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JPH09200892

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH09200892
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in audio equipment.
[0002]
2. Description of the Related Art The prior art will be described with reference to FIGS. First, a
speaker having a low-leakage type magnetic field part of magnetic flux will be described with
reference to FIGS. 4 to 5. According to the drawing, reference numeral 1 denotes a main magnet,
which is sandwiched by the upper plate 2 and the lower plate 3.
[0003]
In order to reduce the leakage flux of the main magnetic circuit formed by the main magnet 1,
the upper plate 2 and the lower plate 3, the magnet 4 is magnetized in the opposite direction to
the main magnet 1 and attached to the lower portion of the lower plate 3. The field magnet unit
1 a is composed of the main magnetic circuit unit and the cancel magnet 4.
[0004]
Reference numeral 5 denotes a shield cover that accommodates the field portion 1a, and
effectively utilizes the magnetic flux of the cancel magnet 4 to improve the magnetic energy of
the field portion 1a, and leaks to the outside of the field portion 1a. It reduces the magnetic flux.
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[0005]
A frame 6 is coupled onto the upper plate 2 of the field portion 1a, and the peripheral portion of
the diaphragm 8 is fixed to the peripheral portion of the frame 6 together with the gasket 7, and
the field portion 1a is formed at the central portion of the diaphragm 8 The voice coil 9 which is
embedded in the magnetic gap is coupled, the middle part of the voice coil 9 is held by the
damper 10, and the dust cap 11 is stuck on the upper surface of the central part of the
diaphragm 8 to make a speaker.
[0006]
However, in the above configuration, since the outer lower surface of the shield cover 5 is
substantially smooth, the markings 12 such as the product number and the manufacturing
number do not come in contact with the packaging material and disappear. It had the subject of
being hard to visually recognize.
[0007]
In the past, as a means for solving this problem, the seal indication 12 was provided on the
recess 13 for positioning of the cancel magnet 4 of the shield cover 5 shown in FIG. It had
problems such as time-consuming.
[0008]
Moreover, although the convex part 14 is provided in the outer periphery of the lower surface of
the shield cover 5 like FIG. 6-FIG. 7 and the flat part in this annular convex part 14 is marked and
displayed, generally the shield cover 5 is an aperture. Since it is formed by processing, it is
necessary to process the convex portion 14 in the die for drawing processing, which increases
the cost of the die, and also has a problem that the convex portion 14 is easily broken at the time
of drawing.
[0009]
In the field portion 1a constituted by the main plate 1 and the upper plate 2 and the lower plate
3 for sandwiching the main magnet 1 of the conventional speaker which is not the low leakage
type described in FIGS. In the lower surface of the case, the seal display similar to that of the
above-mentioned low leakage speaker has a problem that it is likely to be in contact with the
packaging material at the time of packaging and easily disappear and to be difficult to view.
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[0010]
The present invention solves the above-mentioned problems, and provides a speaker having a
seal display that is hard to disappear.
[0011]
[Means for Solving the Problems] In order to solve the above-mentioned problems, the speaker of
the present invention is provided with minute asperities on the mark display portion on the lower
surface of the shield cover.
[0012]
According to the above configuration, the marking ink enters the concave portion of the uneven
portion, and the convex portion prevents contact with the other, thereby preventing the marking
display from disappearing.
[0013]
The invention according to claim 1 of the present invention comprises at least a magnet, upper
and lower plates disposed to sandwich the magnet, and a cancel magnet attached to the lower
portion of the lower plate. A shield cover provided with a magnetic field portion comprising the
magnetic field portion, a minute uneven portion for giving a seal indication on the outer lower
surface for housing the field portion, a diaphragm incorporated in a frame coupled to the field
portion, and Since the voice coil is connected to the diaphragm and embedded in the magnetic
gap of the field section, the marking ink enters the concave section of the uneven section and the
convex section prevents contact with the other, and the marking is displayed. It is something that
can be prevented from disappearing.
[0014]
The invention according to claim 2 is a minute uneven portion for marking the lower surface of
the lower plate of the field portion constituted of at least the magnet and the upper and lower
plates arranged to sandwich the magnet. As a result, the marking ink enters the concave portion
of the uneven portion, and the convex portion can prevent contact with the other to prevent the
marking from disappearing.
[0015]
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to
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3.
In the description, the same parts as in the prior art are given the same reference numerals, and
the description thereof is omitted, and only the characteristic parts are shown and described.
[0016]
(First Embodiment) FIG. 1 is a side sectional view of a shield cover which is an essential part of a
speaker according to an embodiment of the present invention, FIG. 2 is a bottom view as seen
from below, and FIG. It is a partial expanded side view of the undersurface which turned up.
[0017]
As shown in the figure, reference numeral 5 is a shield cover, and 15 is a textured surface of a
minute concavo-convex shape provided on a flat portion of the outer lower surface of the shield
cover 5, which serves as a marking area.
In addition, 12 has shown seal ¦ sticker display.
[0018]
The embossed surface 15 is embossed on the surface of the shield cover 5 with a concavo-convex
shape on a part of the mold of the shield cover 5, and the embossed surface 15 of the micro
uneven shape on the corresponding flat portion of the outer lower surface of the shield cover 5.
Form the
[0019]
As described above, by marking the small uneven portion on the outer lower surface of the shield
cover 5 which is the marking display portion, the sealing ink is made to enter the concave
portion and the rubbing of the packaging material etc. directly with the marking display is
prevented. It prevents the seal from disappearing.
[0020]
Second Embodiment Although not particularly shown in the second embodiment, a minute
uneven portion is provided on the lower surface of the lower plate 3 in the prior art of FIGS. In
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the case where the lower plate 3 is manufactured by forging, mass production can be carried out
extremely easily by subjecting the corresponding portion of the forging die to embossing
processing of the concavo-convex shape, and the same effect as in the first embodiment can be
obtained. It is a thing.
[0021]
As described above, in the speaker according to the present invention, the minute convex and
concave portions are provided on the seal indication portion on the lower surface of the shield
cover, and the sealing ink having the seal indication is inserted into the concave portions of the
uneven portion. The present invention provides a speaker in which the seal display is prevented
from disappearing by preventing contact with another.
[0022]
Brief description of the drawings
[0023]
1 is a side sectional view of a shield cover which is an essential part of a speaker according to an
embodiment of the present invention.
[0024]
Figure 2 Bottom view seen from below
[0025]
Fig. 3 Partially enlarged side view of the lower surface with the lower surface up
[0026]
Fig. 4 A side sectional view of a conventional low leakage type speaker
[0027]
Fig. 5 Bottom view of the same field viewed from below
[0028]
Fig. 6 Side sectional view of another shield cover which is the same as the essential part
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[0029]
Figure 7 Bottom view seen from below
[0030]
Fig. 8 A side sectional view of a field section which is an essential part of a conventional speaker
[0031]
Fig. 9 The bottom view seen from below
[0032]
Explanation of sign
[0033]
DESCRIPTION OF SYMBOLS 1 Main magnet 1a Field part 2 Upper plate 3 Lower plate 4 Cancel
magnet 5 Shield cover 6 Frame 8 Diaphragm 9 Voice coil 15 Textured surface of uneven shape
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