JP3016882U - Optical disc player - Google Patents

Abstract

(57) [Summary] [Object] To provide an optical disk reproducing apparatus capable of surely determining the size of a mounted disk to be reproduced and shortening the time required for a search operation. [Structure] After determining the mounted disk size based on the acceleration detected when the rotational speed of the mounted disk is changed, the mounted disk size determination obtained from the TOC section read result is further performed. When it is indicated that the disc is a disc of a specific type, the determination result is prioritized, and when the determination result of the disc size is not the disc of the specific type, the disc size determination result based on the acceleration. It is an optical disc reproducing apparatus equipped with a mounted disc size recognition means for certifying the mounted disc size type.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to, for example, an optical disk reproducing apparatus that realizes a high speed search operation of a target track.

[0002]

[Prior art]

 In general, there are two types of optical discs, one in which the disc is controlled and driven at a constant rotational speed, and the other in which the linear velocity on the track is constant (CLV) like CD-ROM and compact discs. In optical discs such as CD-ROMs and compact discs that are controlled at a constant linear velocity, the disc rotation speed changes depending on the position (radial position) from the center of the track to be played. An optical pickup is used to read information stored on such a CLV type optical disc. This optical pickup irradiates a recording track of a CLV type optical disc with a spot term, receives the reflected light thereof, and sends a signal to a signal processing unit in a subsequent stage.

In a normal reproducing operation, the optical pickup is moved in the radial direction at a normal speed during reproduction so that the spot light moves along a recording track on a spiral formed on the optical disc. At this time, the spindle motor, which rotates the disc so that the linear velocity is constant, is servo-controlled by a synchronizing signal from the disc, which causes the disc to move according to the radial position of the optical pickup, that is, the track position to be reproduced. The rotation speed of the disc changes, so that the disk rotation speed becomes slower when the track is closer to the outer circumference, and the disk rotation speed becomes faster when the track is closer to the inner circumference.

In such a CLV type optical disc reproducing apparatus, when performing a search operation for rapidly moving the optical pickup to a recording track to be reproduced before reproducing, the optical pickup is first moved to the track of the optical pickup. Move from the position to the track destination at high speed in the radial direction. Next, return the movement of the optical pickup to the normal speed during playback, issue a playback command near the destination of the moved target track, and wait until the Q code that has recorded the absolute time (ATIME) can be read. Accelerate or decelerate the rotation speed.

Here, when the current position is located outside the destination with respect to the disk, the rotation speed at the destination must be slower than the rotation speed at the current position in order to keep the track linear velocity constant. The spindle motor is decelerated accordingly. In this way, if the disc rotation speed is controlled so as to be the predetermined linear velocity according to the target track position, the Q code is read, the absolute time is detected, and the disc speed is determined based on these information. The rotation control, that is, the spindle servo control is turned on, the accurate constant linear velocity control is performed, and the next reproducing operation can be started.

[0006]

[Problems to be solved by the device]

 Since the search operation in the conventional optical disk reproducing apparatus is performed as described above, the optical pickup moves from the current position to the target position, reaches the target position, and then accelerates the spindle motor to the linear velocity at the target position. Decelerate and control. Then, when the predetermined linear velocity is reached, data can be read, the search operation is completed, and playback operation can be started.However, since the optical pickup moves, the spindle motor acceleration or deceleration operation starts. However, the waiting time until the tracking servo is established and the data can be read becomes long. Especially when playing many types of optical discs with different diameters, the waiting time corresponding to the diameter occurs and the waiting time There is a problem that it may become long.

An object of the present invention is to reliably determine the disk size to be reproduced in order to perform a search operation at high speed, and to reduce the waiting time until the tracking servo is established and data can be read. It is to provide an optical disk reproducing device that can perform.

