JP2012100049A - Electronic apparatus and electro-acoustic transducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus which reduces the degradation of a sound pressure level of an electro-acoustic transducer even with a structure where a sound hole is formed on a side surface of a body housing.SOLUTION: In a portable telephone 100, an acoustic reflection part 120 is disposed in a body housing 110 in which a sound hole 112 is formed on a side surface 111 and an oscillation device 210 is disposed therein, and the acoustic reflection part 120 inclines relative to both a piezoelectric element 211 and the sound hole 112 and faces the both. Thus, sound waves output by the oscillation device 210 are reflected by the acoustic reflection part 120 and output from the sound hole 112, and the degradation of a sound pressure level is reduced.

Description

  The present invention relates to an electronic device that outputs sound waves of an electroacoustic transducer from a sound hole, and more particularly, to an electronic device having a sound hole formed on a side surface, and the electroacoustic transducer.

  In mobile phones, development of thin and stylish mobile phones that have commercial value as an audio function such as video playback has been active. In moving image reproduction, a high sound pressure level is required in front of the liquid crystal screen in order to view sound simultaneously with the moving image on the liquid crystal screen. Under these conditions, it is preferable to place electroacoustic transducers that are oscillation devices on the left, right, top and bottom of the liquid crystal screen. There are large restrictions.

  For this reason, in order to realize the arrangement close to the liquid crystal screen, as shown in FIG. 3, a side sound hole type mobile phone in which a sound hole is provided on the side surface of the housing has been developed. As shown in FIG. 4, this side-type mobile phone has a structure in which a speaker is provided with sound holes on the lateral side with respect to the radiation surface, and the sound waves are refracted by a cover plate provided immediately above the radiation surface. And radiated from the sound holes on the side.

  Currently, there are various proposals for the mobile phone as described above (Patent Document 1).

International Publication No. 2008/015901 Pamphlet

  In the above-described side sound hole type electroacoustic transducer, since the sound hole is close to the liquid crystal screen, it is advantageous in terms of sound pressure level, but in terms of the electroacoustic transducer, sound waves are refracted and emitted. Therefore, there is a problem that sound energy loss is large and sound pressure level is attenuated. There is a demand for mounting technology of an electroacoustic transducer that achieves a large volume in the side sound hole.

  The present invention has been made in view of the above-described problems, and an electronic apparatus that can reduce the attenuation of the sound pressure level of an electroacoustic transducer even with a structure in which a sound hole is formed on a side surface of a main body housing. The electroacoustic transducer is provided.

  An electronic device according to the present invention includes a main body housing having a sound hole formed on a side surface thereof, a piezoelectric element positioned on the side of the sound hole in the main body housing and having a principal surface intersecting the side surface, An elastic member that constrains one main surface, a vibration member that supports the elastic member and is connected to the main body housing, and is inclined to both the piezoelectric element and the sound hole inside the main body housing. And an acoustic reflector that reflects the ultrasonic wave oscillated from the piezoelectric element to the sound hole.

  The electroacoustic transducer of the present invention is an electroacoustic transducer for use in the electronic device of the present invention, and is located in the side of the sound hole inside the main body housing of the electronic device in which the sound hole is formed on the side surface. A piezoelectric element in which the direction of the main surface intersects the side surface, an elastic member that constrains one main surface of the piezoelectric element, a vibration member that supports the elastic member and is connected to the main body housing, and the main body And an acoustic reflection portion that inclines and faces both the piezoelectric element and the sound hole inside the housing and reflects ultrasonic waves oscillated from the piezoelectric element to the sound hole.

  The various components of the present invention do not necessarily have to be independent of each other. A plurality of components are formed as a single member, and a single component is formed of a plurality of members. It may be that a certain component is a part of another component, a part of a certain component overlaps with a part of another component, or the like.

  In addition, the aspect and the side in the present invention only represent the relative relationship of a plurality of components, and do not necessarily mean the left-right direction. Therefore, the sound hole formed on the side surface is allowed to be formed on the upper surface in an actual device.

