JP2001135013A - Method and device for detecting disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for detecting a disk by which the presence of the disk is accurately recognized even when a large scratch and a black dot, etc., exist on the disk in the case of detecting the disk. SOLUTION: In the disk detection method for irradiating a disk arranged place where the disk 6 is attachable/ detachable freely with light beam, receiving a reflection beam with a pickup 5 and judging the presence of the disk 6 based on the signal level of the reflection beam, the presence detective operation of the disk 6 is performed while executing the disk rotational operation simultaneously with moving the pickup 2. Thus, when the presence of the disk is detected, the scan locus of the pickup 2 becomes large distance and area across the rotational peripheral direction also, not only the radial direction of the disk arranged place, and even when the large scratch and the black dot, etc., exist on the disk, the presence of the disk is recognized accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk detecting method and a disk detecting apparatus for detecting the presence or absence of a disk as an information recording medium.

[0002]

2. Description of the Related Art A disc as an information recording medium is a CD.
A conventional disk detection method will be described by taking a CD device (compact disk) as an example. The configuration of a general CD device is as shown in FIG. 4, reference numeral 1 denotes a spindle motor, 2 denotes a pickup, 3 denotes a thread motor, 4 denotes a servo LSI, 5 denotes a microcomputer (hereinafter, referred to as a microcomputer), and 6 denotes a disk (CD) as an information recording medium. Although not shown, light irradiating means for irradiating light to the disk arrangement location is also provided.

The control operation of a CD device having the above components will be described below. In this CD device, as shown in FIG. 4, the pickup 2 uses a focus drive signal (hereinafter referred to as F
OD signal), tracking drive signal (hereinafter, referred to as OD signal)
The position is adjusted by a TRD signal or a sled motor drive signal (hereinafter, referred to as a TVD signal) to read information from the disk 6 and convert it into an electric signal. The spindle motor 1 is a servo LSI
The rotation of the disk is controlled by a spindle drive signal (hereinafter, referred to as an SPD signal) from the disk drive 4. The sled motor 3 moves the pickup 2 in the radial direction of the disk 6 according to a TVD signal from the servo LSI 4.

[0004] The servo LSI 4 reads an electric signal from the pickup 2 under command control from the microcomputer 5 and performs focus, tracking, spindle,
Performs each servo control of the thread. The microcomputer 5 controls the servo LSI 4 based on the status from the servo LSI 4. For example, as a method of determining the presence / absence of the disk 6 with such a configuration, a configuration in which the determination is made based on the signal level of the reflected light received by the pickup 2 is already known. In this case, a method of outputting a triangular wave as a FOD signal from the servo LSI 4 to the pickup 2 and determining the presence or absence of the disk 6 based on the level of a focus error signal (hereinafter, referred to as an FE signal) from the pickup 2 is performed. I have.

Further, a method has been proposed in which the pickup 2 is moved to change the disk detection position and the disk is detected again, assuming that the disk 6 is erroneously determined to be no disk due to scratches on the disk 6, black dots, or the like. I have. FIG. 5 shows a flowchart of the conventional disk detection method. First, in step 201 (S201), the pickup 2 is moved to the inner circumference. Step 202 (S20
In step 2), detection of a limit SW for detecting the innermost position of the pickup 2 is determined. If the limit SW is OFF, the process proceeds to step 201 (S201), and the pickup 2 is moved to the inner circumference again. If the limit SW is ON, the pickup 2 is selected in step 203 (S203).
To stop. Also, the retry counter at the time of disk detection is set to 0, initialization is performed, and step 204 (S
Proceed to step 204) to perform disk detection. Then step 2
At 05 (S205), the presence or absence of the disk 6 is determined.

If there is a disc, step 211 (S
Proceeding to 211), the existence of the disk is determined. If there is no disk, the process proceeds to step 206 (S206), and if the number of retries is 5 or more, the process proceeds to step 212 (S212), assuming that the disk is undetermined. If the number of retries is less than 5, the process proceeds to step 207 (S207), and the number of retries is incremented by one. However, the number of retries is a reference example only.

Next, in step 208 (S208), the pickup 2 is moved to the outer periphery, and in step 209 (S2
In 09), it is monitored whether a certain time has elapsed. After a lapse of time, the process proceeds to step 210 (S210), the pickup 2 is stopped, the process again proceeds to step 204 (S204), and disc detection is repeatedly performed.

