JPS62109273A - Correcting and accessing device for eccentricity of compact disc - Google Patents

Abstract

PURPOSE:To improve the moving accuracy of a pickup at an initial stage in an access time and to realize a high access by providing an eccentric quantity storage device capable of storing an eccentric quantity against the rotating angle of a compact disc detected at an eccentric quantity detection device and reading out the eccentric quantity of required rotating angle. CONSTITUTION:An eccentric quantity detection device 16 detects the eccentric quantity against the rotating angle of the compact disc by the output control signals of a pickup position control device 14 and a pickup angle control device 15 and a signal regarding the rotating angle of the compact disc obtained from a rotation control device 11. An eccentric quantity storage device 17 stores the eccentric quantity against the rotating angle of the compact disc detected at the eccentric quantity detection device 16. And at the moving time of the pickup in the radius direction of the compact disc performed at the initial stage in the access time, a system controller 13 controls the pickup position control device 14 based upon a value in which a data regarding a position and a lapse time within a read-in area at the compact disc is corrected with the data at the eccentric quantity storage device 17, and moves the pickup.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a compact disc eccentricity correction access device that enables faster access in a compact disc playback device.

2. Description of the Related Art In recent years, there has been a need for compact disc access devices that can complete access in a shorter time.

An example of the above-mentioned conventional compact disc access device will be described below with reference to the drawings.

FIG. 2 shows a block diagram of a conventional compact disc access device. In FIG. 2, 21 is a rotation control device that controls the rotation of the compact disk, 22 is a data reading device that reads data from the compact disk that is rotating at a specified speed in the rotation control device 21, and 23
24 is a system control device that controls the pickup position control device 24 and the pickup angle control device 25 at the time of access based on data regarding elapsed time and position read by the data reading device 22; The pickup position control device 26 is a pickup angle control device that controls the radial reading position of the compact disc at the tilt angle of the above-mentioned Vinokasoi degrees.

The operation of the compact disc access device configured as described above will be explained below.

First, the data reading device 22 reads data regarding the elapsed time and position within the lead-in area of the compact disc being rotated by the rotation control device 21. At the time of access, the system controller 2 first uses this data as a base.
3 uses the pickup position control device 24 to move the pink amplifier. Next, the data reading device 22 reads the position of the pickup on the compact disk after the movement, and the system control device 23 uses the pickup position control device 24 and the pickup angle control device 25 to adjust the position to the required position on the compact disk. It's getting complicated.

Problems to be Solved by the Invention However, in the above configuration, the high-speed access pickup position control device does not count the tracks on the compact disc and move at a slow speed, but moves at high speed by targeting the distance from the center of the compact disc. Since the pickup moves, eccentricity of the compact disk, misalignment of the shaft of the rotation control device, etc., causes an error in the movement of the pickup at the beginning of the access, resulting in a problem that the access time is delayed.

In view of the above-mentioned problems, the present invention provides a compact disk eccentricity correction access device that corrects errors caused by eccentricity of the compact disk, etc., caused by movement of the pickup in the radial direction of the compact disk during the initial stage of access. .

Means for Solving the Problems In order to solve the above problems, the compact disk eccentricity correction access device of the present invention uses an output control signal of the pickup position control device, an output control signal of the pick amplifier angle control device, and an output control signal of the rotation control device. An eccentricity detection device detects the amount of eccentricity of the compact disk from three signals including a signal related to the rotation angle of the compact disk, and a device stores the amount of eccentricity relative to the rotation angle of the compact disk detected by the eccentricity detection device and calculates the required rotation angle. It is equipped with an eccentricity storage device that can read out the eccentricity.

According to the present invention, with the above-described configuration, the amount of eccentricity with respect to the rotation angle of the compact disk is stored in advance, and when the pickup moves in the radial direction of the compact disk at the initial stage of access, the amount of eccentricity is determined by the amount of eccentricity described above. can be corrected.

