JP2010110011A - Equipment with speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect a panel-like diaphragm by accommodating the panel-like diaphragm in a cover member. <P>SOLUTION: Equipment with a speaker includes a speaker 1 comprising a panel-like diaphragm 10 and a plurality of driver units 11. The panel-like diaphragm 10 is accommodated in a box-like cover 8, has rigidity and generates a partial bending operation. The plurality of driver units 11 are mounted on the panel-like diaphragm 10 and generate the partial bending operation on the panel-like diaphragm 10 on the basis of a playback input signal. Regarding the panel-like diaphragm 10, an outer circumferential part 10c is disposed in an opening, surrounded by a circumferential side plate of the box-like cover 8, in a non-restricted state while being spaced apart by a predetermined distance from an inner peripheral wall of the circumferential side plate of the box-like cover 8, and the panel-like diaphragm 10 is driven by the driver units 11 to emit playback sounds. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a device having a speaker, such as an electronic notebook device, a handy personal computer, or various portable information terminal devices.

  Devices incorporating a speaker device are used not only in audio equipment but also in many technical fields such as computer devices and terminal devices thereof. In many devices, a casing device is configured by a casing and a lid that is rotatably coupled to the casing via a hinge mechanism. The casing is a lid when not in use. Occluded by the body.

  For example, electronic notebook devices, handy personal computers or various portable information terminal devices generally have a display unit, a control unit, a communication unit, etc. in the device body, and also protect the display unit when it is carried or unused. In order to do this, a lid that is rotatable with respect to the device body is provided. Electronic notebook devices and the like have been expanded in various ways in terms of software enhancement, and not only data information processing but also audio information processing along with image information has become extremely important. For this reason, for electronic notebook devices, etc., playback input signals such as voice information supplied from computer devices, etc. are played back, voice guides from discs that report or load stored data contents, warnings, etc. Built-in speaker device.

  As the speaker device, a cone type dynamic speaker, a horn type dynamic speaker, or the like is generally used. For example, a cone-type dynamic speaker includes a diaphragm formed in a conical shape, a driver unit that drives the diaphragm, a frame that supports the outer peripheral edge of the diaphragm, and a cabinet that houses these members. Consists of members. The driver unit is composed of members such as a voice coil, a pole, a plate, a magnet, a damper and a center cap.

  The diaphragm is formed in a basic shape with the above-described cone shape by a light material having a large internal loss, and a driver unit is disposed at the center thereof. In general, the thickness of the diaphragm is gradually reduced from the inner peripheral portion toward the outer peripheral portion, and the outer peripheral edge portion is supported by the frame through an arrowhead over the entire periphery. The frame is a member that couples the diaphragm and the driver and also has a function of protecting the diaphragm. The frame is generally formed with a notch window so that the diaphragm is not affected by the reaction caused by the vibration operation. The sheet paper acts to hold the outer peripheral edge of the diaphragm and not to come into contact with the cabinet mounting when the diaphragm vibrates.

  On the other hand, the horn type dynamic speaker expands and emits the vibration sound of the diaphragm driven by the voice coil by the horn, and the basic configuration other than having the horn is the above-mentioned cone type dynamic speaker. It is equivalent to a speaker. That is, even in a horn type dynamic speaker, a magnet, a pole integrally assembled to the tip thereof, a yoke surrounding the pole, and a plate assembled to the yoke having an opening facing the pole. A driver unit is configured, and the diaphragm is vibrated by the driver unit.

  The diaphragm is formed in a spherical shape with a light metal such as aluminum or a synthetic resin. The diaphragm has its outer peripheral edge coupled to the plate so as to face the pole by closing the opening. The diaphragm is smaller than the diaphragm of the cone-type dynamic speaker described above and has high mechanical rigidity because the resonance of the vibration system may be in the substantially central region of the reproduction band. Therefore, the diaphragm is coupled to the plate without a damper, and the periphery thereof is vibrated by the driver unit. In other words, also in the horn type dynamic speaker, the diaphragm is supported with the outer peripheral edge portion fixed like the diaphragm of the cone type dynamic speaker.

  By the way, in the speaker device, many attempts have been made to realize a so-called panel-type speaker device that is thin without requiring a box or the like and can be installed at a free position. However, many of these attempts have not yet achieved an ideal panel-type speaker device due to technical limitations and acoustic performance limitations. Many of these attempts are based on the cone-type dynamic speaker and the horn-type dynamic speaker described above.

  As a thin speaker device, for example, a capacitor type speaker is known in which a panel-shaped diaphragm is disposed to face a fixed pole with a minute interval. A capacitor type speaker is generally formed by forming a metal thin film on a diaphragm and applying a DC bias voltage of several hundred volts between the diaphragm and a fixed pole. When a reproduction signal is input to the fixed pole, the diaphragm vibrates due to a change in magnetic attractive force between the fixed pole and the diaphragm. In addition, as a capacitor type speaker, a push-pull type speaker is also provided which is adapted for use in the entire band by arranging a fixed pole across a diaphragm.

  As described above, since it is necessary to apply a voltage of several hundreds of volts to the sound emitting unit, it is difficult to install a condenser type speaker anywhere, and it is stable due to changes in temperature and humidity conditions. It has the problem that the property is low. In addition, the capacitor type speaker has a problem that the maximum undistorted output sound pressure level obtained with respect to the input voltage is smaller than that of the above-described dynamic speaker device because the input voltage is regulated to a DC bias voltage. Furthermore, the capacitor type speaker has various problems such as an increase in the size of the diaphragm in order to ensure stable frequency characteristics in the entire band.

