Electronic equipment

Abstract

The utility model provides electronic equipment, and belongs to the technical field of electronic terminals, and the electronic equipment comprises a housing, a display screen and a sound transmission structure. Wherein the shell is provided with an internal cavity; the display screen is located on the shell and provided with a first face and a second face, and the second face faces the inner cavity. The sound transmission structure comprises at least one sound outlet hole, and the sound outlet hole is communicated with the inner cavity and located in a gap between the first face of the display screen and the shell. And the rest gap between the first surface and the shell is sealed by a filling piece. In this way, the internal space of the electronic equipment can be reasonably utilized, and the sound output mode of the electronic equipment is improved. By using the directivity characteristic of high frequency, the medium-high frequency sensitivity of the electronic equipment towards one side of the user is improved, so that the user obtains better use experience. Besides, under the condition that the external sound quality effect of the electronic equipment is good, the number of the high-pitch loudspeaker units can be reduced, so that the purpose of reducing the cost is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic terminals, and in particular to an electronic device. Background Art

[0002] With the continuous development of electronic technology, electronic devices have become an indispensable communication tool in people's lives. Electronic devices can be seen everywhere in life and have greatly improved people's living standards. As users' usage needs continue to increase, the performance requirements for electronic devices are also constantly increasing.

[0003] Among them, for large-sized consumer electronic devices, such as tablet computers, users have higher and higher requirements for the external audio effects. The number of speakers used in products is also increasing, and there will be higher requirements in subsequent developments. Generally speaking, the speaker array adopts a high-bass combination, and the signal adopts a frequency division design, which can give full play to the electroacoustic performance of the high-bass speaker unit and reasonably control the power.

[0004] In order to ensure the integrity of the side of the product facing the user, the speaker usually emits sound from the side of the product to ensure a stereo effect. However, due to the good diffraction of low-frequency signals, this method has little effect on the performance of the woofer. But for high-frequency signals, the directivity is relatively strong, and the attenuation is greater in the direction facing the screen, which directly affects the user experience. Utility Model Content

[0005] The present application provides an electronic device, which improves the sound output mode of the electronic device by rationally utilizing the internal space of the electronic device. By utilizing the directional characteristics of high frequencies, the mid-high frequency sensitivity of the electronic device in the direction facing the user is improved, so that the user can obtain a better user experience. In addition, under the condition that the sound quality of the external speaker of the electronic device is good, the number of tweeter units can be reduced, thereby achieving the purpose of reducing costs.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] The present application provides an electronic device, including:

[0008] a housing having an interior cavity;

[0009] A display screen, the display screen is located on the housing, the display screen has a first surface and a second surface, and the second surface faces the internal cavity;

[0010] A sound transmission structure, the sound transmission structure includes at least one sound outlet hole, the sound outlet hole is connected to the internal cavity, and the sound outlet hole is located in the gap between the first surface of the display screen and the housing;

[0011] The remaining gap between the first surface and the housing is sealed by the filling piece.

[0012] Based on the above technical solution, the present application can also be improved as follows.

[0013] In a possible implementation, there are two sound holes, and the width of each sound hole is in the range of 0.15-0.5 mm.

[0014] In a possible implementation, the sound transmission structure further includes: a speaker and a housing;

[0015] The speaker is located in the housing, and both the speaker and the housing are located in the internal cavity;

[0016] The loudspeaker and at least a portion of the inner surface of the shell form a sound transmission cavity, and the sound transmission cavity is a closed structure.

[0017] In a possible implementation, a sound transmission channel is provided at one end of the housing facing the sound outlet;

[0018] The speaker is connected to the sound outlet through a sound transmission channel;

[0019] The width of the sound transmission channel is greater than or equal to 0.5 mm.

[0020] In a possible implementation, the display screen includes two first side portions and two second side portions;

[0021] The two first side portions are arranged opposite to each other, the two second side portions are arranged opposite to each other, and the first side portions are arranged perpendicular to the second side portions;

[0022] Each first side portion and each second side portion are connected to the first surface and the second surface of the display screen.

[0023] In a possible implementation, the two sound outlet holes are respectively opened in the middle of the two first side portions, and the two sound outlet holes are arranged opposite to each other.

[0024] In a possible implementation manner, two sound outlet holes are respectively opened at upper portions of the two first side portions, and the two sound outlet holes are arranged opposite to each other.

[0025] In a possible implementation manner, two sound outlet holes are respectively opened at the lower parts of the two first side parts, and the two sound outlet holes are arranged opposite to each other.

