JPS5726997

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DESCRIPTION JPS5726997
Specification 10 Title of Invention
Electrostatic type big ag carte, di
3. Detailed Description of the Invention The present invention relates to an electrostatic pickup
cartridge using an inductive electret structure. As is well known, electrets have the property that
a charged electric charge lasts semipermanently, and are widely used in various fields as
electrostatic transducers and the like. FIG. 1 shows the principle of a conventional electrostatic
pick-up cartridge using an electret like an eyelid, in which an electret material 12 such as a
polymer film is applied to a back electrode 11 made of a conductive metal substrate. The
electrostatic unit is configured by pairing the movable poles 16 supported by the reflectors 13
using the electret structure 13 which has been converted into an electret as a fixed electrode. As
such, when the movable pole 16 / f of such an electrostatic unit, is displaced by force / threak
first vibration, the electrostatic capacitance C between both electrodes will be changed, If the
charge Q (in this case, given by the electret and the grid 1B) is constant from Q = CV, the voltage
V between the two electrodes will be changed. Therefore, the change voltage V is impedance
converted through the field effect transistor EndPage: 1 FE ↑ etc. and extracted as a low ′
impedance, so that the vibration with the record sound groove electrostatically converted into an
electric signal. A monaural tig of electrostatic type, square, f-cartridge and di-type, which are
converted, are realized. By the way, the electrostatic transducer using the electret structure as
the fixed electrode as described above is different from the usual one and the direct current
power source for polarization becomes unnecessary, so the structure is simplified and the size is
reduced as much as possible. It has the advantage that it is possible and, in turn, can be made
less expensive. However, the electret structure which is most important has a serious drawback
that it tends to adversely affect various characteristics as a transducer in that the variation of the
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surface charge density, that is, the unevenness of the charge distribution is large. FIG. 3 shows an
example of measurement of the surface charge distribution of such a conventional electret
structure, in which the electret material 12 is deposited on the back electrode 11 made of an
aluminum plate to make it electret, As you can see, it is very clear that the variation is very large
within several hundred volts. Also, the conventional electret structure is exposed so that the
surface portion of the electret material 12 is exposed to the air directly, so that it has poor
moisture resistance and not only has problems in terms of economic stability, but it also shortens
the life It had serious drawbacks.
Furthermore, in the stereotype electrostatic type 'pickup cartridge configured as shown in FIG. 2,
the charge distribution between the conventional electret structures 13 and 13 as described
above used as a pair of fixed poles for left and right channels is Due to the variation, there were
the following serious drawbacks. That is, when the electret structures 13 and 13 of the left and
right channels, which are a pair of fixed poles, have variations, an output difference occurs in the
left and right inner channels. For this reason, as shown in FIG. 2 (b), when the left-right channel
output becomes the same between the movable pole 16 and the left and right channel electret
structures 13 and 13 which become a pair of fixed poles, A center deviation d is generated in
which the center θ ′ of the movable pole 16 is shifted to either the left or right side with
respect to the true center 0. Since such a center shift causes a positional shift of the dan and the
mother supporting the cantilever 14, as a result, deterioration of the seri and inertia
characteristics between the left and right channels and degradation of the on-state characteristic
and variation in the compliance characteristic are caused. In the long run, further adjustment will
be required to eliminate these. Therefore, the present invention has been made in view of the
above points, and in particular, it is possible to achieve the uniformity of the electret surface
charge density well as the induction (g) form and to improve the stability significantly. By using
the electret structure, it is possible to significantly improve the characteristics, and it is possible
to achieve very good electrostatic form, qua,! The purpose is to provide cartridges. First, basic
examples of the induction (electric) type electrets and toroids used in the present invention will
be described. That is, as shown in FIG. 4, an electret material 22 made of a polymer film such as
PP, TFE, or FEP is applied to the back electrode 21 made of a conductive metal base at the same
potential as the earth to form an electret. The conductor 24 made of a conductive metal material
or the like having an area (shape) larger than this is stacked on the electret element 23 formed
by An electret structure 25 is realized which is configured such that charges of the same sign as
or lower than the potential of the electret element 23 alone are exposed on the surface of the
body 24. And an electret configured as described above. When the charge of the electret element
23 has a negative sign e, the '' charge of positive and negative signs is placed on the back side of
the conductor 24 stacked on the element 23 and the element 23 is placed on the front side. The
phenomenon that a charge of negative sign e, which is the same sign charge, is induced, or
EndPage: two-fold dielectric (polarization) action is brought about.
