JPH02170795A - Panel type loudspeaker - Google Patents

Abstract

PURPOSE:To execute molding and to improve an electroacoustic transducing efficiency by providing a thin plate part to fit a picture, a photograph, etc., and an electro-vibration transducer to radiate a vibration in one axial direction at the rear surface side of the thin plate part. CONSTITUTION:A thin plate part 3 is fitted to a vibration radiating piece 5 of an electro-vibration transducer 6, it is made into a diaphragm, the picture photograph, etc., are arbitrarily fitted at the front surface side of thew diaphragm, or the peripheral part of the diaphragm is supported by an outer housing 1. Consequently, the vibration in one axial direction generated by the electro- vibration converter 6 can operate the thin plate part 3, whose peripheral part is supported by the outer housing, as the diaphragm. Thus, the panel type loudspeaker can be made thin, and simultaneously, the electro-acoustic transducing efficiency can be increased.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a panel type speaker.

(Prior Art) A panel-type speaker, which functions as a sounding body, is used for panels or frames for displaying film materials such as paintings and photographs. This panel type speaker can be roughly divided into the following two types.

(1) Something with a built-in small speaker.

(2) Piezoelectric polymer film pasted.

It is.

As shown in FIG. 7, the one with a built-in small speaker has a mounting hole 41 for the small speaker in the center of the panel plate 40.
A small speaker 42 is attached to this mounting hole 41, a masking film 43 is attached to the front of the panel board 40, a film surface 44 of an arbitrary painting or photograph is pasted on the upper surface, and the outer periphery is attached to the outer casing 45. It was held in place by Then, electrical signals from a separately installed sound device 9 are transmitted to a small speaker 4.
1 and was configured to generate sound.

In addition, as shown in FIG. 8, a piezoelectric polymer film 47 is pasted on the surface of a panel board 46, and any picture or other image can be placed on the top surface of the piezoelectric polymer film 47. A film surface of a photograph or the like was attached, and its outer periphery was held between outer casings 49. The apparatus was configured to input electrical signals from the audio equipment to the piezoelectric polymer film 47 to generate sound.

(Problems to be Solved by the Invention) However, the above-described conventional panel type speakers each have the following problems.

(For those with 11 built-in small speakers, the small speakers 41 are attached to the panel board 40 to generate sound, etc., so the sound from the small speakers 41 is transmitted to the panel board 40.)
Since the masking film 43 attached to the surface of the masking film 43 and the film surface 44 of paintings, photographs, etc., are blocked, efficiency is poor, and the sound may become distorted and unclear.

In addition, in the case of (2) to which a piezoelectric polymer film is attached, the vibration of the piezoelectric polymer film 47 causes the panel plate 46 itself to vibrate, so the piezoelectric polymer film 47 and the panel plate 46 Due to the synergistic effect, there were problems such as poor electro-acoustic conversion efficiency, narrow reproduction band, and high distortion rate.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to have a function as a panel board for mounting paintings, photographs, etc., to transmit reproduced sound without distortion, and to improve the electro-acoustic conversion efficiency. The purpose is to provide a good panel type speaker.

(Means for Solving the Problems) In order to achieve the above object, the panel type speaker of the present invention includes: (1) a thin flat plate portion to which paintings, photographs, etc. can be arbitrarily attached; An electric-vibration transducer that radiates vibration in one axis direction is provided on the rear side, and (2) a thin elastic body is provided directly or with a thin elastic body interposed on the front and rear end surfaces of the outer peripheral end of the thin flat plate part. The front and rear end surfaces and the outer peripheral end are held between a front outer casing and a rear outer casing, and an electric-vibration converter that radiates vibration in a uniaxial direction is provided on the rear side of the thin flat plate part.

(Function) The panel-type speaker configured as described above has a thin flat plate section attached to the vibration radiation contact piece of the electric-vibration converter to serve as a diaphragm, and a painting, photograph, etc. can be arbitrarily placed on the front side of the diaphragm. Since the diaphragm can be mounted on the diaphragm, or the peripheral part of the diaphragm is supported by the outer casing, the vibration in the l-axis direction generated by the electricity-vibration converter is transmitted through the thin flat plate part whose periphery is supported by the outer casing. It can be operated as a diaphragm.

