KR0148167B1 - Optical pick-up position control device and its method - Google Patents

Abstract

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an optical pickup position control apparatus and a method thereof, wherein a switching member 12 provided on an optical pickup transfer path 4 is switched by the optical pickup 2 during the transfer of the optical pickup 2. Is set as a reference starting position of the optical pickup 2, and the optical pickup driving unit for transferring the optical pickup 2 to the reading position of the lead-in area for each disc type based on the starting position of the optical pickup 2 ( The rotation speed data of the optical pickup transfer motor (M) of 20) is tabulated in the ROM table 16 of the control apparatus 14 as optical pickup position control data, and the control apparatus 14 is determined according to the disc type discrimination result. Outputs optical pickup position control data for positioning the optical pickup 2 from the ROM table 16 to a read position of the lead-in area of the disc, and performs analog conversion on the data conversion unit 18, followed by analog conversion. By controlling the rotation speed of the optical pickup transfer motor (M) of (20) A reading position of the lead-in area of the disk is determined to be adapted to control the position of the optical pick-up (2).

Description

Start position control device and method for optical pickup

1 is a schematic diagram illustrating a position control method of an optical pickup according to a disc type employed in a general multi disc playback system.

2 is a schematic diagram illustrating a start position control method of an optical pickup according to the type of disc in the start position control apparatus of the optical pickup according to the present invention.

3 is a block diagram for explaining a configuration of an optical pickup control device unit included in the start position control apparatus for optical pickup according to the present invention;

4 is a flowchart for explaining the operation of the start position control apparatus for optical pickup according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Spindle Motor 2: Optical Pickup

10: optical pickup control unit 12: switching member

14 controller 16 ROM table

18: data conversion unit 20: optical pickup drive unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a start position control apparatus and method for an optical pickup, and more particularly, to a multi disc playback system capable of playing a plurality of types of discs. The present invention relates to an optical pickup starting position control device and a method for controlling an optical pickup in accordance with the type of a disc so as to be controlled appropriately based on the rotation speed table of the optical pickup transfer motor.

For example, a so-called 'multi disc playback system' capable of selectively playing a compact disc (CD) including audio information or a compact disc video (CDV) including video information and a laser disc (LD) including audio information and video information. In addition, a disc tray capable of mounting a plurality of types of discs is provided, and optical pickup is employed to read video information and / or audio information recorded on a disc to be reproduced mounted on the disc tray or more.

On the inner circumferential side of such various kinds of discs, a lead-in area containing disc information referred to for reading video information and / or audio information recorded on the disc by optical pickup is set. During playback of a particular disc, the disc information recorded in the lead-in area as its starting position is read out, and then access to the target position on the disc is performed.

Here, in the case of a compact disc (CD), its lead-in area is maintained at approximately 28.2 mm from the axis of the spindle motor, and in the case of compact disc video (CDV), the video portion is approximately 40.6 mm from the axis of the spindle motor. In the case of a laser disk, a distance of approximately 56.3 mm is maintained from the axis of the spindle motor.

Therefore, in the optical pickup employed in the multi-disc playback system, position control for reading the disc information according to the type of the disc loaded and loaded in the disc tray must be performed. According to an example of the position control method of the optical pickup according to such a disk type, as shown in FIG. 1, the axis A of the spindle motor 1 which rotates the disk D mounted on the disk tray (not shown) at constant speed is shown. A plurality of switching elements (5) at positions corresponding to the lead-in area of each disc, on the optical pickup transfer device (4) provided on the base member (3) to provide a transfer path of the optical pickup (2) from the center of And 6, 7 are known so as to perform position control of the optical pickup 2 with respect to the disc.

That is, according to an example of the position control method of the optical pickup shown in FIG. 1, a compact is provided at a point a approximately 28.2 mm from the center of the axis A of the spindle motor 1 which drives the disk D at constant speed. A switching element 6 for detecting the lead-in area of the disc is provided, and a switching element 5 for detecting the video portion of the compact disc video at a point b approximately 40.6 mm from the center of the axis A thereof. Is provided, and a switching element 7 for detecting the lead-in area of the laser disk is provided at a point c approximately 56.3 mm from the center of the axis A of the spindle motor 1.

Therefore, the switching from each switching element 5, 6, 7 is performed while determining the type of the disk D to be mounted on the disk tray or higher and transferring the optical pickup 2 according to the determined type of the disk D. Based on the signal, control is performed to position the optical pickup 2 in the lead-in area of the disc mounted on the disc tray or more.

