KR0135925Y1 - Circuit for generating control signal of sled motor for optical disk player - Google Patents

Abstract

The present invention relates to a circuit for generating a sled motor control signal of a magneto-optical disk player, and more particularly to a circuit for generating an n-fold FG (Frequency Generator) signal for controlling a sled motor of a magneto-optical disk at high speed. The circuit may include a Hall sensor for generating first, second, third and fourth phase difference signals 0 °, 90 °, 180 °, and 270 ° different in phase from each other in response to a rotational speed of the sled motor; A first multiplication signal generation circuit for generating a doubled FG signal by performing an exclusive logical sum of a phase comparison signal between a first phase difference signal and a third phase difference signal and a phase comparison signal between the second phase difference signal and the fourth phase difference signal; A second doubling signal generating circuit for generating another doubling FG signal having a phase difference of π / 4 and a doubled FG signal output from the one doubling signal generating circuit, and the first and second doubling signal generating circuits And detecting a phase difference between the two-folded FG signals outputted from each other to generate four-folded FG signals.

Description

Sled motor control signal generation circuit of magneto-optical disc player

1 is a diagram showing a sled motor control signal generation circuit of a conventional magneto-optical disc player.

2 is an operation timing diagram for explaining the operation of the circuit shown in FIG.

3 is a view showing a sled motor control signal generation circuit of a magneto-optical disk player according to the present invention.

4 is an operation timing diagram for explaining the operation of the circuit shown in FIG.

The present invention relates to a sled motor control signal generating circuit of a magneto-optical disk player, and more particularly, to a circuit for generating an n-fold FG (Frequency Generator) signal for controlling the sled motor of a magneto-optical disk at high speed. It is about.

In order to read the information recorded on the magneto-optical disk quickly, the sled motor for transporting the optical pickup unit must be accurately and quickly controlled. That is, the driver driving the sled motor must be controlled quickly and accurately. Recently, due to the rapid development of the magneto-optical disc player, devices of 4x and 8x speeds have been released, and it is required to control the sled motor at high speed in response to their access speed.

As described above, in order to control the sled motor at a high speed, the sled motor driver must be controlled at an accurate and high speed. In order to quickly and accurately control the sled motor drawer as described above, the FG signal should be generated by using a phase difference signal output from a Hall sensor for detecting rotation of the sled motor. The FG signal is used as an index for knowing how much track the pickup unit has moved per one FG signal (per pulse). Therefore, in order to increase the search speed and resolution of the track movement, the FG signal is essentially required. That is, in order to search the recording information at high speed by using the FG signal generated in response to the phase difference signal output from the hall sensor, the sled motor driver must be controlled at high speed by taking out the FG signal.

1 is a diagram showing a sled motor control signal generation circuit of a conventional magneto-optical disc player. The configuration includes a Hall sensor 12 that detects rotation of a sled motor (not shown) and generates first, second, third, and fourth phase difference signals corresponding thereto, and a first output from the Hall sensor 12. And comparing the phase difference between the third phase difference signal and outputting a first comparative signal in the form of a pulse, and comparing the phase difference between the second and fourth phase difference signals output from the hall sensor 12, and comparing the phase difference between the third phase difference signal and the second phase in the form of a pulse. A first exclusive logical sum gate for generating a doubled FG signal by exclusively ORing the second comparator 16 outputting the comparison signal and the first and second comparison signals output from the first and second comparators 14 and 16, respectively. (Hereinafter referred to as XOR1) 18, a delay circuit 20 for delaying and outputting the doubled FG signal outputted from the XOR 18 and the output of the XOR 18 and the delayed signal are exclusively ORed to generate a quadrupled FG signal. Second exclusive OR Bit (hereinafter referred to Abraham XOR2) is composed of 22. The first phase difference signal is a signal having a phase of 0 °, the second phase difference signal is a signal having a phase of 90 °, and the third phase difference signal is a signal having a phase of 180 °. The fourth phase difference signal is a signal having a phase of 270 degrees.

FIG. 2 is an operation timing diagram for explaining the operation of the circuit shown in FIG.

Referring to the operation timing diagram shown in FIG. 2, the sampling operation of the FG signal according to the configuration of FIG.

The first, second, third, and fourth phase difference signals 0 °, 90 °, and 180 ° as shown in FIGS. 2, a, b, c, and d from the Hall sensor 12 due to the rotation of the solar motor (not shown). , 270 ° are output respectively. At this time, the first phase difference signal 0 and the third phase difference signal 180 ° are supplied to the input terminals of the first comparator 14, and the second phase difference signal 90 ° and the fourth phase difference signal 270 ° are the input terminals of the second comparator 16. Supplied.

