JP3608738B2 - Transducer adjustment device and transducer adjustment method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an adjustment device for a transducer (pickup) in an apparatus that records and reproduces information on various disks such as MD (Mini Disc) and PC (Phase Change type disk), and more specifically. Further, the present invention relates to an improvement of a transducer adjustment device and an adjustment method suitable for the tracking and focus adjustment.
[0002]
[Prior art]
For example, in an MD player, information is compressed and expanded in a predetermined block time unit, and recorded or reproduced on a disk whose rotation is controlled at CLV (constant linear velocity). That is, at the time of recording, bibliographic information, audio information, etc. are recorded in a predetermined format at a constant linear velocity on a plurality of tracks spirally engraved from the inner periphery to the outer periphery on the disk by the magnetic head and transducer. At the time of reproduction, information recorded on the disk is read by the transducer. In these cases, tracking, which is tracking of the laser beam with respect to the track, and focus control of the laser beam are performed. Further, the rotational speed control and address detection of the disk are performed based on the wobbling signal obtained from the wobbling of the track.
[0003]
FIG. 2 shows a block diagram of the MD player. In the figure, input / output of a digital signal is directly performed to an EN (encoder) / D (decoder) & servo circuit 10 on the medium side. However, input / output of an analog audio signal is performed via an ADC (analog / digital converter) / DAC (digital / analog converter) 12. Further, the microphone input is performed via the microphone amplifier 14, and the headphone output is performed via the headphone amplifier 16.
[0004]
An EN / D & memory controller 18 on the input / output side is connected to the media side EN / D & servo circuit 60, and a shock proof memory 20 is connected to this. Encoding / decoding processing such as EFM, A-CIRC (Advanced-Cross Interleaved Reed-Solomon Code) is performed in the media side EN / D, and ATRAC (Adaptive Transform Acoustic Coding) is performed in the input / output side EN / D. Encoding and decoding processes are performed.
[0005]
Signal recording and reproduction with respect to the disk 22 is performed by a magnetic head 24 (only during recording) and a transducer (displayed by PU) 26 such as an optical pickup. The disk 22 is rotationally driven by a spindle motor 28, and the recording head 24 and the transducer 26 are feed-driven by a feed motor 30. The transducer 26, spindle motor 28, and feed motor 30 are driven by a motor driver 32.
[0006]
Next, the transducer 26 is connected to the head amplifier 34, and the output side of the head amplifier 34 is connected to the preamplifier 50. The media side EN / D & servo circuit 60 is also connected to the motor driver 32, the preamplifier 50, the magnetic head driver 38, and the system controller 70, respectively. The input / output side EN / D & memory controller 18 and the preamplifier 50 are connected to the system controller 70. The system controller 70 is also connected to a high frequency superimposing device 42, an LCD display unit 44, and a key input unit 46.
[0007]
Here, the basic operation of the apparatus configured as described above will be described. First, from the time of recording, the audio signal supplied from the outside is converted into a digital signal by the ADC / DAC 12 in the case of an analog signal, and then supplied to the media side EN / D & servo circuit 60 and further to the input / output side EN. / D & The memory controller 18 performs information compression processing by ATRAC. Then, after timing control by the shock proof memory 20, the media side EN / D & servo circuit 60 performs EFM and CIRC processing for recording and supplies them to the magnetic head driver 38.
[0008]
On the other hand, the spindle motor 28 is activated by the system controller 70. Further, the magnetic head 24 and the transducer 26 are set in a loop of the magnetic head 24 and the transducer 26 → the head amplifier 34 → the preamplifier 50 → the media side EN / D & servo circuit 60 → the motor driver 32 → the feed motor 30 → the magnetic head 24 and the transducer 26. Servo control is performed so that the position is reached.
[0009]
That is, an error signal for controlling focus and tracking is detected from the transducer output. The focus error signal and tracking error signal are fed back to the transducer 26 to control focus and tracking.