By the way, according to an example of the conventional optical pickup position control method shown in FIG. 1, the plurality of switching elements 5 are located at the position of the lead-in area of each disc according to the type of disc that can be mounted on the disc tray of the multi disc playback system. , 6, 7 correspondingly installed to perform position control of the optical pick-up 2, and thus a multi-step signal processing process is carried out based on switching signals obtained from the plurality of switching elements 5, 6, 7; It is disadvantageous that the overall structure of the positional control of the optical pickup according to the type of the disk is complicated, and the operation for controlling the position of the optical pickup by taking signals from the plurality of switching elements is cumbersome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described prior art, and is a single switching member for setting a reference starting position for a plurality of disks in a transport path of an optical pickup in a multi-disc playback system capable of playing a plurality of disks. While setting the start position control data of the optical pickup for positioning the optical pickup to the lead-in area according to the type of disk, and moving the optical pickup to the installation position of the switching member, the starting position of the tabled optical pickup. It is an object of the present invention to provide an optical pickup starting position control apparatus and a method for controlling the starting position of an optical pickup according to the type of disc based on the control data.

In order to achieve the above object, according to a preferred aspect of the present invention, optical pickups are selectively positioned in the lead-in area by means of optical pickup driving means for a plurality of types of discs each having a lead-in area defined therein. A multi-disc playback system, comprising: one switching member provided on an optical pickup transfer path for providing a reference starting position signal of the optical pickup; Control means for receiving a reference starting position signal of the optical pickup from the switching member and outputting control data for positioning the optical pickup to a lead-in area for each disk based on a disc type discrimination signal; Analog conversion of the start position control data of the optical pickup for the corresponding disk output from the control means is applied to the optical pickup driving means as a positioning control signal of the optical pickup to the lead-in area of the disc determined by the type. And a data conversion means configured to transfer the pickup. The control means includes a ROM table in which control data for positioning the optical pickup is positioned in a lead-in area of each disc according to the type of disc. A starting position control device for an optical pickup is provided.

Preferably, the position control data table of the optical pickup is data for controlling the number of rotations of the optical pickup transfer motor for positioning the optical pickup to the lead-in area of the disc of different types based on the installation position of the switching member. Is created.

According to another preferred aspect of the present invention, a method of calculating optical pickup position control data for positioning an optical pickup into a lead-in area of a plurality of types of discs that can be reproduced in a multi-disc reproduction system, and the reference detected during the transfer of the optical pickup. Outputting position control data of the optical pickup corresponding to the type of the disc when the optical pickup start position signal is detected, and converting the position control data of the optical pickup outputted corresponding to the type of the disc, the data conversion step Starting position control of the optical pickup, comprising performing position control of the optical pickup from the reference optical pickup starting position to a position of a lead-in area according to the type of the disc, based on an analog converted position control signal; A method is provided.

Preferably, the position control data of the optical pickup includes data for position control of the optical pickup in each lead-in area of the plurality of types of disks, and the tables are different from each other based on the installation position of the switching member. And rotation speed control data of the optical pickup transfer motor for positioning the optical pickup into the lead-in area of the disc.

According to the start position control apparatus and method of the optical pickup according to the present invention configured as described above, there is provided a single switching member for providing a reference starting position signal for the start positioning of the optical pickup on the transfer path of the optical pickup. When the start position signal of the optical pickup is detected from the switching member, the optical pickup can be positioned in the lead-in area of the disk by controlling the rotation speed of the optical pickup transfer motor with reference to the disc type determination signal.

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

2 is a schematic diagram for explaining the start positioning method of the optical pickup according to the present invention, which is employed in a multi-disc reproduction system capable of selectively reproducing a plurality of types of discs and controls the optical pickup control unit 10 described later. A predetermined point on the feed path 4 of the optical pickup 2 from the center of the axis A of the spindle motor 1 which rotates the disk under constant speed (in the present invention, corresponds to the video portion of the compact disc video CDV). A single switching member 12 is provided at the side to obtain a switching signal indicating a reference starting position of the optical pickup 2. The switching member 12 is configured such that the optical pickup 2 receives light in a state in which the disk D rotates at a predetermined speed as the spindle motor 1 rotates at a constant speed, for example, under the control of the optical pickup control unit 10. The optical pickup 2 causes the switching member 12 to move in the direction of the inner diameter of the disk D in order to read the lead-in area of the disk D from the standby position by the pickup transfer motor M. When connected, it outputs a reference starting position signal (i.e., in the present invention, the starting position for the CDV disc is set as a reference), so that the optical pickup control unit 10 provides an installation point of the switching member 12. Is a reference starting position of the optical pickup 2, stops the optical pickup 2, and then discriminates a signal of the disc type applied from the outside, that is, the disk D is a compact disc, a compact disc video or a laser disc. Disc type indicating presence The optical pickup 2 controlled to the current reference position (installation position of the switching member; b) in accordance with the type discrimination signal is moved to the position of the lead-in area of the corresponding disc D based on the disc type discrimination signal. do.

