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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an end view of a cone speaker using a
conventional diaphragm, FIG. 2 is a longitudinal sectional view of a cone speaker using a
diaphragm according to the present invention, and FIG. It is a frequency characteristic figure and
a harmonics characteristic figure with a cone speaker which used a board, and a cone speaker
which used a diaphragm by this device-according to this invention. 6 ...... diaphragm 22 ......
bobbin, 25 ... ... central opening, 26 ...... convex, 28 ...... concave.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a diaphragm of a cone
speaker. As shown in 15 and 7 '%,------1zj & of the swing plate of the loudspeakers have a bowllike shape with an increase in diameter as it goes from the central part to the peripheral part and
a convex shape with respect to the inner side Is used. The angle O with respect to the driving
direction is the largest at the peripheral portion of this moving plate construction 021. In
addition, the area and diameter are maximized, and the edge is deformed by the edge 3iC fixed to
the frame 2 etc. In the case of a low / medium sound speaker which is most susceptible to
vibration, particularly as shown by the solid line in FIG. 3, the divided vibration occurs near the
edge 3 in the band of 100 OHz or more, resulting in dips in the frequency characteristics. (2
harmonics) increased, and it was not possible to reproduce with good sound quality. The object
of the present invention is to obtain a diaphragm for a cone speaker having good sound quality
and a high frequency band in which divided shooting motion occurs. The present invention will
be described based on one embodiment in which the present invention is applied to a cone
speaker shown in FIG. In the figure, 6 is a diaphragm, 8 is an edge, 10 is a pressure plate, 121 is
a frame, 14 is a center pole, 16 is a magnet, 18 is a tamper, 20 is a cap, 20 is a bobbin, and 24 is
a voice coil. The diaphragm 6 is formed on a convex surface 26 between the central portion "" 25
connected to the bobbin 22 to the vicinity of the peripheral portion to the central axis side, and
the peripheral portion is relative to the central axis side 2) The concave surface 28 is formed. The
convex surface has a large radius of curvature R, and the concave surface has a small radius of
curvature r. For example, in a cone speaker with a diameter of 30 cm, R is 700 m, r is 50 to 100
IIII11. The ratio of the length of the R portion to that of the r portion is 6: 1. The convex surface
26 and the four surfaces 28 are smoothly joined. The measurement results of this speaker and a
cone speaker using a conventional diaphragm are shown in FIG. In the same figure, the solid line
30 shows the frequency characteristic of the conventional one, the 1.1 solid line 32 or the same
harmonic distortion characteristic, the dotted line 34 shows the frequency characteristic of this
speaker, the dotted line 36 Is the same harmonic distortion characteristic. As can be seen from
FIG. 3, in the prior art, integral vibration occurs up to around 100 OHz, and thereafter divided
vibration starts 9 and frequency 11 dips in frequency, and the second harmonic increases. On the
other hand, in this speaker, there is not much dip up to around 2000 Hz, and second harmonic
distortion does not occur too much, and divided vibration occurs around around 2000 Hz.
Accordingly, the integral vibration region is extended to around 20001 (Z, frequency
characteristic -1,; and harmonic distortion characteristics are improved, and excellent sound
quality is obtained, ie, smooth (3) ha 1 "4 / one. This is because the peripheral portion most
susceptible to deformation is formed in the concave surface 28 to increase the mechanical
strength. Although the mechanical strength is weak at the boundary between the convex surface
26 and the concave surface 28, the surface is smoothly joined and does not deform so much as
compared with the deformation at the peripheral edge, so that the characteristic change does not
occur too much. . In the above embodiment, the ratio of R = 700 mm + r = 50 to 100 ° r to the
length of H is 1: 6, but the ratio is not limited to this and it is sufficient if the peripheral part can
be made concave. For example, the ratio of the lengths of r and R may be 1: 1. The boundary
between the concave surface 2B and the convex surface 26 may be thickened or a reinforcing
ring may be attached.
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