JP2005166143A - Method and apparatus for reproducing record information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk reproducing apparatus where a desired signal can be read reliably by detecting the positions of a prescribed program area and a lead in area. <P>SOLUTION: An MD recording and reproducing apparatus 10 for reproducing a mini disk 1 at the number of revolution corresponding to the recording areas of a pit signal part, a groove signal part and a wobble signal part is provided with a pickup 3 for converting the signal to an electric signal corresponding to a pit signal, a groove signal and a wobble signal and outputting it to the mini disk 1, a tracking control means 8a for following a track by a tracking error signal, a kicking means 8b and a searching means 8c for reproducing information by following the track, a disk revolution number detection means 8d for detecting the increase/reduction of the number of revolution of the mini disk 1, and a prescribed area position discrimination means 8e for discriminating whether the pickup 3 is positioned in an predetermined area by the disk revolution number detection means 8d. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a recorded information reproducing method and a recorded information reproducing apparatus for reading and reproducing information recorded on a recording medium such as a disk by a pickup.

  In general, in an optical reproducing apparatus for recording and reproducing information on a magneto-optical disk, an optical component called a pickup is used to read a desired music data signal from a music program written in a program area of the disk, for example. Yes. This pickup can be moved from the inner periphery to the outer periphery of the magneto-optical disk in a direction perpendicular to the rotation direction of the magneto-optical disk by a feed motor.

Hereinafter, a conventional address detection method in such an optical reproducing apparatus will be described with reference to the drawings, taking an MD (mini disk) recording / reproducing apparatus as an example.
As shown in FIG. 3, a conventional MD recording / reproducing apparatus 20 mainly includes a so-called mini-disc 1, which is a magneto-optical disc as a recording medium, a spindle motor 2, a pickup 3, a feed motor 4, a driver circuit 5, and an RF amplifier 6. , A digital signal processor (hereinafter referred to as DSP) 7, and a system controller (hereinafter referred to as microcomputer) 18.

The spindle motor 2 is for rotating the mini disk 1.
The pickup 3 includes a semiconductor laser, an objective lens, an actuator for the objective lens, a light receiving element, other optical components, and the like (not shown) as conventionally known.

  The feed motor 4 moves the pickup 3 in the radial direction of the mini disk 1. The driver circuit 5 drives the actuator of the pickup 3 and the spindle motor 2. The RF amplifier 6 amplifies the signal incident on the light receiving element of the pickup 3. The DSP 7 demodulates the signal obtained from the pickup 3, performs calculation based on the signal, and sends a control signal to the driver circuit 5. The microcomputer 18 controls the exchange of signals between these circuits.

  When trying to reproduce the mini disc 1 with the MD recording / reproducing apparatus 20, first, a user table of contents (hereinafter referred to as UTOC) to be called a table of contents of the contents recorded on the mini disc 1 is read. There is a need.

  In addition, information necessary for the user to record in the mini-disc 1 in the lead-in area further inside the so-called program area in which the UTOC is recorded (hereinafter referred to as PTOC). When recording is performed on a recordable mini-disc, the information in the lead-in area must also be read.

  Therefore, a pickup inner circumferential position detection switch (hereinafter referred to as a lead-in switch) is provided and reproduced so that the PTOC of the innermost circumferential portion can be read and the pickup 3 does not go inside. When starting the process, first move the pickup to the lead-in switch and check the address in the lead-in area and then read the PTOC as necessary, or move to the outer program area and read the UTOC. Has been.

Here, an example of the operation of the conventional MD recording / reproducing apparatus 20 will be described with reference to a flowchart.
In the initial operation of the MD recording / reproducing apparatus 20, as shown in FIG. 4, first, the spindle motor 2 is activated to rotate the mini disk 1 (S101). At the same time as the spindle motor 2 rotates, the focus is pulled in, and the CLV servo mode is entered to read the address on the spot (S102).
Here, the CLV servo mode is a control in which the tangential speed (linear velocity) of the rotating recording medium is constant.

  Then, the pickup 3 is moved toward the lead-in switch toward the center of the mini disc (S103), and it is determined whether or not the address can be read (S104).

  If the address can be read, it is determined whether the mounted mini disk 1 is a recording disk (S106).

  If it is determined that the disc is a recording disc, the pickup 3 is moved to the lead-in area where the PTOC is recorded and the PTOC is read (S107), and then the pickup 3 is moved to the program area where the UTOC is recorded. The UTOC is read (S108).

