JP2009015922A - Optical disk inspection device and optical disk inspection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk inspection device and an optical disk inspection method by which the same screen display of an error point is repeated whenever one and the same optical disk is measured and a visually viewed optical disk and the screen display of the error point can be associated with each other. <P>SOLUTION: An identification code recorded in the optical disk is irradiated with laser light and a specified position of the identification code detected from a signal based on reflected light from the optical disk is acquired as a rotation reference position. An error detection signal is outputted when the peak value of an inspection signal crosses a prescribed value to continue detection of a rotation position of the optical disk and when the error detection signal is inputted, the rotation position of the error point 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 device, 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 have a function of detecting the radius position information and the error range (that is, the size of a flaw, a foreign object, etc.), processing the data, and displaying the error information on the optical disc.
Japanese Patent Laid-Open No. 10-21548

  However, in the conventional optical disc inspection apparatus, even on the same optical disc, the screen display of the error location differs as shown in FIGS. 10A and 10B depending on how the optical disc is set, and a certain optical disc is re-inspected later. In this case, there is a problem that the same screen display as the previous inspection is not obtained.

  In addition, it is unclear how the screen display of the error location on the inspected optical disc corresponds to the optical disc viewed, and if there is an error location at a fixed rotational position, or the label surface design and error location on the recording surface There is a problem that it cannot be found even if it is related.

  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 disk inspection apparatus according to claim 1, wherein a rotating means for rotating the optical disk and a laser beam is irradiated to the identification code recorded on the optical disk, and the specific position of the identification code detected from the signal based on the reflected light from the optical disk is rotated. Rotation reference position acquisition means for acquiring as a reference position, error determination means for outputting an error detection signal when the peak value of the inspection signal crosses a predetermined value, and detecting the rotation position of the optical disc, and from the error determination means Error location rotation position detection means for acquiring the rotation location of the error location as a rotation angle from the rotation reference position by the error detection signal, and detecting the radius position of the optical disc, and the error location radius by the error detection signal from the error determination means The error location radius position detection means for acquiring the position and the error location rotation position detection means are used for detection. 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 rotational position of the error location and the radial position of the error location detected by the error location radial position detection means An error position information creating means for creating error position information is provided.

  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. This is a means to detect the rotation angle after detecting the predetermined rotation position, and to acquire the rotation angle when the specific position of the identification code is detected from the signal based on the reflected light from the optical disk, and to detect the error position rotation position The means detects the rotation angle after the predetermined rotation position detection means detects the predetermined rotation position, acquires the rotation angle when the error determination means outputs the error detection signal, and rotates the acquired rotation angle. The reference position acquisition unit is a unit that corrects by a rotation angle when a specific position of the identification code acquired is detected.

  The optical disk inspection apparatus according to claim 3 is a means for outputting a reference position signal when the rotation reference position acquisition means detects a specific position of the identification code from a signal based on reflected light from the optical disk, and detects an error location rotation position. The means is a means for detecting the rotation angle from when the rotation reference position acquisition means outputs the reference position signal, and for acquiring the rotation angle when the error determination means outputs the error detection signal. .

  The optical disk inspection apparatus according to claim 4 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 directly above the rotation means. Rotation position setting means for setting a rotation position for stopping rotation by the rotation means 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 rotation A predetermined rotation position stop means for stopping rotation by the rotation means at the rotation position set by the position setting means, and the error position information creation means creates error position information at the rotation position set by the rotation position setting means. It is characterized by that.

  The optical disk inspection apparatus according to claim 5 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 a rotation reference position of 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.

  7. An optical disc inspection apparatus according to claim 6, wherein the identification code recorded on the optical disc is irradiated with laser light, and identification code detecting means for acquiring information capable of calculating the total length of the identification code from a signal based on the reflected light from the optical disc. And the display means for displaying the result of the inspection of the optical disc based on the information that can calculate the total length of the identification code detected by the identification code detection means and the rotation reference position acquired by the rotation reference position acquisition means. And an identification code position information creating means for creating position information of the identification code.

  The optical disk inspection method according to claim 7, wherein the specific position of the identification code detected from the signal based on the reflected light from the optical disk is detected by rotating the optical disk while irradiating the identification code recorded on the optical disk with a laser beam. The error detection signal is output when the crest value of the inspection signal crosses the specified value, and the rotation position of the optical disk is detected. When the error detection signal is output, the rotation position of the error location is determined as the rotation reference. It is acquired as the rotation angle from the position, and the radial position of the optical disc is detected, and when the error detection signal is output, the radial position of the error location is acquired, and the rotation location of the detected error location and the detected error location are detected. Create optical disc error location information to display optical disc inspection results using either or both radial locations And wherein the Rukoto.

