JP2009009679A - Optical disk reproducing system and recording-and-reproducing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk recording-and-reproducing system for specifying and displaying a stained position of an optical disk. <P>SOLUTION: The optical disk recording-and-reproducing system includes: a signal reproducing circuit 5 for outputting an error flag which corrects data error recorded in an optical disk D; a reference mark detector 6 for detecting a reference mark M which is formed previously in a region of disk D; a dirt inspecting section 7 for outputting the information showing a dirty position on the line which connects an angle based on a reference line 16 passing through a reference mark M, the center of the optical disk D, and a dirty position; and a reporting section 8 for displaying the distance and the angle showing the dirty position by the information output from the dirt inspecting section 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disc reproducing apparatus and an optical disc recording / reproducing apparatus capable of detecting a dirt position on an optical disc and specifying the dirt position.

Patent Document 1 describes an optical disc apparatus that removes dirt such as fingerprints and dust adhering to the surface of an optical disc.
That is, in Patent Document 1, after reading an information code and error correction code data from an optical disc, when the error bit number distribution state in the code length unit of the correction result exceeds a predetermined value by the error correction unit, There is described an optical disc apparatus that warns by judging that the state of dirt such as fingerprints and dust is in a limit state, and detects dirt on the optical disc reliably and wipes off the dirt.

JP-A-5-314477

  However, since the contamination of the optical disk is only judged based on the distribution of the number of error bits, it is not shown where the contamination has occurred on the optical disk. It was necessary to find and was complicated. Further, since even if the dirt does not cause an error, the wipe is wiped off, and if the wiped area is large, the area other than the dirty area is also stained, so that the signal deterioration area is widened.

  Also, data is not recorded in the outer area of the optical disc lead-out, but if there is visible dirt in the outer area, the dirt may be wiped off. There is also a problem that the data area inside is also soiled.

Therefore, the present invention has been made to solve the above-described problems. In the case where the dirt position generated on the optical disk is specified and displayed, and the signal on which the dirt is recorded is not deteriorated. An object of the present invention is to provide an optical disk reproducing apparatus and an optical disk recording / reproducing apparatus that reproduce the sound as it is without wiping it off.
An optical disc recording / reproducing apparatus for recording and detecting a visual mark on an optical disc in the outer region of the lead-out so as not to wipe off the dirt when the outer region of the lead-out is dirty is provided.

According to a first aspect of the present invention, there is provided an ECC (Error Correction Code) for outputting reproduction data from a signal read from the optical disk and correcting a data error in an optical disk reproduction apparatus that performs reproduction by irradiating the optical disk with laser light. ), A signal reproduction circuit that outputs an error flag when it cannot be corrected, a reference mark detection unit that detects a reference mark previously formed in an area other than the data area of the optical disc, and contamination on the surface of the optical disc, Based on the error flag output from the signal reproduction circuit, information indicating the position of the dirt by an angle from a reference straight line passing through the reference mark and a distance from the center of the optical disc to the position where the dirt is generated. And a distance indicating the position of the dirt by the information output from the dirt inspection part. And which displays the angle, to provide an optical disk reproducing apparatus, characterized in that the dirt and a notification unit for displaying whether or not the cause errors in the reproduced data.
According to a second aspect of the present invention, there is provided an ECC (Error Correction Code) for outputting reproduction data from a signal read from the optical disk and correcting a data error in an optical disk recording / reproducing apparatus that performs recording or reproduction by irradiating the optical disk with laser light. ), A signal reproduction circuit that outputs an error flag when it cannot be corrected, a signal recording circuit that records a reference mark in an area other than the data area of the optical disk, a reference mark detection unit that detects the reference mark, and the optical disk Based on the error flag output from the signal reproduction circuit, the surface contamination is detected, and the angle from the reference straight line passing through the reference mark and the distance from the center of the optical disc to the position where the contamination occurs. A stain inspection unit that outputs information indicating the position of the stain, and the information output from the stain inspection unit, An optical disc recording / reproducing apparatus, comprising: a notifying unit that displays the distance and the angle indicating the position and displays whether the dirt causes an error in the reproduction data. provide.
According to a third aspect of the present invention, in the optical disc, the reference mark is recorded on an arc that is a part of the first track in an area other than the data area, and an arc that is not a part of the first track The first mark is recorded, and the second mark is recorded on the second track corresponding to a part of the first track on the inner circumference side or the outer circumference side of the first track. A third mark is formed on the second track corresponding to a portion other than a part of one track, and the reflectance of the reference mark and the third mark is higher than that of the first and second marks. 2. The optical disk reproducing apparatus according to claim 1, wherein the optical disk reproducing apparatus is high.
According to a fourth aspect of the invention, the signal recording circuit records the reference mark on a partial arc of the first track in an area other than the data area of the optical disc, and a part of the first track. The first mark is recorded on the other arc, and the second mark is recorded on the second track corresponding to a part of the first track on the inner circumference side or the outer circumference side of the first track. A third mark is recorded on the second track corresponding to a portion other than a part of the first track, and the reflectance of the reference mark and the third mark is the first, 3. The optical disk recording / reproducing apparatus according to claim 2, wherein the optical disk recording / reproducing apparatus is higher than the second mark.
According to a fifth aspect of the present invention, there is provided the optical disc recording / reproducing apparatus according to claim 2, wherein the signal recording circuit forms a visual mark outside the lead-out area of the optical disc.

