JP4418415B2 - Sound generator system for vehicles - Google Patents

Description

  The present invention relates to a vehicle sounding body system, and more particularly to a vehicle sounding body system using a sounding actuator.

  The vehicle is provided with an audio deck or the like for enjoying radio programs and music, and a system using voice or the like such as voice guidance in a navigation system is installed. In addition, voice guidance for notifying the vehicle back, left turn, right turn, etc. is also performed outside the vehicle using a sounding body such as a speaker.

  In order to output such voice guidance, generally a sounding body such as a speaker using a voice coil actuator is used. In the sounding body using the voice coil actuator, one end of the vibration paper is attached to the housing via an appropriate cushioning material, and the other end is driven by the voice coil, thereby converting the movement of the vibration paper into air vibration. The principle is used. When it is necessary to output voice guidance at a high output, the movement amount of the voice coil is increased. This large amount of movement requires a large amount of power. On the other hand, since the sound is distorted, it is said that there is a limit to the high output of the sound in the voice coil type speaker using the vibration paper that supports one end with a buffer material. .

  As a sound generator using a diaphragm having one end fixed, for example, an MBL-101 type speaker developed by MBL Akstic Gelde AG of Germany and appeared in the Japanese market around 1992 is known. This MBL-101 type speaker uses a spheroid diaphragm made of a magnesium aluminum thin plate, one end of this diaphragm is fixed, and the other end is driven by a voice coil. The swell and shrinkage caused by the deflection are supported by folds along the axial direction of the carbon fiber. As a result, it is evaluated that a high-output sound having a three-dimensional effect similar to that of a concert hall in a living room at home is directed to 360 degrees in all directions and covers from 20 Hz to 40,000 Hz. However, this MBL-101 type speaker has a size of 45 cm × 50 cm × 170 cm, a weight of 80 kg, and a large size.

  In vehicles, there is a great demand for notifying the state of vehicles by warning sounds or voice guidance. For example, in addition to notifying passers-by etc. of the above-mentioned vehicle back, left turn, right turn, etc., the vehicle user is informed that the entrance / exit doors, trunk doors, bonnet doors, etc. are not sufficiently closed, or the vehicle is kept keyed There is a demand for notifying the driver that he is leaving. Since these call attention, high output warning sounds and voice guidance are preferable. However, the conventional technique using a voice coil type speaker that uses a vibrating paper that supports one end with a cushioning material as it is, has a limit in increasing the output of warning sound and sound. An MBL-101 type speaker using a diaphragm having one fixed end is too large to be mounted on a vehicle.

  An object of the present invention is to provide a vehicle sound generator system that enables high output of sound under a new concept.

A sound generator system for a vehicle according to the present invention is connected to a vehicle control section and selects and outputs a sound signal corresponding to the state of the vehicle, and converts the output sound signal into a sound generator drive signal. Drive circuit to be supplied to the sounding actuator and sounding actuator attached to the outer shell metal plate that constitutes the outer shell of the vehicle, and is movable with respect to the housing part and the housing part fixed to the outer shell metal plate An output movable element whose front end portion is pressed against the outer metal plate by the biasing means, and the output movable element is moved and driven with respect to the housing in accordance with the sound generator driving signal. The strength of the pressing force that presses the sounding actuator against the outer shell metal plate by the mechanism that adjusts the pressing force of the urging means and the mechanism that adjusts the pressing force of the biasing means or the mechanism that adjusts the distance between the casing and the outer metal plate Push to adjust Characterized in that it comprises a force adjusting means.

  The audio signal output unit preferably includes a storage unit that stores a plurality of audio signals representing the state of the vehicle, and a selection unit that selects a predetermined audio signal according to the vehicle state from the storage unit. .