Japanese National Patent Publication No. 11-512246 Japanese National Patent Publication No. 11-512251

  In electronic notebook devices, etc., it is generally difficult to incorporate a large speaker device that can reproduce and output a reproduction input signal such as audio information with sufficient volume and good sound quality due to conditions such as internal space and cost. Met. Therefore, a conventional electronic notebook device or the like has a built-in small speaker device having a function of simply reproducing and outputting a reproduction input signal such as audio information, and cannot secure a sufficient volume. There were problems such as missing or not being able to hear clearly.

  Some electronic notebook devices, for example, have a function as an acoustic device, but the built-in speaker device is not expected to have a good acoustic characteristic, so that the function cannot be fully exhibited. It was. An electronic notebook device or the like is also provided with a function of connecting, for example, a large external speaker device in order to complement the built-in speaker device described above. However, it is no exaggeration to say that such an external speaker device is hardly used because it requires an optional member for connection and the connection operation is troublesome. As described above, in an electronic notebook device or the like, an inexpensive speaker device that is small and thin and does not require a large installation space and can reproduce a reproduction input signal such as audio information with sufficient volume and good sound quality is required. It had been.

  In general, it is considered that when a reproduction input signal is supplied to a speaker device, a diaphragm is operated like a piston by a driver unit to perform output reproduction. Therefore, in the panel type speaker device, an attempt has been made to produce a high-accuracy planar diaphragm that operates in the same manner as the diaphragm of the conventional speaker device described above by using an electromagnetic drive method or an electrostatic drive method. For example, in an electrostatic drive type diaphragm, an outer peripheral portion is supported with a predetermined tension, and when a driving force is applied from a driver unit, waves are continuously generated concentrically from the driving position. . Such diaphragms have to solve various problems due to large area piston motion that causes sound concentration and uncontrollable vibration by operating as a large single phase diaphragm.

  On the other hand, as a panel type speaker device, a speaker device having a novel panel structure in which a diaphragm is driven by a driver unit based on a bending wave theory has been proposed. In this new panel type speaker device, the diaphragm is composed of a rigid panel structure with relatively large mechanical rigidity, and when a driving force is applied from the driver unit, a complex vibration mode is generated on the entire surface of the diaphragm. Is done. The vibration mode has the most complicated and dense corrugated structure uniformly distributed in the operating frequency range of the flat panel (diaphragm). The novel panel-type speaker device is characterized by an analysis of the physical characteristics of bending waves, the speed versus frequency characteristics of the waves, and the driving point impedance characteristics for a finite size diaphragm.

  The new panel type speaker device uses a flexural rigidity diaphragm whose parameters are optimized in accordance with the intended use, and can operate up to a lower frequency band of the coincidence frequency. In general, a new panel type speaker device is driven by a driver unit in the vicinity of the center point of the diaphragm in order to secure a bending mode with the maximum density from the diaphragm. The diaphragm has been demonstrated by mathematical modeling tools with a specific aspect ratio that gives uniform mode density by finite element analysis. In addition, the novel panel type speaker device requires a supply position of the driving force with respect to the diaphragm that realizes the best mode uniformity by Fourier analysis. In the new panel type speaker device, it is possible to drive a diaphragm having a larger area, although some loss occurs in the high frequency band due to the expansion of Fourier analysis. The diaphragm is expressed by a bending rigidity equation that approximates the bending equation of a more general static beam by taking the zero frequency limit of the wave function.

  The new panel type loudspeaker device is a factor that determines the bending behavior of the diaphragm, that is, surface density, bending rigidity, geometric dimensions (outside dimensions), surface area, drive point position, drive unit parameters, core share module It is manufactured by setting the parameters of the internal loss or the support method of the diaphragm optimally. In general speaker devices, the sound behind the so-called dipole exhibits a phase opposite to that of the front sound, so a large baffle plate or enclosure that prevents cancellation of acoustic energy in the middle to low frequency bands is required. To do. On the other hand, in the new panel type speaker device, the radiation of the rear sound called bipolar is added to the front sound, so that the efficiency is improved and the baffle plate and the enclosure are unnecessary.

  The novel panel type speaker device enables full range output reproduction by a single diaphragm driven by a single element transducer. The new panel type speaker device can obtain a flat frequency characteristic equivalent to that of a conventional speaker device by selecting an appropriate material of the diaphragm and adopting a configuration suitable for the transducer.

  The new panel type speaker device is not only compatible with existing amplifiers by making the sensitivity and electric load equivalent to those of the conventional speaker device, but also of electrodynamic type driver unit and piezoelectric type driver unit. Application is possible, and a very wide sound field radiation pattern as well as a bi-directional radiation pattern are obtained. The new panel-type speaker device has almost 100% conversion efficiency from mechanical energy to acoustic energy, and possesses non-directional radiation characteristics independent of frequency, that is, large uniformity of sound power for each frequency. ing. The new panel type speaker device has a feature that the attenuation of the sound power due to the distance condition is small, and has various other features due to its novel configuration.

  The present invention is based on a novel panel-type speaker device based on a bending wave theory in which a driver unit described above drives a diaphragm based on a reproduction input signal to drive a diaphragm to perform output reproduction. To provide a device equipped with a speaker that can reproduce a reproduction input signal such as audio information with sufficient volume and good sound quality equivalent to or better than that of a conventional external speaker device by configuring the lid as a diaphragm. It was proposed for the purpose.