[0008]

An optical disk reproducing apparatus according to the present invention is an optical disk reproducing apparatus for reproducing a recording track in which information pits are spirally recorded by an optical pickup by controlling a constant linear velocity. The size of the mounted disc is determined based on the difference in the amount of change detected when the rotational speed of the mounted disc is accelerated. When a certain TOC (Table Of Contents) section is read and the TOC section read result indicates that the disk is the above-mentioned specific type, it is recognized as a mounted disk of the above-mentioned specific type of disk size, and If the TOC section read result indicates that the disc is not the specific type disc, the loaded disc support Characterized in that it comprises a mounting disk size recognition hand stage of performing mounting disc recognition in accordance with the determination result by's judgment means.

Further, the optical disc reproducing apparatus according to the present invention is characterized in that the disc of the specific type is a 12-session multi-session disc. Further, in the optical disc reproducing apparatus according to the present invention, the mounted disc size determination means applies the acceleration due to the kick pulse when the mounted disc is rotated by the spindle motor for a predetermined time, and from that time the linear velocity constant control is completed. The feature is that the mounted disc size is determined by the time until.

[0010]

[Action]

 The mounted disc size recognizing means of the optical disc reproducing apparatus according to the present invention further obtains the mounted disc size determination result based on the difference in the amount of change detected when the rotational speed of the mounted disc is accelerated, and further, the TOC. When the mounted disc is found to be a disc of a specific type from the result of the TOC portion read, the mounted disc size determination based on the acceleration is ignored and the TOC portion read result is obtained. The mounted disc size is recognized with priority given to the disc size recognition result, and when it is determined from the TOC section read result that the disc is not of a specific type, the mounted disc size determination result based on the acceleration is followed. The size of the mounted disc, and therefore the size of the mounted disc based on the acceleration. By improving the reliability of the result and using the judgment result, it is possible to perform the search operation corresponding to the type of mounted disk (disk diameter, etc.). It is also optimized to prevent the extension of the time required for the search operation due to a disc size error and shorten the time required for the search operation of the target track.

Further, in the mounted disc recognition means of the optical disc reproducing apparatus of the present invention, the disc of the specific type is a 12 cm multi-session disc, and the TOC part read result is a 12 cm multi-session disc. If it is determined that the disc is a 12-centimeter multi-session disc regardless of the loaded disc size determination result based on the acceleration, the reliability of the determination result is improved, and the search operation is performed due to a disc size recognition error. Prevent extension of required time. Further, as a mounted disc size determination means, a kick pulse having a predetermined pulse width is applied to a spindle motor mounted with a mounted disc to accelerate and the time from that time until the constant linear velocity control is completed is measured. A threshold value is set, and if it is longer than a predetermined time, it is determined to be 12 cm disk, and if it is shorter than 8 cm disk.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an optical disk reproducing apparatus according to an embodiment of the present invention. In the present embodiment, an optical disc reproducing apparatus capable of reproducing a magneto-optical disc will be described. In the figure, 1 is a magneto-optical disk, 2 is a recording magnetic head for recording on the magneto-optical disk 1, 3 is a head drive unit for controlling the drive of the recording magnetic head 2, and 4 is address data. An address decoder 5 for decoding is an EFM modulator / CIRC unit which performs EFM modulation on a recorded signal and corrects digital data read from the magneto-optical disk 1. 6 is a seismic resistant memory controller for imparting seismic resistance when writing and reading data, 7 is a memory for temporarily storing data to be written and read data, and 8 is compressing or expanding data A data compression / decompression unit, 9 is an A / D converter for converting audio input into digital data, and 10 is a D / A for converting digital data decompressed and restored to original data into an analog signal and outputting as an audio signal. It is a converter.

Reference numeral 11 is a spindle motor for rotating the magneto-optical disk 1, 12 is a lens, 13 is an optical pickup for reading data recorded on the magneto-optical disk 1, and 14 is a feed motor for driving the optical pickup 13. Reference numeral 15 is a servo control circuit that servo-controls the spindle motor 11 and the feed motor 14, and 16 is a display unit that displays various necessary displays. Reference numeral 17 is a key input unit having various operation keys for performing key operations, and is provided with an FF key (forward search key) 17a and an FR key (reverse search key) 17b for instructing a search operation. There is.

