WO2013145739A1 - 電子機器、パネルユニット - Google Patents
電子機器、パネルユニット Download PDFInfo
- Publication number
- WO2013145739A1 WO2013145739A1 PCT/JP2013/002089 JP2013002089W WO2013145739A1 WO 2013145739 A1 WO2013145739 A1 WO 2013145739A1 JP 2013002089 W JP2013002089 W JP 2013002089W WO 2013145739 A1 WO2013145739 A1 WO 2013145739A1
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- WO
- WIPO (PCT)
- Prior art keywords
- panel
- electronic device
- piezoelectric element
- sound
- human body
- Prior art date
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/016—Input arrangements with force or tactile feedback as computer generated output to the user
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M19/00—Current supply arrangements for telephone systems
- H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
- H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations
- H04M19/047—Vibrating means for incoming calls
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/06—Plane diaphragms comprising a plurality of sections or layers
- H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/15—Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
- H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
Definitions
- the present invention relates to an electronic device that vibrates a panel by applying a predetermined electrical signal (sound signal) to a piezoelectric element and transmits the vibration of the panel to a human body to transmit air conduction sound and human body vibration sound to a user.
- a predetermined electrical signal sound signal
- Patent Document 1 describes an electronic device such as a mobile phone that conveys air conduction sound and bone conduction sound to a user.
- 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.
- Patent Document 1 describes that human body vibration sound is sound transmitted to the user's auditory nerve through a part of the user's body (for example, the cartilage of the outer ear) that contacts the vibrating object. ing.
- Patent Document 1 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 bends and vibrates as the piezoelectric material expands and contracts in the longitudinal direction, and the user contacts the vibrating body with the auricle. It is described that air conduction sound and human body vibration sound are transmitted to the user.
- Patent Document 1 does not consider adjusting the frequency characteristics of air conduction sound and human body vibration sound.
- An object of the present invention is to provide an electronic device capable of adjusting the frequency characteristics of air conduction sound and human body vibration sound.
- An electronic apparatus includes a panel, a piezoelectric element, a casing to which the panel is attached, and a member attached to the piezoelectric element, and the member and the panel are caused by deformation of the piezoelectric element.
- An air conduction sound and a human body vibration sound are transmitted to an object that deforms and contacts the deforming panel, and the frequency characteristics of the air conduction sound and the human body vibration sound are adjusted by the member. .
- the frequency characteristic dip of the air conduction sound and the human body vibration sound may deviate from the frequency band of the sound assumed to be used for the electronic device.
- the member may be disposed between the panel and the piezoelectric element, and the piezoelectric element and the member may be joined by a first joining member.
- the member may be made of glass fiber and resin, metal fiber and resin, or carbon fiber and resin.
- the panel vibrates in a region wider than a region having a length corresponding to the distance from the lower leg of the human ear to the antitragus and a width corresponding to the distance from the tragus to the antique. May be.
- the member may be joined to the panel by a second joining member.
- the first joining member may be a non-heating type curable adhesive.
- the first joining member may be a double-sided tape.
- the second bonding member may be a non-heating type curable adhesive.
- the second joining member may be a double-sided tape.
- the panel may be joined to the housing by a third joining member.
- the third bonding member may be a non-heating type curable adhesive.
- the third joining member may be a double-sided tape.
- the panel may constitute a part or all of any of a display panel, an operation panel, a cover panel, and a lid panel for making the rechargeable battery removable.
- the piezoelectric element may be disposed outside a display area for the display function.
- the panel may be deformed to transmit air conduction sound and human vibration sound in any part of the panel.
- the panel has a plurality of locations that vibrate in a direction intersecting with the main surface of the panel in the vibration region, and the amplitude value of the vibration is increased from plus to minus with time or vice versa at each location. May vary.
- the member may be made of metal.
- a panel unit according to the present invention includes a panel, a piezoelectric element, and a member attached to the piezoelectric element.
- the member and the panel are deformed due to deformation of the piezoelectric element, and contact the deformed panel.
- the air conduction sound and the human body vibration sound are transmitted to the object to be performed, and the frequency characteristics of the air conduction sound and the human body vibration sound are adjusted by the member.
- the member may be made of metal.
- the electronic device can adjust the frequency characteristics of air conduction sound and human body vibration sound.
- FIG. 1 is a diagram showing functional blocks of an electronic device 1 according to an embodiment of the present invention.