  In order to achieve the above-described object, a device having a speaker according to the present invention has a rigidity that is housed in a box-shaped cover, and a panel-shaped diaphragm in which a partial bending operation occurs, and the panel-shaped diaphragm. And a speaker having a plurality of driver units that cause a partial bending operation to the panel-shaped diaphragm based on a reproduction input signal, and the panel-shaped diaphragm has an outer peripheral portion that is the box-shaped cover. The inner wall of the peripheral side plate is arranged in an opening surrounded by the peripheral side plate of the box-shaped cover in a non-constrained state with a predetermined interval, and is driven by the driver unit to emit reproduced sound. A mass component material is provided on the outer periphery of the panel-shaped diaphragm.

  Further, an apparatus having a speaker according to the present invention includes a box-shaped cover that is attached to a main body so as to be freely opened and closed, a panel-shaped diaphragm that is housed in the box-shaped cover, has rigidity, and generates a partial bending action. A speaker that is attached to the panel diaphragm and includes a plurality of driver units that cause a partial bending operation to the panel diaphragm based on a reproduction input signal. The outer peripheral portion is disposed at an opening surrounded by the peripheral side plate of the box-shaped cover in an unconstrained state with a predetermined interval from the inner peripheral wall of the peripheral side plate of the box-shaped cover, and is attached to the driver unit. Driven to emit reproduced sound, and a mass component material is provided on the outer periphery of the panel-shaped diaphragm.

  In the device according to the present invention, the peripheral side plate of the box-shaped cover member is arranged at a predetermined interval on the outer peripheral portion of the panel-shaped diaphragm, and the panel-shaped diaphragm is accommodated in the cover member. The constrained panel-shaped diaphragm is protected by the peripheral side plate of the box-shaped cover member, and damage due to collision with a foreign object or the like can be prevented.

It is the perspective view of the use condition which applied the panel type speaker apparatus shown as the 1st Embodiment of this invention to the built-in speaker apparatus of an electronic notebook apparatus. It is a principal part longitudinal cross-sectional view of the lid structure which comprises a panel type speaker apparatus. It is a figure explaining the state of the vibration mode of the diaphragm comprised with the cover body in a panel type speaker apparatus. It is a principal part block diagram of the panel type speaker apparatus which drives the diaphragm shown as the 2nd Embodiment of this invention with three driver units. It is a principal part block diagram of the other panel type speaker apparatus which drives the diaphragm shown as the 3rd Embodiment of this invention with three driver units. It is a principal part block diagram of the other panel type speaker apparatus which drives the diaphragm shown as the 4th Embodiment of this invention by three driver units. It is a principal part block diagram of the other panel type speaker apparatus which drives the diaphragm shown as the 5th Embodiment of this invention with three driver units. It is a principal part block diagram of the panel type speaker apparatus which drives the diaphragm shown as the 6th Embodiment of this invention with five driver units. It is a principal part block diagram of the other panel type speaker apparatus which drives the diaphragm shown as the 7th Embodiment of this invention with five driver units.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A panel type speaker device 1 shown in FIG. 1 as an embodiment of the present invention constitutes, for example, a built-in speaker device of an electronic notebook device 2 and is housed in a lid structure 4 that is rotatably combined with the device body 3. The As shown in FIG. 1, the electronic notebook device 2 is provided with a liquid crystal display 5 and an operation unit 6 on the main surface of the device body 3 having a thin box shape, and is provided on one side surface of the device body 3. A pair of hinge mechanisms 7a and 7b whose details are omitted (in the following description, a plurality of members and parts are first described in this way, but in the following description, the hinge mechanisms are not specifically described separately) 7), the lid structure 4 is rotatably supported.

  As shown in FIG. 2, the lid structure 4 includes a cover member 8 formed in a shallow dish shape, an intermediate plate 9 combined with an unillustrated attachment portion formed integrally with the cover member 8, and the intermediate plate. 9 includes an inner lid member 10 (hereinafter referred to as a diaphragm) that is supported as described later and constitutes the diaphragm of the panel type speaker device 1. The lid structure 4 closes the apparatus body 3 to protect the liquid crystal display 5 and the operation unit 6 when the electronic notebook apparatus 2 is not used. The lid structure 4 is provided with a lock mechanism (not shown) at a portion facing the hinge mechanism 7 so that the apparatus main body 3 is closed. The lid structure 4 is not limited to the above-described configuration. For example, the lid structure 4 is further thinned by omitting the middle plate 9 that supports the diaphragm 10 and directly supporting it by the cover member 8.

  The panel type speaker device 1 includes the above-described diaphragm 10 and driver units 11a, 11b, and 11c attached to the diaphragm 10. The panel type speaker device 1 is connected to a control unit or the like on the device main body 3 side and has wiring for supplying a reproduction input signal to each driver unit 11, but this wiring is not shown but is inside the hinge mechanism 7. Is guided as appropriate.

  The diaphragm 10 is formed, for example, in a panel shape from a synthetic resin material. The entire surface of the diaphragm 10 is configured as a sound emitting surface 10a as will be described later, and a driver unit 11 is attached to the rear surface to be driven. The driving surface 10b is configured. As the synthetic resin material of the diaphragm 10, for example, acrylic resin, polycarbonate resin, polyester resin, cellulose resin such as triacetyl cellulose and diacetyl cellulose, styrene resin, or the like is used. The vibration plate 10 may be formed of not only a synthetic resin material but also a thin metal plate material in which the driven surface 10b is subjected to non-conductive treatment.

