KR890000167Y1 - Pause mode of video tape recorder - Google Patents

Abstract

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Description

Power Saving Circuit in Recording Stop Mode of Video Tape Recorder

1 is a schematic diagram of the entire system of the present application.

2 is an algorithm diagram performed by the microcomputer in FIG.

* Explanation of symbols for main parts of the drawings

6: Standby mode setting unit RL: Power supply control relay

R₁R₂: Resistance SW: Standby Mode Switch

C₁: Capacitor ND: NAND Gate

OR: orgate

The present invention relates to a power saving circuit in a video tape recorder in a video tape recorder, in particular a camera-integrated video tape recorder, to prevent unnecessary power consumption during a PAUSE mode.

In order to record a specific scene after the power is supplied, the conventional camera-integrated video recorder is configured to immediately start recording by pressing the recording start switch again while the recording stop mode is set for tape loading. After a certain time (approximately 5 minutes) after being set as the mode, it is converted into the auto stop mode and unloads the tape and cuts off the power supply to all circuit parts except the internal microcomputer. Therefore, even when recording stop mode, power is supplied to almost all circuit parts, and unnecessary power consumption is generated. When the recording stop mode is set in the state of switching to the above automatic stop mode, tape loading is performed again. It was inconvenient to set the recording time for quick recording of the video.

An object of the present invention is to solve the above drawbacks, when pressing the stand-by mode switch according to the present invention (TOUCH) in the recording stop mode of the video tape recorder, the recording tape is loaded as it is. Is switched to the "stand-by" state where power is supplied to almost all circuits except the microcomputer and function display circuit.If you want to record in this state, press the standby mode switch again to return to the recording stop mode. Since the recording function is performed by the recording start switch afterwards, the power consumption in the recording stop mode can be reduced to the maximum and the recording preparation time can be shortened for quick recording of a desired screen. Hereinafter will be described in detail by the accompanying drawings the configuration and effect of the present invention And the like.

In a video tape recorder circuit comprising a system control microcomputer (3) and a key matrix (1), a drive control unit (2), a function display unit (4), a mode setting encoder unit (5), and a power supply control unit (7), Standby mode switch (SW) for inputting the standby setting circuit to the stand-by setting signal input terminal (IN) of the microcomputer (3), and the standby setting signal output terminal of the microcomputer (3) by the stand-by setting signal input ( NAND gate ND for inverting the standby mode signal level output to OUT), the output of the NAND gate ND, and the standby setup signal through the standby mode switch SW are the two input signals. The output is input to the standby signal input terminal SB of the microcomputer 3, and thus the microcomputer 3 stands by the or gate OR to control the power on / off signal output to the normal power controller 7. By-mode setting (6) was configured.

Unexplained symbols R₁R is resistor, C is capacitor, Vcc, Vcc´ is DC power terminal, RL is power supply control relay, A, B, a and b are relay coils and contacts, NT ₁ , NT₂: inverter, PN PF is a power on / off signal output terminal of the microcomputer 3.

First, when power is supplied to the microcomputer 3, the power supply of all circuit parts except the key matrix 1 and the function display unit 4 is in a state of being interrupted by the relay RL in the power control unit 7. At this time, when the user presses the power switch PWR in the key matrix 1, the output of the terminal PN (PF) of the microcomputer 3 becomes "high" and "low" level pulses, thereby inverting the inverter NT₂. ) Output is the "low" level pulse, and the output of the inverter (NT₁) becomes the "high" level pulse, so that the relay coil (A) of the relay RL is driven so that the Vcc 'power supply is connected via the contact point (a). Supplied to each circuit part, the microcomputer 3 performs the stop mode first by grasping the direct output state with 3 bits of the encoder part 5.

In this state, when the recording switch REC and the playback switch PLAY are pressed together in the key matrix 1, the microcomputer 3 drives the function display unit 4 to display it, and then the encoder unit 5 The drive control unit 2 is controlled to load the video tape into the video head unit until a 3-bit recording stop mode signal is output.

In addition, the microcomputer 3 operates the drill moder through the drive control unit 2, opens the camera aperture, and displays the recording stop mode through the display unit 4. When the operation is completed, the recording stops immediately. There is a mode.

At this time, the standby mode signal outputted to the stand-by setting signal output terminal OUT of the microcomputer 3 is at the "low" level, and the output of the NAND gate ND is at the "high" level. The output also becomes a "high" level and is input to the stand-by signal input terminal SB of the microcomputer 3.

After a certain time as described above in the recording stop mode, the microcomputer 3 goes to the auto stop mode. In this case, the microcomputer 3 unloads the tape loaded in the video head unit through the drive control unit 2. The camera iris is closed and the camera iris is closed. Therefore, in order to change the recording pause mode, the tape needs to be reloaded. Therefore, it takes a long time until the actual recording function is performed by the recording start switch.

On the other hand, when the user presses the stand-by mode switch SW in the stand-by mode setting unit 6 once in the recording pause mode as described above, the microcomputer 3 outputs a "high" level pulse to its input terminal IN. When the input terminal IN is brought back to the "low" level as shown in the algorithm of FIG. 2, it outputs the "high" level to the standby setting signal output terminal OUT. Therefore, the output of the NAND gate ND is at the "low" level, whereby the output of the or gate OP is also at the "low" level, so that the standby signal input terminal SB voltage of the microcomputer 3 is also "low". "You can also level.

In this way, when the terminal SB of the microcomputer 3 is at the "low" level, all input / output terminals have a high impedance due to the characteristics of the microcomputer 3, and the contents of the built-in RAM can be saved. Since almost all functions are stopped, the current consumption is greatly reduced from about 4mA at the time of recording to about 1NA.

At the same time, the "high" level pulse is supplied to the terminal PF of the microcomputer 3 before the standby setting signal output terminal OUT of the microcomputer 3 becomes the "high" level. When the output of the inverter NT 'becomes a "low" level pulse to drive the coil B of the relay RL, the Vcc power source is cut off when connected to the relay contact b and supplied to each circuit part.

In such a state, when the stand-by mode switch SW in the stand-by mode setting unit 6 is pressed again, the "high" level pulse is inputted again to the input terminal IN of the microcomputer 3, whereby The "high" level pulse is output to the output terminal of the gate OR and input to the standby signal input terminal SB of the microcomputer 3, which is then reduced back to the recording pause mode by performing the algorithm described above. After that, the recording start switch is operated.

As described above, the present invention switches the stand-by mode by pressing the stand-by mode switch once during recording pause mode, and when the stand-by mode switch is pressed again in this state, the stand-by mode switch is pressed again. It is a useful design that is convenient to use and minimizes power consumption because it is prevented from being automatically reduced to the stop mode after a certain time delay from the recording pause mode by switching to the recording pause mode.

Claims (1)

In a video tape recorder circuit comprising a microcomputer (3) and a key matrix (1) drive control unit (2), a function display unit (4), a mode setting encoder unit (5), and a power supply control unit (7) for system control. Standby mode switch (SW) for inputting the stand-by setting signal to the stand-by setting signal input terminal (3) of (3), and the stand-by setting signal output terminal (OUT) of the microcomputer (3) by the stand-by setting signal input. NAND gate (ND) for inverting the standby mode signal level outputted to the), the output of the NAND gate (ND) and the standby setup signal through the standby mode switch (SW) of the two input signals and the output It consists of an OR gate which is input to the standby signal input terminal SB of the microcomputer 3, and the microcomputer 3 is output to the normal power control unit 7 by the output of the OR gate OR. Control the power on / off signal So that the video tape recorder characterized by recording order stationary power saving circuit in which the modal.