JP2008234695A - Optical disk inspecting device and optical disk inspecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk inspecting device in which, even when one optical disk is measured a number of times, the same error place is displayed and a visually observed optical disk can be associated with the display for the error places, and to provide an optical disk inspecting method. <P>SOLUTION: A binary signal corresponding to data recorded on the recording surface of an optical disk is prepared from a signal based on reflected light from the recording surface of the optical disk, address data are decoded from the binary signal, and a rotation position of the optical disk is acquired as a rotation reference position when a particular address is decoded. An error detection signal is output when the peak value of a signal for inspection crosses a prescribed value, the rotation position of the optical disk is continuously detected, and when an error detection signal is input, the rotation position of the error place is acquired as a rotation angle from the rotation reference position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disc inspection apparatus and an optical disc inspection method for irradiating a recording surface of an optical disc with a laser beam from an optical pickup, and inspecting the optical disc with a signal based on reflected light from the recording surface of the optical disc. The present invention relates to an optical disc inspection apparatus and an optical disc inspection method for detecting an error location existing on a recording surface of an optical disc and displaying it on a screen based on a signal based on reflected light from the recording surface of the optical disc.

Conventionally, an optical pickup device irradiates a recording surface of an optical disc with a laser beam, creates an inspection signal based on reflected light from the recording surface of the optical disc, and processes the inspection signal to perform data processing. The equipment to do is well known. In this optical disc inspection apparatus, as introduced in, for example, Patent Document 1, when an error occurs in the inspection signal due to scratches or foreign matter on the surface of the optical disc, the rotation angle information of the place where the error occurred, Some of them have a function of detecting the radius position information and the error range (that is, the size of a scratch, a foreign object, etc.), processing the data, and displaying it as error information of the optical disc.
Japanese Patent Laid-Open No. 10-21548

  However, in the conventional optical disk inspection apparatus, even on the same optical disk, the screen display of the error location differs as shown in FIGS. 9A and 9B depending on the setting method of the optical disk, and a certain optical disk is re-inspected later. In this case, there is a problem that the same result as the previous inspection is not obtained.

  Further, it is unclear how the screen display of the error location on the inspected optical disc corresponds to the optical disc viewed, and there is a problem that even if there is a relationship between the design of the label surface and the error location of the optical disc, it cannot be found.

  The present invention has been made in view of such circumstances, and the screen display of the error location is the same no matter how many times the same optical disc is measured, and the optical disc viewed and the screen display of the error location are associated with each other. It is an object of the present invention to provide an optical disc inspection apparatus and an optical disc inspection method that can be used.

  The optical disc inspection apparatus according to claim 1 creates a binarized signal corresponding to data recorded on the recording surface of the optical disc from a rotation means for rotating the optical disc and a signal based on reflected light from the recording surface of the optical disc. Address data decoding means for decoding address data from the binarized signal, rotation reference position acquisition means for acquiring the rotation position of the optical disc as the rotation reference position when the address data decoding means decodes the specific address, and inspection signal An error determination means for outputting an error detection signal when the crest value of the signal crosses a predetermined value, and detecting the rotational position of the optical disc, and the error detection signal from the error determination means, The error location rotation position detection means to obtain as the rotation angle, and the radial position of the optical disc are detected, An error location radial position detection means for acquiring a radius position of an error location by an error detection signal from the error determination means; a rotation position of the error location detected by the error location rotation position detection means; and the error location radius position detection means. And error position information creating means for creating error position information of the optical disk for displaying on the display means for displaying the result of the inspection of the optical disk using either or both of the radial positions of the detected error locations. It is characterized by that.

  The optical disk inspection apparatus according to claim 2 includes predetermined rotational position detecting means for detecting that the rotational position of the rotation by the rotating means has become a predetermined rotational position, wherein the rotational reference position acquiring means is the predetermined rotational position detecting means. A means for detecting a rotation angle after detecting a predetermined rotation position, and a means for acquiring a rotation angle when the address data decoding means decodes the specific address. The error position rotation position detection means detects the predetermined rotation position. The rotation angle after the means detects the predetermined rotation position is detected, the rotation angle when the error determination means outputs the error detection signal is acquired, and the rotation reference position acquisition means acquires the acquired rotation angle It is a means for correcting by the rotation angle when the specific address is decoded.

  The optical disk inspection apparatus according to claim 3, wherein the rotation reference position acquisition means outputs a reference position signal when the address data decoding means decodes the specific address, and the error location rotation position detection means acquires the rotation reference position. The means for detecting the rotation angle from when the means outputs the reference position signal, and the means for acquiring the rotation angle when the error determination means outputs the error detection signal.

  5. The optical disk inspection apparatus according to claim 4, wherein the rotation reference position acquisition means acquires a rotation angle when an address near the specific address is decoded in addition to when the specific address is decoded, and the specific address is not decoded. Is a means for calculating the rotation angle when it is estimated that the specific address is decoded from the rotation angle acquired when the address near the specific address is decoded.

