JP2004164743A - Information recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable stably to record and reproduce information on a recording medium of a specific shape without adding a redundant detecting means, and to prevent large sound by restricting recording and reproducing speed. <P>SOLUTION: An information recording and reproducing device 25 provided with a means performing recording information and reproducing or erasing the recorded information is provided with a specific shape discriminating means discriminating a recording medium in which an information recording and reproducing region is formed on a whole region of a recording plane in a concentric state and a recording medium of a specific shape divided into at least two regions with a discontinuous area in an information recording and reproducing area. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an information recording / reproducing apparatus used as a peripheral device of a computer and capable of detecting a specially shaped disk.
[0002]
[Prior art]
With the spread of multimedia, various information reproducing apparatuses for reproducing information recorded on a recording medium have been put into practical use. For example, a disk reproducing device for reproducing a music CD (Compact Disk) as a recording medium in the form of a disk, a disk reproducing device for reproducing data recorded on a CD-ROM for a personal computer (hereinafter referred to as a "PC"), a DVD There is a DVD player that plays back moving images recorded in video. In recent years, a write-once optical disk using a dye-based medium, a rewritable MO (Magneto Optical) disk using a magneto-optical medium, a phase change medium, and the like have attracted attention. In addition, a DVD (Digital Versatile Disk) -ROM, DVD-R (Recordable), DVD-RAM has been developed by shortening the wavelength of a semiconductor laser as a laser light source, reducing the spot diameter by a high NA objective lens, and adopting a thin base. Large-capacity disks such as DVD-RWs (Rewritable) have been put to practical use.
[0003]
On the other hand, the above-mentioned various recording media (also referred to as media) generally have a circular shape, but some media having a non-concentric shape have been put to practical use. For example, as such a recording medium, a discontinuous area exists in a concentrically formed area for recording and reproducing information, such as a business card disk, and the area is divided by at least one set of parallel lines. Optical disks formed in a special shape have been put to practical use.
As a conventional technique relating to a recording medium formed in such a special shape, there is a technique relating to a method of accessing a recording medium of a rotary reading type provided with a disk type storage unit whose shape is regulated, such as a CD card, and a method of combining data. (For example, see Patent Document 1). This is as follows. When reading information, the CD card 10 rotates about the rotation axis, and the data on the track is read by receiving the reflected light of the laser beam emitted from the reading unit 25. However, the CD card 10 is non-circular, and the cut ( Since there is a non-track part), the non-track detecting unit 22 detects this break and skips it. The non-track detecting section 22 is configured such that a light emitting section 22A is provided above the CD card 10 and a light receiving section 22B is provided below the CD card 10, and light emitted from the light emitting section 22A is received by the light receiving section 22B. The presence or absence of a track is detected by the presence or absence of light reception.
[0004]
Further, there is the following technique for enabling the disc size to be properly determined (for example, see Patent Document 2). This is as follows. The disk physical information is read from the optical disk on which the disk physical information is recorded on the disk surface of the optical disk while rotating the optical disk at a standard rotation speed, and the optical disk is determined based on the disk physical information. Then, the speed is limited when rotating at a high speed according to the determined optical disc. Disc size is determined by using disc physical information recorded on the disc or by measuring the disk's inertia and disc light reflectance, and the disc rotation speed is set to an appropriate value based on the discrimination output. Control is performed as follows. Double-density optical disks such as CD-ROMs and CD-Rs, and optical disks having a standard diameter (12 cm), optical disks having a smaller diameter (8 cm) or rectangular optical disks, as well as DVDs When a variety of optical disks such as an optical disk are mounted on a device, the diameter and shape of the mounted optical disk are accurately determined.
[0005]
[Patent Document 1]
JP 2001-351237 A (page 1)
[Patent Document 2]
JP-A-2002-117613 (page 1)
[0006]
[Problems to be solved by the invention]
However, when an information reproducing apparatus rotates an optical disk having a special shape that is not concentric as described above at a high speed, the optical disk often rotates while generating extremely loud sound, and the servo is extremely unstable and stable information is recorded. In many cases, playback or playback is not possible.
In this regard, for example, as described in Japanese Patent Application Laid-Open No. 2001-351237 described above, a light emitting and light receiving element for detecting a recording medium having a special shape is arranged at a specific position, and the special shape is determined based on the detection result. There is a technique of detecting a recording medium having a. However, this is not appropriate because an element having a redundant shape is required to detect a recording medium having a special shape.
