JP5201607B2 - Helmet with speaker - Google Patents

Description

  The present invention relates to a helmet with a speaker using sound wave characteristics.

  Workers at the construction site need to work under a loud noise that cannot be transmitted to the other party. For this reason, for example, a helmet equipped with a transceiver and a speaker is used to communicate instructions and communicate (for example, Patent Document 1).

JP-A-5-63626

  However, when the transceiver is used, at least one of the hands is blocked, which may hinder the work. Moreover, in the helmet as shown by patent document 1, on the structure, it will increase in weight and will require manufacturing cost.

  Therefore, in view of the above circumstances, an object of the present invention is to provide a helmet with a speaker that can realize weight reduction and cost reduction.

A helmet with a speaker according to an aspect of the present invention includes a hammock member that is detachably attached to the inside of the helmet main body so that a gap is formed between the helmet main body and the inner surface of the helmet main body, and the inner surface of the helmet main body. A sheet-like speaker having flexibility that can be deformed along the helmet body and housed between the helmet body inner surface and the hammock member, and at least a wireless receiving function for receiving audio information input to the sheet-like speaker. The sheet-like speaker is in close contact with the vibration surface of the piezoelectric element by sandwiching the piezoelectric element from both sides. And a pair of flexible sheets joined to each other and the piezoelectric element connected to one end and the front to the other end. E Bei a conductor audio signal is applied which is supplied from the wireless communication device, and a plurality of locations corresponding to both end portions of the flexible sheet of the sheet-like speakers arranged along said helmet body inner surface, respectively A plurality of clips that are adhesively fixed to the inner surface of the helmet body are provided with the insertion opening of the flexible sheet facing the top of the helmet, and both ends of the flexible sheet are inserted into the insertion openings so that the sheet-like speaker can be attached and detached. It is characterized by supporting .

Thus, a sheet-like speaker in which a piezoelectric element is sandwiched between a pair of flexible sheets emits sound as a speaker even if the piezoelectric element is not directly adhered to the helmet body. With a simple configuration, it can be detachably housed inside the helmet body, and when performing various resistance tests of the helmet, the sheet-like speaker can be easily removed and attached easily. Also, there is always a space between the helmet body inner surface and the impact-absorbing hammock member, and since the sheet-like speaker is attached using this space effectively, the helmet body does not interfere with the existing hammock member. A sheet-like speaker can be provided inside. Furthermore, a plurality of clips that are adhesively fixed to the inner surface of the helmet body are provided, and both ends of the flexible sheet are detachably supported by being inserted into the respective insertion ports. The sheet-like speaker can be attached and detached with respect to the inner surface of the helmet body very easily.

  Further, in the helmet with a speaker, the sheet-like speaker includes first and second common conductors to which the conductive wires of a plurality of piezoelectric elements having a thin plate shape are connected in parallel, and the first and second common conductors. The voice signal supplied from the wireless communication device is applied to the above.

  Thereby, since a plurality of piezoelectric elements are connected in parallel to the first and second common conductors to which the audio signal is applied, increasing the amplification factor of the audio signal can increase the volume without causing distortion. Can be output.

  Note that the wireless communication device and the sheet-like speaker may be wiredly connected via a cable, or the wireless communication device and the sheet-like speaker may be wirelessly connected via wireless communication.

  In the helmet with a speaker (or communication system) of the present invention, the piezoelectric element is directly attached to the helmet and the helmet itself is used as a speaker, or the sheet-like speaker attached with the piezoelectric element sandwiched between sheet materials is attached to the helmet. Miniaturization, thinning, weight reduction, and cost reduction can be realized. In addition, since sound is radiated and propagated as a wave from a helmet instead of air vibration, energy loss and attenuation rate are low, sound quality and propagation characteristics are excellent, and sound can be accurately transmitted even under loud noise. .

