JPS59193699A - Plane driving type speaker - Google Patents

Abstract

PURPOSE:To put a diaphragm in piston motion with stable inertia control and improve the exchange efficiency of a speaker by interlinking all driving conductors with magnetic flux and increasing driving force, and holding the high- precision driving conductors in a gap magnetic field. CONSTITUTION:The magnet element 1 of a plane driving type speaker is constituted by clamping both flanks of a rectangular rod magnet 11 by inversely-L- shaped pole pieces 12a and 12b and fixing a linear magnetic gap. Upper parts of both end surfaces of the pole pieces 12a and 12b are formed arcuately to form arcuate magnetic poles 14. A specific number of elements 1 constituted as above are arranged at specific intervals and united together with a circumferential frame body 2, and arcuate corrugated auxiliary pole pieces 3a and 3b having arcuate magnetic gaps 31a and 31b are fitted to both end parts of the elements 1 and arranged facing the magnetic poles 14. All driving conductors 5 are interlinked with the magnetic flux to increase the driving force, and held in the gap magnetic field, and the diaphragm is put in piston motion with stable inertia control, improving the exchange efficiency of the speaker.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a planar drive type speaker with high exchange efficiency.

Conventionally, this type of planar drive type speaker was configured to have a magnetic field and a driving conductor arranged almost over the entire surface of the diaphragm, applying an excitation force of equal amplitude and phase to each part, and driving the entire surface of the pickup plate. Its features are that it is a non-resonant speaker with less standing wave vibration to avoid, and the diaphragm is flat.
It is known as a converter with a shape close to the ideal without the four parts that cones envy. However, in the conventional single-plane drive type speaker described above, in order to configure the drive conductor to be distributed over the entire surface of the diaphragm and to move freely without contact within a narrow gap magnetic field, it is necessary to have good dimensional accuracy of each part. However, in reality, the gap width of the magnetic field is widened, so it is not possible to obtain a strong flux density, and the conversion efficiency is generally poor. In addition, in order for the planar drive type speaker to emit a constant acoustic output in a predetermined band and to have flat support, the diaphragm must be supported evenly around the entire circumference with a high degree of integrity, and the diaphragm must be supported as a so-called inertia-controlled vibration system. However, this is difficult to achieve with conventional planar drive speakers, and the edges of the diaphragm have insufficient center holding ability, resulting in unstable operation such as contact between the drive conductors, making it difficult to use speakers with high output in the bass range. was difficult to realize.

In view of the above-mentioned problems, the present invention improves the strength of the air gap magnetic field, intersects the magnetic flux throughout the drive conductor, increases the vibration force, and maintains the drive conductor with a high degree of stability within the air gap magnetic field. In addition, it is an object of the present invention to provide a planar drive type speaker with high exchange efficiency by causing the diaphragm to perform stable piston movement under inertia control.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the planar drive type speaker according to the present invention will be described in detail based on the accompanying drawings.

The planar drive type speaker according to the present invention is based on a magnetic element 1 shown in FIG. A rectangular bar magnet 11 of ferrite type or rare earth cobalt type is fixed to the magnet element 1 by sandwiching both sides of it with inverted-shaped pole beads 12a and 12b, and providing a linear solid gap 13. The upper portions of both end surfaces of the reverse-shaped pole pieces 12a and I2b are formed into a circular arc shape to form a circular arc magnetic pole 14.

As shown in FIGS. 2 to 5, an appropriate number of the magnet elements 1 are arranged at predetermined intervals 15, and are integrated with the surrounding frame 2. Additionally, there are arcuate magnetic gaps 31a at both ends of each ha magnet element.

3ib'l with circular arc waveform auxiliary pole piece 3a, 3
b is attached and arranged opposite to the arcuate magnetic pole 14.

As described above, a plurality of swinging magnets are attached to the upper part of the magnet M, which is made up of the frame 2, the magnet element 1, and the circular arc magnetic pole 14. A diaphragm 4ff roughly composed of a II element 41 and an edge portion 43 is arranged and configured as shown in FIGS. 2 and 5. The diaphragm 4 is
A vibrating element group formed by arranging the vibrating elements 41 in parallel in a substantially semi-cylindrical shape is 'lfl L, and a drive conductor mounting groove 42 is provided to securely arrange the drive conductor 5 at the joining ridge between the vibrating elements 41. It consists of The drive conductor mounting groove 42 is disposed in the straight abB air gap 13 and the circular arc air gap 15 in the stone body M in a non-contact manner. A driving conductor 5 having a predetermined resistance value as shown in FIG. 6 is inserted and fixed into the driving member-A mounting groove 42. As shown in FIG.

