JPH01288093A - On-vehicle vibrator - Google Patents

Abstract

PURPOSE:To sense acoustic vibration rich in power at a low frequency range in a body at a larger area by forming a hollow part in an elastic member, providing an electroacoustic transducer vibrating the air in the hollow part and forming the front and rear faces of the elastic member to be the same as the front face of a rear cushion. CONSTITUTION:A hollow part 34 is formed in the elastic member 22 and the electroacoustic transducer 30 is provided, which vibrates the air in the hollow part 34. Then the front and rear faces of the elastic member 22 are both formed to be the same shape as the front face of the rear cushion 14 of a car body sheet 10. When an electric signal being a music or the like is inputted to the electroacoustic transducer 30, the electric signal is transduced into the acoustic vibration and the air in the hollow part 34 formed in the elastic member 22 is resonated at a low frequency. The air vibration is propagated to a human body through the front face 24 of the elastic member 22. Thus, a person taking a seat on the car body sheet can sense the powerful music at a low frequency band at the back side entirely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration device that directly transmits acoustic vibrations to a human body, and particularly to one suitable for being mounted on a vehicle.

[Prior Art] A vibration device is disclosed in Japanese Utility Model Application Publication No. 51-123793.

This device is a chair-shaped device in which elastic members are arranged on the seat and backrest, and electro-acoustic transducers such as speakers are connected to the back surfaces of the seat and backrest of the elastic members through diaphragms made of rigid bodies. It is equipped with a container.

A person sits on a seat and leans his or her back against the backrest. When an electrical signal containing music or the like is input to an electroacoustic transducer, this electrical signal is converted into acoustic vibrations. This acoustic vibration is transmitted to the human body via the diaphragm and the elastic member. A person sitting on the seat can experience music etc. not only through his ears but also directly.

[Problems to be Solved by the Invention] The conventional vibration device described above transmits the acoustic vibrations generated by the electroacoustic transducer to the human body via a rigid diaphragm, so it is difficult to reduce the perceptible area of the acoustic vibrations. Increasing the size would require arranging a large number of diaphragms and attaching an electroacoustic transducer to each diaphragm. Additionally, because the diaphragm is difficult to resonate at low frequencies, the bass range lacks impact.

Moreover, this vibration device has a structure in which electroacoustic transducers are attached to the back surfaces of the seat and backrest parts of the elastic member through diaphragms, so that it can obtain bodily vibrations from the seats of vehicles such as cars and trains. This required changes to the vehicle production line and modifications to existing vehicle seats.

The present invention has been made in view of the above points; and is a vibration device that allows the user to experience powerful acoustic vibrations in the low frequency range over a large area using at least one electroacoustic transducer. The object of the present invention is to provide a device that can be easily added to a vehicle seat.

[Means for Solving the Problems] A vehicle-mounted vibration device according to the present invention includes a hollow portion formed in an elastic member and an electroacoustic transducer that vibrates the air within the hollow portion. Moreover, both the front and rear surfaces of the elastic member are formed to have the same shape as the front surface of the backrest portion of the vehicle seat.

When used in a vehicle seat having a headrest, the upper front surface of the elastic member is inclined rearward.

[Function] The vehicle-mounted vibration device according to the present invention can be securely fixed simply by bringing the rear surface of the elastic member into close contact with the front surface of the vehicle seat backrest having the same shape. At this time, the front surface of the elastic member, that is, the surface that contacts the human body, maintains the shape of the front surface of the backrest portion of the vehicle seat, which has been determined ergonomically, for example.

A person sits on the seat of a vehicle seat and leans his or her back against the front of the elastic member. At this time, the entire back comes into contact with the front surface of the vibrating device and is securely held.

In the case of a vehicle seat having a headrest, the front upper part of the resilient member is inclined rearward, and the upper part of the resilient member is thinner than the lower part. Therefore, the headrest can easily support the human head.

When an electrical signal containing music or the like is input to the electroacoustic transducer, this electrical signal is converted into acoustic vibration, and the air in the hollow formed in the elastic member resonates at a low frequency. This air vibration is transmitted to the human body through the front surface of the elastic member. Therefore, a person sitting on a vehicle seat can experience music with a powerful bass range throughout his or her back.