  On the other hand, if it is determined that it is not a recording disk (S106), the pickup 3 is moved to the program area and the UTOC is read (S108).

If the address cannot be read in S104, a disk abnormality is indicated on a display panel (not shown) or the like (S105).
In this way, the initial operation is performed.

  As described above, the conventional MD recording / reproducing apparatus 20 is configured. However, providing a lead-in switch leads to an increase in cost, and the mounting position of the lead-in switch requires high accuracy. There is a problem that the assembly work of the mechanism of the recording / reproducing apparatus is further complicated.

Therefore, disk detecting means for detecting the presence or absence of a mini disk in the MD recording / reproducing apparatus, search means for moving the optical pickup to a predetermined position of the mini disk, and initial operation control means for controlling the operation of the pickup on the mini disk, There has been proposed one in which an initial operation can be performed without providing a lead-in switch (see Patent Document 1).
Japanese Patent Laid-Open No. 7-176057 (page 1-3)

  However, simply removing the lead-in switch reads UTOC information or PTOC information, so when the pickup is moved to the inner periphery, the signal cannot be read if the pickup reaches the wrong area. There was a problem. This is because the UTOC information is recorded in the groove portion, while the PTOC information is recorded in the pits.

  Further, even when the pickup deviates from the control of the MD recording / reproducing device due to vibration and moves to the outermost periphery, this portion is a mirror portion where no signal is recorded, so the MD reproducing device reads the signal. There was a problem that I could not.

  The present invention has been made in view of the above-mentioned conventional problems, and even if the lead-in switch is eliminated, the position of a predetermined program area or lead-in area is appropriately detected to ensure a desired signal. It is an object of the present invention to provide a disc reproducing apparatus that can be read easily.

The present invention relates to a recorded information reproducing method, and rotates a recording medium on which a plurality of information is recorded in a recording area, and records information at a rotation speed corresponding to each recording area preset by a recording information detecting means. In a recording information reproducing method for detecting, detecting predetermined recording information from a predetermined recording area, converting it into an electric signal corresponding to the recording information and reproducing it, the position moved by moving the recording information detection means The number of rotations of the recording medium corresponding to the recording area is detected, and whether or not the recording information detection means is located in a predetermined recording area is determined based on the detection result.
Here, the “number of rotations” indicates the number of rotations of the recording medium per unit time.

  Whether or not the recording information detecting means is located in a predetermined recording area is preferably determined by increasing or decreasing the number of rotations of the detected recording medium.

  Further, whether or not the recording information detecting means is located in a predetermined recording area can be determined based on a result of comparing the detected rotational speed of the recording medium with a reference rotational speed of the predetermined recording area. preferable.

  Further, in the recording area, a lead-in area having a pit signal part in which information relating to the recording medium is recorded, a groove signal part in which main information is recorded, and address information corresponding to the position of the recorded information are recorded. It is preferable that a program area having a wobble signal portion formed is formed.

  The present invention also relates to a recorded information reproducing apparatus, wherein the recorded information is detected by a rotating means for rotating a recording medium on which a plurality of information is recorded in a recording area, and a rotation speed corresponding to each preset recording area. A recording information detecting means for detecting predetermined recording information from a predetermined recording area, converting the detected recording information into an electric signal corresponding to the recording information, and reproducing the electric signal. A recording medium rotation number detecting means for detecting; and a predetermined area position determining means for determining whether or not the information detecting means is located in a predetermined recording area based on a detection result of the recording medium rotation number detecting means. It is characterized by.

  Preferably, the predetermined area position determining means is determined by increasing or decreasing the rotation speed of the recording medium detected by the recording medium rotation speed detecting means.

  Further, it is preferable that the predetermined area position discriminating means discriminates based on a result of comparing the rotation speed of the recording medium detected by the recording medium rotation speed detecting means with a reference rotation speed of the predetermined recording area.

  In the recording area, a track on which information is recorded is formed on the surface, a lead-in area having a pit signal part in which information on the recording medium is recorded, a groove signal part in which main information is recorded, and the main information Preferably, a program area having a wobble signal portion in which address information corresponding to the position is recorded is formed.

  Further, the recorded information reproducing apparatus includes, as the recorded information detecting means, a pickup that converts the return light of the beam irradiated onto the recording medium into an electrical signal corresponding to a pit signal, a groove signal, and a wobble signal, and outputs the electrical signal. And a tracking control means for following the track from a tracking error signal from the pickup, a kick means for jumping over the track by the tracking control means, and a search means for reproducing the information recorded following the track. preferable.

