JP2982349B2 - Optical disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing apparatus for reading recorded information from a disk-shaped recording medium.

[0002]

2. Description of the Related Art In recent years, players capable of reproducing a single compact disk and a single laser disk have become remarkably popular.

[0003] A conventional optical disk reproducing apparatus will be described below. FIG. 3 is a block diagram showing a conventional optical disc reproducing apparatus. In FIG. 3, reference numeral 30 denotes a compact disk, 30P denotes an inner peripheral position of an information recording area on the compact disk 30, 31 denotes a laser disk, 31P denotes an inner peripheral position of an information recording area on the laser disk 31, and 32 denotes a compact disk and a laser disk. A pickup unit for reading out signals from 31, 3
3 is a focus control unit that drives the lens unit of the pickup unit 32 to perform focus control, and detects whether light emitted from the pickup unit 32 is reflected by the compact disk 30 or the laser disk 31 and returns.
Numeral 34 denotes a position control unit for moving the pickup unit 32 in the radial direction of the compact disk 30 and laser disk 31. Reference numeral 35 moves the pickup unit 32 to a predetermined position by the position control unit 34. This is a disk detection unit that detects the presence or absence of reflected light and detects the presence and type of the optical disk.

[0004] The optical disk reproducing apparatus configured as described above detects the presence and type of the optical disk before the start of reproduction in order to reproduce a plurality of types of optical disks with a single apparatus. The operation will be described below. First, the disc detection unit 35 moves the pickup unit 32 to the position 31P by the position control unit 34. Next, the disc detection unit 35 performs the focusing operation of the pickup unit 32 by the focus control unit 33 at the 31P position to detect the presence or absence of reflected light.
Is determined to be attached. When there is no reflected light, the disc detection unit 35 controls the pickup unit 3 by the position control unit 34.
2 is moved to the 30P position. Next, the disk detection unit 35
In the position 30P, the focus control unit 33 performs the focusing operation of the pickup unit 32 to detect the presence or absence of reflected light. If there is reflected light, it is determined that the compact disc 30 is mounted. If there is no reflected light, it is determined that the optical disc is not mounted. FIG. 4 is a flowchart showing the above operation.

[0005]

However, in the above-described conventional configuration, the presence or absence of reflected light due to the focus operation is detected only at one point on the optical disk, so that a fingerprint or dust or the like is present at the detection position of the optical disk. In some cases, there is a problem in that the reflected light is small and an erroneous detection is made when the optical disc is not mounted.

An object of the present invention is to solve the above-mentioned conventional problems, and it is an object of the present invention to improve the accuracy of detecting the presence / absence of mounting an optical disk.

[0007]

In order to achieve the above object, an optical disk reproducing apparatus according to the present invention is provided at a plurality of radial positions of an optical disk being rotated by a rotation controller.
It has a disc detection unit that detects the presence or absence of reflected light by the focus control unit and detects the presence or absence of an optical disc.

[0008]

With this configuration, the presence or absence of reflected light due to the focus operation is detected at a plurality of points on the optical disk. Therefore, even if the optical disk has a fingerprint or dust,
The probability of erroneously detecting that the optical disc has not been loaded even though it has been loaded is reduced.

[0009]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an optical disc reproducing apparatus according to an embodiment. In FIG. 1, reference numeral 10 denotes a compact disk, 10 P denotes an inner circumferential position of an information recording area of the compact disk 10, 11 denotes a laser disk, 11 P denotes an inner circumferential position of an information recording area of the laser disk 11, and 12 denotes a compact disk 10 and a laser disk. Pickup unit for reading out signals from 11, 1
3 is a focus control unit that drives the lens unit of the pickup unit 12 to perform focus control, and detects whether light emitted from the pickup unit 12 is reflected by the compact disk 10 or the laser disk 11 and returns.
14 is a position control unit for moving the pickup unit 12 in the radial direction of the compact disk 10 and the laser disk 11, 15 is a rotation control unit for mounting and rotating the compact disk 10 or the laser disk 11, and 16 is rotation of the rotation control unit 15. Rotation speed detection unit for detecting speed, 17
The rotation speed detector 16 detects a rising state of the rotation speed when the rotation controller 15 starts rotating, determines whether or not the laser disk 11 is mounted, and in accordance with the result, the position control unit 14 picks up the pickup unit. 12 is a disk detection unit that specifies the destination of the movement of the pickup unit 12 and simultaneously specifies the rotation speed to the rotation control unit 15.
The focus operation of No. 2 is started.

