JP4290046B2 - Planar speaker unit and electric device including the unit - Google Patents

Description

  The present invention relates to a planar speaker unit and an electric device such as a mobile phone including the planar speaker unit.

The following is well known as an electric device such as a cellular phone provided with a flat speaker. 7 is a perspective view of the electric device, FIG. 8 is a cross-sectional view of the electric device of FIG. 7 cut along a plane including the line BB, and FIG. 9 is an enlarged view of a portion C in FIG. (See Patent Document 1).
A transparent diaphragm (2) is installed in the cabinet (8) of the electrical equipment via a cushion (19), and a display device (3), which is a liquid crystal panel, is provided below the diaphragm (2). Has been. A window hole (18) is opened in the cabinet (8) so as to face the diaphragm (2) and the display device (3). Thereby, the image of the display device (3) can be visually recognized through the diaphragm (2).
A conventional flat speaker is composed of the diaphragm (2) and a vibration supply section (4), and a vibration supply section that vibrates the diaphragm (2) corresponding to one end of the diaphragm (2). (4) is provided. The vibration supply unit (4) includes a magnet member (41) and a coil (40) provided on the diaphragm (2). The magnet member (41) includes a case (44), a yoke (43), and a magnet (42) covered with the yoke (43).
When an AC signal based on the audio signal is passed through the coil (40), lines of magnetic force are generated from the coil (40). The magnetic lines of force act on the magnetic field of the magnets (42), (42) and (42), and the diaphragm (2) vibrates up and down. Thereby, a sound is output from the diaphragm (2).
Utility model registration No. 3078022

In the conventional electric device, the sound of the speaker is output only to one side of the cabinet (8). In such an electric device, if there is an obstacle on the side where the sound is output, there is a problem that the sound is blocked by the obstacle and the sound becomes small.
Further, in a foldable electric device represented by a recent mobile phone (see FIG. 1), an auxiliary cabinet (80) is connected to a cabinet (8) by a hinge (81). A small auxiliary display device (30) called a sub-display is provided on the back side of the main display device (3) so that certain information such as time can be seen with the auxiliary cabinet (80) and cabinet (8) folded. It has been. In the conventional configuration, when the auxiliary cabinet (80) and the cabinet (8) are folded, the sound from the cabinet (8) is blocked by the auxiliary cabinet (80), the sound is reduced, and it is difficult for the user to hear. was there.
An object of the present invention is to provide a flat speaker unit and an electric device that allow a user to hear sound clearly even if there is an obstacle in the direction in which the sound is output.

The flat speaker unit (7) includes a diaphragm (2) that outputs sound, a vibration supply unit (4) that vibrates the diaphragm (2), and a diaphragm (2) in the frame (1). The display device (3) which overlaps is provided, and the diaphragm (2) and the display device (3) are covered with transparent first and second protection panels (5) and (50), respectively. 5) (50) is located on the opposite side of the diaphragm (2) and the display device (3), and both protective panels (5) and (50) have sound waves emitted from the diaphragm (2). Sound emission holes (51) and (51) that allow passage are established.
As for the electrical equipment, the flat speaker unit (7) is attached to the cabinet (8), the auxiliary cabinet (80) is connected to the hinge (81) to the cabinet (8), and the auxiliary cabinet (80) and the cabinet (8) are folded. In this state, the sound emitting hole (51) on the display device (3) side is closed by the auxiliary cabinet (80).

  By providing sound emission holes (51) in the cabinet (8) part around both protection panels (5) and (50) or both protection panels (5) and (50), one sound emission hole (51) is obstructed. Even if it is blocked by an object, sound flows from the other sound emitting hole (51). Thereby, the user can hear a voice clearly.