In addition, for example, as described in JP-A-2002-117613 described above, it is possible to limit the speed for recording and reproduction based on the capacity and type of the disk. However, according to this conventional technique, it is not possible to limit the recording / reproducing speed based on the detection result of an optical disk having a special shape such as a business card disk or the type of the optical disk. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In an information recording / reproducing apparatus for recording / reproducing information on / from a recording medium such as an optical disk, the information recording / reproducing apparatus does not need to add redundant detection means, and can provide a It is an object of the present invention to enable stable recording and reproduction of information even in a recording medium having a complicated shape, and to eliminate generation of a loud sound.
[0007]
[Means for Solving the Problems]
The present invention provides an information recording / reproducing apparatus comprising means for recording information on a recording medium, reproducing or erasing the recorded information, and an information recording / reproducing area over the entire recording surface. Is a concentric recording medium, and a special shape discriminating between a specially shaped recording medium in which a discontinuous area exists in the information recording / reproducing area and the information recording / reproducing area is divided into at least two areas. It is characterized in that a determination means is provided.
The information recording / reproducing device is configured to perform at least one of recording information on the recording medium and reproducing or erasing the recorded information when the special shape determining unit determines that the recording medium has a special shape. May be provided.
The special shape determining means may determine whether the recording medium has a special shape based on the presence or absence of a focus servo signal on servo at a position where the objective lens is moved in the radial direction of the recording medium.
Further, there is provided means for judging whether or not the recording medium is an 8 cm size optical disk based on the measurement result of the inertia of the recording medium. When the means is judged to be an 8 cm size optical disk, the special shape discrimination is performed. The means may be activated.
The special shape determining means may determine the special shape recording medium assuming that the discontinuous region is formed at a position of 3 to 4 cm from the center hole of the special shape recording medium.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing an example of the internal configuration of the information recording / reproducing device 25 according to the present invention. The information recording / reproducing device 25 has a configuration capable of recording, reproducing, and erasing information on the optical disc 1, and has an internal configuration as shown in FIG. The information recording / reproducing device 25 includes a spindle motor 2, a motor driver 3, a servo means 4, an optical pickup 5, a read amplifier 6, a CD decoder 7, a CD-ROM decoder 8, a buffer manager 9, And a buffer RAM 10. The information recording / reproducing device 25 includes an ATAPI / SCSI interface (I / F) 11, a D / A converter 12, an ATIP decoder 13, a CD encoder 14, a CD-ROM encoder 15, a laser control circuit 16, , A microcomputer 20.
The spindle motor 2 operates as a rotation drive unit and drives the optical disc 1 to rotate. The motor driver 3 operates the spindle motor 2, and the servo unit 4 controls the rotation of the optical disc 1 by the spindle motor 2 so that the linear velocity (CLV) or the rotation speed (CAV) is constant. 5 is controlled. The linear velocity can be changed stepwise.
[0009]
The optical pickup 5 incorporates a semiconductor laser as a light source (not shown), an optical system, a focusing actuator, a tracking actuator, a light receiver, a position sensor, and the like, and irradiates a recording surface of the optical disc 1 with laser light. The optical pickup 5 is configured to be movable in a sledge direction (disc radial direction) by a seek motor (not shown). These focusing actuators, tracking actuators, and seek motors receive signals obtained from a light receiver and a position sensor, and are driven by a motor driver 3 and a servo unit 4 so that a laser beam is positioned at a target position on the optical disc 1. Control the irradiation position of the spot.
The read amplifier 6 amplifies and binarizes the reproduction signal obtained by the optical pickup 5, and inputs the binarized data to the CD decoder 7. The CD decoder 7 performs deinterleaving and error correction processing of an input signal at the time of data reproduction, and inputs the data after the deinterleaving and error correction processing to the CD-ROM decoder 8. The CD-ROM decoder 8 performs an error correction process on the input data to improve data reliability. The buffer manager 9 causes the data processed by the CD-ROM decoder 8 to accumulate in the buffer RAM 10 at the time of information reproduction, and accumulates the data transferred from the host computer (not shown) in the buffer RAM 10 at the time of information recording. The ATAPI (attachment packet interface) / SCSI interface (I / F) 11 transfers the data processed by the CD-ROM decoder 8 as data (sector data) in units of sectors to a host computer (not shown) at once. An interface for receiving data to be recorded on the optical disc 1 from a host computer.
[0010]
The D / A converter 12 receives the music data output from the CD decoder 7 and extracts an analog audio signal.
