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JPS5170506

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DESCRIPTION JPS5170506
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention,
FIG. 1 is a vertical cross-sectional view of a pink-up, FIG. 2 is a circuit diagram of an amplifier
used for big-up, and FIG. FIG. 4 is a circuit diagram of an input circuit of a multiplier, FIG. 4 is an
explanatory diagram of a pink-up frequency characteristic, and FIG. 5 is a circuit diagram
showing another embodiment of the booster. 3 ... power generation mechanism, 6 ... record
needle, 12 ... amplifier, 14 ... power supply. Section l ,? , 7J4 C surplus 1-21 tl) ity'io't / -2 ""
WvhQ ((deriving (θ 15 2 一 1 15 1 一 51-70506 (2) correction 4 47.4. 1
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pickup, which is
generated according to a groove of a record board and is amplified to directly amplify a voltage
within the pickup case. Conventionally, because the pickup needs to be made warm, small 111
+1) 8> 1, the power generation system which generates a voltage according to the groove of the
record board becomes smaller in structure, and hence the power generation output is extremely
low. Was to occur. When the output of a pickup that generates such a minute voltage is
connected to an external amplifier via an output code, the stray capacity of the output code
affects the minute voltage, and further the inductive hum affects one output code. Nine.
Moreover, amplification of such a minute voltage by the external amplifier further increases the
induction hum and deteriorates the noise / signal (ratio), and further the impedance matching
does not become good in the coupling of the pickup and the external amplifier. there were. As
described above, there is a problem in that a minute voltage of one pickup is connected to the
external amplifier by the connection cord and direct amplification is performed <6i 聡. In order
to solve such an inter-electric point, a method has been proposed in which a transformer is built
in the pickup and a minute voltage is raised in the pickup, but this method has a characteristic
curve (α) in terms of transformer characteristics. As shown in the above, the frequency
characteristic of the low frequency range of the output voltage is attenuated, and further, there is
a disadvantage such as increase of induction / power. The present invention is regarded as such
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a point Kflk, an amplifier is connected to a power generation mechanism that generates a voltage
according to the movement of the needle, and amplification occurs in the pickup and occurs due
to a minute voltage in the conventional one. To avoid the adverse effects of stray capacity,
induction hum, and external noise, noise / signal (ratio) to 1 to 411 L, and good impedance
matching in feeding between pickup and external amplifier K (3 ) 1, 7υ. It is something to be
appreciated. Furthermore, it is intended to improve the attenuation of the low frequency
characteristics of a pickup incorporating a conventional transformer, and to eliminate the
increase of five or the like caused by the transformer. In addition, the amplifier connected to the
power generation mechanism is an integrated circuit or the like, and it is a turtle that tries to
obtain a high gain in FIG. Next, an embodiment of the present invention will be described with
reference to the drawings. (1) is a pickup case, inside the upper part of this pickup case (1)! Place
the support plate (2) along 111. Then, the support plate (2) K power generation mechanism (3) is
thrown forward toward the front of the pickup case (1), and the cantilever (5) is picked up at the
opening (4) of the pickup case (11). Make it project freely.
A record needle (6) is fixed to the end of the canna (4) lever (5). Then, the power generation
mechanism (3) secures the 1-R (7) K-bar type permanent magnet (8), and the armature-power
generation coil portion (9) can freely vibrate in the lower part of the bar-type permanent magnet
(8). The armature-generator coil portion (9) is formed by being fixed to the rear end of the spiral
cantilever (5). Then, the output terminal of the armature-generator coil portion (9) is connected
to the amplifier a through the lead terminal I through the lead terminal. This amplifier 0 is a
solid-state electronic circuit provided on the printing base I [111], and constitutes a stereo
amplifier having left and right channels by transistors, integrated circuits and the like. Then, the
back portion of the printed circuit board 0 is provided with a storage section (~7 and a pot C1S
for storing the IK pot small power supply U. Then, the back portion of this printed circuit board 0
[IK provided the storage portion of the ultra-small power supply α ((IFJ vr facing the opening
portion fi [9 of the upper surface of the pickup case (1) It enables storage and removal of alpha
cilia, and this opening UK lid and lid plate can be opened and closed freely. Further, the output
terminal of the above-mentioned amplifier ti is connected to the pickup case (plinder 5 at the
rear end of the terminal 11 (terminal a @ of Is. Then, a locking projection (edge) to be engaged
with the upper 111K socket of the plug portion a is provided. Next, the electronic circuit of the
amplifier 03 will be described with reference to FIG. In the coil of the armature-generator coil
unit (9), a resistor (2) is connected in parallel to both terminals of the coil (2), and one terminal is
an emitter (6) of the transistor (). SK * Me, and the other terminal is connected to the base of the
transistor (d) through a capacitor and connected to the outside of the terminal (25,) of the right
channel. Then, a resistor (G) is inserted and connected between the base and collector of the
above-mentioned transistor I, and the collector is connected to the inside of the terminal (25,)
through a capacitor @ and also through a resistor (C) and a capacitor It is connected to the
outside 11 of the electron (25a). Then, connect the plus terminal of the internal power source,
which is the microminiature side 14, to the ground point of the resistor and capacitor, and
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connect the minus terminal of the power source a ◆ to the outside of the left channel terminal
254. Connect to the side and ground. Note that the inside of the left channel terminal (25J) is
symmetrically provided with the same circuit as the above-mentioned circuit (7) 4 bar.