(overall structure)
Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a state in which the mobile phone according to the present embodiment is opened, and FIG. 2 is a perspective view of the state in which the mobile phone is folded. A flat speaker unit (7) having a display device (3) which is a liquid crystal panel is mounted in a cabinet (8). An auxiliary cabinet (80) having a plurality of operation buttons (82) and (82) is connected to the cabinet (8) by a hinge (81). As shown in FIG. 2, an auxiliary display device (30), which is a small liquid crystal panel, is provided on the back side of the display device (3) on the cabinet (8). And certain information is displayed. Even when the auxiliary cabinet (80) and the cabinet (8) are folded and the display device (3) is closed by the auxiliary cabinet (80), the user can see the information displayed on the auxiliary display device (30). Can do.

(Configuration of flat speaker unit)
3 is a cross-sectional view of FIG. 2 taken along the plane including the line AA. In the cabinet (8), a space is provided in which the flat speaker unit (7) is arranged. Transparent first and second protective panels (5) and (50) are provided on the upper and lower surfaces of the cabinet (8), respectively.
The display device (3) is provided in the frame (1) of the flat speaker unit (7) so as to face the first protective panel (5), and an auxiliary display device is provided on the opposite side of the display device (3). (30) is provided.

A transparent diaphragm (2) is provided between the display device (3) and the first protective panel (5), and coils (40), (40) are provided at both ends of the diaphragm (2). Is deployed. That is, the two protection panels (5) and (50) are located on opposite sides of the diaphragm (2) and the display device (3).
A magnet member (41) is attached to the frame (1). The magnet member (41) includes a yoke and a magnet covered by the yoke. When an AC signal based on the audio signal is passed through the coil (40), lines of magnetic force are generated from the coil (40). The magnetic lines of force act on the magnetic field of the magnet member (41), and the diaphragm (2) vibrates up and down.
Sound emitting holes (51) and (51) that allow the passage of sound waves generated from the diaphragm (2) are opened around the first and second protective panels (5) and (50) of the cabinet (8). ing. Thereby, a sound flows from either the front surface or the back surface of the cabinet (8).

  As described above, when the auxiliary cabinet (80) and the cabinet (8) are folded, the display device (3) is blocked by the auxiliary cabinet (80). The sound emitted from the sound hole (51) is also reduced. However, since the sound of the diaphragm (2) also flows from the sound emission hole (51) opened in the first protective panel (5), the user can hear the sound clearly. Of course, when the auxiliary cabinet (80) and the cabinet (8) are opened, sound flows from the sound emission holes (51) and (51) on the two protection panels (5) and (50).

As shown in FIG. 4, the first and second protective panels (5) and (50) are directly attached to the frame (1) of the flat speaker unit (7), and are provided in the cabinet (8) of the electric equipment. The flat speaker unit (7) may be embedded in the large hole (83). In this case, sound emitting holes (51) and (51) may be provided in the peripheral portions of both protective panels (5) and (50) of the frame (1).
In the above example, the diaphragm (2) faces the display device (3), but may also face the auxiliary display device (30) as shown in FIG.
Further, as shown in FIG. 6, the first and second protection panels (5) and (50) are directly mounted on the cabinet (8) without providing the flat speaker unit (7), and the cabinet (8) is installed. A display device (3), an auxiliary display device (30), and a diaphragm (2) may be provided.
Furthermore, when the auxiliary cabinet (80) and the cabinet (8) are folded, the sound emission hole (51) opened in the second protective panel (50) is blocked by the auxiliary cabinet (80). Instead, a shutter (not shown) may be provided on the sound emission hole (51), and the shutter may be electrically driven in accordance with the opening / closing of the auxiliary cabinet (80).

In the above description, the diaphragm (2) is transparent. However, the diaphragm (2) is provided between the display device (3) and the auxiliary display device (30) (not shown), and the cabinet ( When it is not visible from the outside of 8), it does not have to be transparent.
Further, the opening of the sound emitting hole (51) may be covered with a mesh sheet (not shown) to have a dustproof or water repellent effect.