Reference numeral 18 denotes a system controller that controls the EFM modulator / CIRC unit 5, the earthquake-resistant memory controller 6, and the servo control circuit 15, and is composed of a microcomputer. Further, the memory 18a of this microcomputer stores a program for the mounted disc determination processing shown in FIG. 2 for efficiently performing the target track search operation.

Next, the mounted disc size determination processing operation for efficiently and quickly performing the search operation of the optical disc reproducing apparatus of the present embodiment will be described based on the flowchart shown in FIG. First, the size of the mounted disk is determined by detecting the acceleration corresponding to the inertia when the rotational speed of the mounted disk is changed. Then, it is judged whether the mounted disk size judgment result is 8 cm disk or 12 cm disk (step S1), and the judgment result is stored (step S2). Then, the TOC section is further read (step S3), and the TOC section records information as to whether or not the mounting disc is a multi-session disc. Further determination is made (step S4). When the determination result is a multi-session disc, it is determined that the disc is a 12-centimeter multi-session disc even if the determination result in the step S1 is not a 12-centimeter disc (step S5). On the other hand, when it is determined in step S4 that the disc is not a multi-session disc, the determination result stored in step S2 is adopted, and the disc is certified (step S6).

Therefore, even if there is an error in the disc determination in step S1 and the 12 cm multi-session disc is mistakenly determined to be an 8 cm disc, the determination result in step S1 is corrected by the determination result in step S4. To be done. Therefore, the reliability of disc size determination is improved, and the time required for the target track search operation can be statistically shortened.

[0017]

[Effect of device]

 As described above, according to the present invention, even if there is an error in the determination result by the determination unit that determines the disk size based on the acceleration detected when the rotational speed of the disk is changed, the TOC section reads it. Since the determination error is corrected, there is an effect that reliability in determining the mounted disc size type is improved and the time required for the search operation can be shortened.

[Submission date] April 4, 1995

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

[Means for Solving the Problems]

 The optical disc reproducing apparatus according to the present invention is an optical disc reproducing apparatus that reproduces a recording track in which information pits are spirally recorded by an optical pickup by controlling the linear velocity to a constant value when the rotational speed of a mounted disc is accelerated. A TOC (Table Of Contents) section which is a recorded information section of the content data of the mounted disk after the mounted disk size judgment unit judges the mounted disk size based on the difference in the detected change amount. When the TOC section read result indicates that the disk is a specific type of disk, the disk is recognized as a mounted disk having the disk size of the specific type, and the TOC section read result is If the disc is not a disc, the mounting disk size determination Characterized in that it comprises a mounting disk size recognizing means for performing a mounting disc recognition in accordance with the determination result by.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a disc determination processing operation in the optical disc reproducing apparatus according to the embodiment of the present invention.

[Explanation of symbols]

 1 Magneto-optical disk 18 System controller 18a Memory (mounted disk size recognition means)

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[Procedure amendment]

[Submission date] April 4, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

Claims (3)

[Scope of utility model registration request] 1. An optical disc reproducing apparatus for reproducing a recording track in which information pits are spirally recorded by controlling a constant linear velocity by an optical pickup, and a difference in variation detected when the rotational speed of a mounted disc is accelerated. TOC (Tab (Tab
(le Of Contents) section is read, and when the TOC section read result indicates that the disk is the specific type, it is recognized as a mounted disk of the specific type disk size, and the TOC section read result is An optical disk reproducing apparatus comprising a mounted disk size recognizing means for recognizing a mounted disk according to the judgment result of the mounted disk size judging means when the disk is not the specific type of disk. 2. The optical disc reproducing apparatus according to claim 1, wherein the disc of the specific type is a 12-cm multi-session disc. 3. The mounted disk size determination means applies acceleration by a kick pulse when the mounted disk is rotated by a spindle motor for a predetermined time, and the mounted disk size is determined by the time from that time to the time when the constant linear velocity control is completed. 3. The optical disc reproducing apparatus according to claim 1, wherein the optical disc reproducing apparatus determines whether or not.