  In the vehicle audio system according to the present invention, the outer shell metal plate to which the sound generation actuator is attached is at least one of the outer shell metal plate of the entrance door, the outer shell metal plate of the bonnet door, or the outer shell metal plate of the trunk door. It is preferable that

  Further, the sounding actuator is disposed so as to surround the movable element portion so as to be movable in the axial direction, and a movable element portion in which the magnetostrictive elements in which the bias magnetic field magnets are disposed at both ends in the axial direction are arranged along the axial direction. A drive coil that supplies an AC magnetic field signal in the axial direction to the movable element portion by the sound generator drive signal, an output mover that is disposed at the distal end portion of the movable element portion and is attached to the outer shell metal plate of the vehicle, A casing portion that supports the end portion on the bottom surface side and guides the output mover to be movable in the axial direction on the top surface side, and biasing the movable element portion to the bottom surface side of the housing portion via the output mover. It is preferable that the outer shell metal plate is vibrated as a sounding vibrator by relative movement of the movable element portion with respect to the housing portion.

  In a sound generator system that uses a vehicle outer shell metal plate as a sounding vibrator and is driven by a magnetostrictive element actuator, a higher output sound can be produced by strongly pressing the magnetostrictive element actuator against the sounding vibrator. . Therefore, it is preferable to provide a mechanism for adjusting the strength of the pressing force pressed against the sounding actuator on the outer shell metal plate. One is to provide a mechanism for adjusting the pressing force of the biasing means built in the magnetostrictive element actuator. For this, when the biasing means is a spring, a bias means may be provided to adjust the initial deflection amount of the spring. The other is to provide means for adjusting the distance between the case and the outer shell metal plate when fixing the case to the outer shell metal plate, thereby adjusting the reaction force of the biasing means inside the case. May be.

  Also, in a sounding body system that uses the outer shell metal plate of a vehicle as a sounding vibrator and is driven by a magnetostrictive element actuator, the movement of the outer end of the outer shell metal plate is constrained and becomes a fixed end. Higher output sound can be output. Further, when the outer shell metal plate has a curved surface, it works equivalently to the fact that the outer shell metal plate receives a force from the outer end portion and bends, so that a high output sound can be output. Therefore, it is desirable to attach the magnetostrictive element actuator to the outer shell metal plate having a larger curvature among the plural types of outer shell metal plates of the vehicle.

  The attachment position of the magnetostrictive element actuator on the outer shell metal plate having a curvature is preferably provided at a position where the outer shell metal plate hits a vibration node when the outer shell metal plate is considered as one diaphragm. For example, in the case of a simple arc-curved outer shell metal plate, it is preferable to attach a magnetostrictive element actuator to the center or outer periphery thereof.

  With the above configuration, a sounding actuator is attached to the outer shell metal plate that constitutes the outer shell of the vehicle, and a sound signal corresponding to the state of the vehicle selected under the control of the vehicle control unit is converted into a sounding body drive signal to generate sound Supply to the actuator. In this configuration, the outer metal plate functions as a sounding vibration body, and vibrates by receiving the drive of the sounding actuator according to the sound signal. In other words, it is possible to increase the sound output under the new concept of making sound by shaking the outer shell metal plate of the vehicle.

  In addition, a plurality of audio signals expressing the vehicle state are stored, and a predetermined audio signal corresponding to the vehicle state is selected from among them. Can output by vibration.

  Further, the sounding actuator is at least one of the outer shell metal plate of the door for getting on and off, the outer shell metal plate of the bonnet door, or the outer shell metal plate of the trunk door. The corresponding sound can be output.

  Here, since a so-called magnetostrictive element actuator using a magnetostrictive element is used as the sound generation actuator, the outer metal plate can be vibrated as a sound generation vibrator by relative movement of the movable element portion in the axial direction with respect to the housing portion.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Hereinafter, a sedan type passenger car will be described as a vehicle to which the vehicle sound generator system is applied. However, a wagon car, a truck, a bus, and other general vehicles may be used. Further, as the outer shell metal plate of the vehicle to which the sounding actuator is attached, the outer shell metal plate of the door for getting on and off, the bonnet door, and the trunk door will be described, but the outer shell metal plate constituting the other vehicle body may be used. . For example, a sounding actuator may be attached to the outer shell metal plate of the vehicle ceiling. In addition, a configuration in which a plurality of magnetostrictive elements are arranged in the axial direction as a sounding actuator will be described. However, this is an example for explanation, and a magnetostrictive element actuator having other configurations may be used. Further, a sounding actuator based on a principle other than expansion and contraction of the magnetostrictive element may be used as long as it is attached to the outer shell metal plate of the vehicle and drives the sounding vibration plate according to the vehicle state. For example, a so-called voice coil type actuator using movement of a voice coil may be used.

