JPH0536154A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent erasing of a recorded part or occurrence of at unrecorded part by regenerating a magnetic tape with a time code regenerating means when a recording switch is pressed under a recording stop mode and shifting this mode to a recording mode after the obtained time code value coincides with a value of a storage means. CONSTITUTION:When a recording key 101 is pressed under the stop mode, recording key on-information is inputted from a key input circuit 103 to a mode setting circuit 104. Thus, a command is issued by the circuit 104 to a motor control circuit 105 to travel the tape under a reproducing mode. A time code recorded on the tape is regenerated by a time code regenerating circuit 108, and this is compared with a time code data stored in a storage circuit 109 by a comparision circuit 110. When both the data are equal, a detecting signal is inputted to the circuit 104, and the command of the tape traveling under the recording mode is issued by the circuit 104 to the control circuit 105, and also a recording command is outputted to a video signal processing circuit 106. By this method, the VTR is started to operate under the recording mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a magnetic recording / reproducing apparatus for recording whose main purpose is recording.

[0002]

2. Description of the Related Art In recent years, commercial VTRs have been marketed, and until now they were used only indoors, but they are becoming smaller and lighter, and recording for outdoor shooting by connecting with a camera. Portable VTRs for cameras and camera recorders integrated with cameras have been commercialized.

The continuous shooting operation of the conventional portable VTR will be described below. FIG. 9 shows this conventional portable VT.
It is a schematic block diagram of the part regarding the continuous shooting of R. 901
Is a recording key, 902 is a stop key, 903 is a key input circuit, 904 is a mode setting circuit, 905 is a motor control circuit, and 906 is a video signal processing circuit. Key input circuit 9
03 is ON / O of the record key 901 and the stop key 902.
The FF is detected, and ON / OFF information of these keys is output to the mode setting circuit 904. The mode setting circuit 904 sets the operation mode of the VTR based on the key ON / OFF information from the key input circuit, and outputs a mode command signal to the motor control circuit 905 and the video signal processing circuit 906. The motor control circuit 905 controls the operation mode of each motor based on this mode command. Video signal processing circuit 90
Reference numeral 6 switches the operation mode of the video signal processing circuit based on this mode signal.

FIG. 10 is an operation explanatory view for explaining the operation of the circuit shown in FIG. FIG. 10A shows the operation of shifting from the recording (REC) mode to the stop (STOP) mode by pressing the stop key (STOP KEY) in the recording mode. FIG. 10B shows a continuous shooting operation in which the recording key (REC KEY) is pressed in the stop mode to shift from the stop mode to the recording mode again. 1001 is a magnetic tape.

The operation of the continuous shooting control device of the VTR having the above structure will be described below.

First, when the stop key 902 is pressed while operating in the recording mode, the stop key O is pressed by the key input circuit 903.
When N is detected, the stop key ON information is output from the key input circuit 903 to the mode setting circuit 904. When the stop key ON information is input, the mode setting circuit 904 outputs a tape stop command signal to the motor control circuit 905, and then outputs a tape rewind command signal. Similarly, when the stop key ON information is input, the mode setting circuit 904 outputs a recording stop command to the video signal processing circuit 906.

Next, the record key is pressed from the stop mode,
When the recording key ON is detected by the key input circuit 903, the recording key O is transferred from the key input circuit 903 to the mode setting circuit 904.
N information is output. When the recording key ON information is input, the mode setting circuit 904 outputs a tape running command signal in the reproducing mode for a predetermined time to the motor control circuit 905, and then outputs a tape running command signal in the recording mode. Similarly, in the mode setting circuit 904, the recording key O
When N information is input, a normal reproduction command is output to the video signal processing circuit 906 for a predetermined time, and then a signal recording command is output.

FIG. 10 shows the state of this operation on the magnetic tape 1001. FIG. 10A shows the operation of shifting from the recording (REC) mode to the stop (STOP) mode by pressing the stop key (STOP KEY) in the recording mode. As shown in the drawing, when STOP KEY is pressed in the recording mode, the magnetic tape 1001
After being stopped, it is rewound by the length L1 to enter the stop mode. FIG. 10B shows the recording key (RE
C KEY) is pressed, and the continuous shooting operation for shifting from the stop mode to the recording mode again is shown. As shown in the figure, when REC KEY is pressed in the stop mode, the magnetic tape 1001 is fed by the length L2 in the reproduction mode, and after the phase control of the capstan motor (not shown) is pulled in, the recording mode is set. Transition.

[0009]

However, in the above-mentioned conventional configuration, the tape rewind length L1 when the recording mode is changed to the stop mode, and the normal reproduction tape when the stop mode is changed to the recording mode. The running length L2 is
It depends on the tape rewinding time T1 and the running time T2 in the normal reproduction mode, respectively. Here time T1, T2
Is set so that the tape length L1> L2 is generally set so that an unrecorded portion does not occur in the continuous shooting portion.
The signal already recorded in the area A (corresponding to the length of L1-L2) in FIG. 10B has a problem that it is erased by recording a new signal by continuous shooting. Was there.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a magnetic recording / reproducing apparatus which prevents erasure of a recording portion by continuous shooting and prevents tape damage in a stop mode.