  The optical disk inspection apparatus according to claim 5 is based on the rotation reference position acquired by the rotation reference position acquisition means, the direction in which the optical pickup moves relative to the optical disk, and the position that is directly above when the rotation means is viewed. Rotation position setting means for setting a rotation position for stopping rotation and a rotation reference position of error position information displayed on the screen based on an angle in a rotation direction formed by a direction to the center position of the rotation means, and a rotation position setting means And a predetermined rotational position stopping means for stopping the rotation at the rotational position set by the error position information generating means for displaying the error position information on the display means at the rotational position set by the rotational position setting means. And

  The optical disk inspection apparatus according to claim 6 includes specific position rotation means for rotating the optical disk to a specific rotation position and detecting a rotation angle at the specific rotation position, and the error position information creating means includes at least the specific position rotation means. A screen rotation reference position setting unit that sets the rotation reference position of the error position information displayed on the display unit based on the detected rotation angle and the rotation reference position acquired by the rotation reference position acquisition unit is provided. To do.

  The optical disc inspection method according to claim 7 creates a binary signal corresponding to data recorded on the recording surface of the optical disc from a signal based on the reflected light from the recording surface of the optical disc while rotating the optical disc. When the address data is decoded from the digitized signal and the specific address is decoded, the rotation position of the optical disk is acquired as the rotation reference position, and when the crest value of the inspection signal crosses a predetermined value, an error detection signal is output. When the error detection signal is output, the rotation position of the error location is acquired as the rotation angle from the rotation reference position, the radius position of the optical disk is detected, and the error detection signal is output Obtains the radial position of the error location, and either or both of the rotation position of the detected error location and the detected radial location of the error location Used, characterized by creating error position information of the optical disk for displaying the results of the optical disc of the inspection.

  In the optical disk inspection method according to claim 8, the rotation angle at the rotation position of the error part is acquired after detecting that the rotation position of the rotation of the optical disk is a predetermined rotation position and detecting the predetermined rotation position. The rotation angle when the specific address is decoded is acquired, the rotation angle after detecting the predetermined rotation position is detected, and the rotation angle when the error detection signal is output is determined. The rotation angle acquired when the error detection signal is output is corrected by the rotation angle acquired when the specific address is decoded.

  In the optical disk inspection method according to claim 9, the rotation angle at the rotation position of the error location is obtained by outputting a reference position signal when the specific address is decoded and detecting a rotation angle from when the reference position signal is output. The rotation angle when the error detection signal is output is obtained.

  According to the first and seventh aspects of the present invention, the address data recorded on the optical disc is decoded, the specific address is decoded as the rotation reference position, and the rotation position of the error location is set as the rotation angle from the rotation reference position. Since the position of the specific address is always at the same position if it is the same disk, the error position information can be displayed on the display means the same no matter how many times it is measured.

  According to the invention of claim 2 and claim 8, in order to acquire the rotation position of the error location as the rotation angle from the rotation reference position, the rotation angle when the specific address is decoded is acquired, and the error is detected. The rotation angle is corrected by the rotation angle when the specific address is decoded. According to this, the rotation position of the error location can be obtained with high accuracy as the rotation angle from the rotation reference position.

  According to the third and ninth aspects of the invention, in order to obtain the rotation position of the error location as the rotation angle from the rotation reference position, the rotation angle is detected from when the specific address is decoded (every 360 ° is rotated). To 0 °). This also makes it possible to acquire the rotation position of the error location with high accuracy as the rotation angle from the rotation reference position.

  According to the invention of claim 4, when the specific address cannot be decoded, the rotation angle at the specific address is calculated from the rotation angle at the address near the specific address. Even when the specific address cannot be detected due to the influence of the vibration of the apparatus, the inspection does not stop, so that the work efficiency can be improved.

  According to the invention of claim 5, the rotation made by the rotation reference position, the relative movement direction of the optical pickup with respect to the optical disk, and the direction from the position directly above when the rotation means is viewed to the center position of the rotation means. Since the rotation position for stopping the rotation and the rotation reference position of the error position information displayed on the display means are set based on the angle in the direction, the rotation reference position of the optical disc as viewed and the error position information to be displayed are displayed. The rotation reference position can be matched, and the optical disk viewed can be associated with the optical disk whose error position is displayed on the display means.

  According to the sixth aspect of the invention, the rotation reference position of the error position information displayed on the display means is set based on the rotation angle and the rotation reference position at the rotation stop position after rotating the optical disk to the specific rotation position. Therefore, the error position information in the unified orientation of the label surface of the optical disk can be displayed on the display means.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. The optical disc inspection apparatus according to the embodiment of the present invention irradiates a recording surface of an optical disc with laser light from an optical pickup device, and inspects the optical disc with a signal based on reflected light from the recording surface of the optical disc.