The optical disk reproducing apparatus configured as described above detects the presence and type of the optical disk before starting the reproduction in order to reproduce a plurality of types of optical disks with a single device. The operation will be described below. First,
The disc detecting unit 17 moves the pickup unit 12 to an intermediate position between 10P and 11P by the position control unit 14. Next, the disk detecting unit 17 starts the rotation of the rotation control unit 15 from the stop state at that position, detects the time to reach the set rotation speed using the rotation speed detection unit 16, Is determined to be mounted, and the position control unit 14 immediately moves the pickup unit 12 to 11P.
To the position, and at the same time, set the rotation control unit 15 to the specified rotation speed during reproduction of the laser disk 11. If the time is less than the set time, the focus control unit 13 immediately starts the focus operation of the pickup unit 12, and at the same time, moves the pickup unit 12 to the 10P position by the position control unit 14;
0 is set to the specified rotation speed at the time of reproduction. Next, the disc detection unit 17 controls the pickup unit 1 by the focus control unit 13.
2 detects the presence or absence of reflected light during and after movement to the 10P position, and if there is reflected light, the compact disc 10
Is determined to be attached. If there is no reflected light, it is determined that the compact disc 10 is not mounted. FIG. 2 is a flowchart showing a part of the above operation.

As described above, according to this embodiment, the presence or absence of reflected light due to the focus operation is detected at a plurality of points on the optical disk. The probability that an erroneous detection is made that a type disk is not mounted despite being mounted is reduced. In addition, the reproduction can be started earlier than in the conventional example in which the focus operation is started after the movement of the pickup unit is completed.

In the above embodiment, when the position controller 14 moves the pickup unit 12 to the 11P position immediately after judging that the laser disk 11 has been mounted, if the movement position is slightly outward from the 11P position, 10P is required. Similarly to the movement to the position, the detection of the presence or absence of reflected light by the focus control unit 13 during and after the movement is also effective. At this time, if there is no reflected light, it can be determined that the resin surface of the single-sided resin laser disk is mounted toward the pickup unit 12. When there is no reflected light at the 10P position, it is determined that the optical disc is not loaded. However, the label surface of the compact disc 10 may be loaded toward the pickup unit 12 in some cases. Also, the time to reach the set rotation speed is detected, and if it is longer than the set time, it is determined that the laser disk 11 has been mounted. Can also be detected.

[0014]

As described above, according to the present invention, at a plurality of radial positions of the optical disk being rotated by the rotation control unit,
By providing a disk detection unit that detects the presence or absence of reflected light by the focus control unit and detects the presence or absence of the optical disk, the presence or absence of reflected light due to the focus operation is detected at multiple points on the optical disk. Even when the optical disk has a fingerprint or dust, the probability of erroneously detecting that the optical disk is not mounted despite being mounted is reduced.

[Brief description of the drawings]

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

FIG. 2 is a flowchart of an optical disc reproducing apparatus according to an embodiment of the present invention.

FIG. 3 is a block diagram of a conventional optical disc reproducing apparatus.

FIG. 4 is a flowchart of a conventional optical disc reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Pickup part 13 Focus control part 14 Position control part 15 Rotation control part 16 Rotation speed detection part 17 Disk detection part

Claims (1)

(57) [Claims] 1. A pickup section for reading a signal from an optical disc, and a lens section of the pickup section is driven to perform focus control, and whether light emitted from the pickup section is reflected on the optical disc and returned. A focus control unit for detecting whether or not the optical disk is moved in a radial direction of the optical disk, a rotation control unit for mounting and rotating the optical disk, and a rotation control unit for rotating the optical disk. An optical disc reproducing apparatus, comprising: disc detection means for detecting the presence or absence of reflected light by the focus control unit at a plurality of radial positions of the optical disc to detect the presence or absence of the optical disc.