  FIG. 1 is a diagram showing a state of a vehicle 10 to which the vehicle sound generator system 100 is applied. FIG. 1A is a side view of the vehicle 10 and shows a position where the sound generation actuator 20 is attached. (B) is a plan view of the vehicle 10, and is a partially broken view to show the vehicle sound generator system 100. The vehicle 10 shown here is a sedan type having four entrance doors 12, a bonnet door 14, and a trunk door 16, and the sound generation actuator 20 is located near the side of the opening / closing handle of each entrance door 12. 14 and approximately the center of the trunk door 16, respectively. Here, “substantially central portion” refers to the substantially central portion of the planar shape of the bonnet door 14 and the trunk door 16. This substantially central portion corresponds to the position of the in-plane vibration node when the bonnet door 14 and the trunk door 16 are viewed as one diaphragm. The sounding actuator 20 is attached on the vehicle interior side of an outer shell metal plate which is a thin metal plate constituting the vehicle outside of the entrance door 12, the bonnet door 14 and the trunk door 16. That is, the sounding actuator 20 does not appear on the exterior of the vehicle 10. The outer shell metal plate is, for example, a steel plate of about 1 mm, depending on the type of vehicle.

  FIG. 2 is a diagram showing a configuration of the vehicle sound generator system 100. The vehicle sound generator system 100 selects a vehicle state determination module 104 included in the vehicle control unit 102, an audio deck 106 provided in a vehicle room and capable of providing a radio program and music, and an audio signal corresponding to the state of the vehicle 10. The actuator circuit unit 110 that outputs the sound and the sound generation actuator 20 attached to the outer metal plate 18 of the vehicle 10 are configured.

  The vehicle state determination module 104 of the vehicle control unit 102 is connected to vehicle state detection means such as various sensors of the vehicle (not shown), grasps the state of each element of the vehicle, determines the state, and generates the sounding actuator 20. And has a function of determining whether to output a warning sound or voice guidance by shaking the outer metal plate 18. The vehicle state determined by the vehicle state determination module 104 includes retreat of the vehicle, left turn and right turn, opening / closing of a door for getting on / off, a bonnet door, a trunk door, and the like.

  The actuator circuit unit 110 is a circuit having a function of selecting a sound generation signal corresponding to the state of the vehicle 10 under the control of the vehicle control unit 102, amplifying it, and supplying it to the sound generation actuator 20. The sound signal selection function is performed by the sound signal output unit 112, and the amplification function is performed by the amplification drive circuit 120. The actuator circuit unit 110 is supplied with DC power of 12V or 24V from the audio deck through the power line 108 depending on the type of vehicle.

  The pronunciation signal output unit 112 includes a selection circuit 114 and a voice guidance memory 116. The voice guidance memory 116 is a storage device that stores a plurality of voice signals expressing the state of the vehicle, and can be configured by, for example, a suitable semiconductor memory. The voice signal expressing the state of the vehicle is a voice signal that is the content of voice guidance for calling attention. The voice guidance memory 116 stores the contents of the voice signal as digital data, and converts the digital signal into an analog signal when outputting the digital data. Alternatively, an audio signal may be directly recorded as analog data and output directly as an analog signal.

  For example, “Please note that you are back now”, “Turn left”, “Turn right”, “Brake and stop”, “Door” Is not securely closed "," The bonnet is not securely closed "," The trunk is not securely closed "," The seat belt is not securely fastened "," The light remains on ", etc. You can remember it. These audio signals can be identified by coding.

