JPH07201059A - Adjusting device for transducer - Google Patents

Abstract

PURPOSE:To perform positioning adjustment of a transducer by which signal quality is made to be the best, even when information is not recorded or when a recording time is short. CONSTITUTION:In the case of ROM disk, oscillating focus with a oscillating section 74 is performed by an automatic adjusting section 72 of a system controller 70. And positioning adjustment of focus of a transducer 26 is automatically performed based on an envelope EFML of an EFM signal of a LPF 54. However, in the case of a RAM disk and a hybrid disk, a length of recorded information is discriminated by a data quantity discriminating section 78, when this length is not a required length, a test pattern generated in a test pattern generator 62 of media side EN/D and a servo circuit 60 is written in a RAM region of a disk. And the EFM signal envelope EFML is obtained using this test pattern, thereby, positioning adjustment of focus is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transducer (pickup) adjusting device in a device for recording and reproducing information on various discs such as MD (Mini Disc) and PC (Phase Cange type disc). Take
More specifically, it relates to improvement of a transducer adjustment device suitable for tracking and focus adjustment.

[0002]

2. Description of the Related Art For example, in an MD player, information is compressed and expanded in units of a predetermined block time and recorded or reproduced on a disc whose rotation is controlled at CLV (constant linear velocity). That is, at the time of recording, bibliographic information, voice information, etc. are recorded in a predetermined format at a constant linear velocity on a plurality of spirally engraved tracks from the inner circumference to the outer circumference on the disk by a magnetic head and a transducer. During playback,
The transducer reads the information recorded on the disc. In these cases, tracking for tracking the laser beam on the track and focus control of the laser beam are performed. Further, the rotation speed control and address detection of the disk are performed based on the wobbling signal obtained from the wobbling of the track.

A block diagram of an MD player is shown in FIG. In the figure, the input and output of digital signals are
This is directly performed on the EN (encoder) / D (decoder) & servo circuit 10 on the media side. However, input / output of analog audio signals is performed via the ADC (analog-digital converter) / DAC (digital-analog converter) 12. Also, the microphone input is the microphone amplifier 14
Headphone output is performed via the headphone amplifier 1
6 through.

An EN / D & memory controller 18 on the input / output side is connected to the EN / D & servo circuit 60 on the media side, and a shock proof memory 20 is connected to this. In the media side EN / D, EFM, A-
CIRC (Advanced-Cross Interleave Reed-Solomon
Encoding and decoding processes such as Code) are performed, and at the input / output side EN / D, ATRAC (Adap
Encoding and decoding of tive Transform Acoustic Coding) are performed.

Recording and reproduction of signals on the disk 22 are performed by a magnetic head 24 (only during recording) and a transducer (indicated by PU) 26 such as an optical pickup. The disk 22 is rotated by a spindle motor 28, and the recording head 24 and the transducer 26 are driven by a feed motor 30. These transducers 2
6, the drive of the spindle motor 28, the feed motor 30
This is performed by the motor driver 32.

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. Media side EN
The / 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. Further, the input / output side EN / D & memory controller 18, the preamplifier 50
Are connected to the system controller 70. The system controller 70 includes a high frequency superimposing device 42 and an LCD.
The display unit 44 and the key input unit 46 are also connected to each other.

Here, the basic operation of the apparatus configured as described above will be described. First, from the time of recording, an audio signal supplied from the outside is converted into a digital signal by the ADC / DAC 12 when it is an analog signal, and then supplied to the media side EN / D & servo circuit 60,
In addition, AT at the input / output side EN / D & memory controller 18
Information compression processing by RAC is performed. After timing control by the shock proof memory 20, the media side EN / D & servo circuit 60 performs EF for recording.
After the M and CIRC processes are performed, the magnetic head driver 3
8 are supplied.

On the other hand, the system controller 70 activates the spindle motor 28. Further, the magnetic head 24, 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,
Servo control is performed by the loop of the transducer 26 so that the magnetic head 24 and the transducer 26 are at predetermined positions.

That is, an error signal for controlling focus and tracking is detected from the transducer output. Then, these focus error signal and tracking error signal are fed back to the transducer 26 to control focus and tracking.

Further, by using the ADIP signal based on the wobbling of the track obtained by this loop, the media side EN / D & servo circuit 60 → motor driver 3
The CLV rotation control of the disk 22 by the PLL is performed by the circuit of the 2 → spindle motor 28.

