JP4437437B2 - Mobile communication terminal - Google Patents

Description

  The present invention relates to a mobile communication terminal such as a foldable mobile phone, and more particularly to an improvement of a mobile communication terminal that can be folded with a display surface facing outward. In particular, the present invention relates to a portable communication terminal that can effectively emit stereo reproduction sound in which a sound image is three-dimensional even when the terminal is folded.

  Mobile phones are required to be smaller and lighter from the viewpoint of improving portability. However, considering the operability, there is a limit to downsizing the operation panel composed of a large number of operation keys. In addition, the screen size of the main display surface is required to be increased. In order to reconcile such conflicting demands, in recent mobile phones, a display case provided with a display surface consisting of a main display and an operation case provided with an operation surface are connected by a hinge so that the display surface and operation The mainstream is one that can be folded with its faces facing each other.

  Further, by using not only the first rotating shaft for folding but also the two-axis hinge having the second rotating shaft orthogonal to the first rotating shaft, the display surface can be folded outward and the operation surface can be folded inward. Conventionally, a portable telephone set has been proposed (for example, Patent Document 1). Such a foldable mobile phone is very convenient because if you fold it with the main display on the outside, you can browse the display screen of the main display even though it is folded and the terminal is stored compactly It is.

  In recent years, there has been proposed a mobile phone that is provided with two speakers in a housing and can output stereo reproduction sound of two channels. However, when such a cellular phone is to be folded as described above, there is a problem that it becomes difficult to hear stereo reproduction sound emitted from each speaker depending on the terminal state. That is, in a state where the display surface is folded inward, the opening provided in the display panel for releasing the output sound from each speaker is blocked by the operation casing, so that it is difficult to hear the reproduced sound. There was a problem.

  In Patent Document 2, an opening is provided in each of a display panel having a display surface in a display housing and a back panel facing the display surface, and a speaker is arranged for each opening, thereby displaying the display housing. A foldable mobile phone is described in which the received sound can be heard from either the surface side or the opposite side.

Therefore, it is conceivable to provide two sets of such speakers for outputting stereo playback sound so that the stereo playback sound can be easily heard even when the display surface is folded inward. . However, since the number of speakers required to output stereo reproduction sound is doubled, there are problems that the manufacturing cost increases and the thickness of the display housing increases.
JP 2002-171189 A JP 2002-118633 A

  As described above, the conventional foldable mobile phone has a problem that it is difficult to hear the stereo reproduction sound emitted from each speaker depending on the terminal state. In addition, since the number of speakers required for outputting stereo reproduction sound is doubled, there is a problem that the manufacturing cost and the thickness of the display housing increase.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a mobile communication terminal that can always listen to stereo reproduction sound satisfactorily regardless of the state of the terminal. In particular, it is an object of the present invention to provide a mobile communication terminal that does not make it difficult to hear stereo reproduction sound emitted from each speaker even when the display surface is folded inward.

  Another object of the present invention is to provide a portable communication terminal capable of improving the sound quality of stereo reproduction sound output from each speaker without increasing the thickness of the display housing or increasing the size of the display housing. There is to do. Another object of the present invention is to provide a mobile communication terminal that can appropriately output stereo reproduction sound according to the terminal state and has improved operability.

A mobile communication terminal according to the present invention is a thin display housing having a display surface on one main surface, an operation housing having an operation surface made up of a large number of operation keys, and the display housing and the operation housing can be folded. In a mobile communication terminal comprising a connecting portion to be connected, two speakers are provided in the display housing and arranged along the display surface with the vibration surface facing the display surface, and an end surface of the display housing. , Two openings for reproducing sound output provided respectively on the two opposing end surfaces and communicating with the respective speakers, and provided in the display casing, and formed for each speaker on the front side of the vibration surface of each speaker. And two communication passages for communicating the output space of the reproduced sound to each of the openings. The display housing is composed of a liquid crystal panel on the display surface. Portions are arranged with overlapping the formation area of the liquid crystal panel, constructed as described above output space to the non-overlapping portion of the formation area of the liquid crystal panel is formed.

With such a configuration, since the openings for reproducing sound output are respectively provided on the two opposite end faces of the display housing, the stereo reproduced sound can always be heard satisfactorily regardless of the state of the terminal. In particular, even in a terminal state where the display surface is on the inside, the opening that communicates with the speaker is not blocked by the operation housing, so it is difficult to hear the stereo playback sound emitted from each speaker. Can be prevented. Further, by arranging each speaker so as to overlap with the formation region of the liquid crystal panel, the length in the direction perpendicular to the arrangement direction of the speakers in the display housing can be shortened. Furthermore, by disposing the vibration surface of each speaker toward the display surface in the display housing, the thickness of the display housing can be reduced compared to disposing the vibration surface toward the end surface. At that time, stereo playback sound from each speaker is emitted from the openings provided on the two opposing end faces through the communication path communicating with the output space of the playback sound formed on the front side of the speaker, so that stereo playback Sound can be effectively propagated around the terminal. Moreover, since the output space is formed in a non-overlapping portion with the liquid crystal panel, the size of each speaker is increased without increasing the length of the display casing in the direction perpendicular to the arrangement direction and the thickness of the display casing. Can be Therefore, it is possible to improve the quality of stereo playback sound output from each speaker without increasing the size of the display housing.

  In addition to the above-described configuration, the mobile communication terminal according to the present invention is configured such that the speakers are provided closer to the connecting portion than the display surface of the display housing. According to such a structure, it can suppress that the length of the arrangement direction of each speaker in a display housing | casing increases.

The mobile communication terminal according to the present invention, in addition to the above configuration, the upper SL each output space and the communication passage is configured to both be formed to be inclined toward the wall surface on the opening side. According to such a configuration, the thickness of the display housing is reduced by disposing the vibration surface of each speaker toward the display surface in the display housing, as compared with the case where the vibration surface is disposed toward the end surface. Can be At that time, stereo playback sound from each speaker is emitted from the openings provided on the two opposing end faces through the communication path communicating with the output space of the playback sound formed on the front side of the speaker, so that stereo playback Sound can be effectively propagated around the terminal.

