JP2779039B2 - Optical recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording apparatus for recording / reproducing information by driving an optical recording medium such as an optical disk and an optical card. The present invention relates to a means for keeping recorded information confidential.

[Conventional technology]

The optical recording medium has a feature that the required recording amount is much larger than other information recording mediums. However, an optical recording apparatus which performs recording / reproducing of confidential information by mounting the optical recording medium only to that has been featured. Strict confidentiality functions are required.

Conventionally, as security means for optical recording, a security code is recorded in advance on an optical recording medium, and the security code entered by the user is compared with the security code recorded in advance. There is known an optical recording medium that determines whether or not the optical recording medium is owned by a user who operates the optical recording medium.

[Problems to be solved by the invention]

However, since the above-mentioned password is recorded in a certain position on the optical recording medium in a certain manner, the recording / writing of the optical recording medium is performed.
It can be easily read by those who have the knowledge and the device for reproduction.

Also, except for the special case where the data of the defective portion is moved to the replacement sector, the recording data is usually recorded in the same order in the continuous recording area of the optical recording medium. When the data is read out using the data, the original data can be reproduced by itself, and the security protection function can hardly be exhibited.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an optical recording apparatus having a more advanced security function for information recorded on an optical recording medium.

[Means for solving the problem]

In order to achieve the above object, the present invention provides, in an optical recording apparatus, a drive unit for an optical recording medium, a recording / reproducing apparatus for writing a signal to the optical recording medium and reading a signal from the optical recording medium. A non-volatile storage unit that stores a user's password and a recording area of a scramble procedure corresponding to the password, a scramble unit that generates a different scramble procedure for each password, and rearranges the recording data in sector units; A recording area setting means for setting a recording area for the scrambling procedure, a descrambling means for rearranging the reproduction data in the original order in accordance with the scrambling procedure, and a system control means for performing a system control of each device are provided.

Prior to starting the recording / reproducing operation on the optical recording medium, the password input by the user is collated with the password recorded on the optical recording medium, and if they match, the password is read from the optical recording medium. The scramble procedure corresponding to the personal identification number is read out, and the recorded data is scrambled according to the scramble procedure, or the reproduced data is descrambled in the original order. If the password input by the user does not match the password recorded on the optical recording medium, the data recording / reproducing operation is automatically prohibited.

[Action]

As described above, if an apparatus such as an optical recording medium analyzer is used, data recorded on the optical recording medium can be read. However, if the recording data is scrambled, the original data cannot be restored from the read data unless the scrambling procedure is known.

In addition, the scramble procedure is not recorded at a fixed position on the optical recording medium, but is appropriately recorded in an area set by the recording area setting means. Therefore, it is difficult to read the scramble procedure from the optical recording medium.

Therefore, even if a person other than the user obtains the optical recording medium, normal data cannot be reproduced unless the personal identification number is known, thereby exhibiting an advanced security maintaining function.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram of an optical recording apparatus according to one embodiment. As shown in FIG. 1, the optical recording apparatus according to the present embodiment includes a spindle motor 2 for driving an optical disc 1 to rotate and a recording medium such as a laser. An optical head 3 for focusing reproduction light on the recording surface of the optical disc 1, a signal modulation / demodulation device 4, a microcomputer 5, a non-volatile storage means 6, a display 7, and a keyboard 8. Have.

As an example of the optical disk 1, as shown in FIG.
The recording area 9 has a plurality of sectors 10a, 10b, 10c,.
., 10x, which is used to record information by specifying its address for each sector. Although FIG. 2 shows an example in which the recording area 9 is equally divided from the innermost part to the outermost part, the number of divisions of the recording area 9 changes according to the radius area. The same applies to the type of optical disk.

Since the spindle motor 2, the optical head 3, and the modulation / demodulation device 4 are generally mounted on the optical recording device and are not the gist of the present invention, the description is omitted.