  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. And detecting the rotation angle when detecting the specific position of the identification code from the signal based on the reflected light from the optical disc, detecting the rotation angle after detecting the predetermined rotation position, The rotation angle when the error detection signal is output is acquired, and the acquired rotation angle is corrected by the rotation angle when the specific position of the identification code is detected.

  The optical disk inspection method according to claim 9, wherein the rotation angle at the rotation position of the error location is obtained by outputting a reference position signal when a specific position of the identification code is detected from a signal based on reflected light from the optical disk, and a reference position signal The rotation angle from when the error detection signal is output is detected, and the rotation angle when the error detection signal is output is acquired.

  According to the first and seventh aspects of the invention, the specific position of the identification code recorded on the optical disk is obtained as the rotation reference position, and the rotation position of the error location is obtained as the rotation angle from the rotation reference position. Since the specific position of the identification code is always at the same position in the same optical disc, the display on the error position information display means can be made the same no matter how many times the measurement is performed.

  According to the second and eighth aspects of the invention, when the specific position of the identification code is detected from the signal based on the reflected light from the optical disk in order to obtain the rotational position of the error location as the rotational angle from the rotational reference position. Since the rotation angle of the error location is acquired and the rotation angle when the error is detected is corrected with the rotation angle when the specific position of the identification code is detected, the rotation position of the error location is accurately rotated from the rotation reference position. It can be acquired as an angle.

  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 position of the identification code is detected (360 °). Therefore, the rotation position of the error location can be obtained as the rotation angle from the rotation reference position with high accuracy.

According to the invention of claim 4, the rotation made by the rotation reference position, the relative movement direction of the optical pickup with respect to the optical disc, 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. Rotation reference position can be adjusted
Without visually confirming the identification code, the visually observed optical disk can be associated with the optical disk whose error position is displayed on the display means.

  According to the invention of claim 5, the optical disk is rotated to a specific rotation position, and 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. Therefore, the error position information in the unified orientation of the label surface of the optical disk can be displayed on the display means.

  According to the invention of claim 6, since the position information of the identification code can be displayed together with the error position information of the optical disk on the display means, the correspondence between the visually observed optical disk and the display of the error position information on the display means is further improved. It can be done easily.

  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 disk inspection apparatus according to the present invention. FIG. 2 is an explanatory diagram visually showing how the rotation data is corrected with the position where the first bar of the identification code ends as the rotation reference position. FIG. 3 is an explanatory diagram visually showing the rotation 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 executed by the optical disk inspection apparatus of the present invention. FIG. 6 is a flowchart of another program executed by the optical disc inspection apparatus of the present invention. FIG. 7 is a flowchart of still another program executed by the optical disc inspection apparatus of the present invention. FIG. 8 is an explanatory diagram of an optical disc on which an identification code is recorded. FIG. 9 is an explanatory diagram in which the identification code is compared with the waveform of the reproduction signal of the identification code.

  In the figure, the optical disc inspection apparatus 1 of this embodiment irradiates a recording surface of an optical disc DK with a laser beam 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, wobble signal extraction circuit 140, laser drive circuit 202, spindle motor 301, spindle motor control circuit 302, turntable 306, rotation angle detection circuit 312, feed module Motor 400, feed motor control circuit 402, and a radial position detection circuit 412 and the like. In addition to the configuration of a general optical disc inspection apparatus, a binarized signal generation circuit 132, a BCA data read circuit 134, a BCA data decode circuit 136, a signal switching circuit 206, a clock signal generation circuit 208, and 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.

  As shown in FIG. 8, an optical disc DK such as a DVD or an HD DVD Blu-ray Disc has a barcode (hereinafter referred to as a BCA) as an identification code in a burst cutting area (BCA) at a predetermined radial position. A record) is formed. When the formed BCA record is shown in an enlarged manner, as shown in FIG. 9A, a plurality of barcode bars are arranged, and the intervals between the bars are different. There are usually four types of intervals between bars, and data encoded by the four types of intervals (data formed by a sequence of numbers corresponding to 1, 2, 3, 4; hereinafter referred to as BCA data) is formed. Has been.