In the above example, the coil (40) is provided on the diaphragm (2) and the magnet member (41) is provided in the frame (1). However, the magnet member (41) is provided on the diaphragm (2) and the frame (1). A coil (40) may be provided inside.
Furthermore, although the liquid crystal panel is illustrated as the display device (3), an organic EL (electroluminescence display) display or an inorganic EL display may be used instead. Here, the EL display has a well-known configuration in which a light emitter is deposited on a glass substrate. The organic EL display uses an organic material such as diamine as the light emitter, and the inorganic EL display uses an inorganic material such as zinc sulfide as the light emitter.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims.
In the above example, the use of the flat speaker unit for a mobile phone is exemplified, but it may be used for a PDA or digital video.

It is a perspective view of the state which opened the mobile phone. It is a perspective view of the state which folded the mobile phone. It is sectional drawing which fractured | ruptured FIG. 2 in the surface containing an AA line. It is sectional drawing of the cabinet of another mobile telephone. It is sectional drawing of the cabinet of another mobile telephone. It is sectional drawing of the cabinet of another mobile telephone. It is a perspective view of the electric equipment provided with the conventional planar type speaker. It is sectional drawing which fractured | ruptured the planar speaker unit of FIG. 7 in the surface containing a BB line. It is an enlarged view of the C section of FIG.

Explanation of symbols

(1) Frame
(2) Diaphragm
(3) Display device
(4) Vibration supply unit
(5) First protective panel
(8) Cabinet
(50) Second protection panel

Claims (7)

In the frame (1), a diaphragm (2) that outputs sound, a vibration supply unit (4) that vibrates the diaphragm (2), and a display device (3) that overlaps the diaphragm (2) and displays information. In an electric device in which a flat speaker unit (7) having a) is disposed between a transparent first protective panel (5) and a second protective panel (50) attached to a cabinet (8),
Both protective panels (5) and (50) are located on opposite sides of the diaphragm (2) and the display device (3).
Sound vents (51) that allow passage of sound waves emitted from the diaphragm (2) are provided in the periphery of both protection panels (5) and (50) or both protection panels (5) and (50) of the cabinet (8). Electrical equipment characterized by the establishment of (51). The electrical apparatus according to claim 1, wherein an auxiliary display device (30) is provided between the display device (3) and the second protective panel (50). An auxiliary cabinet (80) is connected to the cabinet (8) by a hinge (81), and the sound emitting hole (51) on the display device (3) side is formed in a state where the auxiliary cabinet (80) and the cabinet (8) are folded. The electric device according to claim 1 or 2, wherein the auxiliary cabinet (80) is closed. In the cabinet (8), a diaphragm (2) that outputs sound, a vibration supply unit (4) that vibrates the diaphragm (2), and a display device (3) that overlaps the diaphragm (2) and displays information. ), And the display device (3) and the diaphragm (2) are covered with a transparent first protective panel (5) and a second protective panel (50), respectively.
Both protective panels (5) and (50) are located on opposite sides of the diaphragm (2) and the display device (3), and both protective panels (5) and (50) or both of the cabinet (8) An electric device characterized in that sound emitting holes (51) and (51) are formed in the periphery of the protective panels (5) and (50) to allow passage of sound waves emitted from the diaphragm (2). In the frame (1), a diaphragm (2) that outputs sound, a vibration supply unit (4) that vibrates the diaphragm (2), and a display device (3) that overlaps the diaphragm (2) and displays information. The display device (3) and the diaphragm (2) are covered with a transparent first protective panel (5) and a second protective panel (50),
Both protective panels (5) and (50) are located on opposite sides of the diaphragm (2) and the display device (3).
Sound vents (51) that allow passage of sound waves emitted from the diaphragm (2) are provided in the periphery of both protection panels (5) and (50) or both protection panels (5) and (50) of the frame (1). (51) has been established, a flat speaker unit. The flat speaker unit according to claim 5, wherein an auxiliary display device (30) is provided between the display device (3) and the second protective panel (50). A flat speaker unit (7) according to claim 5 or 6 is attached to a cabinet (8), and an auxiliary cabinet (80) is connected to the cabinet (8) by a hinge (81), and the auxiliary cabinet (80) and the cabinet ( 8) An electric device in which the sound emitting hole (51) on the display device (3) side is closed by the auxiliary cabinet (80) in the folded state.

Images