Initially, the transducer 26 has a TOC (Table Of Contents) and U near the innermost circumference of the disk 22.
Move to TOC (User Table Of Contents)
The information of D is read out, and in some cases, the LCD display unit 4
It is displayed at 4. Then, the writing operation is started based on the key operation instructing the 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 magneto-optical recording of information is performed.

[0012] Next, during reproduction, 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 reflected by the disk 22. And a signal is obtained. These RF signal and servo signal are sent to the head amplifier 3
It is amplified by 4 and output to the preamplifier 50.

The RF signal is decoded by the media side EN / D & servo circuit 60, and
On the other hand, an error signal for focus and tracking control of the transducer 26 and an ADIP signal from the wobbling track are supplied from the preamplifier 50 to the media side EN / D & servo circuit 60, and focus and tracking control, or the spindle motor 28. Rotation control is performed.

The decoded signal is further subjected to error correction and the like, and the input / output side EN / D & memory controller 1
8, the timing control and the data expansion by the shock proof memory 20 are performed, and a digital audio signal is obtained. This signal is output as it is, or is supplied to the ADC / DAC 12 and converted into an analog audio signal and output.

Although each block shown in FIG. 2 is an example of an MD player, it can be commonly applied to a CLV type device, and CD or MD-data can be applied depending on the subsequent processing method of the obtained signal. Etc.

By the way, when information is recorded on or reproduced from various discs having different light reflectances, the laser beam power output from the transducer can be varied in a plurality of steps, and tracking and focusing can be performed. It is necessary to perform stable control. For example, when recording
The laser power is varied in multiple stages according to the disc variation. During playback, type (pre-mastered and MO
The laser power is varied in a plurality of steps according to the reflectance of disks having different states (a magneto-optical disk).

Further, in order to deal with these problems, it is necessary to adjust tracking and focus each time the laser power is switched in order to make the reproduction light of the transducer appropriate. Specifically, it is necessary to adjust the offset and balance of those error signals to make them appropriate. Particularly, in consideration of the 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 the focus error signal of the transducer.

In this case, even if the transducer is positioned at the center of the error signals such as the tracking error signal and the focus error signal based on the error signals, the actual signal quality is not always the best because of the optical influence of the detection element. It cannot be a point. For this reason, the read EFM (Eight to Fourteen Modu
lation) The amplitude of the signal is offset to the maximum point, or the jitter of the read EFM signal is offset to the minimum point (see, for example, Japanese Patent Publication No. 5-20060).

This is shown in FIG. 3, and the maximum point PA of the EFM output shown by the graph GA is on the minus side of the center "0" of the focus error signal in the example of the same figure. Further, the minimum point PB of the EFM jitter shown 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.

To explain the conventional adjustment method using this EFM signal, the transducer 26 is moved to the TOC area of the disk 22 and ID information such as whether the disk is a ROM, a RAM, or a hybrid in which these are mixed is read. If it is a ROM, adjustment is performed in the TOC area, and if it is a RAM or a hybrid, adjustment is performed in the ROM area such as the TOC area and the RAM area such as the UTOC area. The adjustment is performed manually, an EFM signal is obtained using the information recording portion of the disc 22, and the focus offset amount or balance adjustment is performed so that the level of the EFM signal becomes maximum or the jitter becomes minimum. Adjust and set the volume.

[0021]

However, the conventional technique for positioning and adjusting the transducer at the EFM signal maximum point or the jitter minimum point as described above is used when the EFM signal can be detected, that is, when the information signal is recorded. This is possible, but there is a disadvantage that the adjustment method cannot be applied to an area where an EFM signal is not recorded in MO or PC. 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.

The present invention focuses on these points,
It is an object of the present invention to provide a transducer adjusting device that can perform transducer positioning adjustment that provides excellent signal quality even when information is not recorded or the recording time is short, and that can be applied to various discs. .

[0023]

In order to achieve the above object, a first aspect of the present invention is a transducer adjusting device for adjusting the focus or tracking of a transducer for recording or reproducing information on a disk. R disc discriminating means for discriminating whether or not the ROM and RAM regions are included, data amount discriminating means for discriminating whether or not a recording signal in the RAM region of the disc has a predetermined length, and R for disc discriminating means.
When it is determined that there is an OM area and when the recording signal is determined to be longer than a predetermined length by the data amount determination means, the EFM signal detected in the ROM area or the RAM area is used. And an adjusting unit for adjusting focus or tracking.

