JPS6272283A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain simply the pickup at the slow speed shot mode by completing video recording after a pickup time corresponding to one frame elapses from the next video recording point of time and then rewinding a type and making the titled device standby for the next pickup. CONSTITUTION:A low speed shot switch 54 is closed at the low speed shot mode. A control section 20 outputs a recording signal (REC) leading at a time t3 after a prescribed time elapses from the point of time receiving a start signal to a terminal 100 of a slow speed shot control circuit 60. A time t1 setting circuit and a time T2 setting circuit of the circuit 60 generates a stop signal having a pulse width T2 at a time t4 after a time T1 elapses from the time t3 and outputs the signal to the control section 20. The control section 20 makes a recording signal fall down at a time t5 after a prescribed from the reception of the stop signal to stop the video recording. Then, a pause signal (PAUSE) representing the state that the pickup preparation is finished at a time T6 is outputted to a terminal 102.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic recording and reproducing device for a video system including a video camera, a video tape recorder, etc., and particularly to a magnetic recording device that enables frame-by-frame shooting (shooting in animation mode). Regarding photography equipment.

[Background of the invention]

One type of shooting using a video camera is called "frame shot" or "animation." In this shooting, for example, video signals are shot in units of several fields so that images can be played back several frames per second, and by playing back these continuously, it is played back as if a stationary object is being driven. It is a method.

As a video camera used for this "frame-by-frame shooting" or "animation" shooting, a camera capable of so-called "splicing shots" is used. This "continuation shooting" is when the operation of one shooting - shooting completion and the first shooting is repeated.
The servo system can be driven and controlled so that recorded portions are continuous on the magnetic tape.

However, in conventional video systems, the above-mentioned "frame-by-frame" or "animation" shooting requires complicated operation of the shooting release, so in reality, only some enthusiasts do this. There was a desire to create a system that could be easily implemented.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a magnetic recording and reproducing device that can easily take pictures in frame-by-frame mode. In order to achieve this, at the end of recording, part of the tape is rewound to wait for the next recording, and at the time of the next recording, the speed and phase of the playback servo are fixed, and the speed and phase of the playback servo are fixed. In a magnetic recording/playback device capable of continuous shooting, which switches from the playback system to the recording system and starts recording in the vicinity of the recording system, the recording is ended after a partial shooting time has elapsed from the above-mentioned next recording time, and then the above-mentioned The present invention is characterized by having a mechanism for rewinding the tape for splicing and waiting for the next photographing.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the magnetic recording and reproducing apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. Prior to explaining the examples,
The control sequence in the "continuous shooting" mode will be explained based on FIG. 4. In the figure, in a magnetic recording and reproducing device with a continuous shooting function, when one shooting is completed, the running of the magnetic tape is stopped by a capsun reversing brake, and the recording processing circuit is automatically set to a recording pause state. . At this time, the magnetic tape normally overruns the desired stop position, that is, the recording end position f1 (overrun amount α). Next, the magnetic recording and reproducing apparatus is automatically set to record-pause reverse (RPR), and the magnetic tape is fed backwards and stopped near the stop position r2, which is sufficiently before the stop position f. The amount of overrun at this time is assumed to be β1 (1-A, 2-A).

Next, the magnetic recording/reproducing device is automatically set to Rec Pause Forward (RPF), runs the magnetic tape in the forward direction, stops at f3 near the stop position arz, and then the Rec Pause state is released and the next Preparations for filming are complete. The overrun amount at this time is β2 (2-B)
. The purpose of performing this RPF is to avoid slack in the magnetic tape due to its mechanism.

Now, in such a state, when the next photographing operation is started, the magnetic recording and reproducing device starts the RPF operation again, reproduces the track recorded in the previous photographing, and adjusts the speed and phase of the reproduction servo system to the tape. to enable recording with the same speed and phase as the previous recording (3-
A). From here, the servo system is switched from the reproduction system to the recording system two fields before the stop position f1 at 1-A (3-B). Next, stop position W[ at 1-A.

