KR900004302Y1 - Control circuit for reel motor - Google Patents

Abstract

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Description

Reel motor voltage supply control circuit for each mode of video recorder

1 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

R1-R16: Resistor VR1-VR8: Variable Resistor

D1: Diode Q1-Q10: Switching Transistor

Q11-Q16: Current Amplification Transistor

The present invention relates to a reel motor voltage supply circuit for each operation mode of an image recorder, and in particular, an image recorder configured to control and supply a reel operating voltage and current for each operation mode to a voltage current control transistor. It relates to a reel motor voltage supply control circuit for each mode.

The reel motor voltage supply circuit for each operation mode of the conventional video recording and reproducing apparatus has been configured with a complicated circuit to supply a voltage for each operation mode.

This caused the circuit to be enlarged, which caused problems in the small sized video recorder, and due to the complexity of the circuit, accurate voltage and current control was not performed smoothly, which caused a problem in that the reel motor control efficiency was deteriorated. It has been the cause of the rise.

Therefore, the purpose of the present invention is to easily configure the circuit with the voltage and current control transistor to precisely control the voltage current according to the operation of each mode, and to reel by each operation mode of the video recording and reproducer that can supply the voltage current according to each mode to the reel motor. It is to provide a motor voltage supply control circuit.

The present invention for achieving the above object is to switch the input data "on" or "off" of the take-up reel motor signal, so that when the "on" switching fast forward (Fast Forward) signal and forward search ( A mode signal switching unit for switching and outputting a forward search signal and switching and outputting a rewind signal and a rewind search signal when the " off " / Recording) signal and the first switching unit for switching and outputting the fast forward search signal output from the mode signal switching unit, the play / recording signal, the fast forward signal and the forward search signal switched by the first switching unit A take-up voltage supply unit that amplifies the current according to each mode and supplies the take-up bolt table for each mode, an unloading signal and the mode signal inputted thereto. A second switching unit for switching and outputting the rewind signal and the rewind search signal output from the switching unit, and the current amplification according to each mode by the unloading signal and the rewind signal and the rewind search signal switched by the second switching unit. It is characterized by consisting of a supply voltage supply section for supplying the supply voltage for each mode.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram according to the present invention, which is switched on or off according to the input of a take-up reel motor signal, and outputs a fast forward search signal when switching on, and a rewind signal when switching off. A mode signal switching unit 1 for switching and outputting a rewind search signal, and a first switch for switching and outputting a play / recording signal input and a fast forward signal and a forward search signal output from the mode signal switching unit 1; A take-up is performed by the play / recording signal, the fast-forward signal, and the forward-search signal switched by the first and second switching units 2 and amplified by the current according to each mode and supplied to the take-up voltage for each mode. The voltage supply unit 3 and the input and unloading switches the rewind signal and the rewind search signal output from the mode signal switching unit 1 to be output. The second switching unit 4 and the unloading signal, the rewind signal, and the rewind search signal switched by the second switching unit 4 are current amplified according to each mode and are supplied to the supply voltage for each mode. The bolt supply part 5 is comprised.

In the configuration of FIG. 1, the mode signal switching unit 1 inputs a take-up reel motor signal to the base and is connected to the transistors Q2 and Q4 and the collectors of the transistors Q2 and Q4 that are switched on and off. The transistors Q1 and Q3 having a base connected to the resistors R2 and R4, the resistors R2 and R4, the resistors R2 and R4, and emitters of the transistors Q1 and Q3. Comprising bias resistors R1 and R3 connected between the bases, the transistors Q2 and Q4 are output to the collectors of the transistors Q1 and Q3 when they are switched on, and the transistors Q2 and Q4 In the " off " switching, a rewind signal and a rewind search signal input to the emitters of the transistors Q1 and Q3 are respectively output through the resistors R1 and R2 and the resistors R3 and R4.

The first switching unit 2 is a transistor Q5-Q7 and a resistor R5- that are turned on by inputting a play / record signal and a fast forward signal and a forward search signal output from the mode signal switching unit 1 to the base, respectively. R7).

The take-up voltage supply unit 3 has a base connected to the resistors R5-R7 of the first switching unit 2, respectively, and inputs a power supply voltage B ⁺ to the emitter so that the transistors Q5-Q7 The resistors Q8-Q10 for supplying a bias voltage to the transistors Q11-Q13 that respectively amplify when turned on, and the variable resistors VR1- that are connected to the collectors of the transistors Q11-Q13 to adjust the amplified output current. VR3).