[0026] In a possible implementation, the two sound outlet holes are respectively opened in the middle of the two second side portions, and the two sound outlet holes are arranged opposite to each other.

[0027] In a possible implementation, two sound outlet holes are opened on one of the second side portions, and the two sound outlet holes are arranged in parallel.

[0028] The present application provides an electronic device, which includes a housing, a display screen, and a sound transmission structure. The housing has an internal cavity. The display screen is located on the housing, and the display screen has a first surface and a second surface, and the second surface faces the internal cavity. The sound transmission structure includes at least one sound outlet hole, which is connected to the internal cavity, and the sound outlet hole is located in the gap between the first surface of the display screen and the housing. The remaining gap between the first surface and the housing is sealed by a filler. In this way, the present application can reasonably utilize the internal space of the electronic device and improve the sound output mode of the electronic device. By utilizing the high-frequency directional characteristics, the mid-to-high frequency sensitivity of the electronic device facing the user is improved, so that the user can have a better use experience. In addition, under the condition that the external sound quality of the electronic device is good, the number of tweeter units can be reduced, thereby achieving the purpose of reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A partial structural cross-sectional view of an electronic device provided in one embodiment of the present application;

[0031] Figure 2 A partial enlarged view of an electronic device provided by an embodiment of the present application;

[0032] Figure 3 A structural schematic diagram of a sound outlet position in an electronic device provided in an embodiment of the present application;

[0033] Figure 4 A structural schematic diagram of another sound outlet position in an electronic device provided in an embodiment of the present application;

[0034] Figure 5 A structural schematic diagram of another sound outlet position in an electronic device provided in an embodiment of the present application;

[0035] Figure 6 A structural schematic diagram of another sound outlet position in an electronic device provided in an embodiment of the present application;

[0036] Figure 7 A structural schematic diagram of another sound outlet position in an electronic device provided in an embodiment of the present application;

[0037] Figure 8A structural schematic diagram of another sound outlet position in an electronic device provided in an embodiment of the present application;

[0038] Fig. 9 A simulation curve diagram of different sound output modes of an electronic device provided in an embodiment of the present application and an electronic device in the related art;

[0039] Fig.10 This is a graph showing actual tests of different sound output modes of an electronic device provided in an embodiment of the present application and an electronic device in the related art.

[0040] Description of reference numerals:

[0041] 100- electronic equipment;

[0042] 200-housing;

[0043] 210 - internal cavity;

[0044] 300-display screen;

[0045] 310 - first surface; 320 - second surface; 330 - first side portion; 340 - second side portion;

[0046] 400-sound transmission structure;

[0047] 410 - sound outlet; 420 - speaker; 430 - housing; 440 - speaker module; 450 - sound transmission cavity; 460 - sound transmission channel. DETAILED DESCRIPTION

[0048] As described in the background technology, in order to ensure the integrity of the side of the product facing the user, the speaker usually uses the side of the product to emit sound, thereby ensuring a stereo effect. However, due to the good diffraction of low-frequency signals, this method has little effect on the performance of the woofer. But for high-frequency signals, the directivity is relatively strong, and the attenuation is relatively large in the direction facing the screen, which directly affects the user experience.

[0049] In view of the above technical problems, an embodiment of the present application provides an electronic device, which includes a housing, a display screen and a sound transmission structure. The housing has an internal cavity. The display screen is located on the housing, and the display screen has a first surface and a second surface, and the second surface faces the internal cavity. The sound transmission structure includes at least one sound outlet hole, which is connected to the internal cavity, and the sound outlet hole is located in the gap between the first surface of the display screen and the housing. The remaining gap between the first surface and the housing is sealed by a filler. In this way, the present application can reasonably utilize the internal space of the electronic device and improve the sound output mode of the electronic device. By utilizing the directional characteristics of high frequencies, the mid-to-high frequency sensitivity of the electronic device facing the user is improved, so that the user can have a better user experience. In addition, under the condition that the external sound quality of the electronic device is good, the number of tweeter units can be reduced, thereby achieving the purpose of reducing costs.

[0050] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0051] In the related art, an electronic device may include a housing, a display screen, and a sound transmission structure. The housing and one side of the display screen enclose an internal cavity, and the sound transmission structure is located in the internal cavity. It is understandable that the sound transmission structure may include a sound outlet hole, a sound transmission channel, and a speaker unit. The sound outlet hole is opened on the side of the housing, one end of the sound transmission channel is connected to the speaker unit, and the other end of the sound transmission channel is connected to the sound outlet hole, and the sound waves emitted by the speaker unit are transmitted from the sound outlet hole to the housing along the sound transmission channel.