  Further, the recording medium is formed with a blank portion where no information is recorded on the inner side toward the center of rotation from a recording area where a track on which information is recorded is formed, and the pickup moves into the blank portion. It is preferable to provide a pickup movement control means for limiting the above.

The operation of the present invention will be described.
For example, when the present invention is adopted in an MD recording / reproducing apparatus, the operation of the MD recording / reproducing apparatus is as follows. First, a pickup as recording information detecting means is arranged on a mini-disc (MD) which is a magneto-optical disk as a recording medium. It is determined whether the pickup can read the signal at the position where the operation starts.

  When the signal can be read, the pickup is moved to the lead-in area in the recording area, that is, the area where the UTOC information is recorded, and the UTOC reading operation is performed.

  Next, after moving the pickup, or at the same position, the MD recording / reproducing apparatus performs an operation of reading predetermined recording information.

  When the rotation speed of the mini-disc is detected by the recording medium rotation speed detection means and determined to be slower than the predetermined rotation speed by the predetermined area position determination means, that is, compared with ADIP that is the basis of the address signal, recording is performed. When the frequency of the EFM waveform is high, it is determined that the user is in the lead-in area. At this time, the MD recording / reproducing apparatus is in the pit reading mode and can read the information of the pit signal portion in the lead-in area.

  On the other hand, when it is determined that the rotational speed of the mini-disc is faster than the predetermined rotational speed, that is, in an area where there is no EFM carrier, the pickup is a blank part in which information on the outermost periphery is not recorded, a so-called mirror part. It is judged that it is located in.

  At this time, the MD recording / reproducing apparatus can move the pickup to the inner circumference side of the mini disk by a predetermined amount, read the ADIP address signal at that position, and then move to the desired address in the program area.

  As described above, according to the recorded information reproducing method and the recorded information reproducing apparatus of the present invention, the initial operation can be executed without using the lead-in switch to reliably read the UTOC and PTOC in the recording area. it can. As a result, the lead-in switch that requires high accuracy in mounting and positioning, the wiring associated therewith, and the like can be eliminated, and an excellent effect can be achieved in that the mechanism assembly work can be simplified.

  Specifically, according to the recording information reproducing method of the present invention, the recording information detecting means is moved to detect the rotational speed of the recording medium corresponding to the recording area at the moved position. By determining whether or not the recording information detection means is located in a predetermined recording area, it is possible to determine the predetermined position of the recording information detection means according to the number of rotations of the recording medium, so without using a lead-in switch, It is possible to reliably read the address signal of the desired recording information.

  The number of rotations corresponding to the recording area is set in advance by determining whether or not the recording information detection means is located in a predetermined recording area by determining the increase or decrease in the number of rotations of the detected recording medium. Therefore, it is possible to easily determine the position of the recording information detecting means based on the detected rotational speed of the recording medium.

  Further, the determination as to whether or not the recording information detecting means is located in a predetermined recording area is made by determining the result of comparing the detected rotational speed of the recording medium with the reference rotational speed of the predetermined recording area. Since the rotational speed corresponding to the recording area is set in advance, the position of the recording information detecting means can be easily determined according to the detected rotational speed of the recording medium.

  Further, as the recording area, a lead-in area having a pit signal part in which information relating to a recording medium is recorded, a groove signal part in which main information is recorded, and address information corresponding to the position of the recorded information are recorded. By forming a program area having a wobble signal portion, the recording information detecting means is moved to a predetermined recording area, and the information recorded on the disc is discriminated by a pit signal, a groove signal and a wobble signal and desired. The recorded information can be read accurately.

  According to the recorded information reproducing apparatus of the present invention, the recording medium rotation speed detecting means for detecting increase / decrease in the rotation speed of the recording medium, and the information detecting means in a predetermined recording area based on the detection result of the recording medium rotation speed detecting means. The predetermined area position determining means for determining whether or not the recording information is positioned, so that the predetermined position of the recording information detecting means can be determined according to the number of rotations of the recording medium, so without using a lead-in switch, It is possible to reliably read the address signal of the desired recording information.

  Since the predetermined area position determining means is determined by increasing or decreasing the rotation speed of the recording medium detected by the recording medium rotation speed detecting means, the rotation speed corresponding to the recording area is set in advance. The position of the recording information detecting means can be easily determined based on the detected rotational speed of the recording medium.

