KR970001925B1 - Multi-disk player disk sensing apparatus and the method thereof - Google Patents

Abstract

The disc discriminating device of a multi-disc player installs an induction coil at a predetermined position of the interior of a front panel of the multi-disc player to thereby discriminate the type of disc by the generation of an induced electromotive force. The disc discriminating device of the multi-disc player having a tray(12) on which plural types of discs are mounted, comprises: an induced electromotive force generator(10) installed on a predetermined position of the interior of a front panel of the multi-disc player(1) to generate an induced electromotive force in accordance with the loading of the tray(12); an analog-digital converter(20) for converting the pulse voltage outputted from the induced electromotive force generator(10) into a digital signal; a counter(30) for counting the digital pulse signal; a reference data memory(40) in which comparison data is previously stored; and a microcomputer(50) for comparing the count signal from the counter(30) with the reference data stored in the reference data memory to thereby discriminate the type of disc.

Description

Disc Discrimination Device and Method in Multi Disc Player

1 is a block diagram of a disc discrimination apparatus in a multi-disc player according to the present invention.

FIG. 2 is a diagram showing a multi-disc player in a tray unloading state for explaining the installation position of the disc discrimination means shown in FIG.

FIG. 3 is a view showing a state in which the tray shown in FIG. 2 is loaded and the type of disc loaded in the tray.

FIG. 4 is a diagram showing the induced electromotive force generation relationship for each disc type shown in FIG.

5 is a flowchart for explaining a disc discrimination method by a disc discrimination apparatus in a multi-disc player according to the present invention.

* Explanation of symbols for main parts of the drawings

1: multi-disc player 10: induction electromotive force generating unit

12 tray 20 analog-to-digital converter

30: counter 40: reference data storage unit

50: microcomputer 60: playback mechanism

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc discrimination apparatus and method in a multi-disc player. In particular, an induction coil is installed at a predetermined position in a front panel of a magnet and a multi-disc player at a predetermined position of each mounting place of a tray on which a plurality of disks are mounted. The present invention relates to a disc discrimination apparatus and method in a multi-disc player in which faster playback is performed by discriminating the type of disc by a signal of an induced electromotive force in which the induction coil is magnetized and digitized in accordance with the tray loading.

Currently, a multi-disc player capable of reproducing various information discs having different dimensions such as a compact disc (CD) or a laser disc (LD), which is proposed as an information storage medium, is suitable for the type of disc by determining the size of such disc. As a reproducing operation is performed by data processing, an example of a method of determining the type of such a jack is a method of using a pickup device that reads data by irradiating a laser beam beam to a disc.

That is, when loading is performed while the disk is mounted on the tray, the pickup device moves to the outer peripheral end of the compact disk to irradiate the laser beam beam to detect the reflected light, and then moves to the position of the outer peripheral end of the laser disk to detect the laser beam beam. If the reflected light exists, it is discriminated by the laser disk, and when the reflected light is not detected, it is discriminated by the compact disc.

However, according to the disc type discrimination method by detecting the disc size using the above-mentioned pick-up device, the track access on the disc can be obtained from the time required for the pick-up device to move to the outer peripheral position of the disc or from the disc type determination point. There is a disadvantage that the playing time of the disc is considerably delayed, for example, because the transfer time to the TOC (Table of Content) area is consumed.

In addition, similarly to the above, there is a method of determining the type of the disc, and the operation according to the above is first set to the laser disc unconditionally at first, and when the loading is completed, the position of the pickup device is outside the compact disc having the diameter of 12 cm. It is set at the side and focusing is performed with the objective lens of the pickup device.

In this case, a laser disk having a diameter of 30 cm and a laser disk having a diameter of 20 cm can be accurately focused, but focusing is not performed when 8 and 12 cm diameter compact disks and disks are not mounted.

In the case of accurate focusing by the above-described focusing operation, that is, in the case of a laser disk having a direct line of 20 and 30 cm, the two laser disks have different outer diameters and weights. The moment is also distinguished by checking the period of the FG pulse detected by the frequency generator sensor (FG Sencer) of the spindle motor by driving the spindle motor by using a big difference. In other words, when a 30cm diameter laser disk with a large moment of inertia is mounted on a tray, the speed increases slowly compared to a 20cm diameter laser disk when the spindle motor accelerates, thus reaching a disk rotation speed of about 1800 rpm, where data can be read from the disk. Edo reaches slower than laser discs with a diameter of 20 cm.

