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Patent application (7) · · June 1972 / (/ "1 child 丼 丼 丼 丼 殿 1 、, the disease Vl V 纏 鳳 纏 鳳
俟 俟 4. 4. Agent 8160-ro [phase] Japan Patent Office No. 1 Published Patent Publication No. JPA-49-2t1 j 0 Description of the Invention An armature is attached to a vibration system equipped
with an electromagnetic conversion element stylus. Two pairs of mutually orthogonally arranged
pole pieces are provided in close proximity to each other on the skin aspect, and the two pole
pieces are magnetically coupled to a magnet, and A swing fulcrum of the vibration system is
provided on the armature located substantially at the center of the opposing distance of the set
of pole pieces, and a change in magnetic resistance of a magnetic circuit including the armature
based on the vibration of the vibration system. An electromagnetic fJ 換 ° conversion element
designed to extract a quantity as an electrical signal.
Detailed Description of the Invention Although various conversion elements have been proposed
for converting the f # I signal of the conventional ray code into an electric signal, the present
invention drives an armature composed of a high magnetic permeability material held on a
cantilever, and The present invention relates to a stereo electromagnetic conversion element for
converting a change in magnetic flux due to driving into an electric signal. The present invention
will now be described with reference to the drawings. An example of the mold release conversion
element will be described. FIG. 1 shows the whole integral layer of the element which serves for
the principle explanation of the electromagnetic transducer according to the present invention,
and in this example, this general view is indicated by reference numeral 11). The conversion
element j11 is provided with a vibration system 13 in which a stylus (2) for converting an
acoustic signal into vibration energy is provided. That is, the stylus 12) is attached to the light
leak of the cantilever 14) as shown in yp 2 and 3 respectively, and the other end of the cantilever
(4) is made of a high magnetic permeability material. In this example, the arma near (5) is
constructed as a so-called μ pipe in the strain of Fig. 3 and its inner diameter is selected to be
larger than the outer diameter of the cantilever 14). Because of the adhesive layer (6) both 141.
"+ 51 is designed to be mechanically coupled. -As an example, the inner diameter of the
cantilever (4) is 0.3 mn, the outer diameter is 035 mm, 5 armati airs 15), jF mm and Q, about 5
mm can be selected. Then, an annular body (7) formed of a north wall-like hard material having a
cross-sectional substantially inverted triangle shape EndPage: 1 on the armature (5) such that the
fulcrum of the aia system (3) is the approximate midpoint of the armature 151 An open annular
body formed of a material which is softer than the annular body (7) on the side of the annular
body (7) other than, for example, the outer peripheral surface, by fixing so that the seven tapered
portions become the inner surface 8) is attached, and as a whole, a vibration system (31
supporting points s (7 persons) is configured). Thus, the point P at which the center of the
annular body 17) and the central axis of the armature 15) coincide is of the vibration system (3)!
Focused on movement. In this case, the vibration system] 3) is a component up to the point P of
the armature 151. The open ring (8) can also serve as a shock absorber. The fulcrum s (seven
people) of the vibration system (3) is not shown but is attached to the support plate. The annular
body 171 may be formed of a polypropylene-based resin, and the open annular weir 18i may be
formed of a dityl rubber-based resin. In contrast to the vibration system (3) having such a
configuration, this armature (5) is disposed in the magnetic field on both end circumferential
surfaces of the armature 15), and a magnetic circuit including the armature (5) is formed in two
ways. .
That is, as shown in Fig. 1, the same shape is used on both sides of the metal 5a) of the armature
15J, with the same shape on the X-X and Y-Y lines with an angle of 45 ° on both sides with
respect to (2). There are two pairs of pole pieces LA, LB and turtle, and a pair of whales, in which
case the central axes of the pole pieces LA, LB and RA, R13 in the longitudinal direction coincide
with the x-x4 and YY lines. Positioned and distributed. Therefore, each pole piece LA, LB, and
bale, mass are in a state of being orthogonal to each other. Each direction of the father is exposed
to the center line of the vibration system 13). Similarly, the other end of the armature +51 holds
the same angular relationship and casting relationship as described above, and as shown in FIG.
