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JPS5418724

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DESCRIPTION JPS5418724
Description 1, title of the invention
Flat acoustic transducer
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a planar acoustic
transducer with an improved drive. As a flat speaker, one having a structure shown in FIG. 1 is
commercially available. In this case, the coil bobbin 2 is directly joined to the flat diaphragm 1,
and the rotor flat diaphragm 1 is directly driven to this. However, the diameter of the coil bobbin
2 is smaller than that of the diaphragm 1 The balance is 忌。 養 養 small nourishment. The
vibrational energy is uniformly transmitted to the diaphragm 1 and becomes less than t. Also, in
this conventional type, there is a disadvantage that the mechanical strength for transmitting
vibration and force to the diaphragm 1 is lowered. The present invention is intended to improve
such points, and by interposing a conical drive member between the flat diaphragm and the coil
bobbin and preventing a change of air in a portion surrounded by the drive portion OY. It is an
object of the present invention to provide a planar acoustic diaphragm in which the vibration
energy transfer between the voice coil and the voice coil per day j is improved. Hereinafter, an
embodiment will be described with reference to FIG. 2. EndPage: 1 and 3 are plate-like truncated
cone-shaped drive members consisting of light weight members such as resin, etc. A portion
joined to the back surface of the coil 1 and fitted to the top is fitted and joined to the outer
periphery of the coil bobbin 2. That is, the large diameter portion of the drive member 3 is joined
to the diaphragm 1, and the small diameter portion is joined to the coil bobbin 2. Then, on the
side of the coil bobbin 2 of the drive member 3, a shield plate 4 made of the same lightweight
material is joined, and the space is sealed by this. Note that a five-piece damper, 8 is a plate, 71'i
annular magnet, 8 is a voice coil, 9 is a center ball, and a plurality of air escape holes are
appropriately spaced circumferentially in the lower part of the magnetic gap of the center pole 9
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1
9a is formed. In the above, when the electromagnetic drive force in the vertical direction acts on
the voice coil 8, the drive force is transmitted to the drive member 3 through the coil bobbin 2,
and the diaphragm 1 receives the drive force at the joint with the drive member 3 In addition to
this, the driving force is applied by the air pressure in the space A due to the vertical movement
of the shielding plate 4. Particularly in the latter case, the area of the shielding plate 4 is larger
than the area of the portion of the diaphragm 1 surrounded by the drive member 3 so that the
driving force is diffused and uniformly applied to the diaphragm 10 . That is, when the shielding
plate 4 is not provided, the air flow in the coil bobbin 2 circulates with the space portion, and the
air flow has rough and dense, so the portion surrounded by the driving member 3 of the
diaphragm 1 In addition, although the driving force by the air flow is added to the unevenness, as
described above, such a thing does not occur by the function of the shielding plate 40, and the
vibrational energy is uniformly applied.
Accordingly, the vibration transfer characteristic to the diaphragm 1 becomes good, the
followability is improved, and the acoustic property becomes good. In the above embodiment, the
cover plate 4 is a side member with the drive member 3, but it may be integrally formed. As
described above, according to the present invention, a substantially conical drive member
consisting of a plate member having a large diameter on the flat diaphragm side and a small
diameter on the coil bobbin side is interposed between the flat diaphragm and the coil bobbin
and surrounded by the drive member. Space is sealed. For this reason, since the driving force
from the coil bobbin is transmitted to the large diameter portion of the flat diaphragm via the
drive member, it is possible to drive the flat diaphragm with a diameter larger than that of the
coil bobbin without any problem. In addition, since the adverse effect of the air flow on the flat
diaphragm does not occur, the driving force is uniformly diffused, and hence the possibility of
occurrence of divided vibration is reduced, which is extremely advantageous for improving the
frequency characteristics.
4. Brief Description of the Drawings FIG. 1 is a half sectional view of a conventional acoustic
transducer, and FIG. 2 is a half sectional view according to this embodiment. 3 · · · · · · · Drive
member 4 · · · · · · shield plate Patent applicant Pioneer Corporation EndPage: 2
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