  FIG. 1 is a block diagram showing an optical disc inspection apparatus according to the present invention. FIG. 2 is an explanatory diagram visually showing how the rotation data is corrected using the rotation position when the specific address is decoded as the rotation reference position. FIG. 3 is an explanatory diagram visually showing the stop position of the optical disc. FIG. 4 is an explanatory diagram visually showing a method of displaying the error position of the optical disc on the screen in accordance with the visually observed optical disc. FIG. 5 is a flowchart of a program for acquiring a rotation angle when a specific address executed by the optical disc inspection apparatus of the present invention is decoded and correcting rotation angle data (hereinafter referred to as rotation data). FIG. 6 is a flowchart of a program for acquiring rotation data using the rotation reference position when the specific address executed by the optical disk inspection apparatus of the present invention is decoded. FIG. 7 is a flowchart of a program for handling when a specific address executed by the optical disk inspection apparatus of the present invention is not decoded. FIG. 8 is a flowchart of a program for stopping the optical disc executed by the optical disc inspection apparatus of the present invention at a predetermined rotational position.

  In the figure, the optical disc inspection apparatus 1 of this embodiment irradiates a recording surface of an optical disc DK with laser light from an optical pickup device 201 in addition to a controller 502 having a display device 506 and an input device 504. HF signal amplification circuit 102, focus error signal generation circuit 104, focus servo circuit 106, drive circuits 108 and 124, and tracking error signal constituting a general optical disk inspection apparatus that inspects an optical disk DK with a signal based on reflected light from Generation circuit 120, tracking servo circuit 122, reproduction signal generation circuit 130, binary signal generation circuit 132, address decoding circuit 134, wobble signal extraction circuit 140, laser drive circuit 202, spindle motor 301, spindle motor control circuit 302, timer Down table 306, the rotation angle detecting circuit 312, a feed motor 400, and a feed motor control circuit 402, the radial position detection circuit 412 and the like. In addition to the configuration of a general optical disc inspection apparatus, a signal switching circuit 206, a clock signal generation circuit 208, an A / D converter 210, an error determination circuit 212, a data storage circuit (1) 214, a data storage circuit (2) 314, a data storage circuit (3) 414, and the like.

  When receiving an instruction from the controller 502, the clock signal generation circuit 208 outputs a pulse signal having a predetermined period. The A / D converter 2110 receives the clock signal from the clock signal generation circuit 208, samples the signal output from the signal switching circuit 206 at a predetermined interval, converts the peak value into digital data, and stores the data storage circuit (1 ) Output to 2l4. The signal switching circuit 206 selects at least one of a focus error signal, a tracking error signal, and a reproduction signal as a signal to be output to the A / D converter 210 according to an instruction from the controller 502.

  The error determination circuit 212 is composed of a comparator and a time measurement circuit. When the peak value of the signal from the signal switching circuit 206 crosses a predetermined level and crosses the predetermined level again, the next determination is made from the first cross to the next. When the time until the cross is longer than the predetermined time, a signal indicating error detection is output to the data storage circuit (1) 214, the data storage circuit (2) 314, and the data storage circuit (3) 414. The time from the first cross to the next cross is measured because there is noise in the signal.

  The data storage circuit (1) 214 has a memory area such as a RAM inside, and starts operation when an inspection start command is input from the controller 502, and stores the digital data from the A / D converter 210 in the memory area. When the number of stored digital data reaches a predetermined number (for example, 100,000), the data is stored again from the beginning. When the signal from the error determination circuit 212 is received, the storage of the digital data is stopped, and a flag for identifying the last stored data is put in an area after a predetermined number of areas from the last stored digital data area. Then, storage of digital data is started again in another area of the memory. When there is an instruction to fetch data from the controller 502, the digital data stored in the memory is output to the controller 502 and the operation is stopped. In this embodiment, the data storage circuit (1) 214 and the A / D converter 210 are combined into one, and the signal switching circuit 206 can select any of a focus error signal, a tracking error signal, and a reproduction signal as an inspection signal. However, the signal switching circuit 206 is eliminated, and the error determination circuit 212, the data storage circuit (1) 214, and the A / D converter 210 are provided in each of three focus error signals, tracking error signals, and reproduction signals. The data of at least one signal may be stored, and evaluation using a plurality of signals may be performed at once by a program process described later.

  The rotation angle detection circuit 312 receives the pulse signal from the encoder in the spindle motor 301, counts the number of pulses, calculates the rotation angle from the count number, and sends a signal corresponding to the rotation angle to the data storage circuit (2) 314. Output. Further, by outputting a signal corresponding to the rotation angle to the controller 504, the controller 502 can acquire the rotation angle θa when the address decoding circuit 134 decodes a specific address. When an index signal is input from the encoder, the count number is cleared to zero. That is, the rotation angle is 0 ° when the index signal is input. Regardless of the index signal, counting may be started from an arbitrary rotation position, and when the count number reaches a value corresponding to one rotation, the count number may be cleared to zero. In this case, the rotation position where the counting is started corresponds to the rotation position where the index signal is input.