  The selection circuit 114 has a function of searching the voice guidance memory 116 in accordance with an instruction from the vehicle state determination module 104 and extracting and selecting a predetermined voice signal from a plurality of stored voice signals.

  Further, the selection circuit 114 can select the output audio signal of the audio deck 106 instead of selecting a predetermined audio signal from the audio guidance memory 116. In this case, the outer shell metal plate 18 is used as a sound generation vibration plate, which is driven by the sound generation actuator 20, and the three-dimensional sound can be output to the outside using the vehicle 10 as a sound generator. For example, when an important situation occurs in the vehicle state and it is desired to draw a great deal of attention, high output music or the like may be better than voice guidance. This selection is performed under the control of the vehicle state determination module 104. In addition to such an emergency state, when it is desired to enjoy high-powered music outdoors as entertainment, the vehicle 10 itself can be used as a high-powered sounding body rather than the audio deck 106. These selections can be made using, for example, a high output selection switch not shown.

  The amplification drive circuit 120 has a function of amplifying the audio signal selected and output by the selection circuit 114 and converting it into a drive signal for the magnetostrictive element actuator which is the sounding actuator 20. Note that by providing a terminal for adjusting the amplification factor, the volume of the output audio can be made variable.

  The output terminal of the amplification drive circuit 120 is connected to each sounding actuator 20 via the signal line 42. The signal line 42 is provided separately for each of the sounding actuators 20 provided in the vehicle 10. Which signal line 44 is supplied with the output of the amplification drive circuit 120 is determined by a distribution circuit (not shown). The distribution circuit operates under the vehicle control unit 102. For example, in the case of an instruction to send an audio signal “Door is not firmly closed”, the output of the amplification drive circuit 120 is supplied only to the sounding actuator 20 attached to the corresponding entrance door 12. In addition, as described above, in the case of a high output instruction in the case of drawing a great deal of attention, the output of the amplification drive circuit 120 is supplied to all the sounding actuators 20.

  The sounding actuator 20 includes a housing part 30 containing a magnetostrictive element and a drive coil provided around the magnetostrictive element, and an output movable element 36 that moves relative to the housing part 30 in accordance with expansion and contraction of the magnetostrictive element. Composed. The sound generation actuator 20 is attached to the outer shell metal plate 18 by pressing the tip of the output movable element 36 against the outer shell metal plate 18 and fixing the casing 30 to the outer shell metal plate 18 with the attachment plate 22. Is called. Note that the housing 30 is not necessarily fixed to the outer metal plate 18, but the housing 30 may be fixed to another fixed portion. As a result, the relative movement of the output movable element 36 with respect to the casing 30 is transmitted to the outer shell metal plate 18, and the outer shell metal plate 18 can be vibrated as a sounding diaphragm.

  The sounding actuator 20 is a magnetostrictive element actuator that gives a magnetic field signal in the axial direction of the magnetostrictive element, expands and contracts the magnetostrictive element, and moves the mover. FIG. 3 is a cross-sectional view of the sounding actuator 20.

  The sounding actuator 20 includes a housing 30 that includes a cylindrical case 31, a bottom plate 32 that covers the bottom of the case 31, and a lid 34 that is disposed on the top of the case 31. Inside the housing portion 30, the magnetostrictive movable element 50, an element cover 60 that guides the magnetostrictive movable element 50, a drive coil 40 disposed around the magnetostrictive movable element 50, and a vibration receiving plate 72 disposed at the tip of the magnetostrictive movable element 50. And a movable rod 74 are arranged. The movable rod 74 is supported by the lid 34 so as to be movable in the axial direction, and the head 35 is attached to the tip thereof. Here, the head 35, the movable rod 74, and the vibration receiving plate 72 constitute the output movable element 36, and the expansion and contraction in the axial direction of the magnetostrictive movable element 50 is transmitted to the outside.

  The case 31 is a cylindrical member made of a metal material such as aluminum or stainless steel. The outer shape is about 30 mm, the thickness of the tube portion is about 1 mm, the bottom surface opens to the entire surface, and the upper surface is a vibration receiving plate at the center portion. 72 has an opening hole through which the lower shaft portion passes.

