KR100378806B1 - Running control method for vcr - Google Patents

Abstract

The present invention relates to a technique for detecting an end point using a conventional residual amount detection function or a high-speed search function, rather than using a separate detection device when controlling the running of the cassette tape in V-Cal.

The driving control method of V-Cal according to the present invention rewinds by determining that the lead tape area is reached when the control signal input from the control track is blocked while switching to the high-speed search mode when the remaining amount of the playback tape is not detected. A first process of switching to a mode; When the remaining amount of tape is detected, the lead tape area is reached when the control signal input from the control track is blocked while driving the tape in the forward high speed driving mode to the near end of the reel pulse based on the reel pulse. A second process of switching to the rewind mode after determining that the operation is completed; When the rewind mode is set, it drives in the reverse direction based on the reel pulse to the near end of the tape, and then switches to the high-speed search mode and determines that the lead tape area is reached when the control signal input from the control track is blocked. This is accomplished by a third process of stopping the operation.

Description

RUNNING CONTROL METHOD FOR VCR}

The present invention relates to a technique for controlling the running of the tape by detecting the end point of the cassette tape in V-Cal, and in particular, to control the running by detecting the end point of the tape using another existing function without using a separate detection device. A driving control method of V-Cal to be suitable.

FIG. 1 is a block diagram of a driving control device of a VR in the prior art, for detecting the end points of cassette tapes using the light emitting diodes LED1 and the light receiving transistors Q1 and Q2. An end point sensor unit 11; A winding reel sensor unit 12 and a supply reel sensor unit 13 for generating respective reel pulses SRP and TRP corresponding to the rotational speeds of the winding reel and the supply reel for detecting the remaining amount of the tape; In order to perform functions such as playback, recording, and high-speed search according to a user's request, a microcomputer controlling the running of the tape while referring to the output signals of the respective sensor units 11, 12, and 13 ( 14); The drum motor driver 15 for driving the drum motor under the control of the microcomputer 14 and the capstan motor driver 16 for driving the capstan motor will be described.

When the cassette tape is inserted into the deck of the V-Cal and travels, the running tape travels between the light receiving transistors Q1 and Q2 provided at a predetermined distance from the light emitting diode LED1. However, the leader portion, which is one of both ends of the tape, and the termination portion, which is the other portion, are made of a transparent material.

Therefore, when traveling starts from the leader portion of the tape, the light projected from the light emitting diode LED1 while the leader portion travels between the light emitting diode LED1 and the light receiving transistors Q1 and Q2 is the leader. The light incident transistors Q1 and Q2 are incident through the portions, whereby the light receiving transistors Q1 and Q2 are turned on, so that the power supply terminal voltage VCC is applied to them to the sensing port of the microcomputer 14, respectively. SS) and (TS). That is, a "high" signal is input to the sensing ports SS and TS of the microcomputer 14, respectively.

Thereafter, since the light projected from the light emitting diode LED1 is blocked by the tape, the light receiving transistors Q1 and Q2 are turned off, and thus the sensing ports SS and TS of the microcomputer 14 are turned off. Are inputted to the " low " signals respectively.

After that, when all the tape wound on the supply reel is driven to the winding reel side, since the end portion of the supply reel-side tape is processed transparently as described above, the transistor Q1 is turned on according to the same principle as above, and thereby the micro A "high" signal is input to the sensing port SS of the computer 14. Accordingly, the microcomputer 14 recognizes that the current end portion is detected and controls the capstan motor driving unit 16 to automatically drive the tape in the rewind mode.

Thereafter, the reader portion is again positioned between the light emitting diode LED1 and the transistor Q2 at the moment when the rewinding operation is completed. Therefore, the reader portion of the microcomputer 14 is “high” according to the above principle. Signal is input, the microcomputer 14 controls the capstan motor driving unit 16 to stop the tape from running.

As described above, in the conventional driving control technology of VAL, the end point of the cassette tape is detected by using an optical sensor composed of one light emitting diode and two light receiving transistors. The output will be lowered.

For this reason, when the cassette tape is ejected, the "high" signal is not supplied to the microcomputer through the two light receiving transistors, which causes the alarm to operate so that the user cannot insert the cassette tape into the VRC deck. This occurred.

Accordingly, the first object of the present invention is to run the V-CAL which detects the end points of the cassette tape and controls the running of the reproducing tape by using the normal remaining amount detection function and the high-speed search function without using a separate detection device. To provide a control method.

A second object of the present invention is to provide a V-Cal running control method which detects the end points of cassette tapes by using a normal residual amount detection function and controls the running of a blank tape in which no signal is recorded.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram of a driving control device of a VR in the prior art.

2 is a block diagram of a V-C is applied to the driving control method of the present invention.

