JP3186901B2 - Disc playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk for storing a plurality of disks such as compact disks and laser disks in a rotary tray, and discriminating and reproducing a selected disk among the stored disks. It relates to a playback device.

[0002]

2. Description of the Related Art FIG. 5 is a perspective view showing the structure of a rotary tray in a conventional disk reproducing apparatus. In FIG. 1, reference numeral 1 denotes a disk-shaped rotary tray mounted and rotated while a plurality of disks (not shown) are stored and held, and reference numerals 1a, 1b, 1c, 1d, and 1e denote concentric circles on the rotary tray. Disk storage portions arranged at equal intervals along the upper side for storing and holding disks, 2 is a peripheral portion of the rotary tray 1, 3, 4, and 5 are disk storage portions 1a and 1b on the rotary tray 1 at the peripheral portion 2. , 1
Disk number identification pattern grooves formed at locations corresponding to radial directions c, 1d, and 1e, respectively. Although not shown, corresponding disc grooves for disc number identification are also formed at locations corresponding to the disc storage sections 1c and 1d on the rotary tray 1 in the peripheral portion 2 in the radial direction. Each disk number identification pattern groove is formed by arranging a plurality of grooves in a pattern corresponding to the disk number as shown in the figure.

Therefore, when the disk having the disk number "2" is selected by operating the disk selection key (not shown), the disk number identifying pattern groove corresponding to the disk number "2" is set in advance. It is determined whether or not the detection is made within a certain time, and if the disc groove pattern groove is detected within this certain time, the rotary tray 1 is stopped based on the position where the disc groove pattern groove is detected. You. As a result, the disk with the disk number "2" is positioned so as to face a well-known disk reproducing mechanism including a turntable and a pickup, and is reproduced.

Next, the operation will be described with reference to the flowchart of FIG. FIG. 6 is a flowchart showing the operation of the disk number identification process of the disk reproducing device. In this disc number identification process, when the disc number of the disc to be reproduced is selected, the timer is started (step S1), and at the same time, the rotary tray 1 is rotated, and the disc number of the peripheral portion of the rotary tray 1 is identified. The pattern grooves 3, 4, and 5 are detected by a known optical detecting means, and a pulse signal is output from the optical detecting means. Here, it is determined whether or not a pulse for detecting a disk number corresponding to the selected disk number is detected (step S2), and no pulse for detecting a disk number is detected within a predetermined time set by the timer. Sometimes, the disc selection is determined to be invalid (step S6).

On the other hand, when a disk number detection pulse corresponding to the selected disk is detected in step S2, the disk number is identified based on the disk number detection pulse (step S4), and the disk to be reproduced is identified. The disk position of the selected disk is detected based on the point in time when the disk number matching the disk number is detected (step S5).

[0006]

The conventional disk reproducing apparatus is configured as described above. However, when the rotation speed of the rotary tray 1 fluctuates due to a change in temperature or a change in mechanical load over time, the disk reproduction apparatus is Accordingly, the pulse width and the cycle of the disk number detection pulse change. In addition, the rotation speed of the rotary tray 1 may vary depending on the disk reproducing device at the time of shipment, and in this case, there is a problem that a pulse for detecting a disk number cannot be detected. .

Further, the conventional disk reproducing apparatus has a problem that a complicated temperature compensation circuit and the like must be provided in order to stabilize the rotation speed of the rotary tray 1 so as not to fluctuate in response to a temperature change.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and even when a rotation fluctuation or a variation in rotation speed occurs in a rotary tray, a selected disk is reliably identified and selected. It is an object of the present invention to obtain a disk reproducing apparatus with improved reliability.

[0009]

SUMMARY OF THE INVENTION A disk reproducing apparatus according to the present invention includes a rotary tray on which a plurality of disks are mounted and which rotates, and discriminates and reproduces a selected one of the disks. At
A plurality of disk storage portions provided along the same circle concentrically on the rotary tray, and a pattern corresponding to each disk number at a position corresponding to each disk storage portion on a peripheral portion of the rotary tray. Disk groove identification pattern groove, a synchronization pulse generation groove formed between each of two adjacent disk number identification pattern grooves in the peripheral portion, the disk number identification pattern groove and the synchronization pulse Detecting means for optically detecting each of the generation grooves to output a disk number identification pulse and a synchronization pulse; and a disk number is determined based on the disk number identification pulse and preset disk number information. Control means for selecting a disc groove for disc number identification of the disc. The pattern groove for disc identification is formed by arranging single or plural grooves having the same width as the reference groove width of the minimum unit or a groove width of an integral multiple of the reference groove width to set each disk number. The groove for pulse generation is an integral multiple of the width of the reference groove, and is formed to have a groove width larger than the groove portion of any of the disk number identification pattern grooves. After a pattern formed in the disk number identification pattern groove is determined based on the ratio to the number identification pulse, the determined pattern is referred to as disk number information.

