JPS60160078A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To shift quickly and assuredly a magnetic head to a track which is not recorded yet in case a recording medium which is under a recording process is recorded again, by adding a means for detecting a recorded area and a means for delivering an automatic track shift instruction signal in response to the output signal of said detecting means. CONSTITUTION:The video signals are recorded to the 1st-n-th tracks of a recording medium 1. The signal recorded on the 1st track is applied to a reproduction circuit 9 and a threshold circuit 10 by a magnetic head 3. The circuit 10 checks by the level of the output signal of the circuit 9 whether the corresponding track is already recorded or not. When the level of the output signal of the circuit 9 is higher than the prescribed velue, a recorded area detecting signal is applied to an automatic shift switch 11. Then the switch 11 delivers an automatic track shift signal, and a drive circuit 5 moves the head 3 to the next track via a shift mechanism 4. This action is repeated up to the (n+1)th track. Then the shift of the head 3 is stopped to set a recordable state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic recording and reproducing device, and more particularly to a magnetic recording and reproducing device for still image video signals.

[Prior Art] Conventionally, there has been a device of this type applied to a so-called electronic camera, as shown in FIG. FIG. 1 is a block diagram of a conventional magnetic recording and reproducing apparatus for video signals. In the figure, a recording medium 1 such as a magnetic disk is attached to the shaft of a motor 2.
is installed, and recording medium 1 is Recording Video II! It has concentric tracks that record signals. The motor 2 rotates the recording medium 1 at a predetermined rotational speed. The manual movement switch 6 is connected to the drive circuit 5, and the drive circuit 5 is connected to the motor 43. A rack 41 is provided on the lower surface of the movable body 40, and a pinion 42 is engaged with the rack 41. The motor 43, the moving body 40, the rack 41, and the pinion 42 constitute the moving mechanism 4. Ma IC1 moving body 4
A magnetic head 3 is provided at the bottom end of the magnetic head 0 . The manual movement switch 6 outputs a manual truck movement command signal, and the manual truck movement command signal is given to the drive circuit 5. The drive circuit 5 moves t in response to a manual track movement command signal.
By driving M@4, the moving mechanism 4 moves the magnetic head 3 over the recording medium 1 in a direction intersecting the 1-rack at predetermined track intervals. That is, the drive circuit 5
The motor 43 rotates the pinion 42 to move the movable body 40. The output terminals of the recording circuit 8 and the reproducing circuit 9 are connected to a head signal changeover switch 7, and the head signal changeover switch 7 is connected to the magnetic head 3. The head signal changeover switch 7 switches the connection of the magnetic vibration head 3 to the recording circuit 8 or the reproduction circuit 9 during recording or reproduction. The recording circuit 8 amplifies the input recording video signal and outputs it. The magnetic head 3 is connected to the recording medium 1
A signal is recorded on the recording medium 1 or a signal is reproduced from the recording medium 1.

The reproduction circuit 9 amplifies and outputs the reproduced signal.

Next, the operation of this @ position will be explained. During recording, a recorded video signal is input to the recording circuit 8, and its output signal is given to the head signal changeover switch 7.

Since the head signal changeover switch 7 is connected to the b side, the output signal from the recording circuit 8 is given to the magnetic head 3 and recorded on the recording medium 1. One frame of video is recorded on one track of the recording medium 1, and when the recording of one track is completed, the manual movement switch 6 is pressed to move the magnetic head 3 one track. On the recording medium 1, one frame of video is recorded for each concentric unit track.

During playback, the head (#i8 changeover switch 7 is connected to allG-), so the signal reproduced from the recording medium 1 by the magnetic head 3 is given to the playback circuit 9 via the head signal changeover switch 7, amplifies and outputs this signal.The output signal of the reproduction circuit 9 is sent to various signal processing circuits (
(not shown) is output as a video signal.

Conventional magnetic recording and reproducing devices for video signals are as described above.
Since the recording medium is oval-shaped, if you remove the recording medium from this @ position and try to record on the next track of the recording medium without recording on all the tracks on the recording medium, you will not know how many tracks you have to record to. Since this cannot be determined, the disadvantage is that the device must be placed in the playback mode, and the user must push the manual movement switch while looking at the playback screen to move the magnetic head to the track that can be recorded.

[Invention No. 11 This invention has been made to eliminate the drawbacks of the conventional ones as described above. Therefore, the main purpose of the invention is to record up to an intermediate track and then continue to record on a recording medium again. To provide a signal magnetic recording/reproducing device capable of reliably and quickly moving a magnetic head to an unrecorded track and starting recording when recording.

To summarize the present invention, in addition to the conventional method, a recording area comparison detection means for reproducing a signal recorded on a track on a recording medium where a magnetic head is located and detecting a recording area. The present invention is a signal magnetic recording and reproducing device which includes an automatic movement command signal generating means for outputting an automatic track movement command signal in response to an output signal of the detection means.

The above objects and other objects and features of the invention will become more apparent from the following detailed description with reference to the following.

[Embodiment of the Invention] FIG. 2 is a block diagram of a video signal magnetic recording and reproducing apparatus which is an embodiment of the invention. In addition, in Figure 2,
Components similar to those in FIG. 1 are given the same reference numerals. The difference between the block diagram of this device and the block diagram of the conventional device shown in FIG. 1 is that a threshold circuit 10 and an automatic diameter switch 11 are newly added to the conventional device. The output end of the regeneration circuit 9 is connected to a threshold circuit 10, and the threshold circuit 10 is connected to the automatic movement switch 1.
1 to the drive circuit 5.

