JPS61170929A - Optical information reproducing device - Google Patents

Abstract

PURPOSE:To provide compatibility between a rewritable type optical disk and a follow-up type optical disk by providing an optical disk identifying means and a playback signal inverting means which inverts recording information without discrimination at any time. CONSTITUTION:When information is reproduced, a reproducing signal inverting part 8 inverts or does not invert the reproducing signal 105 from an information recording area 6b to generate reproducing data 106, which is sent out to an information reproducing part 14. The disk identifying means 7 which discriminates between a rewritable type optical disk and a follow-up type optical disk is provided and when a loaded optical disk is the writable type optical disk, the reproducing signal is inverted in polarity at any time without any discrimination between the preformatted address information and recording information contained in the reproducing signal. Consequently, information having compatibility between the rewritable type optical disk and follow-up type optical disk is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is an information recording medium that uses a removable optical disk and a write-once optical disk as information recording media, and performs optical recording, reproduction, and erasing of information on these information recording media. The present invention relates to a playback device.

Conventional optical information reproducing devices include, for example, a rotating optical disk on which a photosensitive recording material (hereinafter abbreviated as recording material) is vapor-deposited, and a beam from a laser light source is focused onto the optical disk to a diameter of 1 μm or less. By irradiating a minute spot and modulating its optical output intensity with a recording signal, the phase change, refractive index change, or reflectance/transmission corresponds to the unevenness on the optical disk.

2. Description of the Related Art There is an apparatus that records information as a change in optical characteristics, such as a change in rate, and reproduces the recorded information by detecting the change in optical characteristics.

FIG. 2 shows an example of the format of an optical disc. In FIG. 2, only one track T on the optical disk is shown to simplify the drawing. nl, n2. ....

shows an address signal area in which a unique address number is recorded in each sector so that one track can be divided into a large number of sectors. /11.12°..., 4o indicates a data recording area in which information t is recorded and reproduced corresponding to each sector address. Note that the arrow in the figure indicates the rotation direction of the disk.

FIG. 3 is an enlarged view of a large number of address signal areas 1 and corresponding data recording areas 2 on the track T shown in FIG. FIG. 3(a) is a plan view of the track T, and FIG. 3(a) is a sectional view of the track T.

The concavo-convex structure 3 on the disk surface that expresses the address in the address signal area 1 and the guide track 4 that constitutes the data recording area 2 are cut in advance during the manufacture of the disk master,
They are copied one at a time by known standber techniques. A recording material is deposited on the address signal area 1 and data recording area 2 to form a recording layer 6. Information is recorded on the optical disk by heat mode recording by making holes in the recording layer 6 or causing changes in reflectance. A reproduced signal from the optical disc is read by changing the intensity of reflected light with respect to a low level optical power I below the photosensitive threshold of the recording layer 6. This situation is shown in FIG. 3(0). The address information in the address signal area 1 is detected as a reflectance change due to a diffraction effect corresponding to the uneven structure of the surface, whereas the recorded information in the data recording area 2 is detected as a reflectance change due to a change in the state of the recording layer. Therefore, the amplitude of these reproduced signals generally does not reach a positive level.

Below, as an example of heat mode recording, a method of locally raising the temperature of the recording layer 6 to change the optical characteristics of the recording material will be described.

There are known recording materials whose optical properties change reversibly and those whose optical properties change irreversibly. A record material whose optical properties change irreversibly is deposited on a write-once optical disk. The change in the optical properties of the recording layer 6 is caused by a state transition between an amorphous state and a crystalline state of the recording material based on a heating cycle of the recording material, or
This is done by utilizing state transitions between one amorphous state and another amorphous state. Next, the above state quantity transition will be explained in principle using a state transition between an amorphous state and a crystalline state as an example.

