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JPS5092752

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DESCRIPTION JPS5092752
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional dome
speaker, FIG. 2 is a cross-sectional view of an inner peripheral driving dome speaker, and FIG. 3
is a cross sectional view of the inner peripheral driving dome speaker of the present invention. .
2 is a voice coil bobbin, 5 is a ring, and 1 is a dome diaphragm. −109−
DETAILED DESCRIPTION OF THE INVENTION The present invention improves the adhesion
strength of the dome diaphragm driving portion in the inner periphery driven dome diaphragm.
The fist structure of the inner periphery driven Zee bXt Pikaka-dark Ao Generally, the dome
speaker is as shown in FIG. The voice coil bobbin 2 is attached in the vicinity of the boundary
between the periphery of the dome diaphragm 1 and the outer peripheral support portion 9 and
the voice coil 3 wound around the voice coil bobbin 2 is disposed in the magnetic gap 4 and a
voice current is supplied to the voice coil 3 As a result, the voice coil bobbin 2 is vibrated up and
down, thereby vibrating the dome diaphragm 1. 2 However, with the above structure, as the
diameter of the dome diaphragm 1 becomes larger, the diameter of the voice coil bobbin 2 needs
to be larger, so a large magnetic gap, an inner volume are required, and thus a large magnetic
circuit is necessary. And had the drawback of rising costs. 1 To solve this defect, attach the voice
coil bobbin 2 with a small diameter to the inner periphery of the dome diaphragm 1 as shown in
Fig. 2 and enlarge the diameter of the dome diaphragm 1, that is, the acoustic radiation surface,
Because the area of the bonding part between the voice coil bobbin 2 and the dome diaphragm 1,
ie, the driving part of the dome diaphragm l, is small, it is necessary to be adhesive to strong
vibration at the time of large input Not enough or peeling often, it has the disadvantage of
making the speaker unusable. In addition, since the area of the bonding portion is small,
adhesion failure is likely to occur in the manufacturing process, and moreover, when dried, it
flows into the portion inserted into the magnetic gap 3 under the voice coil bobbin or the like to
obtain relief quality. And have a difficult drawback. The present invention secures a ring near the
upper end of the voice coil bobbin, thereby increasing the bonding area of the voice coil bobbin
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and the dome diaphragm, and also acting as a flow stopper for the adhesive, to achieve the
above-mentioned conventional inner circumference drive ratio. The disadvantages of the dome
dome diaphragm are solved at once. 3) The present invention will be described in more detail
with reference to FIG. 3-/-The ring 5 is fixed to the outer periphery or inner periphery of the
voice coil bobbin 2 at the upper end and the fixed portion with the dome diaphragm 1 Bond the
top surface of the dome 5 to the inside of the dome diaphragm 1. According to this structure, the
bonding area of the dome diaphragm 1 and the voice '-' coil bobbin 2 can be increased and a
large amount of adhesive can be used to firmly bond the both, so that the voice coil bobbin 2 and
dome can be used. The adhesive force of the diaphragm l is significantly increased, and it is
possible to prevent the two from breaking apart from the strong vibration at the time of large
input.
Also, since the ring 5 acts as a flow stopper for the adhesive, the adhesive 4 can be prevented
from flowing downward during drying, so defects in the manufacturing process can be
significantly reduced and a stable product of quality can be obtained. . In addition, since the ring
5 acts as a reinforcing member against radial deformation of the voice coil bobbin 2, the
generation of abnormal noise due to gear shift etc. can be prevented by itself, as in the present
invention, the inner circumferential drive type The dome speaker has ring 5 attached to the
upper end of the voice fill bobbin 2 and is adhered to the dome diaphragm 1 so that the
durability and input resistance characteristics of the speaker can be remarkably improved and
defects in manufacturing can be drastically reduced and stable products of quality can be
supplied. Also, it has the great advantage of being able to prevent abnormal noise such as gap
displacement and reproduce a good tone.
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2
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