  Unlike the diaphragm of a conventional general speaker device, the diaphragm 10 has sufficient rigidity having a thickness of about 2 mm, for example. The outer dimension of the diaphragm 10 is slightly smaller than the opening dimension of the cover member 8, and the outer peripheral portion 10 c is supported by the middle plate 9 in an unconstrained state by the cover member 8 and the like. As will be described in detail later, the diaphragm 10 is driven by causing a partial bending operation by the driver unit 11 based on a reproduction input signal, and emits a reproduction output. As described above, since the outer peripheral portion 10c is supported in an unconstrained state as described above, the outer peripheral portion 10c is configured to freely vibrate.

  As shown in FIG. 1, the driver unit 11 that is spaced apart at equal intervals in the longitudinal direction is fixed to the driven surface 10 b of the diaphragm 10. As each driver unit 11, a voice coil type driver unit provided in a conventional speaker device or a piezoelectric type driver unit using a piezoelectric element is used. The piezoelectric driver unit is effective because it is thin and small as a whole because it is composed of thin piezoelectric elements, although details are omitted. The panel type speaker device 1 includes the unit 11 for the three dry units, but may be configured to include one unit or many units.

  FIG. 2 shows the voice coil type driver unit 11. The driver unit 11 includes a voice coil 12 and a magnetic circuit 13 that drives the voice coil 12 based on a reproduction input signal. The voice coil 12 is composed of a bobbin 14 and a coil part 15 that is configured by applying a winding to the outer periphery of the bobbin 14. The magnetic circuit 13 is combined with the center pole 16, the ring-shaped magnet 17 combined by passing the center pole 16 through the center hole, and the magnet 17 in a stacked state with the center pole 16 facing the center hole. It is comprised by members, such as the ring-shaped plate 18 and the damper 19. FIG. The driver unit 11 is supported by a damper 19 so that the voice coil 12 is positioned in a magnetic space portion constituted by the center pole 16 and the plate 18 with the coil portion 15. The damper 19 connects the bobbin 14 of the voice coil 12 and the plate 18.

  As shown in FIG. 2, the driver unit 11 configured as described above has the tip portion of the bobbin 14 joined and fixed to the driven surface 10b of the diaphragm 10, and the center pole 16 stops the flange portion 16a. By being screwed to the middle plate 9 via screws 16b, the lid body structure 4 is accommodated. For example, the driver unit 11 may be configured such that a ring-shaped attachment plate is fitted to the tip of the bobbin 14 and attached to the diaphragm 10 via the attachment plate.

  In the panel type speaker device 1 configured as described above, when a reproduction input signal (audio current) is supplied to the driver unit 11 from a reproduction input signal input circuit unit (not shown), the diaphragm 10 is vibrated and The reproduction output sound is emitted from the sound emitting surface 10a. When an audio current is supplied to the voice coil 12 positioned in the magnetic space of the magnetic circuit 13, the driver unit 11 vibrates in the direction orthogonal to the diaphragm 10. In the panel type speaker device 1, a partial bending operation is generated in the diaphragm 10 with the joint portion of the voice coil 12 and the bobbin 14 as a driving point, and a sound is reproduced and reproduced.

  FIG. 3 is a diagram showing an operation state of the diaphragm 10 driven by the driver unit 11 in the panel type speaker device 1 described above. FIG. 4A is a diagram showing an operation state of the diaphragm 10 when a reproduction input signal having an input frequency of 62 Hz is supplied. FIG. 5B is a diagram showing an operating state of the diaphragm 10 when a reproduction input signal having an input frequency of 150 Hz is supplied. Further, FIG. 3C is a diagram showing an operating state of the diaphragm 10 when a reproduction input signal having an input frequency of 501 Hz is supplied. As is clear from these drawings, the diaphragm 10 is bent when a reproduction input signal is applied from the driver unit 11 to generate a complicated vibration mode. In addition, the diaphragm 10 is bent with a larger peak as the frequency of the reproduction input signal increases.

  As described above, the panel type loudspeaker apparatus 1 is driven into the limited space of the lid structure 2 by directly driving the diaphragm 10 constituting the lid body that opens and closes the apparatus main body 3 without using a resonance box, an acoustic tube, or the like. A new speaker system is constructed. Further, the panel type speaker device 1 eliminates the need for a support member such as an arrowhead or a frame for supporting the outer peripheral portion 10c of the diaphragm 10 constituting the lid, so that the number of parts is reduced and the assembly process is streamlined. Thus, the manufacturing cost is reduced. Furthermore, since the panel type speaker device 1 includes the diaphragm 10 having a large vibration area, it is possible to reproduce and output a larger volume and better sound quality as compared with the conventional built-in speaker device. Furthermore, since the panel type speaker device 1 constitutes a built-in type speaker device of the electronic notebook device 2 by being housed in the lid structure 4, it is difficult to connect members and troublesome as in the conventional external speaker device. A connection operation is not required and a large installation place is not occupied.

  By the way, in the panel type speaker device 1, as described above, the driver unit 5 is bonded and fixed to the driven surface 10 b of the diaphragm 10 via the tip end portion of the bobbin 14. Part. Therefore, the panel type speaker device 1 has a feature that it is difficult to transmit a large vibration to the outside of the joint portion when an input frequency in a high frequency band is applied. In the panel type speaker device 1, much of the sound pressure energy radiated with respect to the input frequency in the high frequency band is emitted not from the entire diaphragm 10 but from its joint.

  In order to extend the effective band in the high frequency band, the panel type speaker device 1 has a driver unit 11 and a bobbin 14 or a mounting plate (not shown) attached to the diaphragm 10 via an elliptical ring-shaped or rectangular joint. You may comprise so that it may attach. In the panel type speaker device 1, the characteristics in the high frequency band are changed by the joint structure of the diaphragm 10 and the driver unit 11. The panel type speaker device 1 can thereby adjust the frequency band and the amplitude in which resonance occurs in the high frequency band, and the frequency response characteristic in the high frequency band can be obtained by combining with the characteristics in the low frequency band and the middle frequency band. It is possible to take more widely.