[0008]

However, even in the above-mentioned conventional disk detection method, if the disk 6 has a large scratch or a black dot, the disk 2 is moved again only by moving the pickup 2 in the radial direction. There is a possibility of misrecognition as nothing. In addition, if the pickup 2 is moved largely in the outer peripheral direction, it can be shifted from a position where a large scratch, a black dot or the like is present, and the possibility of erroneously recognizing that there is no disk can be reduced. In such a case, the TOC (Table Of Con
(tents) area, so that it takes extra time to access the disc.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. When detecting a disk, even if the disk has a large scratch or a black dot, the presence or absence of the disk can be accurately recognized. It is an object of the present invention to provide a disk detection method and a disk detection device that can prevent an extra access time until the disk is detected.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention irradiates a light to a place where a disk is detachably mounted, receives reflected light by a pickup, and outputs a signal of the reflected light. This is a disk detection method for determining the presence / absence of a disk based on a level, wherein the operation of detecting the presence / absence of a disk is performed while moving a pickup and simultaneously performing a disk rotation operation.

According to this method, when a disk is detected, even if the disk has large scratches or black dots, the presence or absence of the disk can be accurately recognized.
It is possible to minimize the time required to access the disk until it is reproduced.

[0012]

According to the first aspect of the present invention, light is radiated to a disk arrangement portion where a disk is detachable, a reflected light is received by a pickup, and the disk is reflected on the basis of a signal level of the reflected light. This is a disk detection method for determining the presence or absence of a disk, in which a disk presence / absence detection operation is performed while moving a pickup and simultaneously performing a disk rotation operation.

According to a third aspect of the present invention, there is provided a disk detecting device, comprising: a disk rotation driving means; a light irradiating means for irradiating light to a disk arrangement portion where the disk is detachable; and a reflected light from the disk. A pickup for receiving light,
Pickup driving means for moving the pickup along a predetermined direction, determination means for determining the presence or absence of a disk based on the signal level of the reflected light detected by the pickup,
When receiving the reflected light by the pickup in response to an instruction for the presence / absence detection operation of the disk, the pickup is moved and the disk rotation driving means is simultaneously driven.

According to this method and configuration, in performing the operation of detecting the presence or absence of a disk, not only the movement of the pickup but also the rotation operation of the disk are performed. However, the distance and the area are also large in the rotating circumferential direction, and even if the disk has a large scratch or a black dot, the presence or absence of the disk can be accurately recognized. In addition, as a result, it is not necessary to perform an operation of moving the pickup largely in the outer peripheral direction, so that the pickup does not largely move away from the TOC region,
The access time until the disc is reproduced can be reduced in a short time without taking extra time.

According to a second or fourth aspect of the present invention, in the disk detecting method of the first aspect or the disk detecting apparatus of the third aspect, the moving direction of the pickup at the time of the operation of detecting the presence or absence of the disk is determined. This is a direction along the radial direction. Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a disk detection device for realizing the disk detection method according to the present embodiment. Here, similarly to the case described in the related art, a description will be given of a CD device using a CD as an information recording medium as an example of a disk device. Also, components having the same functions as those of the conventional CD device shown in FIG. 4 are denoted by the same reference numerals, and detailed description thereof will be omitted. Although not shown, light irradiating means for irradiating light to the disk arrangement location is provided similarly to the conventional CD device.

As shown in FIG. 1, the disk detecting device has a configuration in which a microcomputer (microcomputer) 5 as a control means is provided with a recording medium 7 in which a program for realizing a disk detecting method described below is recorded. . As a method for determining the presence or absence of the disk 6, the microcomputer 5 employs a configuration in which the determination is made based on the signal level of the reflected light received by the pickup 2, outputs a FOD signal from the servo LSI 4 to the pickup 2, and outputs a triangular wave. The presence or absence of the disk 6 is determined based on the level of the FE signal.

If it is determined that there is no disk, the spindle motor 1 serving as a rotation driving means is driven at the same time as the movement of the pickup 2 by the program of the microcomputer 5 to rotate the disk 6. Move the disc detection position
By shifting in a short time, erroneous determination of the presence / absence of a disk is avoided.

Here, the present invention and a conventional disk detection method will be described with reference to FIG. In FIG. 2, point A is the start position of the disk detection of the pickup 2, point B is the movement position of the pickup 2 according to the conventional disk detection method in which only the sled movement is performed, and point C is the disk detection of the present invention in which the sled movement and the spindle rotation are performed. The moving position of the pickup 2 according to the method.

In the conventional disk detection method, the starting position A
When the disk detection position is changed from the point, the disk is moved to the point B along the radial direction of the disk by the sled movement. In the present invention, the spindle motor 1 is driven simultaneously with the radial movement by the sled movement. The disk 6 is rotated to move the disk detection position to the point C.

In the above disk detecting device,
The control processing of the disk detection method by the microcomputer 5 will be described with reference to the flowchart shown in FIG. Step 101 (S101) to Step 107
Until (S107), step 201 of the conventional example of FIG.
This is the same as (S201) to step 207 (S207).