Embodiments Hereinafter, compact disk eccentricity correction access devices according to embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a compact disk eccentricity correction access device according to an embodiment of the present invention. In FIG. 1, 11 is a rotation control device that can control the rotation of the compact disk and notify the state of the rotation angle of the compact disk, and 12 is the rotation control device 11 that can control the rotation of the compact disk and notify the state of the rotation angle of the compact disk. 13 is a data reading device 12 for reading data;
A system control device 14 controls the pickup position control device 14 and the pickup angle control device 16 at the time of access, based on values obtained by correcting the data regarding the elapsed time and position read by the data of the eccentricity storage device 17 described later. A pickup position control device that controls the radial movement of the compact disk of the pickup in the data reading device 12; 15 a pickup angle control device that controls the radial reading position of the compact disk by the inclination angle of the pickup; 16 the pickup Position control device 14
An eccentricity detection device 17 detects the eccentricity of the compact disk from three signals: the output signal of the pickup control device 15, and the signal related to the rotation angle of the compact disk obtained from the rotation control device 11. This is an eccentricity storage device that can store the amount of eccentricity with respect to the rotation angle of the compact disc detected in step 16 and read out the amount of eccentricity of the required rotation angle.

The operation of the compact disk eccentricity correcting access device constructed as described above will be explained below with reference to FIG.

The data on the compact disc being rotated by the rotation control device 11 is read by the data reading device 1 under the control of the big amplifier position control device 14 and the pickup angle control device 16.
2 performs the operation of reading data. At this time, the eccentricity detection device 16 detects the eccentricity with respect to the rotation angle of the compact disk from the output control signals of the pickup position control device 14 and the pickup angle control device 15 and the signal regarding the rotation angle of the compact disk obtained from the rotation control device 11. do. Next, the eccentricity storage device 17 is the eccentricity detection device 1.
The amount of eccentricity with respect to the rotation angle of the compact disc detected in step 6, for example, the amount of eccentricity with respect to every 600 rotation angles is stored. When the pickup moves in the radial direction of the compact disc at the initial stage of access, the controller
The system control device 13 controls the pickup position control device 14 to move the pickup based on the data on the elapsed time and position in the lead-in area of the pickup disk corrected with the data in the eccentricity storage device 1. Then, the data reading device 12 reads the position of the pickup on the compact disk after the movement, and the system control device 13 reads the position of the pickup on the compact disk.
The pickup position control device 14 and pickup angle control device 15 are used to align the reading position of the pick amplifier to the required position on the compact disc. The higher the accuracy, the shorter it will be.

As described above, according to this embodiment, faster access can be realized by providing the eccentricity detection device and the eccentricity storage device to improve the accuracy of the movement of the pickup in the initial stage of access.

Effects of the Invention As described above, the present invention detects the eccentricity of a compact disc using three signals: the output control signal of the big amplifier position control device, the output control signal of the pickup angle control device, and the signal related to the rotation angle of the compact disc of the rotation control device. By providing an eccentricity detection device that detects the amount of eccentricity and an eccentricity storage device that stores the eccentricity relative to the rotation angle of the compact disc detected by the eccentricity detection device and reads out the eccentricity of the required rotation angle, It is possible to improve the movement accuracy of the initial stage pick-up and achieve faster access.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a compact disk eccentricity correction access device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional compact disk access device. 11...Rotation control device, 12...Data reading device, 13...System control device, 1
4...Pickup position control device, 16...
... Pickup angle control device, 16 ... Eccentricity detection device, 17 ... Eccentricity storage device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] An output control signal of a pickup position control device that controls the movement of the pickup in the radial direction of the compact disk and an output control signal of the pickup angle control device that controls the radial reading position of the compact disk using the tilt angle of the pickup and rotation of the compact disk. an eccentricity detection device that detects the amount of eccentricity of the compact disk from three signals, including a signal related to the rotation angle of the compact disk obtained from the rotation control device that controls the compact disk; 1. A compact disk eccentricity correction access device comprising: an eccentricity storage device capable of storing the amount of eccentricity and reading out the eccentricity of a necessary rotation angle.