JPH07121969A - Disk reproduction device - Google Patents

Abstract

PURPOSE:To positively select and reproduce a selected disk and to improve reliability by positioning the selected disk to a specific position based on the pattern for detecting a disk number and that for a detection rotation stop position. CONSTITUTION:Positioning is performed in the title disk reproduction device by first detecting '1, 0' of an initial start bit 21, a succeeding pattern 22 for detecting a disk number consisting of three bits, and then one bit of a next space bit 23 and a stop bit 24. In this case, strobe points P0-P5 with a specific repetition period according to the peripheral speed of a disk tray are generated from the time when the first start bit 21 is detected, thus causing each bit to be detected. When the selected number agrees with the disk number of three bits, P5 stops at a position of 1/2 bit which is the detected number.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus for accommodating a plurality of compact discs, laser discs, etc., and reproducing a disc selected from the compact discs, laser discs, etc. accommodated therein. It is a thing.

[0002]

2. Description of the Related Art FIG. 2 is a conceptual diagram showing the structure of a conventional disc reproducing apparatus. In the figure, 1 is a disc tray, 1a, 1b, 1c, 1d and 1e are disc trays 1.
It is a disk mounting portion formed on the above. Reference numeral 2 denotes a disc number detection pattern and a rotation stop position detection pattern for positioning the disc mounted in the disc mounting portion 1c at a predetermined position when the disc mounted in the disc mounting portion 1c is selected. Similarly, 3 is a disc number detecting pattern and a rotation stop position detecting pattern for positioning the disc mounted on the disc mounting portion 1d at a predetermined position. Disk mounting part 1a, 1
Similarly, b and 1e are provided with a disk number detecting pattern and a rotation stop position detecting pattern correspondingly.

FIG. 3 is an explanatory view showing the disk number detecting pattern and the rotation stop position detecting pattern. In FIG. 3, 4 shows the rotation stop position detecting pattern and 5 shows the disk number detecting pattern. # 1 to # 5
Is a disk number and is the disk mounting portion 1a shown in FIG.
1e to 1e, respectively. Further, for example, the rotation stop position detecting pattern 4 corresponding to the disk number # 5 includes the rotation stop position detecting protrusions 4a, 4b, 4c and the rotation stop position detecting grooves 4d, 4e, 4f, 4 formed therebetween.
g, and the disk number detecting pattern 5 has disk number detecting protrusions 5a, 5b, 5c, 5
d and the disc number detecting groove 5 formed therebetween
e, 5f, 5g, 5h, 5i, and the widths of the rotation stop position detecting projections 4a, 4b, 4c and the disk number detecting projections 5a, 5b, 5c, 5d are different.

Returning to FIG. 2, 11 is an optical pickup,
Reference numeral 12 is a reproduction signal processing section for reproducing a signal detected by the optical pickup 11, and 13 is an optical disk for detecting a disc number detecting pattern and rotation stop position detecting patterns 2 and 3 formed on the peripheral portion of the disc tray 1. It is an optical pattern detecting element for detecting. Reference numeral 14 is a motor for rotating the disc tray 1, and 15 is a motor 1.
4 is an amplifier circuit for amplifying the drive signal of No. 4 and supplying it to the motor 14. Reference numeral 16 is a system control circuit for controlling the entire disc reproducing apparatus, 17 is a deceleration / braking signal generator for generating deceleration and braking signals for the motor 14, and 18 is motor 1
4 is a drive signal generation unit that generates a drive signal for driving No. 4. Reference numerals 19 and 20 are disk selection keys.

In this disc reproducing apparatus, the disc mounting portion on which the disc corresponding to the disc number selected by the disc selection keys 19 to 20 is mounted is identified based on the disc number detecting pattern and the rotation stop position detecting pattern. The disc with the selected disc number is positioned at a predetermined position and played. In this case, the detection of the disc number detection pattern and the rotation stop position detection pattern depends on the width of the disc number detection protrusion and the disc number detection groove, and further the rotation stop position detection protrusion and the rotation stop position detection groove. A predetermined disk number is selected by detecting the magnitude and the number of pulse widths that are output.

[0006]

The conventional disc reproducing apparatus is constructed as described above, and despite the fact that the widths of the disc number detecting projection and the rotation stop position detecting projection are not constant, When the number of revolutions of the disc tray 1 fluctuates with respect to a preset number of revolutions, the magnitude of the pulse width changes, which makes it difficult to detect and identify the disc number detection pattern and the rotation stop position detection pattern. There has been a problem that it is difficult to reliably select and play a disc.

The present invention has been made to solve the above-mentioned problems, and it is possible to reliably select and reproduce the selected disc regardless of the fluctuation of the rotation speed of the disc tray. It is an object of the present invention to provide a disc reproducing device with improved performance.