  In order to improve the frequency response characteristics in the high frequency band, the panel type speaker device 1 is mounted with, for example, all or part of the driven surface 10b of the diaphragm 10 to which the driver unit 11 is bonded and fixed being made of different materials. You may make it comprise with a board. For example, when the diaphragm 10 is molded, the mounting plate is integrated by an insert molding method, and a material that improves the response characteristics with respect to a specific input frequency is selected. Therefore, the panel type speaker device 1 has a function equivalent to a so-called two-way speaker device mechanically in order to make the vibration characteristics different between the diaphragm 10 and the mounting plate.

  By the way, since the panel type speaker device 1 includes the three driver units 11, independent bending operations are generated in the diaphragm 10 by the driver units 11. Therefore, in the panel type speaker device 1, each driver unit 11 does not drive the node position in each frequency band unless the node position of each driver unit 11 is intentionally set as the vibration position for the diaphragm 10. In the panel type speaker device 1, each driver unit 11 complements the driving of the diaphragm 10 at the node position in each frequency band, so that the occurrence of sharp peaks and dips in the frequency response characteristics is suppressed. become. In the panel type speaker device 1, the peak and the dip are reduced in the middle frequency band and the high frequency band, and the inherent reproduction output corresponding to the size of the diaphragm 10 and its material characteristics is thinned, so-called sound quality without a habit. Playback output is made.

  The panel-type speaker device 1 may be configured by providing a mass component material that is located in a region where there is no obstacle to the diaphragm 10 and is formed of a material that easily absorbs vibration. The mass component material is made of, for example, a tape-shaped lead material, and is adhered to the diaphragm 10 on the outer peripheral portion 10c of the sound emitting surface 10a over the entire circumference. As described above, the panel type loudspeaker device 1 is stable in the low frequency band so that vibration is easily generated in the outer peripheral part 10c even in the low frequency band by making the outer peripheral part 10c of the diaphragm 10 unconstrained. The reproduction output can be obtained. The panel type speaker device 1 is provided with a mass component material on the outer peripheral portion 10c so as to reduce the vibration mode generation frequency in the low frequency band, thereby extending the reproduction effective frequency band. Note that the mass component material is not limited to the tape-shaped lead material described above, and may be formed of other materials having a large vibration loss or a material having a large vibration-proof drop.

  By the way, in the panel type speaker device 1 described above, by providing a larger number of driver units 11 and driving the diaphragm 10, it becomes possible to keep the area of the vibration region of the diaphragm 10 larger. . Therefore, the panel type speaker device 1 is improved in sensitivity in a low frequency band, and a lower operating frequency is secured because the diaphragm 10 operates in a phase opposite to the joint portion of the driver unit 11 in the vibration region. The

  The panel type speaker device 20 shown in FIG. 4 as the second embodiment of the present invention is characterized by the configuration of the input unit 21 that supplies a reproduction input signal to each driver unit 11 that drives the diaphragm 10. is doing. Since the diaphragm 10 and the driver unit 11 are the same as the diaphragm 10 and the driver unit 11 of the panel type speaker device 1 described above, description thereof is omitted. The panel type speaker device 20 is configured to drive the diaphragm 10 by supplying a reproduction input signal or switching a phase independently to each driver unit 11 via an input unit 21.

  The input unit 21 includes an amplifier 22 that amplifies a reproduction input signal supplied from the control unit or the like of the apparatus main body 3, and changeover switches 23 a to 23 a that are connected independently from each other between the amplifier 22 and each driver unit 11. 23c and a series circuit composed of volumes 24a to 24c. The changeover switch 23 performs, for example, an input on / off switching operation of the reproduction input signal for each driver unit 11 and a phase switching operation of the reproduction input signal in the input on state. Each volume 24 adjusts the level of the reproduction input signal input to each driver unit 11 to adjust the sensitivity of each driver unit 11 individually.

  The panel type speaker device 20 configured as described above is supplied with a reproduction input signal having a required phase component from the input unit 21 via the device body 3. In the panel type speaker device 20, each driver unit 11 is independently operated to drive the diaphragm 10 to emit a reproduction output. Therefore, the panel type speaker device 20 does not require a special circuit element, a switching device or the like, and can obtain a reproduction output in which the sound field, sound quality, and the like are appropriately changed by a very simple operation by the user.

  The panel type speaker device 30 shown in FIG. 5 as the third embodiment of the present invention includes three driver units 11a to 11c for driving the diaphragm 10 in the same manner as the panel type speaker device 20 described above. The configuration of the input unit 31 that supplies a reproduction input signal to each of the driver units 11 is characteristic. That is, the panel-type speaker device system 30 divides the reproduction input signal into three frequency bands at the input unit 31 and performs phase adjustment to synthesize it, and then supplies the vibration plate 10 to each driver unit 11. It is comprised so that it may drive.

  The input unit 31 includes band-pass filters 32a to 32c to which a reproduction input signal is supplied from the apparatus main body 3, change-over switch units 33 to 35 connected to the band-pass filter 32, and the change-over switch units 33 to 35, respectively. Mixers 36a to 36c to which reproduction input signals are respectively supplied, and amplifiers 37a to 37c inserted between the mixers 36 and the driver units 11, respectively. The band pass filter 32 divides the reproduction input signal supplied from the apparatus main body 3 into predetermined frequency bands.