  The data storage circuit (2) 314 has a memory area such as a RAM therein, and starts operation when an inspection start command is input from the controller 502. When the data storage circuit (2) 314 receives a signal from the error determination circuit 212, the data storage circuit (2) 314 Store the data. When there is an instruction to fetch data from the controller 502, the digital data stored in the memory area is output to the controller 502 and the operation is stopped. The radial position detection circuit 412 receives a pulse signal and an index signal from an encoder in the feed motor 400, counts the number of pulses, calculates the radial position from the counted number, and outputs a signal corresponding to the radial position. The data storage circuit (3) 414 has a memory area such as a RAM therein, and starts operation when an inspection start command is input from the controller 502 and receives a signal from the error determination circuit 212. Store the data. When there is an instruction to fetch data from the controller 502, the digital data stored in the memory area is output to the controller 502 and the operation is stopped.

  In the optical disc inspection apparatus 1 configured as described above, the operator sets the optical disc DK to be inspected on the turntable 306 and operates the apparatus. Then, as inspection conditions, an inspection signal, an inspection start radius position, an inspection end The radius position to be input is input from the input device 504, and the start of inspection is input. When the operator inputs an inspection start from the input device 504, the program of the flow shown in FIG. 5 starts, the optical disk DK rotates (S102), and the irradiation position of the laser light comes before the address specified in advance. Feeding is performed in the radial direction to the position (S104). Then, data reproduction is started by irradiating laser light as in a normal optical disk device (S106, S108), and when a specific address set in advance from the address decoding circuit 134 is input to the controller 502 (S110-YES) The rotation angle θa input from the rotation angle detection circuit 312 is taken in (S112).

  Next, it moves to the inspection radius position (S114, S116), and inspection of the error part of the optical disk is started (S118, S119). When the inspection is started, the error determination circuit 212 outputs a signal every time an error occurs in the inspection signal, whereby the peak value data D (n), the rotation data θ (n), and the radial position data r ( n) is stored in the data storage circuit (1) 214, the data storage circuit (2) 314, and the data storage circuit (3) 414 in the order of occurrence of errors. Then, when it reaches the radius position where the inspection is completed (S220-YES), the irradiation of laser light and the rotation of the optical disk DK are stopped by a stop command from the controller 502 (S222-S226), and data is received by a data fetch command from the controller 502. Crest value data D (n), rotation data θ (n), and radial position data r (n) are input to the controller 502 from the storage circuit (1) 214, data storage circuit (2) 314, and data storage circuit (3) 414. To do. Note that it is preferable to set the specific address so that the radius position of the specific address is the same as the inspection start radius position, because the movement to the inspection radius position is unnecessary and the work efficiency of the inspection can be increased.

  Next, the acquired rotation data θ (n) is corrected by the rotation angle θa when the specific address acquired previously is decoded (S130). Specifically, θ (n) ′ = θ (n) −θa is set as rotation data θ (n) ′. As a result, the rotation data at the error location can be data having the rotation reference position when the specific address is decoded. This correction will be described with reference to FIG. The encoder provided in the spindle motor 301 outputs an index signal when the spindle motor 301 rotates once, that is, when the turntable 306 or the optical disk DK rotates once. Then, the rotation data θ (n) at the error location is acquired as the rotation angle after the index signal is detected. This is because if the optical spot is fixed and the laser spot formed on the optical disc DK is rotated, there is a rotation position IND where an index signal is generated somewhere on the optical disk DK, and the laser spot has passed this rotation position IND. It can be considered that the rotation angle at the time when the laser spot passes through the error location is obtained as the rotation data θ (n) with the point as the rotation reference position (rotation angle 0 °).

  The rotation angle θa when the specific address ad is decoded is the time when the laser spot passes the recording position of the specific address ad, with the point where the laser spot has passed the rotation position IND as the rotation reference position (rotation angle 0 °). It can be considered that the rotation angle is acquired as the rotation angle θa. Therefore, as shown in FIG. 2, the value of θ (n) −θa is the rotation angle of the error location when the rotation position A when the specific address ad is decoded is set as the rotation reference position (rotation angle 0 °). .

  After correcting the rotation data θ (n), an error range L (n) is calculated (S132). Mimicry, the error range L (n) (error length) is obtained by multiplying T by the number m of peak value data larger than a predetermined level in the peak value data D (n) of the inspection signal. The counting of the number of data m and the calculation of the error range L (n) are performed for each peak value data D (n). Strictly speaking, the error range L (n) is (m−1) × T, but since the number of m is large, m−1 may be regarded as m. T is a unit of length given by (sampling interval t of peak value of inspection signal) × (set linear velocity s), and m × T is an error range expressed in length unit. It is. Note that T may be multiplied by (sampling interval t) × (linear velocity s) by (180 ° / r · π), and an error range L (n) calculated by m × T may be used as an angular unit. After the error range L (n) is calculated (S132), the error position on the optical disk is displayed on the screen of the display device 506 by the rotation data θ (n) ′, the radius data r (n), and the error range L (n). (S134). At this time, if the rotation reference position on the screen of the display device 506 is always set to the same position, the rotation reference position of the rotation data θ (n) ′ is always the rotation position when the specific address ad is decoded. If it is a disc, the same result can always be displayed on the screen.

