JP3892159B2 - Panel type speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a panel type speaker, and more particularly to a panel type speaker suitable for a multi-channel speaker.
[0002]
[Prior art]
Japanese Patent Application No. 9-59889 relating to the prior application of the present applicant discloses a panel type speaker. This panel type speaker includes an exciter composed of a magnetic circuit and a voice coil, and a diaphragm excited by the exciter. In this panel type speaker, the diaphragm is not rigid and does translational movement back and forth as in the conventional speaker, but the diaphragm bends and vibrates. For this reason, this panel type speaker is also called a DM (Distributed Mode) type speaker or a vibration mode type planar speaker.
[0003]
Japanese Patent Application No. 10-150641 related to the prior application of the present applicant discloses a double-sided panel type speaker in which an exciter is embedded and fixed in a diaphragm. Similarly, Japanese Patent Application No. 10-150642 related to the prior application of the present applicant discloses a panel type speaker in which a diaphragm is also used as a display panel such as a signboard.
[0004]
In movie theaters, a small number of small holes with a diameter of several millimeters are formed in a screen made of plastic plates, etc., and three-channel speakers (center, left, right, etc.) are placed on the back side of this screen to make it sound as if it were a screen. An acoustic system has been developed that produces an acoustic effect as if it had been emitted from.
[0005]
[Problems to be solved by the invention]
The screen of the movie theater or the like has a problem in that the image quality deteriorates because a small hole for passing sound from the back side to the front side is formed. In addition, a space for arranging speakers on the back side of the screen is required.
[0006]
[Means for Solving the Problems]
Panel type speaker of the present invention includes a plurality of exciter including a magnetic circuit and a voice coil, a panel type speaker vibration mode (DM) system that includes a plate-shaped diaphragm which is excited by these exciter. The diaphragm of the speaker includes a rigid core layer, and a front side skin layer and a back side skin layer formed on each of the front and back surfaces of the core layer. The core layer extends over an appropriate width. Each of the plurality of exciters is divided into a plurality of regions by a dividing band formed by removing a part or all of the core layer in the thickness direction, and each of the plurality of exciters is provided on the back side skin layer of each of the divided regions of the core layer. There with mounting et al is, skin layer of at least the surface side is continuous over a plurality of divided regions of the core layer.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to a preferred embodiment of the present invention, the back side skin layer of the diaphragm is divided into a plurality of regions that are the same as the core layer.
[0008]
According to another preferred embodiment of the present invention, the core layer of the diaphragm has a honeycomb structure.
[0009]
【Example】
1A and 1B are a perspective rear view (A) and a partially enlarged sectional view (B) showing a configuration of a diaphragm of a panel type speaker according to an embodiment of the present invention. As shown in the partial enlarged cross-sectional view (B), the diaphragm has a highly rigid core layer 1, a surface side skin layer 2 formed on the surface side of the core layer 1, and a back surface side of the core layer 1. It is comprised from the back surface side skin layer 3 formed. The core layer 1 and the skin layers 2 and 3 are all made of reinforced plastic (FRP) or the like, and the layers 1, 2 and 3 are fixed to each other with an appropriate adhesive. The core layer 1 actually has a hexagonal honeycomb structure, but for convenience of illustration, the core layer 1 is shown in a quadrangular shape as shown in the perspective rear view.
[0010]
As shown in a transparent rear view (A) viewed through the skin layer 3 on the back side, the diaphragm has a central part a, an upper left part b (viewed from the front side), a lower left part c, and a lower right part d. And the upper right portion e is divided into five regions. As shown in the partial enlarged cross-sectional view (B), each region is divided into a plurality of regions by a dividing band S from which a core layer 1 having a large rigidity is partially removed in the thickness direction over an appropriate width. The skin layer 3 on the back side is also removed across the width of the dividing band S.
[0011]
Five exciters (not shown) are attached to the central part of the back side skin layers of the five regions a to e through the adhesive layer. Each exciter excites the diaphragm in each region to generate sound. The sound generated in each region is partly removed in the thickness direction of the rigid core layer 1 in the divided band S formed in the boundary portion of each region. High-frequency vibration components do not propagate through the divided band S to other adjacent areas. That is, five substantially independent panel type speakers are formed.
[0012]
An appropriate paint for using the outer skin layer 2 as a movie screen is applied to the surface of the outer skin layer 2 and used as a movie theater or home theater screen.
[0013]
As described above, the configuration in which only a part of the core layer in the thickness direction is removed in the divided band S is shown. However, the dividing band S may be configured to remove all of the core layer in the thickness direction. A configuration in which the skin layer 3 on the back side is also removed together with the core layer 1 is illustrated. However, it is also possible to remove only the core layer 1 having a high rigidity and to make the skin layer 2 on the front surface side and the skin layer 3 on the back surface side having a low rigidity continuous.
[0014]
【The invention's effect】
As described above in detail, the panel-type speaker of the present invention has a rigid core layer in which a diaphragm is divided into a plurality of surfaces, and a front-side skin layer and a back surface formed on the front surface and the back surface of the core layer, respectively. composed of a side skin layer, by each of the exciter on the back side skin layer of the plurality of divided regions of the core layer is attached, it is constructed such that each operate as an independent speaker Rutotomoni, at least the surface side Since the skin layer has a configuration in which the core layer is continuous over a plurality of regions divided to improve the image quality of the screen, the image quality is not deteriorated when the skin layer is also used as a movie theater screen. In addition, there is an advantage that a space for arranging individual speakers on the back side of the screen becomes unnecessary.
[Brief description of the drawings]
FIGS. 1A and 1B are a transparent rear view (A) and a partially enlarged sectional view (B) showing a configuration of a diaphragm of a panel type speaker according to an embodiment of the present invention.
[Explanation of symbols]
1 Core layer 2 Surface side skin layer 3 Back side skin layer
a to e 5 regions S divided from each other

Claims (3)

A vibration mode (DM) type panel-type speaker comprising a plurality of exciters including a magnetic circuit and a voice coil, and a flat diaphragm excited by these exciters,
The diaphragm has a large core layer of rigid, and formed Rukoto from this surface skin layer formed on the respective front and rear surfaces of the core layer and the back-side skin layer,
The core layer is divided into a plurality of regions by a dividing band formed by removing a part or all of the core layer in the thickness direction over an appropriate width, and the back side of each of the divided regions of the core layer Each of the plurality of exciters is attached to the skin layer ;
At least the surface skin layer is continuous over a plurality of divided areas of the core layer;
Panel type speaker characterized by In claim 1,
The backside skin layer, the panel-type speaker, characterized in that it is divided into a plurality of regions corresponding to each of the divided regions of the core layer. In either claim 1 or 2,
The core layer is, the panel-type speaker, characterized in that exhibits a honeycomb structure.

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