The block diagram of the helmet with a speaker which concerns on embodiment of this invention Conceptual diagram of a communication system according to an embodiment of the present invention The block diagram of the helmet with a wire connection type speaker which is an Example of the helmet with a speaker of this invention The top view seen from the bottom in the state which removed the mounting body in the helmet with a wired connection type speaker shown in FIG. The top view of the sheet-like speaker with which the helmet with a wired connection type speaker shown in FIG. 3 was equipped. Configuration explanatory diagram of the sheet-like speaker shown in FIG. Plan view of a helmet with a wired connection speaker according to a modified example

  Hereinafter, a helmet with a speaker and a communication system using the same according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a helmet 20 with a speaker according to an embodiment of the present invention. The helmet 20 with a speaker outputs sound by utilizing sound wave characteristics, and includes a receiving device 12 including the piezoelectric element 1, the helmet 2, and the antenna 11. Here, the receiving device 12 includes, for example, a dry battery, a small dedicated battery, and the like, and operates. The piezoelectric element 1 is electrically connected to the receiving device 12 through a signal line (not shown), and can vibrate due to a so-called reverse piezoelectric effect based on a signal supplied from the receiving device 12.

  The piezoelectric element 1 may be any type such as a single plate type, a laminated type, a Mooney type, a cymbal type, a monomorph type, a unimorph type, a bimorph type, and a multimorph type. Further, the material may be ceramic, or a piezoelectric polymer material PVDF (Polyvinylidene fluoride) film. When the piezoelectric element 1 is formed of the latter film, the helmet 20 with a speaker can be reduced in size and thickness as compared with the former piezoelectric ceramic.

  The helmet 2 of the present embodiment is a sturdy helmet for a construction site, for example, which is molded from a resin such as ABS or polycarbonate. On the inner upper surface, the piezoelectric element 1 is fixed in close contact. The piezoelectric element 1 may be fixed by an adhesive, or may be fixed in a state of being pressed against the upper surface inside the helmet 2 by a support or the like.

  In addition, an antenna 11 and a receiving device 12 are attached to the inner rear side of the helmet 2. The receiving device 12 captures a radio wave having a predetermined frequency received by the antenna 11, demodulates it, and outputs it as an audio signal to the piezoelectric element 1. The receiving apparatus 12 includes an amplifier (not shown) that can amplify and adjust the output of the audio signal. The operator can adjust the volume of the helmet 20 with the speaker to a volume that is easy to hear by this amplifier. Moreover, it is desirable that the antenna 11 and the receiving device 12 are attached to the inside of the helmet 2 as in the present embodiment from the viewpoint of protection from external impacts.

  Next, the sound output by the helmet 20 with a speaker and the communication system 100 using the same will be described.

  FIG. 2 is a diagram illustrating the communication system 100 according to the embodiment of this invention. The communication system 100 according to the present embodiment includes, for example, a plurality of workers who wear a helmet 20 with a speaker and work on a construction site, and an instructioner (sender 30 in FIG. 2) that sends instructions to these workers. Can be used by.

  When the transmission source 30 inputs an instruction to a known voice input device having a transmitter, the instruction is converted into a voice signal, further modulated into a radio wave, and transmitted to each helmet 20 with a speaker.

  The helmet 20 with a speaker receives a signal transmitted wirelessly by the antenna 11 and demodulates it into an audio signal that can be reproduced by the receiving device 12. The processed signal is output to the piezoelectric element 1, and the piezoelectric element 1 acts to vibrate based on the audio signal. However, since the piezoelectric element 1 is fixed in close contact with the helmet 2 as described above, most of the vibration energy is transmitted to the inside of the helmet 2.

  The vibration energy transmitted to the inside of the helmet 2 behaves as a wave within the helmet 2 to cause an intermolecular collision, and is converted into a sound based on a sound signal obtained by vibrating the piezoelectric element 1 and radiated to the outside. The sound radiated here is not propagated by air vibration but is propagated in the air as a wave. Accordingly, the energy loss is low (that is, the sound quality is good with little noise (noise or heat generated by air vibration)) and the attenuation factor is low (that is, the propagation characteristics are excellent).

