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3. Patent applicant's zip code 100 address Marunouchi 2-chome, Marunouchi, Chiyoda-ku, Tokyo
■ Japan Patent Office ■ JP-A-51-94320 Published Japan. (1976) 1.26 internal office serial
number (, 11-6555, specification 1, title of the invention
3. Detailed Description of the Invention The present invention relates to the improvement of a
speaker, and in particular, has a structure to obtain a flat frequency characteristic by smoothing
a sharp peak of a sound pressure level generated in a used frequency band. That is, the cone
paper (2) and the dustproof cap (3) supported by the damper (5) and the edge (4) in the bowllike frame (1) are vibrated by the electromagnetic action of the drive coil (9) It is. In such a
conventional speaker, as in the sound pressure frequency characteristic shown in FIG. 1 (1), the
frequency range from the working frequency range to the height of the fe is less than f and Ht It
often generated negative effects on the reproduction of faithful sounds. This frequency 11. The
steep LLI in is generally considered to be due to the following reasons. That is, when the
frequency is increased from the frequency tds, the cone paper (2) moves in the same phase as
one object ('piston motion is performed), but the cone paper (2) at f + It generates resonance that
is in opposite phase to the dust cap (3).
Therefore, the amplitude of the part centering on the dustproof cap (3) is extremely large
compared to the amplitude during piston motion, and this is done for EndPage: 1, as shown in
FIGS. 2 and 3 below. The present invention will be described in detail. In FIG. 2, (7) is an elastic
frame which is fixed to the edge of the frame (1) opposite to the corn paper (2) so as not to
disturb sound pressure radiation from the corn paper (2). It consists of a thin rod or cross. (6) is
a connector for connecting the frame (7) and the dustproof cap (3), and is formed of a viscoelastic body, such as urethane foam, which has extremely small rigidity as compared with the
frame (7). And these frameworks (7) and connectors (6) have frequencies 5. Is considered to have
the maximum damping effect. Now, the operation will be described according to the equivalent
vibration system shown in FIG. 3 (a). The framework (7) corresponds to the spring (9), and the
connector (6) corresponds to the damping material (t). The mass α force corresponds to the dust
cap (3) and the cone paper (2) at the frequency f, but the actual value is smaller than the actual
weight because it is the equivalent mass in the dynamic response It is another value. In such a
case, the amplitude characteristics in the equivalent vibration system are shown in FIG. 3 (1). The
valley at the frequency 9; 7 = the so-called anti-resonance point is a point at which the amplitude
does not appear even if there is a large input. Where: = spring constant of the framework m =
expressed as dynamic equivalent mass of cone paper and dust cap. And since the depth of this
valley is determined by the magnitude of the damping constant of the connector (6), it is adjusted
as a result and the high voltage frequency 4! Let the brow be flat as shown in Figure 2 ('b). For
example, if a urethane foam is used, it can be achieved by changing the cross-sectional shape and
the fine bubble rate of the size. It is an opening to lower the steep appearance of the highpressure label at the frequency f by adhesively bonding at the portion of the projection (8) using
such a damping portion. The operating frequency is further increased as shown in FIG. It is also
possible to grow up.
4 is a diagram for explaining the drawings in brief, (a) is a schematic diagram 1 showing an
equivalent vibration system, and (e) is a swing characteristic diagram. In the figure, (2) is cone
paper, (3) is a dustproof cap, (6) is a connector, and (7) is a frame. Agent Shinno Shin-1) Fig. 1 rs
Fig. 2 End Page: 2