- the electronic device 1 is, for example, a mobile phone (smart phone), and includes a panel 10, a display unit 20, a piezoelectric element 30, an input unit 40, and a control unit 50.
- the panel 10 is a touch panel that detects contact, a cover panel that protects the display unit 20, or the like.
- the panel 10 is made of, for example, glass or a synthetic resin such as acrylic.
- the shape of the panel 10 may be a plate shape.
- the panel 10 may be a flat plate or a curved panel whose surface is smoothly inclined.
- a detection method of the touch panel any method such as a capacitance method, a resistance film method, a surface acoustic wave method (or an ultrasonic method), an infrared method, an electromagnetic induction method, and a load detection method can be used.
- the display unit 20 is a display device such as a liquid crystal display, an organic EL display, or an inorganic EL display.
- the display unit 20 is provided on the back surface of the panel 10.
- the display unit 20 is disposed on the back surface of the panel 10 by a bonding member (for example, an adhesive).
- the display unit 20 may be bonded to the panel 10 with a bonding member (for example, an adhesive), or may be spaced apart from the panel 10 and supported by the casing of the electronic device 1.
- the piezoelectric element 30 is an element that expands or contracts (bends) according to the electromechanical coupling coefficient of the constituent material by applying an electric signal (voltage).
- the piezoelectric element 30 may be a unimorph, bimorph, or multilayer piezoelectric element.
- the stacked piezoelectric element includes a stacked unimorph element in which unimorphs are stacked (for example, 16 layers or 24 layers), or a stacked bimorph element in which bimorphs are stacked (for example, 16 layers or 24 layers are stacked).
- the laminated piezoelectric element is composed of a laminated structure of a plurality of dielectric layers made of, for example, PZT (lead zirconate titanate) and electrode layers arranged between the plurality of dielectric layers.
- PZT lead zirconate titanate
- a unimorph expands and contracts when an electric signal (voltage) is applied, and a bimorph bends when an electric signal (voltage) is applied.
- the piezoelectric element 30 is disposed on the back surface of the panel 10 (the surface on the inner side of the electronic device 1).
- the piezoelectric element 30 is attached to the panel 10 by a joining member (for example, double-sided tape).
- the piezoelectric element 30 may be attached to the panel 10 via an adjustment member (for example, sheet metal, glass fiber and resin, metal fiber and resin, or carbon fiber and resin) for adjusting the frequency characteristics of sound. .
- the piezoelectric element 30 is spaced from the inner surface of the housing 60 by a predetermined distance while being disposed on the back surface of the panel 10.
- the piezoelectric element 30 may be separated from the surface on the inner side of the housing 60 by a predetermined distance even in a stretched or bent state. That is, the distance between the piezoelectric element 30 and the inner surface of the housing 60 is preferably larger than the maximum deformation amount of the piezoelectric element 30.
- the input unit 40 receives an operation input from the user, and includes, for example, an operation button (operation key).
- an operation button operation key
- the panel 10 can also accept the operation input from a user by detecting the contact from a user.
- the control unit 50 is a processor that controls the electronic device 1.
- the controller 50 applies a predetermined electrical signal (voltage corresponding to the audio signal) to the piezoelectric element 30.
- the voltage applied to the piezoelectric element 30 by the control unit 50 is, for example, ⁇ 15 V, which is higher than ⁇ 5 V, which is an applied voltage of a so-called panel speaker for the purpose of conducting sound by air conduction sound instead of human body vibration sound. It may be.
- ⁇ 15 V which is higher than ⁇ 5 V
- a so-called panel speaker for the purpose of conducting sound by air conduction sound instead of human body vibration sound. It may be.
- the panel 10 is sufficiently vibrated to generate It is possible to generate a human body vibration sound through the section.
- the piezoelectric element 30 expands or contracts or bends in the longitudinal direction.
- the panel 10 to which the piezoelectric element 30 is attached is deformed in accordance with expansion / contraction or bending of the piezoelectric element 30, and the panel 10 vibrates.
- the panel 10 is bent by expansion / contraction or bending of the piezoelectric element 30.
- the panel 10 is bent directly by the piezoelectric element 30.
- the panel 10 is directly bent by the piezoelectric element means that the panel is specified by the inertial force of the piezoelectric actuator configured by arranging the piezoelectric element in the casing as used in a conventional panel speaker. This is different from the phenomenon in which the panel is deformed by exciting the region.