  Here, when the worker wears the helmet 20 with the speaker, the inside of the helmet 2 is a space sealed by the worker's head. For this reason, the wave of the sound emitted from the helmet 2 reverberates in the space. Therefore, the operator can hear the instruction from the transmission source 30 without being disturbed by ambient noise. Also, unlike earphones and headphones, the ears are not blocked by equipment. For this reason, ambient sounds can be heard and safety is increased.

  In addition, it can also be considered that the sound from the helmet 20 with a speaker propagates in the air as particles from another viewpoint. In the present specification, all the parts expressed as “wave” can be replaced with “particles” when viewed from another viewpoint.

  When the degree of adhesion between the piezoelectric element 1 and the helmet 2 is low, part of the vibration energy is transmitted to the inside of the helmet 2 and the remaining vibration energy vibrates the main body of the piezoelectric element 1. This vibration becomes energy loss, and may cause an increase in noise components and a decrease in volume of the helmet 20 with a speaker. Therefore, the higher the degree of adhesion, the better. Further, when the vibration energy moves between the members, at least a part of the vibration energy is converted into noise or heat due to air vibration or the like. For this reason, when any member is interposed between the piezoelectric element 1 and the helmet 2, vibration energy transmission efficiency is low (that is, energy loss is large) as compared with a state in which the piezoelectric element 1 and the helmet 2 are in close contact with each other. For example, when the piezoelectric element 1 is fixed to the helmet 2 with a support or the like, the entire contact surface can be brought into close contact with the helmet 2, so that energy loss is extremely small. Further, for example, when the piezoelectric element 1 and the helmet 2 are fixed with an adhesive, the adhesive is interposed in a part between them, so that energy loss occurs for the reason described above. Therefore, the former fixing method is more desirable than the latter fixing method.

  Further, as described above, the vibration of the piezoelectric element 1 is transmitted to the helmet 2 through the contact surface, so that the contact surface is not affected by the position of the electrode (in other words, the polarization direction). It can be said that it behaves as one vibration surface. Here, from the viewpoint of eliminating inclusions between the piezoelectric element 1 and the helmet 2, it is preferable to provide both positive and negative electrodes of the piezoelectric element 1 on the surface facing the contact surface.

  In the helmet 20 with a speaker of this embodiment, a piezoelectric element is used as a vibration source instead of a voice coil and a permanent magnet. Therefore, it is possible to realize a reduction in size, thickness, weight, and cost as compared with a conventional helmet with a speaker. In addition, sound is radiated and propagated as a wave from the helmet 2 instead of air vibration. Therefore, energy loss and attenuation rate are low, and sound quality and propagation characteristics are excellent. If the helmet 20 with a speaker having such excellent sound characteristics is used, the operator can accurately hear the instruction from the instructor even under a loud noise such as at the construction site. In addition, since the instructions can be heard without using a hand, the work can be performed without any trouble.

  In addition, this invention is not limited to the said embodiment, A deformation | transformation is possible in various ranges.

  As another embodiment, for example, the piezoelectric element 1 may be attached to the outside of the helmet 2 or embedded in the inside thereof. Moreover, the above-mentioned communication system is not limited to a form using a construction site helmet, but can be constructed using various other things.

  As another embodiment, for example, a helmet 20 with a speaker as in this embodiment may be additionally provided with a microphone and a transmitter. In this case, when the worker wearing the helmet 20 with the speaker utters words, the sound is input to the microphone. Then, the sound is modulated by the transmitter and transmitted to the transmission source 30 and other helmet 20 with a speaker. When communicating between workers, the modulated sound may be transmitted directly to the other helmet 20 with a speaker, or may be transmitted to the other helmet 20 with a speaker via the transmission source 30. When the voice input device is provided for each helmet 20 with a speaker as described above, the operator and the instructor or the operator can communicate with each other.