[0052] However, the electronic devices in the related art may have the following problems in actual use: they have strong directivity for high-frequency signals and reduced decibel sensitivity, resulting in greater attenuation in the direction facing the display screen, which can easily affect the user experience.

[0053] In order to solve the above problems, an embodiment of the present application provides an electronic device, which improves the sound output mode of the electronic device by rationally utilizing the internal space of the electronic device. By utilizing the directional characteristics of high frequencies, the mid- and high-frequency sensitivity of the electronic device in the direction facing the user is improved, so that the user can have a better user experience. In addition, while satisfying the requirement of good external sound quality of the electronic device, the number of tweeter units can be reduced, thereby achieving the purpose of reducing costs. The specific structure of the electronic device provided in the embodiment of the present application is introduced below in conjunction with the accompanying drawings.

[0054] refer to Figure 1 , the embodiment of the present application provides an electronic device 100, it can be understood that the electronic device 100 can be an electronic terminal device such as a mobile phone, a tablet computer, a laptop computer, a smart wearable device, or the electronic device 100 can also be a fixed terminal device such as a smart TV, a router, a server, a switch, etc., and this embodiment does not limit this. In the embodiment of the present application, the electronic device 100 is taken as an example of a tablet computer. Among them, the electronic device 100 may include a housing 200, a display screen 300 and a sound transmission structure 400. Among them, the housing 200 may have an internal cavity 210. It can be understood that the display screen 300 can be located on the housing 200, and the edges of the display screen 300 can be connected to the housing 200. In a possible implementation, the display screen 300 may have a first surface 310 and a second surface 320. Among them, the first surface 310 of the display screen 300 can be set toward the user, and the second surface 320 of the display screen 300 can be facing the internal cavity 210.

[0055] Continue to refer Figure 1 , when the present embodiment is specifically implemented, the sound transmission structure 400 may include a sound outlet hole 410. In a possible implementation, the number of the sound outlet hole 410 may be at least one, and the present embodiment of the application does not limit the number of the sound outlet holes 410. Among them, in the embodiment of the present application, the edges of the display screen 300 and the housing 200 can be designed to have a narrow gap with a certain width, and the sound outlet hole 410 can be located in the gap between the first surface 310 of the display screen 300 and the housing 200, and the sound outlet hole 410 can be connected to the internal cavity 210. In addition, the remaining gap between the first surface 310 and the housing 200 is sealed by a filler. In a possible implementation, the filler can be foam. In this way, the position of the sound outlet hole 410 is located on the side of the first surface 310 of the display screen 300, and the sound outlet direction can be directly toward the user, so that the sound can reach the user directly, obtain a greater sound pressure level, and then improve the loudness.

[0056] Continue to refer Figure 1 , based on the above embodiments, in the embodiments of the present application, the number of sound holes 410 may be two, and the embodiments of the present application take the number of sound holes 410 as two as an example. In one possible implementation, the width of each sound hole 410 may range from 0.15 to 0.5 mm. In this way, it is possible to ensure that the sound is smoothly transmitted from the sound hole 410. Of course, in some other embodiments, the range of the sound hole 410 may be less than or equal to 0.2 mm, so as to ensure the integrity of the display screen 300, and thus not affect the appearance of the entire electronic device 100.

[0057] Continue to refer Figure 1On the basis of the above embodiment, further, the sound transmission structure 400 may also include: a speaker 420 and a housing 430. Among them, the speaker 420 may be located in the housing 430, so that the speaker 420 and the housing 430 can form a speaker module 440. The speaker module 440 may be located in the internal cavity 210 of the housing 200. It can be understood that the speaker module 440 may be located at one end of the electronic device 100, and the speaker module 440 can be used to play audio signals. In the embodiment of the present application, the speaker module 440 may be a small-sized tweeter unit, which serves to reduce the internal space occupied by the electronic device 100, reflecting the miniaturization trend of the electronic device 100. In a possible implementation, the speaker 420 may be surrounded by the inner surface of at least part of the housing 430 to form a sound transmission cavity 450, and the sound transmission cavity 450 may be a closed structure, and the sound transmission cavity 450 may be designed according to the requirements of the standard cavity of the speaker 420 unit. In this way, the directionality of the audio can be effectively improved, the sound quality is purer, and the sound quality loss is reduced.

