JP2014072555A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device capable of selectively using a state where vibration sounds are generated and a state where the vibration sounds are not generated.SOLUTION: An electronic device includes: a piezoelectric element 30 which deforms when a voltage is applied thereto; and a first vibration part 11 which may be brought in a first state where vibration sounds transmitted through a part of a human body are generated by deformation of the piezoelectric element 30 and a second state where the vibration sounds are not generated even when the piezoelectric element 30 deforms.

Description

  The present invention relates to an electronic device that vibrates a vibration part by applying an electric signal such as an audio signal to a piezoelectric element, and transmits vibration sound to a user by transmitting the vibration of the vibration part to a human body.

  Patent Document 1 describes an electronic device such as a mobile phone that transmits air conduction sound and bone conduction sound to a user. According to Patent Document 1, air conduction sound is sound transmitted to the auditory nerve of a user by vibration of air that is caused by vibration of an object being transmitted to the eardrum through the external auditory canal. Have been described. Patent Document 1 describes that bone conduction sound is sound transmitted to the user's auditory nerve through a part of the user's body (for example, cartilage of the outer ear) that contacts the vibrating object. ing.

  In the telephone set described in Patent Document 1, it is described that a short plate-like vibrating body made of a piezoelectric bimorph and a flexible material is attached to the outer surface of a housing via an elastic member. Further, in Patent Document 1, when a voltage is applied to the piezoelectric bimorph of the vibrating body, the vibrating body vibrates due to the expansion and contraction of the piezoelectric material in the longitudinal direction, and the user contacts the vibrating body with the auricle. It is described that air conduction sound and bone conduction sound are transmitted to the user.

JP 2005-348193 A

  In the electronic device described in Patent Document 1, no consideration is given to the proper use of a state in which vibration sound is generated and a state in which vibration sound is not generated.

  The objective of this invention is providing the electronic device which can use properly the state which generates a vibration sound, and the state which does not generate a vibration sound.

An electronic device according to the present invention that achieves the above-described object,
A piezoelectric element that deforms when a voltage is applied;
A first vibration unit capable of taking a first state in which vibration sound transmitted through a part of a human body is generated by deformation of the piezoelectric element and a second state in which vibration sound is not generated even when the piezoelectric element is deformed; ,
Is provided.

  The first vibration unit may be at least a part of a casing of the electronic device.

A second vibrating portion on which the piezoelectric element is mounted;
In the first state, the vibration sound may be generated from the casing by transmitting the deformation of the piezoelectric element from the second vibrating section to the casing.

  Air conduction sound may be generated by deformation of the piezoelectric element.

  In the first state, the air conduction sound may be generated from the casing and the second vibrating portion.

  In the second state, the air conduction sound may be generated from the second vibrating section, and the air conduction sound may not be generated from the housing.

The housing has an opening formed in a main surface,
The second vibrating portion may be exposed from the opening and fixed to the main surface in the first state and may not be fixed to the main surface in the second state.

  You may further have a vibration reduction member which is arrange | positioned between the said housing and the said 2nd vibration part, and reduces that the vibration from the said 2nd vibration part is transmitted to the said housing in the said 2nd state.

  In the second state, the second air guide is generated in which the first air conduction sound generated from the main surface side of the second vibration unit is propagated from the second vibration unit to the main surface side through the opening. It may be attenuated by sound.

  The opening may have a parabolic shape in cross section.

  ADVANTAGE OF THE INVENTION According to this invention, the electronic device which can use properly the state which generates a vibration sound, and the state which does not generate a vibration sound can be provided.