  Further, as another embodiment, it is possible to set a channel for audio to be transmitted and received. By providing a tuner for setting a channel in the transmission source 30 or the helmet 20 with the speaker, a certain sound can be transmitted only to a specific person in the communication system 100 (note that the channel here is the transmission source 30). And assigned to each helmet 20 with a speaker). Thereby, the person (including the instructor and the worker) on the voice transmitting side can appropriately convey the information only to the person who needs it. As a result, the worker does not hear unnecessary information and can concentrate on the work.

  Next, an embodiment in which the helmet with a speaker according to the present invention is applied to a construction helmet suitable for high / low pressure live line work, electrical work, or civil engineering work will be described.

  FIG. 3 is an overall view of a helmet with a wired connection speaker according to the present embodiment. In the helmet 40 with wired connection type speaker shown in the figure, the cap body 41 is preferably formed of a polycarbonate resin suitable for high / low pressure live line work or electrical work. A collar 42 that protrudes outward at a predetermined angle is formed integrally with the front opening of the cap body 41. For example, the cap body 41 formed of polycarbonate resin can achieve penetration resistance, shock absorption performance and voltage resistance performance according to the standards of the Ministry of Health, Labor and Welfare. However, the material of the cap body 41 is not limited to polycarbonate resin, and other materials can be used as long as the required performance can be realized.

  A shock absorbing hammock member 43 is attached to the inner surface of the cap body 41. The hammock member 43 includes a band-shaped ring portion 44 disposed along the inner periphery of the cap body opening portion, and a plurality of ribs that are stretched in a semicircular shape along the inner surface shape of the cap body 41 at a plurality of locations of the ring portion 44. And a member 45. The cap body 41 has a plurality of attachment holes (not shown) formed in the region where the ring portion 44 of the hammock member 43 is opposed, and the end of the ring portion 44 and the rib member 45 is attached by an attachment button (not shown). The part can be attached to the cap body 41 at the same time. Chin strings 46 and 47 are attached to the left and right sides of the cap body 41. The chin strings 46 and 47 are also attached to the cap body 41 through attachment holes and buttons (not shown) with the same structure as the hammock member 43. That is, the construction helmet is configured so that the wearing body composed of the hammock member 43 and the chin straps 46 and 47 can be attached to the cap body 41 but can be easily attached and detached. In particular, when performing a withstand voltage performance test, it is necessary to remove the wearing body from the cap body. There is also a demand to change only the wearing body. For this reason, general construction helmets have a structure in which the wearing body can be removed from the cap body, and the above-described attachment / detachment structure using the mounting holes and mounting buttons formed in the cap body is an example. It is also possible to adopt.

  The wired connection type speaker-equipped helmet 40 of this embodiment includes a sheet-like speaker 50 on the inner surface of the cap body 41. A gap of, for example, several tens of millimeters is formed between the inner surface of the cap body 41 and the hammock member 43 for absorbing shock. A sheet-like speaker 50 that is sufficiently thinner than the gap is disposed in a space formed between the inner surface of the cap body 41 and the hammock member 43.

  FIG. 4 is a plan view of the cap body 41 viewed from directly below with the dressed bodies (43, 46, 47) removed from the cap body 41. FIG. Four clips 51 to 54 are fixed on the inner surface 48 of the cap body 41 with the insertion port directed toward the top of the helmet so as to form four rectangular vertices. In order not to affect the strength (penetration resistance) of the cap body 41, the clips 51 to 54 are preferably fixed to the inner surface 48 of the cap body 41 with an adhesive or a double-sided tape. The sheet-like speaker 50 is fixed to the inner surface 48 of the cap body 41 by inserting four corners of a rectangular sheet material 61 that forms the outer shape of the sheet-like speaker 50 into the four clips 51 to 54.