[0058] Continue to refer Figure 1 On the basis of the above embodiment, in one possible implementation, a sound transmission channel 460 may be provided at one end of the housing 200 facing the sound outlet 410, so that the speaker 420 can be connected to the sound outlet 410 through the sound transmission channel 460. It can be understood that one end of the sound transmission channel 460 is connected to the speaker 420, and the other end of the sound transmission channel 460 is connected to the sound outlet 410. In this way, the sound waves emitted by the speaker 420 can be radiated to the outside of the housing 200 along the sound transmission channel 460 and then through the sound outlet 410. In one possible implementation, the width of the sound transmission channel 460 may be greater than or equal to 0.5 mm, so as to ensure the smoothness of the sound wave transmission.

[0059] Following the reference Figure 1 as well as Figure 2On the basis of the above embodiment, further, the display screen 300 may include a first side portion 330 and a second side portion 340. Among them, the number of the first side portion 330 and the second side portion 340 may be two respectively. In the embodiment of the present application, an example is given with the number of the first side portion 330 and the second side portion 340 being two respectively. The two first side portions 330 are arranged opposite to each other, and correspondingly, the two second side portions 340 may also be arranged opposite to each other, and the first side portion 330 and the second side portion 340 are arranged vertically. It can be understood that each first side portion 330 and each second side portion 340 may be connected to the first surface 310 and the second surface 320 of the display screen 300. In a possible implementation, there may be a narrow gap of a certain width between the first side portion 330 and the housing 200, and correspondingly, there may also be a narrow gap of a certain width between the second side portion 340 and the housing 200. In this way, the sound outlet 410 may be located on the first side portion 330 or the second side portion 340, respectively, so as to achieve different sound outlet positions.

[0060] refer to Figure 3 Based on the above embodiment, in one possible implementation, two sound holes 410 can be respectively opened in the middle of the two first side portions 330, and the two sound holes 410 can be arranged opposite to each other. Based on the geometric center symmetry performance of the electronic device 100, in the embodiment of the present application, the two sound holes 410 can be arranged symmetrically, which not only improves the loudness, but also makes the appearance of the electronic device 100 more beautiful.

[0061] refer to Figure 4 On the basis of the above embodiment, in another possible implementation, two sound holes 410 may be respectively opened at the upper part of the two first side parts 330, and the two sound holes 410 may be arranged opposite to each other. It is understandable that in the embodiment of the present application, the two sound holes 410 may also be arranged symmetrically, which not only improves the loudness, but also makes the appearance of the electronic device 100 more beautiful.

[0062] refer to Figure 5 On the basis of the above embodiment, in another possible implementation, the two sound holes 410 can also be respectively opened at the lower part of the two first side parts 330, and the two sound holes 410 can be arranged opposite to each other. It can be understood that in the embodiment of the present application, the two sound holes 410 can also be arranged symmetrically, which can improve the loudness and also make the electronic device 100 more beautiful from the perspective of appearance.

[0063] refer to Figure 6On the basis of the above embodiment, in another possible implementation, the two sound holes 410 can also be respectively opened in the middle of the two second side portions 340, and the two sound holes 410 can be arranged relative to each other. It can be understood that in the embodiment of the present application, the two sound holes 410 can also be arranged symmetrically, which can improve the loudness and also be more beautiful from the perspective of the appearance of the electronic device 100. Of course, in some other embodiments, the two sound holes 410 can also be respectively opened in other parts of the two second side portions 340, and the two sound holes 410 can be arranged relative to each other.

[0064] refer to Figure 7 as well as Figure 8 On the basis of the above embodiment, in another possible implementation, two sound holes 410 may be opened on one of the second side portions 340, and the two sound holes 410 may be arranged side by side. It is understandable that both the two sound holes 410 may be located on one of the second side portions 340, and the two sound holes 410 may be arranged at intervals on the same second side portion 340. Of course, in another possible implementation, both the two sound holes 410 may be located on another second side portion 340, and the two sound holes 410 may be arranged at intervals on the same second side portion 340.

[0065] It is understandable that the embodiment of the present application does not limit the position and number of the sound outlet holes 410 on the first side portion 330 or the second side portion 340 .

[0066] In the embodiment of the present application, for example, an electronic device in the related art with a sound outlet opening on the side of the housing and the electronic device 100 provided in the embodiment of the present application are compared. Under the condition of using the same tweeter and designing the same volume of the standard sound transmission cavity 450, simulation analysis is performed on the method of opening a sound outlet opening on the side of the housing and the method of setting a sound outlet opening 410 in the narrow gap between the display screen 300 and the housing 200. The simulation results are shown in FIG. Fig. 9 As shown, Fig. 9 The solid line portion in the figure is the sound output mode of the electronic device provided by the present application, and the dotted line portion is the sound output mode of the electronic device in the related art. It can be seen that in the 2-8KHz frequency band, the frequency response of the electronic device 100 provided by the embodiment of the present application is improved by 2-4dB.