[0010]
Further, by using the ADIP signal based on the track wobbling obtained by this loop, the CLV rotation control of the disk 22 by the PLL is performed by the circuit of the media side EN / D & servo circuit 60-> motor driver 32-> spindle motor 28. .
[0011]
First, the transducer 26 moves to TOC (Table Of Contents) and UTOC (User Table Of Contents) near the innermost circumference of the disk 22, and necessary ID information is read out. It is displayed. Then, the operation shifts to a writing operation based on a key operation for instructing information writing in the key input unit 46. When the magnetic head 24 and the transducer 26 reach a predetermined position on the track on the disk 22, a signal to be recorded is supplied from the magnetic head driver 38 to the magnetic head 24, and information is magneto-optically recorded.
[0012]
Next, when reproducing, when the transducer 26 reaches a predetermined track position by the feed motor 30, a laser beam on which a high-frequency signal is superimposed by the high-frequency superimposing device 42 is output from the transducer 26, and this is reflected by the disk 22 to be a signal. Is obtained. These RF signals and servo signals are amplified by the head amplifier 34 and output to the preamplifier 50.
[0013]
The media side EN / D & servo circuit 60 decodes the RF signal, while the error signal for controlling the focus and tracking of the transducer 26 and the ADIP signal from the wobbling track are sent from the preamplifier 50 to the media side. The signal is supplied to the EN / D & servo circuit 60, and focus and tracking control or rotation control of the spindle motor 28 is performed.
[0014]
The decoded signal is further subjected to error correction and the like, and is supplied to the input / output side EN / D & memory controller 18 where timing control and data expansion are performed by the shock proof memory 20 to obtain a digital audio signal. It is done. This signal is output as it is, or supplied to the ADC / DAC 12 to be converted into an analog audio signal and output.
[0015]
Each block shown in FIG. 2 is an example of an MD player, but can be commonly applied to a CLV type device, and is divided into CD, MD-data, and the like depending on the subsequent processing method of the obtained signal. .
[0016]
By the way, when recording and reproducing information on various discs with different light reflectivities, the laser beam power output from the transducer can be varied in multiple stages, and tracking and focus control can be stabilized. Need to be done. For example, at the time of recording, the laser power is varied in a plurality of stages in accordance with disc variations. During reproduction, the laser power is varied in a plurality of stages according to the reflectivity of different types of disks (such as pre-mastered and MO (magneto-optical disk)).
[0017]
Corresponding to these, in order to make the reproduction light of the transducer appropriate, it is necessary to adjust tracking and focus each time the laser power is switched. Specifically, it is necessary to adjust the offset and balance of these error signals to make them appropriate. In particular, in consideration of compatibility with other sets in the recording or reproducing apparatus, it is necessary to accurately adjust the offset and balance of the tracking error signal and focus error signal of the transducer.
[0018]
In this case, even if the transducer is positioned at the center of the error signal based on the error signal such as the tracking error signal or the focus error signal, the best point of the actual signal quality is not necessarily due to the optical effect of the detection element. Don't be. For this reason, the error center is offset to the maximum amplitude point of the read EFM (Eight to Four Modulation) signal, or offset to the minimum jitter point of the read EFM signal (for example, Japanese Patent Publication No. 5-42060). No. publication).
[0019]
FIG. 3 shows this state, and the maximum point PA of the EFM output indicated by the graph GA is on the minus side from the center “0” of the focus error signal in the example of FIG. Further, the minimum point PB of the EFM jitter indicated by the graph GB is further on the negative side. The minimum point PC of the ADIP signal jitter shown by the graph GC is also different from them.
[0020]
A conventional adjustment method using this EFM signal will be described. The transducer 26 is moved to the TOC area of the disk 22, and ID information such as whether the disk is ROM or RAM, or a hybrid in which they are mixed is read. In the case of ROM, adjustment is performed in the TOC area, and in the case of RAM or hybrid, adjustment is performed in the ROM area such as the TOC area and the RAM area such as the UTOC area. Adjustment is performed manually, and an EFM signal is obtained by using the information recording portion of the disk 22, and the focus offset amount or balance adjustment is performed so that the level of the EFM signal is maximized or the jitter is minimized. Adjust the volume.
