Information reproduction apparatus, information carrier, and information recording apparatus

Abstract

An information reproduction apparatus of the present invention comprises a rotating section 2 for rotating an information carrier 1 on which a unit of continuous information capable of being continuously read out is recorded, a CLV control section 9 for controlling the rotating section in such a manner that the information carrier is rotated at a constant linear velocity, a CAV control section 9 for controlling the rotating section in such a manner that the information carrier is rotated at a constant angular velocity, a rotation control selection 14 for selectively operating the CLV or CAV control section, and an information determination section 14 for detecting an information length of the continuous information. The rotation control selection section is constructed in such a manner as to selectively operate the CLV or CAV control section based on a result of the detection of the information length of the continuous information.

Description

TECHNICAL FIELD [0001] The present invention relates to an information reproduction apparatus for reproducing information recorded on a disk-like information carrier, the disk-like information carrier, and an information recording apparatus for recording information on the information carrier. BACKGROUND ART [0002] CDs (Compact Disk) and DVDs (Digital Versatile Disk) have respective unified physical format standards in which information is recorded into prepits at a linear velocity of 1.3 m / s for CDs and at a linear velocity of 3.49 m / s for DVDs regardless of whether the information is audio / video information or code information. [0003] For apparatuses (CD players and DVD players) for reproducing audio / video information thus recorded on a disk at a constant linear velocity, conventionally, access performance is not considered to be important, and CLV (Constant Linear Velocity) control is performed in order to secure a low level of noise and vibration. In CLV control, the number of r...

AI Technical Summary

Benefits of technology

[0118] As described above, according to the information reproduction apparatus of the present invention, CAV control and CLV control are switched between depending on properties of the information, such as the size or type of continuous information to be continuously reproduced. Therefore, information recorded on a single disk or different disks can be reproduced with appropriate rotational driving control depending on the properties, thereby making it possible to improve access performance. Since rotation is not increased more than necessary for the properties of the information, noise or vibration of the apparatus due to rotation of a spindle motor is reduced.

[0119] Further, according to the information carrier and the information recording apparatus of the present invention, data having a large size of continuous information to be continuously reproduced is recorded at the inner circumference side of a disk, while data having a small size of continuous information to be continuously reproduced is recorded at the outer circumference side of the disk. Therefore, an even higher level of access performance can be achieved in reproduction. According to the information carrier of the present invention, continuous information, such as music and video, is previously recorded in an inner circumference area of a disk as pit information in the form of pits and lands. Subsequently, information created by a user, or the like can be additionally recorded in an outer circumference area of a disk. The rotation of such a partial ROM disk can be easily controlled in reproduction / recording according to the present invention.

Problems solved by technology

In such a case, even when code information is randomly accessed from an application on a host computer, the response time of a spindle motor predominantly occupies the access time, resulting in a significant reduction in access speed.

Further, the noise caused by driving the motor in the access causes problems.

Although a host computer exhibits almost the same performance in outputting audio or displaying moving images if a transfer rate is greater than or equal to a predetermined value, a spindle motor is rotated at a higher speed greater than or equal to a required value, so that rotation, or vibration due to mass eccentricity or the like causes noise.

Further, noise or heat is generated in a spindle motor in the switching.

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