[0067] Furthermore, under the same conditions, i.e., using the same tweeter and designing the same volume of the standard sound transmission cavity 450, actual tests were conducted on the method of opening a sound outlet hole on the side of the housing and the method of setting the sound outlet hole 410 in the narrow gap between the display screen 300 and the housing 200. The test results are shown in FIG. Fig.10 As shown, Fig.10 The solid line portion in the figure is the sound output method of the electronic device provided by the present application, and the dotted line portion is the sound output method of the electronic device in the related art. It can be seen that in the frequency band above 2KHz, the frequency response of the electronic device 100 provided by the embodiment of the present application is improved by about 3dB. In summary, the results of the simulation test are consistent with the actual test results, and the sound output method of the electronic device 100 provided by the present application can effectively improve the sensitivity of the sound output method of the electronic device in the related art.

[0068] In the embodiment of the present application, the sound output mode of the electronic device 100 is improved by reasonably utilizing the internal space of the electronic device 100. The high frequency directional characteristics are utilized to improve the mid-high frequency sensitivity of the electronic device 100 in the direction facing the user, so that the user can obtain a better user experience. In addition, if the sound quality of the external speaker of the electronic device 100 is good, the number of tweeter 420 units can be reduced, thereby achieving the purpose of reducing costs.

[0069] In the embodiment of the present application, the sound hole 410 is arranged on a side of the electronic device 100 facing the user, and the size of the sound hole 410 is sufficiently small compared to the sound holes in the electronic device in the related art. While ensuring the loudness of the sound, the electronic device 100 provided in the embodiment of the present application also has a certain waterproof and dustproof effect.

[0070] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0071] It should be noted that the phrases "in specific implementation", "in some embodiments", "in this embodiment", "exemplarily" and the like mentioned in the specification indicate that the described embodiment may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0072] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0073] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0074] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electronic device, characterized in that: include: a housing having an interior cavity; A display screen, the display screen is located on the housing, the display screen has a first surface and a second surface, and the second surface faces the internal cavity; A sound transmission structure, the sound transmission structure comprising at least one sound outlet hole, the sound outlet hole being in communication with the internal cavity, and the sound outlet hole being located in a gap between the first surface of the display screen and the housing; The remaining gap between the first surface and the housing is sealed by a filling piece.

2. The electronic device according to claim 1, characterized in that: The number of the sound outlet holes is two, and the width of each of the sound outlet holes is in the range of 0.15-0.5 mm.

3. The electronic device according to claim 2, characterized in that: The sound transmission structure further includes: a speaker and a housing; The speaker is located in the shell, and the speaker and the shell are both located in the internal cavity; The speaker and at least a portion of the inner surface of the shell form a sound transmission cavity, and the sound transmission cavity is a closed structure.

4. The electronic device according to claim 3, characterized in that: A sound transmission channel is provided at one end of the housing facing the sound outlet; The speaker is connected to the sound outlet through the sound transmission channel; The width of the sound transmission channel is greater than or equal to 0.5 mm.

5. The electronic device according to claim 4, characterized in that: The display screen includes two first side portions and two second side portions; The two first side portions are arranged opposite to each other, the two second side portions are arranged opposite to each other, and the first side portion is arranged perpendicular to the second side portion; Each of the first side portions and each of the second side portions are connected to the first surface and the second surface of the display screen.

6. The electronic device according to claim 5, characterized in that: The two sound outlet holes are respectively opened in the middle of the two first side parts, and the two sound outlet holes are arranged opposite to each other.

7. The electronic device according to claim 5, characterized in that: The two sound outlet holes are respectively opened at the upper parts of the two first side parts, and the two sound outlet holes are arranged opposite to each other.

8. The electronic device according to claim 5, characterized in that: The two sound outlet holes are respectively opened at the lower parts of the two first side parts, and the two sound outlet holes are arranged opposite to each other.

9. The electronic device according to claim 5, characterized in that: The two sound outlet holes are respectively opened in the middle of the two second side parts, and the two sound outlet holes are arranged opposite to each other.

10. The electronic device according to claim 5, characterized in that: The two sound outlet holes are opened on one of the second side parts, and the two sound outlet holes are arranged in parallel.

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