  In the electronic device of the present invention, the acoustic reflection portion located inside the main body housing, in which the sound hole is formed on the side surface and the piezoelectric element is disposed, is inclined and faces both the piezoelectric element and the sound hole. is doing. For this reason, since the sound wave output from the piezoelectric element is reflected by the acoustic reflecting portion and output from the sound hole, attenuation of the sound pressure level can be reduced.

It is a typical vertical bottom view which shows the structure of the principal part of the mobile telephone which is an electronic device of embodiment of this invention. It is the typical vertical section bottom view which compared the conventional structure and the structure of this Embodiment. It is a perspective view which shows the external appearance of the mobile telephone which is the conventional electronic device. It is a typical vertical bottom view which shows the structure of the principal part of a mobile telephone. It is a typical vertical bottom view which shows the structure of the principal part of the mobile phone of one modification.

  An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, a mobile phone 100 that is an electronic device according to the present invention is located on the side of the sound hole 112 inside the main body housing 110 having a sound hole 112 formed in the side surface 111 and the main body housing 110. The piezoelectric element 211 whose main surface direction intersects the side surface 111, the elastic member 212 that constrains one main surface of the piezoelectric element 211, and supports the elastic member 212 and is connected to the main body housing 110. A vibration member 213 and an acoustic reflector 120 that is opposed to both the piezoelectric element 211 and the sound hole 112 inside the main body housing 110 and reflects the ultrasonic wave oscillated from the piezoelectric element 211 to the sound hole 112. Have.

  Note that the mobile phone 100 according to the present embodiment is also provided with a display panel (not shown) such as an LCD (Liquid Crystal Display) or an organic EL (Electro-Luminescence) on the front surface orthogonal to the side surface 111 as in the prior art. ing. In addition, a pair of left and right oscillation elements 210 are individually disposed on the left and right side surfaces 111. And the main body housing 110 and the acoustic reflection part 120 are integrally molded.

  More specifically, the sound hole 112 is disposed at a position perpendicular to the acoustic radiation surface, that is, the side surface 111, and the sound wave is refracted by the upper lid and has a sound hole on the side surface 111, as in the conventional configuration. 112 is emitted into the atmosphere. As shown in FIG. 2 (b), this configuration is characterized in that an inclined acoustic reflector 120 is installed between the upper lid and the acoustic radiation surface. That is, the sound loss is reflected by the inclined acoustic reflector 120, so that the pressure loss can be reduced. When the pressure loss in the fluid is taken into consideration, the loss amount is maximized under the condition that the sound wave is reflected at 90 degrees as shown in FIG. That is, in this configuration, by reducing the angle at which the sound wave is refracted, the pressure loss can be reduced and the attenuation of the sound pressure level can be reduced.

  In the mobile phone 100 of the present invention, the piezoelectric element 211 and the sound hole 112 are provided inside the box-shaped main body housing 110 in which the sound hole 112 is formed in the side surface 111 and the oscillation element 210 is disposed inside as described above. And the acoustic reflection part 120 which inclines and opposes both. For this reason, since the sound wave output from the oscillation element 210 is reflected by the acoustic reflection unit 120 and output from the sound hole 112, attenuation of the sound pressure level can be reduced.

  Moreover, in the mobile phone 100 of the present embodiment, the display panel is arranged on the front surface orthogonal to the side surface 111 as in the conventional case. For this reason, the oscillation element 210 can be disposed in the space on the back surface of the display panel. Furthermore, since the sound hole 112 can be positioned in the vicinity of the display panel, a good sound wave can be heard while viewing the image.

  Furthermore, in mobile phone 100 of the present embodiment, a pair of left and right oscillation elements 210 are individually arranged on side surfaces 111 on both the left and right sides. For this reason, stereo sound waves can be realized by the pair of left and right oscillation elements 210.

  Moreover, in the mobile phone 100 of the present embodiment, the main body housing 110 and the acoustic reflection unit 120 are integrally formed. For this reason, it is not necessary to install the separate acoustic reflection part 120 in the main body housing 110, the structure is simple, and productivity is favorable.

  The present invention is not limited to the present embodiment, and various modifications are allowed without departing from the scope of the present invention. For example, in the said form, it illustrated that the main body housing 110 and the acoustic reflection part 120 were shape | molded integrally. However, the acoustic reflection unit 120 and the oscillation element 210 may be integrally formed as an electroacoustic transducer disposed inside the main body housing 110.