The output signal of the reproducing circuit 9 is given to a threshold circuit 10. The threshold circuit 10 outputs a recording area detection signal based on the output signal of the reproduction circuit 9, and the recording area detection signal is applied to the automatic movement switch 11. The automatic movement switch 11 outputs an automatic track movement command signal based on the recording area detection signal, and the automatic track movement command signal is sent to the drive circuit 5.
given to. The drive circuit 5 drives the movement 11#j44 by the automatic 1-rack movement command signal in the same way as when the manual track movement command signal is applied.

In this embodiment, in order to detect the recording area of the track, a conventional device is equipped with means for reproducing the signal recorded on the track where the magnetic head 3 on the recording medium 1 is located. It serves as both the magnetic head 3 and the reproducing circuit 9.

Next, an explanation will be given of the operation of this device W when a recorded video signal is to be recorded from a subsequent track using the recording medium 1 on which data has been recorded up to an intermediate track. It is assumed that recorded video signals have already been recorded on the recording medium 1 from the first track to the nth track. It is also assumed that the magnetic head 3 is on the first track of the recording medium 1. A recording medium 1 is attached to the shaft of a motor 2 of this device, and when the motor 2 starts rotating at a specified rotational speed, a magnetic head 3 reproduces the recorded signal from the track.

This reproduced signal is supplied to a reproduction circuit 9 and amplified, and the output signal of the reproduction circuit 9 is supplied to a threshold hold circuit 10. The threshold circuit 10 detects whether or not the first track has been recorded based on the level of the output signal of the reproduction circuit 9, and if the level is above a certain level, it provides a recording area detection signal to the automatic movement switch 11. The automatic movement switch 11 gives an automatic track movement command (#i) to the drive circuit 5 according to the recording area detection signal.The drive circuit 5 drives the movement mechanism 4 according to the automatic track movement command signal, and moves the magnetic head 3 to the next position. Move to second track.

It is assumed that this operation is repeated n times and the magnetic head 3 moves to the (n+1)th track. This track still has 1l recorded.
Il! Since the IiI signal is not recorded, the reproduction circuit 9
has no output signal and terminates further operations. In this way, the magnetic head 3 is moved to the recording start track and becomes ready for recording.

In addition, in this state, when the head signal selection switch 7 is connected to the b side to record a recording video signal, and then the head signal selection switch 7 is connected to ailv, the same @ operation as above is performed, and the recording medium At the same time as confirming that the recording video signal has been recorded on the track 1, the magnetic head 3 can be moved to the next track, and recording can be performed sequentially.

In the above embodiment, in order to detect the recording area of the track, the conventional apparatus is equipped with a means for reproducing the signal recorded on the track where the magnetic head 3 on the recording medium 1 is located. Although the magnetic head 3 and reproducing circuit 9 are shown to be used together, they may be provided separately.

[Effects of the Invention] As described above, according to the present invention, a recording method for detecting a recording area by reproducing a signal recorded on a track where a magnetic head is located on a recording medium, in addition to the conventional recording medium. Since an area detecting means and an automatic moving command signal generating means for outputting an automatic track moving command signal in response to the output signal of the recording area detecting means are added, it is possible to record up to an intermediate track and then continue again onto a recording medium. When recording, the magnetic head can be moved to an unrecorded track reliably and quickly to start recording a signal, and even when recording normally, recording can be performed reliably and quickly.

[Brief explanation of the drawing]

FIG. 1 shows a conventional magnetic recording and reproducing system 1111w1 for video signals.
FIG. FIG. 2 shows I! which is an embodiment of this invention. FIG. 1 is a block diagram of a magnetic recording/reproducing device for a 1llII signal. 1 is a recording medium, 2 is a motor, 3 is a magnetic head, 4 is a moving body, 41 is a rack, 42 is a pinion, 43 is a motor, is a drive circuit, 6 is a manual movement switch, 7 is a head signal switch Switch, 8 is 1111! Recording circuit, 9 is reproduction circuit, 1o is threshold circuit, 11
is an automatic moving switch. Agent Masuo Oiwa Figure 1

Claims (2)

[Claims] (1) A recording medium having concentric tracks for recording signals, a drive source for rotationally driving the recording medium, and a 1kI&! a magnetic head for recording and reproducing the signal on a recording medium; a moving means provided with the magnetic head and moving the magnetic head in a direction intersecting the tracks on the recording medium; and a drive for driving the moving means. a circuit, a manual movement command signal generation means for outputting a manual track movement command signal for driving the drive circuit, a recording circuit, a reproduction circuit, and a switch for switching connection of the magnetic head to the recording circuit or the reproduction circuit. magnetic recording and reproducing means
1l! recording area detecting means for reproducing the signal recorded on the track on which the magnetic head is located and detecting a recording area; and controlling the drive circuit in response to an output signal of the recording area detecting means. What is claimed is: 1. A magnetic recording and reproducing device comprising: automatic movement command signal generating means for outputting an automatic track movement command signal for driving. (2) Claim 1, wherein the signal is a video signal
Magnetic recording/reproducing side L described in section