It is an external appearance perspective view which shows schematic structure of the electronic device which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the structure of the principal part of the 2nd vibration part of FIG. It is a disassembled perspective view which shows the structure of the principal part of the 2nd vibration part of FIG. 1 in a partial cross section. It is a figure for demonstrating operation | movement of the electronic device of FIG. It is a figure for demonstrating operation | movement of the electronic device of FIG. It is a figure for demonstrating operation | movement of the electronic device of FIG. It is a figure for demonstrating operation | movement of the electronic device of FIG. It is a figure for demonstrating the 1st state and 2nd state of the electronic device of FIG. It is sectional drawing which shows schematic structure of the principal part of the electronic device which concerns on 2nd Embodiment of this invention. It is an external appearance perspective view which shows the modification of the electronic device which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is an external perspective view showing a schematic configuration of the electronic apparatus according to the first embodiment of the present invention. The electronic device according to the present embodiment is a mobile phone such as a smartphone, and includes a housing 11. The housing 11 is made of a resin or metal case. Moreover, the housing | casing 11 may include panels, such as a protection panel of a display part, and a touch panel, in part. In the present embodiment, the housing 11 constitutes the first vibration unit. In addition, in FIG. 1, although the rectangular housing | casing 11 is illustrated by planar view, the shape of the housing | casing 11 is arbitrary.

  An opening 12 a is formed in the main surface 12 of the housing 11. The second vibration part 20 is disposed in the opening 12a so as to be exposed from the opening 12a. The second vibrating unit 20 includes a stacked piezoelectric element 30 that is deformed when a voltage is applied. As described later, the first position exposed from the main surface 12 and the main surface 12 rather than the first position. So that the second position exposed from the second position can be selectively held. Note that, in the first position, the surface of the second vibrating unit 20 may be the same as the main surface 12, or may be recessed or protrude from the main surface 12.

  Next, the structure of the 2nd vibration part 20 is demonstrated.

  2 and 3 show a configuration of a main part of the second vibration unit 20, FIG. 2 is a cross-sectional view, and FIG. 3 is an exploded perspective view showing a partial cross-section. The second vibration unit 20 includes an operation unit 21, a vibration transmission member 22, a piezoelectric element attachment unit 23, a vibration reduction member 24, a rotation member 25, a compression coil spring 26, and a support unit 27.

  The operation part 21 is made of a cylindrical body with a bottom, and has a large diameter part 21a having a bottom part and a small diameter part 21b formed on the opposite side of the bottom part of the large diameter part 21a. A female screw portion 21c is formed on the inner peripheral surface of the small diameter portion 21b. The operation unit 21 is disposed in the opening 12 a so that the large diameter portion 21 a is exposed to the outside of the housing 11. Note that the small diameter portion 21b of the operation portion 21 passes through the opening portion 12a, and engages with the end surface of the large diameter portion 21a via the vibration transmission member 22 at the first position of the second vibration portion 20. 12b is formed over the inner periphery.

  The vibration transmission member 22 is made of, for example, a sponge capable of transmitting vibration, and is interposed between the large diameter portion 21a of the operation portion 21 and the locking portion 12b of the opening portion 12a. The vibration transmitting member 22 may be bonded to the end surface of the large diameter portion 21a or may be bonded to the locking portion 12b.

  The piezoelectric element mounting portion 23 is made of a cylindrical body with a bottom, and has a small diameter portion 23a having a bottom portion and a large diameter portion 23b formed on the open end side of the small diameter portion 23a. The small diameter portion 23a is formed with a male screw portion 23c on the outer peripheral portion, and the piezoelectric element 30 is attached to the inner surface of the bottom portion with a double-sided tape, an adhesive, or the like. The large-diameter portion 23b has guide protrusions 23d formed at a plurality of locations on the outer peripheral portion, for example, at four locations around the periphery.

  The piezoelectric element attaching portion 23 has the small diameter portion 23a to which the piezoelectric element 30 is attached as the main surface 12 side, and the male screw portion 23c is screwed into the female screw portion 21c of the small diameter portion 21b of the operation portion 21, thereby the large diameter portion 23b. Is inserted into an opening 27 a formed in the support portion 27. The guide protrusions 23d formed on the large-diameter portion 23b are respectively engaged with guide grooves 27b formed on the inner peripheral surface of the opening 27a of the support portion 27 so as to extend in the axial direction. The axial direction is the vertical direction in FIG. 3 or the direction in which the members are arranged. As a result, the piezoelectric element mounting portion 23 is supported by the opening 27a so as to be movable in the axial direction. In addition, the piezoelectric element attachment part 23 is arrange | positioned at the opening part 27a so that an axial direction is slidable so that the piezoelectric element 30 may extend along the short side of the housing | casing 11, for example.

