JPH0132456Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sensory acoustic device that can be attached to and detached from the backrest of a driver's seat or a passenger's seat in a vehicle such as an automobile.

In general, in automobiles, the low frequency range is masked by road noise, engine noise, vibrations, etc., so the low frequency sound and sense of realism tend to be lacking. To compensate for this, there are graphic equalizers, super woofers, etc., but under the special conditions of the interior of a car, it is impossible to avoid a dull, muffled sound, and when the volume is increased. Passengers, especially passengers in the rear seats, feel noisy, and the driver also has difficulty hearing external sounds, making driving dangerous.

In view of this, in recent years, seats in which a sensory acoustic device is incorporated into the seat body have been developed. This inputs the low frequency signal of the music signal and vibrates the seat itself. This vibration is transmitted directly to the listener's body without using the air as a medium, so the sound waves transmitted from the ears and this vibration wave are mixed in the listener's body, creating a powerful heavy sound that can be felt throughout the listener's body. You can get bass and a sense of presence.

However, conventional sensory acoustic devices of this type are sold by being built into the seat body by the manufacturer, and cannot be installed at will after the purchase of a vehicle or in an existing vehicle.

Therefore, in recent years, some sensory acoustic devices have been sold as units, but since these devices are built into and fixed to the backrest or seat of the seat body, installation requires the removal of the seat cover or the seat body itself. The installation work has to be done by removing it from the car, which makes the installation work difficult, and there have been problems such as owners being unable to install it even if they purchase it.

The present invention has been made in view of the above points, and its purpose is to provide a sensory acoustic device that can be easily and quickly attached to the seat body, and can also be removed once attached. It is something.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

First, Fig. 1 shows the transducer 2 of the basic planar drive unit 1, and A indicates a container-shaped frame with a flange on the outer periphery.
A ₁ and a stepped portion A ₂ is formed on the inner wall of the outer peripheral wall.

A magnetic circuit B is arranged in the space of the frame A, and the magnetic circuit B is supported by the stepped portion _A2 of the frame A via a damper C around the magnetic circuit B. The magnetic circuit B is formed by having an annular magnet _B3 attached to a yoke _B2 having a center pole _B1 , and a top plate _B4 fixed to the magnet _B3 .

A voice coil D is wound around a bobbin D1 in an air gap of the magnetic circuit B, and _one end of the bobbin _D1 is fixed to a holder plate E. The holder plate E is disposed to cover the opening of the frame A, and its peripheral edge is fixed to the step _A2 of the frame A together with the outer peripheral edge of the damper C by an adhesive F.

Braking material G is loaded in the space between the center pole _B1 and the holder plate E, and the part surrounded by the bobbin _D1 . This braking material G is made of a rubber material, a sponge material such as polyurethane foam, a viscous material, or a felt material.

Furthermore, the braking material G is also loaded into the space between the frame A and the yoke B ₂ and applies braking to the magnetic circuit B itself. The space surrounded by C and C is an air chamber H, and this air chamber H is opened to the atmosphere through a ventilation hole _A3 made in the frame A. And the frame A
The flange _A1 is attached to the vibration transmission member described later.

Therefore, when a low-frequency audio signal is applied to the voice coil D, the frame A and the magnetic circuit B are displaced relative to each other due to the magnetic interference between the magnetic force generated in the voice coil D and the magnetic force between the magnetic gaps. Vibration occurs. This vibration is transmitted from the frame A to the vibration transmission member, and further transmitted from the vibration transmission member to the listener via the seat body.

Next, an electric circuit for driving the transducer 2 having the above structure will be explained with reference to FIGS. 2 and 3a.

In FIG. 2, a is a stereo playback device, b is a left and right channel speaker driven by the output from the stereo playback device a, and c is a mixer for mixing the left and right output signals from the stereo playback device a;
d is a volume that adjusts the level of the output signal from the mixer c; e is a low-pass filter that cuts out high-frequency signals in the output signal from the volume d and passes only low-frequency signals; f is for deep bass reproduction. This is an output amplifier.

In this circuit, the left and right output signals from the stereo playback device a are mixed by the mixer c, and their levels are adjusted by the volume d.
Only the deep bass signal is outputted by the low-pass filter e and amplified by the output amplifier f, and the drive unit 1 is driven by the output thereof.