Here, the type of disc is adopted in a multi-disc reproducing system, as is well known, and the disc tray has a structure capable of mounting a plurality of types of discs. The difference in weight according to the dimensions can be detected and determined.

3 is a block diagram of the optical pickup control unit included in the start position control apparatus of the optical pickup according to the present invention. Reference numeral 12 denotes a transfer path of the optical pickup 2 as described with reference to FIG. In the present invention, in the present invention, a switching member is provided at a position (b) for reading a video portion of a compact disc video (CDV) and provides a reference position signal of the optical pickup (2). In order to read the lead-in area according to the type of disk from the standby position, switching is connected while moving in the inner diameter direction of the disk to generate a reference starting position signal of the optical pickup 2.

Reference numeral 14 denotes that the optical pickup 2 of the switching member 12 receives the start position signal of the optical pickup 2 generated by switching connection from the switching member 12 during the transfer of the optical pickup 2. The optical pickup 2 is moved forward from the standard starting position in the inner diameter direction in the case of a compact disc on the basis of the control at the installation position, that is, the reference starting position b, and the disc type discrimination signal applied from the outside. As a means for performing the control (refer to the lead-in area 'a' of the compact disc in FIGS. 1 and 2) or the reverse of the laser disc (see the lead-in area 'c' in the laser disc in FIGS. 1 and 2) in the case of a laser disc. Indicates a control device.

According to the present invention, when the switching signal is input by the switching member 12 provided on the transport path of the optical pickup 2 in the control device 14, the disc type discrimination signal is input from the outside. The ROM table 16 is provided in which data for position control such as forward or backward of the optical pickup 2 is tabled according to the type of disk from the starting position of the optical pickup 2 provided with the switching member 12. do. Preferably, the ROM table 16 reads a read position a of the lead-in area of the compact disc, for example, from the reference starting position b of the optical pickup 2 provided with the switching member 12 shown in FIG. Lead-in of a laser disk, for example, from data obtained by experimentally calculating the number of revolutions of the optical pickup transfer motor M for moving the optical pickup 2 to the reference position and the standard starting position b of the optical pickup 2; The data obtained by experimentally calculating the number of revolutions of the optical pickup transfer motor M for moving the optical pickup 2 to the area c is prepared as a table.

In Fig. 3, reference numeral 18 denotes, for example, a digital-analog converter for analog-converting the position control data of the optical pickup 2 output from the ROM table 16 of the control device 14 according to the type of the disc. A data conversion unit is constructed, and reference numeral 20 denotes the positioning of the optical pickup 2 according to the type of disc on the basis of the position control data of the optical pickup 2 analog-converted by the data conversion unit 18. As an optical pickup driving unit, an optical pickup transfer motor for transferring an optical pickup position control data output from the ROM table 16 according to the type of a disc, that is, the optical pickup 2 according to the rotational speed data of the optical pickup transfer motor M; Will drive (M).

Next, the operation of the optical pickup position control apparatus according to the present invention configured as described above will be described with reference to the flowchart shown in FIG.

First, in step 41, the mounting position of the switching member 12 is considered as the starting position of the optical pickup 2, and the reading position of the lead-in area of the compact disc is determined from the reference starting position b of the optical pickup 2; Optical pickup (2) from the rotational speed data of the optical pickup transfer motor (M) necessary for the movement to a) and the starting position (b) of the optical pickup (2) to the reading position (c) of the lead-in area of the laser disc. The rotational speed data of the optical pickup motor (M) for conveying the pressure is experimentally calculated and tabulated as optical pickup position control data.

After the table for such optical pickup position control data is created, a determination is made as to the type of the disc mounted on the disc tray or above in step 42. In step 43, the spindle motor 1 is driven to drive the disc D. Control to rotate at constant speed.

When the disk D rotates at a constant speed, the optical pickup 2 is transferred from the standby position in the inner diameter direction of the disk D in step 44, and the switching member in step 45 during the transfer of the optical pickup 2 is carried out. When the 12 is connected, the optical pickup 2 stops at the installation position of the switching member 12 under the control of the control device 14, and then the control device 14 at step 45 receives the optical pickup 2 If it is determined that the switching member 12 is connected during transfer, the process proceeds to step 46, and the disk D mounted on the current disk tray or more is selected according to the disc type discrimination performed in step 42, for example. In the case of a compact disc, the position control data of the optical pickup 2 for the compact disc created in the ROM table 16 is output.

