KR100188967B1 - Apparatus for transfer controlling of optical pickup - Google Patents

Abstract

The present invention relates to an optical pickup transfer control device, and more particularly, to an optical pickup transfer control device that includes an optical pickup transferring unit having a gear portion for linearly reciprocating the optical pickup and a motor for supplying power to the sifting gear portion. A motor control unit for controlling driving of the motor; A central processing unit for applying a control signal for controlling the driving of the motor to the motor control unit; And an optical pickup incident detection means for detecting a drive current supplied to the motor and outputting an incident signal indicating that the optical pickup has reached a position where it can not be further advanced to an overcurrent exceeding a preset current value to the central processing unit . It is possible to judge whether or not the optical pickup is completed to the initial position on the main circuit board, and it is easy to design and assemble the system according to the omission of the electric wiring.

Description

An optical pickup transfer control device of an optical disc player

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 configured such that control for transferring an optical pickup to a set initial position is performed by an external signal system.

Generally, an optical disc player irradiates light to a predetermined position of an optical recording medium to record information on the optical recording medium and read the recorded information, pick up the reflected light, and read out the picked-up signal.

An optical pickup used in such an optical disc drive is a component that scans a light beam onto an optical recording medium and detects 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 for generating and processing an error signal and a reproduction signal.

As a method for reading out and processing an optical recording medium on 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 disc on which the optical pickup rotates, while rotating the disc as an optical recording medium on which information is recorded at high speed.

The optical pickup transfer control device is a device for controlling the transfer of the optical pickup so that the optical pickup follows the track of the disk.

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

A turn table 3 on which a disc is seated is mounted on a deck plate 2 rotatably mounted on a main body (not shown) and supported by a cushioning member 6 having elastic force, A limit switch 13 for determining an initial position of the optical pickup 4, and an optical pickup transfer section are provided in the optical pickup 4, a spindle motor 5 for rotating the mounted disk, and a limit switch 13 for determining an initial position of the optical pickup 4.

The components of the conventional optical pickup transfer control device are an optical pick-up conveying section composed of a motor 10, a gear section 8, a guide rail 7, a rak 11 and a sliding section 12 provided on a deck plate, A motor control unit provided on a separate circuit board for controlling the driving of the motor 10, and a central processing unit for applying a control signal to the motor control unit.

The rotation shaft 10a of the motor 10, the first gear 8a, the second gear 8b, the third gear 8c and the fourth gear 8d are engaged with each other, and the optical pick- The slide unit 12 is coupled to a slider 12 that slides along a guide rail 7 mounted on the plate 2. The slide unit 12 is a gear, And is coupled with the leek (11).

With this configuration, the rotational motion transmitted by the motor 10 is converted into linear motion by the lak 11, and as a result, the optical pickup 4 fixed to the lak 11 is guided by the guide rail 7 . Therefore, the optical pickup can linearly reciprocate within a certain distance along the guide rails.

A signal for causing the tray to be taken out of the main body for accommodating the disk is inputted to the central processing unit or the disk read command The optical pickup 4 must be positioned at the innermost peripheral position of the optical disc 4, that is, at the initial position adjacent to the turntable 3, before the disc reading is performed.

As a means for judging that the optical pickup 4 has reached the initial position, the limit switch 13 is provided at a position on the deck plate 2 corresponding to the initial position. When the limit switch 13 is turned on by the contact of the optical pickup 4 transported along the guide rail 7, the on signal is transmitted to the motor control unit, and the driving of the motor 10 is then stopped. However, since the limit switch 13 provided on the deck plate 2 has to be connected to a circuit board separately provided in the main body, it is disadvantageous in that it is difficult to assemble and manufacture.

On the other hand, a method of using a Hall sensor for monitoring the rotation of the motor 10 and outputting a pulse proportional to the rotation can be used. However, since the Hall sensor is also required to be installed in the deck plate 2, There is a drawback that it raises the price of the product.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems described above, and it is an object of the present invention to provide an optical pickup transfer control device which is constructed so that means for determining that the optical pickup is in the set initial position is provided on a circuit board of the main body, The purpose is to provide.

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

Fig. 2 is a partially exploded rear view of Fig. 1,

3 is a plan view showing 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 constituting an optical pickup transfer control device provided in the main body of the optical disc drive.

DESCRIPTION OF THE REFERENCE NUMERALS

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 portion 10, 30; motor

11, 31: rack 12, 32: sliding portion

13: Limit switch 40: Motor control section

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

43: resistance element 44, 45: transistor

46: Servo signal processor

In order to accomplish the above object, an optical pickup transfer control apparatus according to the present invention includes: an optical pickup transferring part having a gear part for linearly reciprocating the optical pickup and a motor for supplying power to the squeezing gear part; A motor control unit for controlling driving of the motor; A central processing unit for applying a control signal for controlling the driving of the motor to the motor control unit; And an optical pickup incident detection means for detecting a drive current supplied to the motor and outputting an incident signal indicating that the optical pickup has reached a position where the optical pickup can no longer advance, .

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

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

The optical pickup transfer control device includes an optical pickup transfer unit having a motor 30 and a gear structure for transmitting the rotational motion of the motor 30 to the optical pickup 24, A central processing unit 41 for applying a control signal to the motor control unit 40 and an optical pickup unit 24 for detecting that the optical pickup 24 has reached an initial set position, And an optical pickup incident detection means (42) for outputting it to the processing section.

The optical pickup transfer section is broadly divided into a motor 30 as a driving means, a gear portion 28, a guide rail 27, a rack 31 and a sliding portion 32 on a deck plate 22. Here, the deck plate 22 is coupled and supported by a deck frame rotatably mounted on a main body (not shown) and a cushioning member having an elastic force. The turn table 23 on which the disc is seated is mounted on the deck plate 22, And a spindle motor 25 for rotating the mounted disk. The rotary shaft 30a of the motor 30, 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 in the optical pick- The optical pickup 24 is coupled to a sliding portion 32 which is slid along a guide rail 27 mounted on a deck plate 22 and the sliding portion 32 converts the rotational motion to a linear motion And is coupled to a gear lever 31 serving as a gear.

The rotary motion transmitted by the motor 30 is converted into a rectilinear motion by the lak 31 and as a result the optical pickup 24 connected to the lak 31 is moved along the guide rail 27 Lt; / RTI > Therefore, the optical pickup 24 is movable along the guide rail 27 within a certain range.

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

The optical pickup incident detection means 42 is provided on a power supply line from the power supply unit to the motor 30 and monitors the drive current supplied to the motor 30 to determine completion of the optical pickup 24 transportation. In the illustrated method, a resistance element 43 is connected to a line extending from a power supply unit to the motor 30. When a voltage variation across the resistance element 43 reaches a predetermined level or more, a high level signal is supplied to the central processing unit 41, The two transistors 44 and 45 are stepped up.

The resistance value of the resistance element 43 is set such that the transistor 44 is turned on at the current level range supplied to the motor 30 while the optical pickup 24 follows the track of the disk or accesses the predetermined position of the disk it is determined not to turn on but to turn on the transistor 44 in an overcurrent state in which the forward movement of the optical pickup 24 is interrupted.

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 judges the signals inputted from the input device connected to the optical disc player or processes the signal input from the input device. In particular, when the signal inputted from the outside is a signal related to the optical disc reading, The controller 24 outputs a control signal corresponding to a setting signal to wait at the initial position.

The motor control unit 42 controls the rotation speed of the motor 30, the rotation direction thereof, and the driving of the motor 30 in accordance with the input signal.

The optical pickup transfer control apparatus constructed as above operates as follows.

First, a signal to eject the tray from the outside to the outside of the main body from the outside to the outside of the main body for accommodating the disk is inputted to the central processing unit 41, or when the disk is already aligned at the reading position on the turn table 23, The central processing unit 41 applies to the motor control unit 40 a control signal corresponding to an instruction to wait the optical pickup 24 in the initial position state. The motor control unit 40 determines the rotational direction of the motor 30 so that the optical pickup 24 advances in the direction in which the turntable 23 is positioned and supplies power to the motor 30 according to the applied control signal. The optical pickup 24 is advanced toward the spindle motor 25 along the guide rail 27 by the rotation of the motor 30 and reaches the end of the spindle motor 25 or the guide rail 27, . At this time, an 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. The central processing unit 41 applies a control signal to the motor control unit 40 indicating that the optical pickup 24 has reached the initial position so that the motor 30 is driven by the braking of the motor control unit 40 Stopped.

Thereafter, the motor control unit 40 reads out the optical signal picked up from the optical pickup 24 and outputs the control signal to the servo signal processor 46, which is provided for controlling the feeding of the optical pickup 24, And adjusts the driving of the motor 30 accordingly.

The optical pickup detection means 42 for monitoring the current supplied to the motor 30 for driving the optical pickup 24 and determining that the optical pickup 24 has reached the set initial position, It is easy to manufacture.

As described above, since the optical pickup transfer control device according to the present invention is provided, it is possible to judge whether or not the optical pickup is transferred to the initial position on the main circuit board, and to easily design and assemble the system according to the omission of the electrical wiring. Do.

Claims (1)

An optical pickup transferring part having a gear part for linearly reciprocating the optical pickup and a motor for supplying power to the squeezing gear part; A motor control unit for controlling driving of the motor; A central processing unit for applying a control signal for controlling the driving of the motor to the motor control unit; And an optical pickup incident detection means for detecting a drive current supplied to the motor and outputting an incident signal indicating that the optical pickup has reached a position where the optical pickup can no longer advance, And the optical pickup is moved in the optical pickup.