KR19980022943A - Optical pickup transfer control device of optical disc player - Google Patents

Abstract

The present invention relates to an optical pickup transfer control device, comprising: an optical pickup transfer unit including a gear unit for linearly reciprocating an optical pickup and a motor for providing power to the singer gear unit; A motor controller which controls driving of the motor; A central processing unit for applying a control signal for driving control of the motor to the motor control unit; And an optical pickup incidence detection means for outputting an incidence signal to the central processing unit, indicating that the optical pickup has reached a position where it can no longer be advanced when an overcurrent exceeding a set current value is detected while detecting a driving current supplied to the motor. It is composed. Determining and controlling whether the optical pickup has been transferred to the initial position on the main body circuit board makes it easy to design and assemble the system by eliminating electrical wiring.

Description

Optical pickup transfer control device of optical disc player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup transfer control apparatus for an optical disc player, and more particularly, to an optical pickup transfer control apparatus for an optical disc drive, wherein the control for transferring the optical pickup to a predetermined initial position is performed by an external signal system.

In general, an optical disc player is configured to irradiate light to a predetermined position of an optical recording medium in order to record information on the optical recording medium and to read recorded information, to pick up the reflected light, and to read-out the picked up signal.

The optical pickup used in such an optical disk drive is a component for scanning an optical beam onto an optical recording medium and detecting an optical signal reflected from the optical recording medium. The optical signal detected by the optical pickup is converted into an electrical signal and then transmitted to a signal processing system that generates and processes an error signal and a reproduction signal.

As a method for reading and processing an optical recording medium in which information is recorded at a high density, the optical disc player is configured to follow a track, which is a data recording surface of a disk, on which an optical pickup rotates, while rotating a disk, which is an optical recording medium on which information is recorded, at high speed.

The optical pickup transfer control apparatus is a device that controls the transfer of the optical pickup so that the optical pickup follows the track of the disc.

FIG. 1 is a schematic plan view of a general optical disc player, and FIG. 2 is a partial rear view of FIG.

Referring to this, a turntable 3 in which a disc is seated on a deck frame 2 coupled and supported by a deck frame 1 rotatably installed on a main body (not shown) and a buffer member 6 having an elastic force, A spindle motor 5 for rotating the seated disk, a limit switch 13 for initial position determination of the optical pickup 4, and an optical pickup transfer unit are provided.

Components of the conventional optical pickup transfer control device is an optical pickup transfer unit consisting of a motor 10, a gear unit 8, a guide rail 7, a rack 11, a sliding unit 12, a main body installed on a deck plate, The motor controller may be provided on a separate circuit board, and may be roughly divided into a central controller configured to control the driving of the motor 10 and a central processor configured to apply a control signal to the motor controller.

The rotary shaft 10a, the first gear 8a, the second gear 8b, the third gear 8c and the fourth gear 8d of the motor 10 are engaged with each other, and the optical pickup 4 has a deck. It is coupled to the sliding part 12 that slides along the guide rail 7 mounted on the plate 2, the sliding part 12 is a gear that serves to convert the rotational motion into linear motion at its side It is coupled with the leg 11.

With this configuration, the rotational motion transmitted by the motor 10 is converted into linear motion by the rack 11, and as a result, the optical pickup 4 fixed with the rack 11 is guided by the guide rail 7. Will be transported accordingly. Therefore, the optical pickup can linearly reciprocate within a certain range of distance along the guide rail.

As a preparatory step for reading a disc, a signal for inputting a tray into and out of the main body to be taken out of the main body for accommodating the disc is input to the central processing unit, or a disc read command with the disc already aligned to the turntable 3 If this is input to the central processing unit, the optical pickup 4 should be positioned at the position of the innermost peripheral surface of the disk, i.e., the initial position adjacent to the turntable 3, before the disk reading is performed.

