close

Вход

Забыли?

вход по аккаунту

?

JPS51128518

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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 JPS51128518
庁 庁 17, 17. :, 1 name (ci 27) representative of Onkyo Co., Ltd. Tani 5 generation Takeshi Onkyo
Co., Ltd. in the stock corporation 5, sot t! List of species ■ Japan Patent Office-○ JP 5112851.80 Published Japan. (1976) 11.9 Request for examination not yet filed (all three pages)
Office serial number / phantom thousand / The name of the specification 1 invention
スピーカー
3. Detailed Description of the Invention The present invention relates to the structure of a
speaker for the purpose of improving efficiency and linearity. The structure of the speaker is
mainly composed of a magnetic circuit, a voice coil and a diaphragm as shown in FIG. The
magnetic circuit has a center pole 1. マグネット2 フロントプレート3. A magnetic gap 5 is
formed between the center pole 1 and the front plate 3 by the back plate 4 so that a magnetic
field as strong as possible is generated in the magnetic gap. A voice coil 7 wound around a voice
coil bobbin 6 is disposed in the magnetic gap 5 and supported by a damper 8 so that the voice
coil is properly positioned at the center of the magnetic gap. Also, a diaphragm 9 is fixed to one
end of the indicating coil bobbin 6. In such a configuration, when an alternating current flows
through the voice coil 7, the voice coil receives a force by the action of the magnetic field and the
current, and the magnitude F of the force is the magnetic flux density B of the magnetic gap 5
and the total length l of the voice coil 7 and It is proportional to the magnitude of the current,
and is represented by p == 13- /. However, since the magnetic flux density in the magnetic gap 5
decreases as it approaches the end, FEndPage: 1 is the magnitude of the current when the voice
coil 7 approaches the end of the magnetic gap 5 at the time of large amplitude vibration. It
radiates the sound of a waveform which is not proportional to the waveform of the current I,
which is significantly different from the waveform of the current I, and the linearity is
significantly degraded. In order to solve such a problem, conventionally, a long voice coil in
08-05-2019
1
which a long wire is attached in the axial direction shown in FIG. 2 or a short voice coil shown in
FIG. 3 has been devised. The long voice film shown in FIG. 2 is obtained by setting the winding
width Tv of the voice coil larger than the width TP (the width of the magnetic gap) of the plate
3.degree. When the voice coil is used in this manner, even if the voice coil vibrates up and down,
a part of the voice coil is always positioned at the uniform portion of the magnetic flux of the
magnetic gap. That is, since the number of magnetic fluxes cut between upper and lower
vibration cycles is always constant, it is possible to obtain a vibration waveform proportional to
the current waveform. Also, the voice coil shown in FIG. 3 has a smaller winding width Tv of the
voice coil than the width Tp (width of the magnetic gap) of the plate 3 and does not deviate from
the voice coil or magnetic gap even when the voice coil is vibrating. In the same way, it is made
to operate within the range of uniform magnetic flux density. That is, since the number of
magnetic fluxes cut between the vertical vibration and the cycle is always constant, it is possible
to obtain an oscillatory wave type proportional to the current waveform. However, the speaker of
such a structure has a good linearity, but the magnetic efficiency is significantly reduced.
In the case of the long voice coil shown in FIG. 2, if the nominal impedance is constant, the
effective magnetic efficiency is lowered because the coil portion not linked with the magnetic flux
is much. In the case of the short voice coil shown in FIG. 3, the magnetic efficiency similarly
decreases because there is much magnetic flux not linked to the voice coil. As described above, in
a magnetic circuit limited in size and price, linearity and magnetic efficiency are contradictory
factors, and although emphasis is placed on one another, it is usually determined by the purpose
of use of the speaker. The The present invention improves linearity without lowering the
magnetic efficiency by using a long voice coil and inputting an electrical signal only to a portion
located in the magnetic gap of the long voice coil using a photoelectric conversion element.
Speaker. The embodiment of the invention will now be described with reference to FIGS. 4 and 5.
In the figure, 418 and 41b are conductive bands provided in parallel in the axial direction of the
voice coil bobbin. (1) A voice coil 42 of one turn is formed between the conductive band 41a and
a photoelectric switch element such as a cds or a photo-transistor, and the other end of the voice
coil 42 is connected to the conductive band 41b. Such a one-turn voice coil is axially aligned to
make its width greater than the width of the magnetic gap 7. The conductive bands 41a and 41b
are connected to the input terminal 43a and 43b, respectively. On the other hand, a concave
portion 45 is formed in the portion of the plate 3 facing the photoelectric switch elements 4 'and
2a, and it is conductive only when it is inside, so it is disposed in the portion where the light of
the light source 44 is incident, that is, in the magnetic gap 7'. A signal is supplied from the
conductive band 41a to the coil of only the portion that has been cut. Therefore, even when the
voice coil vibrates, the width of the voice coil 42 is set so as to be positioned in the magnetic gap
7 without fail, so that the voice coil 42 is positioned in the magnetic gap 7 having a constant
magnetic density. Driving force is obtained by the voice coil portion, and a vibration waveform
proportional to the input signal 'waveform can be obtained. As described above, the speaker of
the present invention uses a long voice coil whose winding width is larger than the magnetic gap
08-05-2019
2
width, and the photoelectric switch element is used to input the input signal only to the portion
located in the magnetic gap of the voice coil. By applying B, J as much as possible to prevent a
decrease in efficiency and to obtain a driving force in a magnetic gap with uniform magnetic flux
density, the conversion coefficient B is constant. And have the advantage of being able to be
made very good.
4. Brief description of the drawings. FIG. 1 is a sectional view of a speaker, FIG. 2 is a sectional
view of a long EndPage: 2 voice coil, FIG. 3 is a sectional view of a short voice coil, and FIG. FIG. 5
is a perspective view of a coil, and FIG. 5 is a cross-sectional view of a magnetic gap of the
speaker of the present invention. ''! 61よ、イア、つイア0,7.4□8ツ。 4 □, a conductive
band, 42a a photoelectric switching element, 42 a voice coil, 3 a plate, 45 a concave portion, 44
a light source, and 7 a magnetic gap. Temple (■ age? (Sword 31: 43 years-fi 5 Figure EndPage:
3
08-05-2019
3
Документ
Категория
Без категории
Просмотров
0
Размер файла
11 Кб
Теги
jps51128518
1/--страниц
Пожаловаться на содержимое документа