2, two pairs of pole pieces LA /, LB / and & h ', Rf3' of the same shape. 2 pairs of co-hole heaths
(LA, LB, RA-Sho) and (LA ', LB', RA ', Re') are arranged, each outer surface of which is a high seca
magnet (1 ( 11 ((10a) to (10a)), which are temporarily and mechanically connected, in which
case the N other side is fixed so as to be in contact with the pole pieces iLA, Lg and R *, Re
located on the front side ing. In addition, since FIG. 2 is a cross-section on the line X-X of the
brunt 1 and is mourning, the other pole piece (: t, A, L, LA ', L, s') is not shown. . On the other
hand, these two sets of pole pieces are each wound with a predetermined number of turns ((lla),
(llb) (12a), (12b) and (lla) ', (llb) / And (prefecture; a) '. (1215) /) are mounted corresponding to
the respective pole pieces, and for example, in the pole pieces (RA, RB and RA ′, RB ′) facing
each other as shown in FIG. 12a), (12b) and (12a) 's (12b)' are respectively connected as shown
in the figure, ie, the other end of the wire ring (12b) and one end of the wire ring (12b) ' The
other end of the ring (12a) 'is connected to one end of the wire ring (12a), and a pair of output
terminals (14a) and (14b) are led out. The same wire connection method as described above is
also applied to the other filaments ((11,), (llb) and (lla) ', (llb) /) and the output electrons (13a)
and (13b) Is derived. Note that the wiring method in Fig. 1 is shown on a route, and wire rings
(lla) and (llb) and wire rings (12a) and (12b) are not directly connected respectively. Will be
apparent as noted above.
The operation in the case where the sound groove of the 45 ° -45 ° stereo record is traced
using the electromagnetic conversion element ill having the above-described principle
configuration will be described. If the sound groove of the record is a stylus (traced by 21 the
acoustic signal being cut is transmitted to the stylus +21 as an oscillating two-handed energy, so
that the oscillating system (3) will be driven. Absent. And, of course, the vibration system (3)
works at the intersection point P of the annular body (7) and the armature (5) as a fulcrum. The
audio signal of the stereo record has an L component, R4 divided by La aa divided and L-R,
components, but let us consider the case where the two R component acoustic signals are
extracted as electrical signals. In the case of the R component, the stylus (2) is vibrated in the
vertical direction (actually, it moves in the oblique direction parallel to the X-XflA shown in FIG.
1) by the abutting sound groove. If the stylus (2) moves downward as shown by the dotted line in
FIG. 2, the counterbalance state (indicating that it is at rest) on the armature (5) is broken, and to
one pole piece. Close to KA'Ill, conversely the other pole piece 顯. It comes to separate from the
viewpoint of 116 '. As a result, the amount of magnetic flux passing through the magnetic circuit
(Magnet (10c)-Polepiece R,-Armature (5)-Polepiece RA /-Magnet (10c)) including EndPage: 2Lepiece Europe, R Person I , Its magnetoresistance (reluctance) decreases. The amount of
magnetic flux passing through the magnetic circuit including pole piece sho, Re '(@ stone (10 d)pole piece ア ー-armature 151-pole piece R13 /-magnet (10 d)) decreases gradually and the
magnetic resistance increases . The state of the magnetic flux change of the pole pieces RA, 'RA /
and' bBf3 'is as shown in FIG. In the figure, the horizontal axis of Jc indicates the displacement of
the stylus (2), and when the left 1ll (minus @ of the coordinates) shifts upward, the right 1m (¥!).
i! When the mark plus l1 l) shifts downward. When the vertical axis indicates the amount of
magnetic flux, and the magnetic flux toward the armature (5) is the downward magnetic flux, and
the outgoing magnetic flux is the downward magnetic flux, the positive side of the vertical axis is
the amount of change in the upward magnetic flux, It becomes the amount of change of magnetic
flux. Now, if the stylus 12) is moved downward by the sound groove to which it abuts, the
magnetic flux φA1φA / passing through the pole piece RARA / increases from the point q as the
magnetic flux Φ as in curve (15, (16) Conversely, the magnetic flux AA / decreases from the
point q / due to the separation of the armature (51, while the magnetic flux 、 B, φs1 passing
through the pole piece RBR43I is conversely the curve αη, (as indicated by ld point q% The
magnetic flux 'B decreases and the magnetic flux ΦS / increases with the same q'.