In a second aspect of the present invention, in the transducer adjustment device, when the data amount determination means determines that the recording signal is less than a predetermined length, a signal having a predetermined length or more is recorded in the RAM area. Is provided, and the adjusting means detects the EFM signal from the signal recorded by the signal recording means to adjust focus or tracking.

[0025]

According to the present invention, in the case of a ROM disk, the EFM signal is detected while vibrating, and the positioning adjustment of focus and tracking is automatically performed by utilizing this. In case of RAM disk or hybrid disk,
The data amount determination unit 78 determines the length of the record information recorded in the RAM area. As a result, if there is a required length, automatic adjustment is performed as in the case of ROM.
However, if the length is not the required length, the test pattern is written in the RAM area of the disk and is used for automatic adjustment.

[0026]

Embodiments of the transducer adjusting apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. The same reference numerals are used for the same components as those of the above-described conventional technique or components corresponding to the conventional technique.

<First Embodiment> FIG. 1 shows the structure 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 this amplifier A2 is the 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 has a cutoff frequency of 20.
It is connected to the LPF 54 of KHz. This LPF 54
Outputs the envelope EFML of the EFM signal.

Next, the outputs A, B, C of the four-divided diodes (not shown) of the photo sensor of the transducer 26,
Of D, the output sides of A and D are O
It is connected to the inverting input side of the P amplifier A3, and 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 has a cutoff frequency of 10 KHz on the low frequency side and 40 on the high frequency side.
It is connected to the KPF BPF 56. An ADIP signal is output from the BPF 56.

Next, among the outputs A, B, C and D,
The output side of A and C is connected to the OP amplifier A4 via the resistors R and R1.
Is connected to the non-inverting input side of B, and the output sides of B and D are 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 the inverting input side of the OP amplifier A5 via the resistor R3,
They are connected to the resistors R4 and R5, respectively. A focus excitation signal F, which will be described later, is applied to the resistor R5 via a capacitor C.
K has been entered. The resistor R4 is an OP amplifier A5.
Is connected to the output side of.

A focus error signal FE is output from the OP amplifier A5. Also, O
The resistance value of the resistor R1 on the non-inverting input side of the P amplifier A4 can be varied 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.

Next, outputs E and F of a diode (not shown) adjacent to the four-divided diode of the transducer 26 are provided.
Are input to the non-inverting and inverting input sides of the OP amplifier A6 via resistors R6 and R7, respectively. The output side of the OP amplifier A6 is connected to the OP amplifier A7 via the resistor R8.
Are connected to the inverting input side of and the resistor R9. The resistor R9 is connected to the output side of the OP amplifier A7.

A tracking error signal TE is output from the OP amplifier A7. Also,
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.

Next, the EFM signal and BP of the OP amplifier A2
The ADIP signal of F52, the focus error signal FE of the OP amplifier A5, and the tracking error signal TE of the OP amplifier A7 are all the media side EN / D & servo circuit 6
It is being supplied to 0. The envelope (low frequency component) EFML of the EFM signal of the LPF 54 is A / D converted and supplied to the automatic adjustment unit 72 of the system controller 70. The shake signal FK is supplied. In addition, the focus balance signal FBAL is output from the automatic adjustment unit 72 of the system controller 70.
Is output.

Further, the system controller 70 is provided with a disk determination unit 76 and a data amount determination unit 78, respectively, 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 in the above-mentioned conventional technique. The other components are the same as in FIG.

Next, the operation of the first embodiment configured as described above will be described with reference to the flow charts of FIGS. 4 and 5. When the power of the apparatus is turned on, first, the focus offset adjustment is performed (FIG. 4, step S1). That is, although the laser beam of the transducer 26 is applied to the disk 22, it is generally in a defocused state in the servo-off state, so that there is no (A + C)-(B + D) signal output of the OP amplifier A4 of the preamplifier 50. Should be.

However, in reality, a voltage different from the reference value may be output from the OP amplifier A5 due to an offset of the circuit, a stray light component, or the like. Therefore, OP amplifier A5
The focus offset signal FOFS is adjusted so that the output of 1 becomes the reference value.

Next, the spindle motor 28 is started in this state (step S2). Then, the focus and tracking servos are turned on, and the error signal FE,
Focusing and tracking servo control is performed based on TE (step S3). Then, based on the operation instruction of the system controller 70, the transducer 2
6 moves to the TOC area of the disk 22 (step S
4).

Then, the information in the TOC area is read out,
A predetermined automatic adjustment operation, such as initial setting of laser power and gain of each amplifier, is performed. In the system controller 70, the disc determination unit 76 determines that the disc is ROM, RAM, or
Alternatively, it is determined whether it is a hybrid (step S
5).

