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JPS5350626

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DESCRIPTION JPS5350626
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views of the horn
type speaker according to the present invention, FIG. 1 is a cross-sectional view of FIG. is there.
FIG. 3 is a rear view of the same, and FIG. 4 is a side view of a conventional horn type speaker. 1a
is a horn, 1b is a support, 1 is a main body, 1f is an inner wall, 1g is a protrusion, 1h is an arcshaped split groove, 3 is a magnetic circuit, 3b is a yoke, 2 is a vibration system, and 2e is a
peripheral support , 1e are locking steps.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the construction of a horn
type speaker which has a reduced number of parts and which is extremely easy to assemble. An
example of a conventional horn-type speaker will be described with reference to FIG. 4. A domeshaped diaphragm and a voice coil are previously wound on a magnetic circuit portion 41
assembled in advance. The vibration system unit 42 integrally connected is disposed using a
gauge or the like so that the voice coil is positioned at the center of the magnetic gap, and is fixed
with several screws 42b or the like to apply a constant pressure to the spacer 42a. After that, the
horn portion 43 was bonded to the top of the magnetic circuit portion 41 from the upper side by
bonding or by a screw or the like. In addition, in the conventional structure of such a horn-type
speaker, in addition to requiring a large number of screws and adhesive fixing parts, the
installation work of screw holes on the upper surface of the magnetic circuit portion or each part
As a jig or the like is required to fix the ring concentrically, the assembly operation is extremely
troublesome. Also, in many cases, in the horn tweeter, the horn portion and the magnetic circuit
portion are adhered and fixed, but in such a structure, the defect portion can not be easily
replaced even if it is found that the component is defective after assembly. Had. This invention is
a horn type speaker in which the assembly is completed by the process of integrally molding the
horn portion and the magnetic circuit support portion and inserting the magnetic circuit portion
and the vibration system portion 3 at the center of the support portion. Hereinafter, FIGS. 1, 2
and 3 will be described in more detail. 1 and 2 are cross-sectional views taken along line 0-A and
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0-B of FIG. 3, respectively, and FIG. 3 is a rear view. In the figure, reference numeral 1 designates
a main body integrally formed with a support portion 1b having an inner wall 1f for inserting
and attaching a magnetic circuit portion consisting of a horn portion 1a, a magnet 3a1 yoke 3b
and a center ball 3C. (Not shown) is formed with a flange 1d having a mounting hole 1c to be
fixed. At the back of the bottom of the horn 1a, a locking step 1e to which the outer peripheral
edge of the vibration system 2 including the dome-shaped diaphragm 2as voice coil 2c1 coil
bobbin 2b, peripheral support 2e, and spacer 2d is to be locked A support portion 1 b having an
inner wall 1 f for inserting and attaching the magnetic circuit portion 3 is formed. Furthermore,
at least three or more projections 1g are provided on the inner wall 1f near the rear opening end
of the support 1b, and arc-shaped dividing grooves 1h are provided on the four opening end
faces centering on each of the projections 1g. A thin portion 11 is formed on the back of 1 g.
In order to assemble a horn-type speaker having such a structure, the coil bobbin 2b having the
peripheral support 2e and the peripheral coil 2c wound in advance is bonded to the dome
diaphragm 2a, and then the spacer 2d1 peripheral support +, 2e, spacer 2d The magnetic circuit
portion 3 is inserted along the inner wall 1f 'of the support portion 1b. At that time, the side wall
of the magnetic circuit portion 3 abuts on the projecting portion 1g and presses the projecting
portion 1g outward, that is, in the direction of the split groove 1h to bend the thin portion 11 of
the portion, resulting in the magnetic circuit portion 3 is held by the elastic restoring force of the
thin portion 11. Thus, the image pickup system unit 2 is engaged with the engagement step 1e,
and the magnetic circuit unit 3 is engaged with the inner wall 1f of the support unit 1b, and the
centers thereof are arranged to coincide with the center of the main body 1 The coil 2 is very
easily and accurately placed in the magnetic air gap. 1: 5: Further, the magnetic circuit portion 3
is elastically held in a state in which its 0 side surface is pressed forward by the projection
portion gKLQ , so a spacer 2d is interposed between the front surface of the yoke 3b and the
locking step 1e. The peripheral support portion 2e can be held at a constant pressure. As
described above, according to the present invention, the number of parts included in the
assembly -1 is small, and the entire assembly does not require a jig in the assembly, and the
process of only inserting each part into the main body is very easy. Be done. In addition, since
each component is disposed at the same center with respect to the main body, the positional
relationship between each component is extremely excellent, and it is accurate, and the
diaphragm peripheral support is held with a constant pressing force. It is possible to prevent the
deterioration of high-pitched sound formation. Furthermore, when a defect is found after
assembly, the magnetic circuit portion and the vibration system portion can be easily taken out
to the outside, respectively, so that defective components can be easily replaced, for example. .
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