[0021]
[Problems to be solved by the invention]
However, the conventional technique for positioning and adjusting the transducer at the maximum EFM signal point or the minimum jitter point as described above is possible when an EFM signal can be detected, that is, when an information signal is recorded. Thus, there is a disadvantage that the adjustment method cannot be applied to an area where no EFM signal is recorded.
Even if a signal is recorded on the disc, if the recording time is short, the EFM signal disappears during the adjustment, and an error occurs in the adjustment.
[0022]
The present invention pays attention to these points, and even when information is not recorded or when the recording time is short, the transducer can be positioned and adjusted to achieve the best signal quality, and can be applied to various disks. It is an object of the present invention to provide a transducer adjustment device and an adjustment method.
[0023]
[Means for Solving the Problems]
In order to achieve the object, the following 1) to 4 ).
That is,
[0024]
1) In a transducer adjustment device for adjusting the focus or tracking of a transducer for recording or reproducing information on a disc.
Disc determination means for determining whether or not the disc includes a read-only and recordable area;
A predetermined length is detected by detecting the length of the recording signal in the recordable area. that's all A data amount determination means for determining whether or not the recording signal is not longer than a predetermined length by the data amount determination means,
Predetermined length in recordable area that's all A signal recording means for recording the test signal is provided, and the recorded test signal is reproduced thereby to focus or track Adjustment Adjusting means to
A transducer adjustment device comprising:
2) In a transducer adjustment method for adjusting the focus or tracking of a transducer for recording or reproducing information on a disk,
A determination step of determining whether the disc is recordable;
Reading the management area of the recordable disc;
Determining whether there is a recorded signal of a predetermined length or more from the management area;
A reproduction step of reproducing the recorded signal when there is the recorded signal;
Adjusting focus or tracking based on measurement of a signal reproduced from the recorded signal;
A transducer adjustment method comprising:
3) In a transducer adjustment method for adjusting the focus or tracking of a transducer for recording or reproducing information on a disk,
A determination step of determining whether the disc is recordable;
Reading the management area of the recordable disc;
Determining whether there is a recorded signal of a predetermined length or more from the management area;
A recording step of recording a test signal of a predetermined length or more on the recordable disc when there is no recorded signal;
A reproduction step of reproducing the recorded test signal;
Adjusting focus or tracking based on measurement of the regenerated test signal;
A transducer adjustment method comprising:
4) Transducer focus for recording or playing back information on a disc Or tracking In the transducer adjustment method for adjusting
Determining whether there is a recorded signal of a predetermined length or longer in the recordable area of the disc;
When there is no recorded signal longer than a predetermined length in the recordable area of the disc,
A recording step of recording a test signal of a predetermined length on the recordable disc;
A reproduction step of reproducing the recorded test signal;
Of the reproduced test signal Focus or tracking based on measurement Adjusting steps,
A transducer adjustment method comprising:
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a transducer adjusting device and an adjusting method according to the present invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol shall be used for the component similar to the prior art mentioned above, or the component corresponding to a prior art.
[0026]
<First embodiment>
FIG. 1 shows the configuration of the main part of this embodiment. In the figure, the RF signal output side of the transducer 26 is connected to the inverting and non-inverting input sides of the OP amplifier A1 of the preamplifier 50, respectively. The output side of the OP amplifier A1 is connected to the amplifier A2, and the output of the amplifier A2 is an EFM signal. The output side of the amplifier A2 is connected to the absolute value circuit 52, and the output side of the absolute value circuit 52 is connected to the LPF 54 having a cutoff frequency of 20 KHz. The LPF 54 outputs an envelope EFML of the EFM signal.
