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1. Title of the Invention Speaker 0 Published Japanese Patent 51. (1976) 5.13 Local Office Serial
Number "(hand c 555 specification (i) l title of the invention l title of the invention speaker
■ JP-A-51-54425
3. Detailed Description of the Invention The present invention is an improvement Kg of a speaker
in which a sound wave is directly induced by a vibrating coil which combines a voice coil and a
diaphragm. Application incoming line, previously developed a new type of speaker nine. The
present invention is based on the technology of the new type of speaker as prior art. Therefore,
we will first outline the prior art. Fig. 1 shows a prior art loudspeaker system. In the same Spinika
frame, the magnetic gap (5) of the DC magnetic field is formed by the magnet 1), the top plate
(2), the yoke plate (3) and the center pole (4). A vibration coil '(6) as a plate is supported by a
damper (7) so as to be able to vibrate. The symbols (8) and (9) are an equalizer and a horn,
respectively. Now, when an audio current is supplied to the ringing coil (6), the ringing coil (6)
acts on the negative magnetic field of the magnetic gap (5) to vibrate EndPage: 1 to induce a
sound wave. By the way, in the above-mentioned speaker cage, only one mobile coil (6) acting as
a swing plate is used, the utilization factor of the magnetic gap (5) is low, the impedance rises in
the high region, and the high region There is a drawback that the response decreases. It was
necessary to apply a copper cap to this rounded center pole (4). The present invention has been
developed in view of such circumstances, and aims to improve the efficiency, to increase the
distortion-free maximum sound pressure, to correct the low range of distortion, and the invinidance. Hereinafter, the present invention will be specifically described based on each
embodiment. In the following description, the same parts as those of the prior art speaker are
denoted by the same reference numerals, and the description thereof is omitted unless necessary.
The speaker (B) in the embodiment shown in FIG. 2 is vibratably supported by the damper (7)
with the magnetic gap (the two vibrating coils (6, 62) facing the powder portion). . And the space
between the two vibration coils (6, 62) passes from the outer peripheral surface of the center
pole (4) to the outside of the yoke plate-(3) through the sound passage (10,) leading to D @ I am
connected. The cross-sectional shape of this passage (10,) and the opening lvi area at the outer
periphery of the center pole (4)! It shall be decided appropriately in consideration of the
acoustical load. Nao, tree (91 shall be attached if necessary. Next, in the speaker + B) in the
embodiment of the 3rd figure, the space between the two swing coils (6, 6) is the same as the
center pole (4) from the outer peripheral surface of the center S-le (4). It is connected to the
outside S by the passage (102) which opens to the "circle 1) poor" end face of 4).
Then, the top plate (2) K is provided with water (91). Further, in the embodiment shown in FIG. 14, the top plate (2) forms a radial passage (10,). The outer periphery of the top plate (2) 1. , 9-本
(9) are attached. In any of the embodiments shown in FIG. 2, FIG. 3 and FIG. 4, the sound path
(10,) (No) does not increase the magnetic resistance of the magnetic circuit. Shall be formed into
A plurality of passages (102) (10,) may be formed radially. The damper (7) is preferably airtight.
Now, the two video cameras, Il (6,) (6,) K, emit sounds so that the displacement directions are
opposite to each other. When the excitation coil (6, 62) in the form of a spiral coil is wound in the
same direction as the -QJ means, a current of reverse phase is flowed, and when winding is
different, the current of the same phase is passed. It will be K if it should flow. In this way, the LC
2 vibrating coils (6,) (6,) vibrate in opposite directions. As a result, the volume of the space
between the two vibration coils (6, 62) changes, and sound waves are emitted from the passage
(10,) (IO 2) Q os). At this time, the two vibrating coils (6, 6) generate magnetic fields in opposite
directions. And since the induction magnetic fields between them cancel each other, it is possible
to prevent the rise of the impedance of the vibrating coils (6, 62). In the present invention,
EndPage: 2, in which the swing for one folding coil is half when obtaining two identical 'one's in
order to put two cocoon coils in the same magnetic-air gap, because The reduction of distortion
at work, the reduction of the maximum sound pressure without distortion, and the acquisition of
the same moving area as that of a single moving coil can be shared by two moving coils, since the
area can be shared by two moving coils. Since the gap of the gap is a half valley, the magnetic
flux density is large, the magnetic efficiency is increased, and the high frequency response is
increased due to the decrease of the impedance increase in the high frequency region, and the
high frequency reproduction limit is increased. And flat frequency characteristics can be
BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a cross-sectional view 1 of a prior art
loudspeaker,? 2, 2 and 3 are cross-sectional views of respective embodiments of the loudspeaker
according to the present invention. · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Speakers
according to the present invention (5) · · · magnetic gap (6,) (62) aisle. Nov. 8, 1984 inventor
West 1) True-Mr. Takashi Muramura patent applicant Sansui Sankei Co., Ltd. Dojinawa Ryoji
Ichiban-UVZ "1 ': 芙-, 11EndPage: 35, List of accompanying documents (1 1) Description "1": ""
(2) Drawing 1 (6), inventor and agent other than the above (1) Inventor (Shinjuku-ku, Tokyo 4chome 3-2 So) (Ando Binori 10)- I-EndPage: 4
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