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

In Figures 1 and 2, 1 is the outer casing, 2 is the film surface of any painting or photograph, 3 is the thin flat plate part, 4 is the mounting screw, 5 is the vibration radiation contact piece, and 6 is the electricity-vibration converter. It is a vessel.

The outer casing 1 is composed of a frame 1a surrounding all sides, and the lower side or one side of the frame 1a is configured to be detachably attached. By removing this removable surface, the entire surface becomes an open opening. A groove portion 1b is provided on the inner side of each side of the frame body 1a over the entire circumference, and a thin flat plate portion 3 is fitted into this groove portion lb.

The thin flat plate part 3 is a flat plate having appropriate elasticity, and has a stepped part 3a in its center that accommodates the head 4a of the mounting screw 4, which is a connecting part. An insertion hole 3b is provided through which the shaft portion 4b of the screw 4 is inserted. A film surface 2 of paintings, photographs, etc. is mounted on the front surface of the side on which the mounting screw 4 is mounted, and the head 4a of the mounting screw 4 is concealed by this mounting.

This thin flat plate part 3 is inserted into the groove part lb of the outer casing l,
By assembling the removed side of the frame 1a, the peripheral portion of the thin flat plate portion 3 is fixed to the outer casing 1, and is configured as a diaphragm. Then, the shaft portion 4b of the mounting screw 4 is electrically connected.
By hinged the vibration radiation contact piece 5 of the vibration converter 6,
Due to the uniaxial vibration of the electric-vibration converter 6, the thin flat plate portion 3 generates sound in response to an electric signal.

In the above configuration, a panel type speaker can be constructed in which the electric-vibration converter 6 is attached to the thin flat plate portion 3 without using the outer casing 1. In this case, by forming the thin flat plate part 3 with a foamed mica diaphragm, for example, the outer casing 1 can be
It is possible to construct a panel type speaker without using the thin plate portion 3, and it is also possible to use a thin plate portion 3 having an arbitrary curvature. As a result, it is possible to construct a panel type speaker that can further emphasize the interior design.

An example of the electro-vibration converter 6 will be explained below with reference to FIG.

The electric-vibration converter 6 is composed of a magnetic circuit section and a vibrating section. The magnetic circuit section includes a yoke 7 having a disk-shaped bottom part 7b having a through hole 7a in the center, a ring-shaped protrusion part 7C erected around the bottom part 7b, and a yoke 7 in the center of the yoke 7. a cylindrical magnet 8 having a through hole 8a larger than the through hole 7a and a diameter smaller than the inner diameter of the protrusion 7c of the yoke 7; The protrusion 7c of the yoke 7 is composed of a ring-shaped pole piece 9.
A predetermined gap 10 is provided between the pole piece 9 and the magnetic circuit portion. This magnetic circuit section is housed and fixed within the frame 11.

The frame 11 has a cylindrical shape with a bottom that accommodates the magnetic circuit section, and a communication hole 11a that communicates with the through holes 7a, 8a, and 9a is provided at the bottom, and a rear suspension described later is provided outside the communication hole 11a. A stepped portion for attaching the printed circuit board 14 and a stepped portion for attaching the printed circuit board 17 are respectively provided. In addition, the upper part of the frame 11 becomes an open opening,
A step part is provided one step below the opening, and the front suspension 13 is attached to this step part.

Each through hole 8a communicates with the through hole 7a of the yoke 7 described above.
, 9a and the center of the communication hole 11a of the frame 11,
The armature 12 is inserted to constitute the vibrating section.

This armature 12 has a substantially T-shaped cross section, and the armature upper part 12a is provided with a middle-mouth-shaped disc part and an outer ring part 12b provided on the outside thereof.
The front suspension mount 13 is attached to the outer peripheral end surface of b, and is supported from the frame 11 side and is connected to the through hole 8.
a placed at the center of the other. A thin circumferential portion to which the voice coil 15 is attached is formed on the lower side of the outer ring portion 12b.

This voice coil 15 is located within a predetermined gap lO provided between the protruding portion 7c of the yoke 7 formed in the magnetic circuit portion and the pole piece 9.

