JPH04311874A - Optical disk reproducing device - Google Patents

Abstract

PURPOSE:To enable the rapid starting of reproducing by performing some operations necesitating till the starting of the reproducing like the judgment of the kind of an optical disk and others in short time, concerning with an optical disk reproducing device capable of reproducing plural kinds of the optical disk by a single device. CONSTITUTION:By a disk detector 17, the rising state of rotational speed when rotation is started by a rotation controller 15 is detected by a rotational speed detector 16, whether a laser disk 11 is loaded or not is judged, the destination of the moving of a pickup device 12 is specified to a position controller 14 in accordance with this result and simultaneously the revolutional speed is specified to the rotation controller 15.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc reproducing apparatus capable of reproducing a plurality of types of optical discs of different sizes with a single unit.

0002

2. Description of the Related Art In recent years, players that can play both compact discs and laser discs in one unit have become rapidly popular.

[0003] A conventional optical disc reproducing device will be explained below. FIG. 3 shows a block diagram of a conventional optical disc playback device. In FIG. 3, 30 is a compact disc, and 30P is the inner peripheral position of the information recording area on the compact disc 30. 31 is a laser disc, and 31P is the inner peripheral position of the information recording area on the laser disc 31. 32 is a pickup unit that reads out signals from the compact disc 30 and the laser disc 31. 33 drives the lens part of the pickup section 32 to control the focus;
This is a focus control unit that detects whether the light emitted from the compact disc 30 or the laser disc 31 is reflected and returns. 34 is a position control unit that moves the pickup unit 32 in the radial direction of the compact disc 30 and the laser disc 31. 35 moves the pickup section 32 to a predetermined position by the position control section 34;
This is a disc detection means that uses the focus control unit 33 to check the presence or absence of reflected light at that position to detect the presence or absence and type of an optical disc.

[0004] The optical disc playback device configured as described above detects the presence or absence and type of an optical disc before starting playback in order to play back a plurality of types of optical discs with a single device. The operation will be explained below using FIGS. 3 and 4. The figure is a flow diagram showing the operation.

First, the disk detection means 35 moves the pickup section 32 to the 31P position by the position control section 34. Next, the disk detection section 35 causes the focus control section 33 to perform a focusing operation on the pickup section 32 at the 31P position, detects the presence or absence of reflected light, and determines that the laser disk 31 is mounted if there is reflected light. If there is no reflected light, the disk detection means 35 causes the position control section 34 to move the pickup section 32 to the 30P position. next,
The disk detecting section 35 detects the focus control section 3 at the 30P position.
3, the pickup unit 32 is focused and the presence or absence of reflected light is detected. If there is reflected light, it is determined that the compact disc 30 has been loaded. If there is no reflected light, it is determined that the optical disc is not installed.

[0006]

However, in the above-mentioned conventional configuration, the pickup section 32 is moved to check whether the compact disc 30 is mounted after checking whether the laser disc is mounted. The problem was that the start of playback was delayed.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide an optical disc playback device that detects the presence and type of an optical disc in a short time and promptly starts playback.

[0008]

[Means for Solving the Problems] In order to achieve this object, the optical disc playback device of the present invention detects the rising state of the rotational speed when the rotation control unit starts rotating, and then mounts Based on this result, the position control unit moves the pickup device to the playback start position of the determined type of optical disc, and at the same time, the rotation control unit moves the pickup device to the playback start position of the determined type of optical disc. The disc detecting means is provided to set the rotation speed to a specified speed during playback.

[0009]

[Operation] With this configuration, the type of optical disc loaded can be determined in a short time, and the operations necessary before the start of subsequent playback can be performed immediately, so that playback can be started quickly.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of an optical disc reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 10 is a compact disc, and 10P is the inner peripheral position of the information recording area on the compact disc 10. 11
is a laser disc, and 11P is the inner peripheral position of the information recording area on the laser disc 11. 12 is a pickup section that reads out signals from the compact disc 10 and the laser disc 11; 13 is the pickup section 12
This is a focus control section that controls the focus by driving the lens portion of the pickup section 12 and detects whether the light emitted from the pickup section 12 is reflected on the compact disk 10 or the laser disk 11 and returns. Reference numeral 14 denotes a position control unit that moves the pickup unit 12 in the radial direction of the compact disc 10 and the laser disc 11. Reference numeral 15 denotes a rotation control unit to which the compact disc 10 or the laser disc 11 is mounted and rotated. Reference numeral 16 denotes a rotation speed detection section that detects the rotation speed of the rotation control section 15. 17 detects the rising state of the rotation speed when the rotation control section 15 starts rotating by the rotation speed detection section 16, determines whether or not the laser disc 11 is mounted, and picks it up in the position control section 14 according to this result. This disk detection means specifies the destination of the movement of the section 12 and at the same time specifies the rotation speed to the rotation control section 15.