[0010]

According to the disk reproducing apparatus of the present invention, when the rotational speed of the rotary tray fluctuates or varies, the pulse width of the synchronous pulse obtained when the groove for synchronizing pulse generation is detected and the pulse width for detecting the disk number are detected. The pulse width of the obtained pulse changes in proportion to the rotation speed. For this reason, the ratio of the pulse width of the synchronization pulse to the pulse width of the disc number identification pulse is always constant irrespective of the fluctuation or fluctuation of the rotation speed of the rotary tray, and therefore, the fluctuation or fluctuation of the rotation speed of the rotary tray is not affected. The influence of the influence can be eliminated, and the selected disk can be selected accurately and surely, so that a disk reproducing device with high reliability against fluctuations in the rotation speed of the rotary tray can be obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a rotary tray in a disk reproducing apparatus according to one embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a disk-shaped rotary tray on which a plurality of disks (not shown) are mounted and rotates, and 1a, 1b, 1c, 1d, and 1e are arranged along the same circle concentric on the rotary tray 1. A disk storage section for storing and holding a disk, 2 is a peripheral portion of the rotary tray 1, 3, 4, and 5 are disk storage portions 1a, 1b, 1 on the rotary tray 1 at the peripheral portion 2.
Disk number identification pattern grooves formed at positions radially opposed to c, 1d, and 1e, respectively. Although not shown, a pattern groove for disc number identification corresponding to the disc storage portions 1c and 1d is similarly formed in the peripheral portion 2 of the rotary tray 1. The disk number identifying pattern grooves 3, 4, and 5 have a single or a plurality of groove portions formed of a pattern corresponding to the disk number, which will be described later in detail.

Reference numerals 6 and 7 denote grooves for synchronizing pulse generation. The grooves 6 and 7 for synchronizing pulse are formed between adjacent two disc number discriminating pattern grooves 3, 4, and 5 in the peripheral portion 2. They are formed at equal intervals. The grooves 6 and 7 for synchronizing pulse have a groove width that is an integral multiple of the groove of the pattern grooves 3, 4 and 5 for disk number identification, and the pattern grooves 3 and 4 for disk number identification. 5
The width is set wider than any of the grooves. Details of this will be described later.

FIG. 2 shows a detection circuit 10 for optically detecting the disk number identification pattern grooves 3, 4, 5 and the synchronization pulse generation grooves 6, 7. In the figure, 1
1 is a light emitting diode, 12 is a current limiting resistor of the light emitting diode 11, 13 is a phototransistor, and 14 is a load resistor connected to the collector of the phototransistor 13. Reference numeral 15 denotes a microprocessing unit 15, which includes an I / O port, a CPU, a RAM, and a ROM, and controls the entire disc reproducing apparatus.
The detection circuit 10 has a known configuration. That is, the light emitting diode 11 and the phototransistor 13 are provided at opposite positions on both sides of the peripheral portion 2, and the disk grooves 3, 4, and 5 or the synchronous pulse are generated with rotation of the rotary tray 1. When the light passes through the grooves 6 and 7, the light emitted from the light emitting diode 11 is received by the phototransistor 13, and a pulse having a pulse width corresponding to the light receiving time of the phototransistor 13 is input to the microprocessing unit 15.

FIGS. 3 (a) to 3 (d) are illustrations showing the disc groove discriminating pattern grooves 3, 4 and the synchronizing pulse generating grooves 6, 7. FIG. FIG. 13A shows the disk number “1”.
3 shows the pattern groove 3 for disc number identification and the groove 7 for synchronizing pulse generation.
The pattern groove 3 for disc number identification has a pattern configuration including one groove 21 having a reference groove width T as a minimum unit. Further, the synchronization pulse generating groove 7 is set to a shape having a groove width 5T which is five times the reference groove width T in this embodiment. Although not shown, the synchronization pulse generation groove 6 is set to have a groove width 5T that is five times the reference groove width T, similarly to the synchronization pulse generation groove 7.