  The bottom plate 32 is a disk-shaped member that covers the bottom opening of the case 31 and is preferably made of a magnetic material. When the material of the case 31 is a magnetic material, the same material as the case 31 can be used.

  The lid 34 is a member disposed on the upper surface of the case 31 and has a recess on the bottom surface side, a lid body provided with a through hole in the center of the upper surface, and a bearing fixedly attached to the through hole of the lid body. Consists of The indentation on the bottom side of the lid main body accommodates the coil spring 76 in the indentation space. When the lid 34 is assembled to the case 31, the coil spring 76 is contracted between the vibration receiving plate 72, and the energizing force is applied to the coil spring 76. It has the function to generate.

  The drive coil 40 is obtained by winding a coil winding around a bobbin made of a suitable heat resistant resin. The bobbin has a shaft hole penetrating in the axial direction at the center. This shaft hole is for inserting the magnetostrictive movable element 50 and the element cover 60 arranged around the element. The total number of turns of the drive coil 40 is 600 turns, its axial height is about 14 mm, and the coil winding is a copper wire coated with a heat-resistant insulating resin so that a drive current can flow about 3 App. Etc. are preferably used. Two terminals of the drive coil 40 are pulled out from the housing unit 30 to become a signal line 44, and are connected to the actuator circuit unit 110.

  The magnetostrictive movable element 50 corresponds to a movable element portion that expands and contracts in the axial direction in accordance with the strength of the applied magnetic field in the magnetostrictive element actuator. Here, the magnetostrictive movable element 50 is not composed of one elongate magnetostrictive element, but uses three magnetostrictive elements having a diameter of 3 mm and a length of 5 mm in which neodymium magnets as bias magnets for bias magnetic fields are arranged at both ends. Magnet-magnetostrictive element-neodymium magnet-magnetostrictive element-neodymium magnet-magnetostrictive element-neodymium magnet are arranged in the axial direction to form one movable element. The total displacement amount of these three magnetostrictive elements is the displacement amount of the entire magnetostrictive movable element 50.

As the magnetostrictive element, model PMT-1 manufactured by TDK, composition is Tb _X Dy _1-X Fe _Y (X = 0.34, Y = 1.9), relative permeability 6, “axial elongation-magnetic field The "strength of" characteristic is non-linear with hysteresis, but uses a magnetic field strength of 1000 ppm at 80,000 A / m (1000 oersted). Other types PMS-1 and PMH-1 manufactured by TDK have a relative magnetic permeability of 6 to 10 and substantially the same “axial elongation rate—magnetic field strength” characteristic, although the operating temperature range is different from that of PMT-1. These can also be used. Moreover, as long as it has the same “axial direction elongation rate—magnetic field strength” characteristic, a material other than those manufactured by TDK may be used.

  The strength of the nominal bias magnetic field of the neodymium magnet can be determined in accordance with the maximum value of the drive current passed through the drive coil 40. For example, when the maximum value of the AC magnetic field signal generated by the drive coil 40 is a magnetic field strength of 50,000 A / m or more and 100,000 A / m or less, it is desirable that the nominal bias magnetic field strength is comparable. .

  The element cover 60 is a cylindrical member, and is an elongated cylindrical case that guides the magnetostrictive movable element 50 so as to be movable in the axial direction in the center through portion. This guide is not guided by contact or sliding, but is usually non-contact, and is a guide that prevents the magnetostrictive element and neodymium magnet constituting the magnetostrictive movable element 50 from deviating greatly in the radial direction. .

  When the magnetostrictive movable element 50 is driven by an AC magnetic field corresponding to an audio signal generated by the drive coil 40 to generate an expansion / contraction force in the axial direction, the vibration receiving plate 72 is in balance with the urging force of the coil spring 76. It has a function of transmitting force to the movable rod 74 as an axial output corresponding to the audio signal. Therefore, the vibration receiving plate 72 has a diameter substantially close to the outer diameter of the drive coil 40, and a shaft portion that contacts the uppermost neodymium magnet of the magnetostrictive movable element 50 is provided at the center of the lower surface thereof so as to protrude from the upper surface. Is formed as a substantially circular member having an annular recess that receives the biasing force of the coil spring 76.