  In the above method, the rotation position when the specific address ad is decoded is corrected to the rotation reference position (rotation angle 0 °) by correcting the rotation data θ (n). However, the rotation data θ (n) acquired without correction is used. ) May be data in which the rotation position when the specific address ad is decoded is the rotation reference position (rotation angle 0 °). FIG. 6 shows the flow of the program. In this method, the rotation angle detection circuit 312 starts the detection of the rotation angle after the signal indicating the rotation reference position is input from the controller 502, and the detected rotation angle. When the rotation angle reaches 360 °, the rotation angle is returned to 0 °, and the detection of the rotation angle is continued. The acquisition of the rotation angle θa in FIG. 5 (S112) is changed to the output of the rotation reference position signal (S212). The part (S130) which corrects (n) with the rotation angle θa when the specific address acquired previously is decoded is excluded.

  In addition, there is a slight possibility that the specific address ad is not correctly decoded due to the accuracy of the reproduction signal due to the influence of dust adhesion, contamination, vibration applied to the apparatus, impact, etc. on the surface of the optical disc DK. For this correspondence, the program flow shown in FIG. 7 is a program that calculates the rotation angle θa at the specific address ad from the addresses before and after the specific address ad when the specific address ad is not decoded. This program flow is a program in which the specific address detection (S110) portion of the program flow shown in FIG. 5 is changed. The same portions as those in FIG. 5 are denoted by the same reference numerals, and the changed portions are denoted by reference numerals such as S110-0. The program will be described below.

  First, after clearing the counter m (S110-1), every time an address is detected, it is determined whether it is a specific address ad (S110-2, 3), even if it is not a specific address ad (S110-3-NO), If it is determined that the address is within two before and after the specific address ad (S110-4-YES), the rotation angle θ (m) is fetched (S110-6). And when it determines with the specific address ad (S110-3-YES), the rotation angle (theta) a is taken in. In this case, the processing is the same as the program of FIG. If it is not determined to be the specific address ad (S110-3-NO), it is not the address within two before and after the specific address ad (S110-4-NO), and it is determined that the address is three or more after the specific address ad. If this is done (S110-5-YES), since the specific address ad has passed the recording position of the specific address ad without being decoded, in this case, the addresses within two before and after the specific address ad are decoded. The rotation angle θa at the specific address ad is calculated from the rotation angle θ (m) at that time (S110-8 to 27). As this method, there is a method of calculating from the address and the rotation angle, but the program flow shown in FIG. 7 is calculated only from the acquired rotation angle θ (m).

  When m is 3 (S110-8-YES), since the rotation angle θ (m) at the two addresses before and after the specific address ad is taken in, θ (1) and θ (2) An intermediate angle is set as a rotation angle θa (S110-9 to 14). Since there is a possibility that the rotational position IND is between θ (1) and θ (2), calculation when θ (2) −θ (1) is negative (S110-11) and θa is 360 °. Is calculated (S110-14). When m is 2 (S110-8-NO, S110-15-YES), when three of the rotation angles θ (m) at a total of four addresses, two before and after the specific address ad, are captured. Therefore, it is determined at which address the rotation angle could not be decoded (S110-16 to 23), and the following calculation is performed for each of the following cases (Table 1).

Case 1 (S110-21-YES, S110-22-YES):
The difference between the rotation angles at the previous addresses 1 and 2 is added to the rotation angle at the previous address 1 (S110-24).
Case 2 (S110-21-YES, S110-22-NO):
The intermediate rotation angle at the front address 1 and the rear address 1 is set to the rotation angle θa (S110-26, 12).
Case 3 (S110-21-NO, S110-23-YES):
The difference between the rotation angles at the rear addresses 1 and 2 is subtracted from the rotation angle at the rear address 1 (S110-25).
Case 4 (S110-21-NO, S110-23-NO):
The intermediate rotation angle at the front address 1 and the rear address 1 is set to the rotation angle θa (S110-27, 12).

  When m is 1 or less (S110-15-NO), this is a case where three of the five addresses in total, namely the specific address ad and the two before and after the specific address ad, could not be decoded. Since the possibility of occurrence is close to 0, it is assumed that the rotation angle θa is not obtained by calculation and the same process is performed again after returning to the radial position before the specific address (S110-28, 1). Thus, even if the specific address ad cannot be decoded, the rotation angle θa at the specific address ad can be calculated from the addresses before and after the specific address ad.

  The program flow in FIG. 7 is obtained by changing the specific address detection (S110) of the program flow in FIG. 5. Therefore, when the specific address ad is decoded by correcting the rotation data θ (n). This is applied to a method for setting the rotation position to the rotation reference position (rotation angle 0 °). If the following is performed, the rotation position when the specific address ad is decoded from the acquired rotation data θ (n). It can also be applied to a method in which data is set at a rotation reference position (rotation angle 0 °). Specifically, the rotation angle detection circuit 312 starts detection of the rotation angle after the index signal is input. When a signal indicating the rotation reference position is input from the controller 502, the rotation angle is set to 0 ° as the rotation angle. After that, regardless of the input of the index signal, when the detected rotation angle reaches 360 °, the detection returns to 0 ° and the detection of the rotation angle is continued. Then, the specific address detection (S210) of the program of FIG. 6 is changed to the program of FIG. 7, and the rotation reference position signal output (S212) is continuously taken in the rotation angle detection circuit 312 from the rotation angle detection circuit 312. When rotation is detected, a rotation reference position signal is output. Also by this method, the same effect as the previous method can be obtained.