FIG. 1B shows the disk number identifying pattern groove 4 and the synchronous pulse generating groove 7 of the disk number "2". The disk number identifying pattern groove of the disk number "2" is shown. 4 has a pattern configuration formed by one groove portion 22 having a groove width 2T twice the reference groove width T. FIG. 3C shows a disk groove numbering pattern groove of disk number "3" and a synchronization pulse generating groove 7. The disk number numbering pattern groove of disk number "3" is a reference groove. Width T
Is formed in a pattern configuration in which a pair of groove portions 24 and 25 having the following are arranged at intervals of the reference groove width T.

Similarly, FIG. 3 (d) shows a pattern groove for disc number identification of the disk number "4" and a groove 7 for synchronizing pulse generation. The pattern groove has a reference groove width T
A pair of grooves having a reference groove width T are arranged at both sides of one groove having a groove width 2T twice as large as the reference groove width T. The pattern groove for disc number identification of the disc number “5” is not shown, but is, for example, twice the reference groove width T so as to be easily assumed based on the pattern grooves of FIGS. A pair of groove portions having the groove width 2T and one groove portion having the reference groove width T are arranged at intervals of the reference groove width T. As described above, the groove 7 for synchronizing pulse generation is set to have a groove width 5T which is five times the reference groove width T in this embodiment. 3, 4 and 5 grooves 21 to
The groove width may be greater than any one of the reference groove widths 24, and may be an integral multiple of the reference groove width T.

The disk number identifying pattern grooves 3,
4 and 5, and grooves 6 and 7 for synchronizing pulse generation
The disk number information corresponding to the disk number identification pulse generated by the detection at
M, the microprocessing unit 15 of FIG. 2 performs a discriminating operation while referring to the table with respect to the disc number identification pulse input from the detection circuit 10, and reads out the disc number corresponding to the matching pattern. Select the disk corresponding to the read disk number.

Next, the operation of the disk number identification process will be described with reference to the flowchart of FIG. The flowchart shown in FIG. 4 shows a control process when the microprocessing unit 15 executes a program stored in the ROM.

First, when a disk to be reproduced is selected by a disk selection key (not shown), the rotary tray 1 starts rotating. Here, the microprocessing unit 15 first detects and generates the synchronization pulse generation grooves 6 and 7 by passing them between the light emitting diode 11 and the phototransistor 13 in the detection circuit 10 of FIG. Detection is performed based on the synchronization pulse input from the circuit 10 (step S11). In this case, the pulse signal having the widest pulse width among the pulse signals output from the detection circuit 10 is converted into the synchronization pulse generation groove 6,
7, and then the pulse width of the detected synchronization pulse is detected (step S12).

Next, it is determined whether or not the pulse width of the synchronization pulse detected in step S12 falls within a range of 2.5 to 10 times the reference pulse width corresponding to the reference groove width T (step S12). S13). This reference pulse width is
This is a value corresponding to the reference groove width T when the rotary tray 1 rotates at a preset reference rotation speed. As described above, the synchronization pulse generation grooves 6 and 7 are set to a groove width 5T that is five times the reference groove width T, so that when the rotary tray 1 rotates at the reference rotation speed, the reference pulse width Is detected as a pulse having a pulse width five times as large as The groove widths of the grooves 21 to 24 constituting the disk number identification pattern grooves 3, 4, and 5 are set to be equal to or an integer multiple of the reference groove width T as described above.

If it is determined in step S13 that the pulse width of the synchronization pulse does not fall within the range of 2.5 to 10 times the reference pulse width, it is determined that the rotational speed of the rotary tray 1 is extremely abnormal. Then, processing is performed to cope with the abnormal operation (step S19). This is to determine whether or not the fluctuation of the rotation speed of the rotary tray 1 is within the range in which the disc groove discriminating pattern grooves 3, 4, and 5 can be detected, and is mainly used in the adjustment step in the manufacturing process. This is a control process that is hardly performed during actual use.

On the other hand, when it is determined that the pulse width of the synchronizing pulse falls within the range of 2.5 to 10 times the reference pulse width T, the pulse width detected in step S12 is used as the pulse width of the synchronizing pulse in the RAM. (Step S14). This pulse width is 5T in this embodiment.
However, a pulse width of 1/5 of the pulse width may be calculated, and the calculated pulse width may be stored in the RAM.

Next, the pattern grooves for disc number identification 3,
A pulse signal generated by the detection circuit 10 optically detecting 4, 5 is detected as a disc number identification pulse (step S15). Then, the pulse width of the disc number identification pulse is compared with the pulse width of the synchronization pulse stored in the RAM to determine the ratio between the two (step S16). Therefore, each of the disk number identification pattern grooves 3, 4, and 5 is identified as a relative value based on the ratio between each pulse width of the disk number identification pulse generated thereby and the pulse width of the synchronization pulse. become.