The optical disc playback device configured as described above detects the presence or absence and type of an optical disc before starting playback in order to play back a plurality of types of optical discs with a single device. The operation will be explained below using FIGS. 1 and 2. FIG. 2 is a flow diagram showing the operation.

First, the disk detection means 17 causes the position control section 14 to move the pickup section 12 to an intermediate position between 10P and 11P. Next, the disc detection unit 17 starts rotating the rotation control unit 15 from the stopped state at that position, detects the time to reach the set rotation speed using the rotation speed detection unit 16, and if the set rotation speed is exceeded, the laser disc 11 is determined to be attached, the position control unit 14 immediately moves the pickup unit 12 to the 11P position, and at the same time the rotation control unit 1 moves the pickup unit 12 to the 11P position.
5 is set as the specified rotational speed of the laser disc 11 during reproduction. If the time is less than the set time, the position control section 14 immediately moves the pickup section 12 to the 10P position, and at the same time, the rotation control section 15 is set to the specified rotation speed for playing back the compact disc 10. Next, the disc detection unit 17 causes the focus control unit 13 to perform a focusing operation on the pickup unit 12 at the 10P position, detects the presence or absence of reflected light, and determines that a compact disc has been loaded if there is reflected light. If there is no reflected light, it is determined that the optical disc is not installed.

As described above, according to this embodiment, the rotation speed detecting section detects the rising state of the rotation speed when the rotation control section starts rotating, and determines the type of the optical disc mounted. According to this result, the position control unit moves the pickup unit to the playback start position of the determined type of optical disc, and at the same time, the disc detection means causes the rotation control unit to set the rotational speed to the specified rotation speed for playback of the determined type of optical disc. By providing this, it is possible to determine the type of optical disc and perform other operations necessary before starting playback in a short time, so playback can be started promptly.

[0015] In the embodiment, the laser disc 11
After determining that the pickup unit 12 is attached, the position control unit 14 immediately moves the pickup unit 12 to the 11P position, and then the focus control unit 13 starts focusing the pickup unit 12. However, if there is no reflected light, the single-sided resin laser It can be determined that the resin surface of the disk is mounted with the disk facing the pickup section 12. Further, if there is no reflected light at the 10P position, it is determined that the optical disc is not loaded, but the label side of the compact disc 10 may be loaded with the label side facing the pickup section 12. In addition, 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 disc 11 has been loaded, but by setting multiple set times, the types of laser discs such as 20 cm disc, 30 cm disc, etc. It is also possible to detect

[0016]

[Effects of the Invention] As described above, the present invention detects the rising state of the rotation speed when the rotation control unit starts rotating using the rotation speed detection unit, determines the type of optical disc mounted, and detects the rising state of the rotation speed when the rotation control unit starts rotating. According to the result, the position control section includes a disk detection means that moves the pickup device to the playback start position of the determined type of optical disk, and at the same time causes the rotation control section to maintain a prescribed rotation speed for playback of the determined type of optical disk. This makes it possible to determine the type of optical disc loaded in a short time and perform the necessary operations immediately before starting playback, making it an excellent optical disc that can quickly start playback. This makes it possible to realize a playback device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an optical disc playback device in an embodiment of the present invention.

FIG. 2 is a flowchart showing an optical disc playback device in an embodiment of the present invention.

[Figure 3] Block diagram showing a conventional optical disc playback device

[Figure 4] Flowchart showing a conventional optical disc playback device

[Explanation of symbols]

12 Pickup section 13 Focus control section 14 Position control section 15 Rotation control section 16 Rotation speed detection section 17 Disk detection means

Claims (1)

[Claims] 1. A pickup unit that reads signals from an optical disc, a position control unit that moves the pickup unit in a radial direction of the optical disc, a rotation control unit that attaches and rotates the optical disc, and a rotation control unit that rotates the optical disc. a rotational speed detection unit that detects the rotational speed of the control unit; and a rotational speed detection unit that detects a rising state of the rotational speed when the rotation control unit starts rotating, and determines the type of optical disc that is mounted. Then, according to this result, the position control section moves the pickup section to the playback start position of the determined type of optical disc, and at the same time, the rotation control section moves the pickup section to the specified rotational speed for playback of the determined type of optical disc. What is claimed is: 1. An optical disc playback device comprising a disc detection means for detecting a disc.