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Patent Office Director Yukio Miyake 1, Title of Invention 2, Inventor 6, Patent Applicant 4, Agent
■ Japan Patent Office ■ JP-A-49-102324 [Fa] Published Japanese Patent No. 49. (1974) 92 "t"
■ Japanese Patent Application No. 4g-II and 4 '/ ■ Application BEf & J', (197,? ) / J / Request
for examination not yet issued (4 pages in all) Description 簀 1, title of the invention] 1, title of
the invention] speaker device
Speaker device
The present invention relates to a speaker device for motional feed back (qll <MFB) using a Hall
element as a detection element. Heretofore, the MFES system is known as a writing system which
reduces the distortion of an audio signal including a speaker in the front of an audio device to
reduce the distortion of an audio signal and which is faithful to the human power No. 1g. This is
to separate the voice detection coil from the voice coil separately from the voice coil on the coil
hobin connected to the cone-shaped vibrating body of the speaker to avoid mutual interference
in one row of the whiss coil to avoid such mutual interference. And when the motor is driven by
applying an electrical signal to the voice coil, the detection coil is induced with the drive
EndPage: 1 The electric signal is taken out, and this signal is negatively fed back to the amplifier
in front of the speaker through the compensation circuit or amplifier. However, because the
conventional loudspeaker that helps is wound on the coil bobbin in relation to winding the whiss
coil and the detection coil, the dimensions and shape of the bobbin are required to be voluntarily
large, and the loudspeaker has to be large and valued. However, it may be possible to wind the
detection coil of the F9Iy, but in this case the sound pressure level of the speaker may decrease
or the production may become complicated. The present invention has been conceived on the
basis of the above-mentioned drawbacks, in which only the voice coil is wound on the bobbin,
and instead of the detection coil, the Hall element is disposed in the magnetic space in front of
the central magnetic pole portion. The generated voltage of the Hall element is compounded
based on the drive of the coil, and the generated voltage thus obtained is applied to the input side
of the amplifier on the front stage of the speaker to compensate the compensating circuit or the
stage. It is something which is made to return. The present invention will be described below
based on examples. In the figure, (1) is a magnet, (2) is a central a-pole part, and (3) is a yoke
formed by a magnetic & part (4) having an annular ridge. In this case, the central magnetic pole
part (2) is an S pole, and the broken magnetic pole part (4) is N misery. Between the central
magnetic pole part (2) and the lozenge magnetic pole part (4), the magnetic nitrogen 1! J (5) is
annularly formed. (6) Hachorihobin, to which the Heus coil (7) is dedicated, the leads m of this
coil being glued to the terminals (not shown) provided on the frame in a known manner. The coil
bobbin (6) has one end supported by the cone spinner moving body (8i and tan-<-t91 so that the
coil S (7) is present in the above-mentioned magnetic gap (5), and the magnetic gap (5 ) Is freely
inserted into the drive.
1101 is a Hall element, and the magnetic pole portion 12. It is attached by N-casting on the
document body uIJ so that the magnetic field lines of lt April i pass well. 靜 6 self-hole elements
are generally used, and one example of the dimensions is a 5 × 5 × 2 w rectangular solid and
extremely ring-shaped semiconductor with a current terminal and a voltage terminal. Each of
these terminals is coupled to the respective terminals provided on the frame by leads similar to
the case of the above-described whiss coil. The end member αυ is made of a nonmagnetic
material such as a tube or sleeve similar to the coil bobbin and is attached to the bobbin in front
of the central magnetic pole portion (2). The hall element shouting and supporting member 1 can
be covered with a cap so as not to be seen from the front of the speaker. 〔2はフレ7ムである。
In FIG. 2, u is a bud-dio amplifier, 041 is an input signal terminal, <151 is a current source for
energizing the Hall element, and a scream is a Hall element (1010 generation w, the feedback
amount of the tail is It is a compensation circuit or amplification 6 to adjust. The spee jj device of
the present invention is configured as described above, and the 70 'operation will be described
next. The input signal applied to the terminal I is amplified by the amplifier u5 and supplied to
the Heus coil (7) . However, the voice coil is converted into a speech signal by means of a full
cone-like oscillator in the air gap (5) in accordance with the above-mentioned sign. In this
condition, the Hall element cries with the voice coil (7) to move integrally and generate a voltage
according to the change of the magnetic field. EndPage of such generated voltage: Because it
differs depending on the size, frequency or the structure of the speaker of the signal applied to
the two-magnitude-poise coil, this generated voltage is adjusted by adjusting the feedback
component and amount via the compensation circuit or amplifier. If one or more buttons of the
amplifier in front of the speaker are supplied as a button, the signal distortion of the entire
amplification system including the speaker can be reduced and the sound reproduction faithful to
the original sound can be obtained over a wide frequency band. In the invention, the Hall element
α 一体 is integrally mounted on the bobbin (6) in the front magnetic space j of the central
magnetic pole portion (2) of the speaker via the support member 0υ, and the generated voltage
of such Hall element is used to drive the voice coil. Because the speaker device is designed to be
changed and deposited based on the above, the speaker itself does not become large, and
furthermore, the manufacture can be extremely easy and inexpensive, and Since an element has
advantages such as long service life without seconds pole portions different from the coil or the
like (2) (in contact with the 41 or break it and generate noise.
4. Brief description of the drawings] FIG. 1 is a side longitudinal cross-sectional view of the
speaker apparatus according to the present invention, and FIG. 2 is a main part system of the
amplification system in the audio apparatus for explaining the operation of the speaker
apparatus according to the present invention. FIG. 1, magnet 11: support member 2: central
magnetic pole 12: frame 6: yoke 13: amplifier 4 JJI-like magnetic pole 14: input terminal 5:
magnetic gap 15: current source 6: bobbin 16: Compensation circuit to amplifier 7: Voice coil 8:
Cone 9: Damper 10: Hall element. Attorney Attorney Yuasa Kotoyu Attorney Attorney Attorney
Kohei Ikenaga Attorney Attorney Attorney 1) Michio EndPage: 35, List of attached documents (1)
One letter of attorney (following supplement) (2) One statement (3) 1 drawing (2) Agent-Address,
2nd District, Otemachi, Chiyoda-ku, Tokyo No. 206 New Otemachi Building Room Name (6355)
Patent Attorney Ikenaga Kotobuki Address Address Name (6196) Patent Lawyer Stone-Michio
Tadashi, EndPage: 4