On the other hand, the circuit of FIG. 3a has a level compression circuit g and a first
A low-pass filter h is connected. In this circuit, the reproduced signal from the mixer c is controlled to an appropriate level by the level compression circuit g, thereby preventing damage caused by the high output of the transducer 2. The characteristics of the amount of vibration and the physical sensation form a curve as shown in figure b, and as the amount of vibration increases, it becomes felt rapidly in the body, so by using a compression circuit to create the curve characteristics shown in The first low-pass filter h cuts high-frequency components, and the second low-pass filter e further eliminates unnecessary high-frequency components. Since this circuit is the same as the above-mentioned circuit except that the circuit is cut, a description of its operation will be omitted.

Next, a device for attaching the planar drive unit 1 equipped with the transducer 2 driven by the above-mentioned circuit to the backrest 3 of the main body of an automobile chair is shown in FIGS. 4a to 4c. I will explain.

First, the planar drive unit 1 will be explained with reference to FIG. 4d.
A rectangular frame 5 is provided in the frame 5, and the above-mentioned transducer 2 is attached to the frame 5 via a support arm 6. Vibrations of the transducer 2 are transmitted via the support arm 6 and the frame 5. The vibration is transmitted to the transmission member 4, thereby causing the entire vibration transmission member 4 to vibrate. Note that reference numeral 7 in the figure is a cover, and a vibration isolating material 8 is interposed between it and the support arm 6, so that almost no vibration of the transducer 2 is transmitted to the cover 7.

The sensory acoustic device 9 of the present invention having the planar drive unit 1 is mounted using the legs 13, 13 of the headrest 12 which are fitted into the mounting pipe 11 of the pipe frame 10 formed on the backrest 3.

The sensory acoustic device 9 includes a substantially L-shaped elastic support member 14 formed along the back surface from the top surface of the backrest portion 3.
The planar drive unit 1 is provided at the lower end of the vertical portion 14a along the back surface of the drive unit 1, and the horizontal portion 14b along the upper surface
Pipe-shaped fixing members 15, 15 into which the legs 6, 6 are fitted are provided at both ends of the pipe.

When the vertical portion 14a of the elastic support member 14 is in a free state, the vertical portion 14a of the elastic support member 14 is inward (on the right side of the drawing) as shown in FIG.
When attached to the backrest part 3, the backrest part 3
, and becomes almost vertical as shown by the two-dot chain line in the same figure. This vertical portion 14a and the cover 7 are integrally formed.

In addition, 16 in the figure is a protective cover provided on the elastic support member 14.

When attaching the sensory acoustic device 9 to the backrest 3, first remove the headrest 12 from the backrest 3, and then attach the vertical portion 14a of the elastic support member 14 and the planar drive unit 1 to the back of the backrest 3. The horizontal portion 14b is placed at a predetermined position on the upper surface while pressing the horizontal portion 14b. Then, while maintaining this state, the headrest 12
The headrest 12 is attached to the backrest part 3 again by fitting the legs 13, 13 into the fixing members 15, 15 and the mounting pipes 11, 11. As a result, the vibration transmission member 4 side of the planar drive unit 1 bites into the back of the backrest 3, and the reaction force from the back causes the fixing member to
A part of the inner circumferential surface of the legs 13, 15 is in pressure contact with the outer circumferential surface of the legs 13, 13, and the sensory acoustic device 9 is in a state where there is no play.
is attached to the backrest part 3. Note that when replacing or removing the sensory acoustic device 9, the legs 13, 13 of the headrest 12 are connected to the mounting pipe 1.
1, 11, and the fixing members 15, 15.

When the planar drive unit 1 is driven, the vibration transmission member 4 vibrates, and this vibration is transmitted from the back surface of the backrest 3 to the entire backrest 3, thereby causing the pipe frame 10 and the pipe frame 10 to vibrate. An S-shaped spring (not shown) stretched between the left and right legs and the cushion material 3a vibrate. This transmits the low tones in the music to the listener's back.