On the other hand, in the case where the type of the disc D currently mounted on the disc tray is a laser disc, the control device 14 receives the position control data of the optical pickup 2 with respect to the laser disc created in the ROM table 16. When the disc currently mounted in the disc tray is a compact disc video (CDV), the optical pickup position control data for reading the disc information from the standby position of the current optical pickup 2 is outputted.

In step 47, the position control data of the optical pickup 2 outputted from the control device 14 is converted into analog data by the data conversion unit 18, and then in step 48, the position control of the analog converted optical pickup 2 is performed. On the basis of the data, position control of the optical pickup 2 is performed in accordance with the type of the disc. That is, in the case of a compact disc, the position control data of the optical pickup 2 with respect to the compact disc output from the ROM table 16 of the control device 14, that is, the reference starting position b of the optical pickup 2 The rotation speed data of the optical pickup transfer motor M for transferring the optical pickup 2 to the read position a of the lead-in area of the compact disc is output, whereas in the case of a laser disc, the control device 14 Position control data of the optical pickup 2 with respect to the laser disk output from the ROM table 16, i.e., from the start position b of the optical pickup 2 to the read position c of the lead-in area of the laser disk. The rotation speed data of the optical pickup transfer motor M for transferring the pickup 2 is output as optical pickup position control data, and the optical pickup position control data is analog-converted by the data converting unit 18 and then the optical pickup driving unit. Optical pick-up transfer motor applied according to the type of disc Since the rotation speed of M is controlled, the optical pickup 2 can be quickly transferred from the starting position to the reading position of the lead-in area of each disk D. FIG.

As described above, according to the start position control apparatus and method of the optical pickup according to the present invention, a single switching member for detecting the start position of the optical pickup is provided on the transfer path of the optical pickup while According to the disc type, the optical pickup position control data for transferring the optical pickup to the position of the lead-in area for each disc type is tabled with the rotation speed data of the optical pickup transfer motor, and the optical pickup transfer is performed based on the disc type discrimination result. By controlling the rotation speed of the motor, it is possible to quickly transfer the optical pickup to the read position of the lead-in area according to the type of disk.

Claims (5)

In a multi-disc reproducing system in which a plurality of types of discs each having a lead-in area defined therein are optically picked up by means of the optical pickup driving means 20 to be selectively positioned in the lead-in area, and selectively reproduced. A switching member (12) mounted on the transport path (4) for providing a reference starting position signal of the optical pickup (2); For receiving the reference starting position signal of the optical pickup 2 from the switching member 12 and positioning the optical pickup 2 in the lead-in area for each disk based on a disc type discrimination signal; Control means 14 for outputting control data; Analog conversion of the start position control data of the optical pickup 2 for the disc output from the control means 14 is applied to the optical pickup driving means 20 as a positioning control signal of the optical pickup 2, And a data converting means 18 for transferring the optical pickup 2 to the lead-in area of the disc of the type discrimination, wherein the control means 14 has lead-in of each disc according to the type of disc. And a ROM table (16) in which position control data for position control of the optical pickup (2) is provided in an area. The optical pickup according to claim 1, wherein the position control data of the optical pickup (2) is used to position the optical pickup (2) into lead-in areas of different types of discs based on the installation position of the switching member (12). A starting position control apparatus for an optical pickup, characterized in that it is made of data for controlling the rotation speed of the feed motor (M). Creating optical pickup position control data for positioning the optical pickup into a lead-in area of a plurality of types of discs that can be reproduced in the multi-disc reproduction system; Outputting position control data of the optical pickup corresponding to the type of the disc upon detection of the reference optical pickup starting position signal set corresponding to the lead-in area of the specific disk during the transfer of the optical pickup; A data conversion step of analog converting the position control data of the optical pickup output in correspondence with the type of the disc; And performing position control of the optical pickup from the reference optical pickup starting position to a position of a lead-in area according to the type of the disc based on the position control signal of the analog-converted optical pickup. Starting position control method of pickup. 4. The start position control method according to claim 3, wherein the optical pickup starting position signal is obtained from one switching member which is provided on a transfer path of the optical pickup and is switched to be connected during the transfer of the optical pickup. 5. The optical pickup transfer motor according to claim 3 or 4, wherein the position control data table of the optical pick-up is configured to control the optical pickup to the lead-in area of different types of discs based on the installation position of the switching member. A start position control method for an optical pickup, comprising rotation speed control data.