[0011]

In order to achieve this object, a magnetic recording / reproducing apparatus of the present invention comprises a time code recording means, a time code reproducing means, and a time code recording means on a magnetic tape in a recording mode. Time code storage means for storing the recorded time code value at a predetermined timing, a playback time code value output from the time code playback means in the playback mode, and a time code stored in the time code storage means. , And a switch input means for detecting ON / OFF of the recording switch and the stop switch, output information of the switch input means, and the time code comparison means. A mode for setting the operation mode of the magnetic recording and reproducing device based on the detection signal output from the And de setting means, and a mode command signal outputted from said mode setting means has a structure consisting of a motor control means for controlling the motor based on.

[0012]

According to the present invention, the time code reproducing means reproduces the magnetic tape when the mode setting means shifts from the recording stop mode to the recording mode when the recording switch is pressed in the recording stop mode. Until the value of the obtained time code matches the value of the time code stored in the storage means, a reproduction mode command is output from the mode setting means, and the time code reproduction means reproduces the magnetic tape to obtain it. After the value of the time code matches the value of the time code stored in the storage means, the recording mode command is output from the mode setting means. In this way, it is possible to prevent the already recorded signal from being erased or to prevent the unrecorded portion from occurring in the continuous shooting portion.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram of a magnetic recording / reproducing apparatus according to the first embodiment of the present invention. In FIG. 1, 101 is a recording key and 102 is a stop key, which are input to the key input circuit 103, respectively. Key input circuit 103
ON / OFF of the record key 101 and the stop key 102
Is detected and ON / OFF information of these keys is output to the mode setting circuit 104. 104 is a mode setting circuit,
The operation mode of the VTR is set based on the key ON / OFF information from the key input circuit 103 and the detection signal output from the comparison circuit 110 described later, and the mode command signal is sent to the motor control circuit 105 and the video signal processing circuit. 106
Output to. The motor control circuit 105 controls the operation mode of each motor based on this mode command. The video signal processing circuit 106 switches the operation mode of the video signal processing circuit based on the mode command. Reference numeral 107 is a time code recording circuit including a time code generating circuit, and 108 is a time code reproducing circuit for processing a reproduction time code. A storage circuit 109 stores the time code value recorded on the magnetic tape by the time code recording circuit 107 at a predetermined timing. Reference numeral 110 denotes a comparison circuit, which detects whether or not the value of the time code stored in the storage circuit 109 and the value of the time code output from the time code reproduction circuit 108 match and outputs a detection signal when they match. It is output to the mode setting circuit 104.

FIG. 2 is an operation explanatory view for explaining the operation of the circuit shown in FIG. FIG. 2A shows that when the stop key (STOP KEY) is pressed in the recording mode and the recording (RE
The operation of shifting from the C) mode to the stop (STOP) mode is shown. FIG. 2B shows the recording key (R
(EC KEY) is pressed, and the continuous shooting operation for shifting from the stop mode to the recording mode again is shown. 201 is a magnetic tape.

The VTR of this embodiment constructed as described above
The operation of the continuous shooting control device will be described below.

First, when the stop key 102 is pressed while operating in the recording mode, the stop key O is pressed by the key input circuit 103.
When N is detected, the stop key ON information is output from the key input circuit 103 to the mode setting circuit 104. When the stop key ON information is input, the mode setting circuit 104 outputs a tape stop command signal to the motor control circuit 105, and then outputs a tape rewind command signal. Similarly, when the stop key ON information is input, the mode setting circuit 104 outputs a recording stop command to the video signal processing circuit 106. Further, in the mode setting circuit 104, when the stop key ON information is input, a time code storage command signal is output to the storage circuit 109, and the storage circuit 109 causes the time code recording circuit 1 to operate.
At 07, the time code of the last frame recorded on the magnetic tape is stored.

Next, in the stop mode, the recording key 101
When is pressed and the record key ON is detected by the key input circuit 103, the record key ON information is output from the key input circuit 103 to the mode setting circuit 104. Mode setting circuit 104
Then, when the recording key ON information is input, the tape drive command signal in the reproduction mode is output to the motor control circuit 105. The time code reproduction circuit 108 reproduces the time code recorded on the magnetic tape, and the reproduced time code data is compared by the comparison circuit 110 to determine whether or not it matches the time code data stored in the storage circuit 109. Done. In the comparison circuit 110, when the reproduction time code data and the time code data stored in the storage circuit 109 match, a detection signal is output, and when the detection signal is input to the mode setting circuit 104, the mode setting circuit 104 outputs a tape running command signal in the recording mode to the motor control circuit 105, and the mode setting circuit 104 outputs a video signal recording command signal to the video signal processing circuit 106. This allows the VTR
Operates in record mode.

