JP2005039953A - Optical disk motor driver and integrated circuit, and method for inputting signal into this optical disk motor driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease the number of terminals without need for providing a gain adjusting signal input terminal for a speed control amplifier. <P>SOLUTION: This optical disk motor driver includes at least the following: a function selection signal input terminal for inputting a signal for selectively operating either of a spindle function or a loading function; a loading input terminal for inputting a loading control signal; and a spindle motor speed control amplifier for generating a driving signal determining the rotational speed of a spindle motor. When the spindle function is selected in response to a signal into the function selection signal input terminal, a gain adjusting signal of the spindle motor speed control amplifier is inputted into the loading input terminal to be inputted into a gain adjusting portion of the amplifier. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disk motor driver, an integrated circuit, and a signal input method to an optical disk motor driver.

  In an optical disc apparatus equipped with an optical disc motor driver (hereinafter referred to as a motor driver), a spindle system that rotates the optical disc at a desired speed, an optical pickup system that detects an optical disc signal, an optical disc insertion / There are at least three driven systems in which the motor driver performs drive control, such as a loading system for discharging.

There are several types of optical discs such as CD media and DVD media, and it is necessary to control the speed of the spindle motor for rotating the optical disc in order to cope with the speed suitable for the specifications of each media. is there. The conventional motor driver is provided with a dedicated terminal to which a gain adjustment signal for controlling the speed of the spindle motor is input. The conventional motor driver controls the spindle motor speed by adjusting the gain of the spindle motor speed control amplifier based on the gain adjustment signal input via the dedicated terminal (for example, patent) Reference 1).
Japanese Patent Laid-Open No. 11-86433

  By the way, when the motor driver for performing drive control for each driven system such as the loading system, the spindle system, and the optical pickup system described above is made into one chip, it is necessary to provide terminals necessary for each driven system in one chip. is there. For this reason, the number of terminals provided in the motor driver made into one chip increases, and there has been a problem that it cannot be miniaturized.

  An object of the present invention is to provide an optical disk motor driver, an integrated circuit, and a signal input method to the optical disk motor driver.

In the main invention according to the present invention, a function selection signal input terminal to which a signal for selectively operating either the spindle function or the loading function is input, a loading input terminal to which a loading control signal is input, a spindle In an optical disk motor driver comprising at least a spindle motor speed control amplifier for generating a drive signal for determining a rotation speed of the motor,
The loading input terminal is connected to a gain adjustment unit of the spindle motor speed control amplifier, and when the spindle function is selected by the signal to the function selection signal input terminal, the gain adjustment of the spindle motor speed control amplifier is performed. A signal is input to the loading input terminal so as to be input to the gain adjustment unit of the amplifier.

  Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  The gain adjustment signal of the spindle motor speed control amplifier is input to the loading input terminal so as to be input to the gain adjustment unit of the amplifier. That is, the loading input terminal also serves as an input terminal for a gain adjustment signal of the spindle motor speed control amplifier. Therefore, the optical disk motor driver does not need to provide a dedicated terminal for inputting the gain adjustment signal of the spindle motor speed control amplifier, and the number of terminals as a whole can be reduced.

<System configuration>
FIG. 1 shows a configuration of a control system including a motor driver 200 according to an embodiment of the present invention. As shown in the figure, the control system includes a system controller 100, a motor driver 200, and driven parts (spindle motor part 300, optical pickup part 400, loading motor part 500).

  The system controller 100 can employ a microcomputer, a DSP (Digital Signal Processor), or the like, and controls the motor driver 200.

  The motor driver 200 controls the spindle motor unit 300, the optical pickup unit 400, and the loading motor unit 500 based on various control commands from the system controller 100. It should be noted that circuits that control spindle, optical pickup, and loading operations in the motor driver 200 are referred to as a spindle circuit system, an optical pickup circuit system, and a loading circuit system, respectively. The drive signals output from each circuit system to the driven parts (spindle motor part 300, optical pickup part 400, loading motor part 500) are referred to as spindle drive signals, optical pickup drive signals, and loading drive signals, respectively.