Further, the diaphragm 4 is provided with an edge portion 43 on its outer periphery as shown in FIG. The edge portion 43 is integrally constructed with the vibrating element 41, and has narrow slits 45, 46 connected by a plurality of bridges 44 to form an inner peripheral band 47. It is divided into an intermediate band 48 and an outer peripheral band 49. Further, on the edge portion 46 of the diaphragm 4, a copper foil 6.6' is divided into two by intermediate portions 4a and 4a' by etching or the like in advance, as shown in FIG. copper foil 6,
The end portions 5a and 5b of the drive conductor 5 are conductively fixed to appropriate portions of the drive conductor 6' with solder, and the drive conductor 5 is led out to the outside via copper foils 6 and 6'f.

As shown in FIG. 8, the diaphragm 4 constructed as described above has damping materials 6a and 6b made of polyurethane foam, soft felt, etc. pressed against both surfaces of the edge portion 43, thereby providing a damping effect. The frame body 20) is configured to give an effect.
The upper sound IN is attached to the J protrusion 2a to constitute the drive type speaker.

Next one! 1. ! II will be explained.

By arranging the magnet 1 and the circular arc magnetic pole 14 as described above, pole pieces i2a and 12b-5□□d
Since an arc magnetic field acts on r1, 06 flux is applied to the entire drive conductor 5? They work together to increase the vibrational force.

The edge portion 46 in the diaphragm 4 has M number of bridges 44.
The inner circumferential band 47 is
．． Since it is divided into the middle 1st river zone 48 and the outer zone 49,
The diaphragm 4 is mainly supported by an elastic body formed by the curved deformation of the intermediate phase 48 .

That is, the diaphragm 4 exerts a significantly large stiffness in the same plane as the diaphragm 4, but is flexible in the vertical direction, which is the vibration direction, and of course when the diaphragm 4 is stationary, Even during vibration driving, it has the effect of reliably holding within the magnetic gap.

Since the planar drive type speaker according to the present invention has an inclined structure and function, it has the following effects.

In other words, since it is possible to set a magnetic gap and to intersect the magnetic flux throughout the drive conductor, an effective strong magnetic flux density can be obtained, and a planar drive type speaker with good conversion efficiency can be obtained. can.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a magnet element in an embodiment of a planar drive type speaker according to the present invention, and FIG. 2 is an exploded perspective view of essential parts showing an embodiment of a planar, A-type speaker according to the present invention. , FIG. 6 is a plan view showing a llkl stone body in an embodiment of the flat lfi drive type speaker according to the invention, and FIGS. 4 and 5 are plan views showing the flat lfi drive type speaker according to the invention. FIG. 6 is a perspective view of the main parts showing one embodiment of the II/L type speaker, and FIG. FIG. 8 is a plan view showing a circular diaphragm in an embodiment of the planar drive type speaker according to the present invention, and FIG. 8 is a sectional view of a main part showing an embodiment of the planar drive type speaker θ) according to the present invention. 1...-Stone element, 11... Square bar magnet*
12a, 12b...Pole piece, 1ro.
・・・・Straight line - Ki Gatsbu. 14...Circular magnetic pole, 2...Frame 3a, 3
b...Circular waveform auxiliary pole piece, 31a
, 31b...Circular magnetic gap, 4...Vibration plate, 41...Vibration element. 42..., 1 drive conductor A groove, 43...
・Edge part, 44...Bridge, 45.46・
...Slit, 5...Drive conductor, 6a,
6b... Brake nail 1M... Vibrating body. 5 -578- Figure 5 1 1 M6 figure

Claims (2)

[Claims] (1) A magnet body in which a plurality of magnet elements having a magnetic gap are arranged in parallel at equal intervals and are arranged in parallel at equal intervals, and are made by sandwiching the sides of a square bar stone between two inverted pole pieces with arc-shaped ends. , each drive conductor through which a current flows in a direction corresponding to each magnetic field is arranged in each front gap, and vibrating elements each having a substantially semi-cylindrical shape are arranged in parallel. A photographic plate is fixed to each of the drive conductors at each joint ridge of the vibration element group, and is approximately constituted by the vibration element group that moves in parallel when a driving force from the drive conductor is applied to each joint ridge. , an edge portion is provided on the outer periphery of the diaphragm in order to impart elasticity to the diaphragm only in the driving direction, a slit is appropriately bored in the edge portion, and the edge portion is fixed via a braking member. A planar drive type speaker characterized by the following characteristics: (2) The planar drive type speaker according to claim 1, wherein the magnet body includes arcuate wave-shaped auxiliary pole pieces arranged at opposite ends of the magnet element θ.