As described above, according to this embodiment, when the continuous shooting operation is performed, the storage means for storing the time code corresponding to the final recording frame is provided, and when the continuous shooting operation is performed, the reproduction operation is performed first. By controlling the timing of switching to the recording mode in the continuous shooting operation, by reproducing the already recorded part of the magnetic tape and providing a comparison means for comparing the value of the reproduction time code with the value of the time code stored in the storage means. Therefore, in the continuous shooting part, the already recorded video signal is erased, and on the contrary, the unrecorded part does not remain in the continuous shooting part, and the continuous shooting in a complete form is realized. The effect of being able to do is obtained.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a schematic block diagram of a magnetic recording / reproducing apparatus according to the second embodiment of the present invention. In FIG. 3, the components having the same numbers as those in the schematic configuration diagram shown in FIG. 1 perform the same operations as the components described in the first embodiment of the present invention. In FIG. 3, 101
Is a recording key, and 102 is a stop key, which are input to the key input circuit 103. The key input circuit 103 is the recording key 1
01 and the ON / OFF of the stop key 102 are detected, and the ON / OFF information of these keys is detected by the mode setting circuit 302.
Output to. A mode setting circuit 302 operates the VTR based on the key ON / OFF information from the key input circuit 103, the detection signal output from the comparison circuit 110 described later, and the timer signal output from the standby-off timer circuit 301. The mode is set and the mode command signal is sent to the motor control circuit 105 and the video signal processing circuit 106.
Output to. The motor control circuit 105 controls the operation mode of each motor based on this mode command. The video signal processing circuit 106 switches the operation mode of the video signal processing circuit based on the mode command. Reference numeral 107 is a time code recording circuit including a time code generating circuit, and 108 is a time code reproducing circuit for processing a reproduction time code. A storage circuit 109 stores the time code value recorded on the magnetic tape by the time code recording circuit 107 at a predetermined timing. Reference numeral 110 denotes a comparison circuit, which detects whether or not the value of the time code stored in the storage circuit 109 and the value of the time code output from the time code reproduction circuit 108 match and outputs a detection signal when they match. It is output to the mode setting circuit 302. The standby off timer circuit 301 operates when the magnetic tape stop state is set in the mode setting circuit 302, and if the tape stop state continues for a set time or longer, the standby off timer circuit 301 is set to set the standby off mode. A standby off timer completion signal is output from the mode setting circuit 302 to the mode setting circuit 302 and the motor control circuit 1
05 and the video signal processing circuit 106, a standby off command signal is output.

FIG. 4 is an operation explanatory view for explaining the operation of the circuit shown in FIG. FIG. 4A shows that the stop key (STOP KEY) is pressed in the recording mode. When the stop key is pressed in the recording mode, the mode setting circuit 302 stops recording and rewinds the magnetic tape 401, so that the motor control circuit 105 and the video signal processing circuit 1
A command signal is output to 06.

When the magnetic tape 401 is rewound by a predetermined amount,
A stop command is output from the mode setting circuit 302 to the motor control circuit 105, and the VTR enters the STOP mode ((b) in the figure).

In the STOP mode, the mode setting circuit 302 outputs a stop command to the motor control circuit 105 and a standby off timer operation command to the standby off timer circuit 301.

The standby off timer circuit 301 operates while the mode setting circuit 302 outputs the tape stop command, and outputs a standby off timer completion signal to the mode setting circuit 302 after a predetermined time has elapsed.
When the mode setting circuit 302 inputs the standby off timer completion signal, the operation mode of the VTR becomes the standby off state ((c) in the figure), and the mode setting circuit 302 causes the motor control circuit 105 and the video signal processing circuit 106 to operate.
The standby off command is output to. In the standby-off state, for example, the motor control circuit 105 controls the reel motor so that tension is not applied to the magnetic tape 401, and the video signal processing circuit 106 stops the power supply to the circuit.

When the record key (REC KEY) is pressed in the standby off state, the key input circuit 103
The information that the recording key 101 has been turned on is input to, and the mode setting circuit 302 sets the operation mode of the VTR from the standby off state to the reproduction mode based on the output signal of the key input circuit 103. In playback mode,
If the reproduction time code value is the same as the time code value stored in the storage circuit 109, the mode setting circuit 3
02 shifts the operation mode of the VTR from the reproduction mode to the recording mode based on the output signal of the comparison circuit 110 ((d) in the same figure).

A second embodiment of the present invention will be described with reference to FIGS. 3 and 4.

First, when the stop key 102 is pressed while operating in the recording mode, the stop key O is pressed by the key input circuit 103.
When N is detected, the stop key ON information is output from the key input circuit 103 to the mode setting circuit 302. In the mode setting circuit 302, when the stop key ON information is input, a tape stop command signal is output to the motor control circuit 105, and then a tape rewind command signal is output. Similarly, when the stop key ON information is input, the mode setting circuit 302 outputs a recording stop command to the video signal processing circuit 106. Further, in the mode setting circuit 302, when the stop key ON information is input, a time code storage command signal is output to the storage circuit 109, and the storage circuit 109 causes the time code recording circuit 1 to operate.
At 07, the time code of the last frame recorded on the magnetic tape is stored.

Next, after the magnetic tape is wound by a predetermined amount in accordance with the winding mode command signal output from the mode setting circuit 302 to the motor control circuit 105, the tape is transferred from the mode setting circuit 302 to the motor control circuit 105. A stop command signal is output and the VTR shifts to the STOP mode.

In the STOP mode, the mode setting circuit 3
02, a standby off timer operation command is output to the standby off timer circuit 301, and the standby off timer circuit 301 measures the time T _STOP during which the magnetic tape is stationary. If the STOP mode continues for a predetermined time or more, the measurement time T _STOP of the standby off timer circuit 301 becomes a predetermined value T1 or more, and the standby off timer circuit 301 outputs a timer completion signal.

