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JPS56123694

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS56123694
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
passive radiator, and FIGS. 2 and 3 are cross-sectional views of an embodiment of the present
invention. Explanation of the symbols of the main parts, 3 ииииии Diaphragm, 4 ииииииии Bobbin, 5
иииииииииииииии Damper.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a passive lanator
used in a speaker system, and in particular to a mounting structure of a damper of a passive
lanrator and a bovi /, a panon blanc etaha, a speaker system and a kelbass reflex cabinet. A
speaker with only a diaphragm without a magnetic circuit or-"-72 yd 7 voice coil, which can be
used to perform an action corresponding to a port, and which can flatten the low frequency
characteristics of the speaker stem to lower frequencies Fig. 1 shows the cross-sectional
structure of a Pan-Pan radiator, which is, for example, a flat diaphragm 3 provided via an Elan 2
bathed and mounted around the upper part of the frame 1 The diaphragm 3 is further fixed to
the upper opening end portion IF of the cylindrical member 4 which corresponds to a voice coil
bobbin of a normal speaker. The damper 5 is adhered near the lower open end of the bobbin 4
and the damper 5 carrying the bobbin 4 and the diaphragm 3 is a base portion of the frame 1
through the damper base 6. The hole diameter of the central opening of the damper 5 is set to be
substantially equal to the outer diameter of the bobbin 4, and the bobbin 4 is inserted into the
central opening of the damper. 1 and 2 are used to bond the two together. Therefore, when
bonding the bobbin and the damper, the positioning of the diaphragm 3 in the height direction
needs to be accurately performed. In the present situation, which is time-consuming and causes
cost increase, the purpose of the present invention is to easily assemble and reduce the cost
without requiring the same jig at the time of assembly. The structure of the variable 2 According
to the sixth aspect of the present invention, there is provided a damper having a hole
substantially equal to or smaller than the opening area of a bobbin (cylindrical member) to which
a vibration plate is attached. The open end of the bobbin is mounted on and fixed to the upper
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surface of the bath. Further, by forming a rib around the hole of the damper, the positioning
between the bobbin and the damper can be more accurately performed and the strength of the
damper is improved. Hereinafter, the present invention will be described with reference to the
drawings. FIG. 2 is a cross-sectional view showing an embodiment of the present invention, and
the same parts as in FIG. The diameter of the central hole of the damper member 5 is smaller
than the inner diameter of the bobbin 4 as shown in the drawing, so that the area of the 3-hole
portion is smaller than the opening area of the damper. 5 is set in advance to the damper stand 6
The hobin 4 is inserted from above into the frame 1 so that the hovin 4 and the central hole of
the damper 5 are concentric with each other, and the hovin 4 is mounted on the upper surface
around the hole of the damper 5. The height of the diaphragm 3 is automatically determined so
as to contact 4 or more.
Therefore, it is better to fix both with a suitable adhesive or the like. Of course, the diameter of
the central hole of the damper 5 or the inner diameter of the bobbin 4 may be substantially the
same, that is, it may be substantially equal on both sides. FIG. 3 is a cross sectional view showing
another embodiment of the present invention. In this embodiment, in which the parts equivalent
to those in FIG. 2 are indicated by the same reference numerals, a rising rib 5a is provided
around the hole of the damper 5. Therefore, the lower end opening of the bobbin 4 and the rib
5a are inserted. The fitting has the advantage that the concentric attachment between the
damper 5 and the bobbin 4 is automatically made and the height of the diaphragm is also
positioned. Furthermore, the strength of the damper 5 is also increased. According to the present
invention, the assembly can be easily performed without using the same jig, and the
manufacturing time can be shortened and the cost can be reduced.
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