FIG. 4 shows a simplified model of state transition conditions in a recording material used in a rewritable optical disc. (see FIG. 4) indicates an amorphous state, and in the amorphous state of the recording material, the light reflectance is low and the transmittance is high. FIG. 40 shows a crystalline state, and in the crystalline state of the recording material, the light reflectance is large and the transmittance is small. In this recording material, when the temperature is raised to near the melting point in crystalline state C and then rapidly cooled, it changes to amorphous state A, and when the temperature is raised and slowly cooled in amorphous state A, it returns to crystalline state C. Therefore, reversible optical It is possible to change the physical characteristics. The recording material deposited on the optical disk is heated and slowly cooled in advance to become crystalline state C. The signal is recorded using crystalline LQC by heating and rapidly cooling the recording material in Figure 4.
This corresponds to a state transition from amorphous state A to an amorphous state A, and conversely, erasure of a recorded signal corresponds to a state transition from an amorphous state gA to a crystalline state C due to heating and slow cooling of the recording material.

FIG. 5 shows a simplified model of state transition conditions between an amorphous state and a crystalline state in a recording material used in a write-once optical disc. The recording material shown in FIG. 4 is in an amorphous state A.
When the temperature is raised by laser light, an irreversible state transition occurs in the crystalline BC, and information is recorded.

FIG. 6 is a waveform diagram of a reproduced signal based on a change in the amount of reflected light when a signal is recorded on a rewritable optical disc and a write-once optical disc. In the recording signal 100 of FIG. 6(a), the laser light intensity at pit "1" becomes a recording intensity higher than the photosensitive threshold of the recording material, causing a state change in the recording material, whereas the bit "o" Then, the light intensity of the laser becomes the reproduction intensity below the photosensitive threshold, and no state change occurs in the recording material. Φ) in FIG.

FIG. 6(C) shows a reproduction signal 102 from a write-once optical disc.
It has the same polarity as the recording signal 100. Due to the characteristics of the recording materials mentioned above, information recording and reproducing devices that are compatible with refillable optical discs and write-once optical discs are
In reproducing a signal from a data recording area of a rewritable optical disc, it is necessary to invert the polarity of the reproduced signal.

Patent application filed in 1973 as an optical information recording and reproducing device compatible with both replaceable optical discs and write-once optical discs.
There is one shown in No. 9-77931, but 1. In this device, compatibility is indicated only with regard to the reproduction of recorded information from the data recording area 2 in relation to the characteristics of the recording material.

Problems that the invention sought to solve However, in the optical information recording and reproducing apparatus disclosed in Japanese Patent Application No. 59-77931, when using an optical disc on which address information is preformatted as shown in FIG. After distinguishing between reproduction of address information from data recording area 2 and reproduction of recorded information from data recording area 2, it is necessary to distinguish between reproduction of address information from data recording area 2 and reproduction of recorded information from data recording area 2. This has the problem that the polarity of the reproduced signal must be reversed.

In view of this point, the present invention has been developed from address signal area 1 to
- By constantly reversing the polarity of only the reproduction signal from either the rewritable optical disc or the write-once optical disc, without distinguishing between the reproduction of the address information from the data recording area 2 and the reproduction of the recorded information from the data recording area 2. The object of the present invention is to provide an optical information recording and reproducing device that is compatible with the conventional optical information recording and reproducing apparatus.

Means for Solving the Problems The present invention provides a disc identification means for identifying whether a loaded optical disc is a rewritable optical disc or a write-once optical disc, and a disc identification means for identifying whether the optical disc installed is a rewritable optical disc or a write-once optical disc. The present invention is an optical information recording and reproducing apparatus equipped with a reproduction signal reversing means that constantly inverts the polarity of a reproduction signal from an optical disc without distinguishing between address information preformatted on an optical disk and recorded information recorded by the information recording means.

According to the above-described configuration, the present invention uses a rewritable optical disc and a write-once optical disc that are preformatted so that the address information in the address signal area has opposite polarity to each other, thereby producing a rewritable optical disc or a write-once optical disc. By always inverting the polarity only for the reproduced signal from either one of the rewritable optical discs and write-once optical discs, the address information from the address signal area and the recorded information from the data recording area are not distinguished. It will be compatible with