[0027]
Next, among the outputs A, B, C, and D of the quadrant diode (not shown) of the photosensor of the transducer 26, the output side of A and D is connected to the inverting input side of the OP amplifier A3 through the resistor R, respectively. The output sides of B and C are connected to the non-inverting input side via resistors R, respectively. As a result, the output of the OP amplifier A3 becomes (B + C)-(A + D). The output side of the OP amplifier A3 is connected to a BPF 56 having a cutoff frequency of 10 kHz and a high frequency side of 40 kHz. An ADIP signal is output from the BPF 56.
[0028]
Next, among the outputs A, B, C and D, the output sides of A and C are connected to the non-inverting input side of the OP amplifier A4 via resistors R and R1, and the output sides of B and D are It is connected to the inverting input side of the OP amplifier A4 via resistors R and R2. As a result, the output of the OP amplifier A4 becomes (A + C)-(B + D). The output side of the OP amplifier A4 is connected to the inverting input side of the OP amplifier A5 and the resistors R4 and R5 via the resistor R3. A focus excitation signal FK, which will be described later, is input to the resistor R5 via the capacitor C. The resistor R4 is connected to the output side of the OP amplifier A5.
[0029]
A focus error signal FE is output from the OP amplifier A5. The resistance value of the resistor R1 on the non-inverting input side of the OP amplifier A4 can be changed by the focus balance signal FBAL, and the focus offset signal FOFS is input to the non-inverting input side of the OP amplifier A5. .
[0030]
Next, outputs E and F of a diode (not shown) adjacent to the quadrant diode of the transducer 26 are respectively input to the non-inverting and inverting input sides of the OP amplifier A6 via resistors R6 and R7. The output side of the OP amplifier A6 is connected to the inverting input side of the OP amplifier A7 and the resistor R9 via the resistor R8. The resistor R9 is connected to the output side of the OP amplifier A7.
[0031]
The OP amplifier A7 outputs a tracking error signal TE. Further, the resistance value of the resistor R7 on the inverting input side of the OP amplifier A6 can be varied by the tracking balance signal TBAL, and the tracking offset signal TOFS is input to the non-inverting input side of the OP amplifier A7.
[0032]
Next, the EFM signal of the OP amplifier A2, the ADIP signal of the BPF 52, the focus error signal FE of the OP amplifier A5, and the tracking error signal TE of the OP amplifier A7 are all supplied to the media side EN / D & servo circuit 60. The envelope (low frequency component) EFML of the EFM signal of the LPF 54 is supplied after being A / D converted to the automatic adjustment unit 72 of the system controller 70, and the focus is applied to the capacitor C from the vibration unit 74 of the system controller 70. An oscillation signal FK is supplied. Further, a focus balance signal FBAL is output from the automatic adjustment unit 72 of the system controller 70.
[0033]
Further, the system controller 70 is provided with a disk determination unit 76 and a data amount determination unit 78, and the media side EN / D & servo circuit 60 is provided with a test pattern generator 62. The test pattern generator 62 will be described in the second embodiment. The media side EN / D & servo circuit 60 and the system controller 70 also have the functions of the conventional technology. Other components are the same as those in FIG.
[0034]
Next, the operation of the first embodiment configured as described above will be described with reference to the flowcharts of FIGS. When the apparatus is turned on, focus offset adjustment is performed first (FIG. 4, step S1). That is, the laser beam of the transducer 26 is applied to the disk 22, but since it is generally defocused in the servo-off state, there is no (A + C)-(B + D) signal output of the OP amplifier A4 of the preamplifier 50. It should be.
[0035]
However, in practice, a voltage different from the reference value may be output from the OP amplifier A5 due to a circuit offset, a stray light component, or the like. Therefore, the focus offset signal FOFS is adjusted so that the output of the OP amplifier A5 becomes the reference value.
[0036]
Next, the spindle motor 28 is started in this state (step S2). Then, the focus and tracking servos are turned on, and focus and tracking servo control is performed based on the error signals FE and TE (step S3). Based on the operation instruction of the system controller 70, the transducer 26 moves to the TOC area of the disk 22 (step S4).