  The reproduction signal generation circuit 130 generates and outputs a reproduction signal (FIG. 9B) from the amount of reflected light when the BCA recording is irradiated with laser light while rotating the optical disc DK. The binarized signal generation circuit 132 binarizes the reproduction signal from the reproduction signal generation circuit 130 into a high level and a low level as shown in FIG. 9C by a slice level set at a predetermined level. Create and output a signal. The BCA data read circuit 134 starts to operate in response to a command from the controller 502, creates BCA data as digital data from the binarized signal input from the binarized signal generation circuit 132, and outputs the BCA data to the BCA data decode circuit 136 and the controller 502. To stop the operation. The BCA data is data formed by a sequence of numbers corresponding to 1, 2, 3, and 4. The distance between the four types of bars, the width of the bars, and the semi-circular position of the BCA recording are determined by the standard. As described later, since the specific position of the BCA recording is determined as the rotation reference position, the controller 502 can display the BCA recording pattern on the display device 506 based on the BCA data. The BCA data decoding circuit 136 decodes the BCA data into data before encoding, and outputs the data to the controller 502.

  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. In addition, when the error detection level is set to the BCA detection level according to a command from the controller 502, the error determination circuit 212 outputs a detection signal to the controller 502 when the laser beam finishes passing through the BCA recording bar. . The controller 502 recognizes a detection signal when the laser beam finishes passing through the first bar of the BCA recording by program processing as will be described later, and takes in the rotation angle θa output by the rotation angle detection circuit 312 at the time of recognition. .

  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. Hereinafter, this digital data is referred to as peak value data D. 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 peak value data D 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 stores digital data corresponding to the rotation angle in the data storage circuit (2) 314. Output to. Further, by outputting a signal corresponding to the rotation angle to the controller 504, the controller 502 determines the rotation angle θa when the error determination circuit 212 outputs a detection signal at a specific position (position where the first bar ends) in BCA recording. It can be acquired. 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. Hereinafter, this digital data is referred to as rotation data θ. 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. Hereinafter, this digital data is referred to as radial position data r.

  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 beam is set to a radial position where BCA recording is present. The feed motor 400 is driven until it becomes (S104). Next, the signal output from the signal switching circuit 206 is set as a reproduction signal (S105), the error detection level of the error determination circuit 212 is set for detection of BCA recording (S106), and a laser is used like a normal optical disk apparatus. Light is irradiated and focus servo is started (S108, S110). In this state, a detection signal is input from the error determination circuit 212 every time the laser beam finishes passing the BCA recording bar, so that the next detection signal is input even if a predetermined time elapses after the detection signal is input. When not to be detected (S112 to S118). This is a process for detecting when the laser beam is applied to an area where BCA recording is not performed. In other words, it is a process for detecting when laser light is irradiated from the first bar of BCA recording. Then, the BCA data reading circuit 134 is activated at the time of detection (S120), and then when the detection signal is input from the error determination circuit 212 (that is, when the laser beam passes through the first bar of BCA recording). The rotation angle θa output from the rotation angle detection circuit 312 is fetched (S122, S124).

  When the laser beam has completely passed through the BCA recording bar, the BCA data is input from the BCA data reading circuit 134, so the focus servo is stopped (S126, S128), moved to the radius position where the inspection is started (S130), and the optical disk Inspection of the error location is started (S132 to S136). At this time, the signal output from the signal switching circuit 206 is set to the input inspection signal (S133), and the error detection level of the error determination circuit 212 is returned to the error detection level (S134). 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 at which the inspection is completed (S138-YES), the laser irradiation and the rotation of the optical disc DK are stopped by a stop command from the controller 502 (S140 to S144), 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.

  Next, the acquired rotation data θ (n) is corrected with the rotation angle θa of the specific position of the BCA recording acquired previously (S148). Specifically, θ (n) ′ = θ (n) −θa is set as rotation data θ (n) ′. Thus, the rotation data at the error location can be data with the specific position of BCA recording as the rotation reference position. 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 °).

  Further, the rotation angle θa at a specific position of BCA recording (position where the first bar ends) is set such that the point where the laser spot passes through the rotation position IND is the rotation reference position (rotation angle 0 °), and the laser spot is recorded in BCA recording. It can be considered that the rotation angle at the time of passing through the specific position 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 specific position A of BCA recording is set as the rotation reference position (rotation angle 0 °).

  After correcting the rotation data θ (n), an error range L (n) is calculated (S150). 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). (S152). 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 a specific position for BCA recording. The same result can be displayed on the screen. Further, if the BCA recording is visually observed, the visually observed optical disk can be associated with the screen display of the error location.