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In this case, the presence of the conductor 24 not only causes the dielectric effect as described
above, but also the uniformity of the surface charge density as the electret structure is well
achieved and the stability thereof is achieved as described later. It is important that it is secured.
In the above, when the surface potential of the electret element 23 alone is [E0] and the surface
potential induced on the conductor 24 mounted thereon is [E,], E, α, E, red 0S! Where α is also
called an induction coefficient, and it is confirmed that when the conductor 24 is a metal, it
substantially falls within the range of α = 0.6 to 0.99. The Further, 81 es is an area of the
electret element 23 and the conductor 24, respectively, and in this case, it is set to a relation of
<St <Sm as described above. Further, according to the area ratio of 5IAs, tc and E8 can take out
an arbitrary potential (but the same sign as Eo) as needed below Eo. Fig. 5 is an electret assembly
realized as described above! The switch SW connected to the conductor 24 is closed and the
conductor 24 is brought into the same potential or zero charge state first, and then the switch
SW is turned on. Make it in an insulated state by opening it. Then, if the conductor 24 is placed
on the surface of the electret element 23 while maintaining the zero charge state using, for
example, an insulating bottle set or the like, the dielectric action occurs as described above. In
this case, when the conductor 4 is a conductive metal material, charges are instantaneously
induced. Also, assuming that the switch S · W is closed again from such an induced state, the
charge disappears as if the conductor 24 is a metal, so that the potential becomes zero
immediately. FIG. 6 (,) shows another specific example in which the dielectric 24 is stacked while
being shifted relative to the electret element 23, and in this case as well as in the case shown in
FIG. 4 and FIG. You can get the effect of FIG. 6 (b) shows another specific example in which the
surface of part of the electret element 23 is not covered when the conductor 24 is stacked on the
electret element 23 in a shifted manner. In this case, assuming that the area of the overlapping
portion of the conductor 24 and the electret element 23 is 5 tW), E and E described above. The
relationship with is That is, also in this case, the value of E can be arbitrarily selected by
changing S (support). The case of 5 (1) = 81 is the same as the case described in FIG.
In addition, the temporal change (leakage characteristic) of the charge induced to the
relationship of S ≦ s 2 1 1 shows one index of the 安定 stability, and the conductor 24 is a metal
material (but not the normal dielectric Among them, in the case of the fluorocarbon resin
system), good stability is obtained with almost no change from the initial state. By the way, such
stability is the electret structure L! Since the surface of the element 23 is protected by mounting
the conductor 24 of a larger area on the surface of the L / foot element 23, the electret surface is
directly exposed to the air unlike in the conventional case. It is encouraged by the fact that it is
made not to be exposed to the public. In addition, the protection of the surface of the electret
element 23 by the conductor 24 is not only moisture resistance, it is advantageous not only in
terms of temporal stability, but it is also possible to extend the life. Stability can be ensured. As
shown in FIGS. 8 (a) and 8 (g), if the surface of the electret element 23o 'is provided with
wavelike irregularities, the area directly in contact with the conductor 24 mounted thereon is
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reduced. Therefore, it will be possible to further enhance the stability from the handling. FIG. 9
shows an example of measurement of the surface charge distribution of the electret structure L
"as described above. In the example EndPage: 3, for example, the electret material 22 is
deposited on the back electrode 21 made of an aluminum plate to electret. A conductor 24
having a larger area is placed on the electret element 23 and the distribution state of the charge
which is induced on the surface of the conductor 24 is obtained. That is, as can be seen from this
figure, it can be known that the surface charge density is uniform and hardly dispersed in all
parts unlike the conventional case. That is, the electret structure 25 in which the conductor 24
having a larger area M is mounted on the electret element 23 as described above induces a
predetermined charge based on the electret charge simply on the surface of the conductor 24.