According to the present invention, a reference mark detection unit that detects a reference mark previously formed in an area other than the data area of the optical disc, and a stain on the surface of the optical disc are detected, and based on an error flag output from the signal reproduction circuit, According to the information output from the stain inspection unit, the stain inspection unit that outputs information indicating the position of the stain according to the angle from the reference straight line passing through the reference mark and the distance from the center of the optical disc to the position where the stain occurs. A distance and angle indicating the position of the dirt are displayed, and a notifying unit for displaying whether or not the dirt causes an error in the reproduction data. If it is displayed and the signal on which the dirt is recorded is not deteriorated, it can be reproduced as it is without wiping off the dirt.
Further, since the signal recording circuit for recording the reference mark in an area other than the data area of the optical disk is provided, it is possible to form a reference mark that can be recorded and can obtain an arbitrary reflected light amount.
In addition, since the reflectance of the reference mark and the third mark is higher than that of the first and second marks, the reference mark can be visually confirmed, so that the position of the stain can be easily specified.
Furthermore, since the visual mark is formed outside the lead-out area, when the dirt is formed outside the lead-out area, the data area can be prevented from being dirty by wiping it off.

Embodiments of the present invention will be described below with reference to FIGS.
FIG. 1 is a block diagram showing an optical disk recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view showing the optical disc when the data area is dirty.
FIG. 3 is a diagram showing the recording power dependence of the reflectance.
FIG. 4 is a plan view showing the optical disc when there is dirt on the outside of the lead-out area.
FIG. 5 is a block diagram showing an optical disk reproducing apparatus according to the embodiment of the present invention.

First, an embodiment of the present invention will be described.
An optical disc recording / reproducing apparatus 1 according to an embodiment of the present invention includes an optical pickup 2 that irradiates a laser beam to reproduce a signal recorded on the optical disc D and irradiates the optical disc D with a laser beam, and a focus. A servo signal processing unit 3 for outputting a signal and a tracking signal to the optical pickup 2, and a recording signal from the recording data supplied from the outside to the optical disc D, and marks M, N, When the signal recording circuit 4 for recording O and P and the signal read from the optical disc D are converted into reproduction data and an ECC (Error Correction Code) for correcting a data error is stored, and this ECC cannot be corrected. And a signal reproduction circuit 5 for outputting an error flag.
Further, the optical disc recording / reproducing apparatus 1 detects the reference mark detection unit 6 for detecting the reference mark M formed in the lead-in area 11 of the optical disc D and the fingerprint 18 on the surface of the optical disc D. When it is determined that the fingerprint 18 deteriorates the signal recorded in the data area 12 based on the output error flag, the fingerprint from the angle θ from the reference line 16 passing through the reference mark M and the center of the optical disc D is obtained. The stain inspection unit 7 that outputs information indicating the position of the fingerprint 18 with a distance r up to 18, and the information output from the stain inspection unit 7 displays the distance r indicating the position of the fingerprint 18 with an angle θ, It has a notification unit 8 for displaying whether or not the dirt causes an error in the reproduction data, and a control unit 9 for controlling the whole.

