JP2000276732A - Data reading and reproducing device of optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the grasping of kinds of data easier, the reproduction of data simpler and the capacity of a recording medium larger by inclining the disk surface of the medium with respect to a horizontal plane. SOLUTION: The disk plane of a CD-ROM 10 is inclined at a prescribed angle with respect to the horizontal plane and the rotation of the CD-ROM around a spindle 11 is controlled by a drive controller. A laser beam emitting source 14 which irradiates the recording layer 13 of the CD-ROM 10 with a laser beam is so arranged as to irradiate the recording layer with the laser beam from the rear surface of the CD-ROM 10. Eight pieces of detectors 15 which detect the reflected waves of the laser beam reflected to the recording layer 13 of the CD-ROM 10 are arranged at equal angular intervals of 45 deg. concentrically with the circumference of the laser beam emitting source 14. The detectors 15 read the reflected waves corresponding to the data in the recording layer of the CD-ROM 10 by an octal notation according to on and off. The data are converted into numerical values in accordance with the signals detected by the detectors 15 and are converted according to the binary notation by a conversion circuit 16, to reproduce the data of the CD-ROM 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reading and reproducing data from an optical recording medium.

2. Description of the Related Art In recent years, recording media capable of high-density recording have become widespread and tend to be expanded. This optical recording medium changes the crystal state of the recording layer by irradiating a laser beam, and changes the reflectance of the recording layer due to such a state change by two.
The data is read out and played back by the binary notation. This optical recording medium is excellent in that overwriting with a single light beam is possible, and the optical system of the driving device is simpler than that of a magneto-optical recording medium.

The irradiation of reading or reproducing data on the optical recording or magneto-optical recording medium is performed by rotating the medium with slight vibration in a horizontal plane and aligning the medium with a track to be read on the medium. The laser head is moved and controlled by a rack, pinion mechanism, and servo motor in the radial direction of the medium, and the laser prism is displaced in the direction perpendicular to the surface of the medium, and the number of revolutions of the medium is controlled. The reality is that the reproduction accuracy of the data is improved, and it cannot be said that the driving device is simply a simple driving device. The present invention changes the idea of the conventional method, actively tilting the medium,
By detecting the direction of the reflected light corresponding to the data of the laser beam, the type of data can be grasped, the data can be easily reproduced, and the data reading / reproducing apparatus which can cope with the large capacity of the medium is marketed. The purpose is to provide.

In order to solve the above-mentioned problems, a specific invention is a data reading / reproducing apparatus for irradiating an optical recording medium with a laser and reading / reproducing recorded data. A detector for detecting the reflected wave of the laser light irradiated toward the disk surface of the optical recording medium is n-adic on the same circle centering on the laser emission source (however, 3
Number) corresponding to the n-ary notation, arranged at equal angular intervals, and based on the signals detected by these detectors, the read data are replaced with numerical values according to the n-ary notation.
3. A data reading and reproducing apparatus according to claim 1, further comprising a data reading / reproducing device provided with a circuit for converting this numerical value into a binary number, and eight detectors when said n-ary number is an octal number. If the reader and the n-ary system are decimal, 10
3. The data reading and reproducing apparatus according to claim 1, wherein the plurality of detectors are arranged, and the optical recording medium is a kind of CD-ROM / DVD.
According to another aspect of the present invention, there is provided a data reading device according to any one of 2, 3, and 4.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1 is a typical embodiment of the invention described in claims 1, 2, 3, and 5. In FIG. 1, reference numeral 10 denotes a CD-ROM which is a kind of optical recording medium.
10, the board surface is inclined at a predetermined angle with respect to the horizontal plane,
The rotation around the spindle 11 is controlled by a drive control device. Reference numeral 12 denotes a control circuit. A laser light source 14 for irradiating a laser beam to the recording layer 13 of the CD-ROM 10
Are arranged so that laser light is emitted from the back surface of the CD-ROM 10. A detector 15 for detecting a reflected wave of the laser light reflected on the recording layer 13 of the CD-ROM 10 is provided with a laser beam 45 concentrically around the circumference of the laser light source 14.
Eight are arranged at equal angular intervals. (See FIG. 2). These eight detectors 15 are the CDs irradiated with the laser light.
The detector 15 reads the reflected wave corresponding to the data in the recording layer of the ROM 10 in octal notation according to whether the detector 15 is on or off. Based on the signals detected by these detectors 15, a data conversion circuit 16 is provided for converting data into binary data after setting data in octal system. The data on the CD-ROM 10 is reproduced according to the converted signal. In this embodiment, eight detectors 15 are arranged as described above in accordance with the octal system. However, when the decimal system is employed as in the invention of claim 4, the detector 1 is used.
5 are arranged at equal angular intervals. When the n-ary system is used, the number of the detectors 15 is three or more and n units are arranged at regular angular intervals. Embodiment 2 A different point from Embodiment 1 is that the optical recording medium is a CD-R
A DVD 10a is used instead of the OM 10. The same reference numerals as those of the embodiment have the same function, and the data is separated into a video signal through the conversion circuit 16 and reproduced. The medium is not limited to the medium described in the first and second embodiments.
The present invention is also applicable to reproduction on a D (mini disk) or MO (magneto-optical) disk.

According to the first, second, third, fourth and fifth aspects of the present invention, data on an optical recording medium can be read and reproduced with a simple structure. In particular, according to the second aspect of the present invention, the data can be easily converted to n by the inclination of the disk surface in the medium, the laser light emitting sources arranged as described above, and their detectors.
It can be detected in binary and easily converted to data recognizable by the OS of the personal computer. Further, according to the third and fourth aspects of the present invention, the same effects as described above can be exerted without greatly increasing the number of detectors.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a first embodiment.

FIG. 2 is a plan view of a main part of FIG.

FIG. 3 is a schematic diagram of a second embodiment.

[Explanation of symbols]

 10. CD-ROM 11. Spindle 12. Control circuit 13. Recording layer 14. Laser light source 15. Detector 16. Conversion circuit

Claims (5)

[Claims] 1. An apparatus for irradiating a laser to an optical recording medium to read and reproduce recorded data, wherein the board surface of the optical recording medium is inclined with respect to a horizontal plane. 2. A detector for detecting a reflected wave of a laser beam emitted toward the surface of the inclined optical recording medium, the detector comprising an n-ary system (not less than a ternary system) on the same circle around the laser emission source. ) Are arranged at equal angular intervals, and based on the signals detected by these detectors, the read data is replaced with numerical values in accordance with the n-ary notation, and the numerical values are further converted into binary numbers. 2. A data reading and reproducing apparatus according to claim 1, further comprising a circuit for converting the data into a data. 3. The detector according to claim 1, wherein when the n-ary system is an octal system, eight detectors are arranged.
A data reading device as described. 4. When the n-ary system is a decimal system,
3. The data reading and reproducing apparatus according to claim 1, wherein the plurality of detectors are arranged. 5. The optical recording medium is a CD-ROM. DVD
5. The data reading device according to claim 1, wherein the data reading device is one of the following.