As a means for determining that the optical pickup 4 has reached the initial position, a limit switch 13 is conventionally provided at a position on the deck plate 2 corresponding to the initial position. When the optical pickup 4 transported along the guide rail 7 turns on the limit switch 13 by contact, the on signal is transmitted to the motor control unit, and then the driving of the motor 10 is stopped. However, since the limit switch 13 installed on the deck plate 2 should be wired with a circuit board separately provided in the main body, assembly and manufacturing are difficult.

On the other hand, it is also possible to use a Hall sensor that monitors the rotation of the motor 10 and outputs a pulse proportional to the rotation, but it is also difficult to fabricate and assemble because it must be installed on the deck plate 2, and the Hall sensor is expensive. It has the disadvantage of causing the price increase of the product.

The present invention was devised to improve the above problems, and an optical pickup transport control apparatus is constructed so that the means for determining that the optical pickup is at a predetermined initial position is provided on the circuit board of the main body. The purpose is to provide.

1 is a plan view showing the configuration of a conventional optical pickup transfer control device,

Figure 2 is a partial excerpt rear view of Figure 1,

3 is a plan view illustrating an optical pickup transfer unit of the optical pickup transfer control apparatus according to the present invention;

4 is a schematic block diagram of elements provided in the main body of the optical disc drive to constitute the optical pickup transfer control device.

Explanation of symbols for main parts of the drawings

1: deck frame 2, 22: deck plate

3, 23: turntable 4, 24: optical pickup

5, 25: spindle motor 7, 27: guide rail

8, 28: gear portions 10, 30; motor

11, 31: rack 12, 32: sliding part

13: limit switch 40: motor control unit

41: central processing unit 42: optical pickup result detection means

43: resistor 44, 45: transistor

46: servo signal processor

In order to achieve the above object, an optical pickup transport control apparatus according to the present invention includes an optical pickup transfer unit including a gear unit for linearly reciprocating the optical pickup and a motor for providing power to the singer gear unit; A motor controller which controls driving of the motor; A central processing unit for applying a control signal for driving control of the motor to the motor control unit; Optical pickup incidence detection means for outputting an incidence signal to the central processing unit indicating that the optical pickup has reached a position where the optical pickup can no longer be advanced when an overcurrent exceeding a set current value is detected while detecting the driving current supplied to the motor; It is characterized by that.

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

3 is a plan view of an optical pickup transfer unit according to an exemplary embodiment of the present invention, and FIG. 4 is a schematic block diagram of elements included in a main body of an optical disc drive to form an optical pickup transfer control device.

Referring to this, the optical pickup transfer control device is provided with an optical pickup transfer unit provided with a gear structure for transmitting the motor 30 and the rotational movement of the motor 30 to the optical pickup 24, the circuit board of the main body is provided with the motor ( 30 the motor controller 40 for controlling the control unit, the central processing unit 41 for applying the control signal to the motor control unit 40, the optical pickup 24 detects that the predetermined initial position has been reached, and centers a signal corresponding thereto. And an optical pickup incidence detection unit 42 output to the processing unit.

The optical pickup transfer unit is roughly divided into a motor 30, a gear unit 28, a guide rail 27, a rack 31 and a sliding unit 32, which are driving means on the deck plate 22. Here, the deck plate 22 is supported by being coupled to the deck frame rotatably mounted on the main body (not shown) and the buffer member having an elastic force, the turntable 23 on which the disc is seated on the deck plate 22 The spindle motor 25 is installed to rotate the seated disk. In the optical pickup transfer unit, the rotary shaft 30a, the first gear 28a, the second gear 28b, the third gear 28c, and the fourth gear 28d of the motor 30 are sequentially engaged with each other. The optical pickup 24 is coupled with a sliding portion 32 that slides along the guide rails 27 mounted on the deck plate 22, which sliding portion 32 converts rotational movement into linear movement on its side. It is coupled with the rake 31 which is a gear to play a role.

By such a configuration, the rotational motion transmitted by the motor 30 is converted into linear motion by the leg 31, and as a result, the optical pickup 24 connected with the leg 31 is along the guide rail 27. Transferred. Therefore, the optical pickup 24 is movable along a guide rail 27 within a predetermined range.