In addition, the focusing operation was performed by placing the position of the pickup device outside the compact disk having a diameter of 12 cm, but if the correct focusing is not performed, the focus is checked by moving the pickup device to be located inside the compact disk having a diameter of 8 m. If it is not focused, it is determined that there is no disc. If it is focused, it is determined as a compact disc and moved to the TOC lead in area. The positions of the TOC lead-in area of the compact discs having a diameter of 8 cm and 12 cm are different from each other. Since it is wrong, discrimination is possible.

However, according to the disc type discrimination method, since the type of disc can be determined only through many paths, the fire time is very slow, and mechanical movements such as spindle motor start and pick-up device movement are necessary, so that the deck's durability and There is a problem with reliability.

Accordingly, the present invention has been made in view of the above circumstances, and an object thereof is to provide an induction coil at a predetermined position inside a front panel of a magnet and a multi-disc player at a predetermined position of each mounting place of a tray on which a plurality of disks are mounted. Disclosure of the Invention The present invention provides a disc discrimination apparatus and method in a multi-disc player in which faster playback is performed by discriminating the type of the disc by a signal of an induced electromotive force that magnetizes the induction coil according to loading.

In order to achieve the above object, a disc discrimination apparatus in a multi-disc player according to the present invention includes a tray on which a plurality of discs are mounted, and reads information from a disc mounted on the tray and reproduces the information through a reproducing mechanism. In the disc player, an induction electromotive force generating unit which is installed at a predetermined position on the tray and a predetermined position inside the front panel of the multi-disc player to generate different induction electromotive force according to the type of disc when the tray is loaded, and the induction electromotive force Analog-to-digital converter for digitally converting the pulse voltage by the induced electromotive force output from the generator, a counter for counting the digitally converted pulse signal, and reference data that can be compared with the pulse value counted in the counter for disc type determination Data base with pre-stored The reproducing mechanism is driven by comparing the count signal output from the counter and the reference data stored in the reference data storage unit to determine the type of disc, and outputting a regeneration control signal for accessing the disc. Provided is a disk discrimination apparatus in a multi-disc player having a microcomputer.

According to a preferred embodiment of the present invention, the induction electromotive force generating portion of the plurality of magnets and the multi-disc player is installed in the mounting place of the tray on which the plurality of disks are mounted and magnetized as the plurality of magnets pass by the loading of the trays; It consists of an induction coil installed inside the front panel.

In addition, the plurality of magnets are arranged in the same straight line and are configured to pass in turn while maintaining the guide coil and a predetermined vertical interval according to the loading.

In the disc discrimination method of the multi-disc player according to the present invention, as the tray is loaded, a plurality of magnets respectively installed at predetermined positions on the tray pass through an induction coil installed in the front panel to generate induction electromotive force. And a second step of digitally converting the generated pulse signal of the induced electromotive force and counting the converted pulse value, and ending the loading of the tray and comparing the counted count value with previously stored reference data. A third step of determining the type and a fourth step of accessing and reproducing the disc on the basis of the disc type determination state.

According to a preferred embodiment of the present invention, the third step is a first step of determining a laser disk having a diameter of 30 cm when the count value is 0, and a second step of determining a laser disk having a diameter of 20 cm when the count value is 1; If the Untz is 2, it comprises a third step of determining a compact disc having a diameter of 12 cm, and if the count is 3, a fourth step of determining that a compact disc having a diameter of 8 cm and a disc are not mounted.

Further, in the fourth step, it is determined whether or not focusing is performed, and when the focusing is performed, a compact disk having a diameter of 8 cm is determined, and when the focusing is not performed, it is determined that the disk is not loaded in the tray.

As described above, according to the present invention, it is possible to digitally convert the induced electromotive force of the pulse component generated by the induction electromotive force generation unit according to the tray loading and determine the type of the disc as a count signal that counts the converted pulse value.

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail.