  In addition to the above configuration, the mobile communication terminal according to the present invention includes a metal frame in which a liquid crystal panel as the display surface is disposed on the front surface, and the speakers are disposed on the connection portion side of the liquid crystal panel on the rear surface. A sound insulation wall disposed on the back side of the metal frame in the display housing; and a back side of the metal frame in the display housing and on the back side of the liquid crystal panel; An acoustic space that communicates with the speaker wall, the speaker wall formed on a straight line connecting the speakers, one end connected to the speaker wall, and the other end extended to the back side of the liquid crystal panel. It is comprised from the extending | stretching part.

  By constituting the sound insulation wall by the speaker wall portion and the extending portion, it is possible to suppress the reproduction sound emitted from the back surface of one speaker from propagating to the other speaker side. At that time, since the acoustic space formed on the back side of the liquid crystal panel communicates with the back side of each speaker, the reproduced sound can be propagated to the acoustic space. Accordingly, the reproduced sound is sufficiently diffused in the acoustic space, and the diffusion area of the reproduced sound on the back side of each speaker can be expanded, so that the sound pressure of the reproduced sound can be improved.

  In addition to the above-described configuration, the mobile communication terminal according to the present invention is in a normally closed state in which the display surface and the operation surface are opposed to each other, and is normally open in which both housings are expanded with the display surface and the operation surface facing in the same direction. It is possible to change the state and the reverse closed state where the display surface is folded outward, and the reverse open state where both housings are expanded with the display surface and the operation surface facing in the opposite direction is the normal open state and reverse closed state A mobile communication terminal that is routed in a transition process between states, a terminal state identification unit that identifies which state the terminal is in, a terminal state storage unit that stores the identification result of the terminal state, and the terminal is reversely opened Speaker driving control means for driving each speaker based on the immediately preceding terminal state and outputting stereo playback sound consisting of left and right channels when in the state. Composed of Te.

  With such a configuration, the terminal state identification result is stored, and the reverse open state in which the left and right channels in the stereo playback sound are switched based on the previous terminal state is passed through the transition process between the normal open state and the reverse close state. Therefore, each speaker can be driven by appropriately switching the left and right channels according to the transition path of the terminal state.

  Specifically, when the speaker drive control means transitions from the normal open state to the reverse open state, and when transitioning from the reverse close state to the reverse open state, each of the speaker drive control means does not switch the channel before and after the state transition. Configured to drive a speaker. According to such a configuration, it is possible to prevent the left and right channels from being switched due to an erroneous operation, so that operability can be improved.

  In addition to the above configuration, the mobile communication terminal according to the present invention assigns channels to each speaker on the display surface of the display housing in accordance with the switching of the left and right channels in the stereo playback sound output from the speakers. It comprises channel assignment display means for screen display.

  In particular, when the terminal changes from the reverse open state to the reverse close state and when the terminal changes from the reverse open state to the normal open state, the channel assignment display means performs channel assignment until a predetermined period elapses from the state transition. It is configured to display on the screen. According to such a configuration, the channel assignment for each speaker is displayed on the screen according to the switching of the left and right channels, so that the terminal operator can correctly recognize the left and right channels in the stereo playback sound emitted from each speaker. Can do. In particular, when the left and right channels are switched due to the transition of the terminal state, the channel assignment is displayed on the screen until a predetermined period elapses from the state transition, which is effective for calling attention.

  In addition to the above configuration, the mobile communication terminal according to the present invention adds a signal having different phase characteristics to the audio signal composed of the left and right channels, and performs signal processing to three-dimensionalize the sound image in the stereo reproduction sound by each speaker. It is comprised with a means.

  According to the mobile communication terminal of the present invention, it is possible to always listen to stereo reproduction sound satisfactorily regardless of the state of the terminal. In particular, even in the normally closed state where the display surface is on the inside, each opening that communicates with the speaker is not blocked by the operation casing, so that the stereo playback sound emitted from each speaker can be heard. It can prevent becoming difficult.

  In addition, since the size of each speaker can be increased without increasing the length of the display casing in the direction perpendicular to the arrangement direction of the speakers and the thickness of the display casing, the display casing is increased in size. Therefore, it is possible to improve the sound quality of the stereo reproduction sound output from each speaker. In addition, since each speaker is driven by switching the left and right channels appropriately according to the transition path of the terminal state, it is possible to output stereo playback sound appropriately and to prevent the left and right channels from being switched due to an erroneous operation. And the operability of the terminal can be improved.

Embodiment 1 FIG.
FIGS. 1A and 1B are plan views showing a configuration example of a mobile communication terminal according to Embodiment 1 of the present invention. FIG. 1A shows a display surface 5 and an operation surface 6. FIG. 1B shows a normal open state in which the display surface 5 and the operation surface 6 are folded inward. FIG. 2 (a) and 2 (b) are plan views showing an example of the terminal state in the mobile communication terminal of FIG. 1, and FIG. 2 (a) shows the display surface 5 and the operation surface 6 in opposite directions. The reverse open state expanded toward is shown, and FIG. 2B shows the reverse close state in which the display surface 5 is folded outward.

  A mobile communication terminal 1 according to the present embodiment is a foldable mobile phone having a so-called rotary clamshell mechanism, and includes a display housing 2 having a display surface 5, an operation housing 3 having an operation surface 6, It consists of the connection part 4 which connects a housing | casing so that folding is possible.

  The display housing 2 is a thin box (casing), and of two opposing main surfaces, one main surface is a display panel and the other main surface is a back panel. The display panel is provided with a display surface 5 composed of a liquid crystal panel as a main display, and two reception sound holes 7a and 7b for receivers. Each of the reception sound holes 7a and 7b is disposed at both ends in the longitudinal direction of the display housing 2 with the display surface 5 interposed therebetween. That is, each of the reception sound holes 7 a and 7 b is disposed on the connecting portion 4 side on the display panel of the display housing 2 and on the opposite side to the connecting portion 4.

  A sub-display 19 having a display screen smaller than that of the main display is provided on the rear panel.

  The operation housing 3 is a box having the same shape as the display housing 2. On one main surface (front surface), an operation surface 6 including various operation keys and a microphone (voice input element) 8 for transmission are provided. And are provided. As various operation keys, a shooting mode key 12, a telephone directory search mode key 13, a direction key 14, an on-hook key 15, an off-hook key 16, a number key, and the like are provided. The microphone 8 is disposed at an end portion in the longitudinal direction of the operation housing 3 with the operation surface 6 sandwiched from the connecting portion 4. That is, the microphone 8 is disposed on the side opposite to the connecting portion 4.

  On the other main surface (back surface) of the operation casing 3, a digital camera including an image sensor is provided. A side key 17 is provided on the right side surface of the operation housing 3 for performing a shutter operation when photographing with the digital camera, and a side key for performing a call operation and a response operation at the time of incoming call is provided on the left side surface. 18 is provided.

  The connecting portion 4 is composed of a biaxial hinge 9 having two rotation axes 10 and 11 that are orthogonal to each other, and is connected to the display housing 2 by a rotation axis (first rotation axis) 11 that is parallel to the intersection line of the display surface 5 and the operation surface 6. The operation casing 3 is connected to be openable and closable, and both casings are rotatably connected by a rotation axis (second rotation axis) 10 parallel to the longitudinal direction of the display casing 2. The rotation shaft 11 is disposed along the distal end surface in the longitudinal direction of the operation housing 3, and the rotation shaft 10 is disposed at the center position in the short direction of the display housing 2.

  With this connecting portion 4, both the housings are unfolded with the display surface 5 and the operation surface 6 facing each other in a folded state (hereinafter referred to as “normally closed state”) and the display surface 5 and the operation surface 6 facing the same direction. Terminal state (hereinafter referred to as “normally open state”), terminal state where both housings are expanded with the display surface 5 and the operation surface 6 facing in opposite directions (hereinafter referred to as “reverse open state”), and the display surface 5 facing outward. The terminal state folded toward the terminal (hereinafter referred to as reverse closed state) can transition. In other words, in the transition process between the normal open state and the reverse close state, the reverse open state is always passed.

  The display housing 2 of such a mobile communication terminal 1 is provided with two speakers 20a and 20b for outputting stereo reproduction sound. Each of the speakers 20a and 20b is an audio output element provided in the display housing 2, and is disposed with the vibration surface facing the display surface 5 side. That is, the speakers 20 a and 20 b are arranged so that the front direction of the speakers 20 a and 20 b is directed toward the display surface 5 and the vibration surface is parallel to the display surface 5. By disposing the vibration surface of the speaker toward the display surface 5 in the display housing 2, the thickness of the display housing 2 can be made thinner than when the vibration surface is disposed toward the end surface. .

  The speakers 20 a and 20 b are arranged along the display surface 5 and attached to the display housing 2 at positions closer to the connecting portion 4 than the display surface 5. That is, each of the speakers 20a and 20b is arranged along one end of the display surface 5 on the connecting portion 4 side so that a part thereof overlaps with the liquid crystal panel formation region. By arranging the speakers so as to overlap the formation area of the liquid crystal panel, the length in the direction perpendicular to the arrangement direction of the speakers 20a and 20b in the display housing 2 can be shortened. Note that the arrangement direction of the speakers 20 a and 20 b is parallel to the lateral direction of the display housing 2, that is, the rotation axis 11.

  The speakers 20a and 20b communicate with the two openings 22a and 22b through the communication path 21, respectively. Each of the openings 22a and 22b is a sound hole for stereo reproduction sound output provided on two opposite end faces of the display housing 2. Since the opening for reproducing sound output is provided on each of the opposing end faces of the display housing 2, stereo reproduced sound can always be heard satisfactorily regardless of the state of the terminal. In particular, even in the normally closed state in which the display surface 5 is on the inside, the openings 22a and 22b communicating with the speakers are not blocked by the operation housing 3, and thus are emitted from the speakers 20a and 20b. It is possible to prevent the stereo playback sound from becoming difficult to hear.

  The communication path 21 is an audio propagation path that ventilates the output space of the reproduced sound formed on the front side of the vibration surface of the speaker to the external space. Both the output space and the wall surface of the communication path 21 are formed to be inclined toward the opening side. That is, the communication path 21 becomes wider as it approaches the opening from the speaker. Specifically, of the two opposing wall surfaces perpendicular to the display surface 5 in the communication path 21, the wall surface on the display surface 5 side is parallel to the short side of the display surface 5 and is opposite to the display surface 5. The side wall surface is an inclined surface that is inclined toward the side surface side of the display housing 2.

  Since the horn structure is formed by the communication path 21 having such an inclined wall surface and the output space, it is possible to improve the radiation efficiency of the reproduced sound by the speakers 20a and 20b. Here, in the normal open state, the speaker disposed on the right side when the display housing 2 is viewed from the display surface 5 side is referred to as the right speaker 20a, and the speaker disposed on the left side is referred to as the left speaker 20b.

  3A to 3D are state transition diagrams showing an example of a terminal state in the mobile communication terminal of FIG. 1, and FIG. 3A shows a state of a normally closed state. (B) shows the state of the normally open state. FIG. 3C shows the reverse open state, and FIG. 3D shows the reverse close state.

  The normally closed state is a state in which both housings are closed while the display panel surface 5a and the operation panel surface 6a are opposed to each other, that is, a state in which the housing is stored, and the terminal is in a standby mode. When both housings are opened from the normally closed state, the normally opened state is obtained.

  In the normal open state, a call operation by the off-hook key 16, a response operation at the time of an incoming call, a call, a shooting operation by the digital camera 23, an e-mail editing operation, a received e-mail browsing operation, a phone book search operation, etc. are performed. Is called. When making a call or receiving a call, the entered destination telephone number, caller number, etc. are displayed on the main display. At the time of shooting, the shot image is displayed as a viewfinder on the main display.

  In such a normal open state, a call is performed using the reception sound hole 7a. When the display housing 2 is rotated 180 degrees around the rotation axis 10 with respect to the operation housing 3 from the normal open state, the reverse open state is established.

  In the reverse open state, the rear surface of the operation housing 3 is directed to the terminal operator side, and self-photographing with the side key 17 is performed (self-portrait mode). If both housings are closed with the display panel 5a facing outward from the reverse open state, the reverse close state is established.

  In the reverse closed state (also referred to as a viewer style state), an outgoing operation by the side key 18, a response operation at the time of an incoming call, a call, a photographing operation, a browsing operation at the time of mail reception, and the like are performed. In this reverse closed state, a call is performed using the reception sound hole 7b. Since the reception sound hole 7b is located farthest from the microphone 8 in the reverse closed state, it is possible to make a call appropriately.

  FIG. 4 is a cross-sectional view showing an example of the details of the main part of the mobile communication terminal of FIG. 1, and shows the inside of the display housing 2 cut along line A1-A1. FIG. 5 is a plan view showing an example of the details of the main part of the mobile communication terminal of FIG. 1, and the metal frame 26 provided in the display housing 2 is viewed from the side opposite to the display panel 5a. It is shown. FIG. 6 is a cross-sectional view of the metal frame of FIG. 5 taken along line A2-A2.

  A metal frame 26 is mounted in the display housing 2 in order to improve the rigidity of the housing. The metal frame 26 is made of a lightweight metal member such as magnesium, and the liquid crystal panel 31 and the speakers 20a and 20b are respectively arranged. The liquid crystal panel 31 is disposed on the front side of the metal frame 26, that is, the display panel 5a side, and the speakers 20a and 20b are disposed on the back side. The metal frame 26 holds the speakers 20 a and 20 b closer to the connecting portion 4 than the liquid crystal panel 31.

  Each of the speakers 20a and 20b includes a disc-shaped diaphragm 24 that generates a reproduced sound and a drive unit 25 that drives the diaphragm 24. A part of the diaphragm 24 overlaps a region where the liquid crystal panel 31 is formed. Be placed. Here, it is assumed that one half of the diaphragm 24 is arranged so as to overlap with the formation region.

  In the metal frame 26, the above-described reproduced sound output space 27 is formed in association with the non-overlapping portions of the speakers 20a and 20b with the liquid crystal panel 31. This output space 27 is formed for each speaker.

  In general, in order to effectively emit reproduced sound from a speaker, it is necessary to provide an output space, that is, a hollow region on the front side of the diaphragm. If such a hollow region is provided in the region where the liquid crystal panel 31 is formed, the liquid crystal panel 31 must be moved forward and the thickness of the display housing 2 is increased. On the other hand, as described above, the output space 27 is not provided in the overlapping portion with the formation region, but is provided only in the non-overlapping portion, so that the display housing 2 is not increased in thickness. The length in the longitudinal direction can be shortened.

  The wall surface 28 of the output space 27 and the wall surface 29 of the communication passage 21 are formed so as to be inclined toward the openings 22a and 22b. Specifically, the output space 27 and the communication path 21 are formed by inclining the wall surfaces 28 and 29 facing the diaphragm 24 so that the space portion expands in the thickness direction of the display housing 2 as approaching the openings 22a and 22b. Has been.

  Since the horn structure including the output space 27 and the communication path 21 improves the radiation efficiency of the reproduced sound, the stereo reproduced sound can be effectively propagated around the terminal. In particular, since it is possible to suppress a decrease in the sound pressure level on the low sound side in the reproduced sound, it is possible to make the listener listen to a stereo sound with a sense of spread.

  The speaker formation area on the back side of the metal frame 26 is partitioned by a partition wall 26a. The partition wall 26a is a linear rib provided so as to protrude from the substrate surface, and is formed for each speaker so as to surround the periphery of the speaker by 360 °. The speakers 20a and 20b are positioned in the vertical and horizontal directions by the partition wall 26a. A notch 30 is formed in a part of the partition wall 26a for drawing out the wiring from the driving unit 25. The metal frame 26 is attached to the display housing 2 by a locking portion 26b provided at the end.

  A gap A5 is formed on the back side of the metal frame 26 in the display housing 2, and a filler 35 that fills the gap A5 in the thickness direction of the display housing 2 is provided as will be described later.

  FIGS. 7A and 7B are plan views showing an example of the details of the main part of the mobile communication terminal of FIG. 1. FIG. 7A shows the stereo playback sound output speakers 20a and 20b. The state of the back surface is shown, and the state of the side surface is shown in FIG. In the speakers 20 a and 20 b, the diaphragm 24 and the drive unit 25 are accommodated in a resin speaker case 33. The main surface of the vibration plate 24 is a vibration surface 24a, and the drive unit 25 is arranged on the opposite side of the vibration plate 24 from the vibration surface 24a, that is, on the back surface side so that the central axes coincide with each other.

  FIG. 8 is a diagram showing an example of the details of the main part in the mobile communication terminal of FIG. 1 in comparison with the conventional one, and shows a state where the display housing 2 is viewed from the back side. FIG. 9 is a cross-sectional view showing the details of the main part in the mobile communication terminal of FIG. 1, and shows a state in the display housing 2 cut along line A3-A3 of FIG.

  In a conventional mobile communication terminal that outputs stereo reproduction sound from two openings provided on the display panel of the display housing 2, the filler 101 is disposed on the back side of the speakers 20 a and 20 b in the display housing 2. The filler 101 is a sound insulation wall for blocking the reproduction sound generated by one speaker from propagating to the other speaker side when outputting the stereo reproduction sound, and surrounds the driving unit 25 of each speaker 20a and 20b. It is formed.

  On the other hand, in the present embodiment, the reproduced sound emitted from the back surfaces of the speakers 20a and 20b is diffused to the front end side of the display housing 2 without mixing the left and right channels. Specifically, the filler 35 extends vertically to a vertical section 38 that vertically extends the speaker, a speaker wall 39 provided along the periphery of the driving section 25 in the speaker, and the distal end side of the display housing 2. It consists of parts 36 and 37.

  The speaker wall 39 is provided for each of the speakers 20a and 20b, and is formed on a straight line connecting the speakers 20a and 20b. The speaker wall 39 is a sound insulating wall that blocks the reproduction sound generated on the back surfaces of the speakers 20a and 20b from directly propagating from one speaker to the other speaker side. Here, it is assumed that the speaker wall 39 is formed at 180 ° inside the speaker with respect to the arrangement direction of the speakers 20a and 20b.

  The vertical section 38 is formed for each speaker so as to overlap the back surfaces of the speakers 20 a and 20 b, and is vertically cut including the center of the drive section 25. The longitudinal section 38 is provided between the speaker and the display housing 2 to be a cushion material that presses the speaker toward the metal frame 26, and supports the speakers 20a and 20b from the back side. Thereby, it is possible to prevent the speakers 20a and 20b from colliding with the inner surface of the display housing 2 due to an impact caused by dropping of the mobile communication terminal or the like, so that the speakers can be prevented from being damaged. Here, it is assumed that the speaker wall portion 39 and the longitudinal section 38 are connected on the connecting portion 4 side.

  The extending portions 36 and 37 are formed in the central portion of the metal frame 26 by extending to the opposite side of the connecting portion 4 in the display housing 2, and from the recessed portion 37 having a reduced width and the wide end portion 36. Become. The recess 37 is formed on the back side of the liquid crystal panel 31, and one end is connected to the speaker wall 39 and the vertical section 38 and the other end is connected to the tip 36. The recess 37 is a partition that divides the acoustic space A4 formed on the back side of the metal frame 26 in the display housing 2 into right and left, and the reproduced sound propagated from the speakers 20a and 20b is one acoustic space. Propagation from A4 to the other acoustic space A4 is suppressed.

  The acoustic space A4 is a space for diffusing reproduced sound, and communicates with a space A5 formed outside the center of the speakers in the arrangement direction of the speakers 20a and 20b. For this reason, the reproduced sound emitted from the back surfaces of the speakers 20a and 20b propagates to the front end side of the display housing 2 through the gap A5 and reaches the acoustic space A4. Therefore, the reproduced sound is sufficiently diffused in the acoustic space A4, and the diffusion area of the reproduced sound on the back side of each speaker can be expanded. Particularly, since the reproduced sound is diffused with the left and right channels being made independent, the sound pressure of the reproduced sound can be improved.

  The distal end portion 36 is formed closer to the connecting portion 4 than the receiver 34 disposed in the display housing 2. By providing such a front end portion 36, it is possible to suppress the reproduction sound generated on the back surfaces of the speakers 20 a and 20 b from propagating to the receiver 34 side and to prevent the reproduction sound from interfering with the reception sound by the receiver 34. be able to.

  By providing such a filler 35, the diffusion region for diffusing the reproduced sound generated on the back surface of each speaker 20a and 20b can be expanded, so that the stereo reproduced sound can be effectively emitted. In particular, since the wide space formed on the back side of the liquid crystal panel 31 becomes the acoustic space A4 of the reproduced sound, the sound pressure of the reproduced sound is improved, and stereo reproduction with a rich volume feeling of bass can be performed.

  According to the present embodiment, each opening 22a and 22b communicating with the speaker is not blocked by the operation housing 3 even in the normally closed state in which the display surface 5 is on the inside. It is possible to prevent the stereo reproduction sound emitted from 20a and 20b from becoming difficult to hear.

  Also, since the stereo playback sound is emitted from the openings 22a and 22b provided on the opposing end faces through the communication path 21 communicating with the output space 27 of the playback sound, the stereo playback sound is effectively transmitted around the terminal. It can be propagated. In particular, since the size of each speaker 20a and 20b can be increased without increasing the size of the display housing 2, it is possible to improve the quality of stereo reproduction sound output from each speaker.

  In the present embodiment, an example in which stereo playback sound is output by each speaker 20a and 20b has been described, but the present invention is not limited to this. For example, an audio signal processing means for converting the sound image of the stereo reproduction sound by the speakers 20a and 20b into a three-dimensional image may be provided. That is, by providing a signal processing unit that adds signals having different phase characteristics to audio signals consisting of left and right channels, the sound image localization by reproduced sound emitted from each speaker is made three-dimensional. Also good. By making the sound image localization three-dimensional and applying the present invention to a so-called surround effect, it is possible to obtain a stereo reproduction sound with a broader feeling.

Embodiment 2. FIG.
In the first embodiment, openings 22a and 22b are provided on both side surfaces of the display housing 2 to emit the reproduced sound, so that the stereo reproduced sound can be satisfactorily heard even when the display surface 5 is in the terminal state. An example of a portable communication terminal that can be used has been described. On the other hand, in this embodiment, a case will be described in which stereo playback sound is output by switching the left and right channels according to the terminal state.

  FIG. 10 is a perspective view showing an example of the details of the main part of the mobile communication terminal according to the second embodiment of the present invention, an open / close detection sensor (magnet 41 and hall element 42) for detecting the terminal state, The arrangement of the non-rotation detection sensors (magnet 43 and hall element 44) is shown.

  The open / close detection sensor is a magnetic sensor using the Hall effect, and detects the open / closed state of the display housing 2 and the operation housing 3. The open / close detection sensor includes a magnet 41 and a hall element 42. The magnet 41 is a small rectangular parallelepiped magnet, and is embedded in the distal end portion of the display housing 2. The hall element 42 is formed of a small integrated circuit (IC) and is embedded in an end portion of the operation housing 3 opposite to the connecting portion 4. The magnet 41 and the hall element 42 are provided at the center positions in the short direction of the casing, respectively, and are arranged to face each other in the normal close state and the reverse close state.

  In particular, the magnet 41 is disposed on the center line of the rotating shaft 10. Thereby, it is possible to detect the open / closed state of both housings regardless of whether the display housing 2 is in a rotating state or a non-rotating state with respect to the operation housing 3.

  The rotation / non-rotation detection sensor is a magnetic sensor for detecting the rotation / non-rotation state of the display housing 2 and the operation housing 3, and includes a magnet 43 and a hall element 44. The magnet 43 is embedded in the end of the display housing 2 on the hinge 9 side, and the Hall element 44 is embedded in the hinge 9. The magnets 43 and the hall elements 44 are provided so as to be offset with respect to the rotary shaft 10 and are arranged so as to face each other in the normal open state.

  Each Hall element 42 and 44 is turned on and off based on the strength of the magnetic field, and outputs a detection signal. Here, it is assumed that when the magnetic field strength exceeds a predetermined threshold value, it is turned on, and when the magnetic field strength is less than the threshold value, it is turned off.

  FIGS. 11A and 11B are state transition diagrams showing an example of the detection operation in the open / close detection sensor of FIG. 10, and FIG. 11A shows a normally closed state in which the Hall element 42 is turned on. FIG. 11 (b) shows a terminal state in which both housings are slightly opened and the voltage level of the detection signal is switched.

  When the rotation angle θ of the display housing 2 with respect to the operation housing 3 exceeds the critical angle θc with respect to the rotation shaft 11, the voltage level of the detection signal is switched. That is, when the rotation angle θ is equal to or smaller than the critical angle θc, the Hall element 42 is turned on and the terminal is considered to be in the closed state. On the other hand, when the rotation angle θ exceeds the critical angle θc, the Hall element 42 is turned off and the terminal is considered to be in the open state. The critical angle θc is determined by a threshold value in the Hall element 42.

  When the transition is made between the reverse closed state and the reverse open state, the open / closed state is detected in the same manner as the transition between the normal closed state and the normal open state described above. In this way, by using the open / close detection sensor, it is possible to identify whether both the housings are in a closed state or an open state.

  12A and 12B are state transition diagrams showing an example of the detection operation in the rotation / non-rotation detection sensor of FIG. 10, and in FIG. 12A, the Hall element 44 is turned on. A non-rotation state is shown, and FIG. 12B shows a terminal state in which the display housing 2 is slightly rotated with respect to the operation housing 3 and the voltage level of the detection signal is switched.

  When the rotation angle φ of the display housing 2 with respect to the operation housing 3 exceeds the critical angle φc with respect to the rotation shaft 10, the voltage level of the detection signal is switched. That is, when the rotation angle φ is equal to or smaller than the critical angle φc, the Hall element 44 is turned on, and the terminal is considered to be in a non-rotation state. On the other hand, when the rotation angle φ exceeds the critical angle φc, the Hall element 44 is turned off and the terminal is considered to be in the rotation state. The critical angle φc is determined by the threshold value in the Hall element 44.

  Based on the detection results of the open / close detection sensor and the rotation / non-rotation detection sensor, each terminal state, that is, a normal close state, a normal open state, a reverse open state, and a reverse close state is identified. Specifically, the closed state and the non-rotating state are regarded as the normally closed state, and the open state and the non-rotating state are regarded as the normally open state. Moreover, when it is an open state and it is a rotation state, it is regarded as a reverse open state, and when it is a close state and it is a rotation state, it is regarded as a reverse close state.

  In such a portable communication terminal 40, drive control of each speaker 20a and 20b according to the transition path | route of a terminal state is performed.

  FIG. 13 is a block diagram illustrating an example of a functional configuration in the mobile communication terminal of FIG. 10, and illustrates a configuration related to a left / right channel switching operation in stereo reproduction sound. The mobile communication terminal 40 includes a main control unit 50, an antenna 51, a wireless communication unit 52, an operation input unit 53, an open / close detection sensor 54, a rotation / non-rotation detection sensor 55, a voice input unit 56, a voice output unit 57, a terminal state. The identification unit 58, the speaker drive control unit 59, the terminal state storage unit 60, and the screen display control unit 61 are configured.

  The terminal state identification unit 58 identifies which terminal state the mobile communication terminal 40 is in. This terminal state identification process is performed based on detection results from the open / close detection sensor 54 and the rotation / non-rotation detection sensor 55.

  Specifically, the detection signal is digitally processed by a DSP (Digital Signal Processor), and a terminal state identification result is output. The terminal state identification results are stored in time series by the terminal state storage unit 60.

  The speaker drive control unit 59 performs drive control of the speakers 20a and 20b based on the terminal state identification result. This drive control is characterized in that when the terminal is in the reverse open state, the speakers 20a and 20b are driven based on the immediately preceding terminal state to output stereo reproduction sound consisting of left and right channels. That is, switching between the left and right channels in stereo playback sound is performed based on the terminal state identification history stored in time series.

  For example, when transitioning from the normal open state to the reverse open state, the speakers 20a and 20b are driven without switching channels before and after the state transition. That is, when a transition is made from the normal open state to the reverse open state, in the reverse open state, the speakers 20a and 20b are driven with the same channel assignment as the channel assignment in the normal open state. Thereby, when the terminal is in the normally open state, the left and right channels can be prevented from being switched only by slightly rotating the display housing 2 with respect to the operation housing 3.

  Further, when transitioning from the reverse close state to the reverse open state, the speakers 20a and 20b are driven without switching channels before and after the state transition. That is, when the transition from the reverse close state to the reverse open state occurs, in the reverse open state, the speakers 20a and 20b are driven with the same channel assignment as the channel assignment in the reverse close state. Thereby, when the terminal is in the reverse closed state, it is possible to prevent the left and right channels from being switched by slightly opening the display housing 2 and the operation housing 3.

  In each terminal state except the reverse open state, the right channel playback sound is output from the right speaker as viewed from the terminal operator, and the left channel playback sound is output from the left speaker. That is, in the normal closed state and the normal open state, the right channel playback sound is output from the right speaker 20a on the right side when viewed from the operation surface 6 side of the operation casing 3, and the left channel playback sound is output from the left speaker 20b on the left side. A sound is output (hereinafter, this state is referred to as a normal state). In the reverse closed state, the left and right channels are reversed, and the right channel playback sound is output from the left speaker 20b on the right side when viewed from the operation surface 6 side of the operation casing 3, and the left speaker 20a on the left side outputs the left sound. Channel playback sound is output.

  Here, it is assumed that the screen display can be switched in accordance with the terminal state, in the same way as the switching of the left and right channels in stereo playback sound. That is, based on the identification result of the terminal state, control for switching the screen display direction on the main display with respect to the direction of the display surface 5 is performed.