Figures 5a and 5b show a second embodiment of the invention. In this embodiment, the leg 1 of the headrest 12 is
A fixing member 16 detachably attached to the horizontal part 14b extends along the upper surface of the backrest part 3 from both lengthwise ends of the horizontal part 14b, and is bent downward at approximately right angles at both ends of the upper surface. arm part 17,
17, the arm portions 17, 17 and the horizontal portion 14b
A pair of engagement plates 18, 1 slidably attached to the
8, and a spring member 19 stretched between the engagement plates 18, 18.

Semi-cylindrical engagement pieces 20, 20 are erected approximately at the center of the engagement plates 18, 18, and the engagement pieces 20, 20 are moved by the spring force of the spring member 19 to the legs 13, 20 of the headrest 12. 13. Further, slits 18a, 18a extending in the sliding direction are formed on one end side of the engagement plates 18, 18, and headed screws 21, 21 are connected to the arm portions 17, 17 from the slits 18a, 18a. Hole 17a, 1
7a, the engagement plates 18, 18 are fixed onto the horizontal portion 14b and the arm portions 17, 17.

Note that the downwardly bent portions of the arm portions 17, 17 (portions located on both sides of the backrest portion 3) are
A control section 22 of the planar drive unit 1 and an audio device 23 such as a tape recorder are attached as necessary.

When attaching to the backrest 3, first screw in the headed screw 2.
1 and 21 to free the engagement plates 18 and 18, and then loosen the vertical portion 14 of the elastic support member 14.
a and the planar drive unit 1 are pressed against the back surface of the backrest 3, and the horizontal portion 14b and the arm portions 17, 17 are placed at predetermined positions on the upper surface (at this time, the engaging plate 18,
18 are separated from each other). Then, while maintaining this state, the engaging pieces 20, 20 are engaged with the legs 13, 13 of the headrest 12 by the spring force of the spring member 19, and the headed screws 21, 21 are tightened to close the engaging plates 18, 18. Horizontal part 14b, arm part 1
Fix it at 7,17. Thereby, the sensory acoustic device 9 is attached to the backrest portion 2 without any play. When replacing or removing the sensory acoustic device 9, loosen the headed screws 21, 21 to free the engagement plates 18, 18, and then remove the engagement pieces 20, 20 from the legs 13, 13. Bye.

In this embodiment, there is no need to pull out the headrest 12 each time the sensory acoustic device 9 is attached or removed.

As explained above, according to the present invention, the fixing member is detachably attached to the leg of the headrest;
It is equipped with a planar drive unit and consists of an elastic support member supported by the fixing member so that the vibration transmission member is closely pressed against the back of the backrest by spring force, so there is no need to modify the chair during installation. It can be easily attached and removed by the user, and it can be attached to any type of chair without being limited to a specific type of chair.

In addition, the cushioning properties of the chair itself, seating comfort, etc.
There is no risk of impairing the basic functions of the chair itself.

Furthermore, since the vibration transmission member of the planar drive unit uses the spring force of the elastic support member to tightly press against the back of the backrest, the vibration transmission efficiency is high, and the entire backrest vibrates instead of localized vibrations. As a result, the user can experience soft deep bass, and there is no significant difference in the perceived acoustic effect depending on the sitting position, and the perceived acoustic effect is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a drive unit used in a sensory acoustic device according to the present invention, FIGS. 2 and 3a are block diagrams showing an example of a circuit for driving the same drive unit, and FIG. Figure b is a graph showing the relationship between physical sensation and the amount of vibration, Figure 4 a is a partially cutaway side view showing an embodiment of the present invention, Figure b is a rear view, and Figure c is before it is attached to the backrest. A side view showing the state of
Figure 5d is a side sectional view of the planar drive unit, Figure 5a is
1 is a partially omitted plan view showing a second embodiment of the present invention, and FIG. 1B is a rear view of the same. DESCRIPTION OF SYMBOLS 1... Planar drive unit, 2... Transducer, 4... Vibration transmission member, 14... Elastic support member, 15, 16... Fixing member.

Claims (1)

[Scope of utility model registration request] A planar surface consisting of a fixing member that is detachably attached to the legs of a headrest installed on the back of the chair body, a transducer driven by an acoustic electrical signal, and a vibration transmitting member to which the transducer is attached. A sensory acoustic device comprising: a drive unit; and an elastic support member equipped with the planar drive unit and supported by the fixing member so as to tightly press the vibration transmission member against the back surface of the backrest.