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The present invention relates to a free edge attachment method of a so-called free edge type
diaphragm in which an edge portion of a speaker diaphragm is separately formed.
Conventionally, as shown in FIG. 1, the free edge attachment method of the conventional
diaphragm for a speaker comprises an adhesive 3 between the large-diameter end peripheral
portion 1a of the frusto-conical oscillator 1 and the inner edge portion of the annular free edge 2.
A means to intervene and adhere was adopted. An adhesive used here (in view of not changing
the mechanical constant or the vibrational property of the vibrator 1 and the free edge 2, a
solvent type rubber adhesive was used. However, even with a solvent type rubber adhesive, the
mechanical constant of the diaphragm 1 and / or the free edge 2 is not satisfactory when the
vibrator 1 and / or the free edge second material is used. Or there is the disadvantage of causing
a large change in the oscillatory properties. The main reason for this is that the adhesive is often
insufficient or insufficient due to the difficulty of applying the adhesive uniformly to the proper
amount at the designated place. Adhesive amount, ↓ amount 4. When the mechanical constant
or vibrational property of the 4 extravagant 7 vibrator 1 and / or the free edge 2 is largely
changed, the adhesion is incomplete and it causes the failure due to vibration. The present
invention is a method of attaching a diaphragm edge made in view of the disadvantages as
described above. The present invention will be specifically described below with reference to the
drawings. The apparatus used in the present invention is, as illustrated in FIG. 2, an outer
peripheral portion of a lower die 6 having a substantially identical contact surface portion 6a for
mounting a frusto-conical vibrator 1 on the upper surface. A free-edge mounting table 5 having a
substantially identical contact surface 5a for mounting the free edge 2 on the upper surface
guided by the columns 6 fixed to the mold 6 is elastically supported by the spinning 4. A press
resonance cylinder 7a is attached to the upper side, and a pressing cylindrical body 7C for
moving the spring 4 by being elastically compressed by pressing the free edge mounting table 5
outside thereof is formed and disposed. The free edge bonding method of the speaker diaphragm
of the present invention is carried out using the above-described apparatus. With the upper die 7
moved upward, the vibrator 1 is placed on the lower die 6, and then the free edge 2 is placed on
the next free edge mounting table 5. Then, when the upper die 7 is moved downward, first, the
pressing cylinder 7C abuts on the free edge placement table 5 and moves downward while
elastically compressing the spring 4, and the large diameter peripheral edge portion 1 a of the
vibrating body 1 Then, the inner edge 2a of the free edge 2 is overlapped, and then the
resonance cylinder 7a abuts on the overlapped portion so that the overlapping portion is pressed
by the vibrating portion 7a and the lower die 6.
The pressing force and the simultaneous numbering vibration force are transmitted from the
vibrator 7b to the resonance cylinder 7a and applied, and after appropriate time elapses, the
bonding between the vibrator 1 and the free edge is completed by fusion. The upper mold 7 is
moved upward, and the free edge 2 is taken out of the mold as a speaker diaphragm joined to the
vibrator 1. The clamping pressure required to join the vibrator 1 and the free edge 2 is about
several hundred K when using a urethane foam material for the free edge 2 and using a paper
material for the vibrator. The vibrational force is applied superimposed on the clamping pressure,
and the magnitude of the vibrational amplitude is about several microns. The clamping pressure
and the vibration force need to be adjusted appropriately according to the material and shape of
the vibrator 1 and the free edge 2. As described above, according to the attachment method of
the diaphragm edge of the present invention, the clamping force and the vibration force are
applied to the overlapping portion of the diaphragm 1 diameter large end peripheral edge
portion 1a of the diaphragm of the speaker and the annular free edge 2 inner edge portion 2a. At
the same time, it is characterized in that the joint of the overlapping portion is measured by
applying simultaneously, and compared with the case of bonding using the adhesive of the
conventional example, the adhesive 3 is not used and accordingly the adhesive is dried The time
required for the bonding of the present invention is as short as 2-3 seconds, which does not
require a long time (usually several minutes to several hours to dry). In addition, since the
vibrator 1 and the free edge 2 are directly fused and joined without using the adhesive 3, the
mass of the diaphragm can be reduced, which leads to high efficiency of electroacoustics when
incorporated in a speaker. It can be converted. In addition, it has characteristics such as little
change in mechanical constant and vibrational property of the vibrator 1 and the free edge 2 as
in the case of using the adhesive 3.
Brief description of the drawings
FIG. 1 is a cross-sectional view of a speaker diaphragm, and FIG. 2 is an end view of a device used
in the present invention.
DESCRIPTION OF SYMBOLS 1 ... Vibrator, 2 ... Free edge, 3 ... Adhesive agent, 4 ... Spring, 5 ...
Free edge mounting base, 6 ... Lower mold, 7 ... Upper mold.