The first comparator 14 compares the level of the first phase difference signal 0 ° and the third phase difference signal 180 ° to generate a first comparison signal as shown in FIG. In addition, the second comparator 16 compares the level of the second phase difference signal 90 ° and the fourth phase difference signal 270 ° to generate a second comparison signal as shown in FIG. In this case, each of the first comparison signal and the second comparison signal is input to two input terminals of XOR1 and is exclusively negatively logic and output as a doubled FG signal as shown in FIG.

The doubled FG signal as described above is supplied to a delay circuit 20 composed of a resistor and a capacitor and simultaneously supplied to one input terminal of the XOR2 22. The delay circuit 20 supplies a double FG signal as shown in FIG. 2G to another input terminal of XOR2 22 with a predetermined delay as shown in FIG. Accordingly, XOR2 22 detects the phase difference between the doubled FG signal as shown in FIG. 2 g and the delayed double FG signal as shown in FIG. 2 h by an exclusive OR, and when the levels of the two signals are mutually exclusive, It generates 4 times FG signal.

The quadruple FG signal generated as shown in FIG. 2 is provided to a microcomputer or microprocessor (not shown) that controls the operation of the magneto-optical disc player and used as a signal for controlling the transport of the track.

However, the conventional FG signal shunt circuit as shown in FIG. 1 generates a doubled FG signal by two comparators and one exclusive OR gate, and the output width of the delay unit composed of elements such as resistors and capacitors. The following problems occurred by detecting the phase difference between the FG signals and generating the quadrupled signals. Firstly, if the magneto-optical disc player does not have a microprocessor that detects edges by detecting only the edge portion of the doubled FG signal and generates the four doubled FG signal, a separate interface is required. There was a problem. Secondly, there is a very high probability that an error of the FG signal occurs depending on the number of revolutions of the sled motor by using a delay circuit by a resistor and a capacitor. For example, if the rotation speed of the threaded motor is severely changed while the RC time constant in the delay circuit is fixed, waveform distortion of the phase difference signal output from the hall sensor occurs at that frequency, causing an error in the FG signal. In addition, there is a problem in that it is not easy to integrate a delay circuit including a resistor, a capacitor, and the like.

Accordingly, an object of the present invention is to provide a sled motor control signal generation circuit of a magneto-optical disk player that stably generates n-folded FG signals using phase difference signals from a Hall sensor for detecting the rotational speed of the sled motor. have.

Another object of the present invention is to generate a sled motor control signal for generating an n-fold FG signal having a 50:50 duty by using phase difference signals from a Hall sensor for detecting a rotational speed of a slad motor.

The present invention for achieving the above objects generates the first, second, third and fourth phase difference signals 0 °, 90 °, 150 °, 270 ° and the like which are different in phase from the rotational speed of the sled motor. A sled motor control signal generation circuit of a magneto-optical disc player having a Hall sensor, the phase comparison signal between the first phase difference signal and the third phase difference signal and the phase comparison signal between the second phase difference signal and the fourth phase difference signal. A first multiplication signal generating circuit for generating a double multiplied FG signal by an exclusive logical sum, and another double multiplication FG signal having a phase difference of π / 4 with a double multiplied FG signal output from the first multiplication signal generating circuit. And a circuit for generating a quadruple FG signal by detecting a phase difference between the second quadrature signal generating circuit and a second quadrature FG signal output from the first and second multiplication signal generating circuits, respectively. do .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings of the embodiments of the present invention, those having substantially the same configuration and function as those of the above-described components will use the same reference numerals.

3 is a diagram illustrating a sled motor control signal generation circuit of the magneto-optical disk player according to the present invention. Its configuration includes a third comparator 24 which compares the first, second and phase difference signals 0 ° and 90 ° output from the hall sensor and outputs a third comparison signal, and the first, fourth and phase difference signals 0 ° and 270. A second comparator signal generation circuit comprising a fourth comparator 28 for comparing the degrees and outputting a fourth comparator signal and XOR 3 for detecting a phase difference between the third and fourth comparator signals to generate a second doubled FG signal; Is further added between the output node of XOR1 18 in FIG. 1 and another input terminal of XOR2. At this time, one input terminal of the XOR2 is connected to the output terminal of the XOR1 18, another input terminal is connected to the output terminal of the XOR3.

The configuration of the circuit configured as shown in FIG. 2 shows a relationship for facilitating explanation and generating a low four-fold FG signal.

4 is an operation timing diagram for explaining the operation of the circuit shown in FIG. In the figure of FIG. 4, waveforms denoted by 0 °, 180 °, 90 °, and 270 ° are phase difference signals output from the Hall sensor 12 described in FIG. 1, and timings indicated by A to G are operations of the respective parts of FIG. Waveform diagrams.

Hereinafter, the operation of the embodiment configured as shown in FIG. 3 according to the present invention will be described in detail.

