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JPS63126400

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DESCRIPTION JPS63126400
[0001]
TECHNICAL FIELD The present invention relates to a speaker diaphragm used for general audio
equipment. Prior Art Conventionally, in a loudspeaker using a rectangular cone-shaped
diaphragm, the effect of split resonance appears prominently on the frequency characteristics,
and can not be corrected by the material of the cone diaphragm, molding conditions, etc. Affixing
was performing characteristic correction. In addition, if there is no margin in cost, it has to be
used in the state where the characteristic is not corrected. FIGS. 4 and 5 show examples of the
conventional rectangular cone-shaped diaphragm, in which 1 is a cone, 2 is an edge, and 3 is a
bonding surface of the cone 1 and the edge 2 with an adhesive. 6 and 7 are general examples in
which the characteristic correction piece 4 is attached to the conventional rectangular coneshaped diaphragm of FIG. The comparison of the frequency characteristics of the two is shown in
FIG. 8, and the solid line indicates one using the characteristic correction piece 4 and the broken
line indicates one not using the characteristic correction piece 4. Problems to be Solved by the
Invention The connecting surface 3 (FIG. 4) of the conventional cone-shaped diaphragm 1 with
the cone portion 1 and the edge portion 2 reduces the speaker sound pressure if the bonding
area is too large. Therefore, conventionally, it is assumed that the bonding area holds both
necessary minimum adhesive strengths, and the bonding width d is set to the same width in the
long direction and the short direction. In the case of a rectangular cone-shaped diaphragm, the
split resonance that comes from the shape appears prominently in the frequency characteristics,
and the large peaks and dips deteriorate the sound quality [the example of the conventional
frequency characteristics shown in FIG. See). Therefore, conventionally, the sound quality is not
improved (does not flatten the frequency characteristics), and another piece of the characteristic
correction piece 4 (material R is v, cloth, etc.) is bonded to the cone 1 as shown in FIG. However,
the number of parts was large and the workability of assembly was poor. The present invention is
to solve the same frequency characteristic improvement (sound quality improvement by
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flattening the frequency characteristic) without the characteristic correction piece which is a
separate piece. Means for Solving the Problems In order to solve the above problems, the present
invention has a shape in which the elongated material in the longitudinal direction is extended to
the center side of the cone in the range of 20% to 6Q of the cone taking plate area. It is set as the
composition put together. Operation With the above configuration, the split resonance in the
longitudinal direction can be damped to flatten the speaker frequency characteristics. EXAMPLES
Examples of the present invention will be described below with reference to the drawings. In FIG.
1 and FIG. 2, reference numeral 5 denotes a cone portion which is rectangular and made of a
resin film or the like and is formed into a cone shape, and a free edge 6 is attached to the outer
peripheral portion of the cone portion 5.
The free edge 6 is formed by extending the edge material in the longitudinal direction of the cone
5 to the center side of the cone 5 to a range of 20 to 50% of the diaphragm area, and the area of
the bonding face in the longitudinal direction is greatly increased. It is a thing. At present, as the
material of free edge e, mainly cloth. Although urethane or the like is used, the center part of the
edge material (the part where the cone diaphragm enters) is cut out and discarded after the edge
material is formed. The speaker diaphragm of the present invention utilizes the waste material
discarded as waste, and the conventional cone manufacturing method and process are the same,
and the cost is the same. The bonding area (cone part ? elastic part) and the shape that give the
most flat frequency characteristics are obtained by sampling. According to the sample
examination, the range in which the major axis direction edge material is extended to the center
side has less correction effect if it is 20% or less of the diaphragm area. The sound pressure drop
is large at 50 ?? or more. The sound quality improvement effect by flattening of the frequency
characteristic while looking at the frequency characteristic (shown by a solid line) of the
frequency characteristic in which the characteristic correction piece is pasted to the conventional
cone part of FIG. 8 and the diaphragm of the speaker diaphragm of the present invention of FIG.
Is achieved as well. According to the speaker diaphragm of the present invention, it is possible to
obtain flat characteristics and achieve the required improvement in sound quality without
increasing the cost. Further, the bonding area between the cone 5 and the free edge 6 is also
increased, and the bonding strength between the cone 6 and the free edge 6 is also improved.
Effects of the Invention As described above, the speaker diaphragm of the present invention is
required to have a rectangular shape from the effective use of the speaker space in today's set
slimming trend, and the sound quality improvement by its frequency characteristic flattening and
the cost response It provides technology for enhancing power and high reliability.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is a front view of a rectangular cone diaphragm of the present invention, FIG. 2 is a side
sectional view in the same long and short direction, and FIG. 3 is a conventional speaker
diaphragm and a speaker vibration of the present invention Loudspeaker frequency
characteristics with the board, Fig. 4 is a front view of a conventional cone, Fig. 5 is a side
sectional view of the same long and short direction, Fig. 6 and Fig. 7 are other conventional
speaker vibrations A front view and a side cross sectional view in which a characteristic
correction piece is attached to a plate, and FIG. 8 shows a speaker frequency characteristic chart
according to the presence or absence of the characteristic correction piece in the conventional
speaker diaphragm.
5 иии Cone portion, 6 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и adhesion surface. Name of
Agent Attorney Nakao Toshio and others 1 person Figure 2 X Figure 3, 50 100 810 5 m IOm B%
5 aoa ttyooo z?m Shoulder U (Hl) Figure 4 Figure 5
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