JPS61101196A - Slender type flat speaker - Google Patents

Abstract

PURPOSE:To provide a loudspeaker thin in depth and a wide range sound reproducing frequency characteristic by constituting the titled speaker of a diaphragm having a vibration moving part obtained by disposing the desired number of vibrating elements in serial, a casing made of magnetic material, and a magnetic base obtained by disposing the desired number of vibration elements in series which forms a magnetic gap. CONSTITUTION:The magnetic base 1 is constituted of a magnetic board 11, permanent magnet 12, and a top yoke 13. On the magnetic board 11, plural holes 11a are drilled and form a bottom 11b and side yokes 11c and 11c. A vibrator 2 is constituted of a diaphragm 21 and voice coil 22. The diaphragm 21 is constituted of a vibrating moving part consisting of vibrating elements aligning in slender form in series, edge 21b, and a clamp 21c. The edge 21b is of convex form and to its upper part are continuously attached with elastic elements 21b'. Around respective vibrating elements 21a, the voice coil 22 is wound. In such configuration above, the elastic elements 21b provide the diaphragms 21 with a high complience. Also, because the entire range of the vibration moving part is driven uniformly, slender constitution is free from any problem.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flat speaker of a full-plane drive type speaker, and in particular to a front panel speaker that can be used for space-saving applications such as televisions, audio equipment, and automobiles. or elongated shape,
The present invention also relates to an elongated planar speaker configured to be thin.

BACKGROUND OF THE INVENTION Conventional cone-shaped speakers have a cone diaphragm shaped like an ellipse or an ellipse, as disclosed in Japanese Utility Model Application No. 59-106292, in order to meet the above-mentioned space-saving requirements. did. However, since the angle of inclination of the cone diaphragm differs greatly between the long axis direction and the short axis direction, the portion where the appropriate inclination angle can be obtained is limited to a narrow range at the center.

In other words, since the effective outer diameter of the cone diaphragm is small and the lowest resonant frequency increases, the reproducible frequency range is narrowed in both the bass and treble regions, making it difficult to cover the entire audible frequency range.

Problems to be Solved by the Present Invention The present invention has been made in view of the above-mentioned conventional problems.
It is an object of the present invention to provide an elongated flat-face speaker that has a low minimum resonance frequency, provides good reproduction frequency characteristics over a wide range without high-frequency attenuation, and is compatible with space-saving designs.

Means for Solving the Problems The slender planar speaker according to the present invention includes a diaphragm having a substantially planar slender shape and having a vibrating movable part in which a desired number of oscillating elements each having a voice coil wound thereon are disposed in series; A case made of a box made of a magnetic material and having a flange at the open end that adhesively supports the outer peripheral fixed part of the diaphragm, and a desired number of voice coils arranged in series on the bottom of the case to hold the voice coil in the magnetic gap so as to be able to vibrate freely. It is characterized by comprising a magnetic base forming a magnetic gap arranged therein.

Embodiments of the present invention Below, a first embodiment of the elongated flat speaker according to the present invention will be described.
This will be explained in detail based on the figures.

The horizontally elongated planar speaker is roughly composed of a magnetic base 1, a vibrating body 2, and a case 3.

The magnetic base 1 is composed of a magnetic plate 11, a permanent magnet 12, and a top yoke 13. The magnetic plate 11 is formed by bending a rectangular flat plate made of a magnetic material into a substantially U-shape in which a plurality of holes 11a are bored at desired positions.
b and the side yoke portion 11C911c.

A permanent magnet 12.12 having a rectangular cross section is fixedly provided on the bottom surface 11b of the magnetic plate 11.
．． 12, the side yoke portion 11c, 1
1c and the top yoke 13 that constitutes the magnetic gap G, G.
．． Fix 13 (・ru.

The vibrating body 2 includes a diaphragm 21 and a voice coil 22. The diaphragm 21 has a vibrating movable part in which vibrating elements 21a, 21a each having a substantially U-shaped cross section are arranged in a long and narrow series, and a height equivalent to that of the vibrating element 2ia arranged on the outer periphery of the vibrating movable part. It is composed of an edge portion 21b configured in a convex shape having a dimension, and a fixing portion 21c provided on the outer periphery of the edge portion 21b. Furthermore, the vibration element 21a is provided with a reinforcing groove 21 for a reinforcing effect.
a' is provided. Further, as shown in FIGS. 2 and 3, the edge portion 21b is configured in a convex shape having a wall portion and a ridgeline that are erected substantially parallel to the vibration direction of the diaphragm 21. A telescopic element 21b' constituted by a substantially diamond-shaped groove is connected to the upper part of the edge portion 21b.

A voice coil 22 is wound and fixed around the outer periphery of each vibrating element 21a of the diaphragm 21.