On the other hand, the armature lower part 12c of the armature 12 is formed in a cylindrical shape, and a central protrusion is provided at the lower end thereof. The rear suspension 14 is attached to this central protrusion, and is configured to support the armature 12 together with the front suspension gin 13 at the center of the magnetic circuit section. In addition, the thin film installed on the frame 11 is used to protect the magnetic circuit from dust and moisture.
It is 6.

A vibration radiation contact piece 5 having an outer diameter approximately the same as the outer diameter of the frame 11 is fixed to the center mouth of the armature upper part 12a configured as described above. Therefore, when an electrical signal is input to the voice coil 15 via the printed circuit board 17, the armature 12 vibrates in the X direction depending on the magnitude of the signal, and this vibration is transmitted via the vibration radiation contact piece 5. The sound is transmitted to the thin flat plate portion 3 and becomes audible as audio.

Similar effects can be obtained by using an electric-vibration converter 32, which will be described next, in place of the electric-vibration converter 6 described above.

This electric-vibration converter 32 has a structure shown in FIG. A cylindrical magnet 25 smaller than the inner diameter of the protrusion 24b is stacked at the center of the yoke 24, and a disc-shaped pole piece 26 is provided on the upper surface of the magnet 25. A predetermined gap 27 is provided between the pole piece 26 and the protrusion 24b of the yoke 24 to form a magnetic circuit section, and this magnetic circuit section is molded by the frame 28.

The frame 28 has a bottomed cylindrical shape with an opening 28a on the upper surface, and a stepped portion 28b is formed in the opening 28a, and a plurality of suspensions 30 are arranged in the central direction of the stepped portion 28b. It is installed facing the direction. This suspension 30 is provided with a disc-shaped vibration radiation contact piece 29 whose back surface is placed inside, and a cylindrical part is formed at the lower peripheral part of this vibration radiation contact piece 29. A voice coil 31 is provided, and this voice coil 31 is disposed within a predetermined gap 27 between the protrusion 24b of the cork 24 and the pole piece 26. Thereby, by inputting an electric signal to the voice coil 31, the vibration radiation contact piece 29 vibrates in a uniaxial direction in the vertical direction in the figure.

Even if the vibration radiation contact piece 29 of such an electric-vibration converter 32 is attached to the thin flat plate portion 3, the operation and effect are exactly the same.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. 5 and 6.

In FIGS. 5 and 6, 18 is the front outer casing, 19
2 is the rear outer casing, 20 is the tightening screw, 21 is the thin flat plate part, 2
2 is a thin elastic body, 4 is a mounting screw, 5 is a vibration radiation contact piece, 6
is an electro-vibration converter.

The front outer casing 18 is a frame with an oval shape in cross section and is formed into a substantially rectangular shape, and the entire center portion is an open opening 18a, and a protrusion 18 is provided at the inner peripheral edge of the opening 18a.
b is provided over the entire surface of the grill.

Tap holes 18c are provided at a plurality of locations on the rear end surface of the outer circumferential frame, which is opposite to the opening 18a.

This tapped hole 18c is a screw hole for mounting the rear outer casing 19.

The rear outer casing 19 is an outer casing attached to the front outer casing 18, and its outer periphery has an end face portion 19a of the same size as the front outer casing 18, and the rear thereof has a predetermined width and is connected to the open opening. It has a step portion of the same size as 18a, and the edge portion of this step portion corresponding to the opening 18a is provided with a protrusion 19b similar to that provided at the opening 18a. At the rear where this protruding part 19b is provided, the back part 19 drops further deeper.
c is provided, and the rear outer casing 19 is configured in a box shape with an opening on one side. The rear surface of the end surface 19a of the rear outer casing 19 is provided with screw holes 19d having counterbore holes at a plurality of locations, and the front outer casing 18 and the rear outer casing 19 are connected by tightening screws 20. are configured to be combined. By this combination, the front outer casing 18
A groove portion 23 is formed between the rear outer casing 19 and the rear outer casing 19, and a thin flat plate portion 2I is held within this groove portion 23.

The thin flat plate part 21 is a flat plate having appropriate elasticity, and has a stepped part 21a in the center thereof that accommodates the head 4a of the mounting screw 4. An insertion hole 21b is provided through which the portion 4b is inserted.

