibration transmitting member 22 can be restrained by the step surface, the assembling accuracy of the vibration transmitting member 22 is improved, and the vibration transmitting effect of the vibration transmitting member 22 is ensured.

Further, the inner ring portion (i.e., the inner annular bore) of the vibration transmitting member 22 is adapted to the vibration member 23, so that the vibration member 23 can be fixed to the vibration transmitting member 22 by being mounted to the inner ring portion of the vibration transmitting member 22, and can be mounted in a suspended manner.

In order to enhance the vibration transmission capability of the vibration transmission member 22, it is preferable that the vibration transmission member 22 is provided with a plurality of strip-shaped holes 221 uniformly distributed along the circumferential direction, so as to improve the elastic force of the vibration transmission member 22 and reduce the vibration transmission resistance, and the plurality of strip-shaped holes 221 are uniformly distributed along the circumferential direction to ensure that the vibration transmission member 22 is a central symmetric structure. In practical applications, the total area of the plurality of bar-shaped holes 221 is preferably greater than or equal to one fourth, for example two fifths, of the circular annular area of the vibration transfer member 22.

As shown in fig. 4, the vibration assembly 23 includes a fixing base 231, a locking cover 232, and a sensing magnet 233 (e.g., a magnet), wherein the locking cover 232 is mounted on the fixing base 231 in a tight-fitting manner (of course, the locking cover 232 may also be integrally assembled with the fixing base 231 in other manners, such as a snap fit, a threaded connection, etc.), and the sensing magnet 233 is fixedly connected to the bottom of the fixing base 231.

Specifically, the fixing seat 231 of the present embodiment includes a cylindrical main body portion 2311 and a flange 2312 disposed on an outer side surface of the main body portion 2311, and the main body portion 2311 is fitted with the inner ring portion of the vibration transmission member 22, and when the vibration assembly 23 is assembled on the vibration transmission member 22, the bottom of the fixing seat 231 faces the voice coil assembly 24 (i.e., the induction magnet 233 is located on a side of the fixing seat 231 facing the voice coil assembly 24), the main body portion 2311 of the fixing seat 231 penetrates through the inner ring portion of the vibration transmission member 22, and the flange 2312 is pressed against the surface of the vibration transmission member 22. And, when the locking cover 232 is assembled to the fixing seat 231, the locking cover 232 is pressed against the surface of the vibration-transmitting member 22 facing away from the flange 2312, so that the locking cover 232 and the flange 2312 are respectively limited to the two side surfaces of the vibration-transmitting member 22 to limit and fix the fixing seat 231 on the vibration-transmitting member 22. The structure is simple, tools are not needed, the structural design can be simplified, the assembly and disassembly are facilitated, and the practicability is high.

As shown in fig. 5, the vibration transmission member 22 is mounted on the inner ring portion of the fixing ring 21 in a manner perpendicular to the axial direction of the fixing ring 21, and the coil 242 is coaxial with the fixing ring 21 when the first circuit board 241 is assembled to the fixing ring 21, and when the vibration assembly 23 is fixed to the fixing ring 21 by the vibration transmission member 22, at least a portion of the induction magnet 233 is embedded in the cavity enclosed by the coil 242, so that the induction magnet 233 can generate vibration under the action of the magnetic field generated by energizing the coil 242, and the bone conduction function is ensured.

The rear shell 12 is provided with at least two protruding fastening structures 121 on one side facing the front shell 11, the inner side of the side wall portion 112 of the front shell 11 is provided with at least two hook structures 114 adapted to the fastening structures 121, and the front shell 11 is fixedly connected to the rear shell 12 by hooking the fastening structures 114 to the fastening structures 121, so that the connection is firm and reliable, and the dismounting operation is facilitated. Moreover, when the front shell 11 is assembled to the rear shell 12, the snap structure 121 is embedded into the cavity enclosed by the side wall part 112, so as to avoid affecting the appearance of the appearance and improve the rationality of the structural design.