  Further, the predetermined area position determining means is determined based on a result of comparing the rotation speed of the recording medium detected by the recording medium rotation speed detecting means with a reference rotation speed of the predetermined recording area. Since the rotational speed corresponding to the area is set in advance, the position of the recording information detecting means can be easily determined based on the detected rotational speed of the recording medium.

  Further, as the recording area, a track on which information is recorded is formed on the surface, a lead-in area having a pit signal part in which information on the recording medium is recorded, a groove signal part in which main information is recorded, and the main information A program area having a wobble signal portion in which address information corresponding to the position of the disc is recorded, so that the information recorded on the disc is discriminated by a pit signal, a groove signal and a wobble signal, and a predetermined recording area The desired recording information can be read accurately.

  Further, the recording information reproducing apparatus includes a pickup that converts the return light of the beam irradiated on the recording medium into an electrical signal corresponding to a pit signal, a groove signal, and a wobble signal and outputs the recording information detection unit as the recording information detection unit. Thus, it is possible to reliably determine the desired recording information, and further, the tracking control means for following the track from the tracking error signal from the pickup, the kick means for jumping over the track by the tracking control means, and the recording following the track. Provided with search means for reproducing the recorded information, the desired recorded information can be read in a short time.

  Furthermore, a blank portion in which no information is recorded is formed on the recording medium in a direction toward the center of rotation from a recording area in which a track on which information is recorded is formed, and the pickup moves into the blank portion. Since the pickup movement control means for limiting is provided, the pickup does not reach the blank portion of the recording medium, so that the position detection of the pickup as the recording information detection means can be reliably performed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 and FIG. 2 are examples of embodiments for carrying out the present invention. FIG. 1 is a block diagram showing the configuration of an MD recording / reproducing apparatus as a disk reproducing apparatus according to an embodiment of the present invention. It is a flowchart of the initial operation | movement of an apparatus.
In the figure, the parts denoted by the same reference numerals represent the same thing, and the basic configuration is the same as the conventional one shown in the figure.

  As shown in FIG. 1, an MD recording / reproducing apparatus 10 as a recorded information reproducing apparatus according to the present embodiment mainly includes a so-called mini disk 1 which is a kind of magneto-optical disk as a recording medium, and a spindle motor as a rotating means for the recording medium. 2. A recording information detecting means includes a pickup 3, a feed motor 4, a driver circuit 5, an RF amplifier 6, a digital signal processor (hereinafter referred to as DSP) 7, and a system controller (hereinafter referred to as microcomputer) 8. In an MD recording / reproducing apparatus that detects predetermined recording information from a predetermined recording area, converts it into an electric signal corresponding to the recording information and reproduces it, a disk rotational speed detecting means (recording) for detecting the rotational speed of the mini disk 1 (Medium rotation speed detection means) 8d and the detection result of the disk rotation speed detection means 8d, pick up to a predetermined recording area. 3 is that a predetermined area position determining means 8e for determining whether or not the position.

  The mini-disc 1 has a track (not shown) on which information is recorded as a recording area, a lead-in area in which a pit signal portion in which information relating to the recording medium is recorded, and main information is recorded. And a wobble signal portion in which address information corresponding to the position of the main information is recorded is formed. Further, the program area is formed inwardly of the recording area toward the center of rotation, that is, the read area A blank portion in which no information is recorded, that is, a so-called mirror region is formed inside the in region. Similarly, a mirror region is formed in the outer peripheral portion.

That is, the pit signal portion is formed in the innermost peripheral portion of the track on which information is recorded.
The groove signal portion is formed on a track on the outer peripheral side from the pit signal portion.
The wobble signal part is formed on the side of the track of the groove signal part.

The spindle motor 2 is for rotating the mini disk 1.
The pickup 3 includes a semiconductor laser (not shown), an objective lens, an actuator for the objective lens, a light receiving element, and other optical components as is well known in the art. The signals are converted into electrical signals corresponding to the signals and the wobble signals, respectively, and output.
The feed motor 4 moves the pickup 3 along the radial direction of the mini disk 1.

The driver circuit 5 drives an actuator (not shown) of the pickup 3 and the spindle motor 2.
The RF amplifier 6 amplifies the signal incident on the light receiving element of the pickup 3.
The DSP 7 demodulates the signal obtained from the pickup 3, calculates based on the signal, and sends a control signal to the driver circuit 5.
The microcomputer 8 controls the exchange of signals between these circuits.

  The microcomputer 8 includes a tracking control unit 8a that tracks a track based on a tracking error signal from the pickup 3, and a plurality of tracks that are skipped, and the tracking control unit 8a tracks the track of the mini disk 1 from the jumped position. There are provided kick means 8b and search means 8c for reproducing the information recorded on the mini-disc 1, and the above-mentioned disk rotational speed detection means 8d and predetermined area position discrimination means 8e.