  FIG. 5 is a plan view of the sheet-like speaker 50. The sheet-like speaker 50 has a structure in which two flexible sheets 62 and 63 are closely fixed with a first piezoelectric element 64, a second piezoelectric element 65, and a third piezoelectric element 66 each having a thin plate shape interposed therebetween. Have

  The first to third piezoelectric elements 64 to 66 basically have the same configuration. The first piezoelectric element 64 has a two-layer structure of a circular plate-like electrode layer 71-1 and a thin plate-like piezoelectric layer 72-1 formed concentrically on the upper surface of the electrode layer 71-1. It is shown. The present invention is not limited to the two-layer structure. Conductive wires 73-1 and 74-1 are connected to the electrode layer 71-1 and the piezoelectric layer 72-1 in order to apply an audio signal. The second and third piezoelectric elements 65 and 66 are similarly configured and have a two-layer structure of electrode layers 71-2 and 71-3 and piezoelectric layers 72-2 and 72-3, respectively, and lead wires 73-2. , 73-3, 74-2, 74-3 are connected. The thin plate-like first to third piezoelectric elements 64 to 66 are sandwiched from both surfaces by two flexible sheets 62 and 63 and are closely attached and fixed.

  The first to third piezoelectric elements 64 to 66 are arranged in the longitudinal direction of the rectangular sheet material 61, and the first common along the lower side of the first to third piezoelectric elements 64 to 66. A conductor 75 is provided, and a second common conductor 76 is provided along the upper side. Conductive wires 73-1 to 73-3 on the electrode layer side are connected in parallel to the first common conductor 75, and conductive wires 74-1 to 74-3 on the piezoelectric layer side are connected in parallel to the second common conductor 76. Has been. An amplifier, which will be described later, is connected to one end of each of the first common conductor 75 and the second common conductor 76 via conductors 77 and 78. That is, the audio signal amplified and output from the amplifier can be applied to the first to third piezoelectric elements 64 to 66 via the first common conductor 75 and the second common conductor 76.

  Here, the flexible sheets 62 and 63 are made of a material having a hardness that can be easily bent as shown in FIG. Examples of such materials include polyester resins such as PVC (polyvinyl chloride), PP (polypropylene), EVOH (ethylene-vinyl alcohol copolymer), and PET (polyethylene terephthalate), PE (polyethylene), and PS (polystyrene). Etc.

  In the present embodiment, the first to third piezoelectric elements 64 to 66 and the flexible sheet material are brought into close contact with each other without using an adhesive by using a polyester resin that can be thermocompression bonded as one of the thermoplastic resins. I am letting. For example, as shown in FIG. 6, the 1st and 3rd piezoelectric elements 64-66 and the 1st and 2nd common conductor which carried out conducting wire connection between the two flexible sheets 62 and 63 which consist of thermoplastic resins 75, 76 are disposed, and the first to third piezoelectric elements 64 to 66 and the flexible sheet material are pressed with a predetermined pressing force in a state where these are sandwiched between the flexible sheets 62 and 63, In this state, heat is applied from both sides of the flexible sheets 62 and 63. The flexible sheets 62 and 63 softened to some extent by heat are in close contact with the first to third piezoelectric elements 64 to 66 in the region sandwiching the first to third piezoelectric elements 64 to 66, while the first to first piezoelectric elements 64 to 66 are in close contact with each other. In the area other than the piezoelectric elements 64 to 66, the sheet materials are in direct surface contact with each other and are thermocompression bonded. Therefore, the flexible sheets 62 and 63 are joined by thermocompression bonding between the sheet materials, while the first to third piezoelectric elements 64 to 66 are sandwiched and fixed by the flexible sheets 62 and 63.

  It is desirable from the viewpoint of increasing the speaker volume that the sheet material constituting the flexible sheets 62 and 63 has a certain degree of hardness. On the other hand, it is desirable to have elasticity (flexibility) that allows the sheet-like speaker 50 to bend along the inner surface shape of the cap body 41 as shown in FIG. That is, it is desirable to use a material that can secure a sufficient sound volume as a speaker and that can be easily handled as a sheet.

  According to such a sheet-like speaker 50, since the flexible sheets 62 and 63 are in close contact with the entire outer periphery (both sides) of the element without the piezoelectric element being in close contact with other members, a single sound with sufficient sound volume. Output is possible. As a result, it is not necessary to attach the piezoelectric element to the cap body 41 that is desired to function as a speaker with an adhesive or the like, and it is not necessary to attach the piezoelectric element to another object with an adhesive or the like. Become.

