JPH0426978A - Compact disk - Google Patents

Abstract

PURPOSE:To use the compact disk more conveniently by providing a magnetic substance part composed of the some magnetic material as a floppy diskette with only at one side of the diskette. CONSTITUTION:The entire back side of the compact disk (CD) is arranged as a magnetic substance part 2, the disk is equipped with respective tracks and sectors in the concentric circular of a hole 1b in construction, and has complete compatibility with other general floppy diskettes. As a data stored in the magnetic substance part 2, for example, in the case of storing a lot of pieces of music in a CD 1, data such as the one designating the order of the music or the one showing which pieces of music are played until then among the designated pieces of music or the like, are stored. The data of the magnetic substance 2 is read or written through a magnetic head. Thus, the data can be read and written just like a conventional diskette, and the application extends specially by using the data together with the CD data so that the convenient CD can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a compact disc (hereinafter referred to as CD).

[Prior Art 1] In recent years, CDs have a large storage capacity and have come to be used in various fields. However, the CD in the conventional technology
The data area was only on one side and was read-only. Furthermore, a band-shaped magnetic stripe was arranged on the opposite side of the data area of the CD, and data on the magnetic stripe was read or written in the same way as with conventional diskettes.

[Problems to be Solved by the Invention] However, in the above-mentioned prior art, for example, a CD is used only for playback, and when it is desired to add appropriate comments to the usage history of the CD or the contents stored therein. The contents were stored in the magnetic stripe section of the CD and read out when necessary. However, the limited magnetic stripe has a problem that the amount of data that can be read or written is limited, making it extremely difficult to use in practice. This invention was made to solve such problems.
To obtain a CD which has the features of both a floppy diskette and a CD by making it possible to read or write a large amount of necessary information data.

[Means for Solving the Problems] The CD of the present invention is characterized in that only one side thereof has a magnetic body portion made of a magnetic material equivalent to that of a floppy diskette. A magnetic head is brought into close contact with the magnetic body, and necessary data is written into the magnetic body portion through the magnetic head, and the information is read out.

[Embodiment] FIG. 1(A) is a front view of a CD according to an embodiment of the present invention, and FIG. 1(B) is an explanatory diagram of a cross section in which the magnetic body portion is on the opposite side of the CD surface. It is. ] In the figure, (1) is a CD
In particular, this is a diagram in which the front of the CD is shown as the CD side (1a). (la) is an area where optical information read by a laser is stored, for example, (lb) is a hole for mounting on the drive device of CD (1), (2) is a magnetic body made of magnetic material, For example, it is made of the same material as floppy diskettes,
In the embodiment shown in Fig. 1, which has the same structure, the entire back side of the CD is arranged as a magnetic material part, and each track and each sector are arranged in the concentric circle of the hole (1b). The structure is completely compatible with general floppy diskettes. As for the data stored in the magnetic body part (2), for example, when a large number of songs are stored on the CD (1), the order of the songs is specified.

Alternatively, data such as which of the specified songs have been played is stored.

Data on the magnetic body (2) is written to a node or written via a magnetic head.

FIG. 2 shows a CD playback device, here a device configured for audio use.

(10) is a spindle motor, and the attached CD
(1) is rotationally driven; (11) is an optical pickup;
(12) is a focus/tracking servo mechanism, which constitutes a signal reproducing section. (13) is the linear motor 1, and the optical pickup (11) is connected to the CD (1
) in a straight line in the diametrical direction. (14) is a feed servo mechanism, which controls the linear motor 1 (13).

(15) is E F M (Eight to Four
This is a demodulation circuit (teen modulation) that demodulates the signal reproduced by the optical pickup (11) to the audio level.

(16) CL V (Constant Line
ar VeJocity) servo mechanism, which controls the rotation of the spindle motor (10). (17) is an audio CIRC (Cross Interleave R
eedSolomon Godel error detection unit and is equipped with a correction mechanism. (18) is RAM1, (19
) is a D/A converter, and (20) is a system controller. The above configuration is the same as that of a conventional CD playback device, and the following configuration is unique to this embodiment.6 The magnetic head (30) is a pickup terminal for reading or writing data from the magnetic stripe. (3), which transmits and receives signals from the magnetic stripe (2) in FIG. 1(B) in a non-contact manner via the magnetic head (30).
1) is an arm, and a magnetic head (30) is attached to the tip thereof. (32) A linear motor 2 whose shaft is attached to the other end of the arm (31), moves the arm (31) linearly in the diametrical direction of the CD (1), and moves the magnetic head (30) at the CD position. Stripe (2
) position. The feed servo (33) is a servo mechanism and controls the drive of the linear motor 2 (32). (34) temporarily stores data written to the magnetic stripe (2) of the CD (1) or data read from the magnetic stripe (2) via the magnetic head (3o) in the RAM 2. Control by feed servo (33) and R
The read/write timing of AM2 (34) is determined by the system controller (2o).

In the CD playback device configured as described above, the system controller (2o) first starts the feed servo (33) and then starts the linear motor (32).
After moving the magnetic head (30) linearly in the diametrical direction of the CD (1) and bringing the magnetic head (30) to the position of the magnetic stripe (2) of the CD (1), The head (30) and magnetic stripe (2) are brought into close contact.

Then, the data stored in the magnetic stripe (2) of the CD (1), for example, data on the playing order, is read out via the magnetic head (3o) without contact, and is then stored in the RAM2.
(34) to the system controller (20).

Furthermore, it is clear that when writing performance data to the magnetic stripe (2), it is possible to do so by performing the operation completely opposite to the above-mentioned reading operation.

The system controller (20) controls the feed servo mechanism (4) based on the performance order data, and drives the feed servo mechanism (14) and linear motor (13) to move the optical pickup (11) to the corresponding track. Some C
D Bring it to position (1). Then, the optical pickup (11) reads the corresponding data (1) from the CD (1), demodulates it in the EMF demodulation circuit (15), performs error detection in the audio CIRC error detection circuit (17), and then It is converted into an analog value by a D/A conversion circuit (19) and output as an audio signal.

For example, the content to be memorized is written in the usage history each time the device is used. For example, if the user plays up to the second song out of a plurality of stored songs, this information is stored in the magnetic body of the CD at the end of using the device. Then, when the device is used next time, the stored contents can be read first and the third song can be played.

By the way, in the above explanation, the case where the present invention is used for audio is described, but it goes without saying that it can be similarly used for game machines, computers, etc.

[Effects of the Invention] As described above, according to the present invention, a magnetic part made of the same material as a floppy diskette is arranged on one side of a CD to enable signal transmission and reception, so that one side is made of the same material as a floppy diskette. Because of its structure, data can be read/written in the same way as conventional diskettes, and when used in conjunction with CD data, the range of applications is greatly expanded, and an extremely user-friendly CD has been realized.

[Brief explanation of drawings]

FIGS. 1(A) and 1(B) are a plan view of a CD according to an embodiment of the present invention and an explanatory diagram of a cross section of the magnetic body part thereof, and (1) is a C
D, (2) is a magnetic material part. FIG. 2 is a block diagram showing the configuration of a CD playback device. D ・More than magnetic material part

Claims (1)

[Claims] A compact disk characterized by having a magnetic part made of the same magnetic material as a floppy diskette on only one side.