- the panel 10 is bent directly by the piezoelectric element means that the expansion or contraction or bending (curving) of the piezoelectric element is directly applied to the panel via the bonding member or via the bonding member and the reinforcing member 80 described later. Means bending.
- the panel 10 generates air conduction sound and, when the user contacts a part of the body (for example, cartilage of the outer ear), generates a human body vibration sound through the part of the body.
- the control unit 50 can generate an air conduction sound and a human body vibration sound corresponding to the voice signal by applying an electrical signal corresponding to the voice signal related to the voice of the other party to the piezoelectric element 30, for example.
- the audio signal may relate to a ringing melody or a music piece including music. Note that the audio signal applied to the electrical signal may be based on music data stored in the internal memory of the electronic device 1, or music data stored in an external server or the like is reproduced via a network. May be.
- the panel 10 vibrates not only in the attachment region to which the piezoelectric element 30 is attached, but also in a region away from the attachment region.
- the panel 10 has a plurality of locations that vibrate in a direction intersecting the main surface of the panel 10 in the vibrating region, and the amplitude value of the vibration is increased from positive to negative with time in each of the plurality of locations. Or vice versa.
- the panel 10 vibrates in such a manner that a portion having a relatively large vibration amplitude and a portion having a relatively small vibration amplitude are distributed randomly or periodically throughout the panel 10 at first glance. That is, vibrations of a plurality of waves are detected over the entire panel 10.
- the control unit 50 does not attenuate the piezoelectric element 30 in order to prevent the above-described vibration of the panel 10 from being attenuated.
- the applied voltage may be ⁇ 15V. Therefore, the user can hear the sound by bringing his / her ear into contact with a region away from the above-described region where the panel 10 is attached.
- the panel 10 may be approximately the same size as the user's ear.
- the panel 10 may be larger than the user's ear, as shown in FIG.
- Panel 10 is an area wider than an area having a length corresponding to the distance from the lower leg of the anti-annulus (lower anti-limb) to the anti-tragus and a width corresponding to the distance from the tragus to the anti-annulus. Should just vibrate.
- the panel 10 preferably has a length corresponding to the distance between a portion near the upper leg of the ankle ring (upper pair leg) in the ear ring and the earlobe, and a distance between the tragus and a portion near the ear ring in the ear ring. It suffices that a region having a width corresponding to is vibrated.
- the region having the above length and width may be a rectangular region, or may be an elliptical shape having the above length as the major axis and the above width as the minor axis.
- the average size of Japanese ears can be found by referring to the Japanese human body size database (1992-1994) created by the Human Life Engineering Research Center (HQL). If the panel 10 is larger than the average size of Japanese ears, the panel 10 is considered to be large enough to cover the entire foreign ear.
- the electronic device 1 can transmit air conduction sound and human body vibration sound via a part of the user's body (for example, cartilage of the outer ear) to the user by the vibration of the panel 10. Therefore, when outputting a sound having a volume equivalent to that of a conventional dynamic receiver, the sound transmitted to the periphery of the electronic device 1 due to the vibration of the air due to the vibration of the panel 10 is less than that of the dynamic receiver. Therefore, it is suitable, for example, when listening to a recorded message on a train or the like.
- the electronic device 1 transmits a human body vibration sound by the vibration of the panel 10, even if the user wears an earphone or a headphone, for example, the user can bring the earphone into contact with the electronic device 1 by touching them. Or you can hear sound through headphones and body parts.
- the electronic device 1 transmits sound to the user by the vibration of the panel 10. Therefore, when the electronic device 1 does not include a separate dynamic receiver, it is not necessary to form an opening (sound outlet) for sound transmission in the housing, and the waterproof structure of the electronic device 1 can be simplified.
- the sound emission port is preferably closed by a member that allows gas to pass but not liquid.
- a member that allows gas to pass but not liquid is Gore-Tex (registered trademark).
- FIG. 3 is a diagram illustrating a mounting structure of the electronic device 1 according to the first embodiment.
- 3A is a front view
- FIG. 3B is a cross-sectional view taken along line bb in FIG. 3A.
- the electronic device 1 shown in FIG. 3 is a smartphone in which a touch panel, which is a glass plate, is arranged as a panel 10 on the front surface of a housing 60 (for example, a metal or resin case).