Not only does it exhibit a phenomenon, but it also offers the extremely excellent advantage of
improving the stability brought about by the protective effect of the electret element 23 by the
conductor 24 and the possible equalization of the surface charge density brought about by the
surface charge leveling effect. As soon as it is clear that it is something we possess. In this case,
since the conductor 24 is in the form of an area having a larger area than that of the element 23,
the charge is further reduced as the density of the charge exposed on the surface of the
conductor 24 decreases by dilution of the charge density. It has the advantage that variations in
density can be reduced.
Next, referring to FIG. 10, an example of the electrostatic type biq cartridge according to the
present invention, which is configured using the induction (turn) type electret structure 25
improved as described above, will be described. That is, in FIG. 10, 31 'is a movable pole
supported near the base end of the cantilever 33 which is made swingable through the damper
32. Then, a pair of electret structures 25.25 configured as described above in the form of a letter
substantially in front is placed at a predetermined distance in a state inclined 45 ° on the left
and right sides of the movable pole 31, respectively. , 34b are arranged. In this case, both fixed
poles J4m, 34b are arranged with the conductor 24.24 @ in the electret structure 2B, 25 facing
the surface facing the movable pole 31 and not shown from both conductive $ 24.24
respectively Leads 35 * and 35b connected to the impedance conversion circuits for the left and
right channels are output from the MR 9. In the above configuration, similarly to the
conventional one in operation, a stereo in which the variation voltage for each of the left and
right channels between the movable pole 31 and both fixed poles 34m and 34b according to the
vibration amount of the cantilever 33 is taken out It is a thing of the tyg. However, in this case,
the pair of electret structures 25 and 25 used as the fixed poles 34m and 34b for the left and
right channels are designed to achieve as uniform surface charge density (charge distribution) Ω
as possible and improve the stability as described above. In addition, since the voltage E1
exposed to the conductor 24 can be varied by changing the area S of the overlapping portion
itself (1,), both electret structure 25.25 It can be easily done so that there is no difference in the
voltages obtained by the above, so that there is no difference in the outputs of the left and right
channels. For this reason, it is not necessary to adjust the output by shifting the center of the
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movable pole as in the prior art, and in the end there is no position shift in the damper
supporting the cantilever. Variations, etc., which makes it unnecessary to perform adjustment
operations, and can be simplified. However, since the uniformization of the surface charge
density and the improvement of the stabilization are achieved, the characteristics as a whole can
be greatly improved. FIG. 11 shows another embodiment. In this case, the damper 32 supporting
the cantilever 33 supports two vane-like town poles 31g and 31b for the left and right channels,
and the Of pole 31a.
31b is a pair of electret structures 25 and 25 respectively configured as described above, in
which fixed poles J4a 'and J4b' for both right and left channels are paired, as in the case of the
upper side. It is possible to exert an effect. The present invention is not limited to the
embodiments described above and shown in the drawings, and it goes without saying that
various modifications and applications are possible without departing from the scope of the
present invention. Therefore, as described in detail above, according to the present invention, in
particular, by using an electret structure capable of making the electret surface charge density
uniform as well as greatly improving the stability as the induction (turned) form, It becomes
possible to provide a very good electrostatic pi, quadrangle, and gusker cartridge which can
improve the characteristics significantly.
4. Brief description of the drawings. FIG. 1 and FIG. 2 are structural and principle views of the
electrostatic type pi, qua and gul cartridge using the conventional electret structure, and FIG. 3 is
used for FIG. Measurement diagram showing the surface charge density of the conventional
electret structure, FIG. 4 is a structural explanatory view showing a basic example of the electret
structure used in the present invention, and FIGS. 5 and 6 show concrete examples of FIG. 7 is a
measurement diagram illustrating the time-dependent change characteristic of charge induced in
the electret structure of FIG. 4, FIG. 8 is a view showing another specific example of FIG. 4, and
FIG. 9 is FIG. 10, 11 show an embodiment of the electrostatic picker, f cartridge, di according to
the present invention using the electret structure of FIG. 4, and FIG. 10 shows an embodiment of
the present invention using the electret structure of FIG. It is principle composition explanatory
drawing which shows an example. 2 · · · · · · back electrode, 22 · · · electret material, 23 · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 25 electret structure, 31 · · · 5T @ m, 32 · · · Danno -1J3, ...
cantilever, 34a. 34b ... fixed pole. Applicants Attorney Attorney Takehiko Suzue EndPage: 5
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