JPS60231902A - recording device - Google Patents

Abstract

PURPOSE:To prevent a screen from noises due to the influence on a recording circuit or the like or from a synchronization even if the recording circuit or the like is influenced in accordance with the variation of power supply voltage by selecting the ON/OFF control of a plunger for driving a pinch roller or a brake for the idling period of a head. CONSTITUTION:Even if the rotational phase of a rotary drum 1 is disturbed, the delay time (t) of a delay circuit 17 is properly fixed so that a vertically synchronizing signal Pv inserted into an image pickup signal is not lacked. In this example, the vertically synchronizing signal Pv is controlled so as to be obtained after the passage of a prescribed period from a reference signal at the synchronization of the rotational phase with the reference signal, so that the delay time (t) of the delay circuit 17 is fixed such that the vertically synchronizing signal Pv is obtained after the passage of the prescribed period from a pulse 1/2PGD even if the rotational phase is disturbed. Even if the phase of the rotary drum 1 is delayed at the starting of rerecording, the vertically synchronizing signal Pv inserted into the image pickup signal is not lacked and the screen can be prevented from disturbance at the time of continuous photographing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording device suitable for application to an ultra-compact camera-integrated video device designed to be highly mobile.

BACKGROUND TECHNOLOGY AND PROBLEMS In the ultra-compact camera-integrated video, which has recently been commercially available and is attracting attention, as shown in Figure 1, a tape (2) is connected to a rotating drum (1) over an angular range of approximately 300°. At the same time, the tape (2
), one field worth of video signal is recorded. The rotating magnetic head is a double azimuth head Ha.
, 'Hb is used.

FIG. 2 shows an example of a trunk pattern recorded in this manner, in which the tracks marked with broken lines are the idle running periods in each field, and the tracks of each head Ha.

This is the section where Hb is barely in contact with the tape (2).

Camera control and phase servo of the rotating drum +11 are performed based on a signal 4 obtained from the same synchronizing signal generator provided within the main body of the apparatus.

For example, as shown in FIG.
) is driven and controlled by the output of Signal recording section (
5) has a function of recording at least the image signal output from the video camera (7); this may be a recording-only device or a device capable of recording and reproducing. For this reason, the signal recording unit (5) receives a reference signal R[! A control pulse CTL to be recorded on F-5 or tape (2) is supplied. Phase servo is performed so that the output pulse of a pulse generator (PG) provided on the rotating drum matches the reference signal REF-3.

Now, such a camera-integrated video system can also be applied to a recording system in which the tape speed is faster than the current one. An example of a method for recording ``ζ imaging signals at a tape speed higher than that currently available is a recording method in which a luminance signal and a color signal are recorded on separate tracks, respectively.

This recording method converts the image signal output from the television camera (7) into a luminance signal and a color signal, such as a pair of color difference signals R-Y.
The pair of color difference signals R-Y and f3-Y are separated into red color difference signals R-Y and f3-Y in the first half of one horizontal period, with their time axes compressed to 1/2. The signals are arranged on the time axis so that the blue color difference signal B-Y comes in the latter half, and the compressed color difference signal (time division multiplexed signal) and the luminance signal are transmitted using separate heads (Ha and Hb on the upper side). This is a method in which tracks are recorded on adjacent tracks. This recording method was devised as a means to obtain high meat quality.

In such Y/C separated recording, the frequency handled becomes higher, so when applying it to the above-mentioned camera-integrated video, the tape speed is lower than the current speed (for example, 20 m /
sec), for example, about 6 times (11B+u/s
ec), it has to be faster.

Now, whether the tape speed is slow or fast,
When shooting scenes together, if you set the recording timing or stop timing of the video signal arbitrarily, the scene seam may end up within the screen, which may cause
This situation must be avoided at all costs, as the quality of the meat will deteriorate significantly. For this purpose, the timing of recording or stopping should be selected during the idle running period of the head.

Here, the relationship between the pulse generator (PG) provided in connection with the rotating drum tll and the rotating heads Ha, Hb is as follows:
The mechanical attachment is uniquely determined by the position, and in a steady running state, the relative phase between the rotational pulse PG detected by the pulse generator (PC) and the vertical drive signal VD is constant. Therefore, by setting the ζ recording or stopping timing based on the rotation pulse PG, it is possible to match the recording or stopping timing with the idle running period of the head.

FIG. 4 is a diagram showing the relationship between the rotating heads Ha, Hb and the pulse generator. In this example, due to design constraints, magnets for the pulse generator are placed at the same rotational positions as the rotating heads Ha, Hb. M is not installed. In this way, when the magnet M is installed at a position that is rotationally ahead of the rotary head Hb by α, the fifth
As shown in FIGS. A and B, at the timing when the rotation pulse PG is obtained, the rotary head Hb has not yet entered the idle running period A of the head.

Therefore, in this case, it is sufficient to control a control device composed of a microcomputer, etc., which determines the recording, stop timing, etc. using the delayed rotation pulse PGD (Fig. 5C), which is obtained by delaying the rotation pulse PC by a predetermined time t. . The fifth diagram shows an example of the timing pulse formed by this delayed rotation pulse PGD.

By the way, regardless of whether the tape speed is slow or fast, when performing scene splicing operations, in order to eliminate video blank periods at the seams and prevent internal disturbances, it is necessary to return the tape a specified amount and overwrite some parts. However, in order to return the tape by a predetermined amount in this way, it is necessary to change the on/off timing of the pinch roller and the reel brake as desired, as will be described later.

However, if this on/off timing is not correct, the pinch roller or brake may be turned on or off while the head is in contact with the tape. The pinch roller is turned on and off, that is, brought into contact with and separated from the capstan, by controlling the plunger. The same applies to turning the brake on and off.

The energization and deenergization of the plunger is controlled by current control, but at this time, the power supply voltage fluctuates, which affects the recording circuit, etc., and as described above, the head is in contact with the tape. At times, this effect appears as noise on the screen and may cause synchronization to be lost.

OBJECTS OF THE INVENTION Therefore, the present invention proposes a recording apparatus that has a simple structure and eliminates the deterioration of image quality and disturbance of synchronization caused by plunge control for driving pinch rollers and brakes.

SUMMARY OF THE INVENTION Therefore, in the present invention, the on/off timing of the pinch roller and the plunger for driving the brake is made to coincide with the idle running period of the head. Follow ζ,
The on and off timings of the pinch roller and brake are all related to the delayed rotation pulse.

Embodiment Next, an example of the present invention will be described in detail with reference to FIG. 6, with reference to FIG.

In FIG. 6, Qol indicates a recording device according to the present invention, which includes an imaging device (imaging system of a video camera) (1
1), and the ζ imaging signal, that is, the luminance signal and the time-division multiplexed signal are supplied to the corresponding heads Ha and Hb (simultaneously recorded) via the recording circuit (12). Horizontal and vertical drive signals HD, 'VD, etc. are supplied to the imaging device (11), and the recording circuit (
12) is supplied with a composite synchronization signal 5YNC, etc. Further, the control pulse CTL generated by the synchronization signal generator (6) is supplied to the control head Hc via the amplifier (13) and recorded on the tape (2) once every C31 frame.

A pulse generator (15) is associated with the rotating drum (1), and a detection head HP that constitutes this pulse generator (15)
The rotation pulse (P) associated with the rotation of the rotating drum (1) from
C pulse) PG is detected and counted down to 1/2 by a counter (I6) to form a rotation pulse 1/2 PC having a frame period.

This rotational pulse 1/2PG is delayed by a predetermined time t in a delay circuit (17). As mentioned above, this delay time t is a time that has the same timing as the vertical drive signal VD, and by doing so, the vertical drive signal VD can be
The timing relationship between the frame signal 1/2VD whose frequency has been stepped down to /2 and the delayed rotation pulse 1/2PGD is shown in Figure 7B.
, becomes like C. The delayed rotation pulse 1/2 PGD is supplied to a control bag ff (20) composed of a microcomputer.

The control device (20) is used to obtain various timing pulses for the signal processing system and tape drive system (30) in the signal recording section (5), and is used to obtain command pulses REC-T (recording start and recording end command pulses). 7A) etc. are generated.

The load pulse LD and the AND load pulse υNLD (H, I in FIG. 5) generated by the control device (20) are supplied to the loading motor (32) via the driver (31). This motor (32) is for driving a loading ring provided with a tape guide. In addition, the plunger (33) for driving the pinch roller is provided with a pinch-on pulse P/ON and a pinch-off pulse P/O.
FF (FIG. 7G, J) is supplied. Further, a plunger (35) for driving the brake for the supply reel S and the take-up reel T (see FIG. 6) is supplied with a brake-on pulse BRK which is delayed for a predetermined time by a brake-on pulse BR to OFF and a delay circuit (36).・0NDL (Figure 7F,
K) is supplied.

The command pulse REC-T, the pinch roller, and the on and off pulses supplied to the plunger for driving the brake are all generated in synchronization with the delayed rotation pulse 1/2 PGD.

Note that the plungers for driving the pinch roller P and the brake B (see FIG. 8) are both self-holding types.

The above-mentioned delayed rotation pulse 1/2 PGD is further supplied as a reset pulse to the synchronization signal generator (6) via the switching means (40).
40) is controlled by a switching pulse V-RH3ET (711D) generated by the control device (2o).

Now, FIG. 8 shows the relationship between the on/off of the brake and the on/off of the pinch roller in the continuous shooting mode using a tape pass.

A in the figure shows the recording state. Therefore, the brake is off (
The brake shoe is separated from the supply and take-up reels)
, the pinch roller is off (separated from the capstan C).

In this state, when the pause button etc. is operated at an arbitrary time ts (71yJ), the control device (20) generates a recording end command pulse REC-T (to Fig. 7), and this generation timing Since the brake-on pulse BRK ON is generated by the delayed rotation pulse 1/2 PGD that arrives next (time t2), the brake-on delay pulse BRK -0N is generated at time t3 after the predetermined delay time τ has elapsed.
DL occurs and reel rotation is stopped.

On the other hand, the pinch-off pulse P for the pinch roller
・OFF occurs at least at time t4, which is more than IcTL after time t3, and this timing difference (t4 t3)
This causes the tape to slacken (Figure 8B). The slack of the tape is caused by the action of the tension regulator TA. The pinch-off pulse P.OFF is obtained in synchronization with the delayed rotation pulse 1/2PGD, and at this time point t4, the recording control signal RFC is obtained and recording ends Y.

As mentioned above, the timing at which the delayed rotation pulse 1/2 PGD is obtained is during the idle running period of the head, so even if the plungers (33) and (35) are turned on and off during this idle running period, There is no impact at all. Therefore, poor image quality due to noise contamination, synchronization disturbance, etc. do not occur.

At time t4, the pinch roller is turned off, and the tape is rewound toward the supply reel by the amount of slack due to the action of the tension regulator (FIG. 8C). Since this tape return amount differs depending on the brake-on timing, the delay time τ
By adjusting the ζ return amount, the secondary cylinder can be adjusted. for example,
When the tape speed is 118.58n+/s, the tape return amount is approximately 1. ? Since it is C'Ir L, this return amount is not an integral multiple of CTL.

Therefore, at this time, the delay time τ is controlled so that the return amount is returned by an integral multiple of 'J degrees CTL, which is ICTL in this example. Further, the amount of return varies depending on the force of the pinch roller, so there is some variation. This variation can be absorbed by adjusting the delay time. If the returned amount becomes ICTL, only one trunk will be overwritten at the time of re-recording, as will be described later.

The period of brake on pareless BR to ON is almost 20 seconds.
ec, the brake-on state is released at time t6, and the pinch-off state is released at time t7,
An unloading pulse UNLD is obtained at time t8. This allows the loading river ring to
The ring is slightly loosened by being rotated in the opposite direction by ll T a.
The tape guide G returns a little, and the tape returns a predetermined amount, 1. The OCT is completely returned by L (Fig. 8D)
).

Next, when the recording start button is operated at an arbitrary time point t3, a command pulse REC-T to start recording is generated, and a load pulse LD is output at this timing to return the ring to the state at the time of recording. , the tape (2) is now wound around the rotating drum (1) with a predetermined tension (Fig. 8E).

The reason why the tape (2) was loosened in the pause state was to protect the tape (2) and prevent the occurrence of clogs, since the drum (1) rotates during the pause. This is to protect the head.

A switching pulse V-RESET is generated at the arrival of the first delayed rotation pulse l/2PGD after the input of the command pulse REC-T (time t+o), which causes the switching means (
40) is turned on, and the synchronization signal generator (6) is reset. As a result, the timings of the delayed rotation pulse 1/2 PGD and the vertical drive borrow VD, and hence the frame signal 1/2 VD, are correlated as expected. Also, time ti1
Then, in synchronization with 1Iiu rotation pulse l/2PGD, CC Vincion pulse ON and brake off pulse Bl? K.
OFF and the recording control signal REC are obtained, so re-recording starts from this time t1'1 (8th
Figure F).

Delay rotation pulse 1/2 PG even when starting re-recording
Since the pinch roller and brake are turned on and off based on D, there is no influence due to the electric wire fluctuation caused by the plunger at this time as well.

The recording control signals RF, C may be obtained at time t12.

Here, when the rotational state of the rotating drum (1) is sufficiently stable, the delayed rotational pulse 1/2PGD obtained in synchronization with the rotation of the rotating drum (1) is the synchronization signal generator (6).
The imaging signal has a certain phase relationship with a reference signal (VD, etc.) obtained from the reference signal, and an imaging signal with a certain relationship with this reference signal is obtained. As mentioned above, C is also a rotating drum (1
) is delayed from the reference signal, but the oscillator provided in the synchronizing signal generator (6) is reset by the delayed rotation pulse 1/2 PGD. Therefore, the phase of reference signals such as horizontal and vertical drive signals formed based on this oscillation output is associated with the phase of pulse 1/2PGD.

Therefore, the imaging signal associated with the pulse I/2PGD is also output.

Therefore, the delay time t of the delay circuit (17) is appropriately determined so that the vertical synchronization signal pv inserted into the imaging signal will not be lost even if the rotational phase of the rotary drum (1) is disturbed. In this example, when the rotational phase is synchronized with the reference signal, the vertical synchronization signal pv is obtained after a predetermined period has elapsed from the reference signal, so even if the rotational phase is disturbed, the pulse I/2PGD The delay time of the delay circuit (17) is determined so that the vertical synchronization signal PV is obtained after the predetermined period has elapsed.

As a result, the phase of the rotating drum fil at the start of re-recording is delayed, and vertical synchronization
There is no lack of issue PV. Therefore, it is possible to prevent screen disturbances during continuous shooting.

Note that the reset period for the synchronization signal generator (6) is approximately 300 msec, and the pinch-on pulse P・ON
and brake off pulse BR to F is approximately 200m se
It is c.

Also, as is the case with the 7th meas IB and C, in this example, the relationship is such that a delayed rotation pulse 1/2 PGD is obtained corresponding to the even field E, so this delayed rotation pulse 1/2 PGD is Based on this, the recording control signal REC is issued/4
Niji, the field at the end of recording is always an odd field.
It becomes O. And recording starts with delayed rotation pulse 1/2PG
Since this is performed in synchronization with D, the starting soil angle at the start of recording starts from the even field "E."Therefore, the continuity of the framing before and after the continuous shooting is maintained at "1".

Application Example FIG. 6 shows that the present invention is applied to a recording system in which the tape speed is selected to be faster than the current one, or it can also be applied to a well-known recording device that records video signals at the current tape speed. .

Even in this well-known recording device, the tape amount is returned by a predetermined amount during continuous shooting. However, in this case, the operation is slightly different. When stopping recording or starting a pose, Zunawaji uses the force of the tension arm to hold the tape (
After rewinding 2) by, for example, 101-rank, it automatically enters the playback mode and counts the control pulses CTL recorded on the tape (2), and the heads Ha and nb start from the end of the already recorded trunk, for example. The stop mode is set before three tracks (and the head is always positioned above the already recorded trunk when recording starts).

Even in such a case, if the pinch roller and the plunger for driving the brake are controlled based on the delayed rotation pulse 1/2 PGD as shown in FIG. 7, the influence of the plunger can be avoided.

As described in detail, in this invention, since the on/off control of the plunger for driving the pinch roller and brake is selected during the idle running period of the head, the recording circuit etc. Even if it is affected, the effect will not appear as noise on the screen, nor will the screen synchronization be disrupted.

Further, in the present invention, since the recording timing and stop timing for the video signal are also related to the delayed rotation pulse 1/2 PGD, there is no possibility of continuous shooting of scenes during signal recording.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between a tape and a rotating drum used to explain the present invention, FIG. 2 is a diagram showing an example of the recording device, FIG. 3 is a block diagram showing an example of the recording device, and FIG. Figure 5 shows the relationship between the rotating head and the pulse generator.
6 is a block diagram of an example of the recording device according to the present invention, FIG. 7 is a waveform diagram 1 to explain the operation, and FIG. 8 is a waveform diagram for explaining the operation. This is a neo-diagram showing the on/off relationship of rollers and brakes. (5) is the signal recording section, (6) is the synchronization signal generator, α0)
is the recording device, Ha+Hb is the head, (17), (3
6) is a delay circuit, (20) is a control device, (33) is a plunger for driving the pinch roller, and (35) is a plunger for driving the brake.

Claims (1)

[Claims] (2) A recording device in which a video signal is recorded by a head, in which the on/off timing of a driving plunger such as a pinch roller is selected during the idle running period of the head.