JPS60193138A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the number of demodulating/modulating circuits to one to simplify the constitution by constituting a device having the dubbing function so that the modulated signal detected by a read head is recorded on a magnetic disc through a write head as it is. CONSTITUTION:When picture information recorded on one magnetic disc is dubbed on the other magnetic disc, the modulated picture signal detected by a read head 5 passes a head amplifier 6 and is subjected to required signal correction in a correcting circuit 32 without being demodulated and is inputted to a recording amplifier 12 and is recorded on the magnetic disc by write heads 13 and 34. When the reproduced signal is outputted to the external, a switch SW attached to a demodulating/modulating circuit 31 is turned on to operate this circuit 31 as a demodulating circuit, and the output of the head amplifier 6 is outputted as a video signal to the external through a route indicated by solid lines. When the input signal from an input terminal 33 is recorded, the switch SW is turned off to operate the demodulating/modulating circuit 31 as a modulating circuit, and the input picture signal is recorded on the magnetic disc through a route indicated by broken lines by heads 13 and 34.

Description

Detailed Description of the Invention (Technical Field) The present invention provides a magnetic medium drive device and a recording/reproducing head.
The present invention relates to a magnetic recording/reproducing device having at least one magnetic recording/reproducing device.

(Prior Art) In recent years, with the progress and development of semiconductor technology and electronics, image recording devices using solid-state image sensors as image carrying means have come to be used.

An example of this type of device is an electronic still camera.

An electronic still camera modulates the image signal output of a solid-state image sensor and writes the modulated image signal to a storage device such as a magnetic disk. The written image is read from a magnetic disk or the like as necessary, demodulated, and then reproduced as an image signal. A magnetic recording/reproducing device is one in which both means for writing information onto the magnetic disk described above and means for reading and reproducing the written information are built into one device.

Some of these magnetic recording and reproducing devices are equipped with two or more magnetic disks and have a function of dubbing the contents of one magnetic disk to the other magnetic disk. FIG. 1 is a block diagram showing an example of a conventional magnetic recording/reproducing apparatus of this type. In the figure, 1.2 is a magnetic disk, 3.4 is a motor that rotates these magnetic disks 1 and 2, respectively, 5 is a magnetic head (hereinafter referred to as a read head) for reading information recorded on the magnetic disk 1, and 6 is a magnetic head for reading information recorded on the magnetic disk 1. A head amplifier 7 for amplifying the pickup signal of the successive head 5 is a demodulation circuit that receives the output of the head amplifier 6 and demodulates the signal read from the magnetic disk 1 into the original image information signal. The demodulation circuit 7 outputs a demodulated video signal.

8 is a PG that detects the center of the PG yoke of the magnetic disk 1.
Coil 9 is a first servo control circuit that receives a detection signal from the PG coil, centers the PG yoke, and controls the rotational phase of the motor 3; 10 is a first servo control circuit that causes the servo control circuit 9 to rotate the motor 3; A reference clock generator that provides clock pulses. 11 is a modulation circuit that receives the output (video signal) of the demodulation circuit 7 and modulates the image signal again; 12 is a recording amplifier that receives the output of the modulation circuit 11; and 13 is a magnetic circuit driven by the recording amplifier 12. This is a write magnetic head (hereinafter referred to as the sending head) that records an image on the disk 2.

14 is a PG coil that detects the center of the PG yoke of the magnetic disk 2 like 8, and 15 is a second servo that receives the detection signal of the PG coil 14, locates the center of the PG yoke, and controls the rotational phase of the motor 4. The control circuit 16 is a synchronization signal separation circuit that separates a synchronization signal from the output of the demodulation circuit 7 to generate a clock, and its output is given to the second servo control circuit 18 as a clock signal.

In the conventional device configured as described above, when dubbing image information from one magnetic disk 1 to the other magnetic disk 2, after the image information recorded on the magnetic disk 1 is picked up by the read head 5, the demodulation circuit 7 The original image signal is restored, modulated again by the modulation circuit 11, and then written onto the magnetic disk 2 by the write head 13 for recording. As described above, since the conventional apparatus is configured to demodulate and modulate the image signal, it requires the demodulation circuit 7 and the modulation circuit 11, respectively, and has the disadvantage that the circuit configuration becomes complicated.

By the way, as shown in Figure 2, video ICs commonly used today share a circuit for demodulation and modulation, and can be used for both recording and playback by simply changing the switch SW. . The changeover switch SW can be switched, for example, so that when the contact is on, it is used for reproduction (demodulation circuit), and when the contact is off, it is used for recording (modulation circuit). Or it may be the other way around. If this video IC were to be used in the conventional circuit shown in Figure 1, two video tCs would be required for demodulation and modulation, since the conventional device must perform recording at the same time as playback as described above. Become. FIG. 3 is a diagram illustrating an example of using the video IC in the circuit shown in FIG. 1. Components that are the same as those in FIG. 1 are designated by the same numbers. In the figure, 21 and 22 are the video AICs (demodulation/modulation circuits) mentioned above. In the first demodulation/modulation circuit 21, the changeover switch S W + is turned on, and the demodulation/modulation circuit 21 operates as a demodulation circuit for reproduction. On the other hand, the output of the first demodulation/modulation circuit 21 (
The second demodulation/modulation circuit 22 receiving the video signal operates as a modulation circuit with the changeover switch S W 2 turned off. As mentioned above, in the case of conventional equipment, the video IC
It can be seen that two are required, making the circuit complicated.