1 is a block diagram of a disc discrimination apparatus in a multi-disc player according to the present invention, in which reference numeral 10 denotes a compact disc having a diameter of, for example, 8 and 12 cm, and a laser disc having a diameter of 20 and 30 cm, for example. An induction electromotive force generation unit which is installed at a predetermined position on the tray 12 and in a predetermined position inside the front panel of the multi-disc player 1 to generate induction electromotive force according to the loading of the tray 12, and the induction electromotive force generation unit 10 As shown in FIG. 2, the magnets A, which are arranged in a line with each other at a mounting location of the tray 12 on which the plurality of disks are mounted, that is, a mounting location of a disk having a diameter of 12, 20, and 30 cm, are provided. B, C) and induction coil K installed at a predetermined position inside the front panel of the multi-disc player 1 which is not affected by the loading of the tray 12, while maintaining the predetermined upper and lower intervals of the tray 12 loading. Based on the above mag The agent (A, B, C) is configured to pass through the induction coil (K) in turn.

When the tray 12 is loaded as shown in FIG. 3, the induction electromotive force generating unit 10 passes through the induction coil K when the magnets A, B, and C on the tray 12 are loaded. Each time the induction coil K is magnetized to generate an induction electromotive force of a pulse component.

Reference numeral 20 denotes an analog-digital converter for digitally converting the pulse voltage output from the induced electromotive force generation unit 10. Preferably, pulse position modulation is performed to change the generation position of the pulse according to the modulation signal. (Hereinafter referred to as PPM), and the pulse signal digitally converted through the analog-digital converter 20 is generated as two pulse signals in the case of a compact disc having a diameter of 12 cm, as shown in FIG. One pulse signal is generated in the case of a 20cm laser disc, and no pulse signal is generated in the case of a laser disc of 30cm in diameter, and three discs are not mounted on the tray 12 and a compact disc of diameter 8cm. Since a pulse signal is generated, it can be seen that each disc has unique characteristics.

According to a preferred aspect of the present invention, reference numeral 30 is a counter for counting pulse signals digitally converted by the analog-digital converter 20, and 40 is a pulse value counted by the counter 30 to determine the disc type. The reference data storage unit, in which reference data as comparison data that can be stored, is stored in advance, for example, is composed of an EEPROM.

In addition, the reference numeral 50 compares the count signal output from the count 30 with the reference data stored in the reference data storage unit 40 while controlling the operation of the entire apparatus, and determines the type of the disc. A microcomputer outputs a playback control signal for accessing the microcomputer, and 60 denotes a playback mechanism for accessing the disk according to the playback control signal output from the microcomputer 50 to perform the playback operation.

The disc discrimination method by the disc discrimination apparatus in the multi-disc player according to the present invention configured as described above will be described based on the flowchart of FIG.

Once, in step 500, the user loads the desired disk in the tray 12 and then loads the tray 12, in step 510, each mounting place of the tray 12 constituting the induction electromotive force generating unit 10 Magnets (A, B, C) installed in the pass through the induction coil (K) installed in the front panel of the multi-disc player (1) is generated induction electromotive force.

Subsequently, in step 520, the analog-to-digital converter 20 digitally converts the induced electromotive force of the pulse number component output from the induction electromotive force generator 10 by the PPM method, and at step 530, the counter 30 performs the digital conversion. The pulse signal to be converted is counted.

Thereafter, in step 540, the microcomputer 50 determines whether the loading of the tray 12 has ended. If the loading of the tray 12 is not finished, the microcomputer 50 returns to the step 500, whereas the tray has returned. When the loading of (12) is completed and the disc is seated on the turntable (not shown), the microcomputer 50 compares the count signal from the counter 30 with the comparison data stored in the reference data storage unit 40 to determine the size of the disc. The microcomputer 50 determines whether the count signal from the counter 30 is 0. In step 560, the microcomputer 50 determines the reference data. The comparison data stored in the storage section 40 determines that the disk seated on the turntable is a laser disk having a diameter of 30 cm.

On the other hand, when the count signal from the counter 30 is not 0, the microcomputer 50 determines whether the count signal from the counter 30 is 1 in step 570. At 580, the microcomputer 50 determines that the laser disk having a diameter of 20 cm is seated on the turntable.