Embodiment FIG. 1 shows a block diagram of an optical information recording/reproducing apparatus in an embodiment of the present invention. In FIG. 1, 6 is an information recording medium that stores a rewritable optical disc or a write-once optical disc, and 6a identifies whether the original disc stored in the information recording medium is a rewritable optical disc or a write-once optical disc. 6b is an information recording area on the optical disk in which address information and recording information are recorded; 7 is a rewritable optical disk; 7 is a rewritable optical disk; A disc identification unit 8 identifies whether the disc is a write-once optical disc or not, and inverts the playback signal from the optical disc in the case of a rewritable optical disc based on the identification result of the loaded original disc, and also inverts the playback signal from the write-once optical disc. A playback signal inversion section that rotates in the normal direction; 9 an information erasing section that erases information recorded in the information recording area 6b when the loaded optical disc is a rewritable optical disc; 10 a sector that records, reproduces or erases information. The address input section 11 receives address information inputted from the outside, and detects address information included in the playback signal from the optical disk, and detects a match between this and the address information inputted from the outside, thereby recording or playing back information. A sector search unit searches for a target sector to be erased; 12 is a recording information input unit into which information to be recorded is externally input; 13 is an information recording unit that encodes and modulates recording information and records it in the target sector; 14 is a purpose An information reproducing section which reproduces information by demodulating and decoding a reproduction signal reproduced from a sector through a reproduction signal inversion section 8; 15 a reproduction information output section which outputs reproduction information to the outside; 103 a disc identification mark; 104 a reproduction information output section which outputs reproduction information to the outside; Disc identification information, 105 is a playback signal, 106 is playback data, 107
is address information, 108 is a sector detection signal, 109 is recording information, 110 is a recording signal, 111 is playback information, 112
is the erasure signal.

The operation of the optical information recording and reproducing apparatus configured as described above will be explained below. When the information recording medium 6 is loaded into the apparatus, the disc identification section 7 is provided in the disc jacket that houses the optical disc or the original disc. The mounted optical disc is identified by detecting a discrimination mark 103 for identifying the optical disc from the disc identification area 6a, and the disc identification information 104 is sent to the reproduction signal inverting section 8 and the information erasing section 9. When a rewritable optical disc is loaded, the reproduction signal inverter 8 uses the disc identification information 104 to detect the address information preformatted in the information recording area eb and the information recorded by the device itself from the optical disc. The initial setting is such that the polarity of the playback signal 105 is reversed to generate playback data, and when a write-once optical disc is installed, the polarity of the playback signal 106 is reversed to generate playback data. 0 is also initialized to
The information erasing unit 7 performs the following operations when a write-once optical disc is loaded.
By prohibiting the erasing operation from the disk identification information 104, erasure and destruction of information due to an erroneous erasing operation is prevented.

Next, a description will be given below of the operation when recording, reproducing and erasing information by this apparatus is performed in units of sectors within the information recording area 6b. First, the address of the target sector in which information is to be recorded/reproduced/erased is externally inputted to the address input section 10 and set as address information 107 in the sector search section 11 . On the other hand, disk identification information 104
The playback signal reversing unit 8 initialized by 8 inverts the polarity of the playback signal 106 played back from the information recording area 6b in the case of a rewritable optical disc, and corrects the polarity in the case of a write-once optical disc. By doing so, reproduced data 106 is generated and reversely outputted to the sector search unit 11. The sector search unit 11 detects a match between the address data included in the reproduced data 106 and address information input from the outside, and when they match, it determines that the target sector has been detected and generates a sector detection signal 10B.

At the time of information recording, information to be recorded is input from the outside to the recording information input section 12 and sent as recording information 109 to the information recording section 13. The information recording unit 13 encodes and modulates the recorded information 109 to generate a recorded signal 110,
Recording is performed in the target sector in the information recording area eb in synchronization with the sector detection signal 108. During information reproduction, the reproduction signal inverting section 8 inverts or forwards the reproduction signal 105 from within the information recording area 6b to generate reproduction data 106 and sends it to the information reproduction section 14. The information reproducing unit 14 extracts the information recorded by the information recording unit 13 from the reproduced data 106 in synchronization with the sector detection signal 10B, performs demodulation and decoding to generate reproduced information 111, and uses this as the reproduced information. It is output to the outside via the output section 16. When erasing information, the information erasing unit 9 generates the erasure signal 11 in synchronization with the sector detection signal 108 only if the optical disc loaded is a rewritable optical disc based on the disc identification information 104.
2 is generated, and the information recorded in the target safeter in the information recording area 6b is erased.