As shown in FIG. 2, the optical disc D has a center hole 10 at the center, and a lead-in area 11, a data area 12, a lead-out area 13, and an outer peripheral zone Q are sequentially formed outside the center hole 10. ing. The optical disc D is formed with concentric tracks. In the lead-in area 11, an inner track 14 and an outer track 15 are formed outside the inner track 14.
When the predetermined straight line in the radial direction of the optical disc D is used as the reference straight line 16, the inner track 14 includes an arc track 14A surrounded by the reference straight line 16 and a straight line 17 forming 5 °, and other arc tracks 14B. It consists of.
The outer peripheral track 15 includes an arc track 15A surrounded by a reference straight line 16 and a straight line 17 forming 5 °, and other arc tracks 15B.

Next, the operation of the optical disc recording / reproducing apparatus that detects the position using the reference mark M when the fingerprint 18 is formed on the optical disc D after recording data is recorded on the optical disc D will be described.
It is assumed that the amount of reflected laser light reflected by the fingerprint 18 is 20% lower than the data area 12 where information is recorded. Further, as shown in FIG. 3, the amount of light reflected by the laser light decreases in proportion to the recording power.
Then, it is assumed that a fingerprint 18 is formed on the optical disc D after the recording signal is output from the signal recording circuit 4 to the optical pickup 2 and the signal is recorded on the optical disc D.

  While the focus signal and tracking signal are output from the servo signal processing unit 3 to the optical pickup 2 and the focus and tracking control of the optical pickup 2 is performed, the recording signal is output from the signal recording circuit 4 and the recording power is output from the optical pickup 2. The controlled laser beam is emitted, and marks M, N, O, and P are recorded on the tracks 14 and 15 in the lead-in area 11.

Here, when the recording power for recording information in the data area 12 is the reference recording power, the recording power for recording the reference mark M on the arc track 15A and the recording power for recording the mark P on the arc track 14B are the reference power. The recording power is 110% of the recording power, and the recording power for recording the marks N and O on the arc track 15B and the arc track 14A is 90% of the reference recording power.
Therefore, the reflected light amounts of the marks M, N, O, and P are as follows: the arc track 14B and the arc track 15A> the data area 12, the lead-in area 11, the lead-out 13, the outer peripheral zone Q> the arc track 14A and the arc track 15B. Have a relationship.
The radial widths of the marks M, N, O, and P formed on the arc tracks 14A, 14B, 15A, and 15B are 0.5 mm across a plurality of tracks.
By doing so, the visibility of the reference mark M and the other marks N, O, and P can be increased.

  In FIG. 2, the marks P and M formed on the arc track 14B and the arc track 15A are formed on the arc track 14B and the arc track 15A in order to show that the reflectance is higher than that of the arc tracks 14A and 15B. The solid lines of the marks P and M made thicker than the arc track 14A and the arc track 15B.

Next, the reference mark M is detected by the reference mark detection circuit 6.
Next, laser light is emitted from the optical pickup 2, and the stain inspection unit 7 detects the fingerprint 18 whose reflected light amount is 20% lower than the reflected light amount in the data area 12, and outputs an error flag from the signal reproduction circuit 5.
Further, the contamination inspection unit 7 detects the fingerprint 18 from the angle θ from the reference straight line 16 and the distance r from the center of the optical disc D to the fingerprint 18 by the error flag output from the signal reproduction circuit 5 when correction by ECC is impossible. The position of is calculated and output.

Next, the notification unit 8 displays that an error occurs together with the angle θ from the reference straight line 16 output from the contamination inspection unit 7 and the distance r from the center of the optical disc D to the fingerprint 18.
Specifically, the message “Fingerprint 18 at distance r and angle θ causes an error” is displayed. The fingerprint 18 is wiped off by this display.
When the amount of reflected light is within 10% of the amount of reflected light in the data area 12, the message “There is a fingerprint of distance r and angle θ” is displayed. In this case, the fingerprint 18 is left as it is without being wiped off.

  As described above, according to the embodiment of the present invention, the signal reproduction circuit 5 that outputs an error flag when correction by ECC is impossible, and the reference mark M formed in the lead-in area 11 of the optical disc D are provided. The reference mark detection unit 6 to detect and the fingerprint 18 on the surface of the optical disc D are detected, and based on the error flag output from the signal reproduction circuit 5, the angle θ from the reference straight line 16 passing through the reference mark M and the center of the optical disc D The stain inspection unit 7 that calculates the distance r from the fingerprint 18 to output the information indicating the position of the fingerprint 18, and the distance r and the angle θ indicating the position of the fingerprint 18 based on the information output from the stain inspection unit 7. And a notifying unit 8 for displaying whether or not the fingerprint 18 formed in the data area 12 causes an error. When the signal recorded in the area 12 is not deteriorated, it can be reproduced as it is without wiping off the dirt, so that deterioration due to wiping can be reduced.

Next, the operation of the optical disc recording / reproducing apparatus when the fingerprint 18 is formed in the outer peripheral zone Q instead of being formed in the data area 12 will be described with reference to FIG.
As shown in FIG. 4, the focus signal and tracking signal are output from the servo signal processing unit 3 to the optical pickup 2 as described above, and recording is performed from the signal recording circuit 4 while performing focus and tracking control of the optical pickup 2. A signal is output to emit a laser beam with a controlled recording power from the optical pickup 2, and a concentric visual mark 19 that is visible in the outer peripheral zone Q adjacent to the lead-out area 13 is formed.

Here, the visual mark 19 can be formed to be visible as follows. The visual mark 19 includes three marks 19A, 19B, and 19C that are sequentially formed from the inner peripheral side to the outer peripheral side.
The mark 19 </ b> A is formed 1 mm outside the lead-out area 13 with 90% of the reference recording power and a radial width of 1 mm along the lead-out area 13.
The mark 19B is formed on the outside adjacent to the mark 19A with a radial width of 1 mm along the mark 19A at 110% of the reference recording power.
The mark 19C is formed on the outside adjacent to the mark 19B with a radial width of 1 mm along the mark 19B at 90% of the reference recording power.
By doing so, the mark 19B can have a lower reflectance than the marks 19A and 19C, so that it becomes easier to see.
The relationship of the reference recording power for forming the marks 19A and 19C and the mark 19B may be reversed.

As described above, since the signal recording circuit 4 for forming the concentric visual mark 19 is formed in the outer peripheral zone Q adjacent to the lead-out area 13, the outer peripheral zone Q is located outside the visual mark 19. If there is dirt on the surface, the dirt can be prevented from being wiped off.
Therefore, it is possible to prevent the area from the lead-in area 11 to the lead-out area 13 from being soiled by wiping off the dirt.

In the embodiment of the present invention, the case of the optical disk recording / reproducing apparatus has been described. However, when the optical disk is dedicated for reproducing, the signal recording circuit 4 is not required as shown in FIG. In this case, an optical disc D in which marks M, N, O, and P are recorded in advance on the surface on the reference mark M and the arc tracks 14A, 14B, 15A, and 15B is used. In the above description, the arc track 15A is used as the reference mark M, but a mark recorded on another arc track may be used.
Moreover, although the radial width of the reference mark M is 0.5 mm, it may be 0.1 mm to 2 mm. The marks M, N, O, and P are recorded on the inner track 14 and the outer track 15 in the lead-in area 12, but they may be formed in the lead-out area 13 or the outer zone Q area of the lead-out. By doing so, visibility is increased for the user, and convenience is increased.

In this case, the recording power to the arc track 15A and the inner track 14B may be 130% of the reference recording power, and the recording power to the arc track 15B and the inner track 15A may be 70% of the reference recording power. Further, the reflectance relationship of marks recorded on the inner track 14 and the outer track 15 may be reversed.
The above can be applied even when the track is spiral, and can also be applied to the case of a recordable disc, a master disc for a read-only disc, and a replica disc of this master disc.