  In the above method, the specific position of the BCA recording is set 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 recorded in the BCA recording. It is also possible to use data in which the specific position 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 (S124) is changed to the output of the rotation reference position signal (S224), and the acquired rotation data θ The portion (S148) in which (n) is corrected by the rotation angle θa at the specific position of the BCA recording acquired earlier is excluded. Also by this method, the same effect as the program of the flow in FIG. 5 can be obtained.

  According to the above method, the same result can always be displayed on the screen for the same optical disc. However, if the BCA recording is not visually observed, the error position indication displayed on the screen of the optical disc DK and the display device 506 is displayed. Cannot be associated with other optical discs. Therefore, by controlling the position at which the rotation of the optical disk DK is stopped, it is possible to associate the optical disk DK viewed without viewing the BCA recording with the optical disk displaying the error position displayed on the screen. A position where the optical disk DK is stopped rotating will be described below.

  First, 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 specific position of BCA recording as the rotation reference position (rotation angle 0 °), θa is 0 °.

  As shown in FIG. 3, assuming that 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 condensing position of the laser beam is θp, the specific position of BCA recording at the rotation angle θa + θp. That is, the rotation reference position is in the viewing direction T from the center of rotation. Therefore, if the rotation of the optical disk DK is stopped at the rotation angle θa + θp and the rotation reference position in the screen display of the error position is set directly above, the optical disk DK viewed as it is corresponds to the optical disk of the error position display displayed on the screen. Can be attached.

  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. 7 may be executed between the rotation stop (S144) and the fetching of various error information data (S146) in FIG. This program issues a rotation stop command (S144), and after the spindle motor 301 stops rotating (S145-1), it starts rotating at an ultra-low speed rotation that stops rotation along with the rotation stop command (S145-2). ) When the rotation angle reaches θa + θp (S145-3 to 5), a rotation stop command is issued (S145-6). 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 Thereby, the optical disk DK viewed without viewing the BCA record can be associated with the optical disk displaying the error position displayed on the screen.

  The screen display of the display device 506 displays an error position based on radius data r (n) and rotation data θ (n) indicated by a solid line as shown in FIG. If the rotation reference position of the screen is constant, the visual optical disk can be associated with the displayed error position optical disk without including the BCA recording on the screen display, but the BCA recording is displayed on the screen display. If it is inserted, it is possible to make the association easier when visually confirming the BCA recording of the optical disk. When you want to display the error position in the form of a projected optical disk DK from the label surface, as shown by the dotted line, reverse the direction of the rotation angle, and then turn the BCA recording clockwise from the rotation reference position to the left Just turn around.

  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 without visually confirming the BCA recording of the optical disk DK. Since the design of the label surface varies, the orientation of the label surface design on the optical disc DK as seen is varied, and even if there is a relationship between the label surface design of the optical disc DK and the error position (print on the label surface). This may occur if the recording surface is scratched by the device to be used), and is difficult to find.

  Therefore, when the operator gives a rotation instruction from the input device 504, the spindle motor 301 rotates at an extremely low speed, and the rotation stop instruction is given by the operator's visual instruction, the rotation is stopped, and the design of the label surface is predetermined. Based on the rotation angle and the rotation reference position at the position where the rotation is stopped, the rotation reference position of the optical disk whose error position is displayed on the screen is determined and displayed. In addition, it may replace with an operator's visual observation and may instruct | indicate a rotation stop with a sensor.

  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 position directly above as the rotation reference position is rotated by an angle of α. What should I do? At this time, if θp is an accurate value, the optical disk DK viewed without viewing the BCA recording can be associated with the optical disk displaying the error position on the screen, and the label surface design direction is unified. Error position can be displayed. 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. Since α differs depending on the optical disc, the rotation reference position on the screen differs for each optical disc. Therefore, as shown in FIG. 4, the BCA record may be displayed on the screen simultaneously with the error part.

  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 with the rotation angle at the rotation stopped position being 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 specific position of the BCA recording recorded on the optical disk DK is used as the rotation reference position, and the rotation position of the error location is acquired as the rotation angle from the rotation reference position. Therefore, since the specific position of BCA recording is always at the same position on the same disk, the display on the display device 506 which is the display means of error position information can be made the same no matter how many times measurement is performed.

  Further, 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 position of BCA recording is detected is acquired, and the rotation angle when the error is detected is determined as the specific position of BCA recording. By correcting with the rotation angle at the time of detecting, the rotation position of the error location can be obtained as the rotation angle from the rotation reference position with high accuracy.

  Further, 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 the detection of the specific position of the BCA recording (returns to 0 ° every 360 ° rotation). However, the rotational position of the error location can be accurately acquired as the rotational angle from the rotational reference position.