As a result, when the disc is a ROM disc, the TO
Automatic adjustment operation is performed in the C area (step S
6). This automatic adjustment operation is shown in FIG. 5, 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, from the OP amplifier A3, (B + C)-(A
+ D) is output. Furthermore, from BPF52, ADIP
The signal is output.

Further, the OP amplifier A4 outputs (A + C)-(B + D) as described above. In contrast,
A focus excitation signal FK is output from the excitation unit 74 of the system controller 70. As a result, the OP amplifier A5 outputs the 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. Then, the focus coil (not shown) vibrates in the focus direction (left and right direction in FIG. 3) at the cycle of the excitation signal FK (step S62). It should be noted that this vibration is performed within the range of the focus servo.

When this vibration is performed, the focus position is changed to that shown in FIG.
To the left and right of the graph like the graph GD. When the focus position changes in this way, E on the graph GA
The amplitude of the FM signal comes to decrease. This EFM signal is supplied to the absolute value circuit 52, and its envelope EFML is taken out by filtering by the LPF 54 (step S63).

Envelope EFML of this EFM signal
Is A / D converted and taken into the automatic adjustment unit 72 of the system controller 70. Here, in order to increase the measurement accuracy by taking in signals by A / D conversion in order to reduce the effects of disk defects, surface wobbling, eccentricity, differences in recording signals, etc. The sampling is performed (step S63), and the vibration is performed, for example, 16 times (step S64).

Here, the EFM signal envelope EFML
Is taken in synchronism with the excitation signal FK, measured separately on the left and right with respect to the center of the graph shown in FIG. 3, and added on the left and right, and averaged to obtain measured values LR and LL. Note that 256 vibrations are sampled with one excitation, so 256/2 = 128 for each of the left and right sides.
Times.

In the automatic adjustment unit 72, these measured values L
R and LL are compared and it is determined whether the difference between them is within a predetermined range (step S65). And as a result,
When the difference between the measured values LR and LL is within the predetermined range, EF
Since it is considered that the M signal is maximum and the focus balance is in an appropriate state, the adjusting operation ends (step S66). This state will be described with reference to the graph G in FIG.
The maximum point PA of the EFM output of A is in a state substantially coincident with the center "0" of the focus error.

However, when the difference between the measured values LR and LL is large, the value of the resistor R1 on the input side of the OP amplifier A4 is changed by one step by the automatic adjusting section 72 (step S).
67). Specifically, the balance signal FBA is set so that the gain is increased when the input A + C of the OP amplifier A4 is small and the gain is decreased when the input A + C is large.
The resistor R1 is adjusted by L. Then, the focus is excited again and the above-described operation is repeated (steps S62 to S67).

By this adjustment, the maximum point PA of the EFM output of the graph GA comes close to the center "0" of the focus error. Then, by repeating this adjustment operation, the offset indicated by ΔF in FIG. 3 is eventually applied, and the focus positioning adjustment is performed at the EFM maximum output point.

Next, returning to FIG. 4, a case will be described in which the disk determination unit 76 of the system controller 70 determines that the disk is a RAM or a hybrid disk based on the information in the TOC area of the disk 22 (step S5). In this case, it is necessary to measure and adjust not only the ROM area but also the RAM area.

First, the transducer 26 is placed in the TOC area.
Is moved to perform the automatic adjustment operation shown in FIG. 5 (step S7). Next, the transducer 26 is moved to the UTOC area (step S8), and the recording data is searched here. Then, 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. Figure 5
Since the automatic adjustment shown in (1) takes, for example, about 100 ms, it is determined whether or not the required measurement time, in which the time for timing control is added as a margin, is longer than the calculated recording data time.

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). , The automatic adjustment operation shown in FIG. 5 is performed (step S11). However, when it is determined that the data recording time is shorter than the measurement required time (N in step S9), T is determined in step S7.
The RAM area is set using the value adjusted in the OC area (step S12). Steps S13 to S15 will be described later.

It should be noted that RO is adjusted by the above adjusting operation.
The measured value obtained for each of the M and RAM areas, that is, the value of the input side resistor R1 of the OP amplifier A4 of the preamplifier 50 (or the focus balance signal FBA corresponding thereto)
L) is stored in, for example, a memory (not shown) of the system controller 70, and a corresponding value is supplied to the preamplifier 50 when the disk 22 is accessed.