  The piezoelectric element mounting portion 23 is formed with a cam surface 23e having a height difference in the axial direction on the open end surface of the large diameter portion 23b. Further, the small diameter portion 23a is formed with a plurality of sound emitting holes 23f for emitting sound generated by the displacement (vibration) of the piezoelectric element 30 at, for example, four peripherally spaced intervals. A recess 23g that engages with a locking claw 25c (to be described later) of the rotating member 25 is formed on the inner peripheral surface of the large-diameter portion 23b of the piezoelectric element mounting portion 23 in the circumferential direction. The recess 23g has a clearance d in the axial direction in a state where the locking claw 25c is locked to the lower surface of the recess 23g.

  The vibration reducing member 24 is made of, for example, a sponge having a hardness lower than that of the vibration transmitting member 22, and the end surface of the large diameter portion 23 b of the piezoelectric element mounting portion 23 is the vibration reducing member 24 at the second position of the second vibrating portion 20. Is interposed between the large diameter portion 23b of the piezoelectric element mounting portion 23 and the locking portion 12b of the opening 12a so as to contact the locking portion 12b of the opening 12a. The vibration reducing member 24 may be bonded to the large diameter portion 23b or the locking portion 12b.

  The rotating member 25 is formed of a cylindrical body having a small diameter portion 25a inserted into the large diameter portion 23b of the piezoelectric element mounting portion 23 and a large diameter portion 25b exposed from the large diameter portion 23b. At the end of the small diameter portion 25a, locking claws 25c are formed at a plurality of locations along the circumferential direction, for example, at four locations at equal intervals around the periphery. The large-diameter portion 25b includes an inclined surface 27c, which will be described later, formed on the cam surface 23e of the piezoelectric element mounting portion 23 and the support portion 27 at a plurality of locations on the outer peripheral surface, for example, at three equally spaced locations around the outer peripheral surface. A pull-in rib 25d that can be engaged with the stopper portion 27d and the second stopper portion 27e is formed. The rotating member 25 is disposed in the opening 27 a of the support portion 27 with the small diameter portion 25 a inserted into the large diameter portion 23 b of the piezoelectric element mounting portion 23 and the locking claw 25 c engaged with the recess 23 g.

  The support portion 27 is configured by a fixing member such as a rear case of the housing 11 different from the main surface 12. As described above, the opening 27a is formed in the support portion 27, and the guide groove 27b, the inclined surface 27c, the first stopper portion 27d, and the second stopper portion 27e are formed in the opening 27a. Here, in the inclined surface 27c, the first stopper portion 27d, and the second stopper portion 27e, the pull-in ribs 25d are simultaneously provided in the rotational direction of the rotating member 25, and the first stopper portion 27d, the inclined surface 27c, 2 Formed so as to be sequentially positioned on the stopper portion 27e and the inclined surface 27c. The first stopper portion 27d is for positioning the second vibrating portion 20 at the first position. The second stopper portion 27e is for positioning the second vibrating portion 20 at the second position, and is formed in a stepped shape deeper on the main surface 12 side than the first stopper portion 27d.

  The open end of the opening 27a opposite to the main surface 12 side is closed by the lid member 27f. The compression coil spring 26 is disposed in a compressed state between the bottom portion of the piezoelectric element mounting portion 23 and the lid member 27f through the cylindrical portion of the piezoelectric element mounting portion 23 and the cylindrical portion of the rotating member 25. . Thereby, the piezoelectric element attachment part 23 and the rotation member 25 are always urged | biased by the main surface 12 side.

  Hereinafter, the operation of the electronic apparatus according to this embodiment will be described.

  FIG. 4 is a partially developed cross-sectional view showing a state where the second vibration unit 20 holds the first position. In this state, each pull-in rib 25d of the rotating member 25 abuts on the first stopper portion 27d of the support portion 27, and the locking claw 25c is pressed by the urging force of the compression coil spring 26 to form the recess 23g of the piezoelectric element mounting portion 23. It is locked to the lower surface of the. The operation unit 21 is engaged with the housing 11 via the vibration transmission member 22. Therefore, in this state, when the piezoelectric element 30 is driven by an audio signal or the like to bend and vibrate (deform), the vibration is propagated to the operation unit 21 as shown in a schematic diagram in FIG. 21 vibrates and a sound is generated by the vibration. Further, the vibration of the operation unit 21 is propagated to the housing 11 via the vibration transmitting member 22, and the main surface 12 of the housing 11 vibrates, and a sound due to the vibration is generated.