  Each changeover switch unit 33 to 35 is constituted by three changeover switches 33a to 33c, 34a to 34c, and 35a to 35c connected to the mixer 36, respectively. These change-over switches 33a to 33c, 34a to 34c, 35a to 35c perform, for example, an input on / off switching operation of the reproduction input signal for each mixer 36 and a phase switching operation of the reproduction input signal in the input on state. . Each mixer 36 synthesizes a reproduction input signal of a predetermined frequency band supplied from each changeover switch unit 33 to 35 and inputs it to each amplifier 37. Each amplifier 37 amplifies the combined reproduction input signal and supplies it to the driver unit 11.

  By configuring the panel type speaker device 30 as described above, the reproduction input signal supplied from the device body 3 is divided into three frequency bands at the input unit 31 and adjusted to the required phase component. Input. In the panel type speaker device 30, each driver unit 11 is independently operated to drive the diaphragm 10 to emit reproduced sound. In the panel type speaker device 30, for example, the reproduction input signals of the in-phase component are all supplied to each driver unit 11 in the low frequency band, and the reproduction input signals of the reverse phase component are supplied in the middle frequency band and the high frequency band. Constitute. Specifically, in the panel type speaker device 30, in the middle frequency band and the high frequency band, for example, a positive phase component reproduction input signal is input to the upper and lower driver units 11a and 11c, and the central driver unit 11b is also connected. A reproduction input signal having a reverse phase component is input.

  The panel type speaker device 30 causes a large bending operation to be generated by the diaphragm 10 by supplying a reproduction input signal of an in-phase component to each driver unit 11 in a low frequency band. Therefore, in the panel type speaker device 30, as described above, a peak in the low frequency band is generated as in the case where the mass component material is attached to the outer peripheral portion 10c of the diaphragm 10, so that the response characteristics are improved, that is, the sensitivity. Improvement will be achieved. In addition, the panel type speaker device 30 supplies a reproduction input signal having an antiphase component in the middle frequency band and the high frequency band to each driver unit 11, thereby generating a frequency band that cancels each other, thereby reducing the overall sensitivity. Therefore, a reproduction output whose sensitivity is flattened as a whole is output.

  In the panel type speaker device 30, as described above, when a reproduction input signal having a reverse phase component is input to the driver unit 11b in the central portion, a large bending operation occurs in the diaphragm 10, and the characteristic of the material of the diaphragm 10 is unique. Playback sound is output. Accordingly, the panel type speaker device 30 can generate a unique reproduction sound by performing a reverse phase input to the driver unit 11b by the switching operation of the changeover switch units 33 to 35 of the input unit 31 in a specific frequency band. .

  The panel-type speaker device 40 shown in FIG. 6 as the fourth embodiment of the present invention has, for example, three in order to flatten the frequency response characteristics by suppressing the occurrence of the above-mentioned dip portion and excessive peaks. It comprises digital filters 42a to 42c. That is, the panel type speaker device 40 has three driver units 11 a to 11 c that drive the diaphragm 10 as in the above-described panel type speaker device 30, and an input that supplies a reproduction input signal to each of these driver units 11. Part 41. The input unit 41 amplifies the three input filters 42a to 42c that perform appropriate signal processing on the reproduction input signal supplied from the apparatus body 3, and the reproduction input signal that has passed through each of the filters 42, and each driver unit. And amplifiers 43a to 43c that respectively drive the motor 11.

  In the panel type speaker device 40, the reproduction input signal supplied from the device main body 3 separates a specific frequency band that causes the above-described dip portion or excessive peak, for example, by each filter 32 having an inverse response of an impulse response. The signal processing such as the above is performed and supplied to each driver unit 11 via the amplifier 33. The panel type speaker device 40 emits a reproduction output whose reproduction frequency characteristics are flattened. The panel type speaker device 40 can also emit a reproduction output in which only a specific frequency band is emphasized by appropriately selecting each filter 32. Each filter 32 is an appropriate digital filter or analog filter that performs not only a specific frequency band separation process on the reproduction input signal but also an appropriate signal process such as amplitude and phase. .

  The panel type speaker device 40 is configured by applying appropriate delay components to the respective filter coefficients for the respective filters 32 that perform signal processing and supply reproduction input signals to the respective driver units 11 to drive them. You may make it do. The panel type loudspeaker device 40 can be made louder because the sound wave front of the reproduction output emitted from the diaphragm 10 can be controlled by such a configuration and the principal axis can be appropriately shifted from the front.

  Further, in the panel type speaker device 40, an appropriate amplitude component is given to each filter coefficient for each filter 32 that performs predetermined signal processing, supplies a reproduction input signal to each driver unit 11, and drives them. May be configured. By adopting such a configuration, the panel type speaker device 40 can provide directivity in the same manner as the speaker array. Therefore, in the panel type speaker device 40, the sound emitting unit is configured by the single diaphragm 10, but the speaker device 40 can control directivity for a plurality of input sound sources.

  The panel type speaker device 50 shown in FIG. 7 as the fifth embodiment of the present invention is based on the panel type speaker device 40 described above, and includes a filter 52 that obtains a target optimum characteristic in the input unit 51. An example is shown. This panel type speaker device 50 is also composed of three driver units 11 a to 11 c that drive the diaphragm 10, and an input unit 51 that supplies a reproduction input signal to each driver unit 11. The input unit 51 includes a first amplifier 53 to which a reproduction input signal is supplied from the apparatus body 3, a filter 52, and a second amplifier 54 connected to the filter 52.

