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JPS6043999

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DESCRIPTION JPS6043999
[0001]
TECHNICAL FIELD The present invention relates to a speaker for small-sized audio equipment
such as radio and radio cassette tape recorders. 2. Description of the Related Art In recent years,
compact audio devices such as radios and cassette tape recorders with radios have been
requested to be compact. However, one of the factors that harms such compactification is 1111.
The shape of the speaker can be mentioned, but the current speakers are electrodynamic
speakers composed of a cone-shaped diaphragm and a magnetic circuit, and are the most
common set components. It has become one of the big ones. For this reason, an electromagnetic
unit is taken over by a part of cabinets which comprise sets, such as a radio, and it is cabinetine!
? The reproduction method which uses ? as a diaphragm is considered ft. Hereinafter, the
conventional speaker as described above will be described. FIG. 1 UL shows a cross-sectional
view of a conventional electromagnetic speaker. In FIG. 1, 1 is an exciting coil wound around a
center pole 1 integrally or integrally connected to a plate 2, or 4 a ring-shaped magnenode
disposed on the plate 2, 5 The vibrating plate is made of a ferromagnetic material such as iron
and the like, and the periphery thereof is supported by a nonmagnetic material supporting
member 6 fixed on the plate 2. As described above, center pole 1 ░ plate 2. Excitation coil 3.
Magne ,,, 4), diaphragm 5. The electromagnetic unit consisting of the support 6 is firmly coupled
to a part of the cabinet 7 constituting the set via a spacer 8 provided on the diaphragm 5. The
operation of the conventional electromagnetic speaker configured as described above will be
described below. In response to the change in current flowing through the exciting coil 3, the
magnetic force acting on the diaphragm 5 changes, and the diaphragm 5 vibrates due to the
magnetic force VC. The vibration of the diaphragm 5 is transmitted to the gear vignette 7 via the
spacer 8 provided on the upper part thereof. The gear vignette 7 constituting the outer shape of
the set has a large vibration area, and can efficiently convert the vibration from the diaphragm 5
into an acoustic output. As described above, in the conventional electromagnetic speaker, the
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electromagnetic unit is attached to a part of the cabinet 1 of the set, and the vibration of the
cabinet 1 or 7 is intended to be reproduced by this electromagnetic unit. In the conventional
configuration, since the periphery of the vibration '4Fi 5 is identified and supported by the
support 6 in the conventional configuration, the resonance circumference ? of the diaphragm 5
becomes several caustic 5 and reproduction of the bass region is difficult 1 Furthermore, since
the spacer 8 is required for the diaphragm 5 to drive the cabinet 7, the overall height becomes
high and thinning (tC-has a drawback that there is a limit).
OBJECTS OF THE INVENTION In view of the conventional defect, it has been made in view of the
conventional problems, and it is necessary to use an electromagnetic speaker IJ7 which reduces
the frequency and facilitates the reproduction of the low frequency range + 1C and reduces the
thickness easily. With the goal. According to the invention, the electromagnetic speaker of the
present invention has a center pole provided by winding an exciting coil around a pole, and a
magnet + c provided on the outer side of the exciting coil. And an integrally-formed support
made of a spring rod having elasticity between the plate and the diaphragm. This configuration
lowers the resonance frequency and eliminates the need for a spacer between the diaphragm and
the node so that direct coupling is possible. DESCRIPTION OF THE PREFERRED EMBODIMENT
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 2 (a) is a front view of the electromagnetic speaker according to the first embodiment of the
present invention, and FIG. 2 (+)) is a concave surface view. In FIGS. 2 (a) and 2 (b), the same
parts as in FIG. In FIGS. 2 (a), 2 (b), 9 is a diaphragm fixed to the gear wheel node 7 of a cent
such as a radio, and the diaphragm 9 and the play 1 и 10 are larger than the outer diameter of
the ring shaped magnet 4. A plate-shaped support 11 integrally formed between the diaphragm
9 and the play MO is provided on one evening of the mat 4. The support 11 is made of an elastic
spring material such as phosphor bronze or stainless steel, and its shape is the diaphragm 9. A
plate-like, circular shape along the outer shape of the plate 1 o, and the diaphragm 9. The upper
and lower surfaces in contact with the plate 10 are alternately formed so as to maintain an
inclination between the flat portions. FIG. 3 is a cross-sectional view of the same part, showing a
coupled state between the plate 10 and the support 11. A flat portion 13 having a hole 12 is
provided in the support 11 at the contact wedge between the support 11 and the plate 1o, and a
pin 14 for inserting the hole 12 is provided on the contact surface on the plate 10 side. The
support 11 and the plate 10 are coupled. In the same manner, the diaphragm 9 and the support
11 are also coupled in place of the plate 1o. This is a possible coupling method in which an
attractive force always acts between the diaphragm and the magnetic circuit in the
electromagnetic speaker. Therefore, the contact surface between the flat portion 13 and the
diaphragm 9 or the plate 10 may or may not be adhesively fixed. Alternatively, the pin 9 may not
be provided on the diaphragm 9 or the plate 10, and the flat portion 13 may be bonded and fixed
directly. The operation of the present embodiment configured as described above will be
described below.