1 is a block diagram showing an optical disc recording / reproducing apparatus according to an embodiment of the present invention. It is a top view which shows an optical disk when a data area has dirt. It is a figure which shows the recording power dependence of a reflectance. It is a top view which shows the optical disk in case an outer periphery zone has dirt. It is a block diagram which shows the optical disk reproducing | regenerating apparatus of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk recording / reproducing apparatus, 2 ... Optical pick-up, 3 ... Servo signal processing part, 4 ... Signal recording circuit, 5 ... Signal reproduction circuit, 6 ... Reference mark detection part, 7 ... Contamination inspection part, 8 ... Notification part, 9 Control unit, 10 ... Center hole, 11 ... Lead-in area, 12 ... Data area, 13 ... Lead-out area, 14 ... Inner track, 14A, 14B, 15A, 15B ... Arc track, 15 ... Outer track, 16 ... Reference straight line, 17 ... straight line, 18 ... fingerprint, 19 ... visual mark, D ... optical disc, M ... reference mark, N, O, P ... mark, Q ... outer peripheral zone

Claims (5)

In an optical disc playback apparatus that performs playback by irradiating an optical disc with laser light,
A signal reproduction circuit that outputs reproduction data from a signal read from the optical disc and outputs an error flag when the data cannot be corrected by ECC (Error Correction Code) for correcting a data error;
A reference mark detector for detecting a reference mark formed in an area other than the data area of the optical disc in advance;
Based on the error flag output from the signal reproduction circuit, the surface of the optical disk is detected, and the angle from the reference straight line passing through the reference mark and the position where the contamination is generated from the center of the optical disk are detected. A stain inspection unit that outputs information indicating the position of the stain according to a distance;
A notification unit that displays the distance and the angle indicating the position of the dirt according to the information output from the stain inspection unit, and displays whether the dirt causes an error in the reproduction data;
An optical disc reproducing apparatus comprising: In an optical disc recording / reproducing apparatus for performing recording or reproduction by irradiating an optical disc with laser light,
A signal reproduction circuit that outputs reproduction data from a signal read from the optical disc and outputs an error flag when the data cannot be corrected by ECC (Error Correction Code) for correcting a data error;
A signal recording circuit for recording a reference mark in an area other than the data area of the optical disc;
A reference mark detector for detecting the reference mark;
Based on the error flag output from the signal reproduction circuit, the surface of the optical disk is detected, and the angle from the reference straight line passing through the reference mark and the position where the contamination is generated from the center of the optical disk are detected. A stain inspection unit that outputs information indicating the position of the stain according to a distance;
A notification unit that displays the distance and the angle indicating the position of the dirt according to the information output from the stain inspection unit, and displays whether the dirt causes an error in the reproduction data;
An optical disc recording / reproducing apparatus comprising: In the optical disc, the reference mark is recorded on an arc that is part of the first track in an area other than the data area, and the first mark is recorded on an arc that is not part of the first track. A second mark is recorded on a second track corresponding to a part of the first track on the inner or outer periphery side of the first track, and a part of the first track is recorded. A third mark is formed on the second track corresponding to other than
2. The optical disk reproducing apparatus according to claim 1, wherein reflectances of the reference mark and the third mark are higher than those of the first and second marks. The signal recording circuit records the reference mark on a partial arc of the first track in an area other than the data area of the optical disc, and on an arc other than the part of the first track, A first mark is recorded, and a second mark is recorded on a second track corresponding to a part of the first track on an inner circumference side or an outer circumference side of the first track. A third mark is recorded on the second track corresponding to a portion other than a part of the track,
3. The optical disc recording / reproducing apparatus according to claim 2, wherein reflectances of the reference mark and the third mark are higher than those of the first and second marks.   3. The optical disc recording / reproducing apparatus according to claim 2, wherein the signal recording circuit forms a visual mark outside a lead-out area of the optical disc.

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