KR920005211B1 - Compact disc player - Google Patents

Abstract

The CPU of the apparatus finds the target disk utilizing photo intrrupter and preset home position and detects the existancy of a disk utilizing an additional photo-interrupter depositing one side of wing of a carrousel. The circuit includes a CPU (1), a motor driver (MD) for rotating the carrousel, a carrousel (CARR) for inserting compact disks, a sensor (3) for detecting the rotation or the stop of the CARR, a transmitter (5) for transmitting signal of the sensor (3) to the CPU (1), and LED (LED) for displaying the signal. Slots (S,S') are formed at wing of the CARR (2) ann are detected by photo interrupters (S1-S3). A photo interrupter (S4) is deposited at one side of the CARR to detect the existancy of compact disk in the slot.

Description

Multiple Compact Disc Location Access

1 is a schematic configuration diagram of a multi-compact disk position access device according to the present invention;

2 (a) is a schematic configuration diagram of an optical intern (S1-S3) of the present invention,

Figure 2 (b) is a front view showing the arrangement of the CARR, the home position portion and the disk presence inspection,

2 (c) is a side view showing the same arrangement as in FIG. 2 (b),

2 (d) is a detailed view showing a positional relationship between a home position and a slot;

3 is a circuit diagram of a circuit portion of the present invention;

4 (a) is a signal waveform diagram of a slot and an optical interrupter of the present invention,

4 (b) is a signal waveform diagram of a TTL gate of a circuit portion of the present invention;

5 (a) is a control diagram when finding a home position of the present invention.

5 (b) is a control diagram for finding the corresponding disk of the present invention.

* Explanation of symbols for main parts of the drawings

1: CPU 2: CARR

3: sensor part 4: wing part

5: circuit part 6,7: home position part

8,9: Disk presence inspection unit 10,10 ': PCB

12 disc 13 support

S1-S4: Optical Interrupter S, S ': Slot

SO1-SO4: Signal

The present invention relates to a device for accessing a location of a compact multi-disc, and more particularly, to installing a multi-compact disc on a single carrousel. By detecting the signal generated from this, it controls the search for a specially designated disc, installs an additional home position, indexes each disc, and also has a separate reflective interrupter In a multi-disc player of a multi-compact disc player that can be detected, a disk holder, that is, a circular turning shelf in the present invention, rotates. As an important problem to be solved, the disk on the rotating circular shelf is accurately measured. You can quickly find the disc you want without vibration, Is it possible to prevent the vibration of a disc player body and to access the desired disc quickly and accurately even if the disc's position on the circular turning shelf is biased to one side due to the inertia of rotational inertia or slipping due to other factors It was a task to be solved.

As a means for solving such current technical problems, the present invention is a CPU, a motor drive, a motor and a circular rotating lathe rotated by the motor (hereinafter referred to as "CARR" for CARROUSEL), the rotation and stop state of the CARR It is composed of a sensor unit for sensing, a circuit unit for combining the signals sensed by the sensor unit and delivering them to the CPU, and LEDs for displaying the respective signal states.

0.5로 하고 그 비임을 슬롯의 단부에서 감지되도록하여 정확도 높은 다중 디스크 억세스장치를 제공하는 것이다.An object of the present invention is to provide a noiseless, semi-permanent design by forming slots in the wing of the CARR and using an optical interrupter in the sensor unit, and by specially defining the home position, the CPU determines the position of the desired disk. The reference value is provided to calculate the direction quickly and calculate the

0.5 and the beam is sensed at the end of the slot to provide an accurate multiple disk access device.

It is still another object of the present invention to provide an access device for multiple disks which can perform a more intelligent process of determining whether or not a disk exists in the CARR by installing another optical interrupter on one side of the top of the CARR.

Hereinafter, a multi-compact disc position access apparatus of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a multi-compact disk position access device of the present invention. As shown in this figure, the CPU 1 can locate a desired disk via an external (RS232, RS485) or internal key pad. Upon receiving the command to select-of course, the first time the compact disc player is switched on, the CPU (1) automatically rotates the CARR (2) to remember its position for each disc relative to the home position and then automatically stops at the home position. The motor (DC motor) is driven, and at this time, the optical interrupters S1-S4 in the sensor unit 3 detect a signal by the slots S and S 'installed in the upper blade 4 of the rotating CARR. When the circuit unit 5 assembles the signal detected by the sensor unit 3 and transmits the signal to the CPU 1, the CPU 1 finds the position of the disk by comparing previously stored information with newly input information.

FIG. 2 (a) is a schematic configuration diagram of the optical interrupter S1-S3 used in the present invention, and FIG. 2 (b) is a view of the home position portions 6 and 7 and the presence / absence inspection portions 8 and 9 of the CARR. Fig. 2 (c) is a side view showing the arrangement of Fig. 2 (b), and Fig. 2 (d) is a position of the home positions 6 and 7 and the slots S and S '. Detailed diagram showing the relationship.

A circuit as shown in FIG. 3 is inserted into the PCB 10 shown in FIG. 2 (b), and in particular, as shown in FIGS. 2 (c) and (d), the optical intern interrupter S1. -S3) is inserted such that the grooves are arranged in parallel, and the grooves are fixed so as to fit in the wing of the lower end of the CARR. As shown in FIG. 2 (d), slots S and S 'are formed at the top of the lower portion of the CARR, and two optical interrupters S2 and S3 are beamed at both ends of the slot S'. (4-1) is installed to pass, the other optical interrupter (S1) is to be installed so that the beam (4-1) passes in a separate slot (S).

According to FIG. 2 (d), slots S 'should be formed for each part that can be fitted to the top of the CARR, and a separate small slot S is a method for indicating the home position. Since it cannot be fitted, it can naturally be formed by taking a wide portion between the slots S '. In other words, it becomes the position of the support 13 which supports the upper and lower sides of CARR.