When the disk (not shown) rotates on the turntable 23, the optical pickup 24 is transported along this guide rail 27 to follow the track which is the recording area of the disk.

The optical pickup incidence detecting means 42 is provided on the power supply line from the power supply to the motor 30 to determine the completion of the transfer of the optical pickup 24 while monitoring the driving current supplied to the motor 30. In the illustrated method, the resistance element 43 is connected on the line from the power supply to the motor 30, and when the voltage variation across the resistance element 43 is higher than or equal to the set level, the central processing unit 41 outputs a high level signal. Two transistors 44 and 45 are gradually accelerated to output to the.

The resistance value of the resistor element 43 is the transistor 44 is turned on in the current level range supplied to the motor 30 while the optical pickup 24 follows the track of the disk or accesses to a predetermined position of the disk. It is determined not to turn on, but to turn on the transistor 44 in the overcurrent state in which the advance of the optical pickup 24 is cut off and flows.

The optical pickup incident detection means 42 may be provided on the power supply connection line between the motor control unit 40 and the motor 30.

The central processing unit 41 processes the signals inputted from an input device connected to or provided with the optical disc player, and in particular, when the signal input from the outside is a signal related to reading the optical disc, the optical pickup is carried out to the motor control unit 40 for read preparation. (24) sends a control signal corresponding to the setting signal to wait to the initial position.

The motor controller 42 controls the rotation speed, the rotation direction, and the driving of the stop lamp motor 30 of the motor 30 according to the input signal.

The optical pickup feed control device configured as described above operates as follows.

First, a disk read command is inputted to the central processing unit 41 to take out a tray input and output from the outside to the outside of the main body for accommodating the disc, or with the disc already aligned with the read position on the turntable 23. When the central processing unit 41 is input to the central processing unit 41, the central processing unit 41 applies a control signal corresponding to a command to wait for the optical pickup 24 to be in an initial position state to the motor control unit 40. The motor controller 40 determines the rotation direction of the motor 30 so that the optical pickup 24 moves forward in the direction in which the turntable 23 is located according to the applied control signal, and supplies power to the motor 30. Since the optical pickup 24 is advanced toward the spindle motor 25 along the guide rail 27 by the rotation of the motor 30 to reach the end of the spindle motor 25 or the guide rail 27, the advance Is blocked. At this time, the instantaneous overcurrent flows through the motor 30 via the resistance element 43, and the two transistors 44 and 45 are turned on and a high level output signal is input to the central processing unit 41. Thereafter, the central processing unit 41 applies a control signal to the motor controller 40 indicating that the optical pickup 24 has reached the initial position, and accordingly, driving of the motor 30 is stopped by braking of the motor controller 40. Is stopped.

The motor controller 40 then reads the optical signal picked up from the optical pickup 24 to the control signal of the servo signal processor 46 provided to control the transfer of the optical pickup 24 to accurately follow the track of the disc. Accordingly, the driving of the motor 30 is adjusted.

In this way, the optical pickup incidence detecting means 42 that monitors the current supplied to the motor 30 driving the optical pickup 24 and determines that the optical pickup 24 reaches the set initial position is formed on the circuit board of the main body. Because it is provided in the production is easy.

As described above, by providing the optical pickup transfer control apparatus according to the present invention, it is possible to determine whether the optical pickup is transferred to the initial position on the main body circuit board, and to easily design and assemble the system according to the omission of electrical wiring. Do.

Claims (1)

An optical pickup transfer unit including a gear unit for linearly reciprocating the optical pickup and a motor providing power to the singer gear unit; A motor controller which controls driving of the motor; A central processing unit for applying a control signal for driving control of the motor to the motor control unit; Optical pickup incidence detection means for outputting an incidence signal to the central processing unit indicating that the optical pickup has reached a position where the optical pickup can no longer be advanced when an overcurrent exceeding a set current value is detected while detecting the driving current supplied to the motor; Optical pickup transfer control device, characterized in that.