  The microcomputer 8 detects the rotational speed of the mini disk 1 by the disk rotational speed detection means 8d, and determines whether or not the rotational speed of the mini disk 1 has increased or decreased by a predetermined area position determination means 8e to pick up a predetermined area 3 Whether or not is located is determined.

Next, an initial operation associated with power-on in the MD recording / reproducing apparatus 10 of this embodiment will be described with reference to a flowchart.
As shown in FIG. 2, in the initial operation of the MD recording / reproducing apparatus 10, first, the spindle motor 2 is activated to rotate the mini disk 1 (S1).

Then, the focus is pulled in simultaneously with the rotation of the spindle motor 2, and the CLV servo mode is entered to read the address on the spot (S2).
Then, it is determined whether or not the address can be read by the pickup 3 arranged facing the mini disk 1 (S3).

  If the address is readable, the amount of movement of the pickup 3 is calculated from the address position, and the process proceeds to S10 to read the PTOC or UTOC.

  On the other hand, if the address cannot be read in S3, different processing is performed according to the rotational speed of the mini disk 1 detected by the disk rotational speed detection means 8d (S4).

  First, in S4, when the rotational speed of the mini-disc 1 is slower than the rotational speed range determined in the range in which the address can be read (hereinafter referred to as “reference speed range” in this embodiment), the CLV servo. In the mode, since the EFM waveform is higher than that of ADIP, the predetermined area position discriminating means 8e determines that the pickup 3 is in the pit signal portion of the recording area (S5), and returns to S3 again to read the address. Is done.

  If it is determined in S5 that the pickup 3 is in the pit signal portion of the lead-in area, the mini-disc 1 is adjusted to the rotational speed corresponding to the pit signal portion. If the address can be read in S3, the process proceeds to S10.

  On the other hand, in S4, when the rotational speed of the mini-disc 1 is faster than the reference speed range, the EFM waveform is not detected, so that the predetermined area position discriminating means 8e determines that the pickup 3 is in the outer mirror area, A predetermined amount is moved to the inner peripheral side (S6), and the process returns to S3 again to read the address.

  In S6, when it is determined that the pickup 3 is in the outer mirror region, the mini-disc 1 is adjusted to the rotational speed corresponding to the pit signal portion. If the address is readable, the process proceeds to S10 to read PTOC or UTOC information.

If the rotational speed of the mini-disc 1 is within the reference speed range in S4, it is determined by the predetermined area position discriminating means 8e that the pickup 3 is in the pit signal portion, and is retried at the same place ( S7), it is determined whether the address can be read (S8).
If the address cannot be read in S8, the disk abnormality is indicated on the display panel (not shown) or the like (S9).

  On the other hand, if the address is readable, the process proceeds to S10 to determine whether or not the mounted mini disk 1 is a recording disk.

  If it is determined in S10 that the disc is a recording disc, the pickup 3 is moved to the PTOC area and the PTOC is read (S11), and then the pickup 3 is moved to the UTOC area and the UTOC is read (S12).

On the other hand, if it is determined that it is not a recording disc, the pickup 3 is moved to the UTOC area as it is to read the UTOC (S12).
At this time, the pickup 3 is moved and detected by the kick means 8b and the search means 8c.

  The above shows the procedure of position detection in the initial operation. According to the detection means of the disk rotation speed detection means 8d and the predetermined area position determination means 8e, the kick means 8b and the search means 8c, for example, If the pickup 3 suddenly becomes uncontrollable due to vibration, or if the address cannot be detected in the blank area (mirror area) on the outer peripheral part or inner peripheral part of the mini disk 1, the above-mentioned disk rotation is performed. The number detecting means 8d and the predetermined area position determining means 8e can easily return to the area where the address can be read immediately.

  As described above, according to the MD recording / reproducing apparatus 10 of the present embodiment, the position at which the pickup 3 is placed is determined according to the rotational speed of the mini disk 1 by the disk rotational speed detection means 8d and the predetermined area position determination means 8e. Therefore, the position of the pickup 3 can be appropriately detected even if the conventional lead-in switch is eliminated.

  In the present embodiment, the MD recording / reproducing apparatus has been described as an example. However, the present invention is not limited to the mini-disc used in the MD recording / reproducing apparatus, and recording areas such as a lead-in area and a program area are provided. If the recording medium has the recording information reproducing method and the recording information reproducing apparatus according to the present invention, desired recording information can be reliably read.