  The spindle motor unit 300 drives the optical disk to rotate at a desired speed based on the spindle drive signal input from the motor driver 200.

  The optical pickup unit 400 detects an optical disc signal based on the optical pickup drive signal input from the motor driver 200. The optical pickup unit 400 includes an actuator such as a focus for displacing the optical pickup in a direction perpendicular to the surface of the optical disk, tracking for displacing the optical pickup in a direction parallel to the surface of the optical disk, and a sled that moves to the outer periphery of the disk. Has been.

  The loading motor unit 500 inserts / discharges the optical disc based on the loading drive signal input from the motor driver 200.

<Configuration of motor driver>
Based on the block diagram of FIG. 2, the configuration of the motor driver 200 according to the embodiment of the present invention will be described.

  The motor driver 200 is composed of a one-chip IC, and a mute terminal (T1) to which a signal for selectively operating either the spindle function or the loading function is input from the system controller 100, and the loading control signal is It has a loading input terminal (T2) to be inputted and a spindle speed control input terminal (T3) to which a spindle speed control signal is inputted.

  The motor driver 200 includes a loading control amplifier (AMP1) for generating a loading drive signal, a spindle motor speed control amplifier (AMP2) for generating a spindle drive signal for determining the rotation speed of the spindle motor, and a spindle motor. A gain adjustment comparator (COM) capable of adjusting the gain of the speed control amplifier (AMP2) is provided.

  The loading control amplifier (AMP1) can operate when a loading Vref 220 (amplifier operation signal) is applied. The loading Vref 220 is a power supply voltage applied to the loading control amplifier (AMP1) when driving of the loading circuit system is selected.

 The gain adjustment comparator (COM) can be operated by applying the spindle Vref 210 (comparator operation signal). The spindle Vref 210 is a power supply voltage applied to the gain adjustment comparator (COM) when driving of the spindle circuit system is selected. A reference voltage Vref1 is applied to one input terminal of the gain adjustment comparator (COM). A gain switching signal is input to the other input terminal of the gain adjustment comparator (COM). Based on the comparison result between the reference voltage Vref1 and the gain switching signal, the gain adjustment comparator (COM) sets one logical value indicating a large gain, for example, “H” or the other logical value indicating a small gain, for example, “L”. Output. As a result, the motor driver 200 can select two types of gains when selecting driving of the spindle circuit system.

  The spindle motor speed control amplifier (AMP2) operates only when the spindle Vref 210 is selected. The reference voltage Vref2 is applied to one input terminal of the spindle motor speed control amplifier (AMP2), and the spindle speed control signal is input to the other input terminal via the resistor R1. Further, the value of the feedback resistor R2 (“gain adjustment unit”) connected to the spindle motor speed control amplifier (AMP2) is adjusted by the output from the gain adjustment comparator (COM).

  The spindle and loading operations are selectively switched by inputting a function selection signal from the system controller 100 to the mute terminal (T1). In other words, the loading circuit system does not operate during the operation of the spindle circuit system, and the spindle circuit system does not operate during the operation of the loading circuit system. For this reason, in the prior art, during the operation of the spindle circuit system, the input terminal of the loading circuit system is not used.

  In view of the above, in the present invention, the loading input terminal (T2) is also used as the gain adjustment input terminal of the spindle motor speed control amplifier.

  In the above-described embodiment, the gain switching signal input via the loading input terminal (T2) is connected to the spindle motor speed control amplifier (AMP2) without passing through the gain adjustment comparator (COM). The gain of the spindle motor speed control amplifier (AMP2) may be switched by inputting the feedback resistance R2. In the embodiment described above, the gain adjustment comparator (COM) adjusts the value of the resistor R1 connected to the spindle motor speed control amplifier (AMP2), so that the spindle motor speed control amplifier (AMP2) You may make it perform gain switching.

<Operation of motor driver>
Based on the block diagram of FIG. 2, the operation of the motor driver when a function selection signal is input from the system controller 100 to the mute terminal will be described.

