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Patented officer Hideo Saito 1, name of invention speaker ? Japan Patent Office ? JP 50129213 [Phase] filing date Japan acid, F, (197 ?) 4. / Request for examination (all 5 pages)
Office internal reference number 64 ? ?? ?? 1, ?? ?? 1 ? ?? ? ? ? ? ? ? ? ?
Telephone Tokyo 352-1561 (fee)
6. Detailed Description of the Invention The present invention relates to an electrodynamic
speaker having a magnetic flux distribution symmetrical to the displacement direction of a
vibration system. As is well known, in an electrodynamic speaker, an annular magnetic gap is
formed by the center ball and the mic plate by a magnet. And, in the above-mentioned magnetic
gap, the magnetic flux distribution is different in the urban area inside and outside the gap. That
is, since the magnetic flux runs in a loop in the closed magnetic circuit, as shown in FIG. 6, the
magnetic flux density at the magnetic gap is large inside the loop magnetic path and small
outside. Because this-, this magnetism W, the voice coil which is started by the furnace, causes
the vibration which has distortion component-, 1. As a result, the induced sound pressure
inevitably has distortion. ?? Here, the present invention aims to prevent the occurrence of the
conventional distortion by making the magnetic flux distribution symmetrical with respect to the
displacement direction of the voice coil for raising the driving force of the vibration system. .
EndPage: 1, as already described, as long as the magnetic path is closed-the flux density of the
looped magnetic flux necessarily shows differences at the inner and outer positions. Therefore, in
the present invention, in the magnetic circuit centering on the magnet, the magnetic gap is
formed symmetrically with respect to the magnetite. Therefore, in the present invention,
although the magnetic flux band of each magnetic gap is asymmetrical, the total magnetic flux
due to both magnetic gaps is symmetrical with respect to the displacement of the voice coil. The
present invention will be specifically described below based on an embodiment shown in the
drawings. In FIG. 1, for example, two ring-shaped play) + 41 + 51 is fixed to the top of the
electrodynamic speaker (1) and frame (2) while holding the ring-shaped ferrite magnet (3).
Center balls (6) are vertically symmetrically positioned in their central holes, and magnetic gaps
+ 71 + 81 are formed between the sensor tar "-(6)-and two plays) + 41 + 5 +-. The center ball (6)
described above is disposed in a floating state with respect to both plates (4) (5), and because it
is necessary to obtain a symmetrical magnetic field, the support made of nonmagnetic material
such as synthetic resin Support in (9). Also, it is preferable to use a nonmagnetic material for the
frame (2) to obtain a symmetrical magnetic field in the magnetic circuit. 'And, both the abovementioned magnetic gaps (71 + 81 K, bobbin 00 in a state of being inserted into the center ball
(6)) are disposed. This bobbin 00 (may be held by one damper (11: J if possible, but may be
supported by the same damper u 21 in a line-symmetrical position).
A magnetic gap +71 (a voice coil 03a4 for supplying an audio current at a position 81) is wound
around the bobbin rod. ???????????? u41 sets the line type and the number of
turns under the same condition in order to generate the same action force. Also, both voice coils
031 + 14) are normally wound in opposite directions to produce an action in the same direction.
However, if, for example, the directions of the currents are connected to be opposite to each
other, both voice coils f131141 may be wound in the same direction. Note that both voice coils
f131 (141 are parallel to the signal input end, or ff1i! May be connected in a row. Furthermore, a
cone (151 is supported as a diaphragm so as to be capable of vibrating freely, and a cap QIA is
attached to the cone tapping if necessary, as a diaphragm at the end of the coil bobbin (1? and
the opening edge of the frame (2)). Now, in the magnetic gap (7) (81) to be a magnetic circuit by
the magnet (3), a magnetic field in the opposite direction is generated. The two magnetic fields
are constructed and positioned in line symmetry with the center position of the play (4+ (51 and
ball (6) cam magnet (3) as the axis of symmetry, so the direction of the magnetic flux is different,
It has the same magnetic flux distribution. 9) Both magnetic gaps (71 + 8 + magnetic fields are
symmetrical magnetic fields. Therefore, when an audio current flows in both voice coils f131
(14), currents in opposite directions flow in both voice coils t13114 in response to the
symmetrical magnetic fields of both magnetic gears +7 and (8). Both voice coils +131 aj obtain an
activation force in the same direction, and cone 11 (151 is vibrated, 1b), and in this case, the
magnetic fluxes of both magnetic gaps (7) and (8) have different directions. However, since the
magnetic flux distribution such as EndPage illustrated in FIG. 3 is in an inverted relationship with
each other in the inverted magnetic flux distribution, the same distribution is shown, so both
voice coils activated by both magnetic fields! 1114) oscillates mutually compensating for
asymmetry of one magnetic flux distribution. Next, referring to FIG. 2, when looking at the
magnetic flux in the magnetic circuit, the driving force F is obtained by the magnetic flux Fai F '/
by the magnet (3) and the voice coils +131 (the reverse direction current Ia of 141 and IA. At this
time, the alternating current flux FL, FL transfer occurs respectively due to the voice coil ti3am
having a width wider than the thickness of 51.
