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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a driving circuit of a
conventional piezoelectric crystal, FIG. 2 is a diagram showing waveforms of respective parts in
FIG. 1, and FIG. 3 is a circuit showing one embodiment of the present invention. FIG. 4 is a
diagram showing each part waveform in FIG. X: piezoelectric crystal, Q □, Q2: transistor, D:
diode, R1sR2> R3: resistance.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
crystal drive 1h # BMec having an electro-mechanical conversion function, and more particularly
to a circuit suitable for driving a turtle crystal for ink droplet ejection in an ink jet printer. As a
method of ink drop ejection, the volume of the ink chamber is reduced by the distortion of
piezoelectric crisp (1) or-3133 (two or more), and from the nozzle toward the recording sheet
There are those that eject ink drops. In this case, the number of ejected ink droplets per unit time
corresponds to the drive frequency of the piezoelectric crystal, and it is necessary to drive the Kd
pressure crystal at high speed to increase the printing speed of the printer. By the way, since it
has piezoelectric crystal quality, equivalently noon capacitance, FIG. 7 shows a conventional drive
circuit, which requires a Korean charge circuit and a discharge path in its drive circuit. The
transistor Q2 is turned on and off in response to the drive signal 8 of the local piezoelectric
crystal X, the transistor Q2 is driven by the output of the transistor Q, and the transistor Q is
complemented by KON and off. By the ON operation of the transistor Q2, the charging operation
of applying the crystal voltage% pressure through the resistor R1 can be avoided. Further, as the
transistor Q2 is turned off, the crystal X is discharged through the resistors hR1 and R2. FIG. 2
shows a waveform at the temple and temple section, in which (S) shows a human power signal S,
(A) shows a crystal flow of a crystal, (C) shows a discharge current, and (2) shows a crystal
voltage. (Λ)! In this conventional circuit, since the current flows in the 1N% f resistor of the F
transistor Q2 and the tftR2 ”zft flows, there is wasteful power consumption, and the resistor 12
is rated-The membership fee is large. 0 In this case, if the resistance value of the resistor R2 is
increased, the power consumption is small and the resistance can be reduced by a small amount
or the crystal can not be driven at high speed. On the other hand, a transistor is used instead of
the resistor R2. It is also conceivable to use this transistor and to turn it on only when the crystal
is discharged, or-transistor's trap! +1 J l [11 road becomes l v 、, and the time delay on the drivepath becomes l l i 1 i K during that time. Purpose of this invention: IglW! There is a power supply
K that provides low power consumption and low power consumption and a linear speed
operation. 3 is a circuit diagram showing an embodiment of the present invention. The transistor
Q and the H signal 8 are turned on to produce 01 'F11, and the F transistor Q is driven by the
transistor Q to produce 011 and OFF 1111 in phase.
In addition, from the ONK of the transistor Q2, the piezoelectric Tallista (3) is charged through all
the resistors R4 to charge it. Here, the discharge of the crystal X is a diode D, and a transistor Q
through a resistor R3. The current flowing to the 0, ie, the transistor Q. Since Q2 and Q2 are
turned on and off in phase, the transistor Q is in the Owl state during the OFF period of the
transistor Q2, and discharge is performed with a time constant determined by the capacity of the
resistance tag and the crystal X. Fig. 2 shows each part of cedar, (S): signal S, 働) photoelectric
current, (C) emitting ** current, (2) crystal 1 pressure ○ Fig. 2 As apparent from the waveform in
FIG. 3, it is sufficient to supply only the butterfly charge at the ON operation of the transistor Q2,
power consumption can be reduced, and heat generation of the circuit can be suppressed. Also,
the transistor Q2 may be of a smaller current rating. The photodischarge time constant of the
mata and crystal X can be appropriately set according to the total current of 8 transistors Q and
Q2, and the circuit can generate a small amount of heat and enable high frequency operation. In
the present embodiment, when the increase rate of the transistor Q2 is insufficient, a diode is
provided in parallel with the resistor R3 with Kf3 to increase the 5 star Q 20 pace m & the
transition (not change) without changing the discharge current. Even if the diode D can be
provided between the base and the emitter of the transistor Q 20 O In this case, the rating at the
time of discharge is increased by the intervention of the resistor R 4, so R6> R, RIC1k if it is
determined The resistance of R, -R,) can be used to increase the base current of the transistor Q2.
As has been clarified above, the driving circuit according to the present invention consumes
power by discharging and discharging current of crystal, and enables high frequency operation
to reduce the discharging and discharging time constant. In addition, the circuit configuration
requires two transistors, one diode and a small number of resistors, and the response delay due
to the circuit has an excellent effect when applied to an ink jet printer having almost or many
crystal drive circuits. .
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jps54143633, description
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