  Therefore, the user can hear both the air conduction sound and the vibration sound transmitted by vibrating the ear (contact part) contacting the main surface by bringing his / her ear into contact with the main surface 12, for example. That is, this state corresponds to the first state of the housing 11 that constitutes the first vibrating section. In this way, in the first state, the main surface 12 having a larger area than the operation unit 21 vibrates together with the operation unit 21, so that the volume is increased and the bass is reduced compared to the case where only the operation unit 21 vibrates. It becomes easy to come out. Therefore, the user can listen to sound with good sound quality.

  Thereafter, from the state shown in FIG. 4, when the operation portion 21 is pushed toward the support portion 27 against the urging force of the compression coil spring 26 and the elastic force of the vibration transmitting member 22, the piezoelectric element mounting portion 23 is connected to the operation portion 21. Move down as a unit. In addition, when the housing | casing 11 has flexibility, such as an acryl, when pushing in the operation part 21, the bending of the housing | casing 11 is also added. When the piezoelectric element mounting portion 23 moves down the clearance d in the axial direction of the locking claw 25c in the recess 23g and the upper end of the locking claw 25c contacts the upper surface of the recess 23g, the rotating member 25 thereafter attaches the piezoelectric element. The unit 23 descends integrally. Then, as shown in FIG. 5, when each drawing rib 25d moves downward from the first stopper portion 27d and exceeds the inclined surface 27c of the support portion 27, each drawing rib 25d follows the cam surface 23e. To the bottom of the cam surface 23e. As a result, the rotating member 25 rotates with respect to the piezoelectric element mounting portion 23 following the pressing of the operation portion 21.

  Thereafter, when the pushing of the operation unit 21 is released, the operation unit 21 and the piezoelectric element mounting unit 23 are moved upward by the urging force of the compression coil spring 26. Then, when the piezoelectric element mounting portion 23 rises above the clearance d and the locking claw 25c is locked to the lower surface of the recess 23g, the rotating member 25 is raised integrally with the piezoelectric element mounting portion 23 thereafter. Thereby, as shown in FIG. 6, each drawing rib 25d moves away from the cam surface 23e while rotating along the inclined surface 27c of the support portion 27. Thereafter, each pull-in rib 25d falls into the groove of the second stopper portion 27e of the support portion 27 and comes into contact with the second stopper portion 27e. Thereby, the 2nd vibration part 20 is hold | maintained in the 2nd position where the operation part 21 protruded from the main surface 12 rather than the 1st position. Further, the piezoelectric element mounting portion 23 is engaged with the housing 11 via the vibration reducing member 24.

  Therefore, in this state, when the piezoelectric element 30 is driven by an audio signal or the like and vibrates (deforms), the vibration is propagated to the operation unit 21 as shown in FIG. 8B, and the operation unit 21 vibrates. Sound is generated by the vibration. However, since the housing 11 is in contact with the piezoelectric element mounting portion 23 via the vibration reducing member 24, the vibration transmitted to the housing 11 is attenuated. As a result, the main surface 12 hardly vibrates and no sound is generated.

  Therefore, the user can hear both the air conduction sound and the vibration sound transmitted by vibrating the ear (contact part) contacting the main surface by bringing his / her ear into contact with the operation unit 21. That is, this state corresponds to the second state of the casing 11 that constitutes the first vibrating section. Further, as schematically shown in FIG. 8B, the sound generated on the rotating member 25 side due to the vibration of the piezoelectric element 30 is emitted to the outside from the sound emitting hole 23f of the piezoelectric element mounting portion 23 through the opening 12a. Is done. Here, the sound generated on the rotating member 25 side by the piezoelectric element 30 and the sound generated from the operation unit 21 on the opposite side are out of phase. Preferably, the phase is reversed. Therefore, the air conduction sound that leaks to the outside from the operation unit 21 is attenuated by the air conduction sound emitted from the sound emission hole 23f, and sound leakage is reduced.