  First, when a function selection signal for selecting driving of the loading circuit system is input to the mute terminal (T1), the motor driver 200 switches and selects the loading Vref 220 and applies it to the loading control amplifier (AMP1). . Further, a Sin wave loading control signal, which is an input signal for rotating the motor, is input to the loading control amplifier (AMP1) via the loading input terminal (T2). As a result, the loading control signal is amplified at a predetermined amplification factor based on the loading Vref 220.

  Based on the output amplified by the loading control amplifier (AMP1), the motor driver 200 passes through an H bridge circuit (not shown) in the motor driver 200 to load the loading motor (for example, a brushed DC motor) of the loading motor unit 500. ) Is rotated forward or backward, and the tray is inserted / discharged. In this case, since the spindle Vref 210 is not applied to the gain adjustment comparator (COM) as a comparator operation signal, the spindle circuit system does not operate as a result.

  On the other hand, when a function selection signal for selecting driving of the spindle circuit system is input to the mute terminal (T1), the motor driver 200 switches and selects the spindle Vref 210 and applies it to the gain adjustment comparator (COM). To do. Note that a DC wave gain switching signal is input to the loading input terminal (T2) instead of the loading control signal. As a result, the gain adjustment comparator (COM) selects two types of gains in the spindle motor speed control amplifier (AMP2) according to the gain switching signal, the reference voltage Vref1, and the comparison result.

  For example, when the gain switching signal input via the loading input terminal (T2) is less than the reference Vref1, the gain adjustment comparator (COM) switches to the small gain setting side by, for example, a low level output. When the gain switching signal exceeds Vref1, the comparator (COM) is switched to the large gain setting side by, for example, a high level output.

  A spindle speed control signal is input to the spindle motor speed control amplifier (AMP2) via a spindle speed control input terminal (T3). As described above, the amplification factor in the spindle motor speed control amplifier (AMP2) is adjusted based on the output of the gain adjustment comparator (COM). Accordingly, the speed of the spindle motor can be controlled based on the spindle speed control signal amplified according to the adjusted amplification factor.

  As mentioned above, although embodiment of this invention was described concretely based on the embodiment, it is not limited to this, It can change variously in the range which does not deviate from the summary.

1 is a system configuration diagram including a motor driver according to an embodiment of the present invention. 1 is a block diagram of a motor driver according to an embodiment of the present invention.

Explanation of symbols

100 System controller 200 Motor driver 210 Spindle Vref
220 Vref for loading
300 Spindle motor section 400 Optical pickup section 500 Loading motor section

Claims (5)

A function selection signal input terminal to which a signal for selectively operating either the spindle function or the loading function is input;
A loading input terminal to which a loading control signal is input;
A spindle motor speed control amplifier for generating a drive signal for determining the rotation speed of the spindle motor;
In an optical disk motor driver having at least
When the spindle function is selected by the signal to the function selection signal input terminal, a gain adjustment signal of the spindle motor speed control amplifier is input to the gain adjustment unit of the amplifier so as to be input to the loading input terminal. A motor driver for an optical disc, wherein   2. The optical disk motor driver according to claim 1, wherein the gain adjusting unit is a feedback resistor of the spindle motor speed control amplifier. Between the loading input terminal and the gain adjustment unit, a reference signal is input to one input terminal, and a comparator to which the gain adjustment signal is input via the loading input terminal is input to the other input terminal. ,
The comparator is
3. The optical disk motor driver according to claim 1, wherein a comparison result between the reference signal and the gain adjustment signal is output to the gain adjustment unit.   4. An integrated circuit comprising a drive circuit for controlling the supply of current to a drive coil of a motor, wherein the optical disk motor driver according to claim 1 is integrated. A function selection signal input terminal to which a signal for selectively operating either the spindle function or the loading function is input;
A loading input terminal to which a loading control signal is input;
A spindle motor speed control amplifier for generating a drive signal for determining the rotation speed of the spindle motor;
A signal input method to an optical disk motor driver having at least
The spindle function is selected by the signal to the function selection signal input terminal;
A gain adjustment signal of the spindle motor speed control amplifier is input to the loading input terminal so as to be input to the gain adjustment unit of the amplifier;
A signal input method to an optical disk motor driver characterized by comprising:

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