3A is a signal flowchart of a first embodiment of a traveling control method of the present invention;

3B is a signal flowchart of a second embodiment of a traveling control method of the present invention;

*** Description of the symbols for the main parts of the drawings ***

21: Capstan motor drive control unit 22: Drum motor drive control unit

23: winding reel sensor unit 24: supply reel sensor unit

25: playback unit

26: microcomputer

The running control method of the reproducing tape for achieving the first object of the present invention is to eject the cassette when the remaining amount of the reproducing tape is not detected, or to switch to the high-speed search mode if it is set to the forward fast driving mode (FF). A first step (SA1-SA12) of switching to the rewind mode (REW) by determining that the lead tape area is reached when the control signal input from the control track is blocked while driving; When the remaining amount of the tape for playback is detected, when the control signal input from the control track is blocked while driving the tape in the forward high speed driving mode (FF) to the near end based on the reel pulse and then switching to the high speed search mode, the lead tape A second process (SA13-SA19) for determining that the area has been reached and switching to the rewind mode (REW); When the rewind mode (REW) is set, it is determined that the lead tape area is reached when the control signal input from the control track is blocked while driving at high speed in the reverse direction to the end of the reel pulse based on the reel pulse. The third step (SA20-SA24) to stop the driving operation is made.

In addition, the traveling control method of the empty tape for achieving the second object of the present invention is similar to the traveling control method for achieving the first object, but traveling at a standard speed near the end without using a control pulse and then reeling The difference is that when the pulse is not input for more than a predetermined time, it is determined that one end of the tape has been reached, and it is switched to the rewind mode REW or stops running.

2 is a block diagram of a V-C to which the traveling control method of the present invention is applied, and as shown therein, a capstan motor drive control unit 21 for controlling the driving of a capstan motor under the control of a microcomputer 26 to be described later; A drum motor drive control unit 22 for controlling the drive of the drum motor under the control of the microcomputer 26; A winding reel sensor unit 23 for outputting a pulse corresponding to the number of rotations of the winding reel by using a rotary encoder mounted on the drive shaft of the winding reel; A supply reel sensor unit 24 for outputting a pulse corresponding to the rotational speed of the supply reel by using a rotary encoder mounted on the drive shaft of the supply reel; A reproducing section (25) for reproducing the signal read out from the tape under the control of the microcomputer (26); The remaining amount of the tape is detected based on the reel pulses output from the reel sensor units 23 and 24, and the end of the tape is determined based on whether the control signal is detected in the high-speed search mode to control the running of the tape. It will be described in detail with reference to Figures 3a and 3b attached to the operation of the present invention configured as a microcomputer 26, as follows.

First, a process for the case where a blank tape in which no signal is recorded is inserted into a deck of a VRC is described with reference to FIG. 3A.

When the cassette is inserted into V-Cal's tech, the microcomputer 26 checks whether or not a control signal is recorded in the control track under the cassette tape in the VV mode, and based on this, the cassette tape currently inserted is processed. It is determined whether the tape is a tape (for example, a playback tape) on which a signal is recorded (SA1-SA3).

If the cassette tape currently inserted is found to be a playback tape, the remaining amount of the tape is checked. If the remaining amount is not detected, the following error message is output. "Cannot check the remaining amount of tape. Please check whether it is a standard tape." (SA4, SA5)

After that, if the cassette is ejected and found to be ejected, it is returned to its initial state, and if it is not ejected, the tape driving direction is checked by checking the driving direction of the tape and in the forward fast driving mode (FF), the capstan motor driving control unit 21 is used. By controlling the driving of the motor, the tape runs at three times the speed (FR × 3) of the standard playback speed and switches to the high-speed search mode where no screen signal is output. (SA6-SA11)

For reference, since a signal is recorded on the reproduction tape, the control signal recorded on the control track can be read in the high speed search mode at the triple speed as described above.

Thereafter, when the tape continues to run and reaches the terminal lead tape area, there is no magnetized signal, so that the control signal cannot be read. Therefore, when the control signal is input in the high-speed search mode but not input for more than a predetermined time, it is determined that one end of the tape is reached and the tape stops running and switches to the automatic rewind mode (REW).

However, when the remaining amount is detected as a result of the remaining amount check in the fourth step SA4, the running direction of the tape is checked, and if it turns out to be the positive direction, the rotary encoder of the winding reel sensor unit 23 or the supply reel sensor unit 24 is checked. Based on the output reel pulse, the remaining amount of tape is checked to maintain the forward high speed driving mode (FF) until it is within a predetermined value (for example, 4 minutes [4 min]), and then the capstan motor driving control unit ( 21) to control the capstan motor to switch to the high-speed search mode (SA13-SA18).