Recording of the next photograph starts from the point (3-C). Here, the start of recording for the next shooting does not necessarily have to coincide with the stop position Wrl, and for example, the last two fields of the previous recording can be overwritten on the magnetic tape by the above control sequence. This makes it possible to connect the recorded part of the previous ↑most submergence and the recorded part of the next photograph.

Next, FIG. 1 shows the configuration of a magnetic recording and reproducing apparatus according to the present invention. In the figure, 10 is a video camera head;
This video camera head 10 is controlled by a control section 20 such as imaging. The control unit 20 further controls ATF (Aut
o Tracking Follow) Servo 30,
It controls the drive of each servo system such as the drum servo 40 and the capstan servo 50, controls the frame capture control circuit 60, and controls the mode control motor 22 that drives the tape reel 12.

Regulation? The first part 2o further receives output signals indicating various states of the video camera system, input signals from various sensors 34, input signals from the video function button 36, etc., and correspondingly controls various mechanisms of the video camera system. Control.

The A'TF servo 30 is a tracking control mechanism when reproducing video signal tracks recorded on a magnetic tape.
For example, the tram servo 40 and capstan servo 50 are operated by detecting a pilot signal superimposed and recorded on each video trunk from the video/audio circuit 28 so that the magnetic head accurately follows the track. The drum servo 40 has a head 16 and a head 18 on the outer circumferential surface.
It is a mechanism that servo-controls a drum motor 24 that rotationally drives a drum on which an erasing head 19 is disposed.For example, in recording, it controls the speed and phase of an input video signal, and in playback, it controls the Speed and phase control is performed on the output of the ATF servo system.

Here, the erase head 19 is a flying erase head, and if a fixed erase head is used, so-called rainbow noise will occur due to interference between the recorded signal before erasing and the recorded signal after erasing.・This rainbow noise can be removed by using a head.

In addition, the capstan servo 50 controls the capstan servo 14 that drives the capstan shaft in the same manner as above.
I do it.

In such a video camera system, in order to perform the above-described "spread shooting", for example, one of the video function buttons 36 must be operated to press the first release button.
When the shooting of the scene is completed, the control port unit 20 sets the video camera system to the recording pause state, operates the tram servo 40, capstan servo 50, and motor control motor 12, and starts the RP of the fourth leap.
After performing the operations R(1-A) and RPF(2-B), the first recording is completed. After that, when the second shooting took place, the system was closed. The 311 section operates the ATF servo 3.degree., the drum servo 40, the capstan servo 50, etc. to perform the operation of RPF (3-B) in FIG. 4, thereby enabling continuous shooting.

Reference numeral 42 denotes a connector, which is configured to be connectable to an external mechanism such as a television.

As shown in FIG. 2, the frame shooting control circuit 60 includes time setting circuits 7o and 72 for controlling the filtering time when shooting with frame ti remote, and a time setting circuit 72 for controlling the filtering time when shooting with frame ti remote, and a time setting circuit 72 for starting partial shooting according to a shooting command. A time setting circuit 76 for controlling the frame-by-frame shooting interval time in the automatic frame-by-frame shooting mode, a time setting circuit 78 for controlling the frame-by-frame shooting interval time in the automatic frame-by-frame shooting mode, and a time setting circuit 78 for controlling the frame-by-frame shooting interval time in the automatic frame-by-frame shooting mode. ! (Various timers such as a time setting circuit 82 are built in to drive the buzzer 52 that notifies the IW completion state. Here, the "-frame" in the "-frame photography" means, for example, a stationary frame. This refers to a unit in which the subject is recorded in 4 fields, 8 fields, or 12 fields as the closest shadow, and in this example, it is possible to reproduce 15 frames, 7.5 frames, and 5 frames per second.Control circuit 60 is the control of the video camera system: rl
It is connected to the J part 20 by tangent M wires 200, 202 and 204, and is also a main switch for performing frame-by-frame shooting, and a frame-taking switch 54, which is used to manually start the actual shooting after completion of frame-by-frame shooting preparations. Partial shooting Swissochi 58 to make it happen
, and a main switch 56 for operating a timer 76 to perform automatic frame photography mode.

In the magnetic recording and reproducing apparatus having the above configuration, there is no difference in configuration from the conventional example with respect to the parts other than the frame control circuit 60. In the frame photography mode, the frame photography switch 54 is closed.Time tIT: The power is turned on, and then when the manual frame I is at its lowest point, the partial photography switch 58 is closed. In addition, when the main switch 56 is closed in automatic frame photography, immediately in manual frame photography, and every time T3 set by the T3 time setting circuit 76 in automatic frame photography,
A recording start signal of the pulse intensity T set by the T4 time setting circuit 78 is output from the T4 time setting circuit 78 to the control unit 20 from the terminal 104 via the diode 80, resistor b'C86, and transistor 88 at time t2. .

The control unit 20 outputs a recording signal (REC) that rises at time t3, which is a certain period of time after receiving the start signal, to terminal 1 (10) of the frame photography control circuit 60. In the frame photography control circuit 60, the T3 time setting circuit 70 ., the T2 time setting circuit 72 creates a stop signal with a pulse width T2 at time L4, which is a time T1 elapsed from time L3, and the stop signal is sent from the terminal 104 to the control unit 20 via the diode 74, resistor 86, and transistor 88. The control unit 20 outputs a time t when a certain period of time has elapsed since receiving the stop signal.

The recording signal is caused to fall, and the recording operation is stopped.

After that, the time was also taken at Yj1. A pause signal (PAUSE) indicating the completion of preparation is output from the control unit 20 to the terminal 102 of the frame photography control circuit 60, and the time setting circuit 82 turns on the buzzer 84 for a period of time T5 from the rise of the pause signal. Buzzer 84 sends a drive signal for operation.
Output to. As a result, the photographer who is shooting in frame mode will be alerted by the buzzer 84 when the next frame is ready.
You can know that the most shadow preparation has been completed.

It should be noted that the camera may be configured to emit an alarm sound different from the alarm sound emitted at the end of preparation for photographing during recording. With this configuration, it is possible to reliably grasp the time interval from the end of the recording operation to the end of preparation for photographing.

As described above, according to this embodiment, when shooting in the frame-by-frame mode, the photographer does not accidentally put his hand or the like in order to move the subject in front of the video camera's shooting lens during recording. do not have.

〔Effect of the invention〕

As explained above, according to the magnetic recording and reproducing apparatus according to the present invention, it is possible to take pictures in frame-by-frame mode.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the magnetic recording/reproducing apparatus according to the present invention, FIG. 2 is a block diagram showing the configuration of the frame 1 control circuit in FIG. 1, and FIG. 3 is a block diagram showing the configuration of the frame 1 control circuit in FIG. 1. ! FIG. 4 is a timing chart showing the operation of one circuit, and FIG. 4 is a sequence diagram showing the control sequence in continuous shooting mode. DESCRIPTION OF SYMBOLS 10... Video camera head, 20... Control part, 52... Buzzer, 60... Fractional shooting control circuit,
70.72.76.78.82...Time setting circuit.

Claims (1)

[Claims] At the end of recording, the tape is rewound once to wait for the next recording, and at the time of the next recording, the speed and phase of the playback servo are fixed, and the speed and phase of the playback servo are fixed. In a magnetic recording/playback device capable of continuous shooting that switches from the playback system to the recording system nearby and starts recording, after the shooting time corresponding to one frame has elapsed from the above-mentioned next recording point,
1. A magnetic recording and reproducing apparatus characterized by having a mechanism for finishing recording and then rewinding the tape for the continuous shooting and waiting for the next shooting.