  In the panel type speaker device 50, the first driver unit 11 a and the third driver unit 11 c arranged above and below are driven by a reproduction input signal supplied via the first amplifier 53 of the input unit 51. Further, the panel type speaker device 50 is supplied with a reproduction input signal that has been subjected to predetermined signal processing by the filter 52 of the input unit 51 via the second amplifier 54, so that the second speaker unit 50 is arranged at the center. The driver unit 11b is driven. The panel type speaker device 50 controls the vibration mode generated in the diaphragm 10 by supplying the reproduction input signal subjected to the predetermined signal processing to the second driver unit 11b as described above.

  The panel-type speaker device 50 drives the second driver unit 11b with different phases with respect to the first driver unit 11a and the third driver unit 11c, for example, by performing reverse phase processing of the reproduction input signal in the filter 52. To do. With this configuration, the panel-type speaker device 50 can drive the diaphragm 10 in a vibration mode that cannot be predicted by ordinary material analysis, and as a result, the above-described dip portion and excessive peaks are suppressed.

  In a panel type speaker device, a reproduction input signal having a phase opposite to each other is supplied to and driven by a driver unit arranged geometrically symmetrically on the diaphragm, so that the material of the diaphragm can be adjusted in a specific frequency band. Regardless, it is possible to forcibly generate vibration nodes at equally spaced positions of these driver units. Therefore, in the panel type speaker device, it is possible to adjust the sensitivity of each frequency band, improve the reproduction frequency characteristics, or adjust the sound field and sound quality by skillfully utilizing such a phenomenon. Of course, the signal processing of the reproduction input signal may be performed by appropriately combining filters for each driver unit.

  A panel type speaker device 60 shown in FIG. 8 as a sixth embodiment of the present invention includes a diaphragm 10, five drive units 11a to 11e, two control units 62a provided in the device body 3, And an input unit 61 that processes the reproduction input signal supplied from 62b and inputs it to each drive unit 11. Of course, the panel type speaker device 60 may be configured such that one diaphragm 10 is driven by three drive units, similarly to the above-described panel type speaker devices.

  The input unit 61 includes first delay component supply circuits 63a1 to 63a4 that sequentially apply large delay components da1, da2, da3, da4 to the reproduction input signal supplied from the first control unit 62a, and a second control. There are provided second delay component supply circuits 63b1 to 63b4 for sequentially applying large delay components db1, db2, db3, db4 to the reproduction input signal supplied from the unit 62b. Further, the input unit 61 is supplied with the first mixer 64a to the fifth mixer 64e and the reproduction input signals mixed in the mixer 64 to drive the driver units 11 respectively. 5 amplifiers 65e.

  The first mixer 64a mixes the reproduction input signal supplied from the first control unit 62a with the reproduction input signal supplied from the second control unit 62b and provided with the delay component db4. The second mixer 64b includes a reproduction input signal supplied from the first control unit 62a and provided with the delay component da1, and a reproduction input signal supplied from the second control unit 62b and provided with the delay component db3. Mix. The third mixer 64c includes a reproduction input signal supplied from the first control unit 62a and provided with the delay component da2, and a reproduction input signal supplied from the second control unit 62b and provided with the delay component db2. Mix. The fourth mixer 64d is a reproduction input signal supplied from the first control unit 62a and provided with the delay component da3, and a reproduction input signal supplied from the second control unit 62b and provided with the delay component db1. Mix. Further, the fifth mixer 64e mixes the reproduction input signal supplied from the first control unit 62a with the delay component da4 and the reproduction input signal supplied from the second control unit 62b.

  In the panel type speaker device 60, the reproduction input signals respectively supplied from the first control unit 62a and the second control unit 62b are subjected to signal processing with different delay component weights and supplied to each driver unit 11. Is done. Therefore, the panel type speaker device 60 is gradually driven from the first driver unit 11a toward the fifth driver unit 11e according to the delay component d based on the reproduction input signal of the first control unit 62a. Is called. In the panel type speaker device 60, the driving is gradually performed toward the fifth driver unit 11e and the first driver unit 11a according to the delay component d based on the reproduction input signal of the second control unit 62b. Is called.

  In the panel type speaker device 60, the reproduction output based on the reproduction input signal of the first control unit 62a is emitted from the sound emission surface 10a of the diaphragm 10 in the direction indicated by the arrow AA in FIG. . In the panel type speaker device 60, the reproduction output based on the reproduction input signal of the second control unit 62b is emitted from the sound emitting surface 10a of the diaphragm 10 in the direction shown in FIG. Therefore, in the panel type speaker device 60, different directivities are given to the two-channel sound sources.

  The panel type speaker device 70 shown in FIG. 9 as the seventh embodiment of the present invention drives the diaphragm 10 by five drive units 11a to 11e and has two control units 62a provided in the device main body 3. The configuration for supplying the playback input signal from 62b is the same as that of the panel type speaker device 60 described above, but the configuration of the input unit 71 that processes the playback input signals supplied from the two control units 62 is characteristic. ing. Of course, the panel type speaker device 70 may also be configured such that the diaphragm 10 is driven by three drive units in the same manner as each panel type speaker device described above.

  That is, the input unit 71 includes five first filters 72a1 to 72a5 that perform signal processing on the reproduction input signal supplied from the first control unit 62a, and the reproduction input signal supplied from the second control unit 62b. Are provided with ten filters 72 including five second filters 72b1 to 72b5. In addition, the input unit 71 includes five mixers 73a to 73e that mix the reproduction input signal supplied from the signal-processed first control unit 62a and the reproduction input signal supplied from the second control unit 62b. And five amplifiers 74a to 74e that drive the respective driver units 11 when the reproduction input signals mixed in the mixer 73 are input.