The ATIP decoder 13 extracts information of an Absolute Time in Pre-Groove (ATIP) signal, detects an ATIP error, and measures a detection error rate of the ATIP signal. The ATIP signal is time information indicating an absolute address on the optical disc 1, and a certain amount of data is accumulated in the buffer RAM 10, and a write start point when a laser spot is positioned before recording of the data is obtained. This is a wobble signal that has been engraved on the optical disc 1 in advance by meandering tracks (pre-grooves). The CD encoder 14 is a means for inputting a synchronization signal generated by the ATIP decoder 13 and enabling writing of data at an accurate position. The CD encoder 14 and the CD-ROM encoder 15 add an error correction code or interleave the data stored in the buffer RAM 10 and input the data to a laser control circuit 16 as light source drive control means. The data is recorded on the optical disk 1 via the optical pickup 5. The microcomputer 20 is a unit for controlling the operation of each component described above, and includes a CPU 17, a ROM 18, and a RAM 19. The CPU 17 is a central processing unit (LSI) that controls the operation of the entire information recording / reproducing device 25. The ROM 18 stores a program for executing an operation characteristic of the present invention by the processing of the CPU 17, and the RAM 19 stores data processed by the CPU 17, and the like.
[0011]
Next, the function of the information recording / reproducing apparatus 25 having the above configuration will be described with reference to the flowcharts shown in FIGS. In FIGS. 3 to 6, S stands for a step.
First, the function of the information recording / reproducing device 25 according to the first embodiment will be described. The invention according to claim 1 is characterized in that a special shape of an optical disk is determined in a disk mounting process when the optical disk 1 is inserted into the information recording / reproducing device 25.
FIG. 3 is a flowchart showing a processing procedure at the time of mounting the disc including the special shape discrimination processing of the optical disc. When the optical disc 1 is mounted, the information recording / reproducing apparatus 25 causes the CPU 17 to start the process and proceed to step 1 to initialize the inside of the CPU 17 and initialize various variables such as servo signals. Then, the size of the optical disc 1 is determined from the measurement result. In this case, the size of the optical disc 1 is determined by its size (for example, 12 cm for large and 8 cm for small). In step 3, the CPU 17 operates as a special shape discriminating means, and executes a special shape discrimination process of the optical disc for discriminating whether the shape of the optical disc 1 is a special shape or a normal shape.
[0012]
The optical disk 1 to be determined in step 3 is, for example, as shown in FIG. FIG. 2 is a plan view showing an optical disk having a normal shape and an optical disk having a special shape. (In each optical disk, an area (information recording / reproducing area) 21 in which information can be recorded, reproduced, and erased has a circular shape. However, in FIG. 2, for convenience of illustration, the information recording / reproducing area 21 is shown as an elliptical shape which is crushed up and down.) Here, (a) shows an optical disc 1a of a normal shape in which an information recording / reproducing area 21 is formed concentrically over the entire recording surface, and (b) shows a discontinuous area ( Non-track portions (so-called cuts) 21a, 21a are present, and the optical disk 1b is formed in a special shape in which the concentric information recording / reproducing area 21 is divided by a set of parallel lines A, A. .
In step 4 following step 3, the type of the optical disc 1 is determined based on the measurement result of the reflectance. Here, the type of the optical disk 1 is determined based on the magnitude of the reflectivity (CD-ROM or CD-R if large, CD-RW if small). Then, the process proceeds to step 5, where the optimum servo conditions are set based on the conditions set in the previous steps to adjust the servo signals. Then, proceeding to step 6, the information recorded on the optical disk 1 is read after the on-servo operation, and the processing at the time of mounting the disk is ended.
[0013]
Conventional information recording / reproducing devices determine the type of optical disk to be mounted based on information recorded on the optical disk after on-servo by setting optimal servo conditions based on the size and type of the optical disk. In the discrimination, the optimal servo condition was not always set for an optical disk having a special shape without considering the difference in shape. However, as described above, when mounting the optical disc 1, the information recording / reproducing apparatus 25 according to the present invention determines whether the optical disc 1 has a special shape or a normal shape, and determines the optimum servo condition in consideration of the discrimination result. The settings are made. Thus, not only when the optical disc 1 has a normal shape but also when the optical disc 1 has a special shape, the optimal servo conditions are set, and the information recorded on the optical disc 1 is read after the on-servo operation. In this aspect, it is possible to determine the shape of the optical disc that is not suitable for high-speed rotation, and it is possible to record and reproduce information stably.