Next, the input circuit 3 of the external amplifier will be described. The terminals (32,) (32+) are
provided to match the terminals (25a) (254) K of the left and right channels of the amplifier rI2,
and the internal side of the right channel terminal (32,) is a resistor, capacitor Close to the base
of the transistor via (b), and similarly connect the inner side of the left channel terminal (32J) to
the base terminal of the transistor (d) via the resistor (7) and capacitor (9) . Then, the external
sides of the terminal (32aX32 +) are both grounded. Also, the emitter of the transistor (d) is
connected to the external side of the terminals (32a, 324) via a resistor (d), and the emitter of the
transistor (d) is connected to the terminal (32,) via a resistor Connect to the outside of (S24).
(Akira 75 pa! color. ま た · Also, the collector terminal of the transistor U6CIll is connected to the
external amplifier body via the resistor 11)-, and the terminals (25a), (257), (32a), and (324) are
coupled to each other to provide a power supply. When α ◆ is applied, 9 forms a kind of switch.
In such a configuration, the pickup case (1) is connected by a plug OIK to the socket of an arm
not shown. Therefore, it is connected to the terminals (251EX 25J) of the left and right channels
of the increased m5as and the terminals (32,) (324) of the left and right channels of the external
amplifier (d), and among the terminals (25,) (32,) The external side and the internal and external
sides of each terminal (zs 4) (321) are connected II. Therefore, the negative terminal of the
electric charge tAu 4 of the amplifier lock is grounded, whereby the amplifier is driven. Then,
rotate the record disc (not shown) (9) 1.7b [粂-post, ↓ point the record needle (6) to the groove
on the ↓ and allow movement of the record needle (6) according to the record groove Do. The
motion of the record needle (6) is conducted to the armature-generator coil (9) via the cantilever
(5). Then, the coil Q − of the armature-generator coil portion (9) changes the rate of linkage of
the magnetic flux from the permanent magnet (8), and generates a minute voltage accordingly.
This minute voltage is amplified by the amplifier Q5 by the transistor (2), and is applied to the
input circuit C (11 of the external amplifier ()) via the terminal (25,) and amplified. The amplifier
a is similarly installed in both the left and right channels and configured to amplify. In addition,
since the amplifier (Is can be driven by a minute current of one channel 50 mA; 1 m degree, the
life of the small battery used for the power supply a.rho. It can be kept long enough.
Moreover, the gain of the amplifier O can be obtained to about SO dB, and boosting of the minute
voltage can be reliably made to 5 to 1 QsV @ degree. Next, FIG. 5 shows an embodiment of the
ground of the amplifier .alpha.2 shown in FIG. 2. In FIG. 5, the circuit of FIG. That is, the coil
shown in Figure 2? The base of the transistor (2) is connected via a capacitor to the connection
point of the pole and the resistor, and a Ka resistor between the pace collectors of the transistor
is inserted. Then, the positive terminal of the ultra shed side 14 is connected to the collector of
the above transistor (d) through a resistor (c), and the negative terminal of this tIIa4 is a terminal
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(254) 1b, all of them are Connect to the outside of the 'and ground. Further, the tweezers of the
above-mentioned transistor (d) are connected to the external side of the terminal (25,) through
the capacitor (2). The same reference numerals as in the above embodiment denote the same
parts in FIG. This circuit only uses the circuit of the above embodiment as the emitter ground,
and the operation is completely the same. According to the present invention, since the amplifier
is connected to the power generation mechanism which generates a voltage according to the
5IIJVC of the record needle and amplified in the pickup, the stray generated due to the minute
voltage in the conventional one The adverse effects of capacity, increased lead noise, and the
influence of external noise can be reliably prevented. Therefore, the noise / signal (ratio) is
significantly improved, and it becomes possible to perform good impedance matching only in the
combination of the pickup 4 and the external s9i · normal amplifier. Furthermore, the attenuation
of the low region of the peripheral fluid number characteristic of the pickup using the
conventional transformer shown by the characteristic surface @ (α) in FIG. White lines (flat
characteristics can be obtained as indicated by a 轡. And any induced ham that occurs in a book
using a transformer can be cancelled. In addition, the amplifier can be configured by solid
electronic circuits such as integrated circuits to achieve weight reduction, and moreover, high
gain, high stability, and reliability can be obtained. Moreover, since an internal power supply for
driving the amplifier is built in the pickup, it is not necessary to supply power externally, and
cords and the like necessary for this are not necessary at all, and the ham induction and the like
accompanying it are reliably eliminated. -The dark can provide excellent nine pickups.
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