JPS5932294A - Diaphragm construction of flat speaker - Google Patents

Abstract

PURPOSE:To prevent the generation of distortion attended with the vibration of a diaphragm, by forming a top of projection for a voice coil winding with lots of polygonal small projections, forming an R on the ridge line formed on the projection so as to increase sufficiently the surface rigidity of the projection. CONSTITUTION:Plural projections 10 are formed on the diaphragm 9 by swelling out the thin diaphragm 9, and the top of the projections 10 is made as lots of quadrangular pyramid small projections 11. Further, an R is given to the ridge 12 formed on the projections 10 and the diaphragm of a flat speaker is constituted. Plural projections 14 are formed on the diaphragm 13 by swelling the diaphragm 13, the top of the projections 14 is formed as lots of truncated quadrangular pyramid small projections 15 and an R is given to each ridge line 16 formed on the projections 14. Further, the surface rigidity of the projections 10 or 14 for the voice coil winding is improved to prevent the generation of distortion attended with the vibration of the diaphragm 9 or 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a diaphragm structure for a flat speaker in which the shape of a protrusion for winding a voice coil is improved.

As a flat-plate speaker, it would be useful to consider a main J-shaped speaker as shown in Figs. In other words, this bottom 1 inverted speaker is placed on the base plate 1'' as shown in Figure 1.
A frame body 2 whose lower ends are open 1'' is attached, and bellows-shaped support members 4, 4 are arranged in series between this base plate 1 and a flange 3 along the upper opening edge of the frame body 2. Support members 4, 4
The peripheral edge of the thin diaphragm 5 is sandwiched between the diaphragm 5 and the diaphragm 5.
A voice coil 7 is wound around a plurality of protrusions 6, and a permanent magnet 8 that cooperates with the voice coil 7 is attached to the base plate 1'' (=
It has a J-digit structure.

The protrusions 6 on such a flat speaker are formed by expanding the diaphragm 5 by vacuum forming or the like, and are therefore thinner than other parts. Therefore, as the protrusion 6 approaches the longitudinal center of the diaphragm 5, it may be distorted. However, when this vibrational strain occurs on the protrusion 6, audio distortion occurs.
It is desirable to increase the surface rigidity of this protrusion 6 so that vibration strain does not occur in the C1 protrusion 6.

Therefore, the present invention provides a flat speaker diaphragm in which the top of the protrusion for winding the voice coil is formed from a large number of small polyhedral protrusions, and the ridge line formed on the protrusion is marked with 1. By using this structure, the surface rigidity of the protrusion is increased,
This is characterized in that no vibration strain is generated on the protrusions that do not have f'1 due to the vibration of the diaphragm.

Next, this invention will be explained based on FIGS. 4 to 6.

FIGS. 4 and 5 show an embodiment of the present invention. In this embodiment, the diaphragm 9 is expanded.

Then, a plurality of protrusions IO are formed on the diaphragm 9, and the top of the protrusion 10 is formed from a large number of square pyramid-shaped small protrusions 11, and the ridge line 12 formed on the protrusion 10 is This is what I added. Although this embodiment shows an example in which the small protrusions 11 are formed into a square pyramid shape, that is, a pentahedral shape, the present invention is not necessarily limited to this, and the small protrusions provided on the diaphragm may be formed into other polyhedral shapes. It can also be formed into

FIG. 6 shows a modification of the small protrusion 11.

In this modification, the diaphragm 13 is bulged to form a plurality of protrusions 14 on the diaphragm 13, and the top of the protrusions 14 is formed by a large number of small protrusions 15 in the shape of truncated quadrangular pyramids. Each ridgeline 16 formed on the protrusion 14 is rounded.

Next, the functions of these diaphragm structures will be explained while comparing them with those shown in FIG.

Since both ends of the protrusion 6 shown in FIG. 1 have corners and high rigidity, the amplitude at the center of the protrusion 6 is large. Therefore, the protrusion 6 had a difference in amplitude in its longitudinal direction, which caused distortion in the sound.

However, the small protrusion 11 or 15 at the top of the protrusion 10 or 14
By forming this, a corner is formed up to the center of the protrusion 10 or 14, resulting in increased surface rigidity, and the rigidity of the protrusion 10 or 14 as a whole is increased. As a result, JM lJ board 9
, 13, the difference in amplitude distortion of the entire protrusion 10 or 14 in the longitudinal direction becomes smaller at both ends and the center, and the sound distortion is also reduced. That is, the small protrusion + 1, V- is 1
5 averages the stiffness of the protrusion lO or 14, and averages the amplitude.

As explained below, this idea involves forming the top of the protrusion for winding the voice coil from a large number of small polyhedral protrusions, and also creating a pattern on the ridgeline formed on each of the protrusions. ] Since the diaphragm structure of the diaphragm flat plate speaker is adopted, the surface rigidity of the protrusions can be sufficiently increased, and as a result, the occurrence of distortion due to vibration of the diaphragm can be sufficiently prevented.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a flat speaker, Figure 2 is I of Figure 1.
3 is a perspective view of the diaphragm shown in FIG. 1, FIG. 4 is a plan view of the diaphragm showing an embodiment of the present invention, and FIG. 5 is a sectional view taken along line I-II. A cross-sectional view along the ■-V line of
FIG. 6 is a partial sectional view of a diaphragm similar to FIG. 5, showing a modification of the small protrusion. 9... Vibration plate, 10... Protrusion, 11... Small protrusion,
12...Ridge line, 13...Diaphragm, 14...Protrusion,
15...Small protrusion, 16...Ridge line. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 6174

Claims (1)

[Scope of Claims] A diaphragm structure for a flat speaker in which 46 protrusions of several persimmons are provided on the diaphragm by protruding a thin diaphragm at a plurality of locations, wherein the top of each of the protrusions is A diaphragm structure for a J1 plate-type speaker, characterized in that it is formed from a large number of small polyhedral protrusions, and a ridge line formed on the protrusions is provided with a mark.