  When the sound (noise) around the helmet is large, the output power of the amplifier is increased to increase the speaker volume. However, if the amplifier power is increased too much and exceeds the allowable range of the speaker, a phenomenon that the sound is distorted occurs.

  As in this example, by adopting a configuration in which the first to third piezoelectric elements 64 to 66, which are a plurality of piezoelectric elements, are connected in parallel to the output terminal of the amplifier, the amplifier output is obtained with one piezoelectric element. Compared with the case of receiving, it is possible to receive a larger amplifier output, and it is possible to output a louder sound without distortion.

  Next, a system for supplying an audio signal to the wired connection type speaker-equipped helmet configured as described above will be described.

  As shown in FIG. 3, it is assumed that a helmet wearer carries a transceiver 80 or a mobile phone (including PHS) 81. In the case of the transceiver 80, one cable terminal 82a of the cable 84 is connected to the earphone microphone terminal 82 of the transceiver 80, while the other terminal 86a of the cable 84 is connected to the input / output terminal 86 of the amplifier 85 attached to the chin string 46. Connecting.

  A microphone 87 is provided in the middle of the cable 84. The audio input to the microphone 87 is converted into an audio signal, sent to the transceiver 80 via the cable 84, and wirelessly transmitted from the transceiver 80 to the counterpart transceiver.

  The amplifier 85 has a built-in power supply, and has an amplifying function for amplifying an input audio signal with an adjusted predetermined amplification factor and outputting it. An output terminal of the amplifier 85 is connected to the first and second common conductors 75 and 76 of the sheet-like speaker 50 via an elastic spring-like cable 88. The conducting wires 77 and 78 are accommodated in a spring-like cable 88. That is, the audio signal output from the amplifier 85 is applied to the sheet-like speaker 50.

  In the case of the mobile phone 81 as well, like the transceiver, one cable terminal 83a of the cable 84 is connected to the earphone microphone terminal 83 of the mobile phone 81, and the other terminal 86a of the cable 84 is connected to the input / output terminal 86 of the amplifier 85. Connecting. The voice input from the microphone 87 is converted into a voice signal, sent to the mobile phone 81 via the cable 84, and wirelessly transmitted from the mobile phone 81 to the base station.

  The audio signal received by the transceiver 80 from the counterpart transceiver is sent to the amplifier 85 via the cable 84 and amplified, and the audio signal amplified by the amplifier 85 is sheet-shaped via the spring-like cable 88 (conductors 77 and 78). Applied to the first and second common conductors 75 and 76 of the speaker 50. The first to third piezoelectric elements 64 to 66 connected in parallel to the first and second common conductors 75 and 76 vibrate in accordance with the applied audio signal, and the first to third piezoelectric elements 64. Sound is output by radiating the vibrations as waves from the flexible sheets 62 and 63 in close contact with the upper and lower surfaces of .about.66. The worker wearing the helmet can receive and listen to the sound emitted from the inside of the helmet from the top of the head.

  In the case of the cellular phone 81, the audio signal received from the other party who is talking via the base station is sent to the amplifier 85 via the cable 84 and amplified, and the audio signal amplified by the amplifier 85 is sent to the sheet-like speaker 50. Applied to the first and second common conductors 75 and 76. As a result, the worker wearing the helmet can listen to the call voice received by the mobile phone 81 from the top of the helmet.

