JP2925490B2 - Information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus for recording information on a recording medium and reproducing the information from the recording medium, and more particularly, a plurality of recording methods in one recording medium. The present invention relates to an information recording / reproducing apparatus having a function of reproducing a recording medium as described above and adjusting the characteristics of a servo circuit by itself.

[0002]

2. Description of the Related Art In recent years, MDs (mini-discs) have become widespread as alternatives to CDs (compact discs). Unlike CDs, there are two types of MDs, a recording / playback disk that allows recording by the user and a read-only disk that cannot record by the user. In a read-only disc, an optical disc similar to a CD is used, and information is recorded by irregularities called pits. On the other hand, a magneto-optical disk is used as a recording / reproducing disk, and information called TOC (Table Of Contents) is recorded in pits, and the voice, title, number of recorded songs, and the like recorded by the user are magnetically recorded. This magnetically recorded groove-shaped portion is called a groove. Then, the information recorded by the pits is read based on the change in the amount of reflected light, and the information recorded in the groove by magnetism is read based on the direction of the deflection surface of the reflected light.

[0003] In an MD player for reproducing a recording medium in which a plurality of areas having different recording methods coexist, such as a recording / reproducing disc, servo characteristics suitable for accessing the respective recording areas often differ. for that reason,
When realizing a self-adjustment function for correcting variations in disk characteristics and changes over time in devices, it is necessary to adjust servo characteristics for each recording area.

[0004]

Therefore, the self-adjustment of the servo characteristics performed every time the power is turned on in the MD player has caused a problem that the time until the reproduced sound is actually output is prolonged.

In view of such circumstances, an object of the present invention is to provide an information recording apparatus having a function of reproducing a recording medium in which a plurality of recording methods are mixed in one recording medium and of adjusting the characteristics of a servo circuit by itself. An object of the recording / reproducing apparatus is to reduce the time required for the self-adjustment.

[0006]

[MEANS FOR SOLVING THE PROBLEMS] The T of the recording / playback disk
In the OC area, information that does not change due to recording by the user, such as outermost position information and start position information of an area to be recorded by the user, is recorded. Therefore, TOC
If the information is read and stored, the MD player does not need to reproduce the TOC area again. The present invention achieves the above object by adopting the technical configuration described below based on such knowledge.

That is, an information recording / reproducing apparatus according to the present invention comprises a head for reading information from a recording medium, a servo circuit for driving the head, and a recording medium having a plurality of areas recorded by different recording methods. Self-adjustment means for performing a plurality of self-adjustments on the characteristics of the servo circuit for each of the plurality of areas; and information recorded in a predetermined area of the plurality of areas is already read at the start of recording or reproduction. Control means for suspending the self-adjustment by the self-adjustment means for the predetermined area and executing the self-adjustment only in an area other than the predetermined area. I do.

In the information recording / reproducing apparatus according to the present invention configured as described above, at the start of recording or reproduction,
If information recorded in a predetermined area of a plurality of areas recorded by different recording methods has already been read and stored, self-adjustment for the predetermined area is stopped, and information other than the predetermined area is stopped. Since the self-adjustment is performed only for the region of the above, the self-adjustment time is reduced.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing a configuration of an MD player as an embodiment of an information recording / reproducing apparatus according to the present invention. A magneto-optical disk 2 in an MD (mini disk) 1 is housed in a cartridge 3 and is rotated by a spindle motor 4. Information recorded on the magneto-optical disk 2 is reproduced by reflected light of laser light emitted from an optical head 7 having an objective lens 5 and an optical pickup 6. At this time, the information in the pit area is reproduced based on the change in the amount of reflected light, while the information recorded in the magnetic field, that is, the information in the groove area, is reproduced based on the direction of the deflection surface of the reflected light.

The optical pickup 6 is moved by a feed motor 8. The pits and grooves are provided spirally on the disk surface, and the optical head 7 reads information by tracing the track on which the pits or grooves are provided at a constant linear velocity (CLV: Constant Linear Velocity). Therefore, the spindle motor 4
The speed is controlled by the servo circuit 9. The optical head 7 is provided with a tracking mechanism for following a track on the disk and a focusing mechanism for focusing a laser beam. The tracking mechanism is controlled by a tracking servo circuit 14, while the focus mechanism is controlled by a focus servo circuit 15. Tracking servo circuit 14 and focus servo circuit 1
5 is controlled by the system control 10.