<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 measurement required time, the transducer 2 is first placed in the RAM free area of the disk 22.
6 is moved (step S13).

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 the 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, normal recording / reproduction will not be hindered.

As described above, according to the embodiment of the present invention,
It has the following effects. (1) According to the first embodiment, when the signal is not recorded on the disc, or when the recorded signal is not long enough for adjustment, it is obtained by using the TOC area which is the ROM area. Since the focus balance value that maximizes the EFM signal is applied to the RAM area to adjust the focus, the focus can be adjusted favorably to the best point without being affected by the information writing state of the disc, and the signal recording can be performed. Since it is not affected by the presence or absence of, it can be applied to various discs.

(2) According to the second embodiment, when the signal is not recorded on the disc or when the recorded signal is not long enough for adjustment, the test signal is recorded in the RAM area. Then, by using this, the focus balance value that maximizes the EFM signal is obtained to adjust the focus, so that the focus can be adjusted to the best point more favorably without being affected by the information writing state of the disc. Since it is not affected by the presence or absence of signal recording, it can be applied to various discs. (3) In any of the examples, since the focus is vibrated during the adjustment, the measured value can be quickly obtained in a short time.

<Other Embodiments> The present invention is not limited to the above embodiments, and includes, for example, the following. (1) In the above-described embodiment, the present invention is applied to focus adjustment, but it is also applicable to tracking adjustment. In this case, the excitation signal may be applied to the inverting input side of the OP amplifier A7 of the preamplifier 50 shown in FIG. (2) In the above embodiment, the focus is adjusted so that the EFM signal becomes maximum, but the jitter of the EFM signal may be detected and adjusted so that the jitter of the EFM signal becomes minimum.

(3) Without vibrating the focus,
Although it is possible to adjust the focus by adjusting the gain of the servo system, it is possible to perform the adjustment quickly in a short time by performing the vibration. (4) The circuit configurations shown in FIGS. 1 and 2 can be modified in various ways so as to achieve the same operation. Alternatively, it may be performed by software using a microprocessor.

[0057]

As described above, the transducer adjusting device according to the present invention has the following effects. (1) Since the length of the signal recorded in the RAM area of the disc is determined and if the length is equal to or longer than a predetermined length, the EFM signal of the signal is used to adjust the focus or tracking. Poor adjustment due to shortness is avoided.

(2) The length of the signal recorded in the RAM area of the disc is judged, and when the length is not longer than a predetermined length, the adjustment signal is recorded and the EFM signal obtained from this is used for focusing. Alternatively, since the positioning is adjusted for tracking, it is possible to adjust the positioning of the transducer with the best signal quality even when the information is not recorded on the disk or the recording time is short. Can handle.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a main part of an embodiment of a transducer adjusting device 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 the relationship between focus error and various signals.

FIG. 4 is a flowchart showing a main operation of the device.

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 ... Disk 24 ... Magnetic head 26 ... Transducer 28 ... Spindle motor 30 ... Feed motor 32 ... Motor driver 34 ... Head amplifier 38 ... Magnetic head driver 42 ... LCD display section 44 ... Key input section 50 ... Preamplifier 52 ... Absolute value circuit (envelope detecting means) 54 ... LPF (envelope detecting means) 56 ... BPF 60 ... Media side EN / D & Servo circuit 62 ... Test pattern generator 70 ... System controller 72 ... Automatic adjustment section (adjustment means) 74 ... Excitation section (excitation section) 76 ... Disc determination section (disc determination section) 78 ... Data amount determination section (data amount) (Determination means)

Claims (2)

[Claims] 1. A transducer adjusting device for adjusting the focus or tracking of a transducer for recording or reproducing information on or from a disc, and disc determining means for determining whether the disc includes a ROM or RAM area. A data amount judging means for detecting the length of the recording signal in the RAM area of the disk and judging whether or not it is a predetermined length; and a case where the disk judging means judges that there is a ROM area, and the data amount judging When the recording signal is determined to be equal to or longer than a predetermined length by the means, an adjusting means for adjusting focus or tracking using the EFM signal detected in the ROM area or the RAM area, respectively, is provided. Transducer adjustment device. 2. The transducer adjusting device according to claim 1, wherein when the data amount judging means judges that the recording signal is shorter than a predetermined length, a signal having a predetermined length or longer is recorded in the RAM area. A transducer adjusting device comprising: a signal recording unit for adjusting the focus or tracking by detecting an EFM signal from the signal recorded by the adjusting unit.