In FIG. 2 (b) and FIG. 2 (c), another optical interrupter S4 capable of inspecting the presence or absence of the disk 12 is fixed to the PCB 10 'and installed perpendicular to the CARR.

The signals sensed by the optical interrupts S1, S2, S3, S4 shown in FIGS. 1 and 3 are transistor-transistor-logical gates (hereinafter referred to as TTL gates), as shown in FIG. The outputs are combined by the OR and AND circuits (SO1-SO4).

Next, referring to FIG. 3, FIG. 4 and FIG. 5 (a), a method and control of finding a home position will be described.

When the apparatus of the present invention is first set and the power switch is turned on, the CPU 1 first rotates the CARR 2. At this time, the slot S specially installed by the first design is found. When the CARR 2 rotates, the timing diagram as shown in FIG. 4 is obtained by the TTL gates OR, AND1, AND2, and3 of the circuit portion. Positionally, it is a position similar to that of Fig. 2 (d) (that is, when S2 and S3 are located in one slot S 'and S1 is located in a separate slot S). As shown in FIG. 4, all of S1, S2, and S3 become "High", and output SO2 is output to output the "High" level. In this case, only one position in the circumference of the upper edge of the CARR is called the home position.

In the apparatus of the present invention, when the SO1 signal is detected by the CPU 1 while the CARR is rotating, the SO1 new hole is detected and the speed is reduced every n times (1-5 in Fig. 5 (a)). Finally, as soon as 4n is reached, as soon as it detects the signal SO1, it decelerates again by 4n (SO4), which proceeds back to its home position. (6-10 of the fifth (a)). In consideration of this worst case, as shown in the point A of FIG. 5 (b), the signal SO2 is detected by finding the slots S and S 'once again. In the most normal case of the device, 5, 9 and 10 in the interval 4 of FIG. 5 (a) are designed to be stopped immediately when the signal SO1 is input without being affected by the rotational inertia of the CARR.

Next, with reference to FIGS. 4 and 6 (b), how the apparatus of the present invention finds the disk 12 will be described.

When using the apparatus of the present invention, the user decides internally when the desired disk 1n is determined, and the CPU 1 judges internally and decelerates the speed from -5n (1 in FIG. 5 (b)). 1-5). Therefore, when the position of the disk to be searched, namely 1n, is reached, the stop operation is performed with the same concept of finding the home position.

Among the optical interrupters S1-S4 as shown in Figs. 2 (a), (b), (c) and (d), the three optical interrupters S1-S3 are slots S, S 'through And another optical interrupter (S4) is a surface reflection type. Therefore, as shown in FIG. 2 (b), the optical interrupter S4 of the PCB 10 'installed on the side of the CARR is a surface reflection type, and when the CARR rotates, the signal SO1 is compared in synchronism with the signal SO4. It is judged whether or not the disk 12 is present.

0.5로 하고, 그 비임을 슬롯(S')의 단부에서 감지되도록하여(제2(d)도) 더욱 정밀도를 높혔으며, CARR(2)의 측면에 광인터럽터(S4)를 추가 설치하여 CARR(2)내에 디스크(12)의 유무를 판별할 수 있도록 하여 보다 지능적인 처리를 가능하게 하고 있다.As described above, the multi-layer disc position access apparatus of the present invention provides a reference value for calculating the position of the desired disc 12 in the CPU 1 and providing a quick orientation by specifying a home position in the apparatus. The control prevents sudden stop of the main body when stopping by control, and provides the function of fine adjustment device, and the disc 12 in CARR 2 is eccentric due to uneven rotational inertia or slip due to other factors. Disk access was facilitated even when generated, and a slotless (S, S ') and optical interrupters (S1-S4) were used in the apparatus of the present invention to achieve a noiseless and semi-permanent design. Especially the beam diameter of the optical interrupter

0.5, the beam is sensed at the end of the slot S '(second (d)) to further increase the accuracy, and an additional optical interrupter (S4) is installed on the side of the CARR (2) CARR ( 2) It is possible to discriminate the presence or absence of the disc 12 in the inside, thereby enabling more intelligent processing.

Therefore, the CPU 1 used in the multiple disk position access device of the present invention can not only store the position of each disk 12, but also the actual existence of the disk 12 in the corresponding slots S and S ', and the disk. In case of finding (12), it performs efficient functions such as quick direction selection centering on semi-circle.

Claims (6)

Sensor unit for detecting the rotation and stop state of the CARR (2) and the CARR (2) rotated by the CPU (1), the motor drive (MD), the motor (M) and the motor (N) in a multiple compact disc player ( 3) The multi-compact disk position access device, comprising a circuit unit 5 for combining the signals sensed by the sensor unit 3 and delivering them to the CPU 1 and LEDs for indicating the respective signal states. . The slots (S, S) according to claim 1, wherein the slots (S, S ') are formed at the circumference of the wing of the CARR (2) and the optical interrupters (S1-S3) constituting the sensor unit (3). A compact disc position access device for detecting the position of the designated disc 12 by detecting ') and using a combination of the signals SO1-SO4. 2. Access device according to claim 1, in which a slot (S) is formed at a particular location on the top of the CARR (2) to index each disk (12). 2. A multiple compact disc position access device according to claim 1, wherein the CPU (1) controls the rotational speed of the CARR (2). The apparatus of claim 1, wherein a surface reflection type optical interrupter (S4) is installed on one side of the CARR (2) to detect the presence or absence of the disk (12) in the slot (S '). 3. A multiple compact disc position access device according to claim 2, which uses something like a reflective tape in addition to the slot (S, S ') shape.

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