  By the way, it is necessary to periodically perform a withstand voltage performance test on a helmet for high / low voltage hot wire work and electrical work. When conducting the withstand voltage performance test, the wearing bodies (43, 46, 47) are removed from the cap body 41 from the helmet 40 with wired connection type speaker. As shown in FIG. 4, the sheet-like speaker 50 appears on the helmet inner surface 48 in a state where the wearing bodies (43, 46, 47) are removed. By removing the wearing bodies (43, 46, 47), there are no obstacles when accessing the sheet-like speaker 50, and the sheet-like speaker 50 can be easily accessed. In this state, the sheet material 61 is easily detached from the clips 51 to 54 by pulling the four corners of the sheet material 61 in the opening direction of the clips 51 to 54. The clips 51 to 54 may be removed, but may be left attached as long as they do not affect the withstand voltage performance of the helmet. Or the structure which integrally forms the engagement part corresponded to the clips 51-54 in the inner surface 48 of the cap body 41 in the range which does not affect the withstand voltage performance of a helmet, and attaches or detaches the sheet | seat material 61 with respect to the said engagement part. It is also good.

  As described above, the plurality of piezoelectric elements (64 to 66) are held in close contact with the flexible sheets 62 and 63 to realize the sheet-like speaker 50 and to be detachably attached to the cap body 41. There is no need to add special processing to the body 41, and it is easier to attach and detach the speaker than in the case where the piezoelectric element is directly fixed to the cap body 41 with an adhesive or a support, and excellent workability can be realized. .

  In the above description, the sheet-like speaker 50 is spanned across the inner surface 48 of the cap body 41 in the left-right direction. However, the installation location of the sheet-like speaker 50 is not limited to such a place, You may arrange | position and may arrange | position behind. It can also be provided at a place other than between the inner surface 48 of the cap body 41 and the hammock member 43.

  FIG. 7 is a bottom view of a helmet with a wired connection speaker according to a modification. This modification is an example in which a sheet-like speaker is provided at a place other than between the inner surface of the cap body and the hammock member. The hammock member 90 includes a rib portion 91 that extends radially from the top in the direction of the opening, a ring portion 92 that is provided along the outer periphery of the cap body opening by connecting each tip of the rib portion 91 that extends radially, and a helmet. And a belt-shaped forehead pad 93 provided in a predetermined region of the ring portion 92 corresponding to the front. The forehead pad 93 is sewn or fixed to the lower end of the ring portion 92 with an adhesive. The forehead pad 93 is folded upward to cover the inner surface of the ring portion 92 (corresponding to the front of the helmet). The sheet-like speaker 50 has the same configuration as described above, and is housed between the forehead pad 93 and the inner surface of the ring portion 92. The forehead pad 93 is folded upward to form a pocket-shaped storage unit, and is inserted into the storage unit 50 and sandwiched between the storage units. Thus, by storing the sheet-like speaker 50 between the forehead pad 93 and the inner surface of the ring portion 92, a special member for attaching the sheet-like speaker 50 to the cap body 41 becomes unnecessary and the hammock member 90 As a result, it is possible to attach and remove as a whole, and the workability is further improved.

  In the above description, the wired connection type speaker-equipped helmet that connects the transceiver 80 or the cellular phone 81 and the sheet-like speaker 50 (the amplifier 85) with the cable 84 has been described. However, the wireless connection type that connects with the wireless communication instead of the cable 84 is described. It can also be adopted.

  For example, a wireless adapter that wirelessly transmits and receives audio signals is connected to the transceiver 80 or the earphone microphone terminals 82 and 83 of the mobile phone 81, while a wireless headset capable of wireless communication with the wireless adapter is connected to the input / output of the amplifier 85. Connect to terminal 86. As a result, the transceiver 80 or the cellular phone 81 and the sheet-like speaker 50 (amplifier 85) can be linked by wireless communication, the cable 84 connecting the helmet and the transceiver 80 or the cellular phone 81 is eliminated, and workability is improved. Further improvement. As a wireless connection device including a wireless adapter and a wireless headset, a device using Bluetooth (registered trademark) as a communication protocol is known. The wireless adapter has a jack corresponding to the earphone microphone terminal 83 of the mobile phone 81, and the wireless headset has a jack corresponding to the input / output terminal 86 of the amplifier 85 and a microphone. Audio data is wirelessly communicated according to the communication protocol between the wireless adapter connected to the earphone microphone terminal 83 of the mobile phone 81 and the wireless headset connected to the input / output terminal 86 of the amplifier 85.