The micro computer 5 includes a scramble unit 5a for rearranging recording data in sector units, and a scramble unit 5a.
A recording area setting means 5b for setting a recording area (for example, an address of a sector) of the optical disk 1 on which the scrambling procedure set in 5a is to be recorded, and a descrambling for rearranging reproduction data in the original order according to the scrambling procedure The means 5c comprises the spindle motor 2, the optical head 3, and the system control means 5d for controlling the system of the modulation / demodulation device 4.

The non-volatile storage means 6 stores a user's personal identification number and a recording area of the scramble procedure recorded on the optical disk 1 corresponding to the personal identification number. For example, a random access memory with battery back-up ( RA
M) and electrically erasable programmable read only memory (E
EPROM) can be used.

Hereinafter, the operation of the optical recording apparatus according to the embodiment will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 shows a signal write operation, and FIG. 4 shows a signal read operation.

In FIG. 3, when the optical disk 1 to be used is mounted on the spindle motor 2 and the keyboard 8 is operated to issue a command to drive the optical disk 1, the spindle motor 2 is started, and the optical disk 1 It rotates in the rotation mode (step S-1).

Next, a selection menu as to whether or not the user has already registered his / her personal identification number is displayed on the display 7 (step S-2).

When the registered menu is selected by operating the keyboard 8 and its password is inputted (step S-3), the table of the registered password is read out from the non-volatile storage means 6, and the inputted password is inputted. Is checked (step S-4).

If the input personal identification number is already registered in the nonvolatile storage means 6, the recording area of the scramble procedure stored corresponding to the personal identification number is read from the nonvolatile storage means 6 (step S-). 5).

Then, the optical head 3 is driven according to this information,
The scramble procedure recorded on the optical disk 1 is read (step S-6).

Thereafter, the write signal is scrambled in sector units according to the scramble procedure, and the signal is written to the optical disk 1 via the optical head 3 and the modulation / demodulation circuit 4 (step S-7).

FIG. 5 is a diagram showing an example of a scrambling procedure,
Data in the order of 1 → 2 → 3 → 4 → 5 is 2 → 4 → 1
10 consecutive sectors rearranged in the order of → 5 → 3
written in a to 10e.

After the writing of the predetermined signal is completed, the keyboard 8
By operating the and inputting an end signal, the system can be ended.

If an unregistered menu is selected in step S2, a selection menu as to whether or not to newly register a password is displayed on the display 7 (step S-).
8).

If there is an intention to register, after selecting the registration menu, an arbitrary password is selected and input through the keyboard 8 (step S-9).

The scrambling means 5a receives the password and generates a scrambling procedure, and the recording area setting means 5b outputs an area in which the scrambling procedure generated by the scrambling means 5a is to be recorded. Then, the optical head 3 and the modulation / demodulation circuit 4 are driven, and the scramble procedure is written in the area (step S-10).

The recording area of this scramble procedure is registered in the non-volatile recording means 6 together with the password (step S).
−11).

Thereafter, the write signal is scrambled according to the scramble procedure, and is written to the optical disc 1 via the optical head 3 and the modulation / demodulation circuit 4 (step S-).
7).

If the user does not intend to register the personal identification number in step S-8, the system can be terminated by operating the keyboard 8 and instructing the user to do so.

Each of the above operations is performed based on a program stored in the system control unit 5d.

Hereinafter, the signal reading operation will be described with reference to FIG.

In FIG. 4, when the optical disk 1 to be used is mounted on the spindle motor 2 and the keyboard 8 is operated to issue a command to drive the optical disk 1, the spindle motor 2 is started and the optical disk 1 is moved to a predetermined position. It rotates in the rotation mode (step S-1).

When a password is input by operating the keyboard 8 (step S-2), a table of registered passwords is read from the non-volatile storage means 6, and collation with the input password is performed (step S2). S-3).

If the input personal identification number is registered in the non-volatile storage means 6, the recording area of the scramble procedure stored corresponding to the personal identification number is read from the non-volatile storage means 6 (step S-). 4).