[Embodiment] FIG. 1 is a perspective view showing a partially cut-out vehicle-mounted vibration device according to an embodiment of the present invention, together with a vehicle seat in which this vibration device is suitably used. It is.

The vehicle seat 1O shown in the figure is installed in an automobile, and consists of a substantially horizontal seat portion 12 and a backrest portion 14 extending rearward and obliquely upward from the rear edge of the seat portion 12.

The backrest part 14 is connected to the seat part 12 via a horizontal shaft 15, and its inclination angle can be changed. Backrest part 1
The left and right side portions 16° 1B of No. 4 are slightly bent forward and diagonally to the sides. That is, the front shape of the backrest 14 is ergonomically determined, and the front of the backrest 14 comes into contact with the entire back of the person sitting on the seat 12. Therefore, the human body is reliably held even when the automobile is traveling around a curve. A headrest 18 is provided at the upper edge of the backrest portion 14.

Reference numeral 20 indicates a vehicle-mounted vibration device according to an embodiment of the present invention, which is suitably used in the vehicle seat IO described above.

The elastic member 22 of the vehicle-mounted vibration device 20 is made of, for example, urethane foam. Front and rear surfaces 24.2 of this elastic member 20
6 are both formed to have the same shape as the front surface of the backrest portion 14 of the vehicle seat 10. However, the upper part of the front surface 24 is inclined rearward. Therefore, the upper part of the elastic member 22 is thinner than the lower part.

The elastic member 22 includes a long resonance tube 28 with a circular cross section.
is buried. The tube 28 is a bellows-type tube made of plastic, for example, and is flexible and self-maintains its bent shape. The resonance tube 28 is sequentially bent into a U-shape within the elastic member 22 and is disposed throughout the interior of the elastic member 22 . A speaker 30, which is an electroacoustic transducer, is attached to one end of the resonance tube 28. The speaker 30 has a lead wire 32 for inputting an electrical signal containing music or the like. This speaker 30 vibrates an air column within a hollow portion 34 formed inside the resonance tube 28. However, the other end of the resonance tube 28 is open. The cross-sectional shape of the resonance tube 28 is arbitrary. For example, by making this cross-sectional shape flat, the entire elastic member 22 can be made thinner.

Vehicle-mounted vibration device 2 according to the embodiment of the present invention described above
0 can be manufactured as follows. That is, first, a mold of the front shape of the backrest portion 14 of the vehicle seat 10 is taken. For example, a mold can be obtained by pasting a softened plastic film along the front surface of the backrest portion 14 and cooling and hardening it. Make at least two copies of this mold. Then, one mold is fixed at an angle with respect to the other, and the resonance tube 28 and speaker 30 are arranged between the two, and then urethane is injected between both molds and foamed. Fill the space between the molds with urethane foam.

The above-described on-vehicle vibration device 20 is manufactured by the above operations.

The vehicle-mounted vibration device 20 is securely fixed simply by bringing the rear surface 2B of the elastic member 22 into close contact with the front surface of the backrest portion 14 of the vehicle seat IO having the same shape. Person is vehicle seat lO
The patient sits on the seat 12 of the patient and leans his or her back against the front surface 24 of the elastic member 22. At this time, the entire back comes into contact with the front surface 24 of the elastic member 22, that is, the front surface of the vibrating device 20, and is held securely. Moreover, the upper part of the front surface 24 of the elastic member 22 is inclined backward, and the upper part of the elastic member 22 is thinner than the lower part. Therefore, the head can be easily supported by the headrest 18. Incidentally, if the backrest portion 14 of the vehicle seat 10 is raised around the horizontal axis 15 by an angle equal to the inclination angle of the front surface 24 with respect to the rear surface 2B of the elastic member 22, the inclination angle of the front surface 24 of the elastic member 22 can be changed to the original backrest portion 14. can be matched to the inclination angle of

When an electrical signal is input to the speaker 30 through the lead wire 32, this electrical signal is converted into acoustic vibration. This acoustic vibration propagates in the longitudinal direction within the hollow portion 34 while being reflected by the inner wall surface of the resonance tube 28, and resonance occurs in the air column within the hollow portion 34. As a result, resonance tube 2
Vibration occurs on the wall surface of the elastic member 8, and the vibration of the wall surface is transmitted through the front surface 24 of the elastic member 22 to the human body comfortably held thereon.