The magnetic flux FLa + FLA is superimposed on the DC operating point of the magnet (3), and
from the change of the magnetic flux ?, voice, core, yl (1st (the distortion component is induced
in the current of 141, distortion occurs in the reproduced sound , Will mainly emit the second
harmonic. However, in the case of 7bi (7) (1) of the present invention, since the magnetic fluxes
FL and FL / r are generated in the opposite direction, they cancel each other and prevent the
occurrence of distortion. The two dampers 4]) 1121 are disposed symmetrically at the end of the
bobbin (10, so the coil f13! f14) prevent abnormal vibration of the bobbin (10) to which it is
applied, and mutually compensate for non-linearity of "elastic car displacement" with respect to
one damper. Although FIG. 4 exemplifies the relationship of displacement with respect to the
external force of one damper, in the case of two dampers, since this characteristic is in a
relationship of being inverted about the axis of displacement, external force-displacement. The
relationship of is symmetrical with respect to this external force. According to the present
invention, it has the following features. First of all, since the magnetic flux induced in the
magnetic circuit by the voice coil current is generated by both coils in the opposite direction to
each other and is mutually extinguished, distortion by this, mainly by the second harmonic etc.
The occurrence of distortion can be prevented. Second, since the magnetic gaps are provided
symmetrically, the asymmetry of the magnetic flux distribution in the magnetic gaps mutually
cancel each other, and reproduction and noise distortion due to the magnetic asymmetry can be
prevented. Sixth, as in the above embodiment, when the same shape dampers are installed
symmetrically, they have the function of mutually compensating for the non-linearity of the
displacement with respect to the external force. Distortion due to linearity can be reduced.
Assuming that the nominal impedance of one voice coil is 2 by a series or parallel 4I of two voice
coils in ? 4, each synthetic nominal Invidan field can be 22 or Z / 2 and the nominal impedance
of the speaker can be varied. it can. Furthermore, fifthly, there is a secondary effect that mutual
induction phenomenon occurs between both voice coils, and since they work in the negative
direction with each other, there is apparently an inductance reduction effect as compared to the
input of the speaker apparently.
4. Brief description of the drawings shows an embodiment of the present invention, FIG. 1 is a
sectional view of the speaker, FIG. 2 is a sectional view of the main part, and FIG. 6 is a plate with
a magnetic gap FIG. 4 is a graph showing the relationship between the external force EndPage of
the damper: 3 modes and 1 displacement. (1) иии Speaker, (3) и и Magnet, (4 + 151 и и и и (6) и ?
center pole, + 71 (8) и и и Magnetic gap, +1: IQ41 и и voice coil, Apr. 1, 1974 inventor Tokaibayashi
Koji patent applicant Coral Acoustics Co., Ltd.-'-5 agent Yuji Serizawa, Nia, 9: 2 2' 1, '-5 ? ?-[?
# Opening ff :: 5 o-12 c: 213 (4) A L-?-1 L5. List of attached documents (1) 1 small letter (2) 1
drawing (3) 1 letter of attorney (4) application form 1 duplicate (5) application examination
request 1 case, 6, agent other than the above (3 ) Agent Tokyo Shin-ku, Shinjuku 4 chome No. 3
22 (Ando Building) (? 160) 6 6276 Patent Attorneys Serizawa Ryo-, No ? 6366 Attorney
General ? ?, Two-EndPage: 4 procedures Amendment (Spontaneous) Showa Tsuru-New Year's
Eve-Mon 08 Japanese Patent Office Secretary Blue Alga Hideo 1 Showcase of the Case 'A 49
Patent Application, 1-36852 No. 2, Invention's Name Speaker 2, Invention's Name Speaker
Telephone Tokyo 352-1561 (fee)
5, the date of correction instruction no target of correction, column of the detailed description of
the invention in the specification. Details of the amendments As shown in the attached sheet. ? d
50 50 =-927 927 3 (5) With regard to this application, the specification is amended as follows. 1)
In the specification row 3 page line 6 to row 9 line, "O-------becomes. The magnetic gap is formed
symmetrically with respect to the magnet. In the present invention, the magnetic flux density of
each magnetic gap is asymmetrical in the present invention, but since the magnetic flux density
is in an inverted positional relationship, the total driving force in each voice coil is equal to any
displacement. It acts on, and becomes K. And correct. t statement, 1? 6 pages 13 lines K. There is
"corn paper (IS)," "corn (1! Correct with 19J. May 8, 1974-Patent Assignee Coral Acoustics Inc.
EndPage: ?
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