[0037]
Then, the information in the TOC area is read, and a predetermined automatic adjustment operation, for example, initial setting of laser power and gain of each amplifier is performed. In the system controller 70, the disc determination unit 76 determines whether the disc is ROM, RAM, or hybrid from the information read from the TOC area (step S5).
[0038]
As a result, if it is a ROM disk, an automatic adjustment operation is performed in the TOC area (step S6). FIG. 5 shows this automatic adjustment operation, and the adjustment is performed by the focus balance FBAL. The transducer 26 is moved to the data recording area of the disk 22 (step S61). Signals A to F are output from the transducer 26. These are supplied to the preamplifier 50 after being amplified by the head amplifier 34. Then, (B + C)-(A + D) is output from the OP amplifier A3. Further, an ADIP signal is output from the BPF 52.
[0039]
The OP amplifier A4 outputs (A + C)-(B + D) as described above. On the other hand, the focus excitation signal FK is output from the excitation unit 74 of the system controller 70. Thereby, the OP amplifier A5 outputs a signal FE + FK on which the focus excitation signal FK is superimposed. This signal FE + FK is supplied to the media side EN / D & servo circuit 60, and the focus servo of the transducer 26 is performed based on this signal. Then, the focus coil (not shown) starts to vibrate in the focus direction (left-right direction in FIG. 3) with the period of the excitation signal FK (step S62). This excitation is performed within the range of the focus servo.
[0040]
When this vibration is performed, the focus position swings to the left and right in FIG. When the focus position changes in this way, the amplitude of the EFM signal decreases on the graph GA. The EFM signal is supplied to the absolute value circuit 52, and the envelope EFML is extracted by filtering by the LPF 54 (step S63).
[0041]
The envelope EFML of the EFM signal is A / D converted and taken into the automatic adjustment unit 72 of the system controller 70. Here, signal acquisition by A / D conversion is performed 256 times with one excitation, for example, in order to increase the measurement accuracy by reducing the influence of disk defects, surface deflection, eccentricity, recording signal differences, and the like. Sampling is performed (step S63), and vibration is performed, for example, 16 times (step S64).
[0042]
Here, the acquisition of the EFM signal envelope EFML is performed in synchronization with the excitation signal FK, measured separately from the left and right with respect to the center of the graph shown in FIG. , LL. In addition, since 256 samplings are performed by one excitation, 256/2 = 128 times for each of the left and right.
[0043]
The automatic adjustment unit 72 compares these measured values LR and LL, and determines whether or not the difference between them is within a predetermined range (step S65). As a result, when the difference between the measured values LR and LL is within a predetermined range, it is considered that the EFM signal is maximum and the focus balance is in an appropriate state, and thus the adjustment operation is terminated (step S66). . This state is a state where the maximum point PA of the EFM output of the graph GA substantially coincides with the focus error center “0”, as illustrated in FIG.
[0044]
However, when the difference between the measured values LR and LL is large, the value of the resistance R1 on the input side of the OP amplifier A4 is changed by one step by the automatic adjustment unit 72 (step S67). Specifically, the resistor R1 is adjusted by the balance signal FBAL so that the gain is increased when the input A + C of the OP amplifier A4 is small, and the gain is decreased when A + C is large. Then, the focus is again excited and the above-described operation is repeated (steps S62 to S67).
[0045]
By this adjustment, the maximum point PA of the EFM output of the graph GA comes closer to the focus error center “0”. By repeating this adjustment operation, the offset indicated by ΔF in FIG. 3 is applied as a result, and focus positioning adjustment is performed at the EFM maximum output point.
[0046]
Next, returning to FIG. 4, the case where the disk determination unit 76 of the system controller 70 determines that the disk is a RAM or hybrid disk from the TOC area information of the disk 22 (step S5) will be described. In this case, not only the ROM area but also the RAM area needs to be measured and adjusted.