When the mode setting circuit 302 inputs the timer completion signal, the operation mode of the VTR shifts to the standby off mode, the mode setting circuit 302 outputs the standby off mode command signal to the motor control circuit 105, and the mode setting is performed. A standby off mode command signal is also output from the circuit 302 to the video signal processing circuit 106.

When the motor control circuit 105 receives the standby-off mode command signal, the motor control circuit 105 controls the reel motor so that the torque generated by both reel motors becomes zero so that tension is not applied to the magnetic tape, for example.

Further, when the video signal processing circuit 106 receives the standby off mode command signal, the video signal processing circuit 106 operates, for example, to stop the power supply to the video signal processing circuit.

Recording key 1 in the standby off mode
When 01 is pressed and the recording key ON is detected by the key input circuit 103, the key input circuit 103 causes the mode setting circuit 30
The recording key ON information is output to 2. Mode setting circuit 3
In 02, when the recording key ON information is input, a tape running command signal in the reproduction mode is output to the motor control circuit 105. The time code reproduction circuit 108 reproduces the time code recorded on the magnetic tape, and the reproduced time code data is stored in the storage circuit 109 in the comparison circuit 110.
A comparison is made as to whether it matches the time code data stored in. In the comparison circuit 110, when the reproduction time code data and the time code data stored in the storage circuit 109 match, a detection signal is output, and when the detection signal is input to the mode setting circuit 302, the mode setting circuit 302 outputs a tape running command signal in the recording mode to the motor control circuit 105, and the mode setting circuit 302 controls the video signal processing circuit 106.
The video signal recording command signal is output to. This allows VT
R operates in recording mode.

On the other hand, in the recording mode, the stop key 102
Is pressed, the operation mode of the VTR shifts from the recording mode to the STOP mode via the rewind mode, and when the standby off timer circuit 301 is operating, the measurement time T _STOP of the standby off timer circuit 301 is predetermined. If the recording key 101 is pressed when the value is less than or equal to the value T1 of ST1, as in the first embodiment of the present invention, the ST
After the value of the reproduction time code matches the value of the time code stored in the storage circuit 109 from the OP mode through the reproduction mode, the recording mode is entered.

As described above, according to this embodiment, when the continuous shooting operation is performed, the storage means for storing the time code corresponding to the final recording frame is provided, and when the continuous shooting operation is performed, the reproduction operation is performed first. By controlling the timing of switching to the recording mode in the continuous shooting operation, by reproducing the already recorded part of the magnetic tape and providing a comparison means for comparing the value of the reproduction time code with the value of the time code stored in the storage means. Therefore, in the continuous shooting part, the already recorded video signal is erased, and on the contrary, the unrecorded part does not remain in the continuous shooting part, and the continuous shooting in a complete form is realized. The effect of being able to do is obtained.

Further, if the magnetic tape stop state continues for a certain period of time or more, the standby off mode is entered, so that it is possible to prevent the tape damage of the magnetic tape and reduce the power consumption.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a schematic block diagram of a magnetic recording / reproducing apparatus according to the third embodiment of the present invention. In FIG. 5, 501 is a supply reel (S reel).
Is driven by the supply reel motor (S reel motor) 508. A take-up reel (T reel) 502 is driven by a take-up reel motor (T reel motor) 511. Reference numeral 503 is a rotary head drum on which a rotary magnetic head (not shown) is mounted and is driven to rotate at high speed by a drum motor 509. A capstan shaft 507 is directly driven by a capstan motor 510. 504
Is a pinch roller, and the pinch roller 504 is the magnetic tape 5.
The magnetic tape is transported by being pressed into contact with the capstan shaft 507 with the 06 interposed therebetween. A magnetic tape 506 is drawn from the S reel 501, wound around the rotary head drum 503 via the post 505, and then transferred by the capstan motor 510 and wound around the T reel 502.

The S reel motor control circuit 517 outputs a signal for controlling the drive of the S reel motor 508 to the motor drive circuit 512 in response to the mode command signal output from the mode setting circuit 522.

The T reel motor control circuit 521 outputs a signal for driving and controlling the T reel motor 511 to the motor drive circuit 515 in response to the mode command signal output from the mode setting circuit 522.

The drum motor control circuit 518 responds to the mode command signal output from the mode setting circuit 522 by driving a signal for driving and controlling the drum motor 509 at the rotation speed set by the rotation speed setting circuit 519. Output to the circuit 513.

The capstan motor control circuit 520 outputs a signal for controlling the drive of the capstan motor 510 to the motor drive circuit 514 in response to the mode command signal output from the mode setting circuit 522.

Reference numeral 522 denotes a mode setting circuit which outputs a mode command signal according to the operation mode of the VTR to the motor control circuit 516.
Output to.

The standby off timer circuit 523 operates when the magnetic tape stop state is set in the mode setting circuit 522, and if the tape stop state continues for a set time or longer, the standby off mode is set to set the standby off mode. From the timer circuit 523 to the mode setting circuit 5
A standby off timer completion signal is output to 22 and a standby off command signal is output from the mode setting circuit 522 to the motor control circuit 516.

A third embodiment of the present invention will be described with reference to FIG. First, during operation in the recording / playback mode, the rotation speed setting circuit 519 sets the rotation speed of the drum motor 509 to a high speed rotation such as 5400 rotations per minute based on the mode command signal output from the mode setting circuit 522. The motor control circuit 518 outputs a control signal so that the set speed is achieved.