In contrast, when the count signal from the counter 30 is not 1, the microcomputer 50 determines whether the count signal from the counter 30 is 2 in step 590. At 600, the microcomputer 50 determines that a compact disc having a diameter of 12 cm is currently mounted on the turntable, whereas if the count signal from the counter 30 is not 2, that is, the counter signal is 3, at step 610 The microcomputer 50 determines that a compact disc having a diameter of 8 cm is seated on the turntable or there is no disc.

Then, in step 620, the microcomputer 50 determines whether focusing is performed by a pickup device (not shown). If the focusing is not performed as a result of the determination, the microcomputer 50 determines in step 630 that there is no disk. In the case of focusing, a compact disc having a diameter of 8 cm is currently placed on the turntable.

Thereafter, in step 650, the microcomputer 50 outputs the playback control signal for the disc access, and the playback mechanism 60 performs the playback operation accordingly.

According to the disc discrimination apparatus and method in the multi-disc player according to the present invention as described above, the disc as a count signal that digitally converts the induced electromotive force of the pulse component generated in the induction electromotive force generation unit according to the tray loading and counts the converted pulse value. Since it is possible to determine the type of the disc, it is possible not only to discern the type of the disc in the process of loading the tray compared to the conventional pattern, but also a circuit problem, that is, comparing the laser discs of 30 cm in diameter and 20 cm with inertia moments. In this case, the circuit time constant switching problem and mechanical problem, that is, the TOC lead in position of the laser disc and the compact disc are different, and therefore, the initial position setting of the pickup device is incorrect. This becomes possible.

In addition, according to the present invention, the additional mechanism operation according to the disc type discrimination is unnecessary, which improves the durability and reliability of the deck, and also affects the external environment because the magnet and the coil are used to determine the disc type. It is a simple structure that does not receive the advantage that there is no fear of failure.

Claims (5)

In a multi-disc player (1) having a tray (12) on which a plurality of discs are mounted and reading information from the disc mounted on the tray (12) and playing back through the playback mechanism (60), a plurality of discs And a plurality of magnets (A, B, C) installed in the mounting place of the tray 12, the inside of the front panel of the multi-disc player (1) is mounted according to the loading of the tray 12 Induction electromotive force generation unit 10 consisting of an induction coil (K) that magnetizes as the magnets A, B, and C pass and generates a pulse signal, and a pulse by the induction electromotive force output from the induction electromotive force generation unit 10. Analog-to-digital converter 20 for digitally converting voltage, counter 30 for counting the digitally converted pulse number signal, reference data that can be compared with the pulse value counted in the counter 30 for disc type determinationThe reference data memory 40 and the count signal output from the counter 30 and the reference data stored in the reference data memory 40 to determine the type of disc and determine the type of disc. And a microcomputer (50) for outputting a playback control signal for accessing the disk to drive the playback mechanism (60). According to claim 1, wherein the magnets (A, B, C) are arranged in the same straight line to each other configured to pass through the induction coil (K) while maintaining a predetermined vertical interval with the loading of the tray 12 Disc discrimination apparatus in a multi-disc player, characterized in that. As the tray 12 is loaded, a plurality of magnets A, B, and C respectively installed at predetermined positions on the tray 12 pass the induction coil K installed in the front panel to generate induced electromotive force. Step 1 and a second step of digitally converting the number of pulse signals of the induced electromotive force generated in the induction coil (K) and counting the converted pulse value, and the loading of the tray 12 is finished and the count is completed. And a fourth step of determining the type of the disc by comparing the count value with previously stored reference data, and a fourth step of accessing and reproducing the disc based on the disc type discrimination state. Discrimination method. The method of claim 3, wherein the third process comprises determining the laser disk having a diameter of 30 cm when the count value of the pulse signal of the induction coil K is 0, and the pulse signal of the induction coil K. A second step of determining a laser disk having a diameter of 20 cm when the count value is 1; a third step of determining a compact disk having a diameter of 12 cm when the count value of the pulse signal of the induction coil K is 2; And a fourth step of determining that the compact disk having a diameter of 8 cm and the disk are not mounted when the count value of the pulse signal of K) is three. 5. The method as set forth in claim 4, wherein the fourth step determines whether or not to focus and determine that the disk is 8 cm in diameter when focusing, and that the disk is not mounted in the tray 12 when focusing is not performed. Disc discrimination method in a multi-disc player, characterized in that configured.