Information detected by the optical pickup 6 of the optical head 7 is input to a tracking / focus error amplifier 13 via a high frequency (RF) amplifier 11 and an automatic gain control circuit (AGC) 12. The operation of the optical pickup 6 is directly input to the tracking / focus error amplifier 13. In the tracking / focus error amplifier 13, an error between the control target value of the optical pickup 6 and the actual movement amount is calculated and input to the system control 10. Further, the feed motor 8 is driven and controlled by a sled servo circuit 16 to which a signal from the tracking servo circuit 14 is input. The system control 10 is connected to a data rewritable nonvolatile memory 17 and a temperature sensor 18.

The MD player configured as described above is provided with a self-adjustment function by the system control 10 in order to correct variations in disc characteristics and changes over time in equipment. The self-adjustment items of the MD player include a focus servo gain and a tracking servo gain. The gain adjustment must be performed for each recording area for a recording medium in which a plurality of areas having different recording methods are mixed, such as a recording / playback disc, and the reproduced sound is actually output. This caused a problem that the time required to complete the operation was long.

FIG. 2 is a diagram showing a configuration of the recording / reproducing disk 2. As shown in FIG. As shown in this figure, the disk 2
It comprises a lead-in area (TOC area) 2a, a user TOC area 2b, a program area 2c and a lead-out area 2d. The TOC area 2a forms a pit area, and the other areas form a groove area. In the TOC area 2a, information which does not change due to recording by the user, such as outermost position information and start position information of an area to be recorded by the user, is recorded. Therefore, if the TOC information is read and saved, the MD
The player does not need to reproduce the TOC area again, and as a result, does not need to perform self-adjustment for the pit area.

FIG. 3 is a graph showing an example of M based on the above findings.
It is a flowchart which shows the processing procedure of a D player starting routine. First, in step 110, it is determined whether or not the read flag is 1, that is, whether or not the reading of the TOC area 2a has been completed. If the read has been completed, the process proceeds to step 150, and if not, the process proceeds to step 120.

In step 120, the self-adjustment for the pit area is performed, and the flow advances to step 130. Step 1
At 30, the TOC area 2 a is read, the information is stored in the nonvolatile memory 17, and the process proceeds to step 140. At step 140, a read flag is set, and the routine proceeds to step 150. The read flag is reset when the disk is removed. Step 1
At 50, the self-adjustment for the groove area is performed, and the routine proceeds to step 160. Finally, in step 160, the user TOC area 2b is read, and this routine ends.

Although the embodiments of the present invention have been described above, the present invention is of course not limited to these embodiments, and it will be easy for those skilled in the art to devise various embodiments.

[0018]

As described above, according to the present invention,
In an information recording / reproducing apparatus that reproduces a recording medium in which a plurality of recording methods are mixed in one recording medium and has a function of self-adjusting the characteristics of a servo circuit, the time required for the self-adjustment is reduced. It becomes possible. That is,
Unnecessary adjustment can be prevented, and it is possible to reduce the time from when the user instructs to start playing to when the sound is actually output.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an MD player as one embodiment of an information recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing a configuration of a recording / reproducing disc.

FIG. 3 is a flowchart showing a processing procedure of an MD player start routine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... MD (mini disk) 2 ... Magneto-optical disk 2a ... Lead-in area (TOC area) 2b ... User TOC area 2c ... Program area 2d ... Lead-out area 3 ... Cartridge 4 ... Spindle motor 5 ... Objective lens 6 ... Optical pickup 7 optical head 8 feed motor 9 CLV servo circuit 10 system control 11 RF amplifier 12 automatic gain control circuit (AGC) 13 tracking / focus error amplifier 14 tracking servo circuit 15 focus servo circuit 16 thread Servo circuit 17: Non-volatile memory

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 7/09-7/095 G11B 19/02 G11B 21/10

Claims (1)

(57) [Claims] A head for reading information from a recording medium; a servo circuit for driving the head; and a recording medium having a plurality of areas recorded by different recording methods. Self-adjustment means for performing a plurality of self-adjustments for each area; and at the start of recording or reproduction, when information recorded in a predetermined area of the plurality of areas is already read and stored, An information recording / reproducing apparatus, comprising: control means for stopping the self-adjustment by the self-adjustment means for the predetermined area and executing the self-adjustment only in an area other than the predetermined area.