Next, in the STOP mode, the mode setting circuit 522 outputs a standby off timer operation command to the standby off timer circuit 523, and the standby off timer circuit 523 measures the time T _STOP during which the magnetic tape is stationary. To do. If the STOP mode continues for a predetermined time or longer, the measurement time T _STOP of the standby off timer circuit 523 becomes a predetermined value T1 or more, and the standby off timer circuit 523 outputs a timer completion signal.

When the mode setting circuit 522 inputs the timer completion signal, the operation mode of the VTR shifts to the standby off mode, and the mode setting circuit 522 outputs the standby off mode command signal to the motor control circuit 516.

When the S-reel motor control circuit 517 and the T-reel motor control circuit 521 receive the standby off mode command signal, the torque generated by the S-reel motor and the T-reel motor is set to zero so that tension is not applied to the magnetic tape 506. The reel motor control is performed as described above.

When the standby-off mode command signal is input, the rotation speed setting circuit 519 sets the rotation speed of the drum motor 509 to a low speed rotation such as 900 rotations per minute.

As described above, according to this embodiment, if the magnetic tape stop state continues for a certain time or longer, the standby off mode is entered to prevent the tension from being applied to the magnetic tape and the rotation of the rotary drum. By setting the number to low speed rotation, it is possible to obtain an effect that it is possible to prevent tape damage due to the rotary magnetic head repeatedly running at the same location on the magnetic tape at high speed.

A fourth embodiment of the present invention will be described with reference to FIG. In the figure, components that perform the same operations as those shown in FIG. 5 are assigned the same numbers.

The magnetic tape 506 is housed in the cassette 605, and the loading mechanism 603 is driven by the loading motor 601 at the time of recording / reproducing.
The magnetic tape 506 is pulled out to the running position by setting the post 604 to a regular position for recording / reproducing. Similarly, during operation in the recording / playback mode, the mode setting circuit 6
Based on the mode command signal output from 06, the rotation speed setting circuit 519 sets the rotation speed of the drum motor 509 to 5 per minute.
The drum motor control circuit 518 outputs a control signal so that the speed is set to a high speed such as 400 rotations.

Next, in the STOP mode, a standby off timer operation command is output from the mode setting circuit 606 to the standby off timer circuit 607, and the standby off timer circuit 607 measures the time T _STOP during which the magnetic tape is stationary. To do. If the STOP mode continues for a predetermined time or longer, the measurement time T _STOP of the standby off timer circuit 607 becomes a predetermined value T1 or more, and the standby off timer circuit 607 outputs a timer completion signal.

When the mode setting circuit 606 inputs the timer completion signal, the operation mode of the VTR shifts to the standby off mode, and the mode setting circuit 606 issues a standby off mode command to the drum motor rotation speed setting circuit 519 and the loading motor control circuit 602. The signal is output.

When the standby-off mode command signal is input, the rotation speed setting circuit 519 sets the rotation speed of the drum motor 509 to a low speed rotation such as 900 rotations per minute.

When the loading motor control circuit 602 receives the standby-off command signal, it drives the loading motor 601 in the unloading direction to cause the magnetic tape 5 to move.
Post 6 until the position where 06 does not contact the rotary head drum
The loading mechanism 603 is moved so as to move 04.

As described above, according to the present embodiment, if the magnetic tape stop state continues for a certain time or longer, the standby off mode is entered, and the unloading operation is performed until the magnetic tape does not come into contact with the rotary head drum. In addition, by setting the rotation speed of the rotating drum to low speed, it is possible to prevent thin magnetic tape from being swayed by the air blown from the drum when the rotating drum rotates at high speed.
The effect that the tape damage can be prevented is obtained.

Next, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a schematic block diagram of a magnetic recording / reproducing apparatus according to the fifth embodiment of the present invention. 7, the same elements as those shown in FIG. 1 are designated by the same reference numerals. In FIG. 7, 101 is a recording key and 102 is a stop key, which are key input circuits 1 respectively.
It is input to 03. The key input circuit 103 is the recording key 10
1 and the ON / OFF of the stop key 102 are detected, and ON / OFF information of these keys is output to the mode setting circuit 702. Reference numeral 702 denotes a mode setting circuit, which is a key input circuit 1
Based on the key ON / OFF information from 03, the detection signal output from the comparison circuit 110 described later, and the timer completion signal output from the standby off timer circuit 701, the operation mode of the VTR is set, and the mode command signal is set. Is output.

The reel motor control circuit 703 corresponds to the mode command signal output from the mode setting circuit 702, and the S reel motor 707 and the T reel motor 708.
At the same time that the operation mode is set, a signal for driving and controlling both reel motors is output.

The capstan motor control circuit 704 outputs a signal for setting the operation mode of the capstan motor 709 and drivingly controlling the capstan motor 709 in response to the mode command signal output from the mode setting circuit 702. To do.

The drum motor rotation speed setting circuit 705 is
The rotation speed of the drum motor is set according to the mode command signal output from the mode setting circuit 702, and the drum motor control circuit 706 controls the drive of the drum motor 710 at the rotation speed set by the rotation speed setting circuit 705. The signal of is output.