  According to the above method, the same result can always be displayed on the screen for the same optical disc. However, the optical disc DK that has been visually observed and the optical disc displaying the error position displayed on the screen of the display device 506 are used. It cannot be associated. Therefore, if the position at which the optical disk DK is stopped is controlled, the visually observed optical disk DK can be associated with the error position display optical disk displayed on the screen. A position where the optical disk DK is stopped rotating will be described below.

  First, when the specific address ad is decoded, the position where the laser light applied to the optical disc DK is focused is the position where the specific address ad is recorded. That is, the position where the laser beam is condensed when the rotation angle reaches θa is the rotation reference position. In other words, the moving direction of the laser beam condensing position at the rotation angle θa (that is, the moving direction of the optical pickup) is the same as the rotation reference position. When the rotation angle detection circuit 312 detects the rotation angle with the rotation position when the specific address ad is decoded as the rotation reference position (rotation angle 0 °), θa is 0 °.

  As shown in FIG. 3, when the angle of the rotation direction formed by the viewing direction T with respect to the moving direction (moving direction of the optical pickup) P of the laser beam condensing position is θp, the specific address ad, that is, the rotation at the rotation angle θa + θp. The reference position is in the viewing direction T from the center of rotation. Therefore, when the rotation of the optical disk DK is stopped at the rotation angle θa + θp and the rotation reference position in the error position screen display is set to be directly above, the visually observed optical disk DK is associated with the error position display optical disk displayed on the screen. be able to.

  In order to stop the rotation of the optical disk DK at the rotation angle θa + θp, the program of the flow shown in FIG. 8 may be executed between the rotation stop (S126) in FIG. 5 and the fetching of various error information data (S128). This program issues a rotation stop command (S126), and after the spindle motor 301 stops rotating (S127-1), it starts rotating at an ultra-low speed rotation that stops with the rotation stop command (S127-2). ) When the rotation angle reaches θa + θp (S127-3 to 5), a rotation stop command is issued (S127-6). Note that the position at which the rotation of the optical disk DK is stopped is not limited to the rotation angle θa + θp, and the rotation angle θa + θp + α is set to an arbitrary position as long as the rotation reference position on the screen display of the error position is rotated by an angle α from directly above. Can be set to As a result, the visually observed optical disc DK can be associated with the optical disc displaying the error position displayed on the screen.

  As shown in FIG. 4, the screen display of the display device 506 displays error positions based on radius data r (n) and rotation data θ (n) indicated by solid lines. When it is desired to display the error position in a projected form, the direction of the rotation angle may be reversed as shown by the dotted line.

  According to the above method, it is possible to associate the visually observed optical disk DK with the optical disk displaying the error position displayed on the screen, but the design direction of the label surface of the optical disk with respect to the rotation reference position varies. The orientation of the label surface design on the optical disc DK as viewed is varied, and even if there is a relationship between the label surface design of the optical disc DK and the error position (the recording surface may be damaged by a device that prints on the label surface). Difficult to find).

  Therefore, the operator gives a rotation instruction from the input device 504, the spindle motor 301 rotates at an extremely low speed, and when the rotation stop instruction is given, the rotation is stopped so that the design of the label surface is in a predetermined direction and the rotation is performed. Based on the rotation angle and the rotation reference position at the stopped position, the rotation reference position of the optical disk whose error position is displayed on the screen is determined and displayed.

  Specifically, assuming that the rotation angle at the position where rotation has stopped is θs, α satisfying θs = θa + θp + α is calculated, and the optical disk displaying the error position on the screen with the rotation position directly above is rotated by an angle of α. What should I do? At this time, if θp is an accurate value, the visually observed optical disk DK can be associated with the optical disk displaying the error position on the screen, and the error position display can be performed by unifying the direction of the label surface design. it can. However, even if an arbitrary value is used for θp or α is calculated by excluding θp, the same error position can always be displayed on the screen of the display device 506 on the same optical disk, and the inspection is performed. It is possible to display the error position by unifying the direction of the label surface design in all optical disks.

  In the above method, the optical disk DK is rotated when the operator gives a rotation instruction and a rotation stop instruction from the input device 504. However, when the operator visually checks, the direction of the label surface design is completely unified. Therefore, instead of this, the optical disk DK is stopped by detecting one place on the label surface design of the optical disk DK with a sensor, and α satisfying θs = θa + θp + α is calculated by setting the rotation angle at the position where the rotation is stopped as θs. Then, the rotation reference position of the optical disk whose error position is displayed on the screen of the display device 506 may be displayed by being rotated by an angle α from directly above. According to this, the error position display can be performed by automatically unifying the design direction of the label surface in the optical disc DK.