- the panel 10 and the input unit 40 are supported by a housing 60, and the display unit 20 and the piezoelectric element 30 are bonded to the panel 10 by a joining member 70, respectively.
- the joining member 70 is an adhesive having a thermosetting property or an ultraviolet curable property, a double-sided tape, or the like, and may be, for example, an optical elastic resin that is a colorless and transparent acrylic ultraviolet curable adhesive.
- the panel 10, the display part 20, and the piezoelectric element 30 are each substantially rectangular.
- the display unit 20 is disposed approximately at the center of the panel 10 in the short direction.
- the piezoelectric element 30 is disposed at a predetermined distance from an end portion in the longitudinal direction of the panel 10 and is arranged in the vicinity of the end portion so that the longitudinal direction of the piezoelectric element 30 is along the short side of the panel 10.
- the display unit 20 and the piezoelectric element 30 are arranged side by side in a direction parallel to the inner surface of the panel 10.
- FIG. 4 is a diagram illustrating an example of vibration of the panel 10 of the electronic device 1 according to the first embodiment.
- the display unit 20 is attached to the panel 10.
- the lower part of the panel 10 is less likely to vibrate than the upper part of the panel 10 to which the piezoelectric element 30 is attached. Therefore, sound leakage due to vibration of the lower portion of the panel 10 at the lower portion of the panel 10 can be reduced.
- the upper part of the panel 10 is directly bent by the piezoelectric element 30, and the vibration is attenuated at the lower part as compared with the upper part.
- the panel 10 is bent by the piezoelectric element 30 so that the portion directly above the piezoelectric element 30 protrudes higher than the surrounding area in the long side direction of the piezoelectric element 30.
- the panel 10 is deformed due to the deformation of the piezoelectric element 30 attached to the back surface of the panel 10, and the object that contacts the deformed panel 10 is detected. It conveys air conduction sound and human body vibration sound. Thereby, the air conduction sound and the human body vibration sound can be transmitted to the user without causing the vibrating body to protrude from the outer surface of the housing 60.
- the piezoelectric element 30 itself is not easily damaged. Further, when the case 60 is deformed instead of the panel 10, the user tends to drop the terminal when generating vibration, whereas when the panel 10 is vibrated, Things are hard to happen.
- FIG. 5 is a diagram illustrating a mounting structure of the electronic device 1 according to the second embodiment.
- 5A is a front view
- FIG. 5B is a cross-sectional view taken along line bb in FIG. 5A
- FIG. 5C is taken along line cc in FIG. 5A. It is sectional drawing.
- the electronic device 1 shown in FIG. 5 is a foldable mobile phone in which a cover panel (acrylic plate) that protects the display unit 20 as a panel 10 is arranged on the front surface of the upper housing 60.
- an adjustment member 80 is disposed between the panel 10 and the piezoelectric element 30.
- the adjustment member 80 is an elastic member such as rubber or silicon.
- the adjustment member 80 may be formed of, for example, a conductive material.
- the adjustment member 80 may be, for example, a copper plate, an iron plate, or a phosphor bronze plate.
- the adjustment member 80 may be a metal plate made of, for example, aluminum having a certain degree of elasticity.
- the adjustment member 80 may be a stainless steel plate such as SUS304.
- the adjustment member 80 may be made of a plurality of types of metals such as a metal plate obtained by silver plating on a copper plate or a plate obtained by laminating a copper plate and an aluminum plate.
- the thickness of a metal plate such as a stainless steel plate is suitably 0.2 mm to 0.8 mm, for example, depending on the voltage value applied to the piezoelectric element 30 and the like.
- the adjustment member 80 may be a resin plate, for example.
- a polyamide-type resin is mentioned, for example.
- the polyamide-based resin include Reny (registered trademark), which is made of a crystalline thermoplastic resin obtained from metaxylylenediamine and adipic acid and is rich in strength and elasticity.
- Reny registered trademark
- Such a polyamide-based resin may be a reinforced resin reinforced with glass fiber, metal fiber, carbon fiber, or the like using itself as a base polymer. The strength and elasticity are appropriately adjusted according to the amount of glass fiber, metal fiber, carbon fiber, or the like added to the polyamide-based resin.
- the reinforced resin as described above is formed, for example, by impregnating a resin into a base material formed by braiding glass fiber, metal fiber, carbon fiber, or the like and curing it.
- the reinforced resin may be formed by mixing a finely cut fiber piece into a liquid resin and then curing it.