[0014]
Next, the function of the information recording / reproducing apparatus 25 according to the second aspect of the present invention will be described. According to the second aspect of the present invention, in the disc mounting process when the optical disc 1 is inserted into the information recording / reproducing device 25, a special shape of the optical disc is determined, and information recording, reproduction, or reproduction of information on the optical disc 1 is performed according to the result. It is characterized in that the speed at which at least one of the erasures is performed (information recording / reproducing speed) is limited. FIG. 4 is a flowchart showing another processing procedure at the time of mounting the disc including the special shape determination processing of the optical disc. This flowchart is different from the flowchart shown in FIG. 3 in that steps 7 and 8 are provided between steps 3 and 4, and the other points are common. Therefore, the following description will focus on the differences. Explanation of common points is omitted or simplified.
In the information recording / reproducing apparatus 25, when the optical disk 1 is mounted, the CPU 17 starts the processing, proceeds to step 1, sequentially executes steps 2 and 3, and then proceeds to step 7. In step 7, it is determined whether or not the optical disc 1 has a normal shape (normal) based on the result of the special shape discrimination process of the optical disc 1 in step 3, and if it is a normal shape, the process proceeds to step 4; The processing is executed in the same manner as in the flowchart shown in FIG. In step 8, the CPU 17 outputs an instruction to limit the information recording / reproducing speed on the optical disc 1 (for example, 8 times or less), and proceeds to step 4, in which the CPU 17 executes the same processing as the flowchart shown in FIG. . This makes it possible to minimize noise, vibration, and the like caused by rotating the optical disk 1 having the special shape at the highest speed.
[0015]
Next, the function of the information recording / reproducing device 25 according to the third aspect of the present invention will be described. The invention according to claim 3 is characterized by specific contents of the above-described special shape determination processing of the optical disk.
FIG. 5 is a flowchart illustrating the procedure of the special shape determination process of the optical disc. When the special shape determination process of the optical disc is started, the process proceeds to step 31, and in determining the special shape, the CPU 17 determines whether the position of the objective lens of the optical pickup 5 with respect to the optical disc 1 is relatively known. . In this embodiment, the determination is made based on whether or not the objective lens is at a predetermined position (for example, the HOME position). If the position of the objective lens is relatively known, that is, if the objective lens is at the predetermined position, the process proceeds to step 33. If the objective lens is not at the predetermined position, the process proceeds to step 32, executes step 32, and proceeds to step 33. In step 32, the objective lens is once moved to a predetermined position (for example, a HOME position). When the objective lens is found to be at the predetermined position in this way, the process proceeds to step 33, and the objective lens is moved a predetermined distance therefrom in consideration of the discontinuous region (for example, a moving distance X from the center of a hole 1c described later). Is set to several cm) in the radial direction. Then, the process proceeds to a step 34, wherein it is checked whether or not the focus servo signal at the position after the movement of the objective lens in the step 33 is on-servo without any problem. If the focus servo signal is in the on-servo state without any problem (there is on-servo), the process proceeds to step 35, where it is determined that the optical disc 1 is a normal optical disc as an area where the data of the optical disc 1 is continuous. To end the processing. If the focus servo signal is off-servo (no on-servo), the process proceeds to step 36, where it is determined that the optical disc 1 has a special shape, and the process ends. In this manner, it is possible to reliably discriminate an optical disk formed in a special shape from a normal optical disk having a concentric shape.
[0016]
Next, the function of the information recording / reproducing device 25 according to the invention of claim 4 will be described with reference to the flowchart shown in FIG. FIG. 6 is a flowchart showing another processing procedure at the time of mounting the disc including the special shape discrimination processing of the optical disc. This flowchart is different from the flowchart shown in FIG. 4 in that step 9 is provided between steps 2 and 3, and the other points are common. Therefore, the following description will focus on the difference. Description of common points is omitted or simplified.
In the information recording / reproducing device 25, when the optical disk 1 is mounted, the CPU 17 starts the processing, proceeds to step 1, executes step 2, and proceeds to step 9. In step 9, it is determined whether or not the type of the optical disk 1 is an optical disk of 8 cm size from the measurement result of the inertia in step 2, and if it is determined that the optical disk 1 is of 8 cm size, the process proceeds to step 3 and shown in FIG. Similar to the flowchart, steps 7, 8, 4, 5, and 6 are sequentially executed, and the process ends. When it is not determined that the optical disk is 8 cm in size (when it is determined that the optical disk is 12 cm in size), the process proceeds to step 4 to measure the reflectance, and steps 3, 7, and 8 are performed, and the same as the flowchart shown in FIG. Steps 4, 5, and 6 are sequentially executed, and the process ends. In this case, the special shape discrimination processing of the optical disc 1 is performed only when it is determined by the inertia measurement that the optical disc is an 8 cm size optical disc. It is possible to make a reliable determination without spending the time required for.