Then, the optical head 3 is driven according to this information,
The scramble procedure recorded on the optical disc 1 is read (step S-5).

Hereinafter, the descrambling means 5c descrambles the readout signal with reference to the scramble procedure, rearranges the readout signal in the original order, and displays it on the display 7 (step S-).
6).

That is, in the example of FIG. 5, the signal written on the optical disk in the order of 2 → 4 → 1 → 5 → 3 is changed from the original 1 →
It is rearranged in the order of 2 → 3 → 4 → 5.

In step S-3, if the password of the user is not registered in the non-volatile storage means 6, the signal reading is automatically prohibited and the system is terminated.

The optical recording apparatus of the above embodiment scrambles a signal in sector units and records the signal on the optical disk. Therefore, even if the signal is read from the optical disk using an apparatus such as an optical disk analyzer, the signal is read as long as the scrambling procedure is not known. Data cannot be restored.

Also, the scrambling procedure is appropriately recorded in the area set by the recording area setting means, so that the scrambling procedure is recorded in a form interleaved with general data, and the scrambling procedure is read from the optical recording medium. Is difficult.

Therefore, even if a person other than the user obtains the optical recording medium, normal data cannot be reproduced unless the personal identification number is known, thereby exhibiting an advanced security maintaining function.

Although the optical disk device has been described as an example in the above-described embodiment, the gist of the present invention is not limited to this. For example, an optical card device that records / reproduces information using an optical card is used. It can also be applied to the optical recording device.

Further, in the above embodiment, the case where the scrambling means 5a, the recording area setting means 5b, the descrambling means 5c, and the system control means 5d are constituted by the same micro computer has been described as an example, but the gist of the present invention is However, the present invention is not limited to this, and each of the means may be constituted by a separate microcomputer.

Further, in the above-described embodiment, the case where the display 7 and the keyboard 8 are provided as the external terminal devices has been described. However, other external terminal devices may be appropriately combined instead or in combination therewith.

[Effects of the Invention] As described above, according to the present invention, a scrambled signal can be recorded on an optical recording medium and the scrambling procedure can be inserted between general data signals. The information cannot be read from the optical recording medium unless the personal identification number necessary for reading the procedure is known, and an advanced security maintaining function is exhibited.

[Brief description of the drawings]

FIG. 1 is a block diagram of an optical recording apparatus according to an embodiment of the present invention, FIG. 2 is a plan view showing an example of an optical recording medium applicable to the present invention, and FIG. 3 explains a signal writing operation. FIG. 4 is a flowchart for explaining a signal reading operation, and FIG. 5 is an explanatory diagram showing an example of a scrambling procedure. DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Spindle motor, 3 ... Optical head, 4 ... Modulation / demodulation device, 5 ... Microcomputer, 6 ... Non-volatile storage means, 7 ... Display, 8 ... Keyboard .

Claims (4)

(57) [Claims] An optical recording medium driving means, a recording / reproducing apparatus for writing a signal to the optical recording medium and reading a signal from the optical recording medium, a password for a user and a password corresponding to the password. Non-volatile storage means for storing the recording area of the scramble procedure, scramble means for generating a different scramble procedure for each password, and rearranging the record data in sector units, and recording area setting means for setting the recording area for the scramble procedure An optical recording apparatus comprising: a descrambling unit for rearranging reproduction data in an original order according to a scrambling procedure; and a system control unit for performing system control of each device. 2. An optical recording apparatus according to claim 1, wherein said nonvolatile storage means is a random access memory (RAM) with battery backup. 3. An optical recording apparatus according to claim 1, wherein said nonvolatile storage means is an electrically erasable programmable read only memory (EEPROM). 4. An optical recording apparatus according to claim 1, wherein said scrambling means, scrambling procedure recording means, descrambling means, and system control means are constituted by the same micro computer.