- the reinforced resin may be a laminate of a base material in which fibers are knitted and a resin layer.
- the electronic device 1 according to the second embodiment has a structure in which the piezoelectric element 30 and the adjustment member 80 are bonded by the bonding member 70, and the adjustment member 80 and the panel 10 are bonded by the bonding member 70.
- the display unit 20 is not bonded to the panel 10 but is supported by the housing 60. That is, in the electronic device 1 according to the second embodiment, the display unit 20 is separated from the panel 10, and the display unit 20 and the support unit 90 that is a part of the housing 60 are bonded by the bonding member 70. It is a structure.
- the support part 90 is not limited to the structure as a part of the housing
- FIG. 6 is a diagram illustrating an example of vibration of the panel 10 of the electronic apparatus 1 according to the second embodiment.
- the panel 10 is an acrylic plate having a lower rigidity than the glass plate, and the display unit 20 is not bonded to the back surface of the panel 10.
- the amplitude generated by the piezoelectric element 30 is increased.
- the panel 10 vibrates not only in the attachment region to which the piezoelectric element 30 is attached, but also in a region away from the attachment region. For this reason, in addition to the air conduction sound through the air, the user can hear the human body vibration sound by bringing his / her ear into contact with an arbitrary position of the panel 10.
- FIG. 7 is a diagram illustrating an example of a change in frequency characteristics due to the adjustment member 80.
- FIG. 7 shows frequency characteristics when a sheet metal such as SUS304 is used as the adjusting member 80 and frequency characteristics when reinforced resin such as Reny is used as the adjusting member 80. .
- the horizontal axis represents frequency and the vertical axis represents sound pressure.
- the resonance point when using reinforced resin is about 2 kHz, and the resonance point when using sheet metal is about 1 kHz.
- the dip when using reinforced resin is about 4 kHz, and the dip when using sheet metal is about 3 kHz.
- the resonance point of the panel 10 is located in a higher frequency region and the frequency characteristic dip is located in a higher frequency region, compared to the case where a sheet metal is used.
- the frequency band used for the voice call of the cellular phone is 300 Hz to 3.4 kHz
- the dip can be removed from the use frequency band when the reinforced resin is used as the adjustment member 80.
- the adjusting member 80 the dip can be removed from the frequency band of use of the electronic device 1 by appropriately adjusting the type or composition of the metal constituting the sheet metal or the thickness of the sheet metal.
- the reinforced resin can reduce the influence on the antenna performance as compared with the sheet metal.
- the adjustment member 80 is disposed in the vicinity of the contact portion between the housing 60 and the panel 10, and is electrically connected to a reference potential portion (GND) (not shown).
- GND reference potential portion
- the stainless steel plate or the phosphor bronze plate can be operated as an antenna element by being electrically connected to a power supply unit (not shown).
- the adjustment member 80 and the panel 10 are deformed due to the deformation of the piezoelectric element 30 attached to the back surface of the panel 10 via the adjustment member 80,
- the air conduction sound and the human body vibration sound are transmitted to the object that contacts the deformed panel 10.
- the air conduction sound and the human body vibration sound can be transmitted to the user without causing the vibrating body to protrude from the outer surface of the housing 60.
- the adjusting member 80 it is possible to move the resonance frequency and adjust the frequency characteristic of the sound.
- the adjustment member 80 causes the frequency characteristic dip of the air conduction sound and the human body vibration sound to deviate from the frequency band of the sound assumed to be used by the electronic device 1.
- the adjustment member 80 allows the dip position to escape from the call band (for example, 300 Hz to 3.4 kHz), thereby improving the frequency characteristics of the call band.
- the panel 10 is deformed to transmit the air conduction sound and the human body vibration sound not only in the attachment region where the piezoelectric element 30 is attached but also in any part of the panel 10. For this reason, the user can hear the human body vibration sound by bringing his / her ear into contact with an arbitrary position of the panel 10 in addition to the air conduction sound via air.
- the adjustment member 80 is joined to the panel 10 by the joining member 70.
- the adjustment member 80 can be attached to the panel 10 in a state in which the degree of freedom of deformation of the piezoelectric element 30 is difficult to be hindered.
- the joining member 70 can be a non-heating type curable adhesive. Thereby, there is an advantage that thermal stress shrinkage hardly occurs between the piezoelectric element 30 and the panel 10 at the time of curing.