  The coil spring 76 is an urging unit that is disposed between the upper surface portion of the vibration receiving plate 72 and the bottom surface side depression of the lid 34 and urges the magnetostrictive movable element 50 toward the bottom plate 32 via the vibration receiving plate 72.

  The head 36 is attached to the movable rod 74 by a screw part so as to be exchangeable, and is a member having an umbrella-like shape with a flat top part. The head 36 is an outer shell that is an object to be transmitted in the axial direction of the magnetostrictive movable element 50 according to an audio signal. It has a function of transmitting to a metal plate.

  The damper resins 90 and 92 and the flexible resin 94 remove noise such as vibration due to excessive resonance and rattling, and the heat conductive resin 96 allows the heat generated by the drive coil 40 to escape efficiently. Each is provided.

  The operation of the vehicle sound generator system 100 having such a structure will be described. In the vehicle 10, for example, when the user tries to leave the vehicle without properly closing the driver door 12, the vehicle state is detected by the vehicle state determination module 104 of the vehicle control unit 102 (vehicle (State detection step), it is determined that the user outside the vehicle 10 should be alerted by voice guidance (vehicle state determination step). In the case of this example, the detection of the vehicle state is performed by the output of a sensor that detects the opening / closing of the passenger door 12 or a sensor that detects that the seat belt has been removed.

  When it is determined that the state of the vehicle should alert the user, the vehicle state determination module 104 selects a sound generation signal corresponding to the state of the vehicle to the actuator circuit unit 110, and outputs the corresponding sound generation actuator. 20 is instructed to be supplied (sound generation instruction step). Specifically, in the above example, an instruction is given to supply a sound signal “the door is not closed” to the sounding actuator 20 attached to the door 12 for getting on and off the driver's seat. This instruction can be performed by transmitting the code of the audio signal and the code of the sounding actuator from the vehicle state determination module 104 to the actuator circuit unit 110.

  In the actuator circuit unit 110, the selection circuit 114 searches the voice guidance memory 116 in accordance with the received instruction code (search process). Then, the searched audio signal is specified and selected as an audio signal to be output, and is output to the amplification drive circuit 120 (selection output step).

  The amplification drive circuit 120 amplifies the received audio signal and converts it into a drive signal for the sounding actuator 20 (amplification step). In the above example, the amplified drive signal is an analog drive signal corresponding to the voice signal “Door is not closed properly”. Next, the signal line 44 corresponding to the sound generation actuator 20 instructed by the vehicle state determination module 104 is specified from the plurality of signal lines 42, and the amplified drive signal is distributed and supplied to the specified signal line 44. (Signal line specifying step). In the above example, the signal line 44 connected to the drive coil 40 of the sound generation actuator 20 attached to the passenger door 12 of the driver's seat is specified, and the amplified drive signal is supplied to the signal line 44.

  In the sound generation actuator 20, an amplification drive signal that changes in accordance with the audio signal is supplied to the drive coil 40, and a magnetic field signal in accordance with the audio signal is generated in the axial direction. The magnetostrictive element expands and contracts by this magnetic field signal, and the expansion / contraction force is transmitted to the output movable element 36. Since the output mover 36 of the sounding actuator 20 is pressed against the outer shell metal plate 18 of the vehicle 10 and moves relative to the housing portion 30 fixed to the outer shell metal plate 18, this causes the outer armature 36 to move outward. The shell metal plate 18 is driven to vibrate according to the audio signal. The outer metal plate 18 functions as a sound generation diaphragm by this movement drive, performs vibration according to the sound generation signal, and outputs sound from the entire sound generation diaphragm. In the above example, the entire entrance / exit door 12 on the driver's seat vibrates and outputs a voice saying that the door is not securely closed.