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Since the diaphragm 9 is supported by the support 11 provided between it and the plate 10, the
diaphragm 9 is directly fixed to a part of the cabinet 7 of the set without requiring a bonding
material such as a spacer. be able to. The vibration of the vibrating diaphragm 9 is directly
transmitted to the gear wheel node 7, and acoustic reproduction can be realized in response to
the electrical input of the exciting coil 3 иии. As described above, according to the first
embodiment, since the diaphragm 9 is supported by the support 11 made of springy material,
the pie и constant can be set arbitrarily by changing the spring material, etc. It is possible to
reduce the resonance frequency of the speaker, and to attach the diaphragm 9 directly to the
gear 7 and to make it possible to thin the cent including the cabinet 7. is there. What's wrong? J
A second embodiment of the present invention will be described with reference to the drawings.
FIG. 4 is a main view of an electromagnetic speaker according to a second embodiment of the
present invention, and FIG. 4 (b) is a front view thereof. In FIGS. 4 (a) and 4 (b), the same
members as those in FIGS. 2 (a) and 2 (b) and FIG. In FIG. 4 (a) and ('o), 15 is a support provided
between the plate 16 and the diaphragm 9' and on the outer periphery of the exciting coil 3, 17
is a magnet provided on the outer periphery of the support 16. It is. The connection of the
scooped diaphragm 9 ', the plate 16 and the support 15 is carried out by the same method as the
first embodiment as shown in FIG. The operation of the second embodiment configured as
follows will be described. Since the diaphragm 9 'is mounted on the diaphragm 9' and supported
by the support 16 between the plate 16 and the diaphragm 16, the diaphragm 9 'is not required
to be joined to the joint side of the spacer 9'. It can be fixed directly to gB. The vibration of the
vibrating diaphragm 9 'is directly transmitted to the gear wheel and the node 7, and response to
the electric input of the exciting coil 3 иии can realize acoustic reproduction. Furthermore, the
outer diameter of the electromagnetic unit can be made much smaller by providing the support
15 in the inside of the magnode 17. In addition, the first one. In the second embodiment, the
'electromagnetic type unit is fixed to a part of the cabinet of a radio, radio unit, Kastian tape
recorder to reproduce sound, and 7' c vibrates furniture such as a door or desk. It may be used as
a drive part of a speaker based on a plane -C. FIG. 5 (a) shows the results of FIG. FIG. 5 (b) is a
front view of a main body of a support having a spring portion used in the second embodiment.
In FIGS. 5 (a) and 5 (b), the ring-shaped support 18 has a plurality of arc-shaped slits 19 formed
inside along the outer periphery thereof, and one end thereof is further provided with a slit 20
toward the outer periphery. The root portion 21 integrally forms a spring portion 22 which is
separated into an arc-like slope at the end edge. The tip of the pie portion 22 is provided with a
flat portion 23 parallel to the bottom surface of the support 18, and from the root portion 21 of
the spring portion 22 a shape 17 provided with a slope and the flat portion 23 on the lower
surface of the diaphragm The support 21 is fixed to the upper surface of the plate. It may be
used for the support of the second embodiment. As described below, according to the
electromagnetic speaker of the present invention, the following effects can be obtained. (A) The
pi and constant can be set arbitrarily by changing the spring material of the support and the like,
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and the resonance frequency of the diaphragm can be lowered to facilitate the reproduction of
the bass region. (I: I) Since the diaphragm can be attached to the li ? ? J contact gear joint, it is
possible to easily realize the thinning of the cent including the gear joint, without the need for a
combination body such as a spacer. I can do it.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a conventional electromagnetic speaker, FIG. 2 (a) is a stop of
the electromagnetic speaker according to the first embodiment of the present invention [m FIG. 2
(b) is a perspective view of FIG. 3 is a cross-sectional view of the main part, FIG. 4 (a) is a main
view of an electromagnetic speaker according to a second embodiment of the present invention,
FIG. 4 (b) is a front view, FIG. 6 (a) ) Ri: A main surface view of a support having a pie portion,
and FIG. 5 (b) is a plan view of a support.
1-.-Center pole L, 3- 3- excitation coil, 4- magnet, 9-- diaphragm, 10-- plate 11. Name of Agent
Attorney Nakao Toshio Other 1 person Figure 1 Figure 3 Figure 4 ((L) / ???
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