  The first mixer 73a is supplied from the first control unit 62a and is subjected to signal processing in the first filter 72a1, and is supplied from the second control unit 62b and is subjected to signal processing in the fifth filter 72b5. The reproduced reproduction input signal is input, and these are channel-synthesized and supplied to the first amplifier 74a. The second mixer 73b is a reproduction input signal supplied from the first control unit 62a and subjected to signal processing in the second filter 72a2, and is supplied from the second control unit 62b and processed in the fourth filter 72b4. The reproduced reproduction input signal is input, and these are combined into a channel and supplied to the second amplifier 74b. The third mixer 73c is a reproduction input signal supplied from the first control unit 62a and subjected to signal processing in the third filter 72a3, and is supplied from the second control unit 62b and processed in the third filter 72b3. The reproduced reproduction input signal is input, and these are combined into a channel and supplied to the third amplifier 74c.

  Further, the fourth mixer 73d is supplied from the first control unit 62a and is subjected to signal processing in the fourth filter 72a4, and is supplied from the second control unit 62b to the second filter 72b2. The reproduction input signal subjected to signal processing is input, and these are channel-synthesized and supplied to the fourth amplifier 74d. The fifth mixer 73e is supplied from the first control unit 62a and is subjected to signal processing in the fifth filter 72a5, and is supplied from the second control unit 62b and is supplied from the first filter 72b1. The reproduction input signal subjected to signal processing is input, and these are channel-synthesized and supplied to the fifth amplifier 74e.

  For each of the filters 72a and 72b, as with the filter 42 used in the panel-type speaker device 40 described above, for example, a predetermined frequency band is selected and an arbitrary phase is selected for a reproduction input signal input to each of the filters 72a and 72b. Alternatively, a filter having a filter coefficient for performing amplitude signal processing is used. The panel type speaker device 70 can obtain more effective directional characteristics than the panel type speaker device 60 described above by using the optimum filters 72a and 72b.

  Further, the panel type speaker device 70 may be configured to control a specific frequency band for the reproduction input signal supplied to each driver unit 11 that drives the diaphragm 10 by each filter 72a, 72b. Thus, the panel type speaker device 70 can generate a vibration mode having a large number of antinodes and nodes in the diaphragm 10, and can consider each antinode region of the vibration mode as a sound source. In speaker arrays, it is generally necessary to increase the number of sound sources in order to obtain the effect of narrowing the directivity to a high frequency band, which increases the cost, increases the size of the device, and gives users a sense of pressure. There is. As described above, the panel-type speaker device 70 can obtain the desired narrow directivity with a small number of driver units 11 and has only one sound emitting surface, so that the panel-type speaker device 70 is small and inexpensively configured. Solve the problem. Needless to say, the improvement in narrow directivity in the panel type speaker device 70 can also be achieved by each of the panel type speaker devices described above.

  Furthermore, the panel type speaker device 70 may be configured to change the directivity by providing a control unit that controls the filter coefficients of the filters 72a and 72b to be updated with time, for example. By adopting such a configuration, the panel type speaker device 70 can generate a special acoustic effect such as rotation and movement of the sound output axis without using a special mechanical configuration. Of course, such a configuration can also be employed in each of the panel type speaker devices described above.

  In the present invention, the individual techniques described in the above-described embodiments may be appropriately combined, and the diaphragm may be driven by switching these electrically or mechanically. Moreover, although each embodiment mentioned above showed what integrated the panel type speaker apparatus in the cover structure 4 of the electronic notebook apparatus 2, this invention is not limited to this electronic notebook apparatus 2 of course. It is.

DESCRIPTION OF SYMBOLS 1 Panel type speaker apparatus, 2 Electronic notebook apparatus (casing apparatus), 3 apparatus main body, 4 cover structure, 5 liquid crystal display, 6 operation part, 7 hinge mechanism, 8 cover member, 10 diaphragm (inner cover member), 10a Sound emitting surface, 10b Driven surface, 10c Outer peripheral part, 11 Driver unit

Claims (2)

A panel-shaped diaphragm that is housed in a box-shaped cover, has rigidity, and causes a partial bending motion;
A speaker having a plurality of driver units attached to the panel-like diaphragm and causing a partial bending operation to the panel-like diaphragm based on a reproduction input signal;
The panel-shaped diaphragm is arranged in an opening surrounded by the peripheral plate of the box-shaped cover in an unconstrained state with an outer peripheral portion spaced apart from an inner peripheral wall of the peripheral plate of the box-shaped cover by a predetermined distance. And driven by the driver unit to emit the playback sound,
A device having a speaker in which a mass component material is provided on the outer periphery of the panel-shaped diaphragm. A box-shaped cover attached to the main body so as to be freely opened and closed;
A panel-like diaphragm that is housed in the box-like cover and has rigidity and causes partial bending, and a panel-like diaphragm that is attached to the panel-like diaphragm and is partially attached to the panel-like diaphragm based on a reproduction input signal A speaker having a plurality of driver units that cause a bending operation,
The panel-shaped diaphragm is arranged in an opening surrounded by the peripheral plate of the box-shaped cover in an unconstrained state with an outer peripheral portion spaced apart from an inner peripheral wall of the peripheral plate of the box-shaped cover by a predetermined distance. And driven by the driver unit to emit the playback sound,
A device having a speaker in which a mass component material is provided on the outer periphery of the panel-shaped diaphragm.

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