  In the present embodiment, the recording area is determined by the increase / decrease of the rotational speed of the mini-disc 1 as the predetermined area position determination means. However, as a modification, the recording medium detected as the predetermined area position determination means May be determined based on the result of comparing the number of rotations and the reference number of rotations of a predetermined recording area. The apparatus configuration can be realized by the same configuration as the above-described embodiment.

1 is a block diagram showing a configuration of an MD recording / reproducing apparatus as a disk reproducing apparatus according to an embodiment of the present invention. 3 is a flowchart of an initial operation of the disc playback apparatus. It is a block diagram which shows the structure of the conventional MD recording / reproducing apparatus. It is a flowchart of the initial operation | movement of the conventional MD recording / reproducing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mini disk 2 Spindle motor 3 Pickup 4 Feed motor 5 Driver circuit 6 RF amplifier 7 DSP
8 Microcomputer 8a Tracking control means 8b Kick means 8c Search means 8d Disk rotational speed detection means 8e Predetermined area position determination means 10 MD recording / reproducing apparatus

Claims (10)

A recording medium having a plurality of pieces of information recorded in the recording area is rotated, and the recording information is detected at a rotation speed corresponding to each recording area set in advance by the recording information detecting means, and a predetermined recording is performed from the predetermined recording area. In a recorded information reproducing method for detecting information, converting it into an electric signal corresponding to the recorded information and reproducing it,
The recording information detecting means is moved to detect the number of rotations of the recording medium corresponding to the recording area at the moved position, and whether or not the recording information detecting means is located in a predetermined recording area based on the detection result. A method for reproducing recorded information, characterized in that:   2. The recorded information reproducing method according to claim 1, wherein the determination as to whether or not the recording information detecting means is located in a predetermined recording area is made by determining whether the detected number of rotations of the recording medium is increased or decreased.   Whether or not the recording information detecting means is located in a predetermined recording area is determined based on a result of comparing the detected rotational speed of the recording medium and a reference rotational speed of the predetermined recording area. The recorded information reproducing method according to claim 1.   The recording area includes a lead-in area having a pit signal portion in which information relating to the recording medium is recorded, a groove signal portion in which main information is recorded, and a wobble in which address information corresponding to the position of the recorded information is recorded. 4. The recorded information reproducing method according to claim 1, wherein a program area having a signal portion is formed. A predetermined recording area, comprising: rotating means for rotating a recording medium having a plurality of pieces of information recorded in the recording area; and recording information detecting means for detecting the recording information at a rotation speed corresponding to each preset recording area. In a recording information reproducing apparatus for detecting predetermined recording information and converting it into an electric signal corresponding to the recording information and reproducing it,
Recording medium rotation speed detecting means for detecting the rotation speed of the recording medium;
A recorded information reproducing apparatus comprising: a predetermined area position determining means for determining whether or not the information detecting means is located in a predetermined recording area based on a detection result of the recording medium rotation speed detecting means.   6. The recorded information reproducing apparatus according to claim 5, wherein the predetermined area position determining means is determined based on an increase / decrease in the rotation speed of the recording medium detected by the recording medium rotation speed detecting means.   6. The predetermined area position discriminating means discriminates based on a result of comparing the rotation speed of the recording medium detected by the recording medium rotation speed detecting means with a reference rotation speed of the predetermined recording area. The recorded information reproducing apparatus described.   In the recording area, a track on which information is recorded is formed on the surface, a lead-in area having a pit signal part in which information on the recording medium is recorded, a groove signal part in which main information is recorded, and the main information 8. The recorded information reproducing apparatus according to claim 5, wherein a program area having a wobble signal portion in which address information corresponding to a position is recorded is formed.   The recorded information reproducing apparatus includes, as the recorded information detection means, a pickup that converts the return light of the beam irradiated to the recording medium into an electrical signal corresponding to a pit signal, a groove signal, and a wobble signal, and outputs the electrical signal. Tracking control means for following a track from a tracking error signal from the pickup, kick means for jumping over the track by the tracking control means, and search means for reproducing information recorded by following the track The recorded information reproducing apparatus according to claim 8. In the recording medium, a blank portion in which no information is recorded is formed on the inner side toward the rotation center direction from a recording area in which a track on which information is recorded is formed,
10. The recorded information reproducing apparatus according to claim 9, further comprising pickup movement control means for restricting movement of the pickup into the blank portion.

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