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JPS57168397

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DESCRIPTION JPS57168397
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electrodynamic loudspeaker structure, and FIG. 2 is a structural cross-sectional view of a
conventional small-sized electrodynamic loudspeaker. FIG. 3 is a cross-sectional perspective view
of an electrodynamic speaker according to an embodiment of the present invention, and FIG. 4 is
a cross-sectional perspective view of an electrodynamic speaker according to another
embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Center pole, 2 ... Yoke, 3 ...
Permanent magnet, 4 ... Plate, 5 ... Voice coil,-6 ... Diaphragm, 7 ... Damper, 8 ... · Frame, 21 · · ·
Permanent magnet, 22 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · terminal
wire, 26 · · · electrode terminals, 41 · · · permanent magnet 42: Plastic member, 43: Electrode
terminal.
DETAILED DESCRIPTION OF THE INVENTION The present invention is the structure of an
electrodynamic speaker KIG + book 1-. Eight y 6 i y 3 'f' 78 108 1 Mainly easy to thin and small
II fixtures such as card calculators and electronics-meters! The purpose is to provide a thin
electrodynamic Spy-force that can be inserted. As is well known, an electrodynamic speaker has a
structure as shown in FIG. FIK1 and includes a magnetic circuit composed of a yoke 2, a
permanent magnet 5 and a plate 4, a voice coil 5, a diaphragm 6 and a damper. 7 and frame 8
are composed. The force acting on the peristaltic plate increases in proportion to the magnetic
flux dense TRKtt existing between the center port bird and the plate with the voice coil inserted.
As a result, it is possible to obtain a huge sound pressure which is determined by a magnetic
circuit including a permanent foundation stone and which has a large volume of permanent
magnet. However, today, the size of devices requiring a speaker (for example, radio, tape
recorder) is extremely small, and accordingly, electrodynamic speakers to be picked up are also
required to be thin and thin. ↑ Only by scaling down the speaker with the structure shown in
Fig. 1, the sound pressure decreases with the reduction of the magnetic circuit. The structure
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shown in FIG. 2 has been proposed as an electrodynamic speaker meeting the requirements for
such a small size and thin structure. This is a large umbrella as much as possible to the magnetic
circuit <The turtle, so the KII moving plate 25 is dispensed between the permanent magnet 21
and the yoke 22 in the shape of a circular rod, and the die coil A24 is attached to the magnetic
gear tube of the permanent magnet and the yoke. Structure for dispensing] i1. The permanent
magnet is radially magnetized in a direction parallel to the diaphragm and in a radial direction,
and a die coil Kt + is generated to generate a m-direction KWj bundle. According to this *
construction, since the magnetic circuit is the same as the external shape of the speaker, it is
possible to constitute a sufficiently large magnetic circuit even if the speaker is miniaturized and
thinned. Therefore, since the volume of the permanent-stone is large and large, the magnetic flux
density of the magnetic gap is also large, and the sound pressure can be increased. Therefore, the
speaker with the structure shown in KIE 2 is optimum for small and thin KFi. However, in the
speaker structure having such an advantage, the method 1 has not been proposed for the
processing 1 of the terminal line of the voice coil. The present invention proposes a method for
processing a voice coil terminal wire of an electrodynamic speaker having the structure shown in
FIG. 2, and its 5-Herd-4, t10831. Practical application of the Ijlt-no 'O speaker is made possible.
FIG. 3 shows an embodiment of the present invention, in which an electrode terminal 26 to
which a terminal wire 25 of a voice coil 24 is connected is fixed to an outer surface of a
permanent magnet 21 by bonding M. The other structure is the same as that of Building 2. The
contact terminal 26 Fi has a donut shape substantially similar to the outer surface m shape of the
permanent ginseng 210 and is bonded so as to cover the magnet surface. Therefore, the surface
of the foundation stone is hardly exposed to the outside, and the surface of the stone is not
scraped by an external force, and even if the magnet breaks, the magnet is dropped because it is
attached to the electrode terminal Kl1. Therefore, if the K11 1 pole terminal is formed as shown
in FIG. 3 so that the speaker does not deteriorate * a, the speaker performance deterioration due
to the scraping or turning of the permanent magnet can be prevented. In the case where the
permanent magnet 21 is a defective conductor or a nonconductor, as shown in the embodiment
of FIG. * [I may be determined, but if the permanent foundation is a good conductor or a
conductor, electrical problems such as 4- 榔 J,. In the illustrated embodiment, a plastic member
42 of poor conductor or nonconductor is wound on the surface of the permanent magnet 410,
which is a good conductor, and the electric terminal 43 may be fixed on the upper surface
thereof. The plastic member is bonded to the permanent magnet, and the electrode terminal is
fixed to the plastic member by bonding or heat caulking. By installing the electrode terminal on
the surface of the radially magnetized permanent magnet as in the invention, it is possible to
commercialize a small-sized and thin electrodynamic loudspeaker without performance
deterioration of the permanent magnet. The significance of is extremely large.
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