  Thereafter, when the operating portion 21 is pushed toward the support portion 27 against the urging force of the compression coil spring 26 from the state shown in FIG. 6, the piezoelectric element mounting portion 23 is lowered. When the piezoelectric element mounting portion 23 moves down the clearance d and the upper end of the locking claw 25c comes into contact with the upper surface of the concave portion 23g, the rotating member 25 is lowered integrally with the piezoelectric element mounting portion 23 thereafter. Then, as shown in FIG. 7, when each drawing rib 25d descends from the second stopper portion 27e and exceeds the inclined surface 27c of the support portion 27, each drawing rib 25d follows the cam surface 23e and cams. Move to the bottom of the surface 23e. As a result, the rotating member 25 rotates with respect to the piezoelectric element mounting portion 23 following the pressing of the operation portion 21.

  Thereafter, when the pushing of the operation unit 21 is released, the operation unit 21 and the piezoelectric element mounting unit 23 are moved upward by the urging force of the compression coil spring 26. Then, when the piezoelectric element mounting portion 23 rises above the clearance d and the locking claw 25c is locked to the lower surface of the recess 23g, the rotating member 25 is raised integrally with the piezoelectric element mounting portion 23 thereafter. Thereby, each drawing rib 25d moves away from the cam surface 23e while rotating along the inclined surface 27c of the support portion 27. Thereafter, each pull-in rib 25d falls into the first stopper portion 27d of the support portion 27 and comes into contact with the first stopper portion 27d. Thereby, the 2nd vibration part 20 is hold | maintained in the 1st position shown in FIG.

  According to the electronic device according to the present embodiment, the second vibration unit 20 is pushed from the first position to the main surface 12 side and further pushed from the first position and is urged by the compression coil spring 26. A so-called push-lock mechanism is provided that selectively holds the second position protruding from the main surface 12 ascending from the first position. And the 1st state in which the vibration sound transmitted through a part of human body with the vibration of the piezoelectric element 30 on the main surface 12 which is the 1st vibration part in the state where the 2nd vibration part 20 was held in the 1st position It can be. Further, the main surface 12 can be set to the second state in which no vibration noise is generated from the main surface 12 even when the piezoelectric element 30 vibrates in a state where the second vibration unit 20 is held at the second position. Thereby, the main surface 12 which is a 1st vibration part can be selectively used for the 1st state in which a vibration sound generate | occur | produces, and the 2nd state in which a vibration sound does not generate | occur | produce easily.

(Second Embodiment)
FIG. 9 is a cross-sectional view showing a schematic configuration of a main part of an electronic apparatus according to the second embodiment of the present invention. In the electronic device according to the present embodiment, in the configuration of the electronic device according to the first embodiment, the cross-sectional shape of the opening 12a of the main surface 12 is a parabolic shape. As shown in FIG. 9, the parabolic focus is located at or near the piezoelectric element 30 with the second vibrating portion 20 held at the second position. The cross-sectional shape of the operation unit 21 may be the same shape as that of the first embodiment, or may be similar to the cross-sectional shape of the opening 12a.

  According to such a configuration, the sound emitted from the piezoelectric element 20 through the sound emission hole 23f is reflected by the paraboloid of the opening 12a and is emitted in a substantially normal direction of the main surface 12. As a result, the number of reflections of the anti-phase sound emitted from the piezoelectric element 20 is reduced as compared with the case of the first embodiment, and the phase change of the sound due to reflection is reduced. Moreover, since the direction of sound emission from the opening 12a is substantially normal to the main surface 12, the sound generated from the operation unit 21 is attenuated more efficiently by the sound from the opening 12a, and sound leakage occurs. Is more efficiently reduced.

  In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible. For example, other known mechanisms can be adopted as the push lock mechanism of the second vibrating section 20. Moreover, the shape of the 2nd vibration part 20 seen from the main surface 12 side is not restricted circularly, It can change suitably, such as an ellipse shape, a rectangular shape, or the shape match | combined with a human ear shape. The main surface 12 that is the first vibration part may be a structure that can take a first state in which vibration sound is generated and a second state in which vibration sound is not generated. Moreover, the arrangement position of the 2nd vibration part 20 seen from the main surface 12 side can also be changed suitably. Therefore, the second vibrating section 20 may be formed at a corner of the main surface 12 or may be formed at one end of the main surface 12 as shown in FIG.