  Specifically, in each terminal state except the reverse open state, screen display is performed so that the top and bottom are upright when viewed from the terminal operator. That is, in the normal closed state and the normal open state, the screen display is performed in the upright state on the display surface 5 so that the image is upright when viewed from the operation surface 6 side of the operation housing 3, and the reverse closed state. Then, the direction of the screen display is reversed, and the screen display is performed in an inverted state with respect to the display surface 5.

  Further, when transitioning from the normal open state to the reverse open state, control for driving the liquid crystal panel without switching the screen display orientation before and after the state transition is performed. Thereby, when the terminal is in the normally open state, it is possible to prevent the screen display orientation from being switched only by slightly rotating the display housing 2 with respect to the operation housing 3.

  Further, when transitioning from the reverse close state to the reverse open state, control is performed to drive the liquid crystal panel without switching the screen display orientation before and after the state transition. Thereby, when the terminal is in the reverse closed state, it is possible to prevent the screen display orientation from being switched by slightly opening the display housing 2 and the operation housing 3.

  The left and right channel switching in the stereo playback sound described above is performed in conjunction with the switching of the screen display direction. As a result, the left and right channels can always match the screen display on the main display regardless of the terminal state.

  FIG. 14 is a diagram showing an example of the history operation in the mobile communication terminal of FIG. 10, and the operation status of the screen display on the main display and the left and right channel assignments in the stereo playback sound by the speakers 20 a and 20 b As shown. In the normal closed state (state [1]), the open / close detection sensor 54 and the rotation / non-rotation detection sensor 55 are both on (ON), the screen display is upright with respect to the display surface 5, and the left and right channel assignments are It becomes a normal state.

  In the normal open state (state [2]), the open / close detection sensor 54 is turned off, and the rotation / non-rotation detection sensor 55 is turned on. In this state, the screen display and channel assignment are the same as in the normal closed state. In the reverse closed state (state [4]), the open / close detection sensor 54 is turned on, the rotation / non-rotation detection sensor 55 is turned off, the screen display is inverted with respect to the display surface 5, and left and right channel assignments are made. Is in a state where the left and right are switched.

  In the reverse open state, the open / close detection sensor 54 and the rotation / non-rotation detection sensor 55 are both turned off. At this time, the screen display and the channel assignment are not switched, and the previous state is maintained.

  In the present embodiment, the screen display control unit 61 performs control to display the channel assignments for the speakers 20a and 20b on the main display according to the switching of the left and right channels. Specifically, when the terminal transitions from the reverse open state to the reverse close state, and when the terminal transitions from the reverse open state to the normal open state, the channel assignment is pictically displayed until a predetermined period elapses from the state transition, that is, , Displayed by pictograms.

  FIGS. 15 and 16 are diagrams showing an example of channel assignment screen display operation in the mobile communication terminal of FIG. 10, and FIG. 15 shows the state of channel assignment displayed on the main display in the normal open state. FIG. 16 shows a channel assignment state displayed in the reverse close state.

  The channel assignment pictograph 71 displayed on the main display is displayed in conjunction with the switching operation of the left and right channels in the stereo playback sound. That is, when the terminal transitions from the reverse open state to the reverse close state and when the terminal transitions from the reverse open state to the normal open state, the left and right channels are switched before and after the state transition. Based on the switching operation, a pictographic display 71 indicating channel assignment for each speaker 20a and 20b is displayed on the screen for a predetermined period, for example, for a few seconds immediately after the state transition.

  Such a pictographic display 71 is displayed at a position on the display screen on the speakers 20a and 20b side in any terminal state. That is, in the normal open state, it is displayed at a position on the near side on the display screen, and in the reverse closed state, it is displayed at a position on the far side on the display screen.

  With such a configuration, the channel assignment for the speakers 20a and 20b is displayed on the screen in accordance with the switching of the left and right channels, so that the terminal operator can correctly recognize the left and right channels. In particular, when the left and right channels are switched due to the transition of the terminal state, it is effective to call attention by displaying the channel assignment for a predetermined period from the state transition.

  Steps S101 to S112 in FIG. 17 are flowcharts illustrating an example of a history operation in the mobile communication terminal in FIG. First, the storage area in the terminal state storage unit 60 is initialized, and the normally open state (state [2]) is stored as the terminal state (step S101).

  Next, the terminal state identification unit 58 detects the terminal state of the terminal based on detection signals from the open / close detection sensor 54 and the rotation / non-rotation detection sensor 55 (step S102). In this state detection, when the open / close detection sensor 54 is in the on state and the rotation / non-rotation detection sensor 55 is in the off state, it is determined to be in the reverse close state, and the left and right channels are switched to switch the speakers 20a and 20b. Is driven (steps S103 and S108). At this time, the reverse closed state (state [4]) is stored in the terminal state storage unit 60 (step S109).

  Further, when the open / close detection sensor 54 is in the off state and the rotation / non-rotation detection sensor 55 is in the on state, it is determined that it is normally open, and the speakers 20a and 20b are driven in the normal state (step) S104, S110). At this time, the normally open state (state [2]) is stored in the terminal state storage unit 60 (step S111).

  When both the open / close detection sensor 54 and the rotation / non-rotation detection sensor 55 are in the on state, it is determined that they are normally closed, and the speakers 20a and 20b are driven in the normal state (steps S105 and S112). .

  Further, when both the open / close detection sensor 54 and the rotation / non-rotation detection sensor 55 are in the off state, it is determined that the reverse open state is established. At this time, if the stored content in the terminal state storage unit 60 is the state [2], it is regarded as a transition from the normal open state, the left and right channels are not switched, and each speaker 20a is maintained while maintaining the normal state. And 20b are driven (steps S106 and S112). If the stored content is not in the state [2], it is regarded as a transition from the reverse close state, and the state in which the left and right channels are switched is held (step S107).

  According to the present embodiment, the left and right channels are appropriately switched according to the transition path of the terminal state and the speakers 20a and 20b are driven, so that it is possible to suppress the left and right channels from being switched due to an erroneous operation. Operability can be improved.