As described above, according to the present embodiment, there is provided a disc identification means for identifying whether an optical disc loaded in the apparatus is a rewritable optical disc or a write-once optical disc, and a disc identification means for identifying whether the optical disc loaded in the apparatus is a rewritable optical disc or a write-once optical disc. If the disc is a rewritable optical disc, it can be rewritten by constantly reversing the polarity of the playback signal without distinguishing between the preformatted address information included in the playback signal and the recorded information recorded by this device. Note that in this embodiment, in relation to the characteristics of the recording material, the reproduction signal unit 8 is capable of reproducing information compatible with both rewritable optical discs and write-once optical discs. The polarity of the signal is reversed, and the polarity of the reproduced signal from the write-once optical disc is reversed. Similar compatibility can also be achieved by reversing the polarity of the reproduced signal.0 As described in detail, according to the present invention, when preformatting information such as addresses, rewritable format An optical information recording and reproducing apparatus using a rewritable optical disc in which a concavo-convex pattern formed on an optical disc is an inverted pattern of the concavo-convex pattern formed on a write-once optical disc, and a write-once optical disc as an information recording medium. The playback system always inverts the polarity of the playback signal from either the rewritable optical disc or the write-once optical disc, thereby reproducing recorded information compatible with both the rewritable optical disc and the write-once optical disc. In addition, by collecting the erase operation when the optical disc in use is identified as a write-once optical disc,
Jcf;E, ;c"""9 - The practical effects of this function are great.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an optical information recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of a 7-ohm optical disc, and FIG. A plan view and a cross-sectional view of a track and a waveform diagram of a reproduced signal from this track during information reproduction. Figure 4 is a state transition model diagram between an amorphous state and a crystalline state of a recording material used in a rewritable optical disc. FIG. 5 is a state transition model diagram of a recording material used in a write-once optical disc, and FIG. 6 is a waveform diagram of a recording signal and a corresponding reproduction signal from a rewritable optical disc and a write-once optical disc. 6... Information recording medium, 6a... Disk identification area, 6b... Information recording medium, 7...
. . . Disc identification section, 8 . . . Reproduction signal inversion section, 9 . . . Information erasure section, 1o . . . Address input section, 11 . . . Sector search. Part, 12...
...Record information input section, 13... Information recording section,
14... Information reproducing section, 15... Reproducing information output section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 ni,,, 4-Page 4 - Data record area ゛Figure 3!・・A1λ-eup I-S, evening tribute j friend? - Data recording 4 top area 3... uneven structure 4 - internal track 5... recording layer Fig. 4 Fig. 6

Claims (2)

[Claims] (1) A write-once optical disc having a recording material whose optical characteristics change irreversibly on a disc substrate on which address information is preformatted, and a reverse polarity pattern preformatted as the same address information for the write-once optical disc. By using a rewritable optical disc having a recording material whose optical characteristics change reversibly on a disc substrate as an information recording medium, and detecting a disc identification mark provided on the optical disc or a disc jacket housing the optical disc. Disc identification means for identifying whether the optical disc loaded in the optical information recording/reproducing device is the write-once optical disc or the rewritable optical disc, and for both the write-once optical disc and the rewritable optical disc. an information recording means for recording information, and the disc identification means,
reproduction signal inversion means for constantly inverting a reproduction signal from either the rewritable optical disk or the recordable optical disk; information reproduction means for reproducing information from a signal generated by the reproduction signal inversion means; and the rewritable optical disk. information erasing means for erasing information recorded on the rewritable optical disc and the write once optical disc without distinguishing between preformatted address information and recorded information recorded by the information recording means. An optical information recording/reproducing device characterized in that the same information reproducing means is used for both. (2) The information erasing means prohibits the erasing operation based on the identification information generated by the disc identification means when the loaded optical disc is a write-once optical disc. optical information recording and reproducing device.