- the joining member 70 can be a double-sided tape. Thereby, there is an advantage that contraction stress is hardly applied between the piezoelectric element 30 and the panel 10 as in the case of using an adhesive.
- the adjusting member 80 between the piezoelectric element 30 and the panel 10, for example, when an external force is applied to the panel 10, the external force is transmitted to the piezoelectric element 30 and the piezoelectric element 30 may be damaged. Can be reduced. Moreover, even if the panel 10 is brought into strong contact with the human body, the vibration of the panel 10 can be hardly attenuated. Further, by arranging the adjustment member 80 between the piezoelectric element 30 and the panel 10, the resonance frequency of the panel 10 is lowered, and the acoustic characteristics in the low frequency band are improved. Instead of the adjustment member 80, a plate-like weight may be attached to the piezoelectric element 30 by the joining member 70.
- the panel 10 may be joined to the housing 60 by a joining member 70.
- the joining member 70 can be a non-heating type curable adhesive. Accordingly, there is an advantage that thermal stress shrinkage hardly occurs between the housing 60 and the panel 10 at the time of curing.
- the joining member 70 can be a double-sided tape. Thereby, there exists an advantage that the shrinkage stress like the time of use of an adhesive agent does not generate
- the piezoelectric element 30 may be disposed at the center of the panel 10.
- the vibration of the piezoelectric element 30 is evenly transmitted to the entire panel 10 to improve the quality of the air conduction sound, and the user can listen to various positions of the panel 10.
- the human body vibration sound can be recognized even if it is touched.
- a plurality of piezoelectric elements 30 may be mounted.
- the piezoelectric element 30 is attached to the panel 10, but may be attached to a location different from the panel 10.
- the piezoelectric element 30 may be attached to a battery lid that is attached to the housing 60 and covers the battery. Since the battery lid is often attached to a surface different from the panel 10 in the electronic device 1 such as a mobile phone, according to such a configuration, the user places a part of the body (for example, an ear) on the surface different from the panel 10. You can hear the sound by touching.
- the panel 10 can constitute a part or all of any of a display panel, an operation panel, a cover panel, and a lid panel for making the rechargeable battery removable.
- the piezoelectric element 30 is disposed outside the display area for the display function. As a result, there is an advantage that the display is hardly disturbed.
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- Signal Processing (AREA)
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- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- Acoustics & Sound (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Telephone Set Structure (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
図3は第1の実施形態に係る電子機器1の実装構造を示す図である。図3(a)は正面図、図3(b)は図3(a)におけるb-b線に沿った断面図である。図3に示す電子機器1はパネル10としてガラス板であるタッチパネルが筐体60(例えば金属や樹脂のケース)の前面に配されたスマートフォンである。パネル10及び入力部40は筐体60に支持され、表示部20および圧電素子30は、それぞれ接合部材70によりパネル10に接着されている。接合部材70は、熱硬化性あるいは紫外線硬化性等を有する接着剤や両面テープ等であり、例えば無色透明のアクリル系紫外線硬化型接着剤である光学弾性樹脂でもよい。パネル10、表示部20および圧電素子30は、それぞれ略長方形状である。
図5は第2の実施形態に係る電子機器1の実装構造を示す図である。図5(a)は正面図、図5(b)は図5(a)におけるb-b線に沿った断面図、図5(c)は図5(a)におけるc-c線に沿った断面図である。図5に示す電子機器1はパネル10として表示部20を保護するカバーパネル(アクリル板)が上側の筐体60の前面に配された折りたたみ式の携帯電話である。第2の実施形態では、パネル10と圧電素子30との間には、調整部材80が配置される。調整部材80は、例えばゴムまたはシリコン等の弾性部材である。調整部材80は、例えば導電性材料により形成されていてもよい。調整部材80は、例えば銅板、鉄板、またはリン青銅板であってもよい。調整部材80は、例えばある程度の弾性を有するアルミニウム等から成る金属板であってもよい。調整部材80は、例えばSUS304等のステンレス板であってもよい。調整部材80は、例えば銅板に銀メッキを施した金属板または銅板とアルミニウム板を積層した板等、複数の種類の金属から構成されてもよい。ステンレス板等の金属板の厚さは、圧電素子30に印加される電圧値等に応じて、例えば0.2mm~0.8mmのものが適宜用いられる。調整部材80は、例えば樹脂製の板であってもよい。ここでいう樹脂製の板を形成する樹脂としては、例えばポリアミド系樹脂が挙げられる。ポリアミド系樹脂には、例えば、メタキシリレンジアミンとアジピン酸とから得られる結晶性の熱可塑性樹脂から成り、強度および弾性に富むレニー(登録商標)がある。このようなポリアミド系樹脂は、それ自体をベースポリマーとして、ガラス繊維、金属繊維または炭素繊維等により強化された強化樹脂であってもよい。ポリアミド系樹脂に対するガラス繊維、金属繊維または炭素繊維等の付加量に応じて、強度および弾性が適宜調整される。上記のような強化樹脂は、例えば、ガラス繊維、金属繊維または炭素繊維等を編みこんで形成された基材に樹脂を含浸させ、硬化させて形成される。強化樹脂は、液状の樹脂に細かく切断された繊維片を混入させたのちに硬化させて形成されるものであってもよい。強化樹脂は、繊維を編みこんだ基材と樹脂層とを積層したものであってもよい。
10 パネル
20 表示部
30 圧電素子
40 入力部
50 制御部
60 筐体
70 接合部材
80 調整部材
90 支持部
Claims (20)
- パネルと、
圧電素子と、
前記パネルが取り付けられる筐体と、
前記圧電素子に取り付けられる部材と、を備え、
前記圧電素子の変形に起因して前記部材及び前記パネルが変形し、当該変形するパネルに接触する対象物に対して気導音と人体振動音とを伝え、
前記部材により、前記気導音および人体振動音の周波数特性が調整される、電子機器。 - 前記部材により、前記気導音と人体振動音との周波数特性のディップが、前記電子機器の使用が想定された音の周波数帯から外れている、
請求項1に記載の電子機器。 - 前記部材は、前記パネルと前記圧電素子との間に配置され、
前記圧電素子と前記部材とが第1接合部材により接合されている、
請求項1に記載の電子機器。 - 前記部材は、ガラス繊維及び樹脂、あるいは金属繊維及び樹脂、あるいは炭素繊維及び樹脂からなる、
請求項1に記載の電子機器。 - 前記パネルは、人間の耳の対耳輪下脚から対耳珠までの間の距離に相当する長さと、耳珠から対耳輪までの間の距離に相当する幅とを有する領域よりも広い領域が振動する、
請求項1に記載の電子機器。 - 前記部材は、前記パネルに第2接合部材により接合されている、
請求項1に記載の電子機器。 - 前記第1接合部材は、非加熱型硬化性の接着剤である、
請求項3に記載の電子機器。 - 前記第1接合部材は、両面テープである、
請求項3に記載の電子機器。 - 前記第2接合部材は、非加熱型硬化性の接着剤である、
請求項6に記載の電子機器。 - 前記第2接合部材は、両面テープである、
請求項6に記載の電子機器。 - パネルは、筐体に第3接合部材により接合されている、
請求項1に記載の電子機器。 - 前記第3接合部材は、非加熱型硬化性の接着剤である、
請求項11に記載の電子機器。 - 前記第3接合部材は、両面テープである
請求項11に記載の電子機器。 - 前記パネルは、表示パネル、操作パネル、カバーパネル、充電池を取り外し可能とするためのリッドパネルのいずれかの一部または全部を構成する、
請求項1に記載の電子機器。 - 前記パネルが表示パネルのとき、
前記圧電素子は、当該表示機能のための表示領域の外側に配置されている、
請求項14に記載の電子機器。 - 前記パネルは、当該パネルのいずれの箇所においても気導音および人体振動音を伝えるための変形が発生する、請求項1に記載の電子機器。
- 前記パネルは、その振動領域において、当該パネルの主面と交差する方向に振動する箇所を複数有し、当該箇所の各々において、前記振動の振幅の値が時間とともにプラスからマイナスに、あるいはその逆に変動する
請求項1に記載の電子機器。 - 前記部材は、金属製である、
請求項1に記載の電子機器。 - パネルと、
圧電素子と、
前記圧電素子に取り付けられる部材と、を備え、
前記圧電素子の変形に起因して前記部材及び前記パネルが変形し、当該変形するパネルに接触する対象物に対して気導音と人体振動音とを伝え、
前記部材により、前記気導音および人体振動音の周波数特性が調整される、パネルユニット。 - 前記部材は、金属製である、
請求項19に記載のパネルユニット。
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