A film surface 2 of a painting or photograph is mounted on the side on which the mounting screw 4 is mounted, and the head 4a of the mounting screw 4 is concealed by this mounting. A thin elastic body 2 is provided on the front and rear end surfaces of the outer peripheral end of the thin flat plate portion 21.
2 is installed. This thin elastic body 22 is installed in the protruding part 18b of the front outer casing 1B and in the protruding part 19b of the rear outer casing 19, and connects the thin flat plate part 21 and the film surface 2 of a painting or photograph to the groove. 23 so as to make elastic contact.

An electric-vibration converter 6 having a vibration radiation contact piece 5 is attached to the central rear side of the thin flat plate portion 21 via a mounting screw 4. This electric-vibration converter 6 is the same as that used in the first embodiment, and this uniaxial vibration allows the thin flat plate portion 21 to generate sound in response to an electric signal. Note that the same effect can be obtained even if the thin flat plate portion 21 is attached within the groove portion 23 without using the thin elastic body 22.

(Effects of the Invention) As explained above, the panel type speaker of the present invention has the following features: (1) A thin flat plate part on which paintings, photographs, etc. are arbitrarily attached on the front side and a connecting part for receiving vibrations on the rear side; ,
This panel type speaker is characterized by being provided with an electric-vibration converter connected to the thin flat plate portion and radiating vibrations in the l-axis direction, and with this configuration, a reduction in thickness can be expected.

(2) Paintings, photographs, etc. can be arbitrarily attached to the front surface, and are sandwiched between the front outer casing and the rear outer casing either directly on the front and rear end surfaces of the outer peripheral edge or via a thin elastic body, and vibrating on the rear surface. This is a panel type speaker characterized by having a thin flat plate part provided with a connection part for receiving vibrations, and an electric-vibration converter connected to the thin flat plate part and radiating vibrations in the l-axis direction. Depending on the configuration, it has the feature of being able to cope with vibrations caused by large inputs.

The panel type speakers in (1) and (2) above are electric
The vibration output in the uniaxial direction of the vibration transducer can be efficiently transmitted to the thin flat plate part, and the thin flat plate part can be attached with a film surface of any painting or photograph to function as a panel board. It has the advantage of having a wide range of uses, not only for consumer use as an interior product that allows you to enjoy sound from any picture, but also for commercial use as a ``talking panel'' at exhibitions and the like.

In addition, the acoustic characteristics can be changed arbitrarily by controlling the weight of the electric-vibration converter itself, the stiffness of the suspension that supports the vibration system, and the material and hardness of the thin flat plate (panel board). Since it is possible,
By setting it in a well-balanced state, you can obtain more efficient acoustic characteristics.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is a front view of a panel-type speaker, FIG. 2 is a sectional view thereof, and FIG. 3 is an electric-vibration converter used in a panel-type speaker. FIG. 4 is a cross-sectional view of another embodiment of the same electric-vibration converter, and FIGS. 5 and 6 are a second embodiment of the present invention, and FIG.
The figure is a sectional view of a panel type speaker, Figure 6 is a rear view of the same, Figures 7 and 8 are conventional examples, Figure 7 is a sectional view of a panel type speaker with a small speaker attached, and Figure 8 is a piezoelectric FIG. 2 is a cross-sectional view of a panel-type speaker to which a molded polymer film is attached. 1...Outer case 2...Film surface for any paintings, photographs, etc. 3.21.
・Thin flat plate part 4... Mounting screw 5.29... Vibration radiation contact piece 6.32 18... Housing/thin elastic body Fig. 3 Fig. Fig. 6 Fig. Fig.

Claims (2)

[Claims] (1) A thin flat plate part to which paintings, photographs, etc. can be attached arbitrarily on the front side, and a connecting part for receiving vibrations on the rear side; A panel type speaker characterized by being equipped with a vibration converter. (2) Paintings, photographs, etc. can be arbitrarily attached to the front surface, and are sandwiched between the front outer casing and the rear outer casing directly or via a thin elastic body on the front and rear end surfaces of the outer peripheral edge, and are subjected to vibrations on the rear surface. What is claimed is: 1. A panel-type speaker comprising: a thin flat plate portion provided with a connecting portion for the purpose of the connection; and an electric-vibration converter connected to the thin flat plate portion and radiating vibration in a uniaxial direction.