  Further, in the above embodiment, the piezoelectric element 30 is mounted on the second vibrating unit 20, and in the first state, the vibration of the piezoelectric element 30 is transmitted from the second vibrating unit 20 to the housing 11 that is the first vibrating unit. In the second state, a vibration sound is generated from the casing 11, and the piezoelectric element 30 is deformed, but the vibration of the piezoelectric element 30 is not transmitted to the casing 11, and no vibration noise is generated from the casing 11. However, the present invention is not limited to this. Not. For example, the piezoelectric element 30 is mounted on the housing 11 and the third state in which the vibration of the piezoelectric element 30 is transmitted to the second vibrating unit 20 and the fourth state in which the vibration of the piezoelectric element 30 is not transmitted to the second vibrating unit 20 The structure which can take is also possible. In this case, in the third state, vibration sound is generated from the second vibrating portion 20 due to the deformation of the piezoelectric element 30, and in the fourth state, the piezoelectric element 30 is deformed but no vibration sound is generated from the second vibrating portion 20.

  In the electronic device 1 described above, a laminated piezoelectric element is cited as an example of a vibration element that deforms or vibrates when a voltage is applied, but the present invention is not limited to this. The vibration element may be a piezoelectric element of a type different from the stacked type. For example, the vibration element may be a so-called unimorph piezoelectric element configured by attaching a single piezoelectric ceramic plate to a metal plate. The vibration element may be a so-called monomorph piezoelectric element that does not include a metal plate and is deformed by only one piezoelectric ceramic plate. The vibration element may be different from the piezoelectric element as long as it can vibrate the panel 10. The vibration element may be, for example, an electromagnetic vibration element that is mounted on a conventional dynamic speaker and includes a coil and a magnet. The vibration element may be an eccentric motor, for example.

11 Housing (first vibrating part)
DESCRIPTION OF SYMBOLS 12 Main surface 20 2nd vibration part 21 Operation part 22 Vibration transmission member 23 Piezoelectric element attachment part 24 Vibration reduction member 25 Rotating member 26 Compression coil spring 27 Support part 30 Piezoelectric element

Claims (10)

A piezoelectric element that deforms when a voltage is applied;
A first vibration unit capable of taking a first state in which vibration sound transmitted through a part of a human body is generated by deformation of the piezoelectric element and a second state in which vibration sound is not generated even when the piezoelectric element is deformed; ,
An electronic device.   The electronic device according to claim 1, wherein the first vibration unit is at least a part of a housing of the electronic device. A second vibrating portion on which the piezoelectric element is mounted;
3. The electronic device according to claim 2, wherein in the first state, the vibration sound is generated from the casing when the deformation of the piezoelectric element is transmitted from the second vibrating section to the casing.   The electronic device according to claim 3, wherein air conduction sound is generated by deformation of the piezoelectric element.   The electronic device according to claim 4, wherein in the first state, the air conduction sound is generated from the casing and the second vibrating portion.   The electronic device according to claim 5, wherein in the second state, the air conduction sound is generated from the second vibrating section, and the air conduction sound is not generated from the housing. The housing has an opening formed in a main surface,
The said 2nd vibration part is exposed to the said opening part, is fixed with respect to the said main surface in the said 1st state, and is not fixed with respect to the said main surface in the said 2nd state, Any one of Claim 3 to 6 An electronic device according to any one of the above.   8. The apparatus according to claim 7, further comprising: a vibration reducing member that is disposed between the housing and the second vibrating portion and reduces transmission of vibration from the second vibrating portion to the housing in the second state. The electronic device described.   In the second state, the second air guide is generated in which the first air conduction sound generated from the main surface side of the second vibration unit is propagated from the second vibration unit to the main surface side through the opening. The electronic device according to claim 7, wherein the electronic device is attenuated by sound. The electronic device according to claim 9, wherein a cross-sectional shape of the opening is a parabolic shape.

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