JP2850847B2 - Erroneous erasure prevention device for optical disk device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing erroneous erasure of a still image file in an optical disk apparatus, and more particularly, to an apparatus for erasing a still image file in an entire recording area of an optical disk medium without using a mechanical erasure prevention method. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an erroneous erasure prevention device for an optical disk device that performs erasure prevention by recording an image in an erasure prevention form.

2. Description of the Related Art In an optical disk device, recorded information may be erased by mistake. Therefore,
It is necessary to provide an erroneous erasure prevention function. In order to prevent such erroneous erasure of the optical disk device without using the mechanical erasure prevention method, a method of recording an erroneous erasure prevention signal together with recording information in advance is adopted.

In the case where the erroneous erasure prevention in the optical disk device is performed by recording the erroneous erasure prevention signal, the erroneous erasure prevention signal and the recording information are always recorded coexisting, and only one of them is recorded. It is necessary to prevent this from occurring.

[0004]

2. Description of the Related Art Conventionally, as a method for preventing erroneous erasure of a recording medium, as a method for preventing mechanical erasure, in the case of a magnetic tape of a VTR or an audio tape recorder, a part of a case for accommodating a medium is cut off or an optical disk is removed. In the case of a medium, a method is often used in which the apparatus side is set to a recording prevention state by, for example, closing a transmission window to prevent erroneous erasure of the entire medium.

As an erroneous erasure prevention device using an erroneous erasure prevention signal, for example, there is one disclosed in Japanese Patent Application Laid-Open No. Sho 59-116948. In this prior art, a method is employed in which an erroneous erasure prevention signal is recorded outside the information recording area of a magnetic tape in a VTR.

FIG. 4 is a block diagram showing an example of a conventional device for preventing erroneous erasure. Hereinafter, the related art will be described with reference to FIG. At the time of recording, a recording information signal input from an external input terminal 36 is converted into a recording format by a recording data conversion circuit 35 and is applied to a recording / reproducing head 31 via a recording control circuit 33 and a recording gate switch 32. And is recorded on the magnetic tape 7.

When the erroneous erasure prevention signal is recorded, the changeover switch 73 is turned on by operating the operation panel 38 so that the erroneous erasure prevention signal generated from the prevention signal generation circuit 37 is recorded. The data is recorded on the magnetic tape 7 via the head 71.

When information is to be recorded on a magnetic tape, it is determined whether or not an erroneous erasure prevention signal is recorded in a recording area. In other words, the erasure prevention signal reproducing head 72 reproduces the erroneous erasure prevention signal recording area, and the output signal is applied to the prevention signal determination circuit 13 via the amplifier 12 to make a determination.

When the erroneous erasure prevention signal is detected, a signal is sent to the gate switching signal generation circuit 14 so that the recording control signal 61 is transmitted from the gate switching signal generation circuit 14 to the erasing gate switching switch 22 and the recording gate switching switch. 32, the erasing signal from the erasing control circuit 23 and the input of the recording data from the recording control circuit 33 are cut off, and the execution of erasing and recording is canceled.

In Japanese Patent Application Laid-Open No. 1-0494985, in a still video system, when there is an image that is not desired to be erased after the end of shooting of a still video film, an erasure inhibiting signal is recorded by a magnetic head for shooting. Accordingly, it is disclosed that the output of the erase signal is prohibited.

Further, in Japanese Patent Application Laid-Open No. 63-187402, an erasing head is provided in a magnetic disk device at a position preceding a writing / reading head of a magnetic disk. It is disclosed that the control of the end of the erasing by the preceding erasing head and the end of the writing by the writing / reading head are performed at timings corresponding to the intervals.

[0012]

A problem with the first prior art is that an erroneous erasure prevention signal is not recorded when one of the erasure prevention signal recording head and the recording / reproducing head fails. Since a recording state occurs, recording without an erroneous erasure prevention function is performed.On the contrary, only an erroneous erasure prevention signal is recorded without recording original information. May cause a recording state of This is a problem that occurs because the head that records the original information and the head that records the erroneous erasure prevention signal are separate.

Further, there is a problem that whether recording is possible or not is not known until immediately before the recording area. This is because the operation of previously detecting the presence or absence of the erasure prevention signal and the reading of information by the recording / reproducing head are performed in different recording areas, for example, in the same cycle by the preceding reading unit. .

On the other hand, the second conventional technique is to inhibit erasure of information recorded after recording information, and cannot be applied to the case where information recording and recording of an erroneous erasure prevention signal are simultaneously performed. Furthermore, the third related art relates to control when erasing information already written prior to writing information, and cannot be applied to recording of an erroneous erasure prevention signal.

An object of the present invention is to solve such a problem of the prior art. In an optical disk device, an erroneous erasure prevention signal and an information signal are recorded via the same head, thereby obtaining a still image. The purpose is to prevent erroneous erasure of information.

It is another object of the present invention to provide an optical disk device that has a read ahead head and that can know a recordable area in advance. Still another object of the present invention is to provide an optical disc device capable of recording a still image in the entire recordable area in a state of preventing erasure.

[0017]

In the apparatus for preventing erroneous erasure of a still image on an optical disk according to the present invention, at the time of recording a still image on an optical disk, the recording information and the erasure prevention signal are recorded in the same recording head in one recording area. Record by. In addition, a precedence reading unit is provided so that an erroneous erasure prevention signal can be read in advance when recording information.

As described above, since the information signal and the prevention signal are recorded in one recording area by the same recording head, a state in which only one of the signals is recorded and the other signal is not recorded is generated. Can be prevented. In addition to the recording / reproducing head, it is possible to determine in advance whether recording is possible or not in the recording area by previously detecting information of one recording area in the disk by the preceding reproducing head. Therefore, even during information recording, a recordable area can be searched.

Hereinafter, specific means for solving the problems of the present invention will be described. FIG. 1 shows the basic configuration of the present invention.

(1) Recording / reproducing on optical disk medium
Recording and playback of input information for each recording area via the head
The recording unit to be used and the position to reproduce the recording area different from the recording unit
And a predetermined prevention signal recording area for each storage area.
Read and record according to the contents of the prevention signal recording area.
A read-ahead section for outputting a recording control signal;
When the recording control signal output from the storage unit indicates that recording is possible
Information recorded via an erase head prior to data recording
And an erasing unit for erasing the data.

In addition, the recording unit records information in the prevention signal storage area.
A prevention signal generation circuit for generating an erroneous erasure prevention signal to be recorded;
The input of this prevention signal generation circuit and the input of input information
Turn off according to the recording control signal output by the reading unit.
And a recording signal changeover switch for changing over.

According to the present invention, the changeover switch further comprises:
When the recording control signal indicates that recording is possible, the prevention signal recording area and
Switch to the data recording area to switch to recording / playback.
And an erasure prevention signal and input information.

[0023]

FIG. 2 shows an embodiment of the present invention. Hereinafter, embodiments of the present invention,
This will be described in detail with reference to FIG.

As shown in FIG. 2, the preceding reproducing head 11 in the preceding reading section 1 is a recording / reproducing head 3 of the recording section 3.
1 and a different recording area. The preceding reproduction head 11 reads data recorded in a prevention signal recording area 53 on one recording area 51 in the optical disk medium 5, and outputs the data through an amplifier 12 to the prevention signal determination circuit 1.
Add to 3. Thus, the prevention signal determination circuit 13 determines whether information recording is possible or not. The gate switching signal generation circuit 14 outputs a recording control signal 61 based on the determination result of the prevention signal determination circuit 13, and controls each gate for information recording and switching of the recording signal.

In the erasing section 2, when the erasing head 21 comes to the prevention signal recording area 53 and the data recording area 54 of one recording area 51, the erasing gate switch 22 is turned on based on the recording control signal 61. That is, the signal from the erasure control circuit 23 is added to the signal from the reproduction control circuit 41 to erase one recording area 51.

Similarly, in the recording section 3, when the recording / reproducing head 31 comes to the prevention signal recording area 53 and the data recording area 54, the recording gate changeover switch 32 is turned on based on the recording control signal 61. Then, the signal from the recording control circuit 33 is added to the signal from the reproduction control circuit 41 to record in one recording area 51.

The information signal is input from an external input terminal 36 and is converted into a recording format in a recording data conversion circuit 35. On the other hand, based on a user's selection of a selection switch (not shown) on the operation panel 38, the prevention signal generating circuit 37 outputs a recording prevention signal or an erasure prevention signal encoded as a recordable signal.