The standby off timer circuit 701 operates when the magnetic tape stop state is set in the mode setting circuit 702, and if the tape stop state continues for a predetermined time or longer, the standby off mode is set to set the standby off mode. From the timer circuit 701 to the mode setting circuit 7
02, a standby off timer completion signal is output to the mode setting circuit 702, and the reel motor control circuit 703
A standby off mode command signal is output to the capstan motor control circuit 704 and the drum motor rotation speed setting circuit 705.

A fifth embodiment of the present invention will be described with reference to FIGS. FIG. 8 is an auxiliary diagram for explaining the fifth embodiment of the present invention. FIG. 8A shows the mode setting circuit 7
02 shows the mode transition of the operation mode of the VTR set in 02, and (b) shows the drum motor rotation speed setting circuit 7 based on the mode command signal output from the mode setting circuit 702.
The value of the drum motor rotation speed set in 05 (high speed /
Slow).

First, while operating in the recording mode, the rotation speed setting circuit 705 sets the rotation speed of the drum motor 710 to a high speed rotation such as 5400 rotations per minute based on the mode command signal output from the mode setting circuit 702. The drum motor control circuit 706 outputs a control signal so that the set speed is achieved.

Next, in the recording mode, the STOP key 1
When 02 is pressed, a time code storage command is output from the mode setting circuit 702 to the storage circuit 109 based on the stop key ON signal output from the key input circuit 103, and the last image recorded on the magnetic tape. The value of the time code corresponding to the signal is stored in the storage circuit 109.

Similarly, the rewind mode command signal is output from the mode setting circuit 702 based on the stop key ON signal. When the rewind mode command signal is input, the capstan motor control circuit 704 switches the rotation direction so as to rewind the magnetic tape and drives and controls the capstan motor.

When a predetermined time has passed in the rewind mode, the mode setting circuit 702 outputs a stop mode command signal,
The capstan motor control circuit 704 stops the rotation of the capstan motor 709. At the same time, the mode setting circuit 70
A standby off timer operation signal is output from 2, and the standby off timer circuit 701 starts operating.

When a predetermined time elapses after shifting to the stop mode, the standby off timer circuit 701 outputs a timer completion signal, and the mode setting circuit 702 outputs a standby off mode command signal.

When a standby off mode command signal is input to the reel motor control circuit 703, the T reel motor 7
The drive control is performed so that the torque generated by the 07 and S reel motors 708 becomes zero.

Similarly, when a standby off mode command signal is input to the rotation speed setting circuit 705, the rotation speed of the drum motor 710 is set to a low speed rotation of 900 rpm, and the drum motor control circuit 706 sets the rotation speed to the set speed. Output the control signal.

Recording key 1 in the standby off mode
When 01 is pressed, the continuous shooting reproduction mode command signal is output from the mode setting circuit 702 based on the recording key ON signal output from the key input circuit 103. When the continuous shooting reproduction mode command signal is input, the capstan motor control circuit 704 drives and controls the capstan motor so that the magnetic tape runs in the reproduction mode.

When the continuous shooting reproduction mode command signal is input to the reel motor control circuit 703, the T reel motor 70
7 and the S reel motor 708 are controlled to operate in the reproduction mode.

Similarly, when the continuous shooting reproduction mode command signal is input to the rotation speed setting circuit 705, the drum motor 7
The rotation speed of 10 is set to a high speed of 5400 rotations per minute, and the drum motor control circuit 706 outputs a control signal so that the set speed is reached.

In the continuous shooting reproduction mode, if the value of the time code reproduced by the time code reproduction circuit 108 in the comparison circuit 110 matches the value of the time code stored in the storage circuit 109, the detection signal from the comparison circuit 110 is output. Then, the mode setting circuit 702 shifts the operation mode of the VTR to the recording mode.

As described above, according to this embodiment, if the magnetic tape stop state continues for a certain time or longer, the standby off mode is entered so that tension is not applied to the magnetic tape and the rotation of the rotary drum is prevented. By setting the number to low speed rotation, it is possible to obtain an effect that it is possible to prevent tape damage due to the rotary magnetic head repeatedly running at the same location on the magnetic tape at high speed.

Further, according to this embodiment, when the continuous shooting operation is performed, the storage means for storing the time code corresponding to the final recording frame is provided, and when the continuous shooting operation is performed, the magnetic tape is first reproduced by the reproducing operation. By reproducing the already recorded portion of the, and providing a comparison means for comparing the value of the reproduction time code with the value of the time code stored in the storage means, the timing of shifting to the recording mode in the continuous shooting operation is managed, In the continuous shooting portion, there is an effect that the already recorded video signal is not erased and continuous shooting can be realized in a complete form.

According to the present embodiment described above, the rewinding amount L1 (mm) of the magnetic tape in the rewinding mode of the sixth aspect.
Is the time required for the drum motor to rise from the low speed rotation set in the standby off mode to the normal rotation speed in the recording mode T1 (sec), and the tape running speed V1 (mm / se in the continuous shooting reproduction mode).
In the case of c), if L1> T1 × V1 is set, the drum motor rises to the normal rotation speed in the recording mode and then shifts to the recording mode. Therefore, no unrecorded portion remains in the continuous shooting portion. The effect of being able to realize continuous shooting in perfect form is obtained.