The second switching unit 4 includes a variable resistor VR4-VR5 for adjusting the levels of the rewind signal and the rewind search signal output from the mode signal switching unit 1, and the anode contacts the unloading signal side. A transistor for inputting a diode D1, an unloading signal and a rewind signal and a rewind search signal output from the mode signal switching unit 1 to the base through the variable resistors VR4-VR5 and the diode D1, respectively; Resistors R12-R14 connected to the collectors of Q8-Q10, respectively.

The supply voltage supply unit 5 has a variable resistor (VR6-VR8) for varying the input current is connected to each emitter and the base is connected to the resistors (R12-R14) of the second switching unit (4) Comprising a bias supply resistor (R11, R15, R16) connected between the emitter and the base of the current amplifier transistor (Q14-Q16) for amplifying and outputting the current input to the emitter when the transistor (Q8-Q10) is turned on do.

Hereinafter, an operation example of FIG. 1 according to the present invention will be described in detail.

First, the operation state of the Play / Recoding (hereinafter referred to as PB / REC) mode is that the PB / REC signal “high” is applied to the base of the transistor Q7 and simultaneously drives the take-up reel motor. Is input simultaneously to the base of transistor Q2.

Transistor Q2 is thus " on " which causes transistors Q8 and Q14 to " off " so that supply voltage output terminal Vs is open and transistor Q7 is " turned on " The ter-base is forwarded and "turned on" by resistor R10.

Therefore, the current of the power supply voltage B ⁺ is amplified to output the voltage and current through the emitter variable resistor VR3 to the take-up voltage output terminal Vr to drive a take-up reel motor (not shown).

At this time, the output can be adjusted to fit the PB / REC mode by the variable resistor VR3.

On the other hand, when the forward search signal F-Search "high" is input to the emitter of the transistor Q3 while the "high" signal for driving the take-up reel motor is input to the base of the transistor Q2, the transistor ( By the "on" of Q4, the potential through the resistor R4 becomes "low" and the transistor Q3 is "turned on" so that the transistor Q6 is "turned on".

Accordingly, the "turn-on" of the transistor Q6 causes a forward bias (Bias) between the emitter and the base of the transistor Q12, thereby amplifying the current of the power supply voltage B ⁺ input to the emitter terminal, thereby changing the variable resistor VR2. Voltage and current are output to the make-up voltage output terminal (Vr) through), and the output can be adjusted to match the forward search mode by adjusting the variable resistor VR2.

On the other hand, looking at the operating state of the fast forward mode can be seen that the operation as follows.

That is, when the take-up reel motor signal "high" is input to the transistor Q2 and the fast forward signal FR "high" is input to the emitter of the transistor Q1, the "turn-on" operation of the transistor Q2 is performed. As a result, the potential of the "high" by the resistor R1 becomes "low", so that the transistor Q1 is "turned on".

Accordingly, the signal "high" is inputted to the base of transistor Q5 by "turning on" of transistor Q1, so transistor Q5 is "turned on", which causes the emitter-base of transistor Q11 to forward. As a result, the power supply voltage B ⁺ input to the emitter is amplified front and the fast forward voltage and current are output to the take-up voltage output terminal Vr through the variable resistor VR1. In addition, the voltage and current are adjusted as the variable resistor VR1 to output a voltage and a current suitable for the fast forward mode.

Therefore, when the take-up operation such as the fast forward, forward search, and PB / REC mode, the take-up reel motor driving signal “high” is inputted.

If the rewind operation signal RBW " high " state is now input to the emitter of the transistor Q1, the take-up reel motor signal is not input to the transistor Q2 and the transistor Q2 is turned off, so the rewind operation signal ( PEW " high " is input to the base of transistor Q8 through resistors R1-R2 and variable resistor VR4, thereby causing transistor Q8 to be " turned on ".

Therefore, since the potential of the collector terminal " high " state of the transistor Q8 becomes " low ", the transistor Q14 is " turned on & quot ^; so that the current of the power supply voltage B ⁺ input through the variable resistor VR6 is amplified. The voltage and current of the rewind mode are output to the supply voltage output terminal Vs. At this time, the voltage and current output from the collector terminal of the transistor Q14 are adjusted by the variable resistor VR6 to match the rewind mode.

On the other hand, if the tape performs a play operation for a predetermined time and then fast rewinds to rewind the front video signal and inputs the rewind search signal R-Search to " high " to the emitter of the transistor Q3, the transistor ( Since Q4) is off, the signal of the "high" state of the rewind search is input to the base of the transistor Q10 through the resistors R3-R4 and the variable resistor VR5.