A portion of the sound waves is also radiated through the opening at one end of the resonance tube 28 and reaches the ear. Therefore, a person sitting on the vehicle seat 10 can directly experience the music while listening to it.

Moreover, since the air column, which is a resonator, is long, sounds in the low frequency range resonate well, so you can enjoy music with powerful deep bass. Also, a tubular hollow part 3 for resonance
4 is bent in a U-shape throughout the inside of the elastic member 22, so the acoustic vibration sensing area is large.

Although not shown in the drawings, the outer layer of the elastic member 22 may be made of a low-density urethane foam, and the tubular hollow portion may be formed by an inner high-density layer.

Further, the hollow portion formed by the high-density layer may be a large cavity. In this case, the hollow portion surrounded by the high-density layer may be filled with a three-dimensional continuous porous material such as Scotto foam. Scotto foam is a type of urethane foam that not only has extremely good air permeability but also is highly elastic. Therefore, even if the elastic member 22 is compressed by the human body, the hollow portion can be prevented from being blocked without disturbing the resonance of the air within the hollow portion. The filling material in the hollow portion is not limited to Scott foam, but may be a three-dimensional continuous porous body made of other materials. Also, in addition to or in place of the Scott foam, a spiral spring may be used.
The same effect can be obtained.

[Effects of the Invention] As explained above, the in-vehicle vibration device according to the present invention is provided with a hollow part formed in an elastic member and an electroacoustic transducer that vibrates the air inside the hollow part. Therefore, the degree of freedom in arranging the hollow part is large. Therefore, it is possible to efficiently experience acoustic vibrations using at least one electroacoustic transducer. Furthermore, when the number of electroacoustic transducers is at least, the acoustic vibration sensing area can be increased. Moreover, since it utilizes air resonance, it has a powerful bass range and can transmit heavy bass tones in music with high efficiency. Therefore, the dimensions of the electroacoustic transducer may be small.

Furthermore, since both the front and rear surfaces of the elastic member are made to have the same shape as the front surface of the backrest portion of the vehicle seat, the in-vehicle vibration device according to the present invention can be securely fixed simply by bringing the rear surface of the elastic member into close contact with the front surface of the vehicle seat backrest portion. At the same time, the entire back of the person sitting on the vehicle seat can be securely held in front.

Further, in the case of a vehicle seat having a headrest, since the front upper part of the elastic member is inclined rearward, the headrest can easily support the human head.

From the above, according to the present invention, there is provided an in-vehicle vibration device that allows the user to experience powerful acoustic vibrations in the low frequency range over a large area using at least one electro-acoustic transducer, and moreover, it can be applied to a vehicle seat. can be easily added.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a partially cutaway vehicle-mounted vibration device according to an embodiment of the present invention, together with a vehicle seat in which this vibration device is suitably used. Description of symbols 10...Vehicle seat, 12...Seat portion, 14...Backrest portion, 18...Headrest, 20...Vehicle-mounted vibration device, 22...Elastic member, 24... Front surface of elastic member, -26... Rear surface of elastic member, 28... Resonance tube, 30... Speaker, 34... Hollow part. Patent applicant: Toyo Rubber Industries, Ltd.

Claims (2)

[Claims] 1. A vibration device having a hollow part formed in an elastic member and provided with an electroacoustic transducer that vibrates the air in the hollow part, wherein both the front and rear surfaces of the elastic member have the same shape as the front surface of the backrest of the vehicle seat. An in-vehicle vibration device featuring: 2. 2. The vehicle-mounted vibration device according to claim 1, wherein the vibration device is used for a vehicle seat having a headrest, and wherein an upper front surface of the elastic member is inclined rearward.