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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker, and more particularly to the structure of a diaphragm. (Purpose) The present invention
is constructed in such a manner that the curvature is different from each other in the middle heat
II portion to the outer periphery, for example, the outer periphery is formed in a rectangular
shape, and the attachment with the frame is a portion having different lengths. When attaching a
bad 1 to cap to the diaphragm to the right with an adhesive etc. (= i l), 'this 1-the gap between
the cap and the diaphragm does not occur, and E is uniform around the entire circumference.
The purpose is to provide a speaker that can be in close contact with the speaker and enables
good sound reproduction. (Prior Art) FIG. 1 is a longitudinal cross-sectional view showing a
conventional direct radiation type speaker having a cone-shaped diaphragm, in which 1 is a
frame having a circular outer shape, and 2 is a voice coil at one end. A diaphragm attached to 3
and having the other end connected to the outer periphery of the frame 1 through an edge 4, 5 is
a damper for supporting the diaphragm 1, 6 is a center pole, 7 is a yoke, 8 is a magnet 1 ~. 9 is a
magnetic gap, and 10 is a circular Tas] to Chii / Tsuzo attached to the middle fire portion of the
diaphragm 2 with an adhesive or the like. In the conventional speaker configured in this manner,
the diaphragm 2 is formed to be completely axisymmetric in a conical shape, so the dust cap 10
is attached to the diaphragm 2 with an adhesive or the like. Are able to be fixed uniformly over
the entire circumference of each. On the other hand, as shown in FIG. 2, for example, a
diaphragm 12 having a portion having a mounting length different from that of the frame 11 is
taken on the frame 11 whose outer shape is formed in a rectangular shape (square) In the case
where “J ′ + J”, the diaphragm 12 and the frame 11 have a relationship (ie, from the central
opening of the diaphragm 12 to the opposite side A of the frame 11 and the diagonal B) l: J
distance becomes smaller, that is, C) -A0-B. Therefore, along with this, as shown in FIG. 3, in
order to correct the difference in the distance between −-Δ and O-B, the diaphragm 12 has an
outer peripheral portion from the middle fire opening or 1 no C. It is necessary to set the
curvatures so as to be different curvatures, so that O-Δ>, O-B so as to be integrally formed.
Accordingly, when the circular dust cap 13 is attached to the middle fire portion of the
diaphragm 12 formed as described above, the dust cap 13 is in close contact between the large
curvature O-A, but the curvature is small 0 Since between -8 is forced to be bonded to the
diaphragm 12 in a floating state from the diaphragm 12, the attachment of the diaphragm 1 to
the lath 1 can adhere uniformly to the entire portion of the attachment of the diaphragm 12, For
this reason, the diaphragm 12 may cause air leakage and overburden and the like.
In addition, stress is generated on the diaphragm 12 at the bonding portion of the Ges 1-cap 13
and this is distorted, and the voice coil mounted on the diaphragm 12 is asymmetry with respect
to the lens ball, and a predetermined magnetic torque is generated. A slip is held, 1 qf, the
diaphragm 12 can not be driven accurately by J-, and it is not good to want good sound
invention has been made in view of the above-mentioned drawbacks, and will be described in
detail according to an embodiment shown in FIG. Fig. 4 is a cross-sectional view of the main part
of the speaker according to the present invention, i.e., the north section showing the state of "I
T81 diaphragm and dust cap", and FIG. 5 forms a predetermined curvature on the diaphragm
shown in FIG. It is explanatory drawing at the time of doing. J3 in FIG. 4, for example, a frame 17
having a rectangular (square) outer shape (t1.j, O'-A ', O'-13') and a cone having a length
relationship of The first slide plate 14 has a voice coil attached thereto (from the central opening
15 to a predetermined height 11 (diameter D) from the central opening 15 to form the same
curvature, and further to the frame 17) " ) The outer periphery of the part is formed to have a
different curvature to the height H, so that the damage 1-kit 1G can be removed by a contact
agent etc. at a predetermined position within the height l-1 It is. Here, to describe the shape of
the diaphragm 14 more specifically, as shown in FIG. 5, the central opening 1! Of the diaphragm
14! (P) In order to form a predetermined curvature between the height 1-1 between the diameter
d and the diameter D, a point P is set at an arbitrary position that is axisymmetric of the
diaphragm 14 and the PI j λ And draw an arc of a flat diameter R1 at a point R on the diameter
d and a height of 11 from the point Q) J). Next, the center of the circle of radius R2 is included so
as to include one point B 'of the attachment t' of the outer peripheral portion located at the frame
'17 height from the opening 15 of the diaphragm 14 '. If a circular arc R-8 'is obtained on a
straight line connecting the points P-R, a circular cone of O'-[3 'having two different curvatures is
obtained. That is, the point R is a contact point of the arc of radius R1 and the arc of radius R2. If
radius R2 is calculated by division to positions A ′ and B ′ at all positions B ′ from J ′ to
O′−8 ′ to 0′−Δ ′ sequentially, it is 1-1 It is possible to form the diaphragm 14 which has
the same curvature at the height, and which is composed of different curvatures to the outer
periphery beyond this. Therefore, if the cap 1G is attached to the gasket 1 on the diaphragm 14
formed as described above (= J, fixing it with an adhesive within a height 1-1 within 1 to 1 mm)
results in a bad 1-kittub 1G The diaphragm 14 is adhered without any gap between tg and the
diaphragm 14 is used for air leakage and chattering <?
<, Sound can be reproduced well. (Effects) As described above, the speaker according to the
present invention is a speaker provided with a diaphragm having a curvature different from each
other from the middle fire opening to the right, and the center opening J of the diaphragm is
predetermined. In order to form the same curvature up to the height of, and to attach the dust to
the predetermined position within this height, for example, the diaphragm whose external shape
is formed in a rectangular state is Caps X and Z can be taken (== J, the cap can be uniformly
bonded over the entire circumference without any gap between it and the diaphragm), and the
diaphragm leaks air, chatter etc. While being able to drive J- accurately while maintaining a
predetermined magnetic force without causing the problem, good acoustic reproduction is
possible (it becomes a feature such as becoming one).
Brief description of the drawings
FIG. 1 is a longitudinal sectional view showing a conventional speaker, and FIG. 2 is a plan view
of a diaphragm with a frame formed in a rectangular state at the time of taking q (], FIG. [Fig. 4]
shows the diaphragm of the speaker according to the present invention and the diaphragm 1 of
the speaker according to the present invention and the diss FIG. 5I is an explanatory view
showing the curvature of the diaphragm of the speaker according to the present invention.
1.11.17 ... frame, 2.12.14 ... diaphragm, 3 ... voice = 1 yl, 6 ... center ball, 7 ... yoke, 8 ... magnet 1 .
10.13.16 ・ ・ ・ Dust ~ Ki 1 / Tsubu. Patent Assignee: Representative of Japan Pictor Co., Ltd. d:
Shindo-・ Part 1 Fig. 2 Fig. 2 a '54 Eye 5 Fig. 5
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