The transistor Q10 input with the rewind search signal R-Search “high” as a base is “turned on” so that the potential of the power supply voltage B ⁺ input through the variable resistor VR8 and the resistor R14 is “ "Low" state, which causes transistor Q16 to be " turned on ".

Therefore, the current of the power supply voltage B + input to the emitter of the transistor Q16 through the variable resistor VR8 is amplified and output to the supply voltage output terminal Vs through the collector terminal. At this time, the voltage and current output through the collector terminal are adjusted by the variable resistor VR8 to match the rewind search mode.

When the unloading signal "high" is input to the anode of the diode D1 in order to be in the unloading state after the operation of the mode operation is completed as described above, the transistor Q9 is "turned on", which causes the transistor Q15. Is "turned on". At this time, the current of the power supply voltage B ⁺ input to the emitter terminal through the variable resistor VR7 is amplified by the " turn-on " of the transistor Q15, and a predetermined unloading voltage is supplied to the supply voltage output terminal Vs. And the tape is unloaded by the output of the current.

The unloading voltage and current may be output in accordance with the unloading mode by adjusting the variable resistor VR7.

As described above, in the present invention, in the image recording and reproducing apparatus, by switching the mode operation signal outputted for each mode, amplifying the current to become the operating voltage and current of the mode according to the switching signal, and thus, accurate current control can be performed according to each mode. At the same time there is an advantage that can increase the control efficiency of the reel motor by operating by the accurate time.

Claims (4)

In the reel motor voltage supply control circuit for each mode of the video recorder, "on" or "off" switching is performed according to the input of the take-up reel motor signal, and switching the fast forward signal and the forward search signal when the "on" switching is performed. And a mode signal switching unit 1 for switching and outputting a rewind signal and a rewind search signal when the " off " switching is performed, and the play / recording signal input and the fast forward output from the mode signal switching unit 1. A first switching unit 2 for switching and outputting a signal and a forward search signal, and a play / recording signal and a fast forward signal switched by the first switching unit 2 to amplify the current according to the respective modes, Take-up voltage supply unit 3 for supplying to each take-up voltage, the unloading signal input and the re-wine output from the mode signal switching unit 1 A second switching unit 4 for switching and outputting a dewind signal and a rewind search signal, and an unloading signal and a rewind signal and a rewind search signal switched by the second switching unit 4 to amplify the current according to each mode. Reel motor voltage supply control circuit for each mode of the video recording and reproducing, characterized in that consisting of a supply voltage supply section for supplying the supply voltage for each mode. The transistor of claim 1, wherein the mode signal switching unit 1 is connected to the transistors Q2 and Q4 and the collectors of the transistors Q2 and Q4 which are switched on and off by inputting a take-up reel motor signal to the base. Resistors R2 and R4, transistors Q1 and Q3 having a base connected to the resistors R2 and R4, respectively, and bias resistors connected between emitters and bases of the transistors Q1 and Q3, respectively. R1 and R3, and when the transistors Q2 and Q4 are switched on, the fast forward signal and the forward search signal respectively input to the emitters of the transistors Q1 and Q3 are converted into the transistors of the transistors Q1 and Q3. And outputs a rewind signal and a rewind search signal input to the emitters of the transistors Q1 and Q3 when the transistors Q2 and Q4 are " off " Reel for each mode of the video recorder, characterized in that the output through R4) Motor voltage supply control circuit. 2. The resistor (8) of claim 1, wherein the take-up voltage supply (3) inputs the power supply voltage to the emitter and at the same time the resistors (R8-R10) are connected between the emitter and the base so that the first switching section (2) Transistors Q11-Q13 for amplifying the current by inputting the fast forward signal, the forward search signal, and the play recording signal to the base, and amplifying and outputting currents connected to the collectors of the transistors Q11-Q13. Reel motor supply control circuit for each mode of the video recording and reproducing, characterized in that consisting of a variable resistor (VR1-VR3). A variable resistor (VR6-VR8) for varying the current inputted by the supply voltage supply section (5) is connected to each emitter, and bias supply resistors (R11, R15) between the emitter and the base. R14 is connected to the current amplifying transistor (Q14-Q16) for amplifying and outputting the current input to the emitter by inputting the rewind signal, the unloading signal, the rewind search signal switched in the second switching unit 4 as a base; Reel motor voltage supply control circuit for each mode of the video recorder, characterized in that consisting of.