[0047]
First, the transducer 26 is moved to the TOC area and the automatic adjustment operation shown in FIG. 5 is performed (step S7). Next, the transducer 26 is moved to the UTOC area (step S8), and the recorded data is searched here. The data amount determination unit 78 of the system controller 70 calculates the actual reproduction time of the data on the disc from the address of the recorded data. Since the automatic adjustment shown in FIG. 5 takes about 100 ms, for example, it is determined whether the time required for measurement, which includes the time for timing control as a margin, is longer than the calculated recording data time.
[0048]
As a result, when it is determined that the data recording time is longer than the required measurement time (or both are equal) (Y in step S9), the transducer 26 is moved to the RAM area (step S10), and FIG. The automatic adjustment operation shown in (1) is performed (step S11). However, when it is determined that the data recording time is shorter than the required measurement time (N in step S9), the RAM area is set using the value adjusted in the TOC area in step S7 (step S12). ). Steps S13 to S15 will be described later.
[0049]
The measured values obtained for the ROM and RAM areas by the adjustment operation as described above, that is, the value of the input-side resistance R1 of the OP amplifier A4 of the preamplifier 50 (or the focus balance signal FBAL corresponding thereto) are, for example, the system controller The value stored in the memory 70 (not shown) is supplied to the preamplifier 50 when the disk 22 is accessed.
[0050]
<Second embodiment>
Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, when it is determined in step S9 of the first embodiment that the data recording time is shorter than the required measurement time, the transducer 26 is first moved to the RAM free area of the disk 22 (step S13).
[0051]
Then, test pattern data is generated from the test pattern generator 62 of the media side EN / D & servo circuit 60, and this is written in the empty area (step S14). Of course, this test pattern data has a length necessary for automatic adjustment. The test pattern is accessed again to obtain an EFM signal, and the automatic adjustment shown in FIG. 5 is performed (step S15). Other operations are the same as those in the first embodiment. If the test pattern written on the disc is not recognized as recorded information, there will be no trouble in normal recording and reproduction.
[0052]
As described above, according to the embodiment of the present invention, there are the following effects.
(1) According to the first embodiment, when a signal is not recorded on the disc or when the recorded signal is not long enough for adjustment, it is obtained using the TOC area which is a ROM area. Since the focus balance value that maximizes the EFM signal is also applied to the RAM area to adjust the focus, the focus adjustment can be satisfactorily performed at the best point without being affected by the information writing state of the disc. Since it is not affected by the presence or absence of the disk, it can be applied to various disks.
[0053]
(2) According to the second embodiment, when no signal is recorded on the disc or when the recorded signal is not long enough for adjustment, a test signal is recorded in the RAM area. Is used to adjust the focus by obtaining the focus balance value that maximizes the EFM signal, so that the focus can be adjusted to the best point without being affected by the information writing state of the disc. Since it is not affected by the presence or absence, it can be applied to various disks.
(3) In any of the embodiments, since the focus is excited at the time of adjustment, the measured value can be obtained quickly in a short time.
[0054]
<Other embodiments>
In addition, this invention is not limited to the said Example at all, For example, the following are also included.
(1) In the above-described embodiment, the present invention is applied to focus adjustment, but can also be applied to tracking adjustment. In this case, the vibration signal may be applied to the inverting input side of the OP amplifier A7 of the preamplifier 50 in FIG.
(2) In the above embodiment, the focus is adjusted so that the EFM signal is maximized. However, the jitter of the EFM signal may be detected and adjusted so that the jitter of the EFM signal is minimized.
[0055]
(3) The focus can be adjusted by adjusting the gain of the servo system without performing the focus excitation. However, by performing the excitation, the adjustment can be performed quickly in a short time. .
(4) The circuit configurations shown in FIGS. 1 and 2 can be modified in various ways so as to achieve the same effect. Further, it may be performed in software using a microprocessor.
