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JPS53127527

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DESCRIPTION JPS53127527
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an electromagnetic
electroacoustic transducer showing a conventional electroacoustic transducer, and FIG. 2 is an
electromagnetic electroacoustic transducer showing an embodiment of the present invention.
FIG. 3 is a cross-sectional view of an electromagnetic electro-acoustic transducer showing
another embodiment of the present invention. 1.13, 24 ииииииии Diaphragm, 2, 14, 25 и и и и и и Moving
iron piece of soft magnetic material, 3, 15, 26 и и и и и и Permanent magnet, 4, 16, 27 ...... coil, 5 ......
coil frame, the magnetic core of 6,18.29 ...... soft magnetic, 7 ░ 19.30 ...... soft magnetic material
Stator of 8, 20 ░ 31 и и и и и и и и и и и Case, 9, 21, 32 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и 12 ░ water-resistant adhesive 17, 28 и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и ... и Cover combined upper and lower stoppers.
The present invention relates to an electroacoustic transducer in which a single stopper member
is provided on the upper and lower sides of a moving plate to improve waterproofness and
impact resistance. An object of the present invention is to provide a small-sized electroacoustic
transducer coil excellent in waterproofness and impact resistance for a watch. Although various
thermal types can be considered as the 1-d0), 1- to -1 electro-acoustic transducers, hereinafter,
explanation will be made with electro-IIM electro-acoustic transducers. FIG. 1 shows a
conventional compact electromagnetic type electroacoustic quality conversion. 1 is a diaphragm,
2 is a movable iron piece of a soft m-body fixed to an armature plate 1, 3 is a permanent meteor,
4 is a core, 51 is a coil frame, 6 is a soft magnetic core, 7 Soft magnetic stator, 8 case,? #I coil
leaker, 10 is a cover, 11 is a diaphragm constant ring, 12 is an adhesive for a moving plate 2 and
waterproof. The electro-acoustic transducer acts as an electrical to acoustic transducer and an
acoustic to electrical transducer. In the former case, the attraction force of the movable iron
piece 2 is changed by adding the coil 4 VC alternating voltage ?, and along with this, the
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vibration [1 vibrates to generate noise, and the latter is peristaltic due to an external plaster.
Since this is a reversible operation in which the coil 4v voltage is induced by w i w t w s, the
following description will be made of the amount of electric to acoustic conversion used as a
speaker. As the small-sized electric 1IIlll speaker used for a watch has a small diameter of
vibration 1N, it is difficult to secure the volume-to increase the volume, K increases the amplitude
of the diaphragm There must be. There are a thousand ways to increase the amount of change in
the suction force by increasing the current flowing through the coil, and a method to make the
rigidity small by making the thickness of the diaphragm thin and make it easy to vibrate. As the
power needs to be as low as possible, we have to adopt the latter. However, if the rigidity of the
diaphragm is reduced, there is a fatal defect in use for a wristwatch that the diaphragm is
deformed and damaged by external force such as lick impact or water pressure, which is weak in
strength. The second embodiment of the present invention eliminates such a defect, and an
embodiment thereof is shown in FIG. 22 ?? ? ? ? ? ? ? ?, 17Fi lower stop ? # #! It is
the same as H @ 1. The upper stopper 22 and the lower stopper 17 are positioned at the bottom
of the diaphragm 13 and the movable iron piece +41 ij. However, at that time, the vibration [13
and the empty Il length of the upper and lower stopper 22.17 for the movable iron piece 14 The
size must be such that it does not interfere with normal vibration, and the size of the lamp
stopper against external force, that is, the gap length in the elastic rod of the peristaltic plate 13,
thereby the external force Even if is added, the diaphragm 13F1 does not sag within the elastic
limit, does not cause permanent deformation or breakage.
In the embodiment of FIG. 1I, the upper stopper 22 # in the embodiment of FIG. 2I, the
diaphragm fixing ring 11s in FIG. The lower stopper j7ij also serves as the cover 10 tube and also
serves as the coil frame 5 similarly to the lower stopper j7ij, thus reducing the cost by reducing
the number of parts. The embodiment of FIG. 2 relates to an electromagnetic type speaker for
waterproofing such as a watch or the like, but an embodiment in which waterproofing is required
is shown in FIG. This Fi diaphragm 24i is similar to FIG. 2 except that it is not fixed by adhesion.
In this case, the diaphragm 24Fi is only attracted to the case 31 by the attraction force of the
magnet 26 and the movable iron piece 25, and the boundary condition of the lift movement is
the peripheral support, as shown in FIG. 1 and FIG. The amplitude is easier to take than in the
fixed case. Because it is possible to use a vibrating plate with a relatively thick plate that is
dangerous and that is advantageous in terms of strength, even in this case, permanent
deformation or breakage of the vibrating plate 24 due to external force is considered as -4 =, and
KFi is large. It is conceivable that one vibration [24 may come off from the case 51 when the
external force acts in the opposite direction to the attraction force of the magnet 26, but such a
defect can be eliminated if the stopper is installed as in the present invention. As described
above, by using a structural tube in which one stopper member is installed above and below the
diaphragm as in the present invention, it is possible to obtain a waterproof and impact resistant
electric carnet about a watch, and its effect is great. The present invention is not limited to the
embodiments described so far, and can be applied to an electroacoustic transducer having
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vibration @, for example, a piezoelectric electroacoustic transducer, which exhibits the same
effect, and its application range There is a very wide one.
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