[0008]

DISCLOSURE OF THE INVENTION A disc reproducing apparatus according to the present invention has a disc tray on which a plurality of discs are mounted and which rotates, and reproduces a disc selected from the discs mounted on the disc tray. In the disc reproducing apparatus to be configured in a part of the disc tray,
A disc number detecting pattern formed by a groove or a protrusion having a width that is an integral multiple of a predetermined value for identifying the selected disc mounting position, and the disc number detecting pattern are provided corresponding to the disc number detecting pattern. A rotation stop position detection pattern constituted by a groove and a protrusion having a width that is an integral multiple of the predetermined value for stopping the rotation of the disc tray at a predetermined position, and the disc number detection pattern and the rotation stop position detection Pattern detecting means for detecting a pulse pattern and outputting a pulse signal, and positioning the selected disk at a predetermined position based on the disk number detecting pattern and the rotation stop position detecting pattern detected by the pattern detecting means. And a disk positioning means for performing the same.

[0009]

The disk reproducing apparatus according to the present invention has a disk number detecting pattern formed by a disk number detecting groove or a disk number detecting protrusion having a width obtained by multiplying a predetermined value by an integer, and a predetermined value similar to the above. Based on a rotation stop position detection groove or a rotation stop position detection pattern having a width that is an integer multiple of the rotation stop position detection pattern, based on positioning the selected disk at a predetermined position, The disc number detecting pattern and the rotation stop position detecting pattern can be reliably detected and discriminated regardless of the change in the number of revolutions of the disc tray, and the selected disc can be surely selected and reproduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. For the configuration of the disc reproducing apparatus of this embodiment, refer to FIG. FIG. 1 is an explanatory diagram showing the configuration of a disc number detecting pattern and a rotation stop position detecting pattern formed on the peripheral portion of the disc tray 1 in the disc reproducing apparatus of this embodiment. In the figure, # 1 to # 5 indicate disk numbers, 21 is a 2-bit start bit composed of "1,0", and indicates the start positions of the disk number detection pattern and the rotation stop position detection pattern. There is.
Reference numeral 22 is a disc number detecting pattern, which is binary coded by 3 bits. Reference numeral 23 is a space bit of "0", 24 is a 2-bit stop bit composed of "1,1", and shows the end positions of the disk number detection pattern and the rotation stop position detection pattern. The disk number detecting pattern and the rotation stop position detecting pattern are composed of a total of 8 bits including a start bit 2 bits, a disk number detecting pattern 3 bits, a space bit 1 bit and a stop bit 2 bits.

In the positioning of the selected disc in this disc reproducing apparatus, first, "1,0" of the start bit 21 is detected, and further the disc number detecting pattern 22 of 3 bits is detected, and further, This is performed by detecting 1 bit of the space bit 23 and stop bit 24. In this case, the first start bit 21
From the time of detection, the strobe points P0 to P5 of a predetermined repeating cycle corresponding to the peripheral speed of the disc tray 1 are detected.
Occurs, and each bit is detected. If the selected number and the detected 3-bit disc number match, P5 stops at the position of the detected number, 1/2 bit.

As described above, in the present embodiment, the disk number detecting pattern and the rotation stop position detecting pattern are coded with 8 bits, and the selected disk is positioned by detecting this. Regardless of the number of rotations of the disc tray, as long as the number of rotations does not change, the selected disc can be surely selected, stopped at a predetermined stop position, and reproduced.

[0013]

As described above, according to the present invention, there is provided a highly reliable disc reproducing apparatus capable of surely selecting and reproducing the selected disc number irrespective of the fluctuation of the number of revolutions of the disc tray. You can get it.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing configurations of a disc number detecting pattern and a rotation stop position detecting pattern formed on a peripheral portion of a disc tray in a disc reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a configuration of a conventional disc reproducing apparatus.

FIG. 3 is an explanatory diagram showing configurations of a disc number detecting pattern and a rotation stop position detecting pattern in a conventional disc reproducing apparatus.

[Explanation of symbols]

 1 Disc Tray 13 Optical Pattern Detection Element (Pattern Detection Means) 17 System Control Section (Disc Positioning Means) 22 Disc Number Detection Pattern

Claims (1)

[Claims] 1. A disc reproducing apparatus for reproducing a disc selected from among the discs mounted on the disc tray, the disc reproducing device having a disc tray for rotating a plurality of discs. The disc number detection pattern constituted by a groove or protrusion having a width that is an integral multiple of a predetermined value for identifying the mounting position of the selected disc, and the disc number detection pattern, respectively. A rotation stop position detecting pattern formed by a groove and a protrusion having a width that is an integral multiple of the predetermined value and provided to stop the rotation of the disc tray at a predetermined position, and the disc number detecting pattern and the rotation. Pattern detection means for detecting the stop position detection pattern and outputting a pulse signal, and detection by the pattern detection means A disk reproducing device comprising: a disk positioning means for positioning a selected disk on a predetermined position based on the disk number detecting pattern and the rotation stop position detecting pattern.