JPS51132807

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DESCRIPTION JPS51132807
Patent Office President 'Head Office Saito Hideo 7 Rigasu Dora Rangata 1, the title of the
invention 動 e797 ′ ′ /': j 'f' address (resident) 8 8 [phase] Japan of Ooka Shirataki, Numazu
City, Shizuoka Prefecture Patent Office ■ Japanese Patent Application Laid-Open No. 511328070 published Japanese Patent Application (1976) 11.18 Internal reference number 7 7 3
3 Specification 1 name of the invention electrodynamic type pickup 1 name of the invention
electrodynamic type pickup 2 special Wf W * range of request. (A coil body for IL charging is
fixed, and a vibrator attached to a cantilever does not move with a small air gap with respect to
the coil body to make the magnetic flux work hard, the coil body cuts the magnetic flux, and the
voice In an electrodynamic pickup for generating an electric current, a rhombic iron core is
wound in such a relationship that a 3'i-39.degree. 0 coil crosses each other at '74 .degree. An
electrodynamic pickup having a. An electrodynamic pickup having a vibrator in which an end
face of an imaging element is moved along a center line of a coil body from a center position to a
perpendicular direction in a dynamo type pickup of 2'l (1). 15 (3) (1) in the trI'1 city type 1
pickup, one end of the wire is fixed to the movement fulcrum of the image pickup movement, and
the other end is fixed to the holder on the needle tip side of the cantilever
· Patented patent applicant
Detailed Description of the Invention The coil body of the invention j # lightning armor is fixed,
and the magnetic flux is moved by moving the vibrator attached to the cantilever by 1 ° relative
to the coil body, An object of the present invention is to improve the output as well as tampering
with a black stroke in a working type pickup in which a coil body cuts a magnetic flux and
generates a voice heavy body. As shown in Fig. 2, the coil structure of the 10 lP vlt type pickup
has two coils crossed by 45 ° with respect to the horizontal plane and 90 ° with each other as
shown in Fig. 2. It has been rolled up in one study. The coil body and the vibrator are configured
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such that the end face of the vibrator is disposed at the center position of the coil body. In the
case of functioning as an electrodynamic pickup, the coil body and the vibrator facing each other
j7 mutually attract each other, and at the same time the motion fulcrum of the imaging element 5
is not held at a predetermined position, the coil body and the imaging element are finally
attracted It becomes an arrangement of the vibrator and the coil body which The present
invention relates to an improvement of the above-described conventionally proposed
electrodynamic type pickup, and is intended to smoothly realize the defeat of the black stroke
and the EndPage: 1 improvement of the output. An embodiment will be described below with
reference to the drawings. The focusing state of the magnetic circuit and magnetism in the
pickup according to the present invention is as shown in FIG. 5, but the magnetic bending
between the vibrator 3 and the iron core 10 is very large compared to other conductor parts. .
Therefore, the magnetic flux induced in the vibrator 3 does not necessarily pass through the
whole of the book # -core 10, and if there is a portion with a small magnetic resistance, the path
will be followed-needless to say Absent. O In this magnetic circuit, the magnetic flux section
induced in the vibrator 3 in the state of completing the magnetic loop between the s and N poles
by the presence of the magnetomotive force section or magnet at the lower portion as shown in
FIG. That is, it concentrates on the lower part of the iron core 10. (5) When using the coil body
shown in FIG. 2 of the prior art, when motion of one channel 45 ° is applied to the oscillator, the
flux of the oscillator sweeps at a right angle on the coil and power generation in the coil is
stopped. The coil on the other side of the channel does not contribute to power generation
because the coil is parallel to the sweep direction. It will give birth to the black stroke. When the
coil body according to the present invention is used here, elimination of the black stroke and
increase of the output can be realized. That is, the most remarkable effect appeared in the use of
the coil body configured by winding the diamond core 10 in a relationship of 3 'i "to 39 ° with
respect to the horizontal plane and 7 to each other at 74 ° to '78 °. It is
Furthermore, when the end face of the carrier 3 is moved along the center line of the coil body
and in the vertical direction from the center position, it is more uniform than in the case where it
is disposed at the center position of the coil body as in the prior art. The improvement of the
output can be realized. That is, when the vibrator 3 moves to 45 ° -45 °, the magnetic flux
emitted from the vibrator 3 follows a minimum magnetic resistance value path in the magnetic
conductor of the iron core 10, and so-called biased magnetism acts. Therefore, the adaptation
angle of the coil 捲 angle naturally becomes 5 different, and it is possible to realize 0
improvement of the output by increasing the magnetic flux and hence the effective emitting area
of the center position of the coil body at the end face of the vibrator 3 . On the other hand, it is
necessary to prevent the situation where the coil body and the vibrator 3 are finally attracted at
the same time when the pickup according to the present invention functions smoothly and the
movement fulcrum of the split element is not held at a constant position. That is, since the iron
core 10 and the vibrator 3 are excited to the N and S poles so as to be different in polarity via the
yaw yoke and the 0 yoke 8, respectively, Forces which mutually attract each other act on the
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vibrator 3. The entire cantilever 2 is supported by the elastic holding member 4 but the iron i10
is fixed to the yoke 8. Therefore, when the elastic holding member 4 is flexible or in a fatigued
state, the direction of attraction force, ie, the direction of the iron core 10 I'll take it easy. The
dotted lines shown in FIG. 3 indicate approaching states. This suction force approaches the point
where it contacts the coil 6 of the iron core 10 as much as possible with a force inversely
proportional to the square of the distance. Therefore, the vibrator 3 is configured to maintain the
vibrator 3 at the balance point of the attraction forces of the iron core 10 and the vibrator 3 with
the movement fulcrum point 0 of the vibrator 3 as a fixed position, thereby realizing a smooth
pickup function At the same time, while playing a record, a tensile force to the tip of the needle is
generated with a large amplitude by the groove, but also at that time, a fixed position of 0 is
secured by the magnetism of the magnet and the wire The damping effect of the vibrator 3 by
the suction force can be improved. As described above, according to the present invention, the
improvement of the black stroke and the improvement of the output can be realized according to
the present invention, and moreover, the pickup machine part smoothly prevents the fluctuation
of the pickup constituting part due to various factors during record playing. . It is possible to
improve the function as well as to maintain
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a coil body according to the
present invention. FIG. 2 is a front view of the coil body proposed conventionally. EndPage: 2 Fig.
3 A longitudinal sectional view of a part of the pickup according to the present invention O Fig. 4
is a whole perspective view of the same. FIG. 5 is a magnetic state of the magnetic circuit in the
pickup and a focusing state diagram of the magnetic. In the figure, l: needle point 2. : Cantilever
3: Vibrator 4: 14 nature holder 5: Holder 6: Coil 7: Yoke (front pole) 8: Yoke (rear pole t). 9:
magnet 10: iron core 11: a air shield 12: wire 13: vibrator corresponding position 5 patent
applicant Mitachi Acoustics Manufacturing Co., Ltd. 葛 2 爾) Seki 6 Inventors other than the
above (1) inventor sakaishi te 21EndPage of a dozen address in Osaka Prefecture Sakai City
Yachiyo 3: 3
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