  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. The visually observed optical disk and the optical disk whose error position is displayed on the display device 506 can be associated with each other without visually confirming the BCA recording.

  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.

  Further, since the position information of the BCA recording can be displayed together with the error position information of the optical disk on the display device 506 which is a display means, it is easier to associate the visually observed optical disk with the display on the error position information display means. It can be carried out.

  Various modifications can be made in the embodiment of the present invention. In the above embodiment, the position where the first bar of BCA recording ends is set as the rotation reference position. However, the error detection signal is output when the predetermined level is exceeded, and the start point of the first bar is set as the rotation reference position. It may be a position, or the number of error detection signals may be counted from the beginning, and the start or end position of a bar in the middle may be set as a rotation reference position by an error detection signal after detecting a predetermined number of counts. Rotation data θ is obtained every time an error detection signal is output, and the rotation data θ when the error detection signal is output when the error detection signal is not output for a predetermined time or longer after the error detection signal is output is adopted. The start point or end point of the last bar may be set as the rotation reference position.

  Furthermore, in the above embodiment, the BCA data is acquired in order to display the BCA record together with the error part on the screen. However, since it is sufficient that the entire length of the BCA record can be displayed on the screen, the last BCA record is used instead of the BCA data. You may make it acquire the rotation position of a bar.

  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 into a rotation reference position the position where the 1st bar | burr of an identification code ends. It is explanatory drawing which showed the rotation 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 the optical disk inspection apparatus of this invention performs. It is a flowchart of another program which the optical disk inspection apparatus of this invention performs. It is a flowchart of another program which the optical disc inspection device of the present invention performs. It is explanatory drawing of the optical disk with which the identification code was recorded. It is explanatory drawing which contrasted the identification code and the waveform of the reproduction signal of an identification code. 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 amplifier 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 ... BCA data read circuit 136 ... BCA data decode circuit 140 ... Wobble Signal extraction circuit 201... Optical pickup device 202... Laser driving circuit 206... Signal switching circuit 208... Clock signal generation circuit 210... A / D converter 212. ..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;
Rotation reference position acquisition means for irradiating the identification code recorded on the optical disc with laser light and acquiring a specific position of the identification code detected from a signal based on reflected light from the optical disc as a rotation reference position;
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 means detects a rotation angle after the predetermined rotation position detection means detects a predetermined rotation position, and detects a specific position of the identification code from a signal based on reflected light from the optical disk. It is a means to obtain the rotation angle when
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 position of the identification code acquired by the rotation reference position acquisition means is detected. The rotation reference position acquisition means is means for outputting a reference position signal when detecting a specific position of the identification code from a signal based on reflected light from the optical disc;
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 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 Rotation position setting means for setting a rotation position for stopping rotation by the rotation means and a rotation reference position of the error position information displayed on the screen based on an angle in a rotation direction formed by
Predetermined rotation position stop means for stopping rotation by the rotation means at the rotation position set by the rotation position setting means,
4. The optical disc inspection apparatus according to claim 1, wherein the error position information creating unit creates the error position information at the rotational position set by the rotational position setting unit. 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 5. The optical disk inspection apparatus according to claim 1, further comprising a screen rotation reference position setting unit that sets a position. An identification code detecting means for irradiating a laser beam on the identification code recorded on the optical disc and obtaining information capable of calculating the total length of the identification code from a signal based on the reflected light from the optical disc;
Based on information capable of calculating the total length of the identification code acquired by the identification code detection means and the rotation reference position acquired by the rotation reference position acquisition means, the result is displayed on a display means for displaying the inspection result of the optical disc. 6. An optical disc inspection apparatus according to claim 1, further comprising identification code position information creating means for creating position information of the identification code for the purpose. 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,
The identification code recorded on the optical disc is irradiated with laser light, and the specific position of the identification code detected from the signal based on the reflected light from 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
Detecting that the rotation position of the rotation of the optical disc has reached a predetermined rotation position;
Detecting the rotation angle after detecting the predetermined rotation position, and obtaining the rotation angle when the specific position of the identification code is detected from the signal based on the reflected light from the optical disc,
When detecting the rotation angle after detecting the predetermined rotation position, acquiring the rotation angle when the error detection signal is output, and detecting the specific position of the identification code based on the acquired rotation angle The optical disk inspection method according to claim 7, wherein the correction is performed by the rotation angle of the optical disk. Obtaining the rotation angle at the rotational position of the error location is
When a specific position of the identification code is detected from a signal based on reflected light from the optical disc, 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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