The case 3 is constructed by forming a flat plate made of a magnetic material into an elongated box shape by drawing or the like.A flange 31 is provided around the open end of the case 3, and a plurality of holes 32a are bored in the bottom surface 32. It is set up.

4 is a lead wire, and 5 is an insulating plate provided with a terminal 5a.

By assembling the two magnetic base bodies 1, 1 and the vibrating body 2 to the case 3, the horizontally elongated planar speaker is completed.

More specifically, as shown in FIG. 4, two magnetic substrates 1, 1 are fixedly arranged in series on the bottom surface 32 of the case 3 with a certain distance between them.

Next, the fixed part 21c of the diaphragm 21 in the vibrating body 2
is glued to the flange 31 of the case 3. At this time, the voice coil 22 of the vibrating body 2 is held in the magnetic gear sock G of the magnetic base 1 so as to be able to vibrate freely.

Next, the gasket 6 is adhered to the fixing part 21c of the diaphragm 21, and the nonwoven fabric γ is adhered to the outside of the bottom part 32 of the case 3, thereby completing the horizontally elongated flat speaker.

Effect of the Embodiment The vibrating movable part of the diaphragm 21 in the elongated planar speaker with the above configuration is a magnetic gear G with a high magnetic flux density.
When a voice current is applied to the voice coil 22 held within the voice coil 22, the edge portion 21b, which has a uniform elastic holding force all around its circumference, vibrates with the degree of freedom in the vertical direction as shown in FIG. 3 due to the elastic deformation of the edge portion 21b and generates a voice.

Especially in the low range where the amplitude of the diaphragm 21 is thick (
Since the stretchable elements 21b are arranged in series at appropriate locations on the edge portion 21b, the accordion action of the stretchable elements 21b provides the diaphragm 21 with high degree of compliance. Furthermore, the edge portion 21b not only has high compliance but also has the function of preventing the diaphragm 21 from being driven in directions other than the vibration direction.

As described above, in the elongated planar speaker of the present invention, the vibration drive unit is not concentrated at the center like a cone-shaped speaker, but in order to uniformly drive the entire area of the vibration movable unit, a plurality of vibration elements 21a are used as in the present invention. Diaphragms 21 are arranged vertically in series.
There is no problem in configuring it into a rectangle with a large aspect ratio,
Speaker characteristics that are always averaged over the entire area can be obtained.

The speaker characteristic diagram shown in FIG. 5 is a comparison of the speaker characteristics of a cone-shaped speaker made of a vibrating body of approximately the same size and a slender planar speaker of the present invention.As can be seen from this speaker characteristic diagram, Good speaker characteristics of the full-plane drive type speaker can be seen in the sound range and treble range.

In addition, in the elongated flat speaker having the above configuration, case 3
Since it is made of a magnetic material and has a box shape that covers the magnetic base 1, the case 3 has the effect of almost completely blocking leakage magnetic flux from the magnetic base 1.

Effects of the present invention (a) The slender planar speaker of the present invention has an elongated front speaker shape without deteriorating speaker characteristics.
In addition, since it can be configured thinly, it can fully meet the needs for space saving. It is particularly useful as an automobile speaker because it can be installed in a narrow space inside a vehicle such as an automobile.

(b) There is almost no magnetic flux leakage, and there is no adverse effect on electrical components installed around the speaker.
Special effects can be obtained when used in televisions, audio equipment, and automobiles.

[Brief explanation of drawings]

1 to 4 show an embodiment of an elongated flat speaker according to the present invention, in which FIG. 1 is a front view, FIG. 2 is a sectional view taken along the line A--A in FIG. 1, and FIG. FIG. 3 is a sectional view taken along the line B--B in FIG. 1, and FIG. 4 is a front view with the vibrating body removed. FIG. 5 is a speaker characteristic diagram. DESCRIPTION OF SYMBOLS 1... Magnetic base, 11... Magnetic plate, 12... Permanent magnet, 13... Top yoke, 2... Vibrating body, 2
DESCRIPTION OF SYMBOLS 1...Diaphragm, 21a...Vibration element, 22.
...Voice coil, 3...-Case Fig. 1 A'' Fig. 2 Fig. 41!1

Claims (1)

[Claims] A diaphragm having a substantially planar elongated shape having a vibrating movable part in which a desired number of vibrating elements each having a voice coil wound thereon are arranged in series, and a flange part at an open end for adhesively supporting a fixed part of the outer periphery of the diaphragm. An elongated device comprising: a case made of a box made of magnetic material; and a desired number of magnetic substrates forming a magnetic gap arranged in series on the bottom of the case to hold the voice coil in the magnetic gap so as to vibrate freely. flat speaker.