Thereafter, when the tape continues to run and reaches the lead tape region at the end, the control signal is not input as described above. Based on this, the control signal is determined to have reached the end, and the tape runs as in the twelfth step SA12. Stop and switch to automatic rewind mode (REW) (SA19)

On the other hand, as a result of the remaining amount check in the thirteenth step SA13, the remaining amount is detected, and as a result of checking the running direction of the tape, it is found to be in the reverse direction and switched to the rewind mode REW, or the twelfth step SA12 or the nineteenth step. After switching to the rewind mode (REW) in (SA19), the current tape remaining amount is continuously checked based on the reel pulse output from the rotary encoder while maintaining the mode (REW), and within a predetermined value (4 min). Is changed to the 3x high speed search mode as described above. (SA20-SA23)

Thereafter, when the tape further travels and reaches the end of the lead tape region, the control signal is not input as described above. At this time, it is determined that the lead end is reached and the driving operation of the tape is completely stopped. (SA24)

On the other hand, if it is determined in the third step SA3 of FIG. 3A that the cassette tape currently inserted is a blank tape in which no signal is recorded, the process is performed as in FIG. 3B.

If the remaining amount of tape is not checked and the remaining amount is not detected, an error message is output, and if the cassette is not ejected and is found to be in the forward fast driving mode (FF), the capstan motor driving control unit 21 controls the driving of the capstan motor to control the tape. Is driven at the standard speed FR × 1, and then, when the interruption time of the reel pulse inputted from the supply reel sensor unit 24 lasts for a predetermined time (for example, 1 second), it is switched to the rewind mode (REW). (SB1-SB8)

However, when the remaining amount of tape is detected in the above, the remaining amount of the tape is checked based on the reel pulse, and the forward fast driving mode FF is maintained until the remaining amount of the tape is within a predetermined value (for example, 1 minute [1 min]). The next tape is driven at the standard speed (FR × 1). After that, if the interruption time of the reel pulse input from the supply reel sensor unit 24 lasts for a predetermined time (for example, 1 second), the current driving mode is rewinded. Switch to (REW). (SB9-SB14)

On the other hand, as a result of the remaining amount check, the remaining amount is detected, but as a result of checking the running direction of the tape, it is found to be in the reverse direction and is switched to the rewind mode (REW), or has already been rewound in the eighth step (SB8) or the fourteenth step (SB14). After switching to REW), the mode (REW) is maintained, and then the tape is driven at the standard speed (FR × 1) when the remaining amount of the tape turns out to be a constant value (1 min) based on the reel pulse. After that, when the cutoff time of the reel pulse input from the winding reel sensor unit 23 lasts for a predetermined time (for example, 1 second), the driving operation of the tape is completely stopped. (SB15-SB19)

As a result, since the blank tape does not have a magnetized signal, it is impossible to use the search mode at the triple speed as shown in FIG. 3A. Therefore, at this time, the driving is controlled while checking the remaining amount of the tape based on the reel pulse output from the rotary encoder of the winding reel sensor unit 23 or the supply reel sensor unit 24. Other points are that the driving speed is changed to the standard speed (FR × 1) when the end portion is reached by performing the forward high speed driving or rewinding, and the time when the reel pulse is not output from both ends of the tape (for example, When it lasts longer than 1 second), the tape stops running or switches to the rewind mode.

For reference, the EE mode refers to a mode for processing air signals such as a broadcast signal in the V-Call, VV mode means a signal processing mode other than that.

As described in detail above, the present invention enables to control the running of the tape by detecting the end points of the cassette tape by using the existing remaining amount detection function and the high-speed search function without using a separate detection device. This can prevent malfunction due to aging and reduce the cost.

Claims (6)

A first step of switching to the rewind mode by determining that the lead tape area is reached when the control signal input from the control track is interrupted while switching to the high speed search mode when the remaining amount of the playback tape is not detected; When the remaining amount of tape is detected, the lead tape area is reached when the control signal input from the control track is blocked while driving the tape in the forward high speed driving mode to the near end of the reel pulse based on the reel pulse. A second process of switching to the rewind mode after determining that the operation is completed; When the rewind mode is set, it drives in the reverse direction based on the reel pulse to the near end of the tape, and then switches to the high-speed search mode and determines that the lead tape area is reached when the control signal input from the control track is blocked. Running control method of V-Cal comprising a third step of stopping the operation. The method of claim 1, wherein the high-speed search mode is three times the standard travel speed and does not output a screen signal. The method of claim 1, wherein the vicinity of the terminal is a point about 4 minutes before the terminal. A first step of switching to the rewind mode when the reel pulse input from the supply reel is blocked for a predetermined time while running the tape at a standard speed if the remaining amount of the empty tape on which no signal is recorded is detected; When the remaining amount of the empty tape is detected, the tape is driven in the forward high speed driving mode to the end of the reel based on the reel pulse, and the tape is driven at the standard speed while the reel pulse input from the supply reel is cut off for a predetermined time. A second process for switching; A third step of stopping the driving operation when the reel pulse input from the winding reel is interrupted for a predetermined time while driving the tape at a normal speed in the reverse direction based on the reel pulse, and driving the tape at a high speed in the reverse direction to the end of the tape. Running control method of V-Cal characterized in that consisting of. The method of claim 4, wherein the standard speed is the same speed as the tape travel speed in the normal playback mode. The method of claim 4, wherein the predetermined time is 1 second.