First, in step 101 (S101), the pickup 2 is moved to the inner circumference. Step 102 (S1
In 02), the detection and determination of the limit SW for detecting that the pickup 2 has reached the innermost position is performed. Limit SW
If it is OFF, the process proceeds to step 101 (S101), and the pickup 2 is moved to the inner circumference again. If the limit SW is ON, the pickup 2 is stopped in step 103 (S103). Further, the retry counter at the time of disk detection is set to 0 and initialization is performed.

In step 104 (S104), a disk is detected. Next, in step 105 (S105), the presence or absence of the disk 6 is determined. If you have a disc, step 1
Proceeding to 11 (S111), the presence of the disk is determined. If there is no disc, the process proceeds to step 106 (S106),
If the number of retries is 5 or more, it is determined that the disk is undetermined, and the process proceeds to step 112 (S112). If the number of retries is less than 5, the process proceeds to step 107 (S107) and the number of retries is incremented by one.

Next, in step 108 (S108), the pickup 2 is moved to the outer periphery, and at the same time, the rotation of the spindle motor 1 is accelerated to rotate the disk 6. In step 109 (S109), it is monitored whether a certain time has elapsed. After a lapse of time, the process proceeds to step 110 (S110) to stop the pickup. At the same time, the spindle motor 1 is stopped. Again, step 104 (S
Proceeding to 104), the disk detection is repeated.

As described above, by performing not only the movement of the pickup 2 but also the rotation of the disk 6 when the presence / absence detection operation of the disk 6 is performed, as shown in FIG. Is a large distance and area not only in the radial direction but also in the circumferential direction of the disk arrangement location, so that even if the disk 6 has a large scratch or black dot, the presence or absence of the disk 6 can be accurately recognized. . In addition, as a result, since it is not necessary to perform an operation of moving the pickup 2 largely in the outer peripheral direction, the access time until the reproduction of the disc is not increased by that much, and the access time can be shortened. Also, when the presence / absence detection operation of the disk 6 is performed, the spindle motor 1
Since only the drive control is added, the control method for each component can be easily controlled without greatly changing the configuration of the conventional software control, and the increase in manufacturing cost is minimized. Can be suppressed.

Although the above embodiment has been described by taking a CD device as an example, it is needless to say that the present invention can be applied to a device that handles other disks. Further, the number of retries in the operation for detecting the presence / absence of the disk 6 is not limited to five.

[0026]

As described above, according to the present invention, by moving the disk detection position while rotating the disk simultaneously with the pickup movement, it is possible to avoid erroneous determination of disk detection and improve reliability. Can be done.
In addition, since it is not necessary to perform an operation of moving the pickup largely in the outer peripheral direction, the access time until the reproduction of the disc is not increased by that much, and the time can be shortened.

Furthermore, since the control can be easily performed without largely changing the configuration of the conventional software control, an increase in manufacturing cost can be suppressed to a minimum.

[Brief description of the drawings]

FIG. 1 is a block diagram related to a control system of a disk detection device (CD device) according to an embodiment of the present invention;

FIG. 2 is a diagram conceptually showing each movement state of a pickup between a disk detection method according to the present invention and a conventional disk detection method.

FIG. 3 is a flowchart of a disk detection method according to the present invention.

FIG. 4 is a block diagram related to a control system of a conventional disk detection device (CD device).

FIG. 5 is a flowchart of a conventional disk detection method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle motor (disk rotation drive means) 2 Pickup 3 Thread motor (pickup drive means) 4 Servo LSI 5 Microcomputer (control means) 6 Disk 7 Recording medium

Claims (4)

[Claims] 1. A disc detecting method for irradiating a light to a disc arrangement portion where a disc is detachable, receiving reflected light by a pickup, and judging the presence or absence of the disc based on a signal level of the reflected light. A disk detecting method for performing a disk presence / absence detection operation while moving a pickup and simultaneously performing a disk rotation operation. 2. The disk detecting method according to claim 1, wherein the moving direction of the pickup during the operation of detecting the presence or absence of the disk is a direction along a radial direction of the disk. 3. A rotation driving means for a disk, a light irradiating means for irradiating light to a disk arrangement portion where the disk is detachable, a pickup for receiving reflected light from the disk, and a pickup along a predetermined direction. Pick-up drive means for moving the disc, determining means for judging the presence or absence of the disc based on the signal level of the reflected light detected by the pickup, and when receiving the reflected light with the pickup when there is an instruction of the disc presence detection operation, And a control means for driving the disk rotation driving means at the same time as moving the pickup. 4. The disk detecting device according to claim 3, wherein the moving direction of the pickup during the operation of detecting the presence or absence of the disk is a direction along the radial direction of the disk.