  As described above, according to the optical disk inspection apparatus described above, the address data recorded on the optical disk DK is decoded, and the rotation position of the error location is rotated from the rotation reference position with the specific address being decoded as the rotation reference position. Since the position of the specific address is always at the same position if it is the same disk, the display on the display device 506 that is a display means of error position information is made the same no matter how many times it is measured. be able to.

  In addition, as a method of acquiring the rotation position of the error location as the rotation angle from the rotation reference position, the rotation angle when the specific address is decoded is acquired, and the rotation angle when the error is detected is the rotation when the specific address is decoded. By correcting with the angle, the rotation position of the error location can be obtained as the rotation angle from the rotation reference position with high accuracy.

  Furthermore, as a method of acquiring the rotation position of the error location as the rotation angle from the rotation reference position, the rotation angle is detected from when the specific address is decoded (returns to 0 ° every 360 ° rotation). The rotational position of the error location can be accurately acquired as the rotational angle from the rotational reference position.

  Further, when the specific address cannot be decoded, the rotation angle at the specific address is calculated from the rotation angle at the address in the vicinity of the specific address, so that the influence of dust contamination attached to the optical disk DK, vibration of the device, etc. Even if a specific address cannot be detected in this way, the inspection does not stop and work efficiency can be improved.

  Furthermore, the rotation is stopped based on the rotation reference position and the angle in the rotation direction formed by the moving direction of the optical pickup device 201 and the direction from the position directly above when viewing the rotation means to the center position of the rotation means. By setting the rotation position to be rotated and the rotation reference position of the error position information displayed on the display means, it is possible to match the rotation reference position of the optical disk DK that has been visually observed with the rotation reference position of the error position information to be displayed. Thus, the optical disk visually observed can be associated with the optical disk whose error position is displayed on the display device 506.

  Furthermore, by rotating the optical disk to a specific rotation position and setting the rotation reference position of the error position information displayed on the display device 506 on the basis of the rotation angle and the rotation reference position at the rotation stop position, Error position information in a unified orientation of the label surface of the optical disc DK can be displayed on the surface.

  As described above, according to the present invention, the screen display of the error part becomes the same no matter how many times the same optical disk is measured, and the optical disk inspection which can associate the visually observed optical disk with the screen display of the error part. An apparatus and an optical disk inspection method can be provided.

It is a block diagram which shows the optical disk test | inspection apparatus based on this invention. It is explanatory drawing which showed visually a mode that rotation data was correct | amended by making the rotation position at the time of decoding a specific address into a rotation reference position. It is explanatory drawing which showed the stop position of the optical disk visually. It is explanatory drawing which showed visually the method of displaying on the screen according to the optical disk which looked at the error position of an optical disk. It is a flowchart of the program which acquires the rotation angle when the specific address which the optical disk test | inspection apparatus of this invention performs is decoded, and correct | amends rotation angle data. It is a flowchart of the program which acquires rotation data on the rotation reference position when the specific address which the optical disk test | inspection apparatus of this invention performs is decoded. It is a flowchart of the program for a response | compatibility when the specific address which the optical disk test | inspection apparatus of this invention performs is not decoded. It is a flowchart of the program for stopping the optical disk which the optical disk test | inspection apparatus of this invention performs at a predetermined rotation position. It is explanatory drawing which shows that the screen display of an error position changes for every measurement in the test | inspection of the same disk in the conventional optical disk test | inspection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk inspection apparatus 102 ... HF signal amplification circuit 104 ... Focus error signal generation circuit 106 ... Focus servo circuit 108 ... Drive circuit 120 ... Tracking error signal generation circuit 122- ..Tracking servo circuit 124 ... Drive circuit 130 ... Reproduction signal generation circuit 132 ... Binary signal generation circuit 134 ... Address decode circuit 140 ... Wobble signal extraction circuit 201 ... Optical pickup Device 202 ... Laser drive circuit 206 ... Signal switching circuit 208 ... Clock signal generation circuit 210 ... A / D converter 212 ... Error determination circuit 214 ... Data storage circuit (1)
301 ... Spindle motor 302 ... Spindle motor control circuit 306 ... Turntable 312 ... Rotation angle detection circuit 314 ... Data storage circuit (2)
400 ... feed motor 402 ... feed motor control circuit 412 ... radial position detection circuit 414 ... data storage circuit (3)
502 ... Controller 504 ... Input device 506 ... Display device DK ... Optical disc

Claims (9)