As described above, the discrimination of the patterns of the disc number discriminating pattern grooves 3, 4, and 5 can be accurately performed without the influence of the fluctuation or variation in the rotation speed of the rotary tray 1. That is, when the rotation speed of the rotary tray 1 fluctuates from the reference rotation speed, the pulse width of the disk number identification pulse generated by the disk number identification pattern grooves 3, 4, 5 and the synchronization pulse generation grooves 6, 7 Since the pulse width of the synchronization pulse generated by the above both changes proportionally to the rotation speed of the rotary tray 1, the ratio between each pulse width of the disk number identification pulse and the pulse width of the synchronization pulse is always kept constant. Is done. Therefore, the microprocessing unit 15 can reliably detect the pattern formed in the disk number identification pattern grooves 3, 4, and 5.

Then, the microprocessing unit 15 identifies the pattern of the disk number identifying pattern grooves 3, 4, and 5 detected by referring to the disk number information stored in the ROM table (step S17). Then, the disc groove discriminating pattern grooves 3, 4, and 5 corresponding to the selected disc number are selected. After that, the microprocessing unit 15
Stops the rotary tray 1 on the basis of the point at which the above-described disc number identification pattern grooves 3, 4, 5 are selected, and reproduces the selected disc with respect to a disc reproducing mechanism unit such as a turntable or a pickup. Position it in a possible state. The rotation of the rotary tray 1 is stopped using a known means.

[0026]

As described above, according to the present invention, as described above, even if the rotational speed of the rotary tray fluctuates or the disc reproducing apparatus varies from the beginning, these effects are not affected. Since the pattern groove for disc number identification can be accurately and reliably detected by eliminating the disc groove, the reliability of the disc reproducing apparatus itself can be improved,
Further, there is an effect that a temperature compensation circuit or the like for stabilizing the rotation speed of the rotary tray can be omitted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a rotary tray of a disk reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a detection circuit for detecting a groove for generating a synchronization pulse and a groove for generating a pulse for selecting a disk in the disk reproducing apparatus according to one embodiment of the present invention;

FIG. 3 is an explanatory diagram showing a groove for generating a synchronization pulse and a groove for generating a pulse for selecting a disk, which are formed on a peripheral portion of a rotary tray of a disk reproducing apparatus according to an embodiment of the present invention;

FIG. 4 is a flowchart showing a disk number identification process in the disk reproducing apparatus according to one embodiment of the present invention.

FIG. 5 is a perspective view showing a rotary tray of a conventional disk reproducing apparatus.

FIG. 6 is a flowchart showing a disk number identification process in a conventional disk reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary tray 1a, 1b, 1c, 1d, 1e Disk storage part 2 Peripheral part 3,4,5 Disk number discriminating pattern groove 6,7 Synchronous pulse generation groove 10 Detection circuit (detection means) 21-24 Groove part T reference Groove width

Claims (1)

(57) [Claims] 1. A rotatable rotatable mounting a plurality of disks.
Equipped with a tally tray and selected from the discs
Disc playback devices that identify and play discs
Te, along concentric same on circle on the rotary tray
And a plurality of disk storage units provided in the peripheral tray of the rotary tray.
Putter corresponding to each disk number at the position corresponding to the storage section
Pattern grooves for disc number identification
And two disc numbers adjacent to each other at the periphery.
Synchronous pulse generation groove formed between each of the separate pattern grooves
And the disk number identifying pattern groove and the synchronous pallet.
Optically detect each groove for generating a disc
Detecting means for outputting a separate pulse and a synchronization pulse; and a disk preset with the disk number identification pulse.
The disc number is determined based on the number information.
The pattern groove for disc number identification of the disc
Control means, wherein the disk number identification pattern groove has a minimum unit reference
Single with the same groove width or an integral multiple of the reference groove width
Or multiple grooves can be used to set each disc number.
Made is made by the synchronization pulse generating grooves is an integer multiple der of the reference groove width
Therefore, any of the groove portions of the disc number identification pattern groove
The control means is configured to control the synchronization pulse and the disc number identification.
The disk number identification pattern based on the ratio to the separate pulse
After determining the pattern formed in the groove,
Configured to refer to the pattern as disk number information
A disk reproducing apparatus , characterized in that: