JPS6288170A - Fast access device for compact disk - Google Patents

Abstract

PURPOSE:To accumulate temporarily a data, to eliminate a blank data, and to speed up an access by controlling a compact disk to a constant linear volocity faster than an ordinarily prescribed linear velocity by a linear velocity control device. CONSTITUTION:When a compact disk CD is brought to an access, a system control device 14 drives a linear velocity control device 11 and brings the disk to a rotation control to rotate it with the constant linear velocity at high speed. Also, the control device 14 moves an optical pickup provided on a data reader 12, in the radial direction of the CD, and it approaches a recording track containing a position to be brought to an access. Subsequently, an elapsed time code recorded in the CD rotating at the high speed by the device 11 is read by the device 12, and outputted to the control device 14. By this control device 14, is code is utilized, and he device 12 is controlled more exactly. In this state, the control device 14 instructs to the device 12 to output a data, the data is written in a data recording device 13, the blank data is eliminated, and the access is executed at the high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a high-speed access device for compact discs including CD-ROMs.

(Prior Art) In recent years, compact discs (hereinafter referred to as CDs) have been developed for high-fidelity audio, but due to their enormous storage capacity, CD-ROMs can store information other than music, such as text information and graphic information. It has been increasingly used in information devices such as

FIG. 2 is a block diagram showing an example of a conventional CD access device, in which 21 is a linear velocity control device that controls the CD at a constant linear velocity, and 22 is a linear velocity control device that controls the CD at a constant linear velocity.
A data reading device 23 is a system control device that reads the data stored in the data reading device 22, and uses the elapsed time code recorded as a time code on the CD read by the data reading device 22 to read the data stored on the CD. The data reading device 22 is controlled so that the optical pickup moves to the desired position.

In the CD access device configured in this way, first, the system control device 23 moves an optical pickup (not shown) included in the data reading device 22 in the radial direction of the CD,
Approach the recording track on the CD containing the location to be accessed. Thereafter, the data reader 22 reads the elapsed time code of the CD which is being rotated at a prescribed linear velocity by the linear velocity controller 21 and outputs it to the system controller 23 . The system controller 23 uses the elapsed time code to more accurately control the data reader 22 so that the optical pickup moves to the track to be moved. After the optical pickup reaches the recording trunk on the target CD, wait for the CD to rotate until the position to be accessed reaches the position of the optical pickup,
When the system controller 23 arrives, the data reader 2
Let 2 perform the 8 forces of data.

(Problem to be solved by the invention) However, in such a conventional access method, C
The time required to read the elapsed time code included as a time code in the recorded data of D, and the information on the recording track to which the optical pickup should be accessed after the optical pickup reaches the recording track containing the position to be accessed. The disadvantage is that the time required to reach a position is limited by the CD's prescribed linear velocity, which affects the access time.

In view of the above-mentioned conventional drawbacks, the present invention aims to provide a high-speed CD access device in which the access time is not restricted to a specified linear velocity.

(Means for Solving the Problems) In order to eliminate the above-mentioned drawbacks, the present invention provides a linear velocity control device that can control the CD to a constant linear velocity even at a linear velocity higher than a specified linear velocity, and A configuration comprising a data reading device capable of reading data from a CD even at linear velocity, a data storage device that temporarily stores data read by the data reading device, and a system control device that controls each of the above devices. Solved by 6 (Operation) According to the present invention, since the above-mentioned configuration rotates the CD at high speed and accesses it, the access time can be shortened, making information equipment etc. that use CD-ROM extremely effective. can be taken as a thing.

(Example) Hereinafter, the present invention will be explained in detail by way of an example using the drawings.

FIG. 1 is a block diagram of a compact disc high-speed access device showing one embodiment of the present invention. In the figure, 11
12 is a linear velocity control device capable of controlling the CD to a constant linear velocity at a prescribed linear velocity and constant rotation control at a higher linear velocity different from the prescribed linear velocity; 12 is a data reading device; It is possible to read data recorded on a CD not only during rotation at the prescribed linear velocity described above, but also during rotation at other high-speed linear velocities, including the other high-speed linear velocities mentioned above. Reference numeral 13 denotes a data storage device which temporarily stores data read by the data reading device [12] and fills in data blanks when the rotation of the CD changes from high speed to a specified linear speed. It is. Also 1
4 is a system control device, and C is connected to the linear velocity control device 11.
Instructs whether to rotate D at a specified linear velocity or a high linear velocity, and further uses the elapsed time code of the CD read by the data reader 12 to create a record containing the position of the CD to be accessed. On the truck.

Data reading device 1 so that the optical pickup moves
2, and also instructs the write/read timing and address of the data storage device 13.

In the present invention configured as described above, first, at the time of access, the system control device 14 drives the linear velocity control device 11 to control the rotation to a high constant linear velocity. Further, the system control device 14 moves the optical pickup included in the data reading device 12 in the radial direction of the CD to approach the recording track containing the position to be accessed. Next, the data reader 12 reads the elapsed time code recorded on the CD which is being rotated at a high linear velocity by the linear velocity controller 11 and outputs it to the system controller 14 .

The system controller 14 utilizes the elapsed time code to control the data reader 12 so that the CD is moved to the recording track to be moved with greater accuracy. After reaching the recording track to be moved, the optical pickup waits for the CD to rotate until the position to be accessed reaches the position of the optical pickup,
After its arrival, the system controller 14 commands the data reader 12 to output the data and at the same time the data storage device 1
3 to write and read data from the data reading device 112.

The data output from the data reading device 12 is immediately output from the data storage device 13, but since the amount of data written to the data storage device 13 is greater than the amount of data read out, the data gradually accumulates. . When the data has accumulated a certain amount, the system controller 1
4 changes the linear velocity control device 11 to control the prescribed linear velocity. After the system control device 14 has stabilized at the specified linear velocity, the system control device 14 operates the data reading device 12 so as to continue with the last data written in the data storage device 13 in the same way as the high-speed linear velocity described above. It controls to access the CD and output data.

Since the amount of data stored in the data storage device 13 is greater than the amount of data blanks that occur when accessing at a prescribed linear velocity, the data output from the data storage device 13 is not interrupted.

As described above, the present invention includes a linear velocity control device 11 that controls the linear velocity of a CD to a constant linear velocity at a higher than specified linear velocity during access, and eliminates data blanks when returning from a high speed to a specified normal linear velocity. By providing a data storage device for this purpose, high-speed access becomes possible without being limited by the prescribed linear speed of CD.

(Effects of the Invention) As explained above, the present invention provides a linear velocity control device that controls Ci) at a constant linear velocity higher than a normal prescribed linear velocity, and a high-speed linear velocity control device capable of temporarily storing data. By providing a data storage device to eliminate data blanks when moving from a linear velocity to a specified normal linear velocity, as in the past,
It becomes possible to access at high speed without being limited by the normal linear speed specified for CDs.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of a device showing an embodiment of the present invention, and FIG. 2 is a schematic block diagram showing a conventional device. 11.21 ... linear velocity control device, 1'2.22
... data reading device, 13 ... data storage device, 14.23 ... system control device. Figure 1 CD Figure 2

Claims (1)

[Claims] A predetermined linear velocity of the compact disc and
A linear velocity control device capable of constantly rotating the compact disc at a higher linear velocity, and data stored on the compact disc while the compact disc is rotating at both a prescribed linear velocity and a higher linear velocity. A data reading device that can read data, a data storage device that temporarily stores the read data, and a linear velocity that determines whether to rotate the compact disc at a specified linear velocity or a higher linear velocity. instructing the control device, and
Using the elapsed time code of the compact disc read by the data reading device, the data reading device is controlled so that the optical pickup moves to the recording track containing the position to be accessed on the compact disc, and further, the data storage device a system control device that instructs writing and reading timing and addresses to the compact disk; and a system control device that instructs the data to be temporarily stored in the data storage device when the rotation of the compact disk changes from a high linear velocity to a specified linear velocity. A compact disc high-speed access device is characterized in that it interpolates data blanks that occur.