Optical disc inspection in which an optical pickup irradiates a recording surface of an optical disc with an optical pickup, generates an inspection signal from a signal based on reflected light from the recording surface of the optical disc, and inspects the optical disc by inspecting the inspection signal In the device
Rotating means for rotating the optical disc;
Address data decoding means for creating a binary signal corresponding to the data recorded on the recording surface of the optical disk from a signal based on the reflected light from the recording surface of the optical disk, and decoding the address data from the binary signal When,
Rotation reference position acquisition means for acquiring the rotation position of the optical disc as a rotation reference position when the address data decoding means decodes the specific address;
An error determination means for outputting an error detection signal when the peak value of the inspection signal crosses a predetermined value;
An error location rotation position detection means for detecting the rotation position of the optical disc and acquiring the rotation location of the error location as a rotation angle from the rotation reference position by an error detection signal from the error determination means;
An error location radius position detection means for detecting a radius position of the optical disc and acquiring a radius position of an error location by an error detection signal from the error determination means;
The result of the inspection of the optical disk using either or both of the rotation position of the error location detected by the error location rotation position detection means and the radius location of the error location detected by the error location radius position detection means An optical disk inspection apparatus comprising: error position information creating means for creating error position information of the optical disk for displaying on the display means for displaying the error. A predetermined rotational position detecting means for detecting that the rotational position of the rotation by the rotating means has become a predetermined rotational position;
The rotation reference position acquisition unit detects a rotation angle after the predetermined rotation position detection unit detects a predetermined rotation position, and acquires a rotation angle when the address data decoding unit decodes the specific address. Means,
The error location rotation position detection means detects a rotation angle after the predetermined rotation position detection means detects a predetermined rotation position, and obtains a rotation angle when the error determination means outputs an error detection signal. 2. The optical disk inspection apparatus according to claim 1, wherein the optical disk inspection apparatus corrects the acquired rotation angle by a rotation angle when the specific address acquired by the rotation reference position acquisition means is decoded. The rotation reference position acquisition means is means for outputting a reference position signal when the address data decoding means decodes a specific address,
The error location rotation position detection means detects a rotation angle from when the rotation reference position acquisition means outputs a reference position signal, and acquires a rotation angle when the error determination means outputs an error detection signal. The optical disk inspection apparatus according to claim 1, wherein the optical disk inspection apparatus is a means. The rotation reference position acquisition means
When the address near the specific address is decoded in addition to decoding the specific address, the rotation angle is obtained,
When the specific address is not decoded, it is a means for calculating the rotation angle when the specific address is estimated to be decoded from the rotation angle obtained when the address near the specific address is decoded. The optical disk inspection apparatus according to claim 2, wherein: The rotation reference position acquired by the rotation reference position acquisition means, the direction in which the optical pickup moves relative to the optical disc, and the position directly above when the rotation means is viewed from the center position of the rotation means A rotation position setting means for setting a rotation position for stopping rotation and a rotation reference position of error position information to be displayed on the screen, based on the angle in the rotation direction formed by
Predetermined rotation position stop means for stopping rotation at the rotation position set by the rotation position setting means,
5. The optical disc inspection according to claim 1, wherein the error position information creating means displays error position information on the display means at the rotational position set by the rotational position setting means. apparatus. A specific position rotating means for rotating the optical disc to a specific rotation position and detecting a rotation angle at the specific rotation position;
The error position information creation means, based on at least the rotation angle detected by the specific position rotation means and the rotation reference position acquired by the rotation reference position acquisition means, the rotation reference of the error position information displayed on the display means 6. The optical disk inspection apparatus according to claim 1, further comprising a screen rotation reference position setting unit for setting a position. Optical disc inspection in which an optical pickup irradiates a recording surface of an optical disc with an optical pickup, generates an inspection signal from a signal based on reflected light from the recording surface of the optical disc, and inspects the optical disc by inspecting the inspection signal In the method
While rotating the optical disc,
Creating a binarized signal corresponding to the data recorded on the recording surface of the optical disc from the signal based on the reflected light from the recording surface of the optical disc, and decoding the address data from the binarized signal;
When the specific address is decoded, the rotation position of the optical disc is acquired as the rotation reference position,
When the peak value of the inspection signal crosses a predetermined value, an error detection signal is output,
Detecting the rotational position of the optical disc, and obtaining the rotational position of the error location as the rotational angle from the rotational reference position when the error detection signal is output;
In addition to detecting the radial position of the optical disc, when the error detection signal is output, acquire the radial position of the error location,
Using either or both of the rotational position of the detected error location and the radial position of the detected error location to create error location information of the optical disc for displaying the inspection result of the optical disc An optical disc inspection method. Obtaining the rotation angle at the rotational position of the error location is
Detect that the rotation position of the rotation of the optical disk has reached a predetermined rotation position,
While detecting the rotation angle after detecting the predetermined rotation position, obtaining the rotation angle when the specific address is decoded,
The rotation angle after detecting the predetermined rotation position is detected, the rotation angle when the error detection signal is output is acquired, and the rotation angle acquired when the error detection signal is output is 8. The optical disk inspection method according to claim 7, wherein the correction is made based on the rotation angle acquired when the specific address is decoded. Obtaining the rotation angle at the rotational position of the error location is
When a specific address is decoded, a reference position signal is output,
8. The optical disk inspection method according to claim 7, wherein the rotation angle from when the reference position signal is output is detected, and the rotation angle when the error detection signal is output is acquired.

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