  In the above description, the audio signal is amplified by the amplifier 85 and then applied to the sheet-like speaker 50. However, if a sufficient volume can be obtained, the audio signal is directly applied to the sheet-like speaker 50 without passing through the amplifier 85. You may make it do.

  Further, the number of piezoelectric elements provided in the sheet-like speaker 50 is not limited to three types, and at least one may be provided. The sound volume necessary for the speaker, the amplifier output, and the required sound quality are selected as appropriate.

  Moreover, although the transceiver 80 or the mobile phone 81 having a transmission / reception function is used as a wireless communication device, a wireless communication device having at least a reception function can be used as long as the helmet has only a speaker function.

  Moreover, the helmet 40 with a wired connection type speaker or the helmet with a wireless connection type speaker shown in FIGS. 3 to 7 can be applied to the communication system shown in FIG.

  The helmet with a speaker according to one embodiment of the present invention uses sound wave characteristics, a receiver that receives an audio signal from an external device, and a piezoelectric element that vibrates based on the received signal; Further, a helmet may be provided in which a part thereof is in close contact with the vibration surface of the piezoelectric element and the vibration is radiated to the outside as a wave.

  In addition, the said helmet with a speaker may attach the piezoelectric element inside the helmet.

  In the helmet with a speaker, the piezoelectric element may be formed of a film.

  The communication system according to one embodiment of the present invention may include at least one helmet with a speaker and a transmitter that transmits an audio signal toward the at least one helmet with a speaker.

  The present invention is not limited to the above-described embodiment and modifications thereof, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Piezoelectric element 2 Helmet 11 Antenna 12 Reception circuit 20 Helmet with speaker 30 Originator 40 Helmet with wired connection type speaker 41 Cap body 42 Brim 43 Hammock member 44 Ring part 45 Rib member 46, 47 Jaw string 48 Cap body inner surface 50 Sheet shape Speaker 51-54 Clip 61 Sheet material 62, 63 Flexible sheet 64 First piezoelectric element 65 Second piezoelectric element 66 Third piezoelectric element 71-1, 71-2, 71-3 Electrode layer 72-1, 72-2, 72-3 Piezoelectric layer 75 First common conductor 76 Second common conductor 80 Transceiver 81 Mobile phone 84 Cable 85 Amplifier 87 Microphone 100 Communication system

Claims (4)

The helmet body,
A hammock member detachably attached to the inside of the helmet body so that a gap is formed between the inner surface of the helmet body,
A sheet-like speaker having flexibility that can be deformed along the inner surface of the helmet body, and housed between the inner surface of the helmet body and the hammock member ;
A wireless communication device having at least a wireless reception function for receiving voice information input to the sheet-like speaker, and a helmet with a speaker,
The sheet-like speaker includes at least one thin plate-like piezoelectric element and a pair of flexible sheets that are in contact with each other while sandwiching the piezoelectric element from both sides and in close contact with the vibration surface of the piezoelectric element. , e Bei a conductor audio signal is applied to the piezoelectric element at one end is supplied from the wireless communication device at the other end is connected to,
A plurality of adhesives fixed to the inner surface of the helmet body at a plurality of locations corresponding to both ends of the flexible sheet of the sheet-like speaker arranged along the inner surface of the helmet body with the insertion ports directed toward the top of the helmet. The helmet with a speaker is characterized in that the sheet-like speaker is detachably supported by inserting both ends of the flexible sheet into the respective insertion openings . The sheet-like speaker includes first and second common conductors connected in parallel to each other of a plurality of piezoelectric elements having a thin plate shape, and the wireless communication device is connected to the first and second common conductors. The helmet with a speaker according to claim 1, wherein an audio signal supplied from is applied. The helmet with a speaker according to claim 1 or 2 , wherein the wireless communication device and the sheet-like speaker are wiredly connected via a cable. The helmet with a speaker according to any one of claims 1 to 3 , wherein the wireless communication device and the sheet-like speaker are wirelessly connected via wireless communication.

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