The recording signal changeover switch 34 is controlled by a recording control signal 61 from the gate changeover signal generating circuit 14 so that an information signal is recorded in a data recording area 54 and an erroneous erasure prevention signal is recorded in a prevention signal recording area 53. The recording signal is switched so as to be recorded in the area of.

Next, the operation of the embodiment of the present invention shown in FIG. 2 will be described. FIG. 3 shows the timing of each control signal in the circuit of FIG.

The state of the data read from the preceding reproduction head 11 and recorded in the prevention signal recording area 53 on one recording area 51 is added to the prevention signal discriminating circuit 13 via the amplifier 12 to enable recording. , And the address in the address area 52 is determined. The gate switching signal generation circuit 14 sends the information of the recordable area to the CPU 63 based on the determination result and, at the same time, sends a recording control signal 61 for controlling on / off switching of the recording gate to the erasing section 2 and the recording section 3. send.

As shown in FIG. 3, when the erasing head 21 and the recording / reproducing head 31 are in the non-recordable area indicated by the non-erasable signal 53b, the recording control signal 61 becomes high level. Gate switch 22
And the recording gate changeover switch 32 is turned off, so that erasure and information recording are not performed and the reproduction state is maintained.

Subsequently, when the erasing head 21 and the recording / reproducing head 31 are in the recordable area indicated by the erasable signal 53a, the recording control signal 61 is at a low level. The recording gate changeover switch 32 is turned ON, and the erasing head 21 is turned on.
And the recording / reproducing head 31 in the erased and recorded state,
An erasable signal 53a is recorded in the prevention signal recording area 53 of the optical disk medium 5, and information is recorded in the data recording area 54.

At this time, the recording / reproducing head 31
When the recording signal switching control signal 62 from the U63 side is at the high level, the erroneous erasure prevention signal created by the prevention signal generation circuit 37 is recorded in the prevention signal recording area 53 based on the selection from the operation panel 38. When the recording signal switching control signal 62 is at a low level, the external input terminal 36
The information signal generated by the conversion by the recording data conversion circuit 35 based on the input from is recorded in the data recording area 54.

[0034]

As described above, according to the present invention, when the changeover switch indicates that the recording control signal indicates that recording is possible,
To the protection signal recording area and data recording area.
The recording / reproducing head to prevent accidental erasure and input information.
Information, an erroneous erasure prevention signal and an information signal are recorded.
The recording head is the same, which prevents
Signal and information signal only
Erroneous erasure of an optical disk device that is unprecedented
A prevention device can be provided.

Further, according to the present invention, since the information signal and the erroneous erasure prevention signal are recorded in the same recording area and the erroneous erasure prevention signal is reproduced in advance, the recordable area is recorded while performing the recording. It will be possible to search in advance.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of the present invention.

FIG. 2 is a diagram showing one embodiment of the present invention.

FIG. 3 is a diagram showing the timing of each control signal in the circuit of FIG.

FIG. 4 is a block diagram showing an example of a conventional erroneous erasure prevention device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 preceding reading unit 2 erasing unit 3 recording unit 5 optical disk medium 11 preceding reproducing head 13 prevention signal discriminating circuit 21 erasing head 31 recording / reproducing head 34 recording signal switching switch 37 prevention signal generating circuit 51 recording area 53 prevention signal recording area 54 data Recording area

Claims (1)

(57) [Claims] 1. An optical disk medium for recording / reproducing
Record / playback of input information for each recording area via the
Recording section, and a position for reproducing a recording area different from the recording section.
A predetermined prevention signal recording area for each storage area
And according to the contents of the prevention signal recording area.
A pre-reading unit that outputs a recording control signal;
When the recording control signal output from the
Prior to the recording of the data,
An erasing section for erasing recorded information, wherein the recording section records an erroneous erasure in the prevention signal storage area
A prevention signal generation circuit for generating a prevention signal, and the prevention signal
The input of the generation circuit and the input of the input information are read ahead.
Switching according to the recording control signal output by the taking section
A recording signal changeover switch that indicates that the recording control signal is recordable.
When it corresponds to the prevention signal recording area and the data recording area
To switch the recording / reproducing head to the erroneous erasure prevention signal.
A device for preventing erroneous erasure of an optical disk device, characterized by supplying a signal and input information .