[0077]

As described above, according to the present invention, the time code recording means, the time code reproducing means, the mode setting means for setting the operation mode of the magnetic recording / reproducing apparatus, the recording switch and the stop switch are inputted, and the mode is set. Switch input means for outputting switch input information to the setting means; and when the stop switch is pressed in the recording mode, the time code recording means causes the time code recording means to write the magnetic tape on the magnetic tape immediately before the mode is changed to the recording stop mode in the mode setting means. Storage means for storing the value of the recorded time code, and tape rewinding means for rewinding the magnetic tape by a predetermined amount by a rewinding command signal output from the mode setting means when the recording mode is changed to the recording stop mode. By providing
The value of the time code obtained by reproducing the magnetic tape by the time code reproducing means when the recording mode is changed from the recording stop mode to the recording mode by the mode setting means when the recording switch is pressed in the recording stop mode is the storage means. The reproduction mode command is output from the mode setting means until the time code value matches the time code value stored in, and the time code value obtained by reproducing the magnetic tape by the time code reproduction means is stored in the storage means. After matching the value of the generated time code, the recording mode command is output from the mode setting means. In this way, it is possible to prevent the already recorded signal from being erased or to prevent the unrecorded portion from occurring in the continuous shooting portion.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is an operation explanatory diagram for explaining the operation of the circuit shown in FIG.

FIG. 3 is a schematic configuration diagram of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 4 is an operation explanatory diagram for explaining the operation of the circuit shown in FIG.

FIG. 5 is a schematic configuration diagram of a magnetic recording / reproducing apparatus according to a third embodiment of the present invention.

FIG. 6 is a schematic configuration diagram of a magnetic recording / reproducing apparatus according to a fourth embodiment of the present invention.

FIG. 7 is a schematic configuration diagram of a magnetic recording / reproducing apparatus according to a fifth embodiment of the present invention.

FIG. 8 is an auxiliary diagram for explaining a fifth embodiment of the present invention.

FIG. 9 is a schematic configuration diagram of a portion related to continuous shooting of a conventional portable VTR.

FIG. 10 is an operation explanatory view for explaining the operation of the circuit shown in FIG.

[Explanation of symbols]

101 recording key 102 Stop key 103 key input circuit 104 mode setting circuit 105 Motor control circuit 106 video signal processing circuit 107 TC recording circuit 108 TC regeneration circuit 109 memory circuit 110 comparison circuit 201 magnetic tape 301 Standby off timer circuit 401 magnetic tape 501 S reel 502 T reel 503 rotating head drum 504 pinch roller 505 post 506 magnetic tape 507 capstan shaft 508 S reel motor 509 drum motor 510 capstan motor 511 T reel motor 512 drive 513 drive 514 drive 515 drive 516 Motor control circuit 517 S reel motor control circuit 518 Drum motor control circuit 519 Rotation speed setting circuit 520 Capstan motor control circuit 521 T reel motor control circuit 522 mode setting circuit 523 Standby off timer circuit 601 loading motor 602 Loading motor control circuit 603 loading mechanism 604 post 605 cassette 606 Mode setting circuit 607 Standby off timer 701 Standby off timer 702 Mode setting circuit 703 Reel motor control circuit 704 Capstan motor control circuit 705 rotation speed setting circuit 706 Drum motor control circuit 707 S reel motor 708 T reel motor 709 Capstan motor 710 drum motor 901 Record key 902 Stop key 903 key input circuit 904 Mode setting circuit 905 Motor control circuit 906 Video signal processing circuit 1001 magnetic tape

Claims (6)