[0017]
Next, the function of the information recording / reproducing device 25 according to the invention of claim 5 will be described. As can be seen from the continuous information recording / reproducing area 21 shown in FIG. 2, in the optical disk 1b having a general card shape and a special shape, the information recording / reproducing area 21 has a radius of 3 cm from the center of the central hole 1c. It is set concentrically within the range of about. On the other hand, in a normal concentric optical disc 1a, the information recording / reproducing area 21 is set to have a radius of about 4 cm from the center of the hole 1c.
Considering this point, it is possible to determine the special shape of the optical disc 1 by determining the focus servo signal at a position 3 to 4 cm from the center of the hole 1c. In this case, in the optical disk special shape discriminating process shown in FIG. 5, the moving distance X in step 33 may be set to about 3.5 cm. Since the discontinuous area 21a of the optical disk of a special shape exists at a position of 3 to 4 cm from the center of the hole 1c, by setting the moving distance X to about 3.5 cm, it is possible to cause the disk shake at the time of mounting the optical disk. The special shape of the optical disc can be sufficiently determined even when considering that an error may occur up to about 2 mm. It is to be noted that a data track often does not exist even in an area where data can exist, but even in such a case, since the focus servo can be continuously turned on, the moving distance X is set to 3.5 cm. By arranging the objective lens at the above-mentioned position, the special shape can be determined.
As described above, in the information recording / reproducing apparatus 25 according to the fifth aspect of the present invention, the discontinuous area 21a of the optical disk formed in a special shape is formed at a position having a radius of 30 mm to 40 mm from the center of the hole 1c of the optical disk 1. Therefore, since the recording medium having the special shape is determined, it is possible to reliably determine the normal concentric optical disk from the optical disk having the special shape, for example, a business card type optical disk without mistake.
[0018]
【The invention's effect】
As described above, the information recording / reproducing apparatus according to the present invention can determine the shape of an optical disc that is not suitable for high-speed rotation in terms of noise and vibration, and can record and reproduce information stably. It is.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an example of an internal configuration of an information recording / reproducing apparatus according to the present invention.
FIG. 2 is a plan view showing an optical disk having a normal shape and an optical disk having a special shape.
FIG. 3 is a flowchart showing a processing procedure at the time of mounting the disc including a special shape discrimination process of the optical disc.
FIG. 4 is a flowchart showing another processing procedure at the time of mounting the disc, including a special shape discriminating process of the optical disc.
FIG. 5 is a flowchart illustrating a procedure of a special shape determination process of the optical disc.
FIG. 6 is a flowchart showing another processing procedure at the time of mounting the disc, including a special shape discriminating process of the optical disc.
[Explanation of symbols]
1: optical disc 2: spindle motor 3: motor driver 4: servo means 5: optical pickup 6: read amplifier 7: CD decoder 8: CD-ROM decoder 9: buffer manager 10: buffer RAM
11: ATAPI / SCSII / F
12: D / A converter 13: ATIP decoder 14: CD encoder 15: CD-ROM encoder 16: laser control circuit 17: CPU
18: ROM 19: RAM
20: microcomputer 25: information recording / reproducing device

Claims (5)

Recording information on a recording medium, an information recording and reproducing apparatus comprising means for reproducing or erasing the recorded information,
A recording medium in which an information recording / reproducing area is formed concentrically over the entire recording surface, and a special shape in which a discontinuous area exists in the information recording / reproducing area and the information recording / reproducing area is divided into at least two areas. An information recording / reproducing apparatus comprising a special shape discriminating means for discriminating a recording medium. The information recording / reproducing apparatus according to claim 1,
When the special shape discriminating unit determines that the recording medium has a special shape, a unit is provided for limiting a speed of recording at least one of information on the recording medium and reproducing or erasing the recorded information. An information recording / reproducing apparatus characterized in that: 2. The method according to claim 1, wherein the special shape determining unit determines whether the recording medium has a special shape based on the presence or absence of on-servo of a focus servo signal at a position where the objective lens is moved in a radial direction of the recording medium. Or the information recording / reproducing apparatus according to 2. The information recording / reproducing apparatus according to any one of claims 1 to 3,
Means for determining whether or not the recording medium is an optical disk of 8 cm size based on a measurement result of inertia of the recording medium;
The information recording / reproducing apparatus according to claim 1, wherein said special shape discriminating means operates when said means judges that the disc is an 8 cm size optical disc. The special shape discriminating means discriminates the special shape recording medium on the assumption that the discontinuous region is formed at a position of 3 to 4 cm from the center hole of the special shape recording medium. Item 5. The information recording / reproducing device according to item 3 or 4.

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