  In this case, the oscillation element 210 and the acoustic reflection unit 120 can be simultaneously mounted on the mobile phone 100 simply by incorporating the unitized electroacoustic transducer into the main body housing 110. In addition, since the angle of the acoustic reflection unit 120 with respect to the oscillation element 210 can be fixed in advance, the angle can be optimally adjusted to satisfactorily reduce the attenuation of the sound pressure level.

  The electroacoustic transducer 200 as described above is disposed inside the main body housing 110 at a position where the piezoelectric element 211 having a main surface substantially perpendicular to the side surface 111 is supported by the elastic member 212 and communicates with the sound hole 112. The oscillation element 210 and the acoustic reflection part 120 which is located inside the main body housing 110 and is inclined and opposed to both the piezoelectric element 211 and the sound hole 112, and the acoustic reflection part 120 and the oscillation element 210 are provided. It consists of an integrally formed structure.

  Further, in the above embodiment, the monomorph electroacoustic transducer 200 in which one oscillation element 210 is mounted on one surface of the elastic member 212 is illustrated. However, as shown in FIG. 5, a bimorph electroacoustic transducer 200 in which two oscillation elements 210 constrain the principal surfaces on both sides of the elastic member 212 can also be implemented.

  Furthermore, in the above embodiment, the electronic device 100 that outputs the ultrasonic wave output from the electroacoustic transducer 200 from one sound hole 112 that communicates with one surface is exemplified. However, as shown in FIG. 5, it is also possible to implement an electronic device 100 that outputs ultrasonic waves output from both surfaces of the electroacoustic transducer 200 from two sound holes 112 that are individually connected to both surfaces.

  Moreover, in the said form, it assumed that the electronic device consisted of the mobile telephone 100 of a folding structure similarly to the past. However, the mobile terminal device may be composed of a mobile phone with a slide structure, a mobile phone with a solid structure, a folding structure, a slide structure, a PDA (Personal Digital Assistance) with a solid structure, or an electronic dictionary. (Not shown).

DESCRIPTION OF SYMBOLS 100 Mobile phone 110 Main body housing 111 Side surface 112 Sound hole 120 Acoustic reflection part 200 Electroacoustic transducer 210 Oscillation element 211 Piezoelectric element 212 Elastic member 213 Vibration member

Claims (7)

A body housing having sound holes formed on the side surfaces;
A piezoelectric element located on the side of the sound hole inside the body housing and having a principal surface intersecting the side surface;
An elastic member constraining one main surface of the piezoelectric element;
A vibration member supporting the elastic member and connected to the main body housing;
An acoustic reflector that reflects the ultrasonic wave oscillated from the piezoelectric element and is opposed to both the piezoelectric element and the sound hole inside the main body housing.
Electronic equipment having   The electronic device according to claim 1, wherein a display panel is disposed on a front surface orthogonal to the side surface. An oscillation element is formed by at least the piezoelectric element, the elastic member, and the vibration member,
The electronic device according to claim 1, wherein a pair of left and right oscillation elements are individually arranged on the side surfaces on both the left and right sides.   The electronic device according to claim 1, wherein the electronic device is formed as a mobile phone.   The electronic device according to any one of claims 1 to 4, wherein the main body housing and the acoustic reflection portion are integrally formed. An oscillation element is formed by at least the piezoelectric element, the elastic member, and the vibration member,
5. The electronic device according to claim 1, wherein the acoustic reflection portion and the oscillation element are integrally formed as an electroacoustic transducer disposed inside the main body housing. 6. An electroacoustic transducer used in the electronic device according to claim 6,
A piezoelectric element that is located on the side of the sound hole inside the main body housing of the electronic device in which a sound hole is formed on a side surface, and a direction of a main surface intersects the side surface;
An elastic member constraining one main surface of the piezoelectric element;
A vibration member supporting the elastic member and connected to the main body housing;
An electroacoustic transducer having an acoustic reflecting portion that is inclined and opposed to both the piezoelectric element and the sound hole inside the main body housing and reflects ultrasonic waves oscillated from the piezoelectric element to the sound hole; vessel.

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