[Claims] 1. A time code recording means, a time code reproducing means, and a time code storing means for storing a value of the time code recorded on the magnetic tape by the time code recording means in a recording mode at a predetermined timing.
Time code comparison means for comparing the value of the reproduction time code output from the time code reproduction means with the value of the time code stored in the time code storage means in the reproduction mode, and outputting a detection signal when they match, A switch input means for detecting ON / OFF of a recording switch and a stop switch, and an operation mode of the magnetic recording / reproducing apparatus are set based on output information of the switch input means and a detection signal output from the time code comparing means. Mode setting means and motor control means for controlling the motor based on the mode command signal output from the mode setting means, the mode setting means, in the recording mode, the stop switch ON signal from the switch input means. When input, instead of the recording mode, the magnetic tape is rewound by a specified amount and then stopped. The mode setting means, and when the recording switch-on signal is input from the switch input means in the rewinding mode, the mode setting means shifts to the continuous shooting reproduction mode instead of the rewinding mode, and the mode setting is performed. The magnetic recording / reproducing apparatus is characterized in that, when the detection signal is inputted from the time code comparing means in the continuous shooting reproduction mode, the means shifts to the recording mode instead of the continuous shooting reproduction mode. 2. A time code recording means, a time code reproducing means, and a time code storing means for storing the value of the time code recorded on the magnetic tape by the time code recording means in a recording mode at a predetermined timing.
Time code comparison means for comparing the value of the reproduction time code output from the time code reproduction means with the value of the time code stored in the time code storage means in the reproduction mode, and outputting a detection signal when they match, Switch input means for detecting ON / OFF of the recording switch and the stop switch, tape running stop detecting means for outputting a stop detection signal when detecting that the magnetic tape is stopped for a predetermined time or more, and the switch input means. Mode setting means for setting the operation mode of the magnetic recording / reproducing apparatus based on the output information of the above, the detection signal output from the time code comparing means and the stop detection signal output from the tape running stop detecting means, and the mode setting means. Having a motor control means for controlling the motor based on the mode command signal output from the setting means, When the stop switch ON signal is input from the switch input means in the recording mode, the mode setting means shifts to the rewinding mode in which the magnetic tape is rewound by a predetermined amount and then stopped, instead of the recording mode, and the mode is changed. When the stop detection signal is input from the tape running stop detection means in the rewind mode, the setting means shifts to the standby off mode instead of the rewind mode, and the mode setting means switches the switch in the standby off mode. When the recording switch on signal is input from the input means, the standby off mode is switched to the continuous shooting reproduction mode, and the mode setting means receives the detection signal from the time code comparing means in the continuous shooting reproduction mode. Then, switch to the recording mode instead of the continuous shooting playback mode. Magnetic recording and reproducing apparatus characterized. 3. A drum motor for driving a rotary head drum equipped with a rotary magnetic head, and tape running stop detection means for outputting a stop detection signal when it is detected that the magnetic tape is stopped for a predetermined time or more. A mode setting means for setting an operation mode based on a stop detection signal output from the tape running stop detection means, and a rotation number of the drum motor are set in accordance with a mode command signal output from the mode setting means. A drum motor control means for controlling rotation is provided, and the drum motor control means receives a standby off mode command signal from the mode setting means based on a stop detection signal output from the tape running stop detection means. When output to the motor control means, the drum motor control circuit sets the number of rotations of the drum motor in the recording or reproduction mode. Magnetic recording and reproducing apparatus characterized by setting the rotational speed lower than the rotation speed that. 4. A rotary head drum having a rotary magnetic head mounted thereon, a drum motor for driving the rotary drum, tape loading means for bringing a magnetic tape into contact with the rotary head drum, and conversely the magnetic tape for rotating the magnetic tape. Tape unloading means for separating from the head drum, tape running stop detecting means for outputting a stop detection signal when it is detected that the magnetic tape has stopped for a predetermined time or more, and a stop output from the tape running stop detecting means Mode setting means for setting an operation mode based on a detection signal, loading control means for operating the tape loading means and the tape unloading means in response to a mode command signal output from the mode setting means, and the same as above. In response to the mode command signal output from the mode setting means, the drum motor The tape loading means has a drum motor control means for setting the number of revolutions and controlling the rotation, and the tape loading means receives a standby off mode command from the mode setting means based on a stop detection signal output from the tape running stop detection means. Activating the tape unloading means when a signal is output to the loading means,
On the contrary, when the standby off mode command signal is not output from the mode setting means to the tape loading means, the tape loading means is operated, and the drum motor control means is stopped by the tape running stop detection means. When a standby off mode command signal is output from the mode setting means to the drum motor control means based on the detection signal, the drum motor control means determines the rotation speed of the drum motor in the recording or reproduction mode. A magnetic recording / reproducing apparatus characterized in that the rotation speed is set to be lower than that. 5. A drum motor for driving a rotary head drum having a rotary magnetic head, a time code recording means, a time code reproducing means, and a time recorded on a magnetic tape by the time code recording means in a recording mode. A time code storage means for storing a code value at a predetermined timing, and a reproduction time code value output from the time code reproduction means in a reproduction mode and a time code value stored in the time code storage means. Then, a time code comparing means for outputting a detection signal when they match, a switch input means for detecting ON / OFF of the recording switch and the stop switch, and a stop when the magnetic tape is stopped for a predetermined time or more A tape running stop detecting means for outputting a detection signal and output information of the switch input means. And mode setting means for setting the operation mode of the magnetic recording / reproducing apparatus based on the detection signal output from the time code comparison means and the stop detection signal output from the tape running stop detection means, and the mode setting means Drum motor control means for controlling the rotation by setting the rotation speed of the drum motor in response to the output mode command signal, and the rotation direction of the capstan motor in response to the mode command signal output from the mode setting means. And a capstan motor control means for controlling the rotation speed, and the mode setting means, when a stop switch-on signal is output from the switch input means in the recording mode, replaces the recording mode with a predetermined amount of magnetic tape. Tape length L1) A rewinding mode is performed in which the tape is rewound and then stopped, and the mode setting means When a stop detection signal is output from the tape running stop detecting means in the reverse mode, the rewind mode is switched to the standby off mode, and the mode setting means is switched from the switch input means to the recording switch in the standby off mode. When the ON signal is output, the standby mode is switched to the continuous shooting reproduction mode (tape speed V1), and the mode setting means outputs the detection signal from the time code comparing means in the continuous shooting reproduction mode. Then, the recording mode is changed to the continuous shooting reproduction mode, and when the standby off mode command signal is output from the mode setting means to the drum motor control means, the drum motor control circuit rotates the drum motor. Number of revolutions lower than the number of revolutions in record or playback mode A magnetic recording / reproducing apparatus characterized by being set to a number. 6. The rewinding amount L1 (mm) of the magnetic tape in the rewinding mode is the time required for the drum motor to rise from the low speed rotation set in the standby off mode to the normal rotation speed in the recording mode T1 (. se
c), tape running speed V1 in continuous shooting reproduction mode
The magnetic recording / reproducing apparatus according to claim 5, wherein L1> T1 × V1 is set when (mm / sec).