It is the top view which showed the example of 1 structure of the portable communication terminal by Embodiment 1 of this invention. It is the top view which showed an example of the terminal state in the portable communication terminal of FIG. It is the state transition diagram which showed an example of the terminal state in the portable communication terminal of FIG. It is sectional drawing which showed an example of the principal part detail in the portable communication terminal of FIG. 1, and the mode in the display housing | casing 2 cut | disconnected by the A1-A1 line | wire is shown. It is the top view which showed an example of the principal part detail in the portable communication terminal of FIG. It is sectional drawing which cut | disconnected the metal frame of FIG. 5 by the A2-A2 line. It is the top view which showed an example of the principal part detail in the portable communication terminal of FIG. 1, and the mode of the speakers 20a and 20b for stereo reproduction sound output is shown. It is the figure which showed an example of the detail of the principal part in the portable communication terminal of FIG. 1 compared with the conventional one, and the mode that the display housing | casing 2 was seen from the back side is shown. It is sectional drawing which showed the principal part detail in the portable communication terminal of FIG. 1, and the mode in the display housing | casing 2 cut | disconnected by the A3-A3 line | wire of FIG. 8 is shown. It is the perspective view which showed an example of the principal part detail in the portable communication terminal by Embodiment 2 of this invention. FIG. 11 is a state transition diagram illustrating an example of a detection operation in the open / close detection sensor of FIG. 10. FIG. 11 is a state transition diagram illustrating an example of a detection operation in the rotation / non-rotation detection sensor of FIG. 10. It is the block diagram which showed an example of the function structure in the portable communication terminal of FIG. 10, and the structure which concerns on the channel switching operation | movement on the right and left in a stereo reproduction | regeneration sound is shown. It is the figure which showed an example of the log | history operation | movement in the portable communication terminal of FIG. It is the figure which showed the operation example of the screen display of the channel allocation in the portable communication terminal of FIG. It is the figure which showed the operation example of the screen display of the channel allocation in the portable communication terminal of FIG. It is the flowchart which showed an example of the log | history operation | movement in the portable communication terminal of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile communication terminal 2 Display housing | casing 3 Operation housing | casing 4 Connection part 5 Display surface 6 Operation surface 7a, 7b Earpiece sound hole 8 Microphone 9 Two-axis hinge 20a Right speaker 20b Left speaker 21 Communication path 22a, 22b Opening 24 Diaphragm 24a Vibrating surface 25 Drive unit 26 Metal frame 27 Output space 28, 29 Wall surface 31 Liquid crystal panel 33 Speaker housing 34 Receiver 35 Filler 36 Tip portion 37 Recess 38 Vertical section 39 Speaker wall 40 Mobile communication terminals 41, 43 Magnets 42, 44 Hall element 58 Terminal state identification unit 59 Speaker drive control unit 60 Terminal state storage unit 61 Screen display control unit 71 Pictograph display A4 Acoustic space A5 Air gap

Claims (9)

A portable display unit comprising a thin display case provided with a display surface on one main surface, an operation case having an operation surface made up of a large number of operation keys, and a connecting part for connecting the display case and the operation case in a foldable manner. In the communication terminal,
Two speakers provided in the display housing and arranged along the display surface with the vibration surface facing the display surface side;
Two openings for reproducing sound output, which are provided on two opposing end faces of the display housing and communicate with the speakers, respectively .
Two communication paths that are provided in the display housing and communicate with the openings, respectively, in an output space of a reproduction sound formed for each speaker on the front side of the vibration surface of each speaker;
The display case has a liquid crystal panel on the display surface,
Each of the speakers is disposed so that a part of the speaker overlaps with the formation region of the liquid crystal panel, and the output space is formed in a non-overlap portion with the formation region of the liquid crystal panel .   The mobile communication terminal according to claim 1, wherein each of the speakers is provided closer to the connecting portion than the display surface of the display housing.   2. The mobile communication terminal according to claim 1, wherein each of the output spaces and the communication path is formed with its wall surface inclined toward the opening side. A liquid crystal panel as the display surface is disposed on the front surface, and a metal frame in which the speakers are disposed on the connection portion side of the liquid crystal panel on the rear surface.
A sound insulation wall disposed on the back side of the metal frame in the display housing;
An acoustic space formed on the back side of the liquid crystal panel on the back side of the metal frame in the display housing and communicating with the back side of each speaker;
The sound insulation wall is a speaker wall formed on a straight line connecting both speakers,
The mobile communication terminal according to claim 1, wherein one end is connected to the speaker wall and the other end is extended to the back side of the liquid crystal panel. Normal closed state in which the display surface and operation surface are folded facing each other, normal open state in which both housings are expanded with the display surface and operation surface facing in the same direction, and reverse close in which the display surface is folded outward. A portable communication terminal that is capable of transitioning a state and that passes a reverse open state in which both housings are expanded with the display surface and the operation surface facing in opposite directions in a transition process between a normal open state and a reverse close state,
Terminal state identification means for identifying which state the terminal is in;
Terminal state storage means for storing a terminal state identification result;
The speaker drive control means for driving each speaker based on the immediately preceding terminal state and outputting stereo reproduction sound consisting of left and right channels when the terminal is in the reverse open state. The mobile communication terminal according to 1. The speaker drive control means drives each speaker without switching the channel before and after the state transition when transitioning from the normal open state to the reverse open state and when transitioning from the reverse close state to the reverse open state. The mobile communication terminal according to claim 5 . Channel assignment display means is provided for displaying the channel assignment for each speaker on the display surface of the display housing in accordance with the switching of the left and right channels in the stereo playback sound output from each speaker. The mobile communication terminal according to claim 5 . The channel assignment display means displays the channel assignment on the screen until a predetermined period elapses from the state transition when the terminal transitions from the reverse open state to the reverse close state and when the terminal transitions from the reverse open state to the normal open state. The mobile communication terminal according to claim 7 , wherein:   2. The signal processing unit according to claim 1, further comprising: a signal processing unit that adds a signal having different phase characteristics to an audio signal composed of left and right channels, and three-dimensionalizes a sound image in stereo reproduction sound from each speaker. Mobile communication terminal.

Images