[0056]
【The invention's effect】
As described above, according to the transducer adjustment device of the present invention, the following effects can be obtained.
(1) Since the length of the signal recorded in the RAM area of the disc is determined and the focus or tracking is adjusted by using the EFM signal of the signal when the length is longer than a predetermined length, the recorded signal is Misalignment due to shortness is avoided.
[0057]
(2) The length of the signal recorded in the RAM area of the disc is determined. When the length is not longer than the predetermined length, an adjustment signal is recorded, and focus or tracking is performed using the EFM signal obtained from the adjustment signal. Because the positioning is adjusted, the transducer can be positioned and adjusted to provide the best signal quality even when information is not recorded on the disk or when the recording time is short. .
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a main part of an embodiment of a transducer adjustment device and an adjustment method according to the present invention.
FIG. 2 is a block diagram showing an example of the overall configuration of a disc player.
FIG. 3 is a graph showing a relationship between a focus error and various signals.
FIG. 4 is a flowchart showing main operations of the apparatus.
FIG. 5 is a flowchart showing an automatic adjustment operation in the above operation.
[Explanation of symbols]
12 ... ADC / DAC
14 ... Microphone amplifier
16. Headphone amplifier
18 ... Input / output side EN / D & memory controller
20 ... Shock-proof memory
22 Disc
24 ... Magnetic head
26 ... Transducer
28 ... Spindle motor
30 ... Feed motor
32 ... Motor driver
34 ... Head amp
38 ... Magnetic head driver
42 ... LCD display section
44 ... Key input section
50 ... Preamplifier
52. Absolute value circuit (envelope detection means)
54 ... LPF (envelope detection means)
56 ... BPF
60: Media side EN / D & servo circuit
62 ... Test pattern generator
70 ... System controller
72. Automatic adjustment unit (adjustment means)
74: Excitation unit (excitation means)
76: Disc determination unit (disc determination means)
78: Data amount determination unit (data amount determination means)

Claims (4)

In a transducer adjustment device for adjusting the focus or tracking of a transducer for recording or reproducing information on a disk,
Disc determination means for determining whether or not the disc includes a read-only and recordable area;
And determining the data amount determination means for determining whether a predetermined length or more by detecting the length of the recording signal of the recording area, when the recording signal by the data amount determination means is determined not to be a predetermined length or longer In addition,
A signal recording means for recording a test signal having a predetermined length or more in a recordable area, and an adjustment means for adjusting the focus or tracking by reproducing the recorded test signal;
A transducer adjustment device comprising: In a transducer adjustment method for adjusting the focus or tracking of a transducer for recording or reproducing information on a disk,
A determination step of determining whether the disc is recordable;
Reading the management area of the recordable disc;
Determining whether there is a recorded signal of a predetermined length or more from the management area;
A reproduction step of reproducing the recorded signal when there is the recorded signal;
Adjusting focus or tracking based on measurement of a signal reproduced from the recorded signal;
A transducer adjustment method comprising: In a transducer adjustment method for adjusting the focus or tracking of a transducer for recording or reproducing information on a disk,
A determination step of determining whether the disc is recordable;
Reading the management area of the recordable disc;
Determining whether there is a recorded signal of a predetermined length or more from the management area;
A recording step of recording a test signal of a predetermined length or more on the recordable disc when there is no recorded signal;
A reproduction step of reproducing the recorded test signal;
Adjusting focus or tracking based on measurement of the regenerated test signal;
A transducer adjustment method comprising: In a transducer adjustment method for adjusting the focus or tracking of a transducer for recording or reproducing information on a disk,
Determining whether there is a recorded signal of a predetermined length or longer in the recordable area of the disc;
When there is no recorded signal longer than a predetermined length in the recordable area of the disc,
A recording step of recording a test signal of a predetermined length on the recordable disc;
A reproduction step of reproducing the recorded test signal;
Adjusting focus or tracking based on measurement of the regenerated test signal;
A transducer adjustment method comprising:

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