When the stylus (2) shifts upward, the flux increases or decreases contrary to the above. Then,
the resultant magnetic flux Φ (Φ = (Φ to -ψ B) + (Φ A /-81 81)) is as shown by the curve 9 and
the magnetic flux of the magnetic circuit including the armature 15) based on the amount of
change of the resultant magnetic flux Φ. The resistance changes, so that the output terminals
(14a, 14b) have an electromotive force superior to the amount of change of the
magnetoresistance. The electromotive force means that the acoustic signal is converted as an
electrical signal without being corrected. The point q% Q 'represents the magnetic flux when the
stylus (21 is not moving at all, and in this case, the synthetic magnetic flux does not generate an
abrupt electromotive force because its change is not superior as shown in FIG. 4). , Also can not
take out the electrical signal. Here, since the stylus (2) vibrates in parallel to the X-X line, the
opposing distance of the stylus (2) between the pair of pole pieces LALB and LA /, LB / does not
change and the output terminal is changed. In (13a) and (13b), the synthetic magnetic flux // f) K
amount can not be detected, so that no electromotive force is generated due to the displacement
of the stylus 12 between the output terminals (13ω (13b)). That is, this means that there is no c1
'X talk between the R component and the L component. In the above description, the acoustic
signal of the R component is taken out as an electrical signal, but when Li2 is a minute, the pair
of pole pieces L7. , The stylus 123 vibration system 13) is vibrated in parallel on the Y-γ line
passing through the central axes of LB, LA /, I, s /, and vibration energy is converted from the
output terminals (13a), (13b) Then, an electric signal can be taken out, and in this case as well as
the R component, an acoustic signal of the R component can not be taken out as an electric
signal. That is, there is no crosstalk. In the case of 45 ° -45 ° stereo record, tI'iL, other R
components + R components and L-PI. Component is included. When the stylus (2) is moved in
the lateral direction (45 ° inclined to the X-X line) shown in FIG. 1, the L + R component is LRFft, and the stylus (21 is in the vertical direction (Y-Y sparsely). It can be moved to 45 °) and
taken out as an electric signal each time. These descriptions are omitted. Among them, Fig. 1 is a
principle diagram used to facilitate the understanding of the present invention as described at
the beginning of the description, but in fact, it can be configured as shown in Fig. 5, In this case,
one high-power single stone (Lα is used, N pole III (stylus (2) noble) 4C2 pairs of pole pieces x
(LA% LB and RA, R 61 are attached, 8 The other two pairs of pole pieces LA /, LB / and HA ′ ′
B, 3 I are attached to the pole piece (right part of the fulcrum part), but in this case, two pairs of
pole pieces (LA).
Both LB and RA, R6iLA /, I, s / and Europe I, and Tz) are formed by bending sheet metal. It is
shown on a route basis in the figure. In addition, this shape can be selected suitably. Of course,
the present invention is not limited to this specific example. As described above, in the present
invention, two pairs of pole pieces are used (LA ′, L′ ′ B, R ′ ′, mass; LA /, LB ′ and RA
′,) ′ ′), both mg of armature 15) And the fulcrum of the vibration system (3) is disposed at
approximately the middle position of EndPage: 3 of the two sets of pole pieces. As such, by using
two sets of pole pieces 914 FIG. 1! As indicated by Q1, the output of the electrical signal is also
increased because the amount of change of the combined magnetic flux Φ can be increased.
Roughly, twice the output of one set of pole pieces ((LAI-8 and RA, Rf3) or (LA /, LB / and R ',
RB')) is obtained. Also, since the vibration system (3) does not contain the magnet housing ω, its
equivalent mass is approximately determined by the sum of the cantilever (4i and the armature
(5)-i). As shown in FIG. 4, since the radiability of the resultant magnetic flux 良好 is good,
distortion of the converted electricity Mfr is good. Furthermore, since two sets of pole pieces are
directly magnetically coupled to both magnets of the magnet 1 lol, there is no loss of conversion
efficiency, and a large magnet uj is formed on the crucible so that the conversion efficiency is
further improved. In addition, the connection of each wire ring can be made to make the
conversion element (1) 1ll1 without being influenced by the rounding external magnetism of the
reverse coupling machine, for example, the induction magnetism from the motors. Fig. 1 is a
front view showing in principle the configuration of the electromagnetic transducer according to
the present invention, Fig. 2 is a cross-sectional view taken along line X-X of Fig. 7 and Fig. 3 is
an enlarged cross-sectional view of a vibration system. Is a magnetic flux change curve, and FIG.
5 is a perspective view showing an example of a specific configuration. lj + is an electromagnetic
conversion element, 12) is a stylus, 13) is a vibration system, 14) is a cantilever, 15) is an
armature, -17) is a negative state, (7A) is a fulcrum, μα ((10a) to (10) 10d)) is a magnet, ((lla),
(llb) and (! 2a), (12b); (lla)% (llb) / and (12a) ', ozb)') 'is a filament, (L, LB-and ~ 1, Xu; LA /% LB /
and RA / 1 顯 l) is a pole piece. % Patent applicant Sony Corporation Substitute 9 Fujiwara
EndPage: 46, Inventors other than the above, patent applicant Voices or agents (1) Inventor
name Address (Location) Name Address (Location) Name (2) -Patent applicant address (location)
address (@ location) (3) Agent EndPage:
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