As shown in fig. 6, the bone conduction earphone includes a rear-hanging component 4, two functional portions 51, two ear-hanging components 6 and two bone conduction ear bags, wherein two ends of the rear-hanging component 4 are respectively and fixedly connected to first ends of the two functional portions 51, first ends of the two ear-hanging components 6 are respectively and fixedly connected to second ends of the two functional portions 51, and the two bone conduction ear bags are respectively and fixedly connected to second ends of the two ear-hanging components 6. Of course, in practical applications, the structural design of the bone conduction earphone may be specifically determined according to practical situations, for example, a monaural structure.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A bone conduction earphone is characterized by comprising a bone conduction ear bag, wherein the bone conduction ear bag comprises a shell and transducer assemblies respectively arranged in the shell, wherein the transducer assemblies comprise fixing rings, vibration transmission pieces, vibration assemblies and voice coil assemblies;

2. The bone conduction headset of claim 1, wherein the bone conduction ear bud comprises a second circuit board and electrical signals are accessed through the second circuit board;

3. The bone conduction headset of claim 2, wherein each of the first conductive contacts or each of the second conductive contacts has a spring, and each of the second conductive contacts is electrically connected to one of the first conductive contacts through the spring.

4. The bone conduction headset of claim 2 or 3, wherein the housing comprises a front shell and a rear shell, the front shell comprising a top cover portion and sidewall portions, and the front shell being secured to the rear shell by the sidewall portions; the fixing ring of the energy conversion assembly is in contact with the inner wall of the front shell, and the second circuit board is fixed on the rear shell;

5. The bone conduction earphone according to claim 1, wherein the vibration transmission member is in the shape of a circular ring plate, and the vibration assembly is fixedly mounted on the inner ring portion of the vibration transmission member, and the outer ring portion of the vibration transmission member is connected with the fixing ring;

6. The bone conduction earphone according to claim 1 or 5, wherein the vibration transmission member is provided with a plurality of strip-shaped holes uniformly distributed along the circumferential direction, and the total area of the plurality of strip-shaped holes is greater than or equal to one quarter of the circular area of the vibration transmission member.

7. The bone conduction headset of claim 5, wherein the vibration assembly includes a fixing base, a locking cover mounted on the fixing base in a tight-fitting manner, and an induction magnet fixedly connected to the bottom of the fixing base, the fixing base includes a cylindrical main body portion and a flange edge disposed on an outer side surface of the main body portion, the main body portion is adapted to the inner ring portion of the vibration transmission member, the fixing base faces the voice coil assembly with the bottom, the main body portion penetrates through the inner ring portion of the vibration transmission member, and the flange edge is pressed against the inner ring portion of the vibration transmission member, and the vibration transmission member is mounted in a manner that the flange edge is pressed against the vibration transmission member, and when the locking cover is mounted on the fixing base, the locking cover is pressed against the surface of the vibration transmission member facing away from the flange edge, so that the fixing base is fixed on the vibration transmission member in a limiting manner.

8. The bone conduction earpiece of claim 7, wherein the vibration transmitter is mounted to the inner ring portion of the fixation ring perpendicular to an axial direction of the fixation ring, and the coil is coaxial with the fixation ring when the first circuit board is assembled to the fixation ring, and at least a portion of the induction magnet is embedded within a cavity enclosed by the coil when the vibration assembly is fixed to the fixation ring by the vibration transmitter.

9. The bone conduction headset of claim 4, wherein the side of the rear housing facing the front housing is provided with at least two protruding fastening structures, the inner side of the side wall of the front housing is provided with at least two hook structures adapted to the fastening structures, the front housing is fixedly connected to the rear housing by hooking the hook structures to the fastening structures, and the fastening structures are embedded in a cavity enclosed by the side wall when the front housing is assembled to the rear housing.

10. The bone conduction headset of claim 1, wherein the bone conduction headset comprises a rear-hanging component, two functional portions, two ear-hanging components and two bone conduction ear bags, two ends of the rear-hanging component are respectively and fixedly connected with first ends of the two functional portions, first ends of the two ear-hanging components are respectively and fixedly connected with second ends of the two functional portions, and the two bone conduction ear bags are respectively and fixedly connected with second ends of the two ear-hanging components.