  The size of the entrance / exit door 12 itself is much larger than the size of the vibration paper of a normal voice coil type speaker, and the outer shell metal plate 18 of the entrance / exit door 12 transmits vibration compared to the vibration paper. High efficiency. Therefore, this sound using the outer metal plate 18 itself of the entrance door 12 as a sound diaphragm has a higher output than the output of a general voice coil type speaker using vibration paper, and is effective for the user. Can be aroused. In this way, it is possible to increase the output of sound under the new concept of using the outer shell metal plate of the vehicle as a sounding vibration body and shaking the outer shell metal plate of the vehicle to produce sound.

It is a figure which shows the mode of the vehicle to which the vehicle tone generator system of embodiment which concerns on this invention is applied. It is a figure which shows the structure of the vehicle sounding body system in embodiment which concerns on this invention. It is sectional drawing of the sound generation actuator in embodiment which concerns on this invention.

Explanation of symbols

  10 vehicles, 14 bonnet doors, 16 trunk doors, 18 outer shell metal plates, 20 sounding actuators, 22 mounting plates, 30 housings, 31 cases, 32 bottom plates, 34 lids, 35 heads, 36 output movers, 40 drive coils , 42, 44 signal line, 50 magnetostrictive movable element, 60 element cover, 72 vibration receiving plate, 74 movable rod, 76 coil spring, 90, 92 damper resin, 94 flexible resin, 96 heat conductive resin, 100 sound generation for vehicle Body system, 102 vehicle control unit, 104 vehicle state determination module, 106 audio deck, 108 power line, 110 actuator circuit unit, 112 sound signal output unit, 114 selection circuit, 116 voice guidance memory, 120 amplification drive circuit.

Claims (4)

An audio signal output unit connected to the vehicle control unit for selecting and outputting an audio signal according to the state of the vehicle;
A drive circuit that converts the output audio signal into a sound generator drive signal and supplies the sound generator drive signal;
A sounding actuator attached to an outer shell metal plate that constitutes the outer shell of a vehicle, the casing being fixed to the outer shell metal plate and movable relative to the casing, the tip of which is energized by an urging means A sounding actuator that includes an output mover pressed against the metal plate , drives the output mover relative to the housing according to the sounding body drive signal, and vibrates the outer metal plate as a sounding vibration body ;
A pressing force adjusting means for adjusting the strength of the pressing force for pressing the sounding actuator against the outer shell metal plate by a mechanism for adjusting the pressing force of the biasing means or a mechanism for adjusting the distance between the casing and the outer shell metal plate; ,
Vehicle sounding body system comprising: a. The vehicle sound generator system according to claim 1,
The audio signal output section
Storage means for storing a plurality of audio signals expressing the state of the vehicle;
Selecting means for selecting a predetermined audio signal according to the state of the vehicle from the storage means;
A vehicle sound generator system comprising: The vehicle sound generator system according to claim 1,
An outer shell metal plate to which the sound generation actuator is attached is at least one of an outer shell metal plate of a passenger door, an outer shell metal plate of a bonnet door, or an outer shell metal plate of a trunk door. system. The vehicle sound generator system according to any one of claims 1 to 3,
Pronunciation actuator
A movable element portion that arranges magnetostrictive elements each having a bias magnetic field magnet disposed at both ends in the axial direction along the axial direction;
A drive coil that is disposed so as to be movable in the axial direction, and that supplies an AC magnetic field signal in the axial direction to the movable element by a sounding body drive signal;
An output mover that is disposed at the tip of the movable element part and is attached to the outer shell metal plate of the vehicle,
A housing portion that supports the end portion of the movable element portion on the bottom surface side and guides the output mover on the top surface side so as to be movable in the axial direction;
Biasing means for biasing the movable element portion to the bottom surface side of the housing portion via the output mover;
A vehicle sounding body system, wherein the outer metal plate is vibrated as a sounding vibration body by relative movement of the movable element part with respect to the casing part.

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