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DESCRIPTION JPS56147692

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DESCRIPTION JPS56147692
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of one embodiment of a
speaker provided with a frame according to the present invention, FIG. 2 is a rear view thereof,
FIG. 3 a is a sectional view taken along line A - A of FIG. 2 , B is a sectional view taken along line
B - B in FIG. 2, and FIG. 4 is a rear view of another embodiment according to the present
invention. Explanation of the sign of the main part, 2 · · · · · · pole piece, 3 · · · magnet, 5 · · · · · ·
voice coil, 7 ... ... damper, ... .. diaphragm, 10 ... edge, 11 ... frame, 12 ... gasket, 15 ... mounting
hole, 16 ... protruding Department.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The present invention relates to a
loudspeaker frame, a portion of a speaker frame which is generally used at present is provided
with a portion for mounting a gasket and an edge. When the speaker is attached to the speaker
cabinet, it is fixed at the flat portion of the speaker frame. Normally, fixing of the speaker frame
and the cabinet is carried out with a nail, but in this case, in the vicinity of the fixed position and
the intermediate portion between the fixed positions, there is a difference in how force is applied
by screw tightening There is and it is not uniform. For this reason, as in the case of a largediameter speaker, in the case where the space at the fixed position is wide, when using a material
with poor strength as in the iron plate frame, or when the flatness hardly occurs due to a shape
or processing problem, the cabinet and the speaker frame Causing resonance and causing
abnormality. In order to prevent the occurrence of this abnormal sound, conventionally, a
method of inserting a packing such as foamed polyethylene, rubber or foamed rubber between
the cabinet and the speaker frame, a method of narrowing the interval of the fixed position of the
speaker frame, or the like is adopted However, in either method, the number of parts has
increased and the number of installation steps is increased, resulting in an increase in cost.
SUMMARY OF THE INVENTION The object of the present invention is to provide a simple
structure for ensuring the occurrence of abnormal sound due to resonance In order to prevent
the speaker frame from being damaged. The speaker frame according to the present invention is
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characterized in that a projecting portion is provided on a side of the flat portion 2 - 2 in contact
with the cabinet. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of
the present invention will now be described in detail with reference to the drawings. FIG. 1 is a
cross-sectional view of an example of a loudspeaker provided with a speaker frame according to
the present invention, in which a pole piece 2 is placed at the center portion of a back plate 1,
The magnet 3 is mounted. The plate 4 is placed on the magnet 3 and forms a magnetic gap with
the pole piece 2. In this magnetic gap, a voice coil bobbin 6 carrying a voice coil 5 is vibratably
inserted and is supported by a damper 7. A diaphragm 8 is coupled to the voice coil bobbin 6 at
its center hole, and a center cap 9 is furthermore capped. The periphery of the opening of the
diaphragm 8 is supported by the frame 11 via the edge IO 4, the edge 10 is flat with the gasket
12] aK of the frame 11] aK fixed 3, the lead of the voice coil 5 Line is attached to the side of the
frame 11 via the tinsel cord 13, when attaching a loudspeaker connected to the terminal 14 to a
cabinet (not shown), the rear surface of the flat portion 11 α of the frame 11 l and the surface
opposite to the surface to which the gasket 12 is fixed) are fixed by fixing means so as to contact
the front surface of the cabinet.
−。 As shown in FIG. 2, the frame 11 is formed with four mounting holes 15 each having, for
example, a substantially rounded angle with respect to the flat portion 11 (1), and the cabinet . The frame 11 also has a protrusion 16 on the rear face of its flat portion 11α. , The protrusions
16 are provided, for example, at substantially intermediate positions of the respective attachment
holes 15. When the speaker is fixed to the cabinet with normal torque as shown in the cross
section of FIG. 3, preferably all the protrusions are formed in the cabinet It has a contact area
with a cabinet which does not reduce it. The speaker provided with the frame having such a
structure is fixed to the cabinet with the four screws in the mounting hole 15, but also the
projection 4 - section 16 provided between the fixing positions is pressed against the cabinet
Because there is P, it seems that the apparent height is the upper 8 (1ffi ,, f is fixed, the number
of fixation screws is increased, and the interval between the fixed positions of the frame 11 has
been narrowed Can be obtained. Therefore, it is possible to prevent occurrence of abnormal
sound due to resonance generated between the cabinet and the frame. Further, since each
protruding portion 16 exhibits a spring effect 7 against the fixing screw at the time of fixing, the
speaker can be more reliably fixed to the cabinet. FIG. 4 is a rear view of another embodiment
according to the present invention , Eight projections 16 are provided for the four mounting
holes 15. These two protrusions 16 form two predetermined spaces between each of the
mounting holes 15, so when fixing to the cabinet, they are fixed at the top 12 positions by four
fixing screws It is possible to more reliably prevent the occurrence of abnormal sound due to
resonance occurring between the cabinet and the frame in order to ensure that the cabinet and
the frame have a simple structure and a small number of parts according to the present
invention. Occurrence before abnormality due to resonance occurring between the electrodes can
be reliably prevented. Accordingly, flatness of the flat portion of the frame does not have to be a
problem so much, so that workability can be improved.
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