Now, when the sled motor (not shown) is rotated to generate the first, second, third and fourth phase difference signals 0 °, 90 °, 180 °, and 270 ° shown in FIG. 4 from the Hall sensor. , The first and second comparators 14, 16, and XOR1 18 generate a doubled FG signal as shown in FIG. The 2-fold FG signal E generated by this operation is supplied to one input terminal of XOR2.

On the other hand, the second multiplex signal generation circuit composed of the third and fourth comparators 24, 26 and XOR3 28 generates another two-fold FG signal having a π / 4 phase difference in the period of the two-fold FG signal as shown in FIG. And supply it to another input terminal of XOR2 22. The operation of the second cultivation signal generating circuit operated as described above is as follows.

When the first phase difference signal 0 ° and the second phase difference signal 90 ° are input to the third comparator 24 among the phase difference signals as shown in FIG. 4, the third comparator 24 compares the phases of the two phase difference signals, and FIG. A third comparison signal such as In addition, the fourth comparator 26 compares the first phase difference signal 0 ° with the second phase difference signal 270 ° to generate a fourth comparison signal as shown in FIG. 4D. At this time, the third and fourth comparison signals such as the fourth and fourth comparison signals C and D are input to the two input terminals of XOR3 28 and compared with each other.

Accordingly, the XOR3 28 generates the second doubled FG signal by the phase difference between the two signals by the exclusive OR of the third and fourth comparison signals as shown in FIG. At this time, the second two-fold FG signal generated from the XOR3 28 has a phase difference of about π / 4 than the phase of the first two-fold FG signal.

XOR2 inputting the first two-fold FG signal outputted from XOR1 18 as shown in FIG. 4E and the two-fold FG signal outputted from XOR3 28 with two input terminals is an exclusive OR of the two signals. Detects the phase difference between them. The output of XOR2 22 detected as described above is a 4-fold FG signal, and the duty ratio has 50:50. The four-fold FG signal generated as described above is provided to a microprocessor that controls the rotation speed of the sled motor. At this time, since the duty ratio of the 4-fold FG signal is 50:50, it can be shared by the microprocessor for edge or level detection.

In the embodiment of the present invention, for the sake of simplicity, the generation relationship of the four-folded FG signal has been described. However, when n (where n is an integer greater than 2) is generated, the multiplexed FG signals are output from the hall sensor. Note that the phase signal can be generated by combining appropriately.

As described above, the present invention can be used for 4x and 8x disk players by generating n times the signal according to the phase difference signal of N phase from the Hall sensor for controlling the sled motor in the magneto-optical disk player. When a circuit or the like is connected to the final output terminal, an eight-fold FG signal can be easily generated.

Claims (4)

Slave of a magneto-optical disc player having a Hall sensor which generates first, second, third and fourth phase difference signals 0 °, 90 °, 180 ° and 270 ° that are different in phase from the rotational speed of the sled motor. In the red motor control signal generation circuit, an exclusive logical sum of a phase comparison signal between the first phase difference signal and a third phase difference signal and a phase comparison signal between the second phase difference signal and the fourth phase difference signal generates a doubled FG signal. A first fold signal generation circuit and a second fold signal generation circuit for generating another doubling FG signal having a phase difference of π / 4 with a doubled FG signal output from the first fold signal generation circuit; A sled motor of a magneto-optical disc player, characterized in that it comprises means for detecting the phase difference between the two-folded FG signals output from the first and second-draining signal generating circuits, respectively, and generating a four-folded FG signal. Control signal generation circuit. The first comparator signal generating circuit of claim 1, wherein the first gradation signal generating circuit compares a first phase difference signal 0 ° and a third phase difference signal 180 ° output from the hall sensor to generate a first comparison signal, and the hole Comparing the second phase difference signal 90 ° output from the sensor to the fourth phase difference signal 270 °, the second comparator generating the second comparison signal and the first and second comparison signals output from the first and second comparators are exclusive. A sled motor control signal generation circuit of a magneto-optical disc player, characterized in that it comprises a first exclusive logical sum gate for generating a double-multiplied FG signal. 3. The second and fourth phase difference signal generators of claim 1, wherein the second cultivation signal generating circuit commonly inputs the first phase difference signal 0 ° output from the hall sensor and is output from the hall sensor. , The third and fourth comparators outputting the second and fourth comparators by comparing 270 ° with each other input terminal and the third and fourth comparators outputted from the third and fourth comparators, respectively. And a third exclusive OR gate for generating a doubled FG signal by exclusively ORing the signals. 4. The second exclusive logical sum of claim 3, wherein the means generates a quadruple FG signal by exclusively summing the doubled FG signals output from the first multiplier signal generation circuit and the second multiplier signal generation circuit, respectively. A sled motor control signal generation circuit of a magneto-optical disc player, characterized by comprising a gate.