(Object of the Invention) The present invention has been made in view of the above points, and its purpose is to realize a magnetic recording/reproducing device with a simple configuration that can be constructed with a single demodulation/modulation circuit. There is a particular thing.

(Structure of the Invention) The present invention, which achieves the above object, includes a read head that reads information recorded on a magnetic medium, a recording amplifier that receives the output of the readout head, and a recording amplifier that uses the output of the recording amplifier. The apparatus is characterized in that it includes a write head that is driven to record on a magnetic medium, and an output signal from the read head is applied to a recording amplifier.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 4 is a configuration diagram showing an embodiment of the present invention.

Components that are the same as those in FIG. 3 are designated by the same numbers.

In the figure, 31 is a demodulation/modulation circuit (video JIC) that receives the output of the head amplifier 6, 32 is a correction circuit that receives the output of the head amplifier 6 and corrects the signal, and 33 is an input terminal that receives an external video signal. , 34 is the recording amplifier 12
a second write head driven by the output of the second write head. The second write head 34 is provided for writing image information onto the second magnetic disk when two magnetic disks for image recording are provided. The operation of the circuit configured as described above will be explained as follows.

First, a case will be described in which image information about to be recorded on one magnetic disk is dubbed onto the other magnetic disk. In this case, the modulated image signal detected by the read head 5 passes through the head amplifier 6 and then enters the correction circuit 32 without being demodulated. After the correction circuit 32 performs necessary signal correction (for example, correction of the frequency characteristics of the input signal), the signal enters the recording amplifier 12 and the write head 13.
4, the image is recorded directly onto the recording magnetic disk.

That is, when the purpose is only for dubbing, there is no need to record input signals from the outside or output reproduced signals to the outside, so the modulated image signal picked up by the read head 5 is Head amplifier 6, correction circuit 32
and the write head 13.3 via the recording amplifier 12.
4, J is written as is to the magnetic disk. According to the present invention, it is no longer necessary to perform vII toning on a detected modulated image signal as a -H image signal, modulate it again, and record it, and the circuit configuration is simplified. Note that the correction circuit 32 may be omitted depending on the case, and in this case, the circuit is further simplified.

In addition, when outputting the reproduced image signal to the outside, it is preferable to turn on the changeover switch SW attached to the demodulation/modulation circuit 31 and use the demodulation/modulation circuit 31 as a W copper circuit.

In this case, the output of the head amplifier 6 is the demodulation/modulation circuit 3
1 and is reproduced as a video signal, after which it is output as a video signal to the outside through the system shown by the solid line in the figure. On the other hand, when an input signal input from the outside via the input terminal 33 is recorded on the magnetic disk, the changeover switch SW is turned off and the 41m11/modulation circuit 31 is used as a modulation circuit. In this case, the input image signal (video signal) input from the input terminal 33 enters the demodulation/modulation circuit 31 through the system indicated by the broken line in the figure, and after being modulated, the input image signal (video signal) is input to the recording amplifier 12.
to go into. Images are then recorded on the magnetic disk from the write heads 13 and 34.

In the above description, the case where there are two magnetic disks for recording has been explained as an example, but the number does not have to be limited to two and may be any number. In addition, image signals can be recorded on magnetic disks.
Although the reproducing system has been described, the signal may be an audio signal, a digital signal, etc. other than an image signal, and the medium may also be a magnetic tape, a magnetic drum, etc. other than a magnetic disk.

(Effects of the Invention) As described above in detail, according to the present invention, by adopting a configuration in which a modulated signal detected by a read head is recorded as an image on a magnetic disk via a write head,
It is possible to realize a simple magnetic recording/reproducing device with just one demodulation/modulation circuit. J to the present invention
: When dubbing between magnetic disks, cutting unnecessary signals, and inserting necessary signals, the circuit configuration can be simplified without sacrificing the functions of conventional magnetic recording and reproducing devices. It can be done. Furthermore, in the case of the present invention, if the purpose is only to dub image signals of the magnetic medium section, the demodulation/modulation circuit itself is not required, so the circuit can be further simplified.

[Brief explanation of the drawing]

Fig. 1 shows the configuration of the conventional device, and Fig. 2 shows the configuration of the conventional device.
A diagram showing the configuration of a modulation circuit (videt 711C); FIG. 3 is a configuration diagram showing an example in which a video IC is used in the conventional device shown in FIG. 1;
FIG. 4 is an IR diagram showing one embodiment of the present invention. 1.2...Magnetic disk 3.4...Motor 5...Read head 6...,
Head amplifier 7... Demodulation circuit 8.14... PG coil 9.15... Servo control tglr810...
・Reference clock generator 11... Modulation circuit 12... Recording amplifier 13.34
...Write head 16...Synchronization signal separation circuit 21.22.31...Return! l/modulation circuit 32...
Correction circuit 33...Input terminal SW, SWt, SW2
... Changeover switch patent applicant Roku Konishi Photo Industry Co., Ltd. Agent Patent attorney Fuji Ijima 1 person

Claims (3)

[Claims] (1) A read head that reads information recorded on a magnetic medium, and a recording amplifier that receives the output of the read head.
1. A magnetic recording/reproducing device comprising: a write head driven by the output of the recording amplifier to record on a magnetic medium; and an output signal of the read head is applied to the recording amplifier. (2) The magnetic recording and reproducing apparatus according to claim 1, further comprising a correction circuit, and after the output signal of the read head is corrected by the correction circuit, it is applied to the recording amplifier. . (3) A modulation/I adjustment circuit is provided, and a changeover switch is used to reproduce the output signal of the read head or to record an external signal. The magnetic recording and reproducing device described above.